Pressure regulating valve

Abstract

The utility model relates to a pressure regulating valve. The pressure regulating valve is used for fuel gas and comprises a hollow cylindrical pressure-bearing housing made of a soft magnetic material, and the pressure-bearing housing defines an inner cavity and is provided with a closed end; and the coil device is provided with a coil framework and an electromagnetic coil carried by the coil framework. The coil device is fixedly installed in the inner cavity, and when the pressure regulating valve operates, the coil device is immersed in fuel gas. By installing the coil device in the pressure-bearing housing, high coupling of the electromagnetic coil and the needle valve of the pressure regulating valve can be achieved, and therefore the driving capacity and responsiveness of the pressure regulating valve are improved.

Description

Technical Field

[0001] The present application relates to the technical field of pressure regulating valves for gas. Background Art

[0002] Gas engines use high-pressure gas as fuel. To regulate the pressure of this high-pressure gas, a pressure regulating valve is typically used. Such a valve typically operates at very high inlet pressure. A solenoid-driven needle valve controls the pressure and flow at the outlet, ensuring the gas engine's inlet pressure remains within a specified range, ensuring stable operation and efficient performance.

[0003] In the prior art, for pressure-regulating valves with very high intake pressures, the coil assembly is mounted externally on the valve's pressure housing. However, to withstand the high pressure of the gas, the housing requires a high wall thickness, and the magnetic circuit design requires it to be made of non-magnetic material. Due to the magnetic isolation and wall thickness of the housing, the electromagnetic force of the solenoid coil is significantly reduced, thereby prolonging the response time of the valve stem. Utility Model Content

[0004] The present application provides a pressure-regulating valve for use with gas, comprising: a hollow, cylindrical pressure-bearing housing made of a soft magnetic material, the housing defining an interior cavity and having a closed end; and a coil assembly comprising a coil bobbin and an electromagnetic coil supported by the coil bobbin. The coil assembly is fixedly mounted within the interior cavity and, when the pressure-regulating valve is in operation, is immersed in the gas.

[0005] That is, in this pressure-regulating valve, the coil assembly is no longer mounted outside the pressure-containing housing, but rather inside the housing and immersed in the high-pressure gas within the housing's interior. This submersion of the coil assembly in the high-pressure gas means that not only the coil bobbin of the coil assembly but also the electromagnetic coil of the coil assembly are in direct contact with the high-pressure gas. By securely mounting the coil assembly within the pressure-containing housing and constructing the housing from a soft magnetic material, a high degree of coupling between the electromagnetic coil and the needle valve of the pressure-regulating valve is achieved, thereby improving the valve's actuation capability and responsiveness.

[0006] Optionally, the coil bobbin has a first axial end and a second axial end that are opposite to each other. To securely mount the coil assembly within the pressure housing, the coil assembly rests against the closed end of the pressure housing along the axial direction of the pressure housing at the first axial end, and is secured within the pressure housing along the axial direction at the second axial end by a first securing member secured to the inner circumferential wall of the pressure housing. In this manner, the coil assembly can be securely secured within the pressure housing in a simple and reliable manner, and can also be easily removed from the pressure housing for maintenance.

[0007] Optionally, the pressure regulating valve further comprises an armature made of a soft magnetic material, which is coaxially arranged with the coil assembly and radially inside the coil assembly and fixedly connected to the closed end of the pressure housing.

[0008] Optionally, the pressure regulating valve also includes a valve stem, which has a first end section that is axially slidable on the armature along the armature and a second end section that is operatively connected to the needle valve of the pressure regulating valve, wherein a permanent magnet is arranged in a radial direction between the coil device and the first end section of the valve stem and the permanent magnet is fixed to the first end section of the valve stem, so that the permanent magnet and the valve stem can move axially together.

[0009] Optionally, an end portion of the permanent magnet proximal to the closed end abuts against a flange of the first end section of the valve stem in the axial direction, and an end portion of the permanent magnet distal to the closed end is fixed to the first end section of the valve stem in the axial direction by a second fixing member fixed to an outer peripheral wall of the first end section of the valve stem. In this manner, the permanent magnet can be reliably fixed to the valve stem in a simple manner, and can also be easily removed from the valve stem during maintenance.

