Gas pressure reducing valve and gas control system

Abstract

The utility model relates to a kind of gas pressure reducing valve and gas control system, pressure reducing valve includes pressure reducing valve body and pressure reducing valve back cover, both form mounting cavity, pressure reducing assembly is equipped in mounting cavity, air inlet passage and air outlet passage that are communicated with mounting cavity are set up on pressure reducing valve body, air outlet passage includes first air outlet passage, valve stem cavity and second air outlet passage sequentially communicated along air outlet direction;Valve stem cavity is set up on the outer wall of pressure reducing valve body, control valve is installed on pressure reducing valve body;Control valve includes speed reducer and valve stem, speed reducer can drive valve stem move along axial direction;The other end of valve stem is equipped with taper head, taper head is movable and the connecting port of first air outlet passage and valve stem cavity is cooperated to realize opening degree adjustment, the utility model can be according to the working condition of engine, gas flow is adjusted by control valve, make the supply amount of gas and the working condition of engine match;Gas control system has the pressure reducing valve of preceding structure, and has same technical effect.

Description

Technical Field

[0001] This utility model relates to the field of multi-fuel gas turbine technology, specifically to a gas pressure reducing valve and a gas control system. Background Technology

[0002] Multi-fuel universal engines can select either gasoline or natural gas as the fuel medium. When using natural gas, the engine controls the gas pressure and the flow of gas through a gas pressure reducing valve. In existing technology, the gas pressure reducing valves used in multi-fuel universal engines are fixed-flow products. During engine operation, the gas flow rate cannot be adjusted, which can easily lead to a mismatch between the gas supply and the engine's operating conditions, thus affecting the stability of engine operation. Utility Model Content

[0003] The first objective of this invention is to provide a gas pressure reducing valve that addresses the problem that the gas pressure reducing valve in existing multi-fuel universal engines cannot regulate the gas flow rate, which easily leads to a mismatch between the gas supply and the engine's operating conditions, thereby affecting the stability of engine operation. The second objective of this invention is to provide a gas control system.

[0004] To achieve the aforementioned primary objective, the technical solution adopted by this utility model is as follows: A gas pressure reducing valve includes a pressure reducing valve body and a pressure reducing valve rear cover, which together form an installation cavity. A pressure reducing component is disposed within the installation cavity. The pressure reducing valve body has an inlet channel and an outlet channel communicating with the installation cavity. The outlet channel includes a first outlet channel, a valve stem cavity, and a second outlet channel connected sequentially along the outlet direction. The valve stem cavity is located on the outer wall of the pressure reducing valve body. A control valve is installed on the pressure reducing valve body, forming a seal with the opening of the valve stem cavity. The control valve includes a geared motor and a valve stem. The output shaft of the geared motor is connected to one end of the valve stem, which can drive the valve stem to move axially. The other end of the valve stem has a cone that can move under the action of the valve stem and cooperates with the connection between the first outlet channel and the valve stem cavity to adjust the opening degree.

[0005] In this utility model employing the aforementioned technical solution, natural gas enters the mounting cavity from the intake channel, is stabilized by the pressure reducing component, and then sequentially enters the engine through the first outlet channel, the valve stem cavity, and the second outlet channel. A control valve is installed, and its reduction motor drives the valve stem to move axially, thereby moving the cone head axially. This cone head engages with the connection between the first outlet channel and the valve stem cavity to adjust the opening, thus regulating the gas flow rate. During use, the gas flow rate is adjusted according to the engine's operating conditions. Compared to existing multi-fuel universal engine gas pressure reducing valves, which cannot adjust the gas flow rate and are prone to mismatching the gas supply with the engine's operating conditions, thus affecting engine stability, this utility model can adjust the gas flow rate through the control valve according to the engine's operating conditions, ensuring that the gas supply matches the engine's operating conditions and guaranteeing stable engine operation.

[0006] Furthermore, the output shaft of the geared motor is connected to the valve stem via a threaded connection, and the geared motor is equipped with a limit seat to prevent the valve stem from rotating during movement. The output shaft of the geared motor is connected to the valve stem via a threaded connection, and the valve stem rotation is restricted by the limit seat, so that the rotation of the output shaft of the geared motor can be converted into the axial movement of the valve stem.

