Parallel fuel gas pressure regulating device

Abstract

The utility model discloses a parallel fuel gas pressure regulating device which comprises a box body, and a first fuel gas conveying branch pipe and a second fuel gas conveying branch pipe which are connected in parallel are arranged in the box body. The first gas conveying branch pipe and the second gas conveying branch pipe are sequentially provided with a filtering device used for filtering impurities, a pressure gauge used for displaying gas pressure and a gas adjusting component used for adjusting the gas pressure in the gas conveying direction, and the first gas conveying branch pipe and the second gas conveying branch pipe are converged to form a gas output header pipe. The fuel gas output header pipe extends out of the box body and then is connected with a downstream fuel gas conveying pipeline, and the two fuel gas adjusting components are communicated through a signal balance pipe. The utility model provides a parallel fuel gas pressure regulating device which can reduce user investment on the premise of stable and safe operation.

Description

Technical Field

[0001] The utility model belongs to the field of gas equipment installation, and in particular relates to a parallel gas pressure regulating device. Background Art

[0002] At present, gas has become an important energy source in people's daily life and production. With the continuous acceleration of urbanization, the application scope and usage of gas are also increasing. Gas pressure regulation occupies an important position in urban gas transmission, among which gas pressure regulating box and pressure regulating cabinet are the main pressure regulating equipment. In the actual application process, due to the limitation of the use site, the pressure regulating cabinet cannot meet the use requirements, and a single pressure regulating box cannot meet the user's use due to the maximum flow limit. At this time, two pressure regulating boxes need to be connected in parallel to meet user needs.

[0003] Now in actual projects, Figure 1 As shown, the outlets of two identical pressure regulating tanks are directly connected by pipes, which is regarded as two pressure regulating tanks in parallel. However, this parallel connection cannot achieve the expected flow rate of twice that of a single pressure regulating tank during actual operation, and this parallel connection often takes a long time to debug the outlet pressure before being put into use, so that the outlet pressures of the two pressure regulating tanks are basically the same. In addition, this parallel connection method is difficult to deal with the following situations:

[0004] 1. Due to the sudden change of gas volume or gas source pressure downstream of the pressure regulating box, the outlet pressure of the pressure regulating box changes accordingly. In this parallel connection mode, the outlet pressure changes of the two pressure regulating boxes will be significantly different, resulting in the two parallel pressure regulating boxes not being able to operate at full load at the same time;

[0005] 2. Since the length of the pipeline from the outlet of a single pressure regulating box to the parallel connection, as well as the materials of pipe fittings, valves, etc., are not exactly the same, the pressure losses of the two sections of the pipeline are different. Even if the outlet pressures are adjusted to be consistent, one of the pipelines will run at an overload and the other will run at a small load. Utility Model Content

[0006] In view of the problems existing in the prior art of directly connecting two pressure regulating boxes in parallel, the utility model provides a parallel gas pressure regulating device, which can reduce user investment under the premise of stable and safe operation.

[0007] The utility model provides a parallel gas pressure regulating device, which comprises a box body, wherein two parallel first gas delivery branch pipes and a second gas delivery branch pipe are arranged in the box body, and a filtering device for filtering impurities, a pressure gauge for displaying gas pressure, and a gas regulating component for regulating gas pressure are arranged on the first gas delivery branch pipe and the second gas delivery branch pipe in sequence along the gas delivery direction, the first gas delivery branch pipe and the second gas delivery branch pipe merge into a gas output main pipe, the gas output main pipe is extended to the outside of the box body and then connected to a downstream gas delivery pipeline, and the two gas regulating components are connected via a signal balance pipe.

[0008] Furthermore, the box body is provided with a gas inlet, which is connected to the gas input main pipe through an inlet flange. The gas input main pipe entering the box body is divided into a first gas delivery branch pipe and a second gas delivery branch pipe after passing through an inlet ball valve.

