Gas pressure reducing valve with pilot-operated gas cut-off valve

Abstract

The utility model provides a fuel gas pressure reducing valve with a pilot-operated type fuel gas cut-off valve, which comprises a valve seat, a valve cover and a piston assembly, a gas inlet and a gas outlet are arranged on the valve seat, and the cut-off valve assembly is arranged on a gas inlet channel communicated between the gas inlet and the piston assembly and used for controlling on-off of gas flow in the pressure reducing valve. A three-way electromagnetic valve assembly is arranged in the valve seat on one side of the stop valve assembly, the three-way electromagnetic valve assembly is provided with an air inlet hole, a second air outlet hole and a third air outlet hole, and high-pressure air entering from the air inlet connector is communicated to the air inlet hole of the three-way electromagnetic valve assembly through a first process hole formed in the valve seat; the third air outlet hole is communicated with the back face of the stop valve assembly through a second process hole formed in the valve seat, and the second air outlet hole is communicated with the air outlet through a third process hole formed in the valve seat. Through the design of the independent three-way electromagnetic valve, a valve element switch is controlled by adopting very small electromagnetic force, so that the airflow direction is controlled, and switch control over the high-pressure main loop stop valve assembly is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas engine intake systems, in particular to a gas pressure reducing valve with a pilot gas cut-off valve. Background Art

[0002] The pressure at the intake end of a gas engine needs to be controlled within a certain pressure range, and currently a gas pressure reducing valve is used for control. For example, the utility model patent with the authorization announcement number CN219974649U discloses a gas pressure reducing valve, which uses a cut-off valve assembly to control the intake condition of the gas pressure reducing valve intake end. The pressure reducing valve assembly adopts direct-acting control. When the high-pressure main circuit is working, the cut-off valve assembly needs greater power and electromagnetic force to open, and is bulky and consumes high power. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the shortcomings of the prior art that the shut-off valve assembly needs greater power and electromagnetic force to open, is bulky, and has high power consumption, the utility model provides a gas pressure reducing valve with a pilot gas shut-off valve.

[0004] The utility model solves the technical problem by adopting the following technical solution: a gas pressure reducing valve with a pilot gas shut-off valve, comprising a valve seat, a valve cover and a piston assembly arranged in the valve seat and the valve cover, wherein the valve seat is provided with an air inlet and an air outlet, and a shut-off valve assembly is arranged on an air inlet passage connecting the air inlet and the piston assembly, the shut-off valve assembly is used to control the shut-off of the internal air flow of the pressure reducing valve, and a three-way solenoid valve assembly is arranged in the valve seat on one side of the shut-off valve assembly. The three-way solenoid valve assembly has an air inlet, a second air outlet and a third air outlet. The high-pressure gas entering from the air inlet joint is connected to the air inlet of the three-way solenoid valve assembly through a first process hole arranged in the valve seat, the third air outlet is connected to the back of the cut-off valve assembly through a second process hole arranged in the valve seat, and the second air outlet is connected to the air outlet through the third process hole arranged in the valve seat; the cut-off valve assembly and the three-way solenoid valve assembly are sealed in the cut-off valve cavity and the solenoid valve cavity of the valve seat through a side cover, and there is also an electrical connector on the side cover, which is electrically connected to the wiring terminal of the three-way solenoid valve assembly for connecting the power supply required for the operation of the three-way solenoid valve assembly.

