Gas two-way metering and pressure regulating device

Abstract

The present application relates to gas delivery technical field, specifically to a kind of gas two-way metering pressure regulating device, including pressure regulating cabinet, import pipe, export pipe, bypass system and pressure regulating system, the import of pressure regulator is communicated with pressure regulating pipe by heat exchange pipe, heat exchanger is equipped on heat exchange pipe, the heat exchanger includes heat exchange cylinder, circulating heat pump, circulating pipe and heat source box, pressure regulating pipe is fixed in heat exchange cylinder wall, heat exchange cylinder is sleeved and fixed in heat exchange pipe outside and the cavity for heat exchange medium circulation is formed between its inner and outer wall, circulating pipe is in series with heat exchange cylinder, circulating heat pump and heat source box in turn, variable diameter mechanism capable of changing the size of cavity circulation cross section is provided in heat exchange cylinder.Therefore, not only can the deicing efficiency of pressure regulator be improved, but also the energy consumption can be effectively reduced, and the present application integrates pressure regulating, filtering, overpressure / pressure loss cut-off, metering, safety dispersion and the like, with good system coordination, safety and reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of gas transportation and relates to a gas bidirectional metering and pressure regulating device. Background Art

[0002] Based on the Joule-Thomson effect, natural gas typically experiences a temperature drop during adiabatic throttling and expansion. Generally, for every 0.2-0.3 MPa drop in pressure, the temperature drops by approximately 1°C. Especially in winter, if the temperature at the regulator outlet drops sharply by more than 12°C, and the regulator temperature is below 10°C, the regulator outlet temperature will drop below -2°C. Furthermore, due to the small diameter of the regulator's conduit or valve port, and the presence of moisture and impurities in the natural gas, once the valve port freezes, it can cause a series of problems, including regulator malfunction and the entry of high-pressure natural gas into the downstream pipeline. To ensure gas safety, existing technologies often employ heat exchangers, pilots, and pipeline electric heating to increase the temperature of the natural gas at the local regulator inlet to ensure smooth regulator operation.

[0003] However, the above-mentioned prior art has the problems of low deicing efficiency and poor safety. In addition, there is also the problem of being unable to adaptively adjust according to seasonal temperature differences, thereby resulting in high energy consumption. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems in the existing technology and to propose a gas bidirectional metering and pressure regulating device.

[0005] The purpose of the present invention can be achieved through the following technical solutions: a gas bidirectional metering pressure regulating device, including a pressure regulating cabinet, an inlet pipe, an outlet pipe, a bypass system and a pressure regulating system, the bypass system includes a bypass pipe and a bypass valve and a manual regulating valve sequentially arranged on the bypass pipe, the two ends of the bypass pipe are respectively connected to the inlet pipe and the outlet pipe, the pressure regulating system includes a pressure regulating pipe and an inlet valve, a gas filter, a safety shut-off valve, a pressure regulator, and an outlet valve sequentially arranged on the pressure regulating pipe, a drain valve is connected to the gas filter, the bypass pipe and the pressure regulating pipe are connected in parallel, the regulating The inlet of the compressor is connected to the pressure regulating pipe through a heat exchange pipe. A heat exchanger is provided on the heat exchange pipe. The heat exchanger includes a heat exchange cylinder, a circulating heat pump, a circulating pipe and a heat source box that stores heat exchange medium and can heat the heat exchange medium. End covers are sealed and fixed at both ends of the heat exchange cylinder. The pressure regulating pipe is passed through and fixed on the wall of the heat exchange cylinder. The heat exchange cylinder is sleeved and fixed on the outside of the heat exchange tube, and a cavity for the circulation of heat exchange medium is formed between the inner and outer walls of the two. The circulating pipe connects the heat exchange cylinder, the circulating heat pump and the heat source box in series in sequence. A diameter-changing mechanism that can change the size of the cavity flow cross-section is provided in the heat exchange cylinder.