[0009] Furthermore, the box body is provided with a gas outlet, which is connected to a gas output main pipe via an outlet flange. The gas output main pipe extends out of the box body after passing through an outlet ball valve and is connected to a downstream gas delivery pipeline.

[0010] Furthermore, the first gas delivery branch pipe and the second gas delivery branch pipe are arranged vertically to facilitate the gas regulating components of the first gas delivery branch pipe and the second gas delivery branch pipe to balance the pressure, so that the pressure losses of the first gas delivery branch pipe and the second gas delivery branch pipe are the same.

[0011] Furthermore, the filtering device, the pressure gauge, and the gas regulating component on the first gas transmission branch pipe and the second gas transmission branch pipe are symmetrically arranged.

[0012] Furthermore, the pipeline distance between the confluence point of the first gas transmission branch pipe and the second gas transmission branch pipe and the gas regulating component on the first gas transmission branch pipe is equal to the pipeline distance between the confluence point of the first gas transmission branch pipe and the second gas transmission branch pipe and the gas regulating component on the second gas transmission branch pipe.

[0013] Furthermore, the gas regulating component includes a shell connected to the first gas delivery branch and the second gas delivery branch, a main valve port is provided inside the shell, a pressure regulating part is provided in the shell above the main valve port, a cut-off part is provided in the shell below the main valve port, the left side of the main valve port is the air inlet end of the gas regulating component, and the right side of the main valve port is the air outlet end.

[0014] Furthermore, the pressure regulating part includes a regulating chamber arranged above the main valve port, wherein a regulating diaphragm with an regulating tray is arranged in the regulating chamber, and the regulating diaphragm divides the regulating chamber into an upper regulating chamber and a lower regulating chamber, and an regulating spring, an adjusting nut and an adjusting connecting shaft are arranged in the upper regulating chamber, the adjusting nut is arranged at the upper end of the adjusting connecting shaft, the lower end of the adjusting connecting shaft is connected to the adjusting tray and extends to the lower regulating chamber, and an adjusting connecting rod and an adjusting valve stem are arranged in the lower regulating chamber, the head end of the adjusting connecting rod is connected to the adjusting connecting shaft below the adjusting tray, the tail end of the adjusting connecting rod is connected to the adjusting valve stem, the bottom end of the adjusting valve stem is connected to the regulating valve disc arranged above the main valve port, a relief valve seat is arranged on the adjusting connecting shaft below the regulating diaphragm, a relief hole is arranged on the adjusting tray, the lower regulating chamber is connected to the air outlet end on the right side of the main valve port through a pressure signal tube, and a signal tube regulating valve is arranged on the pressure signal tube.

[0015] Furthermore, the signal balance tube is connected between the two pressure-conducting signal tubes.

[0016] Furthermore, the cut-off part includes a cut-off chamber, a pull rod, a cut-off spring, a cut-off pressure-regulating screw plug, a cut-off diaphragm, a cut-off tray, and a cut-off valve flap; the cut-off chamber is arranged below the main valve port, and the cut-off diaphragm is arranged through the cut-off tray. The cut-off diaphragm divides the cut-off chamber into a left cut-off chamber and a right cut-off chamber. The right cut-off chamber is connected to the air outlet end on the right side of the main valve port, and the cut-off valve flap is arranged at the upper end of the pull rod and corresponds to the main valve port; the cut-off spring is located inside the cut-off pressure-regulating screw plug. The cut-off part is a prior art and is not described in detail herein.

[0017] Beneficial effects of the utility model:

[0018] The utility model discloses a parallel gas pressure regulating device, in which a first gas transmission branch pipe and a second gas transmission branch pipe are arranged vertically, a filter device, a pressure gauge and a gas regulating component are symmetrically arranged, and the two filter devices, the two pressure gauges and the two gas regulating components use the same equipment, a signal balance pipe balances the pressure of the first gas transmission branch pipe and the second gas transmission branch pipe, so the pressure loss of the first gas transmission branch pipe and the second gas transmission branch pipe and the pipe fittings is the same, avoiding overload operation of one pipe and small load operation of the other pipe; on the other hand, all structures are arranged in a box body, and no connection is required outside the box body, thus saving materials such as inlet and outlet pipes, pipe fittings and valves, reducing unnecessary investment, and solving the problem of large equipment footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of two voltage regulating boxes in parallel in the prior art.

