CN214578895U

CN214578895U - Proportional pressure control electromagnetic valve and natural gas engine gas supply pressure reducing and regulating device

Info

Publication number: CN214578895U
Application number: CN202022903677.XU
Authority: CN
Inventors: 辛超超; 于建锋; 刘洋
Original assignee: Shanghai Junfeng Electric Control Technology Co Ltd
Current assignee: Junfeng Electric Control Technology Taizhou Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-11-02
Anticipated expiration: 2030-12-03

Abstract

The utility model discloses a proportional pressure control solenoid valve, include: the valve body assembly comprises a valve body, a flow control component and a driving piece, the valve body comprises a valve port shell, a valve cover, a magnetism isolating ring and a pole shoe, the flow control component is installed at one end of the valve port shell, an oil inlet and an oil outlet are formed in the valve port shell, the other end of the valve port shell, the magnetism isolating ring and the pole shoe are sequentially and fixedly connected to form a closed space, the driving piece is installed in the closed space, and the driving piece is abutted to the flow control component; and the coil assembly is sleeved outside the closed space and drives the driving piece to move back and forth.

Description

Proportional pressure control electromagnetic valve and natural gas engine gas supply pressure reducing and regulating device

Technical Field

The utility model relates to a solenoid valve technical field especially relates to a proportional pressure control solenoid valve and natural gas engine gas supply decompression voltage regulator.

Background

The national requirements for the emission standard of automobiles are more and more strict, and the cost of gasoline and diesel engines is increased along with the strictness. In addition, people have higher and higher requirements on air quality, and clean energy represented by natural gas is one of the directions for solving the problems. Natural gas as a high-quality automobile engine fuel, CH contained in natural gas₄The value is more than 90 percent, and the method is widely applicable to various types of automobiles. The natural gas vehicle has the characteristics of energy conservation, emission reduction, high efficiency and the like, and is widely applied.

The gas supply system of the existing dual-fuel engine mainly comprises a pressure reducing and regulating device, a gas rail and a nozzle. The pressure reducing and regulating device generally adopts a mechanical pressure regulator, the gas after pressure reduction and regulation directly reaches the gas rail, and the gas is accurately metered by a nozzle and enters the inside of the engine, and at the moment, the pressure regulator is used for realizing low-pressure establishment and gas rail pressure regulation. The transient response of a pressure reducing regulator (which is the same, mechanical) is related to its internal moving parts (sensitivity of the diaphragm, spring control accuracy). When the vehicle accelerates or decelerates, a larger or smaller flow is output instantly, the output pressure value rises or falls instantly to be larger, the output pressure fluctuation is larger, the control precision of the output pressure is poorer, and the injection precision of the nozzle is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a proportional pressure control solenoid valve of natural gas engine to solve the pressure adjustment of the gas that exists among the correlation technique and the problem of accurate measurement at least.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

according to the utility model discloses an aspect provides a proportional pressure control solenoid valve, include: the valve body assembly comprises a valve body, a flow control component and a driving piece, the valve body comprises a valve port shell, a valve cover, a magnetism isolating ring and a pole shoe, the flow control component is installed at one end of the valve port shell, an oil inlet and an oil outlet are formed in the valve port shell, the other end of the valve port shell, the magnetism isolating ring and the pole shoe are sequentially and fixedly connected to form a closed space, the driving piece is installed in the closed space, and the driving piece is abutted to the flow control component; and the coil assembly is sleeved outside the closed space and drives the driving piece to move back and forth.

And the valve body assembly and the coil assembly are assembled and then combined into a whole through the connecting part.

Furthermore, the driving piece comprises a guide rod, an armature and a spring, the armature is fixed on the guide rod, one end of the spring props against the armature, and the other end of the spring props against the pole shoe.

Furthermore, both ends of the guide rod are respectively supported on the valve port shell and the pole shoe through guide sleeves.

Furthermore, the device also comprises a guide positioning assembly, wherein the guide positioning assembly is arranged in the closed space and is used for positioning the stroke of the driving piece.

Furthermore, the guiding and positioning assembly comprises a left limit ring and a right limit ring, the left limit ring is installed in the valve port shell and located on one side of the driving element, and the right limit ring is installed in the pole shoe and located on the other side of the driving element.

Further, the flow control assembly comprises a valve seat, a steel ball and a valve cover, the valve seat is installed in the valve port shell, an inlet is formed in the valve seat, the steel ball is installed in the inlet of the valve seat, and the valve cover is installed at the end of the valve port shell and attached to the valve seat.

Further, the inlet is of an inclined hole structure.