[0010] Optionally, the coil device has a coil terminal arranged at the first axial end of the coil skeleton, and the circumferential wall of the pressure-bearing cover has a terminal hole aligned with the coil terminal, and the axial terminal can be inserted into the coil terminal through the terminal hole from outside the pressure-bearing cover.

[0011] Optionally, the outer diameter of the shaft-shaped terminal is smaller than the inner diameter of the terminal hole, thereby forming an annular gap between the shaft-shaped terminal and the hole wall of the terminal hole. This prevents direct contact between the shaft-shaped terminal and the pressure-bearing housing, and achieves preliminary insulation between the shaft-shaped terminal and the pressure-bearing housing.

[0012] Optionally, a crown spring is provided within the coil terminal, and the shaft-shaped terminal has a first contact portion and a second contact portion at each end, wherein the first contact portion is inserted into and contacts the crown spring, and the second contact portion extends outward from the pressure-bearing housing. The use of a crown spring within the coil terminal can compensate for positional errors between the coil terminal and the terminal hole, while allowing the shaft-shaped terminal a certain degree of axial freedom, but limiting its radial freedom.

[0013] Optionally, the axial terminal has an insulating coating or insulating overmolding in the region between the first and second contact portions. For example, micron-level insulating coating or wire-level overmolding can be used for insulation protection. This further improves the insulation reliability between the axial terminal and the pressure-bearing housing, ensuring reliable insulation between the axial terminal and the pressure-bearing housing even if the axial terminal bends and contacts the pressure-bearing housing.

[0014] Optionally, the first contact portions of the coil terminal and the shaft-shaped terminal are encapsulated with glue, thereby preventing explosion caused by contact between the current and the gas in the area where the shaft-shaped terminal contacts the coil terminal.

[0015] Optionally, the outer wall of the pressure-bearing housing is provided with a protruding threaded joint coaxial with the terminal hole, the threaded joint having external threads, and an end cap having internal threads is tightened onto the threaded joint and interacts with the shoulder of the axial terminal to prevent the axial terminal from being forced out of the pressure-bearing housing by the gas pressure in the inner cavity. As mentioned above, the pressure regulating valve is typically used for high-pressure gas, and therefore, very high pressure exists within the pressure-bearing housing. This very high pressure acts on the axial terminal, forcing it out of the pressure-bearing housing. By using a threaded joint with external threads and an end cap with internal threads, it is possible to withstand very high pressures, thereby ensuring that the axial terminal is securely retained in the terminal hole.

[0016] Optionally, the terminal hole has a boss, and when the pressure regulating valve is assembled, a sealing device mounted on the axial terminal is clamped between the boss and the axial shoulder. Optionally, the sealing device includes at least one sealing ring and retaining rings located on both sides of the sealing ring. The sealing device composed of the sealing ring and the retaining ring can achieve a high-pressure sealing solution of up to 600 bar. In addition, the retaining ring can provide radial support for the axial terminal, thereby preventing the axial terminal from deflecting under pressure, thereby preventing the axial terminal from contacting the pressure-bearing housing due to deflection.

[0017] Optionally, an insulator is provided between the end cover and the axial terminal.

[0018] Optionally, the pressure regulating valve has an inlet pressure exceeding 200 bar.

[0019] However, it should be noted that although the pressure regulating valve is designed for high-pressure natural gas, it can of course also be used without problems for natural gas with a lower pressure and also for gases other than natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following will further describe the embodiments of the present application in conjunction with the accompanying drawings, but those skilled in the art will appreciate that these drawings are only for the purpose of explaining the embodiments and should not be used to limit the scope of the present application.