[0005] Furthermore, the three-way solenoid valve assembly includes an upper shell, a lower shell, a coil assembly, a valve core assembly, a sealing seat and a first return spring of the solenoid valve, wherein the upper shell and the lower shell are both hollow structures, and the open ends are engaged with each other, the coil assembly is arranged inside the upper shell and the lower shell, the coil assembly includes a coil and a coil skeleton, an opening is axially arranged inside the coil skeleton, a spring guide column is arranged inside the upper shell, a valve core seat is arranged inside the lower shell, the valve core seat is an annular sleeve structure, the spring guide column and the valve core seat are respectively inserted into the opening of the coil skeleton from the upper and lower ends; an air inlet hole is axially arranged inside the spring guide column, the valve core assembly is arranged in the inner hole of the valve core seat, and can move axially in the valve core seat, the upper end of the valve core assembly is directly opposite to the air inlet hole of the spring guide column, and the opening and closing of the air inlet hole are controlled by the axial movement of the valve core assembly in the valve core seat; The upper end of the first return spring of the solenoid valve is sleeved on the spring guide column and the end is abutted on the coil frame of the coil assembly. The lower end of the first return spring of the solenoid valve is connected to the spring fixing seat, and the spring fixing seat is fixedly sleeved on the upper end of the valve core assembly. A plurality of first air outlets are circumferentially arranged on the lower shell of the outer periphery of the valve core seat, and the first air outlet and the air inlet are communicated through the air flow channel arranged between the coil frame and the valve core seat. The sealing seat is sealed at the bottom of the lower shell, and a first buffer cavity is formed between the sealing seat and the valve core seat. A second air outlet is arranged in the middle of the sealing seat, and the second air outlet is directly opposite to the lower end of the valve core assembly. An annular column is arranged on the upper end of the second air outlet, and the annular column can abut on the first sealing pad at the lower end of the valve core assembly. A plurality of third air outlets are distributed circumferentially around the outer periphery of the second air outlet, and the first air outlet is communicated with the third air outlet through the first buffer cavity. A second buffer cavity is arranged between the coil frame above the first air outlet and the lower shell.

[0006] Furthermore, the air inlet hole is a two-stage stepped hole, the aperture decreases along the airflow direction, including a first stage aperture and a second stage aperture, and the second stage aperture is 1 / 4-2 / 3 of the first stage aperture. The diameter of the air inlet hole is relatively small, and even under high pressure, the force of the gas on the valve core is relatively small, so that the solenoid valve only needs a small electromagnetic force to overcome the gas pressure and the reset spring force to realize the opening and closing of the solenoid valve.

[0007] Furthermore, the valve core assembly includes an armature, a second return spring of the solenoid valve, a first sealing gasket and a second sealing gasket. A through hole is provided inside the armature, and the second return spring of the solenoid valve is placed in the through hole. A first gasket groove is provided at one end of the through hole, and a second gasket groove is provided at the other end. The first gasket is provided in the first gasket groove, and the second gasket is provided in the second gasket groove. Both ends of the second return spring of the solenoid valve are respectively against the first gasket and the second gasket. The outer diameters of the first gasket groove and the second gasket groove are larger than the diameters of the through hole, so that the first gasket and the second gasket can be confined in the gasket groove to achieve positioning.

[0008] In order to achieve the abutment of the first return spring of the solenoid valve, specifically, a first annular boss is provided on the inner wall of the coil skeleton, and the first return spring of the solenoid valve abuts on the first annular boss.

[0009] Furthermore, in order to achieve electrical connection, it also includes a wiring terminal, which is two in number and one end of which is embedded inwardly from one side of the upper shell into the coil frame of the coil assembly, and the wiring terminal is electrically connected to the coil.

[0010] Furthermore, in order to achieve the sealing of the three-way solenoid valve assembly, the three-way solenoid valve assembly also includes a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring and a fifth sealing ring. The first sealing ring is arranged on the lower end surface of the sealing seat to achieve the sealing between the sealing seat and the contact surface of the side cover; the second sealing ring is arranged on the lower end surface of the lower shell body, and the second sealing ring is concentrically arranged on the outside of the first sealing ring to achieve the sealing between the contact surface of the lower shell body and the side cover; the third sealing ring is arranged on the contact surface between the lower end of the coil skeleton and the lower shell body; the fourth sealing ring is arranged on the contact surface between the upper end of the coil skeleton and the spring guide column of the upper shell body; the fifth sealing ring is arranged on the periphery of the air inlet hole to achieve the air intake sealing.

[0011] Furthermore, the cut-off valve assembly and the three-way solenoid valve assembly are arranged in the same direction in the valve seat, including a cut-off valve core, a cut-off valve return spring, a sealing buffer pad and a locking screw. The cut-off valve core is embedded in the cut-off valve cavity of the valve seat, and the cut-off valve cavity is connected to the air inlet channel. The back of the cut-off valve core is sealed with a side cover, and the cut-off valve return spring is arranged between the cut-off valve core and the side cover, and the two ends are respectively abutted against the back of the cut-off valve core and the inner side of the side cover; the inner end of the cut-off valve core is provided with a sealing buffer pad, and the sealing buffer pad is fixed to the cut-off valve core by a locking screw. Compared with the cut-off valve assembly disclosed in the utility model patent with authorization announcement number CN219974649U, the cut-off valve assembly of the utility model greatly simplifies the structural setting, reduces the volume occupied by the cut-off valve assembly, and has a simpler control method.

