Fuel gas pressure reducing valve

Abstract

The utility model relates to the technical field of engine accessories, in particular to a gas pressure reducing valve. The pressure reducing valve comprises a pressure reducing valve body and a rear cover which are connected, the pressure reducing valve body and the rear cover jointly define a mounting cavity, a pressure reducing assembly is arranged in the mounting cavity, and an air inlet channel and an air outlet channel which are communicated with the mounting cavity are formed in the pressure reducing valve body. The rotating piece penetrates through the air outlet channel and the mounting cavity and is rotationally connected with the pressure reducing valve body. The rotating piece comprises a first rotating shaft located in the air outlet channel, the diameter of the first rotating shaft is matched with the inner diameter of the air outlet channel, and a vent groove is formed in the first rotating shaft in the direction parallel to the radial line. The motor is fixedly connected to the outer side of the pressure reducing valve body, and the output end of the motor drives the rotating part to rotate through the transmission assembly, so that the opening degree of the vent groove is adjusted, the flow of gas in the gas outlet channel in the pressure reducing valve is adjusted, and the situation that the gas flow is not matched with the working condition of an engine is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of engine accessories, in particular to a gas pressure reducing valve. Background Art

[0002] A gas fuel engine is an internal combustion engine that uses a mixture of combustible gas and air as fuel. A gas fuel engine controls the pressure of the gas and the on / off of the gas circuit through a gas pressure reducing valve.

[0003] The gas pressure reducing valve used in gas fuel engines on the market is a fixed flow product. During engine operation, the gas flow cannot be adjusted, which can easily lead to a mismatch between the gas supply and the engine's operating state, speed and other operating conditions, thereby affecting the stability of the engine's operation. Utility Model Content

[0004] The utility model aims to provide a gas pressure reducing valve, aiming to solve the problem that the existing gas pressure reducing valve cannot adjust the gas flow.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A gas pressure reducing valve comprises a pressure reducing valve body and a back cover connected to each other, the pressure reducing valve body and the back cover together enclose an installation cavity, a pressure reducing assembly is arranged in the installation cavity, an air inlet channel and an air outlet channel connected to the installation cavity are opened on the pressure reducing valve body, and the pressure reducing valve body also comprises a rotating part, a motor and a transmission assembly, the rotating part passes through the air outlet channel and the installation cavity, the rotating part is rotatably connected to the pressure reducing valve body, the rotating part comprises a first rotating shaft located in the air outlet channel, the diameter of the first rotating shaft matches the inner diameter of the air outlet channel, a ventilation groove is opened on the first rotating shaft in a direction parallel to a radial line, the motor is fixedly connected to the outside of the pressure reducing valve body, and the output end of the motor drives the rotating part to rotate through the transmission assembly.

[0007] By adopting the above scheme, in the initial state, the first rotating shaft blocks the gas outlet channel. When it is necessary to introduce gas, the motor drives the rotating part to rotate through the transmission assembly, thereby rotating the first rotating shaft, and the gas outlet channel is connected to the installation cavity through the ventilation groove on the first rotating shaft. The rotation angle of the rotating part is adjusted by the motor, thereby adjusting the opening of the ventilation groove, and then adjusting the flow of gas in the gas outlet channel. When in use, the rotation angle of the rotating part driven by the motor can be adjusted according to the working condition of the engine, so that the flow of gas matches the working condition of the engine. And because the rotating part runs through the gas outlet channel and the installation cavity, a connection point is added to the rotating part and the pressure reducing valve body at the intersection of the installation cavity and the gas outlet channel, thereby enhancing the stability of the rotating part.

[0008] The utility model is further configured that the two ventilation grooves are provided, and the two ventilation grooves are symmetrically arranged with respect to the radial line of the first rotating shaft. The two ventilation grooves can increase the maximum flux of the gas channel.

[0009] The utility model is further configured such that the position sensor is connected to the outside of the pressure reducing valve body, and the position sensor is connected to one end of the rotating member. The position sensor monitors the rotation angle of the rotating member, thereby monitoring the opening of the ventilation groove in the air outlet channel, so as to correct the rotation angle of the motor output shaft according to the monitoring data.