[0007] Furthermore, the output shaft of the geared motor is a cylindrical structure, and the output shaft is provided with an internal thread surface; one end of the valve stem is provided with an external thread surface, and the external thread surface mates with the internal thread surface; the side wall of the valve stem is provided with a first anti-rotation plane located between the external thread surface and the cone head, the first anti-rotation plane is parallel to the axial direction of the valve stem, and the limiting seat is provided with a second anti-rotation plane that fits against the first anti-rotation plane.

[0008] Furthermore, the limiting seat includes a limiting cylinder connected to the geared motor, and the limiting cylinder is coaxially arranged with the valve stem; the limiting cylinder has a limiting hole at its center, the valve stem is inserted into the limiting hole and passes through the limiting seat, and the second anti-rotation plane is provided on the hole wall of the limiting hole. With this arrangement, the limiting seat not only prevents the valve stem from rotating, but also supports the valve stem and provides radial limiting, reducing the error of the valve stem deviating from the axis during movement.

[0009] Furthermore, a first anti-rotation plane is provided on each of the opposite sides of the valve stem sidewall, and a second anti-rotation plane is provided on each of the opposite sides of the limiting hole wall; the valve stem is configured as a symmetrical structure with its center of gravity located on the axis.

[0010] Furthermore, the valve stem has a convex ring on its side wall, which is connected to the end face of the cone. It also includes a first spring, with its two ends respectively sleeved on the convex ring and the limiting cylinder, and its two ends respectively abutting against the cone and the limiting seat. With this arrangement, the elastic force of the first spring can further ensure the coaxiality of the valve stem, the limiting cylinder, and the output shaft of the reduction motor. At the same time, the first spring can provide preload force to keep the external thread of the valve stem in contact with the internal thread of the output shaft, ensuring the smoothness of force transmission during the movement of the valve stem.

[0011] Furthermore, a connecting seat is fitted around the outside of the geared motor, and the connecting seat is fixedly connected to the pressure reducing valve body; one end of the connecting seat is provided with an annular plug, which is inserted into the opening of the valve stem cavity, and a sealing ring is fitted on the plug; the annular plug is inserted into the opening of the valve stem cavity and sealed by the sealing ring to effectively prevent gas leakage, and the plug is designed to be annular so that the valve stem can pass through the center.

[0012] Furthermore, an electromagnetic on / off valve is installed in the air intake channel; the electromagnetic on / off valve is used to control the opening and closing of the air intake channel.

[0013] To achieve the second objective, the present invention adopts the following technical solution: A gas control system includes the aforementioned gas pressure reducing valve.

[0014] Furthermore, it also includes a gas source, an engine, and a control module. The gas source, gas pressure reducing valve, and engine are connected sequentially through a gas passage. The geared motor and engine are electrically connected to the control module. The gas supplied by the gas source enters the engine through the gas passage. The gas pressure reducing valve is installed on the gas passage. The control module adjusts the gas flow by controlling the geared motor to match the gas flow requirements of the engine under different operating conditions, obtains a more suitable air-fuel mixture concentration for the current operating conditions of the engine, and makes the gaseous fuel burn more completely, thus achieving precise adjustment of the gas flow under different operating conditions.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the gas flow rate can be adjusted by the control valve according to the engine's operating conditions, so that the gas supply is matched with the engine's operating conditions, ensuring stable engine operation; the gas control system has the same technical effect as the aforementioned gas control valve. Attached image description: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram from another perspective of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a schematic diagram of the pressure reducing valve body; Figure 5 A structural schematic diagram of the pressure reducing valve body from another perspective; Figure 6 This is a schematic diagram of the pressure-reducing component. Figure 7 This is a schematic diagram of the control valve structure; Figure 8 This is a schematic diagram of the control valve after the connector has been removed. Figure 9 for Figure 8 Exploded view; Figure 10 This is a diagram of a gas control system.