[0012] Furthermore, the cut-off valve core is a two-stage stepped structure, and the corresponding cut-off valve cavity is also a stepped structure corresponding to the shape of the cut-off valve core. The step structure can effectively limit the stroke of the cut-off valve core, thereby ensuring control accuracy.

[0013] Furthermore, in order to achieve sealing of the cut-off valve assembly, it also includes a sixth sealing ring. The sixth sealing ring is multiple and is arranged between the contact surface of the cut-off valve core side wall close to the cut-off valve return spring and the inner wall of the cut-off valve cavity to achieve sealing between the cut-off valve core and the cut-off valve cavity.

[0014] The beneficial effects of the utility model are as follows: the utility model provides a gas pressure reducing valve with a pilot gas shut-off valve, which adds a three-way solenoid valve assembly. Through the independent two-position three-way solenoid valve design, only a very small electromagnetic force is required to control the switch of the valve core, thereby controlling the direction of the airflow, and realizing the control of the switch of the high-pressure main circuit shut-off valve assembly, and has the characteristics of low power consumption, high integration, and compact size. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the gas pressure reducing valve of the utility model.

[0017] Figure 2 It is a side structural schematic diagram of the utility model gas pressure reducing valve.

[0018] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure of AA.

[0019] Figure 4 It is a main structural schematic diagram of the gas pressure reducing valve of the utility model.

[0020] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of BB.

[0021] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of the cut-off valve assembly.

[0022] Figure 7 It is a three-dimensional structural schematic diagram of a three-way solenoid valve assembly.

[0023] Figure 8 It is a three-dimensional structural schematic diagram of a three-way solenoid valve assembly.

[0024] Fig. 9 It is a side structural diagram of a three-way solenoid valve assembly.

[0025] Fig.10 yes Fig. 9 Schematic diagram of the cross-sectional structure of AA.

[0026] Fig.11 yes Fig. 9 Schematic diagram of the cross-sectional structure of BB.

[0027] Fig.12 It is a structural schematic diagram of the upper shell.

[0028] Fig.13 It is a schematic diagram of the top structure of the upper shell.

[0029] Fig.14 yes Fig.13 Schematic diagram of the cross-sectional structure of CC.

[0030] Fig.15 It is a schematic diagram of the structure of the lower shell.

[0031] Fig.16 It is a schematic diagram of the structure of the lower shell.

[0032] Fig.17 It is a schematic diagram of the cross-sectional structure of the lower shell.

[0033] Fig.18 It is a structural schematic diagram of the sealing seat.

[0034] Fig.19 It is a structural schematic diagram of the sealing seat.

[0035] Fig. 20 It is a schematic diagram of the working principle of the three-way solenoid valve assembly in the gas pressure reducing valve.

[0036] In the figure: 1, valve seat, 1.1, air inlet, 1.2, air outlet, 2, air inlet connector, 3, valve cover, 4, three-way solenoid valve assembly, 4.1, upper shell, 4.1.1, spring guide column, 4.1.2, air inlet hole, 4.1.3, terminal lead hole, 4.1.4, second annular boss, 4.2, lower shell, 4.2.1, valve core seat, 4.2.2, first air outlet, 4.2.3, annular groove, 4.3, coil assembly, 4.3.1, coil, 4.3.2, coil frame, 4.4, sealing seat, 4.4.1, second air outlet, 4.4.2, third air outlet, 4.4.3, sealing ring boss, 4.44, annular column , 4.5, valve core assembly, 4.5.1, armature, 4.5.2, solenoid valve second return spring, 4.5.3, first sealing gasket, 4.5.4, second sealing gasket, 4.6, solenoid valve first return spring, 4.7, first sealing ring, 4.8, second sealing ring, 4.9, third sealing ring, 4.10, fourth sealing ring, 4.11, fifth sealing ring, 4.12, spring fixing seat, 4.13, terminal; 5, side cover, 6, cut-off valve assembly, 6.1, cut-off valve core, 6.2, cut-off valve return spring, 6.3, sealing buffer pad, 6.4, locking screw, 6.5, sixth sealing ring, 7, piston assembly, 8, electrical connector. DETAILED DESCRIPTION

[0037] The present invention is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter for which protection is sought is limited only by the attached claims and their equivalents.