[0010] The utility model is further configured such that the transmission assembly includes a first transmission member and a second transmission member, one end of the first transmission member is fixedly connected to the output shaft of the motor, one end of the second transmission member is fixedly connected to the end of the rotating member away from the position sensor, the other end of the second transmission member has two limit parts, and the other end of the first transmission member is located between the two limit parts. When adjusting the gas flow, the first transmission member is driven to rotate by the motor, and the other end of the first transmission member is against the limit part when rotating, thereby driving the second transmission member to rotate, and the second transmission member drives the rotating member to rotate, thereby adjusting the gas flow.

[0011] The utility model is further configured to include a mounting seat and an adjusting bolt, wherein the mounting seat is provided with a mounting hole, the adjusting bolt is threadedly connected in the mounting hole, and one end of the adjusting bolt is located on the movement path of the limiting portion. The maximum movement range of the limiting portion can be limited by the adjusting bolt, thereby limiting the maximum rotation angle of the first transmission member, and further limiting the maximum opening of the venting groove, so as to avoid the situation where the venting groove continues to move after reaching the maximum opening, resulting in a decrease in the opening.

[0012] The utility model is further configured such that the outer side of the pressure reducing valve body has a closed flange, the flange encloses one end of the outlet of the outlet channel on the inner side, the flange is connected to an end cover, the flange, the end cover and the pressure reducing valve body together enclose a gas outlet chamber, and the end cover is connected to a gas outlet nozzle. The gas outlet nozzle can be conveniently connected to the corresponding gas pipeline.

[0013] The utility model is further configured such that the inner diameter of the area enclosed by the flange is larger than the inner diameter of the air outlet passage. Since the sizes of the air outlet nozzles required during use are different and the range enclosed inside the flange is large, the air outlet nozzles can be manufactured in a variety of sizes and specifications, and the size of the end cover remains unchanged, so as to adapt to the size requirements of different air outlet nozzles and avoid size modification of the pressure reducing valve body. On the other hand, since the inner diameter of the area enclosed by the flange is larger than the inner diameter of the air outlet passage, the air outlet chamber can play a role in stabilizing pressure.

[0014] The utility model is further configured that the end cover and the air outlet nozzle are integrally formed. The end cover and the air outlet nozzle are integrally formed, and the integrity of the two is better.

[0015] The utility model is further configured that one end of the air inlet passage is connected with an air inlet nozzle, which can be conveniently connected to the gas pipeline.

[0016] The utility model is further configured such that a solenoid valve is installed in the air inlet passage. Since the first rotating shaft can rotate in the air inlet passage, it is difficult for the first rotating shaft to completely seal the air outlet passage and cannot completely cut off the gas supply. The solenoid valve can add a layer of gas cut-off protection, and the solenoid valve can close the air inlet passage, thereby achieving the effect of ensuring that the gas supply can be cut off.

[0017] In summary, the gas pressure reducing valve provided by the utility model has at least the following beneficial effects:

[0018] 1. The gas pressure reducing valve can adjust the flow of gas and improve the consistency between the gas supply and the operating conditions of the engine.

[0019] 2. It can monitor the opening of the air outlet channel to avoid the inconsistency between the actual rotation angle of the motor and the actual rotation angle.

[0020] 3. The maximum opening angle of the rotating part is limited by a mechanical structure, thereby limiting the maximum opening of the ventilation slot and preventing excessive deflection of the rotating part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any novel labor.

[0022] Figure 1 is an exploded view of an embodiment;

[0023] Figure 2 is a schematic diagram of the three-dimensional structure of an embodiment;

[0024] Figure 3 is a rear view of the embodiment;

[0025] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0026] Figure 5 is a three-dimensional structural diagram of the pressure reducing valve body in the embodiment at a first viewing angle;

[0027] Figure 6 is a three-dimensional structural diagram of the pressure reducing valve body in the embodiment at a second viewing angle;

[0028] Figure 7 It is an exploded view of the pressure reducing valve body, the pressure reducing assembly and the rear cover in the embodiment.