[0021] Figure 1 is a cross-sectional view of a pressure regulating valve according to an embodiment of the present application;

[0022] Figure 2 is a cross-sectional view of a pressure regulating valve according to an embodiment of the present application;

[0023] Figure 3 yes Figure 2 An enlarged view of a portion of the pressure regulating valve in the area of ​​the coil terminal and the shaft terminal is shown. DETAILED DESCRIPTION

[0024] Figure 1 and Figure 2 Schematically shows a cross-sectional view of a pressure regulating valve according to an embodiment of the present application, wherein: Figure 1 It is along Figure 2 The sectional view of the FF cutting line in Figure 2 It is along Figure 1 sectional view along the EE line in FIG. The pressure regulating valve can be used for gas, in particular high-pressure gas, which therefore has, for example, an inlet pressure of more than 200 bar. However, it should be noted that although the pressure regulating valve is designed for high-pressure gas, it can of course also be used without problems for gas with lower pressure and for gases other than gas.

[0025] from Figure 1 As can be seen in FIG, the pressure regulating valve includes a hollow cylindrical pressure-bearing housing 3 made of soft magnetic material, the pressure-bearing housing 3 defines an inner cavity and has a closed end. Figure 1 The upper end of the pressure-bearing housing 3 is a closed end. In addition, the pressure regulating valve includes a coil device, which has a coil skeleton 4 and an electromagnetic coil 5 supported by the coil skeleton 4. Figure 1 It can be clearly seen in FIG that the coil device is fixedly mounted in the inner cavity, so when the pressure regulating valve is in operation, the coil device is immersed in the gas.

[0026] That is, in the pressure regulating valve, the coil assembly is no longer mounted outside the pressure-bearing housing 3, but rather inside it. During operation, the coil assembly is immersed in the high-pressure gas within the interior of the pressure-bearing housing 3. This immersion of the coil assembly in the high-pressure gas means that not only the coil bobbin 4 of the coil assembly but also the electromagnetic coil 5 of the coil assembly are in direct contact with the high-pressure gas. By securely mounting the coil assembly inside the pressure-bearing housing 3 and constructing the pressure-bearing housing 3 from a soft magnetic material, a high degree of coupling between the electromagnetic coil 5 and the needle valve of the pressure regulating valve can be achieved, thereby improving the valve's actuation capability and responsiveness.

[0027] Back again Figure 1 The coil frame 4 has a first axial end and a second axial end opposite to each other. In order to fix the coil device inside the pressure-bearing housing 3, the coil device is fixed with the first axial end, that is, Figure 1 The upper axial end of the pressure shell 3 abuts against the closed end of the pressure shell 3 in the axial direction of the pressure shell 3 and at the second axial end, that is, Figure 1 The lower axial end of the coil assembly is fixed in the pressure housing 3 along the axial direction by a first fixing member 2 fixed to the inner circumferential wall of the pressure housing 3. In this way, the coil assembly can be fixedly installed in the pressure housing 3 in a simple and reliable manner, and the coil assembly can also be easily removed from the pressure housing 3 during maintenance. Figure 1 In the embodiment shown, the first fixing member 2 is a clamp, particularly an annular clamp. However, the first fixing member 2 is not limited to the annular clamp shown in the figure. Of course, other methods can also be used to fix the coil device in the pressure-bearing housing 3.

[0028] from Figure 1 As can be seen in the figure, the pressure regulating valve further includes an armature 8 made of a soft magnetic material, which is coaxially arranged radially inwardly of the coil assembly and fixedly connected to the closed end of the pressure housing 3. Any known method can be used to fixedly connect the armature 8 to the pressure housing 3.

[0029] In addition, the pressure regulating valve further comprises a valve stem 1. Figure 1As can be clearly seen in the figure, the valve stem 1 has a first end section that is axially slidably mounted on the armature 8 and a second end section that is operatively connected to the needle valve (not shown) of the pressure regulating valve. Furthermore, a permanent magnet 7 is radially disposed between the coil assembly and the first end section of the valve stem 1. The permanent magnet 7 is fixed to the first end section of the valve stem 1 so that the permanent magnet 7 and the valve stem 1 can move axially together. When the electromagnetic coil 5 of the solenoid valve is energized, the permanent magnet 7 can reciprocate in the axial direction as the current changes, thereby driving the valve stem 1 to reciprocate in the axial direction. The reciprocating axial movement of the valve stem 1 drives the needle valve of the pressure regulating valve to reciprocate in the axial direction.