[0038] like Figure 1-Figure 5 As shown, a gas pressure reducing valve with a pilot gas shut-off valve of the utility model comprises a valve seat 1, a valve cover 3 and a piston assembly 7 arranged in the valve seat 1 and the valve cover 3, wherein the valve seat 1 is provided with an air inlet 1.1 and an air outlet 1.2, the air inlet 1.1 is provided with an air inlet joint 2, a shut-off valve assembly 6 is provided on the air inlet passage connecting the air inlet 1.1 and the piston assembly 7, the shut-off valve assembly 6 is used to control the shut-off of the air flow inside the pressure reducing valve, and a three-way solenoid valve assembly 4 is provided in the valve seat 1 on one side of the shut-off valve assembly 6, The three-way solenoid valve assembly 4 has an air inlet 4.1.2, a second air outlet 4.4.1 and a third air outlet 4.4.2. The high-pressure gas entering from the air inlet connector 2 is connected to the air inlet 4.1.2 of the three-way solenoid valve assembly 4 through the first process hole arranged in the valve seat 1, the third air outlet 4.4.2 is connected to the back of the cut-off valve assembly 6 through the second process hole arranged in the valve seat 1, and the second air outlet 4.4.1 is connected to the air outlet 1.2 through the third process hole arranged in the valve seat 1; the cut-off valve assembly 6 and the three-way solenoid valve assembly 4 are sealed in the cut-off valve cavity and the solenoid valve cavity of the valve seat 1 through the side cover 5, and the side cover 5 also has an electrical connector 8, which is electrically connected to the wiring terminal 4.13 of the three-way solenoid valve assembly 4 and is used to connect the power supply required for the operation of the three-way solenoid valve assembly 4.

[0039] like Figure 3 As shown, the figure mainly shows the structural schematic diagram of the piston assembly 7 inside the gas pressure reducing valve. The piston assembly 7 includes a piston cover, a piston, a first return spring, a piston shaft, a second return spring, a diaphragm assembly, a spring support seat and an adjusting screw. The structure and connection relationship of the piston assembly 7 refer to the utility model patent with authorization announcement number CN219974649U. Therefore, this part of the structure will not be repeated here.

[0040] The structure of the valve seat 1 and the valve cover 3 is basically the same as that of the valve seat 1 and the valve cover 3 disclosed in the utility model patent with authorization announcement number CN219974649U, except that the structure of the valve seat 1 is slightly adjusted, and a cut-off valve cavity and a solenoid valve cavity are added to the valve seat 1. The cut-off valve cavity is used to install the cut-off valve assembly 6, and the solenoid valve cavity is used to install the three-way solenoid valve assembly 4. In addition, multiple air flow channels such as the first process hole, the second process hole and the third process hole are also provided in the valve seat 1 to realize the flow of high-pressure gas and the connection between different components. Since the process is a tortuous through hole, its structure is not shown in the figure.

[0041] like Figure 6 As shown, the cut-off valve assembly 6 and the three-way solenoid valve assembly 4 are arranged in the valve seat 1 in the same direction. In this embodiment, both are radially arranged in the valve seat 1, that is, the axes of both are perpendicular to the axis of the pressure reducing valve, including a cut-off valve core 6.1, a cut-off valve return spring 6.2, a sealing buffer pad 6.3 and a locking screw 6.4. The cut-off valve core 6.1 is embedded in the cut-off valve cavity of the valve seat 1, and the cut-off valve cavity is connected to the air inlet channel. The back of the cut-off valve core 6.1 is sealed with a side cover 5, and the cut-off valve return spring 6.2 is arranged between the cut-off valve core 6.1 and the side cover 5, and the two ends are respectively abutted against the back of the cut-off valve core 6.1 and the inner side of the side cover 5; the inner end of the cut-off valve core 6.1 is provided with a sealing buffer pad 6.3, and the sealing buffer pad 6.3 is fixed to the cut-off valve core 6.1 by a locking screw 6.4. Compared with the cut-off valve assembly 6 disclosed in the utility model patent with authorization announcement number CN219974649U, the cut-off valve assembly 6 of the utility model has greatly simplified the structural setting, reduced the volume occupied by the cut-off valve assembly 6, and has a simpler control method. The cut-off valve core 6.1 is a two-stage stepped structure, and its corresponding cut-off valve cavity is also a stepped structure corresponding to the shape of the cut-off valve core 6.1. The step structure can effectively limit the stroke of the cut-off valve core 6.1, thereby ensuring the control accuracy. In order to achieve the sealing of the cut-off valve assembly 6, it also includes a sixth sealing ring 6.5, and the sixth sealing ring 6.5 is multiple and is arranged between the contact surface of the side wall of the cut-off valve core 6.1 and the inner wall of the cut-off valve cavity near the side of the cut-off valve reset spring 6.2 to achieve the sealing between the cut-off valve core 6.1 and the cut-off valve cavity.

