Proportional valve

Abstract

Disclosed in the present invention is a proportional valve. The proportional valve comprises: a welding body part, comprising a welding part and a tightening cap connected to the welding part, wherein the welding part comprises a magnetic shield and a base connected to the magnetic shield, and a valve body is mounted in the base; an adjustment screw plug assembly, comprising an adjustment screw plug threadedly connected to the inner wall of the tightening cap; an armature assembly, comprising a shaft, an elastic piece, an armature base, and an armature, wherein the upper end of the armature base is pressed into an accommodation hole formed in the bottom of the armature and tightly presses the elastic piece between the armature base and the armature, a valve body gasket is mounted between the elastic piece and the valve body, a lift adjustment gasket is mounted between the elastic piece and the inner top wall of the base, an armature spring is sleeved on the outer side of the shaft, a guide mechanism is mounted in the tightening cap, the bottom of the guide mechanism is provided with a hollow structure, and the upper end of the shaft is located in the hollow structure provided at the bottom of the guide mechanism; and a coil assembly, sleeved on the outer side of the magnetic shield. The proportional valve of the present invention has a modular design, is convenient to disassemble and assemble, and has good hysteresis performance and repeatability performance.

Description

A proportional valve Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and more particularly to a proportional valve. Background Art

[0002] A proportional valve is a valve element in which an internal electromagnet module responds to an input current signal, causing the valve core to displace and the valve opening size to change, thereby achieving a pressure and flow output proportional to the input current. For example, Chinese invention patent application number 201880054472.1 discloses a proportional valve for controlling gaseous media. A closing element disposed within the valve housing interacts with the valve seat to open and close at least one through-opening. Furthermore, a magnetic armature assembly and an electromagnet operatively connected to the closing element are provided. The electromagnet generates a magnetic force acting on the magnetic armature assembly, enabling the magnetic armature assembly to be raised and lowered along the longitudinal axis of the proportional valve. The electromagnet comprises an inner pole, an outer pole, and an electromagnetic coil, and the magnetic armature assembly comprises a magnetic armature. The valve housing and the inner pole are magnetically connected to each other via a magnetic throttling portion, which is located within the axial extension of the magnetic armature. Furthermore, the inner pole has a groove with an edge into which the magnetic armature sinks during its raising and lowering motion. In the closed position of the proportional valve, the end face of the magnetic armature is at the same height as the groove edge of the groove relative to the longitudinal axis. The groove edge forms the end of the magnetic throttling portion. This invention, by means of electronically controlling the flow cross section of the through-opening, can significantly more accurately supply the first gaseous medium and meter hydrogen into the anode area of ​​the fuel cell while regulating the anode pressure, thereby improving the operational safety and durability of the connected fuel cell; however, this invention does not adopt a modular design, making it inconvenient to disassemble and assemble the proportional valve, and it is also inconvenient to adjust the lift size according to actual needs. The magnetic armature device in this invention is guided by the first guide section and the second guide section during the lifting movement. The magnetic armature device and the first guide section and the second guide section both generate friction, resulting in a large friction resistance, and the hysteresis performance and repeatability of the proportional valve are poor.

[0003] Summary of the Invention

[0004] The present invention provides a proportional valve for realizing convenient disassembly and assembly of the proportional valve and improving the hysteresis performance and repeatability of the proportional valve.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0006] A proportional valve, comprising:

[0007] The welding body component includes a welding component and a tightening cap connected to the welding component; specifically, the welding component and the tightening cap are connected by welding;

[0008] The welding component includes a magnetic isolation sleeve and a base connected to the magnetic isolation sleeve, and a valve body is provided at the lower part of the base. Specifically, a first step hole is provided inside the base, and the valve body is installed inside the first step hole, and the base and the magnetic isolation sleeve are connected by welding; the material of the base is magnetic conductive stainless steel, and the lower side of the base is provided with an external thread for connecting to the mounting hole; the lower part of the first step hole is provided with an internal thread, and the bottom of the step is flat; the outer diameter of the lower part of the tight cap is the same as that of the magnetic isolation sleeve; the upper part of the tight cap is provided with an external thread, and the side wall of the tight cap below the external thread is provided with a knife retreat groove; a through hole is provided inside the tight cap, and the upper part of the through hole is provided with an internal thread, and a sealing ring lead-in angle is provided between the middle part of the through hole and the knife retreat groove, and the diameter of the bottom of the through hole is larger than the middle part;