Further, the coil assembly comprises a shell, a gasket, a framework component and a coil plastic package, wherein the framework component is installed in an inner cavity of the shell, the gasket is pressed into the shell to form interference connection, and the shell, the gasket and the framework component are wrapped into a whole through the plastic package.

According to the utility model discloses the second aspect of embodiment provides a natural gas engine gas supply decompression pressure regulator, a serial communication port, including the first aspect a proportional pressure control solenoid valve.

According to the technical scheme, the utility model discloses beneficial effect as follows: the valve body adopts an integrally closed structure, except for the oil inlet and the oil outlet, the other end of the valve port shell, the magnetic isolation ring and the pole shoe are fixedly connected in sequence to form a closed space, the joint with the outside is two welding seams, and compared with a sealing ring, the air tightness of the welding seams is greatly improved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a cross-sectional view of a proportional pressure control solenoid valve provided in embodiment 1 of the present invention;

fig. 2 is a schematic view of the inclined hole structure in embodiment 1 of the present invention;

the reference numerals in the figures are as follows: 01. the valve comprises a valve cover 02, a valve seat 03, an O-shaped ring 04, a valve port shell 05, external threads 06, a left limit ring 07, a coil plastic-coated ring 08, a shell 09, a magnetism isolating ring 10, a right limit ring 11, a connector 12, a rubber gasket 13, a nut 14, a pole shoe 15, an O-shaped ring 16, a gasket 17, a right guide sleeve 18, a spring 19, a guide rod 20, an armature 21, a left guide sleeve 22, an O-shaped ring 23, an O-shaped ring 24, an O-shaped ring 25, an O-shaped ring 26 and a steel ball.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1:

as shown in fig. 1, the present embodiment provides a proportional pressure control solenoid valve including: the valve body assembly comprises a valve body, a flow control component and a driving piece, the valve body comprises a valve port shell 04, a valve cover 01, a magnetic isolation ring 09 and a pole shoe 14, the flow control component is installed at one end of the valve port shell 04, an oil inlet and an oil outlet are formed in the valve port shell 04, the other end of the valve port shell 04, the magnetic isolation ring 09 and the pole shoe 14 are sequentially and fixedly connected to form a closed space, the driving piece is installed in the closed space, and the driving piece is abutted to the flow control component; and the coil assembly is sleeved outside the closed space and drives the driving piece to move back and forth.

The valve body is of an integrally closed structure, except for the oil inlet and the oil outlet, the other end of the valve port shell 04, the magnetic isolation ring 09 and the pole shoe 14 are fixedly connected in sequence to form a closed space, the fixed connection mode generally adopts a welding mode, so that two welding seams are formed at the connection part with the outside, and compared with a sealing ring, the air tightness of the welding seams is greatly improved. The valve body adopts a laser welding process, two welding seams are formed in total, and the magnetism isolating ring is respectively welded with the pole shoe and the valve port shell.

In this example, the valve cap 01 may be assembled by interference press fitting, clearance fitting, welding, or the like. The valve body adopts an integrated closed structure, the use of a sealing ring is avoided, the air tightness is enhanced, and the guiding precision of the armature is improved. The valve body adopts a welding process, so that the structural strength requirement can be ensured, and the air tightness requirement can be met. The magnetism isolating ring 09 is made of a non-soft magnetic material or a weak magnetic material.

In this embodiment, the valve body assembly further comprises a connecting portion, and the valve body assembly and the coil assembly are assembled and then combined into a whole through the connecting portion. The valve body assembly and the coil assembly are mutually independent, and are combined into a whole through the connecting part after being assembled respectively.

In this embodiment, the driving member includes a guide rod 19, an armature 20 and a spring 18, the armature 20 is fixed on the guide rod 19, the armature is made of soft magnetic material and does not directly participate in the guiding, but is guided by the guide rod 19, one end of the spring 18 abuts against the armature 20, and the other end abuts against the pole piece 14. When the spring 18 works, the spring force, the gas pressure at the two sides of the steel ball and the electromagnetic force are in a balanced state. The right end of the armature and the left end of the pole shoe have a spring guiding and positioning structure, when the spring is compressed, the axial direction is always on the same straight line, and the spring force does not have large fluctuation in the whole compression or extension process.