[0016] The diagram shows the following markings: 01-Gas pressure reducing valve, 02-Gas source, 03-Engine, 04-Control module, 05-Gas passage, 1-Pressure reducing valve body, 2-Pressure reducing valve rear cover, 3-Pressure reducing assembly, 4-Control valve, 5-Solenoid on / off valve, 6-Pressure sensor, 7-Inlet nozzle, 8-Outlet nozzle, 9-Inlet passage, 10-First outlet passage, 11-Valve stem chamber, 12-Second outlet passage, 13-Connection port, 14-Gear motor, 15-Valve stem, 16-Output shaft, 17-Cone, 18-External thread surface, 19-First anti-rotation plane, 20-Limiting hole, 21-Second anti-rotation plane, 22-Limiting cylinder, 23-Base, 24-Protruding ring, 25-First spring, 26-Connecting seat, 27-Plug, 28-Sealing diaphragm, 29-Pressure plate, 30-Second spring, 31-Connecting column. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings.

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] Example 1: This example provides a gas pressure reducing valve, such as... Figures 1-9As shown, the device includes a pressure reducing valve body 1 and a pressure reducing valve rear cover 2, which together form an installation cavity. A pressure reducing assembly 3 is installed within the installation cavity. The pressure reducing assembly 3 is a pressure reducing assembly found in a two-stage pressure reducing valve in the prior art. The pressure reducing valve body 1 has an inlet channel 9 and an outlet channel communicating with the installation cavity. The outlet channel includes a first outlet channel 10, a valve stem cavity 11, and a second outlet channel 12 connected sequentially along the outlet direction. The valve stem cavity 11 is located on the outer wall of the pressure reducing valve body 1. A control valve is installed on the pressure reducing valve body 1, forming a seal between the valve stem cavity 11 and the valve stem cavity 11 opening. 4; The control valve 4 includes a geared motor 14 and a valve stem 15. The output shaft 16 of the geared motor 14 is connected to one end of the valve stem 15, which can drive the valve stem 15 to move axially. The other end of the valve stem 15 is provided with a cone 17. The cone 17 can move under the drive of the valve stem 15 and cooperate with the connection port 13 of the first air outlet channel 10 and the valve stem cavity 11 to realize the opening adjustment. The cone 17 is conical, and the connection port 13 is a circular opening. The diameter of the large end of the cone 17 is larger than the diameter of the connection port 13, so that the cone 17 can move to completely block the connection port 13. The connection method between the output shaft 16 of the geared motor 14 and the valve stem 15 is not limited, as long as it can drive the valve stem 15 to move axially; for example, the output shaft 16 can be connected to the valve stem 15 through a threaded pair, or the output shaft 16 can be connected to the valve stem 15 through a ball screw pair, or other connection methods that can convert rotation into linear motion. In this embodiment, the output shaft 16 of the geared motor 14 is connected to the valve stem 15 via a threaded drive. The geared motor 14 is provided with a limiting seat to prevent the valve stem 15 from rotating during movement. The output shaft 16 of the geared motor 14 is a cylindrical structure with an internal thread surface. One end of the valve stem 15 is provided with an external thread surface 18, which mates with the internal thread surface. The side wall of the valve stem 15 is provided with a first anti-rotation plane 19 located between the external thread surface 18 and the cone 17. The first anti-rotation plane 19 is parallel to the axial direction of the valve stem 15. The limiting seat is provided with a second anti-rotation plane that fits against the first anti-rotation plane 19. Alternatively, the output shaft 16 can be a rod with an external thread surface at its end. One end of the valve stem 