[0042] like Figure 7-Figure 19As shown, the three-way solenoid valve assembly 4 includes an upper shell 4.1, a lower shell 4.2, a coil assembly 4.3, a valve core assembly 4.5, a sealing seat 4.4 and a first return spring 4.6 of the solenoid valve, wherein the upper shell 4.1 and the lower shell 4.2 are both hollow structures, and the open ends are engaged with each other, the coil assembly 4.3 is arranged inside the upper shell 4.1 and the lower shell 4.2, the coil assembly 4.3 includes a coil 4.3.1 and a coil skeleton 4.3.2, the coil 4.3.1 is wound around the outside of the coil skeleton 4.3.2, and the coil skeleton 4.3.2 is provided with an opening along the axial direction, the upper shell 4.1 is provided with a spring guide column 4.1.1, the lower shell 4.2 is provided with a valve core seat 4.2.1, the valve core seat 4.2.1 is an annular sleeve structure, the spring guide column 4.1.1 and the valve core seat 4.2.1 are respectively inserted from the upper and lower ends. The air inlet hole 4.1.2 is axially arranged in the spring guide column 4.1.1, the valve core assembly 4.5 is arranged in the inner hole of the valve core seat 4.2.1, and can move axially in the valve core seat 4.2.1, the upper end of the valve core assembly 4.5 is directly opposite to the air inlet hole 4.1.2 of the spring guide column 4.1.1, and the opening and closing of the air inlet hole 4.1.2 is controlled by the axial movement of the valve core assembly 4.5 in the valve core seat 4.2.1; the upper end of the first return spring 4.6 of the solenoid valve is sleeved on the spring guide column 4.1.1 and the end portion abuts on the coil skeleton 4.3.2 of the coil assembly 4.3. In order to achieve the abutment of the first return spring 4.6 of the solenoid valve, specifically, a first annular boss is provided on the inner wall of the coil skeleton 4.3.2, and the first return spring 4.6 of the solenoid valve abuts on the first annular boss. The lower end of the first return spring 4.6 of the solenoid valve is connected to the spring fixing seat 4.12, and the spring fixing seat 4.12 is fixedly sleeved on the upper end of the valve core assembly 4.5; a plurality of first air outlet holes 4.2.2 are circumferentially arranged on the lower shell 4.2 outside the valve core seat 4.2.1, and the first air outlet holes 4.2.2 and the air inlet holes 4.1.2 are connected through the air flow channel arranged between the coil skeleton 4.3.2 and the valve core seat 4.2.1; the sealing seat 4.4 is sealed at the bottom of the lower shell 4.2, and the sealing seat 4.4 is connected to the valve core seat 4.2.1. A first buffer cavity is formed between the sealing seat 4.4, a second air outlet 4.4.1 is provided in the middle of the sealing seat 4.4, the second air outlet 4.4.1 is directly opposite to the lower end of the valve core assembly 4.5, an annular column 4.4.4 is provided at the upper end of the second air outlet 4.4.1, and the annular column 4.4.4 can be pressed against the first sealing pad 4.5.3 at the lower end of the valve core assembly 4.5, a plurality of third air outlets 4.4.2 are distributed circumferentially around the periphery of the second air outlet 4.4.1, and the first air outlet 4.2.2 is connected to the third air outlet 4.4.2 through the first buffer cavity. A second buffer cavity is provided between the coil frame 4.3.2 above the first air outlet 4.2.2 and the lower shell 4.2.