In this embodiment, both ends of the guide rod 19 are supported on the valve port housing 04 and the pole piece 14 through guide sleeves, respectively. The guide bar is one of the key parts of the guide function, and guides through a tiny gap between the guide bar and the guide sleeve, the single side of the gap is 0.05mm, the guide precision is guaranteed, and the guide reliability can be guaranteed. The guide sleeve is made of high-wear-resistance and high-lubricity nylon material. The guide sleeve and the mounting hole are in interference fit. The guide sleeve inner hole adopts the square with the side length of 3mm, and the cavity formed inside is prevented from being compressed due to the moving air of the guide rod on the premise of ensuring the guiding, so that the movement of the guide rod is inhibited. The motion guide adopts a guide rod and a double guide sleeve, so that the problem that the armature is directly involved in the guide to cause the abrasion of the armature is avoided, meanwhile, the armature does not participate in the guide, an abrasion-resistant coating is not required to be added, and the cost is reduced. The armature and the guide rod can adopt an interference assembly mode, and the middle protruding part of the guide rod is in interference fit with the inner hole of the armature.

In this embodiment, the device further comprises a guiding and positioning assembly, wherein the guiding and positioning assembly is installed in the closed space and used for positioning the stroke of the driving piece. Specifically, the guiding and positioning assembly comprises a left limit ring 06 and a right limit ring 10, the left limit ring 06 is installed in the valve port housing 04 and located on one side of the driving member, and the right limit ring 10 is installed in the pole shoe 14 and located on the other side of the driving member. The left limit ring 06 and the right limit ring 10 at two ends of the armature are used for realizing positioning, and the limit rings are made of non-soft magnetic materials and can bear the back-and-forth impact of the armature. The distance between the armature and the left end face of the inner cavity of the valve port shell 01 is effectively limited through the left limiting ring 06, the distance between the armature and the right end face of the inner cavity of the pole shoe is effectively limited through the right limiting ring 10, the electromagnetic force is guaranteed not to be increased sharply along with the reduction of a working air gap, and meanwhile, the spring is guaranteed not to lose efficacy due to overlarge compression amount.

In this embodiment, the flow control assembly includes a valve seat 02, a steel ball 26, and a valve cover 01, the valve seat 02 is installed in the valve port housing 04, an inlet is formed on the valve seat 02, the steel ball 26 is installed in the inlet of the valve seat 18, and the valve cover 01 is installed at an end of the valve port housing 04 and is attached to the valve seat 02. The valve seat 02 is a key component of flow control. In this example, the inlet is of an inclined hole structure, as shown in fig. 2, 3 inclined hole structures are shown in the figure, or 2 or more than 3 inclined hole structures are shown in the figure, so that the stability of gas flow at the moment of opening is ensured, the flow disturbance phenomenon is avoided, the linear change rule of a flow curve is ensured to be in a good range, and the smooth rising of the flow is ensured. The valve gap adopts non-soft magnetic material, and the pressure equipment is gone into valve port casing 04, and grinding process is adopted on the excircle surface, reduces the degree of difficulty of pressure equipment, reduces the appearance of small impurity.

In this embodiment, the coil assembly includes casing 08, gasket 16, skeleton subassembly and coil package and moulds 07, and the skeleton subassembly is packed into casing 08 inner chamber, and gasket 16 is pressed into casing 08 and is formed interference fit, and is moulded to wrap casing 08, gasket 16 and skeleton subassembly through the package and is wrapped up into an organic whole, and the package is moulded and can be adopted partial parcel casing. The framework component comprises a framework, an enameled wire, an adhesive tape and a pin, wherein the enameled wire is wound on the framework, a layer of adhesive tape is wound outside the enameled wire, and the pin is assembled on the framework, wherein the shell 08 is manufactured by adopting a stamping process, and the material is GB DC 05.

In this embodiment, an O-ring 25 is disposed between the valve seat 02 and the valve cover 01, and is used to ensure the tightness of the inlet of the valve port, and when the valve port is closed, the inlet and the outlet are in a strict sealing state. An O-shaped ring (03) is arranged between the valve seat 02 and the valve port shell 04 to ensure the air tightness of the air inlet.

The proportional pressure control solenoid valve is controlled by a PWM signal, when the power is off, the spring 18 directly presses the steel ball 26 on the valve seat 02 on the valve cover 01 through the armature 20, and the valve port is closed through the direct contact of the steel ball and the sealing ring 25. The valve port shut-off pressure is generated by a spring 18. When the coil assembly is energized, the resulting electromagnetic force overcomes the spring force of the spring 18 to push the armature 20 to the right, and the valve port opens. When the input pressure and the output pressure meet the sonic condition, the gas flowing through the valve port can reach the sonic speed. At the moment, the armature stroke and the valve port opening are controlled by the current or the electromagnetic force of the proportional electromagnet coil, and the flow rate and the excitation current are in an ideal linear relationship. The solenoid valve obtains target pressure by receiving an ECU signal of a control system and changing flow rate in proportion under the action of an internal driving force, and the target pressure and the target flow rate are maintained by utilizing a pressure sensor in the air rail. The output pressure is more stable, and larger fluctuation in the air rail is not caused due to the change of working conditions, so that the control of each working condition of the engine is more accurate, and the emission control of the engine is more facilitated.