[0006] Preferably, the outer wall of the heat exchange tube is evenly spread out with a number of ridges in the circumferential direction, and slide grooves are formed between the ridges. The diameter-changing mechanism includes a slide rod and a slide cylinder. The slide cylinder is slidably penetrated on the end cover, and the slide cylinder is sleeved outside the slide rod and slidably cooperates with it. The slide rod and the inner end of the slide cylinder are fixedly connected with a hydraulic cylinder that can push them forward and backward respectively. The hydraulic cylinder is fixed in the pressure regulating cabinet. The inner end of the slide rod is circumferentially spread out with a number of first slide arms, and the inner end of the slide cylinder is circumferentially spread out with a number of second slide arms. The first slide arm and the second slide arm are staggered and slidably embedded in the slide groove. The lower ends of the first slide arm and the second slide arm are hinged with variable diameter blocks through connecting rods. The two side surfaces of the several variable diameter blocks can be completely fitted with each other, and the inner wall of the heat exchange tube has a variable diameter ring groove bulging out to the four sides for the variable diameter blocks to be inserted into.

[0007] Preferably, the cross-section of the reducing block is trapezoidal or triangular, and the reducing block is made of elastic material.

[0008] Preferably, the circulating heat pump and the heat source box are both arranged outside the voltage regulating cabinet.

[0009] Preferably, an insulating joint is provided at the outlet of the inlet pipe and the outlet pipe.

[0010] Preferably, an outlet pressure gauge is provided on the pressure regulating pipe between the pressure regulator and the outlet valve.

[0011] Preferably, the inlet pipe and the outlet pipe are provided with a bidirectional meter.

[0012] Preferably, the pressure regulating system is one-way or two-way.

[0013] Preferably, a pressure differential pipe is connected in parallel to the pressure regulating pipes at both ends of the gas filter, two front and rear pressure differential valves are provided on the pressure differential pipe, and a pressure differential gauge is provided on the pressure differential pipe between the two front and rear pressure differential valves.

[0014] Preferably, a safety relief valve is provided on the outlet pipe.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. It integrates pressure regulation, filtration, overpressure / underpressure cut-off, metering, and safety relief, with good system coordination and high reliability;

[0017] 2. There is no electric heating for deicing in the voltage regulating cabinet, and the circulating heat pump and heat source box are located outside the voltage regulating cabinet, which is safer. At the same time, the heat exchange medium is directly attached to the pipeline and the voltage regulator outlet to improve the heat exchange efficiency.

[0018] 3. The heat exchange mode is changed according to the seasonal temperature difference through the variable diameter mechanism, and the adjustment is made adaptively, which greatly reduces energy consumption;

[0019] 4. Simple installation and debugging, easy use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the internal structure of the voltage regulating cabinet.

[0021] Figure 2 It is a schematic diagram of the system flow structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the connection structure of the reducing mechanism.

[0023] Figure 4 It is a schematic diagram of the disassembled structure of the heat exchange tube and the reducing mechanism.

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the heat exchange tube.