[0009] The armature assembly includes a spring, an armature seat, and an armature mechanism. The armature seat is mounted on the bottom of the armature mechanism and compresses the spring between the armature mechanism and the armature seat. An armature spring is sleeved on the outer side of the upper portion of the armature mechanism. A guide mechanism for guiding the movement direction of the armature mechanism is mounted inside the tightening cap. The bottom of the guide mechanism is configured as a hollow structure, and the upper portion of the armature mechanism is located within the hollow structure at the bottom of the guide mechanism.

[0010] Specifically, the armature mechanism includes a shaft and an armature, that is, the armature assembly includes a shaft, a spring piece, an armature seat and an armature, and a accommodating hole is provided at the bottom of the armature, and the upper end of the armature seat is installed in the accommodating hole and presses the spring piece between the armature seat and the armature; a valve body gasket is installed between the spring piece and the valve body, thereby pressing the spring piece, and the shape of the spring piece after being compressed is a bowl shape with the four sides on top and the middle at the bottom; a lift adjustment gasket is installed between the spring piece and the inner top wall of the base; specifically, the lift adjustment gasket and the valve body gasket are both circular ring structures, and the outer diameters of the lift adjustment gasket and the valve body gasket match the diameter of the threaded bottom hole at the lower part of the base, and the inner diameters of the lift adjustment gasket and the valve body gasket are larger than the inner diameter of the outer ring of the spring piece, and the thickness of the lift adjustment gasket can be selected from a variety of specifications. By using lift adjustment gaskets of different thicknesses, the distance between the armature boss and the magnetic isolation gasket installed on the inner side of the bottom of the tight cap can be adjusted;

[0011] A second stepped hole is formed at the top of the armature, and the lower end of the shaft is located in the second stepped hole. An armature spring is sleeved on the outside of the shaft, and a guide mechanism for guiding the movement direction of the shaft is installed inside the tightening cap. The bottom of the guide mechanism is configured as a hollow structure, and the upper end of the shaft is located within the hollow structure at the bottom of the guide mechanism. The armature spring is a cylindrical helical spring made of non-magnetic stainless steel, and its inner diameter is larger than the outer diameter of the shaft. The guide mechanism presses the armature spring from above, and the spring force of the armature spring can be adjusted by screwing the guide mechanism in or out.

[0012] The coil assembly is sleeved on the outside of the magnetic isolation sleeve. The material of the magnetic isolation sleeve is non-magnetic stainless steel and the shape is a sleeve with uniform wall thickness. The inner hole of the magnetic isolation sleeve has the same diameter as the through hole of the base.

[0013] Furthermore, the guide mechanism is an adjusting screw plug assembly, which includes an adjusting screw plug, a through hole is provided inside the tight cap, the adjusting screw plug is threadedly connected to the inner wall of the tight cap, and the bottom of the adjusting screw plug is a hollow structure.

[0014] Furthermore, a boss is provided on the top of the base, and the bottom of the coil assembly is in contact with the boss, and the boss is used for the installation and positioning of the coil assembly; the outer wall of the tightening cap located above the coil assembly is threadedly connected with a hexagonal thin nut; that is, the coil assembly is installed on the boss of the base, and the upper top is tightened by the hexagonal thin nut and the outer thread of the tightening cap.

[0015] Furthermore, a vent hole communicating with the hollow structure at the bottom of the adjusting screw plug is formed on the side wall of the adjusting screw plug.

[0016] Furthermore, the upper end of the armature spring abuts against the lower end of the adjusting screw plug; a spring guide hole is formed between the inner wall of the upper end of the second step hole and the outer wall of the shaft, and the lower end of the armature spring is arranged in the spring guide hole.