15 has a central hole with an internal thread surface on its wall, and the external thread surface mates with the internal thread surface. The limiting seat includes a limiting cylinder 22 connected to the geared motor 14, and the limiting cylinder 22 is coaxially arranged with the valve stem 15; the limiting cylinder 22 has a limiting hole 20 at its center, the valve stem 15 is inserted into the limiting hole 20 and passes through the limiting seat, and a second anti-rotation plane 21 is provided on the hole wall of the limiting hole 20; a first anti-rotation plane 19 is provided on each of the opposite sides of the side wall of the valve stem 15, and a second anti-rotation plane 21 is provided on each of the opposite sides of the hole wall of the limiting hole 20; The limiting seat also includes a base 23, which is connected to one end of the limiting cylinder 22. The limiting cylinder 22 is connected to the geared motor 14 through the base 23. The valve stem 15 passes through the limiting cylinder 22 and the base 23 and is connected to the output shaft 16 through a threaded pair. The valve stem 15 has a convex ring 24 on its side wall, which is connected to the end face of the cone head 17; it also includes a first spring 25, the two ends of which are respectively sleeved on the convex ring 24 and the limiting sleeve 22, and the two ends of the first spring 25 respectively abut against the cone head 17 and the base 23 of the limiting seat. A connecting seat 26 is fitted around the outside of the geared motor 14, and the connecting seat 26 is fixedly connected to the pressure reducing valve body 1. The connecting seat 26 is cylindrical and fits around the outside of the geared motor 14. Two opposing connecting ears are provided on the outer wall of the cylindrical connecting seat 26. The connecting seat 26 is connected to the pressure reducing valve body 1 by bolts to the two connecting ears. One end of the connecting seat 26 is provided with an annular plug 27, which is inserted into the opening of the valve stem cavity 11. A sealing ring (not shown in the figure) is fitted on the plug 27. The sealing ring is located between the outer wall of the plug 27 and the opening wall of the valve stem cavity 11 to form a seal. The pressure reducing assembly 3 is a pressure reducing assembly in a secondary pressure reducing valve in the prior art, including a sealing diaphragm 28, a pressure plate 29, a second spring 30, and a connecting post 31. One end of the second spring 30 is connected to the pressure reducing valve body 1, and the other end is connected to the pressure plate 29. The sealing diaphragm 28 is fixed between the pressure reducing valve rear cover 2 and the pressure reducing valve body 1. The right end of the pressure plate 29 is connected to the sealing diaphragm 28 through the connecting post 31. The pressure plate 29 is hinged to the inside of the pressure reducing valve body 1. The hinge point between the pressure plate 29 and the pressure reducing valve body 1 is located between the left end of the pressure plate 29 and the second spring 30. The left end of the pressure plate 29 can close one end of the air outlet of the air inlet channel 9. The secondary pressure reducing valve is prior art, and its working principle will not be described here. An electromagnetic on / off valve 5 is installed in the air intake passage 9; a pressure sensor 6 is installed in the air intake passage 9, and the pressure sensor 6 is located between the air intake end of the air intake passage 9 and the electromagnetic on / off valve 5; the pressure sensor 6 determines whether the gas pressure meets the standard by sensing the pressure. If it does, the electromagnetic on / off valve 5 opens the air intake passage 9. One end of the air intake channel 9 is connected to the air intake nozzle 7, and the other end of the second air outlet channel 12 is connected to the air outlet nozzle 8.