In addition, the front end of the valve port housing 04 is provided with an external thread 05 for connecting the electromagnetic valve and the pressure regulator through the external thread of the valve body, and the front end and the rear end of the valve port housing 04 are also respectively provided with an O-shaped ring 24 and an O-shaped ring 15. The steps of assembling the solenoid valve to the regulator are as follows: the anti-rust valve is characterized in that firstly, an external thread 05 on the valve body is installed in a mounting hole in the pressure regulator through threaded connection, then the inner wall of a framework of the coil and the outer wall of the valve body are installed together in a shaft hole matched mode, a gasket 16 is installed at the right end of a pole shoe 14, a waterproof and dustproof O-shaped ring 15 is installed, then a rubber gasket 12 is installed, a nut 13 is screwed into the right end of the pole shoe 14, the nut is a locknut, a nut protective sleeve is installed, and the protective sleeve plays a role in protecting the nut from rust and attractiveness.

Example 2:

the embodiment provides a natural gas engine gas supply pressure reducing and regulating device, which comprises the proportional pressure control electromagnetic valve described in embodiment 1. Through the use of the proportional pressure control electromagnetic valve, all effects of the proportional pressure control electromagnetic valve are achieved, the pressure reducer is prevented from outputting large pressure fluctuation, and therefore the problems of pressure regulation and accurate metering of fuel gas are solved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A proportional pressure control solenoid valve, comprising:

the valve body assembly comprises a valve body, a flow control component and a driving piece, the valve body comprises a valve port shell (04), a valve cover (01), a magnetic isolation ring (09) and a pole shoe (14), the flow control component is installed at one end of the valve port shell (04), an oil inlet and an oil outlet are formed in the valve port shell (04), the other end of the valve port shell (04), the magnetic isolation ring (09) and the pole shoe (14) are sequentially and fixedly connected to form a closed space, the driving piece is installed in the closed space, and the driving piece is abutted to the flow control component;

and the coil assembly is sleeved outside the closed space and drives the driving piece to move back and forth.

2. The proportional pressure control solenoid valve of claim 1, further comprising a connecting portion, wherein the valve body assembly and the coil assembly are assembled and integrated into a whole by the connecting portion.

3. A proportional pressure control solenoid according to claim 1, wherein the drive member comprises a guide rod (19), an armature (20) and a spring (18), the armature (20) being fixed to the guide rod (19), one end of the spring (18) bearing against the armature (20) and the other end bearing against the pole piece (14).

4. A proportional pressure control solenoid valve according to claim 3, wherein both ends of the guide rod (19) are supported on the valve port housing (04) and the pole piece (14) through guide sleeves, respectively.

5. The proportional pressure control solenoid of claim 1, further comprising a pilot positioning assembly mounted in said confined space for positioning the stroke of said actuating member.

6. A proportional pressure control solenoid according to claim 5, wherein the pilot positioning assembly comprises a left check ring (06) and a right check ring (10), the left check ring (06) being mounted in the valve port housing (04) on one side of the driver, the right check ring (10) being mounted in the pole piece (14) on the other side of the driver.

7. A proportional pressure control solenoid valve as claimed in claim 1, wherein the flow control assembly comprises a valve seat (02), a steel ball (26), and a valve cover (01), the valve seat (02) is installed in the valve port housing (04), the valve seat (02) is provided with an inlet, the steel ball (26) is installed in the inlet of the valve seat (02), and the valve cover (01) is installed at the end of the valve port housing (04) and is attached to the valve seat (02).

8. The proportional pressure control solenoid of claim 7, wherein said inlet is of a slanted bore configuration.

9. The proportional pressure control solenoid valve of claim 1, wherein the coil assembly comprises a housing (08), a gasket (16), a skeleton component and a coil plastic-coated component (07), the skeleton component is installed in an inner cavity of the housing (08), the gasket (16) is pressed into the housing (08) to form interference connection, and the housing (08), the gasket (16) and the skeleton component are coated into a whole by plastic-coated.

10. A natural gas engine gas supply pressure reducing regulator, characterized in that it comprises a proportional pressure control solenoid valve according to any one of claims 1 to 9.