[0030] In order to fix the permanent magnet 7 in the axial direction, the first end section of the valve stem 1 has a flange, and the end of the permanent magnet 7 close to the closed end, i.e. Figure 1 The upper end of the permanent magnet 7 abuts against the flange in the axial direction. A second fixing member 6 is fixed to the outer peripheral wall of the first end section of the valve stem 1 on the side of the end of the permanent magnet 7 away from the closed end. The second fixing member 6 fixes the permanent magnet 7 in the axial direction. The flange and the second fixing member 6 thus prevent the permanent magnet 7 from sliding axially along the first end section of the valve stem 1. In the illustrated embodiment, the second fixing member 6 is a clamp, particularly a circular clamp. However, the second fixing member 6 is not limited to the circular clamp illustrated.

[0031] In order to supply power to the electromagnetic coil 5 of the coil device, the coil device has a coil terminal 9 arranged at the first axial end of the coil bobbin 4, and the circumferential wall of the pressure housing 3 has a terminal hole 16 aligned with the coil terminal 9 (at Figure 3 As shown more clearly in FIG, the shaft-shaped terminal 11 can be inserted into the coil terminal 9 from outside the pressure-bearing housing 3 through the terminal hole 16.

[0032] Figure 2 Shown along Figure 1 Sectional view of the cutting line EE in. Figure 2 As can be seen in FIG, the pressure housing 3, the coil frame 4 and the armature 8 are shown concentrically in sequence from the outside to the inside in the radial direction. Figure 2As can be seen from the cross-sectional view shown, the coil device has a total of two coil terminals 9. For this purpose, two terminal holes 16 are correspondingly provided in the circumferential wall of the pressure-bearing housing 3. Thus, the electromagnetic coil 5 can be powered via the coil terminals 9 through the shaft-shaped terminals 11 inserted into the terminal holes 16, thereby driving the valve stem 1 to reciprocate in the axial direction. The contact between the shaft-shaped terminals 11 and the coil terminals 9 and their fixation in the pressure-bearing housing 3 will be described below in conjunction with the attached drawings. Figure 3 Further description is given.

[0033] Figure 3 Shown Figure 2 The pressure regulating valve is shown in a partially enlarged view in the area of ​​the coil terminal 9 and the shaft terminal 11. Figure 3 It can be clearly seen that the outer diameter of the axial terminal 11 is smaller than the inner diameter of the terminal hole 16, thereby forming an annular gap between the axial terminal 11 and the hole wall of the terminal hole 16. The annular gap prevents the axial terminal 11 from directly contacting the pressure-bearing housing 3, thereby achieving preliminary insulation between the axial terminal 11 and the pressure-bearing housing 3. It should be noted that the axial terminal 11 and thus the terminal hole 16 can have a variable diameter. Figure 3 In the illustrated embodiment, the shaft-shaped terminal 11 and the terminal hole 16 have stepped diameters. Specifically, the shaft-shaped terminal 11 and the terminal hole 16 have smaller diameters in sections close to the coil terminal 9 and larger diameters in sections away from the coil terminal 9. However, this is merely exemplary and does not preclude the shaft-shaped terminal 11 and the terminal hole 16 from having uniform diameters or having different diameter distributions, as long as an annular gap is formed between the shaft-shaped terminal 11 and the wall of the terminal hole 16.

[0034] In order to electrically connect the coil terminal 9 to the shaft terminal 11, Figure 3 In the illustrated embodiment, a crown spring 12 is provided within the coil terminal 9. The axial terminal 11 has a first contact portion and a second contact portion at each end. The first contact portion of the axial terminal 11 is inserted into and contacts the crown spring 12, while the second contact portion of the axial terminal 11 extends outward from the pressure-bearing housing 3, enabling an electrically conductive connection to an external power source. The use of the crown spring 12 within the coil terminal 9 is advantageous. This allows for compensating for positional errors between the coil terminal 9 and the terminal hole 16, while allowing the axial terminal 11 a certain degree of axial freedom while limiting its radial freedom.