[0020] In this utility model employing the aforementioned technical solution, natural gas enters the mounting cavity from the intake channel 9, is stabilized by the pressure reducing component 3, and then sequentially enters the engine 03 through the first outlet channel 10, the valve stem cavity 11, and the second outlet channel 12. A control valve 4 is provided, and the reduction motor 14 of the control valve 4 can drive the valve stem 15 to move axially, thereby driving the cone 17 to move axially. This cone 17 cooperates with the connection port 13 of the first outlet channel 10 and the valve stem cavity 11 to adjust the opening, thus regulating the gas flow rate. During use, the gas flow rate is adjusted according to the operating conditions of the engine 03. Compared to the existing multi-fuel universal engine's gas pressure reducing valve, which cannot adjust the gas flow rate and easily leads to a mismatch between the gas supply and the engine's operating conditions, thus affecting the engine's operational stability, this utility model can adjust the gas flow rate according to the engine's operating conditions through the control valve, ensuring that the gas supply matches the engine's operating conditions and guaranteeing stable engine operation.

[0021] Example 2: A gas control system includes the gas pressure reducing valve 01 mentioned above, and also includes a gas source 02, an engine 03 and a control module 04. The gas source 02, the gas pressure reducing valve 01 and the engine 03 are connected in sequence through a gas passage 05. The geared motor 14 and the engine 03 are electrically connected to the control module 04 respectively. The gas supplied by gas source 02 enters the engine 03 through gas passage 05. Gas pressure reducing valve 01 is installed on gas passage 05. Control module 04 adjusts the gas flow by controlling geared motor 14 to match the gas flow requirements of engine 03 under different operating conditions, obtains a more suitable air-fuel mixture concentration for the current operating conditions of engine 03, so that the gaseous fuel can be burned more completely, and achieves precise adjustment of gas flow under different operating conditions.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas pressure reducing valve, comprising a pressure reducing valve body (1) and a pressure reducing valve rear cover (2), which together form an installation cavity, a pressure reducing component (3) is provided in the installation cavity, and an inlet channel (9) and an outlet channel communicating with the installation cavity are provided on the pressure reducing valve body (1), characterized in that: The air outlet channel includes a first air outlet channel (10), a valve stem cavity (11), and a second air outlet channel (12) connected sequentially along the air outlet direction; the valve stem cavity (11) is opened on the outer wall of the pressure reducing valve body (1), and a control valve (4) is installed on the pressure reducing valve body (1) to form a seal with the opening of the valve stem cavity (11); the control valve (4) includes a geared motor (14) and a valve stem (15), the output shaft (16) of the geared motor (14) is connected to one end of the valve stem (15), and can drive the valve stem (15) to move axially; the other end of the valve stem (15) is provided with a cone (17), which can move under the drive of the valve stem (15) and cooperate with the connection port (13) of the first air outlet channel (10) and the valve stem cavity (11) to realize the opening adjustment.

2. The gas pressure reducing valve according to claim 1, characterized in that: The output shaft (16) of the geared motor (14) is connected to the valve stem (15) via a threaded connection. The geared motor (14) is provided with a limit seat, which is used to prevent the valve stem (15) from rotating during movement.

3. The gas pressure reducing valve according to claim 2, characterized in that: The output shaft (16) of the geared motor (14) is a cylindrical structure, and the output shaft (16) is provided with an internal thread surface; one end of the valve stem (15) is provided with an external thread surface (18), and the external thread surface (18) is engaged with the internal thread surface; the side wall of the valve stem (15) is provided with a first anti-rotation plane (19) located between the external thread surface (18) and the cone (17), the first anti-rotation plane (19) is parallel to the axial direction of the valve stem (15), and the limiting seat is provided with a second anti-rotation plane (21) that fits against the first anti-rotation plane (19).

4. The gas pressure reducing valve according to claim 3, characterized in that: The limiting seat includes a limiting cylinder (22) connected to the geared motor (14). The limiting cylinder (22) is coaxially arranged with the valve stem (15). The limiting cylinder (22) has a limiting hole (20) at its center. The valve stem (15) is inserted into the limiting hole (20) and passes through the limiting seat. The second anti-rotation plane (21) is provided on the hole wall of the limiting hole (20).

5. The gas pressure reducing valve according to claim 4, characterized in that: The valve stem (15) has a first anti-rotation plane (19) on each of the opposite sides of its sidewall, and the limiting hole (20) has a second anti-rotation plane (21) on each of the opposite sides of its sidewall.

6. The gas pressure reducing valve according to claim 4, characterized in that: The valve stem (15) has a convex ring (24) on its side wall, which is connected to the end face of the cone (17); it also includes a first spring (25), the two ends of which are respectively sleeved on the convex ring (24) and the limiting cylinder (22), and the two ends of the first spring (25) respectively abut against the cone (17) and the limiting seat.

7. The gas pressure reducing valve according to claim 1, characterized in that: The geared motor (14) is fitted with a connecting seat (26), which is fixedly connected to the pressure reducing valve body (1). One end of the connecting seat (26) is provided with an annular plug (27), which is inserted into the opening of the valve stem cavity (11). A sealing ring is fitted on the plug (27).

8. The gas pressure reducing valve according to claim 1, characterized in that: An electromagnetic on / off valve (5) is installed in the air intake channel (9).

9. A gas control system, characterized in that: The gas pressure reducing valve (01) includes any one of claims 1-8.

10. The gas control system according to claim 9, characterized in that: It also includes a gas source (02), an engine (03) and a control module (04). The gas source (02), the gas pressure reducing valve (01) and the engine (03) are connected in sequence through a gas passage (05). The geared motor (14) and the engine (03) are electrically connected to the control module (04) respectively.

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