[0017] Furthermore, a straight groove or other mechanism for driving rotation is provided on the top of the adjusting screw plug, and a first sealing ring groove is provided on the middle outer wall of the adjusting screw plug, in which a first sealing ring is installed; the first sealing ring is an O-shaped rubber sealing ring, which is used to separate the inside and outside of the proportional valve.

[0018] Furthermore, a second sealing ring groove is formed on the side wall of the valve body, and a second sealing ring and a retaining ring are installed in the second sealing ring groove.

[0019] Furthermore, the lower end side wall of the base is provided with an external thread, the upper end of the base is a hexagonal mounting flange, and the side wall of the base above the external thread is provided with a third sealing ring groove. To be precise, the third sealing ring groove is located between the external thread and the mounting flange; the aperture of the top of the base is the same as the aperture of the magnetic isolation sleeve; and a third sealing ring is installed in the third sealing ring groove.

[0020] Furthermore, a flange is provided on the outer side of the upper part of the valve body, and the flange is provided with an external thread. The external thread of the flange matches the internal thread at the lower end of the first step hole inside the base. At least one air outlet is opened axially through the flange, and an air inlet is opened axially through the middle part of the valve body.

[0021] Furthermore, the first step hole includes a first through hole close to the outside and a second through hole close to the inner cavity, and the diameter of the second through hole is smaller than that of the first through hole; the side wall of the armature is provided with a magnetic isolation groove at a position close to the lower part of the second through hole, that is, the armature is provided with a magnetic isolation groove at a position corresponding to the bottom of the step hole of the base, and the magnetic isolation groove is used to reduce the magnetic flux flow area during the rising process of the armature, thereby reducing the rising speed of the electromagnetic force on the armature when it moves upward.

[0022] Preferably, the first step hole includes a first through hole close to the outside and a second through hole close to the inner cavity, and the diameter of the second through hole is smaller than the first through hole; the outer diameter of the armature is smaller than the inner diameter of the magnetic isolation sleeve, and the outer diameter of the armature is smaller than the diameter of the second through hole; that is, the outer diameter of the armature is smaller than the inner diameter of the magnetic isolation sleeve and the corresponding position of the base, and a certain gap is left.

[0023] Preferably, a bearing mounting groove is formed on the inner wall of the bottom of the adjusting screw plug, a bearing is mounted in the bearing mounting groove, the upper end of the shaft is mounted inside the bearing, and the lower end of the shaft is press-fitted into the second step hole on the top of the armature; the shaft is inserted into the bearing, and after the adjusting screw plug assembly is assembled, the distance from the shaft to the bottom of the adjusting screw plug hole should be greater than the distance between the armature boss and the magnetic isolation gasket mounted on the bottom of the tight cap;

[0024] The upper part of the armature assembly is guided by the bearing, and the lower part is guided by the spring, which avoids contact between it and the magnetic isolation sleeve and the base, reduces friction, and improves the hysteresis performance and repeatability of the proportional valve.

[0025] Preferably, a bearing is installed in the second step hole at the top of the armature, the lower end of the shaft is installed inside the bearing, and the upper end of the shaft is press-fitted into the hollow structure at the bottom of the adjusting screw plug.

[0026] Preferably, the side wall of the bottom of the tight cap is a boss structure, and a groove is provided on the outer side of the top of the armature for the side wall of the bottom of the tight cap to enter and exit; the boss structure is used to increase the initial electromagnetic force.

[0027] Preferably, the side wall of the top of the armature is a boss structure, and a groove for the side wall of the top of the armature to enter and exit is formed on the outer side of the bottom of the tight cap.