[0043] like Fig.10As shown, the valve core assembly 4.5 includes an armature 4.5.1, a second return spring 4.5.2 of the solenoid valve, a first sealing gasket 4.5.3 and a second sealing gasket 4.5.4. A through hole is provided inside the armature 4.5.1, and the second return spring 4.5.2 of the solenoid valve is placed in the through hole. One end of the through hole is provided with a first gasket groove, and the other end is provided with a second gasket groove. The first gasket 4.5.3 is arranged in the first gasket groove, and the second gasket 4.5.4 is arranged in the second gasket groove, and the two ends of the second return spring 4.5.2 of the solenoid valve are respectively against the first gasket 4.5.3 and the second gasket 4.5.4. The outer diameters of the first gasket groove and the second gasket groove are larger than the diameters of the through hole, so that the first gasket 4.5.3 and the second gasket 4.5.4 can be restricted in the gasket groove to achieve positioning. In order to achieve the sealing of the three-way solenoid valve assembly 4, the three-way solenoid valve assembly 4 also includes a first sealing ring 4.7, a second sealing ring 4.8, a third sealing ring 4.9, a fourth sealing ring 4.10 and a fifth sealing ring 4.11. The first sealing ring 4.7 is arranged on the lower end surface of the sealing seat 4.4 to achieve the sealing between the sealing seat 4.4 and the external contact component installed thereon. In order to achieve the installation of the first sealing ring 4.7, a sealing ring boss 4.4.3 is arranged on the periphery of the second air outlet 4.4.1 below the sealing seat 4.4, and the first sealing ring 4.7 is installed on the outside of the sealing ring boss 4.4.3. The second sealing ring 4.8 is arranged on the lower end surface of the lower shell 4.2, and the second sealing ring 4.8 is concentrically arranged on the outside of the first sealing ring 4.7 to achieve the sealing between the contact surface of the lower shell 4.2 and the side cover 5; in order to achieve the installation of the second sealing ring 4.8, an annular groove 4.2.3 is arranged on the bottom surface of the lower shell, and the second sealing ring 4.8 is embedded in the annular groove 4.2.3. The third sealing ring 4.9 is arranged on the contact surface between the lower end of the coil skeleton 4.3.2 and the lower shell 4.2, and is used to achieve the sealing between the coil skeleton 4.3.2 and the lower shell 4.2, so as to prevent the gas in the air flow channel from entering the coil side from between the coil skeleton 4.3.2 and the lower shell 4.2, thereby affecting its working effect. The fourth sealing ring 4.10 is arranged on the contact surface between the upper end of the coil skeleton 4.3.2 and the spring guide column 4.1.1 of the upper shell 4.1, and is used to achieve the sealing between the coil skeleton 4.3.2 and the upper shell 4.1. In order to achieve the installation of the fourth sealing ring 4.10, the outer wall of the spring guide column 4.1.1 of the upper shell 4.1 is provided with a second annular boss 4.1.4, and the coil skeleton 4.3.2 is provided with a third annular boss, and the second annular boss 4.1.4 is complementary to the third annular boss, and together surrounds the installation cavity of the fourth sealing ring 4.10. The fifth sealing ring 4.11 is arranged on the periphery of the air inlet 4.1.2, and is used to achieve air inlet sealing. A second buffer cavity is provided between the coil frame 4.3.2 above the first air outlet 4.2.2 and the lower shell 4.2. The second buffer cavity is used to connect the first air outlet 4.2.2 and the air flow channel to buffer and store the air flow.

[0044] like Fig.14 As shown, the air inlet hole 4.1.2 is a two-stage stepped hole, the aperture decreases along the air flow direction, including a first stage aperture and a second stage aperture, and the second stage aperture is 1 / 4-2 / 3 of the first stage aperture. The diameter of the air inlet hole 4.1.2 is relatively small, and even under high pressure, the force of the gas on the valve core is relatively small, so the solenoid valve only needs a small electromagnetic force to overcome the gas pressure and the reset spring force to realize the opening and closing of the solenoid valve.

[0045] like Fig.11 and Fig.14 As shown, in order to achieve electrical connection, it also includes a connection terminal 4.13, which is two in number, and one end of which is embedded inwardly from a terminal lead-out hole 4.1.3 on one side of the upper shell 4.1 into the coil skeleton 4.3.2 of the coil assembly 4.3, and the connection terminal 4.13 is electrically connected to the coil. There are also two terminal lead-out holes 4.1.3, matching the number of the connection terminals 4.13.