[0025] In the figure, 1. pressure regulating cabinet; 2. inlet pipe; 21. insulation joint; 22. two-way meter; 3. outlet pipe; 4. bypass system; 41. bypass pipe; 42. bypass valve; 43. manual regulating valve; 5. pressure regulating system; 51. pressure regulating pipe; 52. inlet valve; 53. gas filter; 531. drain valve; 532. differential pressure pipe; 533. front and rear differential pressure valve; 534. differential pressure gauge; 54. safety shut-off valve; 55. pressure regulator; 56. outlet valve; 5 7. Outlet pressure gauge; 6. Heat exchange tube; 61. Ridge; 62. Slide; 7. Heat exchanger; 71. Heat exchange cylinder; 711. End cover; 712. Variable diameter ring groove; 72. Circulating heat pump; 73. Circulating tube; 74. Heat exchange medium; 75. Heat source box; 76. Cavity; 8. Variable diameter mechanism; 81. Slide rod; 811. First slide arm; 82. Slide cylinder; 821. Second slide arm; 83. Hydraulic cylinder; 84. Connecting rod; 85. Variable diameter block; 9. Safety relief valve. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1-5As shown, a gas bidirectional metering pressure regulating device includes a pressure regulating cabinet 1, an inlet pipe 2, an outlet pipe 3, a bypass system 4 and a pressure regulating system 5. The bypass system 4 includes a bypass pipe 41 and a bypass valve 42 and a manual regulating valve 43 sequentially arranged on the bypass pipe 41. The two ends of the bypass pipe 41 are respectively connected to the inlet pipe 2 and the outlet pipe 3. The pressure regulating system 5 includes a pressure regulating pipe 51 and an inlet valve 52, a gas filter 53, a safety shut-off valve 54, a pressure regulator 55, and an outlet valve 56 sequentially arranged on the pressure regulating pipe 51. The gas filter 53 is connected to a drain valve 531. The bypass pipe 41 is connected in parallel with the pressure regulating pipe 51. The inlet of the pressure regulator 55 is connected by a switch. The heat pipe 6 is connected to the pressure regulating pipe 51, and a heat exchanger 7 is provided on the heat exchange pipe 6. The heat exchanger 7 includes a heat exchange tube 71, a circulating heat pump 72, a circulating pipe 73 and a heat source box 75 that stores a heat exchange medium 74 and can heat the heat exchange medium 74. End covers 711 are sealed and fixed at both ends of the heat exchange tube 71. The pressure regulating pipe 51 is passed through and fixed on the wall of the heat exchange tube 71. The heat exchange tube 71 is sleeved and fixed on the outside of the heat exchange tube 6, and a cavity 76 for the heat exchange medium 74 to circulate is formed between the inner and outer walls of the two. The circulating pipe 73 connects the heat exchange tube 71, the circulating heat pump 72 and the heat source box 75 in series in sequence. A diameter-changing mechanism 8 that can change the flow cross-section size of the cavity 76 is provided in the heat exchange tube 71.

[0028] The outer wall of the heat exchange tube 6 is evenly spread out with a number of ridges 61 in the circumferential direction, and a slide groove 62 is formed between the ridges 61. The diameter-changing mechanism 8 includes a slide rod 81 and a slide cylinder 82. The slide cylinder 82 is slidably penetrated on the end cover 711. The slide cylinder 82 is sleeved on the outside of the slide rod 81 and slides with it. The inner ends of the slide rod 81 and the slide cylinder 82 are fixedly connected with a hydraulic cylinder 83 that can push them forward and backward respectively. The hydraulic cylinder 83 is fixed in the pressure regulating cabinet 1. The inner end of the slide rod 81 is circumferentially spread out with a plurality of ridges 61. A plurality of first sliding arms 811 and a plurality of second sliding arms 821 are circumferentially extended on the inner end of the slide tube 82. The first sliding arms 811 and the second sliding arms 821 slide and are inserted into the slide groove 62 in an interlaced manner. The lower ends of the first sliding arms 811 and the second sliding arms 821 are hinged with reducing blocks 85 through connecting rods 84. The two side surfaces of the plurality of reducing blocks 85 can be completely fitted with each other. The inner wall of the heat exchange tube 71 has a reducing ring groove 712 bulging outwards to allow the reducing blocks 85 to be inserted. Example

[0029] When it is winter, the outlet temperature of the voltage regulator will drop below -2°C. At this time, the heat source box 75 heats the heat exchange medium 74 to 70-90°C, and the hydraulic cylinder 83 is started to drive the slide 82 and the slide rod 81 to move inward, so that the first slide arm 811 and the second slide arm 821 slide inward along the slide groove 62, thereby driving the connecting rod 84 to retract the reducing block 85 inward. At this time, the side surfaces of the reducing block 85 on the first slide arm 811 and the second slide arm 821 fit together to form two small circular rings in the front and rear positions. At this time, the flow cross-section of the cavity 76 becomes smaller, but the flow rate of the heat exchange medium 74 becomes larger. The temperature of the heat exchange medium 74 flowing back to the heat source box 75 through the circulating heat pump 72 is 60-70°C, thereby achieving an improvement in heat exchange efficiency and improving de-icing efficiency. Example