[0035] In order to further improve the insulation between the axial terminal 11 and the pressure-bearing housing 3, in addition to forming an annular gap between the axial terminal 11 and the wall of the terminal hole 16, the axial terminal 11 may have an insulating coating or insulating overmolding in the area between the first contact portion and the second contact portion. In this case, for example, a micron-level insulating coating or a wire-level overmolding process may be used for insulation protection. By means of the insulating coating or insulating overmolding, even if the axial terminal 11 is bent and contacts the pressure-bearing housing 3, reliable insulation between the axial terminal 11 and the pressure-bearing housing 3 can be achieved. In the area where the coil terminal 9 contacts the axial terminal 11, in order to achieve a conductive connection between the coil terminal 9 and the axial terminal 11, no insulating coating or insulating overmolding is provided. Therefore, in order to avoid gas contact current in this area, the first contact portion of the coil terminal 9 and the axial terminal 11 may be encapsulated with glue after the conductive connection between the coil terminal 9 and the axial terminal 11 is achieved.

[0036] As described above, the pressure regulating valve is used for high-pressure gas and has, for example, an intake pressure exceeding 200 bar, so a very high gas pressure exists within the pressure housing 3. Since the coil assembly is immersed in the gas within the pressure housing 3, the axial terminal 11, which is electrically connected to the coil terminal 9 of the coil assembly, is also exposed to the pressure of the high-pressure gas, thereby forcing the axial terminal 11 out of the pressure housing 3. To prevent the high-pressure gas within the pressure housing 3 from forcing the axial terminal 11 out of the pressure housing 3, the outer wall of the pressure housing 3 is provided with a protruding threaded joint 18 coaxial with the terminal hole 16. The threaded joint 18 has an external thread, and an end cap 10 with an internal thread can be tightened onto the threaded joint 18 and interact with the shoulder 19 of the axial terminal 11, thereby preventing the axial terminal 11 from being forced out of the pressure housing 3 by the gas pressure in the inner cavity. By using the threaded joint 18 with external threads and the end cover 10 with internal threads, very high pressure can be withstood, thereby ensuring that the shaft-shaped terminal 11 is reliably retained in the terminal hole 16 even under very high gas pressure.

[0037] from Figure 3It can also be clearly seen that the terminal hole 16 of the pressure-bearing housing 3 has a shoulder 17 formed by the diameter change of the terminal hole 16. This allows for a sealing device to be installed between the shoulder 17 of the terminal hole 16 and the shoulder 19 of the axial terminal 11. When the pressure regulating valve is assembled, that is, by tightening the end cap 10 onto the threaded joint 18, the sealing device mounted on the axial terminal 11 is clamped between the shoulder 17 and the shoulder 19, thereby achieving a good sealing effect and preventing high-pressure gas from leaking through the terminal hole 16.

[0038] exist Figure 3 In the embodiment shown, the sealing device includes a sealing ring 14 and retaining rings 13 located on both sides of the sealing ring 14. Figure 3 In the illustrated embodiment, only one sealing ring 14 is shown, however, more sealing rings 14 may be provided between the retaining rings 13 as needed to achieve a better sealing effect. This sealing device, when used in combination with the end cover 10, can achieve a high-pressure sealing solution of up to 600 bar. In addition, the retaining ring 13 can provide radial support for the axial terminal 11, thereby preventing the axial terminal 11 from bending under pressure, thereby preventing the axial terminal 11 from contacting the pressure-bearing housing 3 due to bending. In order to prevent the axial terminal 11 from indirectly contacting the pressure-bearing housing 3 via the end cover 10, an insulator 15 is provided between the end cover 10 and the axial terminal 11. As a result, the material selection of the end cover 10 is not restricted.

[0039] The above are merely exemplary embodiments of the present application. The scope of protection of the present application is not limited to the above embodiments. All technical solutions within the scope of protection of the present application are within the scope of protection of the present application. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present application should also be considered within the scope of protection of the present application.

Claims

1. A pressure regulating valve for gas, comprising: A hollow cylindrical pressure-bearing housing (3) made of a soft magnetic material, the pressure-bearing housing (3) defining an inner cavity and having a closed end; as well as A coil device comprising a coil frame (4) and an electromagnetic coil (5) carried by the coil frame (4), It is characterized by: The coil device is fixedly installed in the inner cavity, and when the pressure regulating valve is in operation, the coil device is immersed in the gas.