[0020] Figure 2 This is a schematic diagram of a parallel gas pressure regulating device of the utility model.

[0021] Figure 3 This is a schematic diagram of the gas regulating components.

[0022] Reference numerals:

[0023] 1-inlet ball valve, 2-filter device, 3-pressure gauge, 4-gas regulating component, 401-shell, 402-main valve port, 403-inlet end, 404-outlet end, 5-pressure signal pipe, 6-signal balance pipe, 7-signal pipe regulating valve, 8-outlet ball valve, 9-box,

[0024] 10-pressure regulating part, 101-adjusting chamber, 1011-adjusting upper chamber, 1012-adjusting lower chamber, 102-adjusting tray, 103-adjusting diaphragm, 104-adjusting spring, 105-adjusting nut, 106-adjusting connecting shaft, 107-adjusting connecting rod, 108-adjusting valve stem, 109-adjusting valve disc,

[0025] 11-cut-off part, 1101-cut-off cavity, 1102-pull rod, 1103-cut-off spring, 1104-cut-off pressure regulating screw plug, 1105-cut-off diaphragm, 1106-cut-off tray, 1107-cut-off valve disc,

[0026] L1-the first gas transmission branch pipe, L2-the second gas transmission branch pipe, L3-the gas output main pipe, L4-the gas input main pipe. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings.

[0028] like Figure 2 and Figure 3 As shown, the utility model provides a parallel gas pressure regulating device, which includes a box body 9, in which two parallel first gas delivery branch pipes L1 and second gas delivery branch pipes L2 are arranged, and the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 are respectively provided with a filtering device 2 for filtering out impurities, a pressure gauge 3 for displaying gas pressure, and a gas regulating component 4 for regulating gas pressure in sequence along the gas delivery direction. The first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 merge into a gas output main pipe L3, and the gas output main pipe L3 extends to the outside of the box body 9 and is connected to the downstream gas delivery pipeline, and the two gas regulating components 4 are connected via a signal balance pipe 6.

[0029] The box body 9 is provided with a gas inlet, which is connected to the gas input main pipe L4 through an inlet flange. The gas input main pipe L4 entering the box body 9 is divided into a first gas delivery branch pipe L1 and a second gas delivery branch pipe L2 after passing through an inlet ball valve 1.

[0030] The box body 9 is provided with a gas outlet, which is connected to the gas output main pipe L3 through an outlet flange. The gas output main pipe L3 extends out of the box body 9 after passing through an outlet ball valve 8 and is connected to a downstream gas delivery pipeline.

[0031] The first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 are arranged vertically to facilitate the pressure balance of the gas regulating component 4 of the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2, so that the pressure losses of the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 are the same.

[0032] The filter device 2, the pressure gauge 3, and the gas regulating component 4 on the first gas transmission branch pipe L1 and the second gas transmission branch pipe L2 are symmetrically arranged, and the two filter devices 2, the two pressure gauges 3, and the two gas regulating components 4 use the same equipment.

[0033] The pipeline distance between the confluence point of the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 and the gas regulating component 4 on the first gas delivery branch pipe L1 is preferably equal to the pipeline distance between the confluence point of the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 and the gas regulating component 4 on the second gas delivery branch pipe L2.

[0034] The gas regulating component 4 includes a shell 401 connected to the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2, a main valve port 402 is provided inside the shell 401, a pressure regulating part 10 is provided in the shell 401 above the main valve port 402, a cut-off part 11 is provided in the shell 401 below the main valve port 402, the left side of the main valve port 402 is the gas inlet end 403 of the gas regulating component 4, and the right side of the main valve port 402 is the gas outlet end 404.