[0029] In the figure: pressure reducing valve body 1, back cover 2, pressure reducing assembly 3, sealing diaphragm 301, pressure plate 302, spring 303, connecting column 304, air inlet channel 4, air outlet channel 5, rotating member 6, first rotating shaft 601, second rotating shaft 602, ventilation groove 603, motor 7, transmission assembly 8, first transmission member 801, second transmission member 802, limit portion 803, position sensor 9, mounting seat 10, ear plate 11, mounting hole 12, adjusting bolt 13, flange 14, end cover 15, air outlet chamber 16, air outlet nozzle 17, air inlet nozzle 18, solenoid valve 19, shaft hole 20. DETAILED DESCRIPTION

[0030] In order to make those skilled in the art better understand the technical solution of the utility model, the following Figure 1-7 The utility model is further described in detail with specific implementation methods.

[0031] See also Figure 1-7A gas pressure reducing valve provided in this embodiment includes a pressure reducing valve body 1 and a rear cover 2 which are arranged in sequence from top to bottom. The pressure reducing valve body 1 and the rear cover 2 are fixedly connected by bolts, and the pressure reducing valve body 1 and the rear cover 2 are enclosed together to form an installation cavity. A pressure reducing assembly 3 is arranged in the installation cavity, and the pressure reducing assembly 3 is a pressure reducing assembly in a secondary pressure reducing valve in the prior art. An air inlet channel 4 and an air outlet channel 5 which are connected to the installation cavity are provided on the pressure reducing valve body 1, and the air inlet channel 4 is connected to an air inlet nozzle 18, and the air inlet nozzle 18 is integrally formed with the pressure reducing valve body 1. The air inlet nozzle 18 is located at the rear side of the pressure reducing valve body 1, and the air outlet channel 5 is located at the front side of the pressure reducing valve body 1, and the cross section of the air outlet channel 5 is circular. An axial hole 20 which passes through the left and right sides is provided on the pressure reducing valve body 1, and the axial hole 20 vertically passes through the air outlet channel 5 and the installation cavity. The shaft hole 20 is rotatably connected with a rotating member 6, and the rotating member 6 includes a first rotating shaft 601 and a second rotating shaft 602 connected to each other. The first rotating shaft 601 passes through the shaft hole 20 to the right, and the left end of the second rotating shaft 602 passes through the shaft hole 20 to the left. The diameter of the first rotating shaft 601 matches the inner diameter of the air outlet channel 5. A ventilation groove 603 is provided on the upper side of the middle section of the first rotating shaft 601, and the ventilation groove 603 is provided in a direction parallel to the radial line of the first rotating shaft 601. There are two ventilation grooves 603 on the first rotating shaft 601, which are respectively located on the upper and lower sides of the first rotating shaft 601. The two ventilation grooves 603 are symmetrically arranged with the radial line of the first rotating shaft 601 as the center line, so that a door-plate-shaped closed door is formed on the first rotating shaft 601. The vent groove 603 can be formed by cutting the first rotating shaft 601. During cutting, two vent grooves 603 are symmetrically cut with the radial line of the first rotating shaft 601 as the center line, so as to form a plate-shaped closed door, and the upper and lower ends of the closed door are both arc-shaped surfaces that fit the air outlet channel 5. A motor 7 is fixedly connected to the right side of the pressure reducing valve body 1. The motor 7 adopts the stepping motor 7 in the prior art. The output shaft of the motor 7 drives the rotating member 6 to rotate through the transmission assembly 8. In order to show the installation position of the secondary pressure reducing valve, the pressure reducing assembly 3 of the secondary pressure reducing valve in the prior art includes a sealing diaphragm 301, a pressing plate 302, a connecting column 304 and a spring 303, wherein the upper end of the spring 303 is connected to the pressure reducing valve body 1, and the lower end is connected to the pressing plate 302. The sealing diaphragm 301 is fixed between the rear cover 2 and the pressure reducing valve body 1, and the right end of the pressing plate 302 is connected to the sealing diaphragm 301 through the connecting column 304. The pressure plate 302 is hinged on the inner side of the pressure reducing valve body 1, and the hinge point between the pressure plate 302 and the pressure reducing valve is located between the left end of the pressure plate 302 and the spring 303. The left end of the pressure plate 302 can be used to close one end of the air outlet of the air inlet channel 4. The two-stage pressure reducing valve is a prior art, and its working principle will not be repeated here.