2. The pressure regulating valve according to claim 1, characterized in that: The coil skeleton (4) has a first axial end and a second axial end opposite to each other, wherein the coil device abuts against the closed end of the pressure shell (3) along the axial direction of the pressure shell (3) with the first axial end and is fixed in the pressure shell (3) at the second axial end along the axial direction by a first fixing member (2) fixed to the inner peripheral wall of the pressure shell (3).

3. The pressure regulating valve according to claim 1, characterized in that: The pressure regulating valve further comprises an armature (8) made of a soft magnetic material, which is coaxially arranged with the coil device and radially inside the coil device and fixedly connected to the closed end of the pressure housing (3).

4. The pressure regulating valve according to claim 3, characterized in that: The pressure regulating valve further comprises a valve stem (1), the valve stem (1) having a first end section which is axially slidably mounted on the armature (8) along the armature (8) and a second end section which is operatively connected to the needle valve of the pressure regulating valve, wherein a permanent magnet (7) is provided in a radial direction between the coil device and the first end section of the valve stem (1) and the permanent magnet (7) is fixed to the first end section of the valve stem (1), so that the permanent magnet (7) and the valve stem (1) can move axially together.

5. The pressure regulating valve according to claim 4, characterized in that: The end of the permanent magnet (7) close to the closed end abuts against the flange of the first end section of the valve stem (1) in the axial direction, and the end of the permanent magnet (7) away from the closed end is fixed to the first end section of the valve stem (1) in the axial direction by a second fixing member (6) fixed on the outer peripheral wall of the first end section of the valve stem (1).

6. The pressure regulating valve according to claim 2, characterized in that: The coil device has a coil terminal (9) arranged at a first axial end of the coil skeleton (4), and the circumferential wall of the pressure-bearing housing (3) has a terminal hole (16) aligned with the coil terminal (9), and an axial terminal (11) can be inserted into the coil terminal (9) from outside the pressure-bearing housing (3) through the terminal hole (16).

7. The pressure regulating valve according to claim 6, characterized in that: The outer diameter of the axial terminal (11) is smaller than the inner diameter of the terminal hole (16), thereby forming an annular gap between the axial terminal (11) and the hole wall of the terminal hole (16).

8. The pressure regulating valve according to claim 6, characterized in that: A crown spring (12) is provided in the coil terminal (9), and the shaft-shaped terminal (11) has a first contact portion and a second contact portion at both ends, wherein the first contact portion is inserted into the crown spring (12) and contacts the crown spring (12), and the second contact portion extends outward from the pressure-bearing housing (3).

9. The pressure regulating valve according to claim 8, characterized in that: The shaft-shaped terminal (11) has an insulating coating or insulating overmolding in a region between the first contact portion and the second contact portion.

10. The pressure regulating valve according to claim 8, characterized in that The first contact portions of the coil terminal (9) and the shaft-shaped terminal (11) are encapsulated with glue.

11. The pressure regulating valve according to claim 6, characterized in that: The outer wall of the pressure-bearing housing (3) is provided with a protruding threaded joint (18) coaxial with the terminal hole (16), and the threaded joint (18) has an external thread. An end cover (10) with an internal thread is screwed onto the threaded joint (18) and interacts with a shoulder (19) of the axial terminal (11), thereby preventing the axial terminal (11) from being pressed out of the pressure-bearing housing (3) by the gas pressure in the inner cavity.

12. The pressure regulating valve according to claim 11, characterized in that: The terminal hole (16) has a convex shoulder (17), and when the pressure regulating valve is assembled, a sealing device sleeved on the shaft-shaped terminal (11) is clamped between the convex shoulder (17) and the shaft shoulder (19).

13. The pressure regulating valve according to claim 12, characterized in that: The sealing device comprises at least one sealing ring (14) and retaining rings (13) located on both sides of the sealing ring (14).

14. The pressure regulating valve according to claim 11, characterized in that An insulator (15) is provided between the end cover (10) and the shaft-shaped terminal (11).

15. The pressure regulating valve according to claim 1, characterized in that The pressure regulating valve has an inlet pressure exceeding 200 bar.

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