[0035] The pressure regulating part 10 includes a regulating chamber 101 arranged above the main valve port 402, and a regulating diaphragm 103 with an adjusting tray 102 is arranged in the regulating chamber 101. The regulating diaphragm 103 divides the regulating chamber 101 into an upper regulating chamber 1011 and a lower regulating chamber 1012. The upper regulating chamber 1011 is provided with an adjusting spring 104, an adjusting nut 105, and an adjusting connecting shaft 106. The adjusting nut 105 is arranged at the upper end of the adjusting connecting shaft 106. The lower end of the adjusting connecting shaft 106 is connected to the adjusting tray 102 and extends to the lower regulating chamber 1012. The lower regulating chamber 1012 is provided with The adjusting connecting rod 107 and the adjusting valve stem 108, the head end of the adjusting connecting rod 107 is connected to the adjusting connecting shaft 106 below the adjusting tray 102, the tail end of the adjusting connecting rod 107 is connected to the adjusting valve stem 108, the bottom end of the adjusting valve stem 108 is connected to the adjusting valve disc 109 arranged above the main valve port 402, the adjusting connecting shaft 106 below the adjusting diaphragm 103 is provided with a relief valve seat, the adjusting tray 102 is provided with a relief hole, the adjusting lower chamber 1012 is connected to the air outlet end 404 on the right side of the main valve port 402 through the pressure signal tube 5, and the pressure signal tube 5 is provided with a signal tube regulating valve 7.

[0036] The signal balance tube 6 is connected between the two pressure-conducting signal tubes 5 .

[0037] The cut-off part 11 includes a cut-off chamber 1101, a pull rod 1102, a cut-off spring 1103, a cut-off pressure-regulating screw plug 1104, a cut-off diaphragm 1105, a cut-off tray 1106, and a cut-off valve flap 1107; the cut-off chamber 1101 is arranged below the main valve port 402, and the cut-off diaphragm 1105 is arranged through the cut-off tray 1106. The cut-off diaphragm 1105 divides the cut-off chamber 1101 into a cut-off left chamber and a cut-off right chamber. The cut-off right chamber is connected to the air outlet end 404 on the right side of the main valve port 402, and the cut-off valve flap 1107 is arranged at the upper end of the pull rod 1102 and corresponds to the main valve port 402; the cut-off spring 1103 is located inside the cut-off pressure-regulating screw plug 1104. The cut-off part 11 is a prior art and is not described in detail herein.

[0038] The gas enters the shell 401 from the gas inlet end 403, and is output from the shell 401 from the gas outlet end 404 after passing through the main valve port 402. Under normal circumstances, the pressure signal pipe 5 transmits the gas flow signal of the gas outlet end 404 to the regulating lower chamber 1012, and the gas pressure below the regulating diaphragm 103 is balanced with the regulating spring 104 above the regulating diaphragm 103, and the pressure of the gas outlet end 404 is adjusted by the regulating spring 104; when the pressure at the gas outlet end 404 decreases and is lower than the set value, the pressure below the regulating diaphragm 103 decreases, and the regulating diaphragm 103 moves downward under the action of the regulating spring 104. Under the action of the lever, the regulating connecting shaft 106 drives the regulating valve stem 108 to move upward through the regulating connecting rod 107, so that the regulating valve stem 108 drives the regulating valve disc 109 to move in the direction away from the main valve port 402, and the opening of the main valve port 402 increases, the flow rate increases, and the downstream pressure is maintained constant; when the gas outlet pressure is higher than the set value, its effect is opposite to the above process.

[0039] When the pressure at the gas outlet end 404 exceeds the relief pressure setting value, the gas is discharged to the regulating upper chamber 1011 through the relief valve seat and the relief holes on the tray, and then discharged through the upper shell of the regulating diaphragm 103, so that the pressure at the gas outlet end 404 drops rapidly. When it is lower than the relief setting value, the relief holes are automatically closed and the gas supply continues.