[0032] With the above scheme, in the initial state, the first rotating shaft 601 blocks the gas outlet channel 5. When it is necessary to introduce gas, the motor 7 drives the rotating member 6 to rotate through the transmission assembly 8, thereby rotating the ventilation groove 603, and then the gas outlet channel 5 is connected with the installation cavity. The rotation angle of the rotating member 6 is adjusted by the motor 7, thereby adjusting the opening of the ventilation groove 603, and then adjusting the flow of gas in the gas outlet channel 5. And because the rotating member 6 runs through the gas outlet channel 5 and the installation cavity, a connection point is added to the rotating member 6 and the pressure reducing valve body 1 at the intersection of the installation cavity and the gas outlet channel 5, thereby enhancing the stability of the rotating member 6. The gas flow rate can be preset to several gears, each matching the corresponding working condition of the engine, and the motor 7 is automatically controlled by the external control unit to match the corresponding gear to achieve the effect of automatic control.

[0033] In order to ensure that the angle of rotation of the rotating member 6 driven by the motor 7 is consistent with the expected angle, a position sensor 9 is further included, and the position sensor 9 is connected to the left side of the pressure reducing valve body 1. The position sensor 9 is connected to the left end of the rotating member 6, specifically to the left end of the second rotating shaft 602 passing through the pressure reducing valve body 1.

[0034] In some embodiments, the transmission assembly 8 includes a first transmission member 801 and a second transmission member 802, wherein the lower end of the first transmission member 801 is fixedly connected to the output shaft of the motor 7, and the lower end of the second transmission member 802 is fixedly connected to the first rotating shaft 601. The upper end of the second transmission member 802 has two limiting portions 803, the limiting portions 803 protrude to the right, and the upper end of the first transmission member 801 is located between the two limiting portions 803. When the output shaft of the motor 7 drives the first transmission member 801 to rotate forward, the upper end of the first transmission member 801 abuts against the limiting portion 803 on the front side, thereby driving the rotating member 6 to rotate, thereby adjusting the flow of the air outlet channel 5 through the limiting portion 803. When the output shaft of the motor 7 rotates in the reverse direction, the upper end of the first transmission member 801 abuts against the limiting portion 803 on the rear side, thereby driving the venting groove 603 to adjust the flow of the air outlet channel 5 or reset to a state where the air outlet channel 5 is blocked by the first rotating shaft 601.

[0035] In order to limit the maximum opening of the vent groove 603, further, a mounting seat 10 and an adjusting bolt 13 are included. The mounting seat 10 is fixedly connected to the right side of the pressure reducing valve body 1. The front end of the mounting seat 10 is bent to form an ear plate 11. The ear plate 11 is provided with a mounting hole 12. The adjusting bolt 13 is threadedly connected in the mounting hole 12. The rear end of the adjusting bolt 13 is located on the movement path of the limiting portion 803. By adjusting the bolt 13 against the limiting portion 803, the maximum rotation angle of the second rotating member 6 can be limited, thereby limiting the maximum opening of the vent groove 603.

[0036] The outer side of the pressure reducing valve body 1 has a circle of closed flange 14, and the flange 14 encloses the outlet end of the outlet channel 5 on the inner side. The flange 14 is connected to the end cover 15. The flange 14, the end cover 15 and the pressure reducing valve body 1 together enclose a gas outlet chamber 16. The end cover 15 is connected to the gas outlet nozzle 17. The inner diameter of the area enclosed by the flange 14 is larger than the inner diameter of the gas outlet channel 5. The end cover 15 and the gas outlet nozzle 17 are integrally formed. The flange 14 has a large internal enclosure, and the gas outlet nozzle 17 can be made in a variety of sizes and specifications. The size of the end cover 15 remains unchanged, so as to adapt to the size requirements of different gas outlet nozzles 17 and avoid size modification of the pressure reducing valve body 1. On the other hand, since the inner diameter of the area enclosed by the flange 14 is larger than the inner diameter of the gas outlet channel 5, the gas outlet chamber 16 can play a role in stabilizing pressure. In order to ensure that the gas supply is completely cut off, a solenoid valve 19 is installed in the air inlet channel 4.