[0028] Preferably, a groove body is provided on the inner side of the bottom of the tightening cap, and a magnetic isolation gasket is installed in the groove body. The magnetic isolation gasket is an annular structure and is made of a non-magnetic material. Its outer diameter matches the mounting groove of the tightening cap, and its inner hole diameter is larger than the outer diameter of the armature spring; the top of the armature is a boss structure adapted to the groove body at the bottom of the tightening cap, and is used to enable the boss structure at the top of the armature to move in and out of the groove body at the bottom of the tightening cap; the diameter of the boss structure at the top of the armature is smaller than the outer diameter of the armature, and smaller than the inner diameter of the bottom of the through hole of the tightening cap;

[0029] As the armature and the locking cap approach each other, the electromagnetic force on the armature increases faster and faster. The magnetic isolation gasket can avoid the mismatch between the electromagnetic force and the spring force caused by the armature and the locking cap being too close.

[0030] Preferably, a groove body is provided on the inner side of the bottom of the tight cap, and the top of the armature is a boss structure adapted to the groove body of the bottom of the tight cap, and a magnetic isolation buffer gasket is installed on the boss structure of the armature top.

[0031] Preferably, a sealing gasket mounting groove is provided at the bottom of the armature seat, and a sealing gasket is installed in the sealing gasket mounting groove; a stepped hole is axially penetrated through the middle of the valve body as an air inlet hole, and a hollow conical boss is provided on the top of the valve body, and the diameter of the stepped hole close to the conical boss is smaller than the diameter of the top of the conical boss; the cone angle of the conical boss is 90°-120°, the hollow part of the conical boss is connected to the air inlet hole, and the sealing gasket is located above the hollow part of the conical boss; the width of the annular band formed by the top of the conical boss and the hole in the conical boss is 0.2-0.5mm; during use, the sealing gasket contacts the conical boss on the top of the valve body to form a sealing surface;

[0032] Furthermore, the top of the armature seat is provided with an exhaust hole connecting the accommodating hole at the bottom of the armature and the sealing gasket mounting groove, and the armature seat is provided with an air vent connecting the first step hole inside the base and the sealing gasket mounting groove; the exhaust hole is used to allow the internal gas to be discharged when the armature seat is pressed into the armature, and the air vent is used to allow the internal gas to be discharged when the sealing gasket is pressed into the armature seat.

[0033] Preferably, a mounting groove is provided on the top of the valve body, a hollow gasket is installed in the mounting groove, and a protruding structure adapted to the hollow portion of the gasket is provided on the bottom of the armature seat.

[0034] Furthermore, the spring piece includes a first circular ring and a second circular ring, the diameter of the first circular ring is smaller than that of the second circular ring, the first circular ring and the second circular ring are connected together by at least three reciprocating bending structures, the reciprocating bending structure includes a bending section, and the width of the bending section is greater than other parts of the reciprocating bending structure.

[0035] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0036] First, the proportional valve provided by the present invention has a modular design. The user sets a mounting hole on the mounting body, and then the proportional valve can be installed through the external thread of the base, which facilitates the design of the customer's mounting body and the subsequent disassembly and replacement of the proportional valve as a whole. In addition, the valve body of the proportional valve of the present invention is screwed in and out through the internal thread at the lower part of the stepped hole of the base, and the coil assembly is also installed in a detachable manner. The adjusting screw plug assembly is screwed into the hole on the upper part of the tight cap from the top. The modular design makes the disassembly and assembly of the proportional valve relatively convenient.

[0037] Second, the proportional valve provided by the present invention is provided with a lift adjustment gasket. The thickness of the lift adjustment gasket can be selected from a variety of specifications. By using lift adjustment gaskets of different thicknesses, the distance between the armature boss and the magnetic isolation gasket installed on the inner side of the bottom of the tight cap can be adjusted;

[0038] 3. The proportional valve provided by the present invention is provided with a magnetic isolation groove. The design of the magnetic isolation groove can reduce the magnetic flux flow area during the armature rising process, thereby reducing the rising speed of the electromagnetic force exerted on the armature when it moves upward;

[0039] Fourth, the upper portion of the armature assembly in the proportional valve provided by the present invention is guided by a bearing, and the lower portion is guided by a spring, thereby avoiding contact between the armature assembly and the magnetic isolation sleeve and the base. Only a small friction with the bearing occurs, which reduces friction and improves the hysteresis performance and repeatability of the proportional valve.