[0040] When the pressure at the gas outlet 404 continues to rise and is higher than the set pressure value of the cut-off part 11, the cut-off part 11 works, the pull rod 1102 moves up quickly, the cut-off valve flap 1107 closes the main valve port 402, and the gas supply is stopped. After the fault is eliminated, the pull rod 1102 is pulled downward to open the cut-off part 11 again. Example 1

[0041] A parallel gas pressure regulating device comprises a box body 9, in which two parallel first gas delivery branch pipes L1 and second gas delivery branch pipes L2 are arranged, and the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 are respectively provided with a filter device 2 for filtering out impurities, a pressure gauge 3 for displaying gas pressure, and a gas regulating component 4 for regulating gas pressure in sequence along the gas delivery direction. The first gas delivery branch pipe L1 and the second gas delivery branch pipe L2 merge into a gas output main pipe L3, and the gas output main pipe L3 extends to the outside of the box body 9 and is connected to the downstream gas delivery pipeline, and the two gas regulating components 4 are connected via a signal balance pipe 6. The gas regulating component 4 includes a shell 401 connected to the first gas delivery branch pipe L1 and the second gas delivery branch pipe L2, a main valve port 402 is provided inside the shell 401, a pressure regulating part 10 is provided in the shell 401 above the main valve port 402, a cut-off part 11 is provided in the shell 401 below the main valve port 402, the left side of the main valve port 402 is the gas inlet end 403 of the gas regulating component 4, and the right side of the main valve port 402 is the gas outlet end 404.

[0042] The working process is as follows:

[0043] Under normal circumstances, the natural gas entering the box 9 from the gas input main pipe L4 is divided into two paths, entering the first gas transmission branch pipe L1 and the second gas transmission branch pipe L2, entering the gas regulating component 4 after being filtered, and then converging into the gas output main pipe L3 to be transported downstream;

[0044] When the gas consumption of the downstream users increases or the gas source inlet pressure decreases, the pressure at the gas outlet 404 decreases. At this time, the pressure is reflected by the pressure signal pipe 5. After the gas flow in the pressure signal pipe 5 is balanced by the signal balance pipe 6, the force changes in the regulating lower chambers 1012 of the two pressure regulating parts 10 are the same, the regulating diaphragms 103 drop to the same height, the regulating valve disc 109 is at the same distance from the main valve port 402, the gas flow increase is the same, and the two gas regulating components 4 operate under the same working conditions;

[0045] When the gas consumption of downstream users decreases or the gas source inlet pressure increases, the pressure at the gas outlet 404 rises. At this time, the pressure is reflected by the pressure signal tube 5. The airflow in the pressure signal tube 5 is balanced by the signal balance tube 6, so that the force changes in the regulating lower chamber 1012 of the two pressure regulating parts 10 are the same, the rising height of the regulating diaphragm 103 is the same, the distance between the regulating valve disc 109 and the main valve port 402 is the same, the gas flow increase is the same, and the two gas regulating components 4 operate under the same working conditions.

[0046] The preferred embodiments of the present invention are described above, however, the above description is not intended to be limiting. A person skilled in the art may make many changes or modifications to the present invention without departing from the spirit and scope of the present invention. Such changes or modifications should be included within the scope of the appended claims.

Claims

1. A parallel gas pressure regulating device, characterized in that: The invention comprises a box body (9), wherein two parallel first gas transmission branch pipes (L1) and second gas transmission branch pipes (L2) are arranged in the box body (9); a filter device (2) for filtering impurities, a pressure gauge (3) for displaying gas pressure, and a gas regulating component (4) for regulating gas pressure are arranged on the first gas transmission branch pipe (L1) and the second gas transmission branch pipe (L2) in sequence along the gas transmission direction; the first gas transmission branch pipe (L1) and the second gas transmission branch pipe (L2) are merged into a gas output main pipe (L3); the gas output main pipe (L3) extends to the outside of the box body (9) and is connected to a downstream gas transmission pipeline; and the two gas regulating components (4) are connected via a signal balancing pipe (6).