[0046] Working principle:

[0047] like Fig. 20 As shown, when the coil assembly 4.3 of the three-way solenoid valve assembly 4 is not energized, the high-pressure gas runs along the path of the red line. Specifically, the high-pressure gas entering from the gas pressure reducing valve inlet joint 2 passes through the first process hole inside the valve seat 1 to reach the inlet hole 4.1.2 of the three-way solenoid valve assembly 4; at this time, the valve core assembly 4.5 of the three-way solenoid valve assembly 4 moves downward to the bottom of the valve core seat 4.2.1 under the action of the first return spring 4.6 of the solenoid valve, and the first sealing gasket 4.5.3 at the lower end of the valve core assembly 4.5 abuts against the annular column 4.4.4 to block the second outlet hole 4.4.1, and the second sealing gasket 4.5.4 at the upper end of the valve core assembly 4.5 is separated from the inlet hole 4.1.2 The air inlet 4.1.2 is opened, and the high-pressure gas enters from the air inlet 4.1.2, and then flows out of the three-way solenoid valve assembly 4 through the air flow channel between the coil skeleton 4.3.2 and the valve core seat 4.2.1, the second buffer cavity, the first air outlet 4.2.2, the first buffer cavity, and the third air outlet 4.4.2, and then reaches the back of the cut-off valve assembly 6 (i.e., the side of the cut-off valve reset spring 6.2) through the second process hole in the valve seat 1. The cut-off valve core 6.1 is closed under the action of the pressure difference and the cut-off valve reset spring 6.2, thereby cutting off the air inlet 1.1 and the air inlet channel of the gas pressure reducing valve. At this time, the external high-pressure gas cannot enter the gas pressure reducing valve, thereby realizing the cut-off of the gas pressure reducing valve.

[0048] When the coil assembly 4.3 is energized to generate electromagnetic force to drive the valve core assembly 4.5 to move upward, the air inlet 4.1.2 is blocked by the second sealing gasket 4.5.4 at the upper end of the valve core assembly 4.5. At this time, the high-pressure gas cannot enter from the air inlet 4.1.2, and the air inlet 4.1.2 of the three-way solenoid valve assembly 4 is cut off from the air inlet 1.1 of the gas pressure reducing valve; due to the upward movement of the valve core assembly 4.5, the first sealing gasket 4.5.3 at the lower end of the valve core assembly 4.5 and the annular column at the upper end of the second air outlet 4.4.1 are 4.4.4 is separated, and the second outlet hole 4.4.1 and the third outlet hole 4.4.2 are connected through the first buffer chamber. The high-pressure gas on the back of the cut-off valve assembly 6 is depressurized through the three-way solenoid valve assembly 4, and the gas flows to the outlet end of the gas pressure reducing valve through the third process hole. The cut-off valve core 6.1 of the cut-off valve assembly 6 overcomes the elastic force of the cut-off valve reset spring 6.2 under the reverse high-pressure push and is opened, so that the gas pressure reducing valve inlet 1.1 is connected with the inlet channel, thereby realizing the connection of the gas pressure reducing valve and normal operation. The blue arrow indicates the running direction of the airflow when the three-way solenoid valve assembly 4 is energized.

[0049] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gas pressure reducing valve with a pilot gas shut-off valve, characterized in that: The venting device of the present invention is a kind of air filter device, and the air filter element of the present invention is a kind of air filter element of the present invention, and the air filter element of the present invention is a kind of air filter element of the present invention.

2. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 1, characterized in that: The three-way solenoid valve assembly comprises an upper shell, a lower shell, a coil assembly, a valve core assembly, a sealing seat and a first return spring of the solenoid valve, wherein the upper shell and the lower shell are both hollow structures, and the open ends are engaged with each other, the coil assembly is arranged inside the upper shell and the lower shell, the coil assembly comprises a coil and a coil skeleton, an opening is axially arranged inside the coil skeleton, a spring guide column is arranged inside the upper shell, a valve core seat is arranged inside the lower shell, the spring guide column and the valve core seat are respectively inserted into the opening of the coil skeleton from the upper and lower ends; an air inlet hole is axially arranged inside the spring guide column, the valve core assembly is arranged in the inner hole of the valve core seat, and can move axially in the valve core seat, the upper end of the valve core assembly is directly opposite to the air inlet hole of the spring guide column, the upper end of the first return spring of the solenoid valve is sleeved on the spring guide column and the end thereof abuts against Connected to the coil skeleton of the coil assembly, the lower end of the first return spring of the solenoid valve is connected to the spring fixing seat, and the spring fixing seat is fixedly sleeved on the upper end of the valve core assembly; a plurality of first air outlets are circumferentially arranged on the lower shell body outside the valve core seat, and the first air outlet and the air inlet are connected through the air flow channel arranged between the coil skeleton and the valve core seat; the sealing seat is sealed at the bottom of the lower shell body, and a first buffer cavity is formed between the sealing seat and the valve core seat, a second air outlet is arranged in the middle of the sealing seat, the second air outlet is directly opposite to the lower end of the valve core assembly, an annular column is arranged at the upper end of the second air outlet, and the annular column can be used to abut against the first sealing gasket at the lower end of the valve core assembly, a plurality of third air outlets are circumferentially distributed around the second air outlet, and the first air outlet is connected to the third air outlet through the first buffer cavity.

3. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 2, characterized in that: The air inlet hole is a two-stage stepped hole, the aperture decreases along the airflow direction, and the aperture of the second stage is 1 / 4-2 / 3 of the aperture of the first stage.

4. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 2, characterized in that: The valve core assembly includes an armature, a second return spring of the solenoid valve, a first sealing gasket and a second sealing gasket. A through hole is provided inside the armature, and the second return spring of the solenoid valve is placed in the through hole. A first gasket groove is provided at one end of the through hole, and a second gasket groove is provided at the other end. The first sealing gasket is arranged in the first gasket groove, and the second sealing gasket is arranged in the second gasket groove, and both ends of the second return spring of the solenoid valve are respectively against the first sealing gasket and the second sealing gasket.

5. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 2, characterized in that: A first annular boss is provided on the inner wall of the coil frame, and a first return spring of the solenoid valve abuts against the first annular boss.

6. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 2, characterized in that: It also includes two connection terminals, one end of which is embedded inwardly from one side of the upper shell into the coil frame of the coil assembly, and the connection terminal is electrically connected to the coil.

7. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 2, characterized in that: The three-way solenoid valve assembly also includes a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring and a fifth sealing ring. The first sealing ring is arranged on the lower end surface of the sealing seat to achieve sealing between the sealing seat and the contact surface of the side cover; the second sealing ring is arranged on the lower end surface of the lower shell, and the second sealing ring is concentrically arranged on the outside of the first sealing ring to achieve sealing between the contact surface of the lower shell and the side cover; the third sealing ring is arranged on the contact surface between the lower end of the coil skeleton and the lower shell; the fourth sealing ring is arranged on the contact surface between the upper end of the coil skeleton and the spring guide column of the upper shell; the fifth sealing ring is arranged on the periphery of the air inlet hole to achieve air intake sealing.

8. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 1, characterized in that: The cut-off valve assembly and the three-way solenoid valve assembly are arranged in the same direction in the valve seat, including a cut-off valve core, a cut-off valve return spring, a sealing buffer pad and a locking screw. The cut-off valve core is embedded in the cut-off valve cavity of the valve seat, and the cut-off valve cavity is connected to the air inlet channel. The back of the cut-off valve core is sealed with a side cover, and the cut-off valve return spring is arranged between the cut-off valve core and the side cover, and the two ends are respectively abutted against the back of the cut-off valve core and the inner side of the side cover; the inner end of the cut-off valve core is provided with a sealing buffer pad, and the sealing buffer pad is fixed to the cut-off valve core by a locking screw.

9. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 8, characterized in that: The cut-off valve core is a two-stage stepped structure, and its corresponding cut-off valve cavity is also a stepped structure corresponding to the shape of the cut-off valve core.

10. The gas pressure reducing valve with a pilot gas shut-off valve according to claim 8, characterized in that: It also includes a sixth sealing ring, which is multiple and is arranged between the contact surface of the cut-off valve core side wall close to the cut-off valve reset spring and the inner wall of the cut-off valve cavity to achieve sealing between the cut-off valve core and the cut-off valve cavity.

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