[0040] 5. The boss structure designed in the proportional valve provided by the present invention can increase the initial electromagnetic force, making the proportional valve more sensitive;

[0041] 6. The magnetic isolation gasket provided in the proportional valve provided by the present invention can avoid the mismatch between the electromagnetic force and the spring force caused by the armature and the tightening cap being too close. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] FIG1 is a schematic structural diagram of a proportional valve provided in an embodiment of the present invention;

[0044] FIG2 is a schematic structural diagram of FIG1 of the present invention after removing the valve body gasket;

[0045] FIG3 is a schematic structural diagram of FIG1 of the present invention after the position of the boss structure is changed;

[0046] FIG4 is a schematic structural diagram of the present invention after the installation position of the magnetic isolation gasket is changed based on FIG1 ;

[0047] FIG5 is a schematic structural diagram of the present invention after the installation position of the sealing gasket is changed based on FIG1;

[0048] FIG6 is a schematic structural diagram of the present invention after the installation position of the bearing is changed based on FIG1;

[0049] FIG7 is a schematic structural diagram of a spring provided in an embodiment of the present invention;

[0050] FIG8 is a schematic structural diagram of FIG1 of the present invention after removing the lift adjustment gasket;

[0051] Description of the marks in the figure:

[0052] 1. Welding body parts; 101. Welding parts; 1011. Magnetic isolation sleeve; 1012. Base; 10121. Boss; 102. Tightening cap;

[0053] 2. Adjusting screw plug assembly; 201. First sealing ring; 202. Bearing; 203. Adjusting screw plug; 204. Vent hole;

[0054] 3. Armature assembly; 301. Shaft; 302. Spring; 3021. First ring; 3022. Second ring; 3023. Reciprocating bending structure; 30231. Bend section; 303. Armature seat; 304. Sealing gasket; 305. Armature; 3051. Magnetic isolation groove; 306. Gasket;

[0055] 4. Coil assembly; 5. Hexagonal thin nut; 6. Second sealing ring; 7. Third sealing ring; 8. Retaining ring; 9. Lift adjustment gasket; 10. Valve body gasket; 11. Valve body; 12. Armature spring; 13. Magnetic isolation gasket; 14. Air inlet; 15. Air outlet. DETAILED DESCRIPTION

[0056] In order to better understand the purpose, structure and function of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0057] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not indicate the importance of the components and therefore cannot be understood as limiting the present invention. The specific dimensions used in the embodiments are only for illustrating the technical solutions and do not limit the scope of protection of the present invention. It is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0058] Unless otherwise expressly specified or limited, terms such as "installed," "disposed," "connected," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0059] Example 1:

[0060] As shown in Figure 1-2, the present invention provides a technical solution: a proportional valve, comprising:

[0061] The welding body component 1 includes a welding component 101 and a tight cap 102 connected to the welding component 101; specifically, the welding component 101 and the tight cap 102 are connected by argon arc welding;

[0062] The welding component 101 includes a magnetic isolation sleeve 1011 and a base 1012 connected to the magnetic isolation sleeve 1011, and a valve body 11 is provided at the lower part of the base 1012. Specifically, a first step hole is provided inside the base 1012, and the valve body 11 is installed inside the first step hole; the connection method between the base 1012 and the magnetic isolation sleeve 1011 is friction welding; the material of the base 1012 is magnetic conductive stainless steel, and the lower side of the base 1012 is provided with an external thread for connecting to the mounting hole; the lower part of the first step hole is provided with an internal thread, and the bottom of the step is flat; the outer diameter of the lower part of the tightening cap 102 is the same as that of the magnetic isolation sleeve 1011; the upper part of the tightening cap 102 is provided with an external thread, and the side wall of the tightening cap 102 below the external thread is provided with a tool retreat groove; the interior of the tightening cap 102 is provided with a through hole, the upper part of the through hole is provided with an internal thread, and a sealing ring lead-in angle is provided between the middle part of the through hole and the tool retreat groove, and the diameter of the bottom of the through hole is larger than the middle;