2. The gas pressure regulating device according to claim 1, characterized in that: The box body (9) is provided with a gas inlet, which is connected to a gas input main pipe (L4) via an inlet flange. The gas input main pipe (L4) entering the box body (9) is divided into a first gas transmission branch pipe (L1) and a second gas transmission branch pipe (L2) after passing through an inlet ball valve (1).

3. The gas pressure regulating device according to claim 2, characterized in that: The box body (9) is provided with a gas outlet, which is connected to a gas output main pipe (L3) via an outlet flange. The gas output main pipe (L3) extends out of the box body (9) after passing through an outlet ball valve (8) and is connected to a downstream gas transmission pipeline.

4. The gas pressure regulating device according to claim 1, characterized in that: The first gas transmission branch pipe (L1) and the second gas transmission branch pipe (L2) are arranged vertically.

5. The gas pressure regulating device according to any one of claims 1 to 4, characterized in that: The filter devices (2), pressure gauges (3), and gas regulating components (4) on the first gas transmission branch pipe (L1) and the second gas transmission branch pipe (L2) are symmetrically arranged, and the two filter devices (2), the two pressure gauges (3), and the two gas regulating components (4) use the same equipment.

6. The gas pressure regulating device according to claim 5, characterized in that: The pipeline distance between the confluence point of the first gas transmission branch pipe (L1) and the second gas transmission branch pipe (L2) and the gas regulating component (4) on the first gas transmission branch pipe (L1) is equal to the pipeline distance between the confluence point of the first gas transmission branch pipe (L1) and the second gas transmission branch pipe (L2) and the gas regulating component (4) on the second gas transmission branch pipe (L2).

7. The gas pressure regulating device according to any one of claims 1 to 4, characterized in that: The gas regulating component (4) comprises a shell (401) connected to a first gas transmission branch pipe (L1) and a second gas transmission branch pipe (L2); a main valve port (402) is provided inside the shell (401); a pressure regulating portion (10) is provided inside the shell (401) above the main valve port (402); a cut-off portion (11) is provided inside the shell (401) below the main valve port (402); the left side of the main valve port (402) is an air inlet end (403) of the gas regulating component (4); and the right side of the main valve port (402) is an air outlet end (404).

8. The gas pressure regulating device according to claim 7, characterized in that: The pressure regulating part (10) comprises a regulating chamber (101) arranged above the main valve port (402); a regulating diaphragm (103) with a regulating tray (102) is arranged in the regulating chamber (101); the regulating diaphragm (103) divides the regulating chamber (101) into an upper regulating chamber (1011) and a lower regulating chamber (1012); a regulating spring (104), an adjusting nut (105), and an adjusting connecting shaft (106) are arranged in the upper regulating chamber (1011); the adjusting nut (105) is arranged at the upper end of the adjusting connecting shaft (106); the lower end of the adjusting connecting shaft (106) is connected to the regulating tray (102) and extends to the lower regulating chamber (1012); a regulating spring (104), an adjusting nut (105), and an adjusting connecting shaft (106) are arranged in the lower regulating chamber (1012); There are an adjusting connecting rod (107) and an adjusting valve stem (108), the head end of the adjusting connecting rod (107) is connected to the adjusting connecting shaft (106) below the adjusting tray (102), the tail end of the adjusting connecting rod (107) is connected to the adjusting valve stem (108), the bottom end of the adjusting valve stem (108) is connected to the adjusting valve disc (109) arranged above the main valve port (402), a relief valve seat is arranged on the adjusting connecting shaft (106) below the adjusting diaphragm (103), a relief hole is arranged on the adjusting tray (102), the adjusting lower chamber (1012) is connected to the air outlet end (404) on the right side of the main valve port (402) through the pressure signal pipe (5), and a signal pipe regulating valve (7) is arranged on the pressure signal pipe (5).

9. The gas pressure regulating device according to claim 8, characterized in that: The signal balance tube (6) is connected between the two pressure-conducting signal tubes (5).

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