[0030] When it is summer, the indoor and outdoor temperatures are maintained between 20-40°C. According to the principle of Joule-Thomson effect, the lowest temperature at the outlet of the voltage regulator 55 will not be lower than 0°C. At this time, the heat source box 75 heats the heat exchange medium 74 to 60-80°C, and starts the hydraulic cylinder 83 to drive the slide 82 and the slide rod 81 to move outward, so that the first slide arm 811 and the second slide arm 821 slide outward along the slide groove 62, thereby driving the connecting rod 84 to push the reducing block 85 outward to form a circular ring with side surfaces that fit each other, and the circular ring is embedded in the reducing ring groove 712. At this time, the flow cross-section of the cavity 76 becomes larger, but the flow rate of the heat exchange medium 74 becomes smaller, and the residence time in the cavity 76 is also increased. In addition, the temperature in the cavity 76 is high in summer and it is not easy to dissipate and continuous heat exchange is not required. The temperature of the heat exchange medium 74 flowing back to the heat source box 75 through the circulating heat pump 72 is 55-65°C, which effectively reduces energy consumption.

[0031] Furthermore, if Figure 4 As shown, the cross-section of the reducing block 85 is trapezoidal or triangular, and the reducing block 85 is made of elastic material. The main function of the trapezoidal or triangular cross-section of the reducing block 85 is to improve the wedge fit between the reducing block 85 and the reducing ring groove 712. The reducing block 85 is made of elastic material to enhance the sealing between the reducing block 85 and the reducing ring groove 712 and prevent cavitation between the reducing ring groove 712 and the reducing block 85.

[0032] Furthermore, if Figure 2 As shown, the circulating heat pump 72 and the heat source box 75 are both arranged outside the voltage regulating cabinet 1. This avoids the safety accidents caused by the leaking gas from the electrically connected circulating heat pump 72 and the heat source box 75, thereby ensuring safety.

[0033] An insulating joint 21 is provided at the outlet of the inlet pipe 2 and the outlet pipe 3. The insulating joint 21 is to prevent electric combustion from occurring when the gas inlet pipe 2 and the outlet pipe 3 are installed.

[0034] The pressure regulating system 5 is one-way or two-way.

[0035] An outlet pressure gauge 57 is provided on the pressure regulating pipe 51 between the pressure regulator 55 and the outlet valve 56 .

[0036] The inlet pipe 2 and the outlet pipe 3 are provided with a bidirectional meter 22 .

[0037] A pressure differential pipe 532 is connected in parallel to the pressure regulating pipes 51 at both ends of the gas filter 53 . The pressure differential pipe 532 is provided with two front and rear pressure differential valves 533 . A pressure differential gauge 534 is provided on the pressure differential pipe 532 between the two front and rear pressure differential valves 533 .