[0037] It should be noted that the words indicating direction in this article, such as up and down, are all based on Figure 1 The setting of the direction is only for the convenience of description and has no other specific meaning.

[0038] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0039] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A gas pressure reducing valve, comprising a pressure reducing valve body (1) and a rear cover (2) connected to each other, wherein the pressure reducing valve body (1) and the rear cover (2) together enclose a mounting cavity, a pressure reducing assembly (3) is arranged in the mounting cavity, and an air inlet channel (4) and an air outlet channel (5) communicating with the mounting cavity are provided on the pressure reducing valve body (1), characterized in that: The invention also comprises a rotating member (6), a motor (7) and a transmission assembly (8); the rotating member (6) passes through the air outlet passage (5) and the mounting cavity; the rotating member (6) is rotationally connected to the pressure reducing valve body (1); the rotating member (6) comprises a first rotating shaft (601) located in the air outlet passage (5); the diameter of the first rotating shaft (601) matches the inner diameter of the air outlet passage (5); a ventilation groove (603) is provided on the first rotating shaft (601) in a direction parallel to the radial line; the motor (7) is fixedly connected to the outer side of the pressure reducing valve body (1); the output end of the motor (7) drives the rotating member (6) to rotate through the transmission assembly (8).

2. A gas pressure reducing valve as claimed in claim 1, characterized in that: Two ventilation grooves (603) are provided, and the two ventilation grooves (603) are symmetrically arranged about the radial line of the first rotating shaft (601).

3. A gas pressure reducing valve as claimed in claim 1 or 2, characterized in that: It also comprises a position sensor (9), wherein the position sensor (9) is connected to the outside of the pressure reducing valve body (1), and the position sensor (9) is connected to one end of the rotating member (6).

4. A gas pressure reducing valve as claimed in claim 3, characterized in that: The transmission assembly (8) comprises a first transmission member (801) and a second transmission member (802), one end of the first transmission member (801) being fixedly connected to the output shaft of the motor (7), one end of the second transmission member (802) being fixedly connected to an end of the rotating member (6) away from the position sensor (9), the other end of the second transmission member (802) having two limiting portions (803), and the other end of the first transmission member (801) being located between the two limiting portions (803).

5. A gas pressure reducing valve as claimed in claim 4, characterized in that: It also includes a mounting seat (10) and an adjusting bolt (13); the mounting seat (10) is provided with a mounting hole (12); the adjusting bolt (13) is threadedly connected in the mounting hole (12); and one end of the adjusting bolt (13) is located on the movement path of the limiting portion (803).

6. A gas pressure reducing valve as claimed in claim 1, characterized in that: The outer side of the pressure reducing valve body (1) is provided with a circle of closed flange (14), the flange (14) encloses one end of the outlet passage (5) on the inner side, the flange (14) is connected to an end cover (15), the flange (14), the end cover (15) and the pressure reducing valve body (1) together enclose an outlet chamber (16), and the end cover (15) is connected to an outlet nozzle (17).

7. A gas pressure reducing valve as claimed in claim 6, characterized in that: The inner diameter of the area enclosed by the flange (14) is greater than the inner diameter of the air outlet channel (5).

8. A gas pressure reducing valve as claimed in claim 6 or 7, characterized in that: The end cover (15) and the air outlet nozzle (17) are integrally formed.

9. A gas pressure reducing valve as claimed in claim 1, characterized in that: One end of the air intake passage (4) is connected to an air intake nozzle (18).

10. A gas pressure reducing valve as claimed in claim 1, characterized in that: A solenoid valve (19) is installed in the air intake passage (4).

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