[0038] The outlet pipe 3 is provided with a safety relief valve 9. The safety relief valve 9 is suitable for the safe release of high-pressure, medium-pressure and low-pressure gas pipelines. When overpressure occurs, it can automatically open to release overpressure gas, thereby protecting downstream equipment and ensuring safe gas use for users.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A gas bidirectional metering and pressure regulating device, comprising a pressure regulating cabinet (1), an inlet pipe (2), an outlet pipe (3), a bypass system (4) and a pressure regulating system (5), wherein the bypass system (4) comprises a bypass pipe (41) and a bypass valve (42) and a manual regulating valve (43) sequentially arranged on the bypass pipe (41), the two ends of the bypass pipe (41) are respectively connected to the inlet pipe (2) and the outlet pipe (3), the pressure regulating system (5) comprises a pressure regulating pipe (51) and an inlet valve (52), a gas filter (53), a safety shut-off valve (54), a pressure regulator (55), and an outlet valve (56) sequentially arranged on the pressure regulating pipe (51), the gas filter (53) is connected to a drain valve (531), the bypass pipe (41) and the pressure regulating pipe (51) are connected in parallel, and the invention is characterized in that: The inlet of the pressure regulator (55) is connected to the pressure regulating pipe (51) through the heat exchange pipe (6). A heat exchanger (7) is provided on the heat exchange pipe (6). The heat exchanger (7) includes a heat exchange cylinder (71), a circulating heat pump (72), a circulating pipe (73), and a heat source box (75) storing a heat exchange medium (74) and capable of heating the heat exchange medium (74). End caps (711) are sealed and fixed at both ends of the heat exchange cylinder (71). The pressure regulating pipe (51) is passed through and fixed on the wall of the heat exchange cylinder (71). The heat exchange tube (71) is sleeved and fixed on the outside of the heat exchange tube (6), and a cavity (76) for the heat exchange medium (74) to circulate is formed between the inner and outer walls of the two. The circulation tube (73) sequentially connects the heat exchange tube (71), the circulation heat pump (72) and the heat source box (75) in series. A diameter-changing mechanism (8) capable of changing the flow cross-section size of the cavity (76) is provided in the heat exchange tube (71). The outer wall of the heat exchange tube (6) is uniformly spread with a plurality of convex ridges (61) in the circumferential direction, and a sliding groove is formed between the convex ridges (61). The groove (62), the diameter-changing mechanism (8) includes a slide rod (81), a slide cylinder (82), the slide cylinder (82) is slidably mounted on the end cover (711), the slide cylinder (82) is sleeved on the outside of the slide rod (81) and slidably matched therewith, the inner ends of the slide rod (81) and the slide cylinder (82) are fixedly connected with a hydraulic cylinder (83) that can respectively push them to move forward and backward, the hydraulic cylinder (83) is fixed in the pressure regulating cabinet (1), the inner end of the slide rod (81) is circumferentially expanded with a plurality of first slide arms (811), the slide cylinder (8 2) has a plurality of second sliding arms (821) circumferentially extended at the inner end thereof, the first sliding arm (811) and the second sliding arm (821) are staggered and slidably embedded in the sliding groove (62), the lower ends of the first sliding arm (811) and the second sliding arm (821) are hinged with a reducing block (85) through a connecting rod (84), the two side surfaces of the plurality of reducing blocks (85) can be completely fitted with each other, and the inner wall of the heat exchange tube (71) has a reducing ring groove (712) bulging outwards to allow the reducing block (85) to be inserted.

2. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: The cross section of the reducing block (85) is trapezoidal or triangular, and the reducing block (85) is made of elastic material.

3. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: The circulating heat pump (72) and the heat source box (75) are both arranged outside the voltage regulating cabinet (1).

4. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: Insulating joints (21) are provided at the outlets of the inlet pipe (2) and the outlet pipe (3).

5. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: An outlet pressure gauge (57) is provided on the pressure regulating pipe (51) between the pressure regulator (55) and the outlet valve (56).

6. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: A bidirectional meter (22) is provided on the inlet pipe (2) and the outlet pipe (3).

7. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: The pressure regulating system (5) is one-way or two-way.

8. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: A pressure differential tube (532) is connected in parallel to the pressure regulating tubes (51) at both ends of the gas filter (53). The pressure differential tube (532) is provided with two front and rear pressure differential valves (533). A pressure differential gauge (534) is provided on the pressure differential tube (532) between the two pressure differential valves (533).

9. A gas bidirectional metering and pressure regulating device according to claim 1, characterized in that: The outlet pipe (3) is provided with a safety relief valve (9).

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