[0063] The armature assembly 3 includes a spring piece 302, an armature seat 303, and an armature mechanism. The armature seat 303 is mounted on the bottom of the armature mechanism and compresses the spring piece 302 between the armature mechanism and the armature seat 303. The armature mechanism is sheathed with an armature spring 12 on the outer side of the upper portion. The locking cap 102 is internally mounted with a guide mechanism for guiding the movement direction of the armature mechanism. The bottom of the guide mechanism is configured as a hollow structure, and the upper portion of the armature mechanism is located within the hollow structure at the bottom of the guide mechanism.

[0064] The armature mechanism includes a shaft 301 and an armature 305.

[0065] The armature mechanism can be a native armature mechanism or a regenerated armature mechanism. The native armature mechanism refers to the shaft 301 and the armature 305 in the armature mechanism being integrally formed. The regenerated armature mechanism refers to the shaft 301 and the armature 305 being manufactured separately and then assembled.

[0066] That is, the armature assembly 3 includes a shaft 301, a spring 302, an armature seat 303 and an armature 305.

[0067] The armature seat 303 and the armature 305 can be connected in a variety of ways. For example, a receiving hole is opened at the bottom of the armature 305, and the upper end of the armature seat 303 is installed in the receiving hole to press the spring piece 302 between the armature seat 303 and the armature 305; the upper end of the armature seat 303 is pressed into the receiving hole at the bottom of the armature 305. Of course, the armature seat 303 and the armature 305 can also be connected by other means such as threads, glue, etc., or by opening a hole in the armature seat 303.

[0068] When the armature mechanism adopts a regenerative armature mechanism, a second stepped hole is formed at the top of the armature 305, and the lower end of the shaft 301 is located in the second stepped hole; an armature spring 12 is sleeved on the outer side of the shaft 301, and a guide mechanism for guiding the movement direction of the shaft 301 is installed inside the tightening cap 102. The bottom of the guide mechanism is configured as a hollow structure, and the upper end of the shaft 301 is located in the hollow structure at the bottom of the guide mechanism;

[0069] When the armature mechanism adopts the original armature mechanism, the shaft 301 and the armature 305 are made into one part, and the top of the armature 305 is flat, so the second step hole is not required.

[0070] The armature spring 12 is a cylindrical helical spring made of non-magnetic stainless steel, and its inner diameter is larger than the outer diameter of the shaft 301. The guide mechanism compresses the armature spring 12 from above. The spring force of the armature spring 12 can be adjusted by screwing the guide mechanism in or out.

[0071] The coil assembly 4 is sleeved on the outside of the magnetic isolation sleeve 1011. The magnetic isolation sleeve 1011 is made of non-magnetic stainless steel and is shaped like a sleeve with uniform wall thickness. The inner hole of the magnetic isolation sleeve 1011 has the same diameter as the through hole of the base 1012.

[0072] The proportional valve provided by the present invention is a modular design, which facilitates the disassembly and assembly of the proportional valve:

[0073] From the perspective of disassembly and assembly of the proportional valve on the mounting body, the user sets a mounting hole on the mounting body, and then the proportional valve can be installed through the external thread of the base 1012, which is convenient for the customer to design the mounting body and subsequently disassemble and replace the proportional valve as a whole;

[0074] From the perspective of disassembly and assembly of the internal parts of the proportional valve, the valve body 11 is screwed in and out from the internal thread at the lower part of the stepped hole of the base 1012, and the coil assembly 4 is also installed in a detachable manner.

[0075] Example 2:

[0076] On the basis of Example 1, referring to Figure 1, the guide mechanism is an adjusting screw plug assembly 2, which includes an adjusting screw plug 203. A through hole is provided inside the tight cap 102. The adjusting screw plug 203 is threadedly connected to the inner wall of the tight cap 102, and the bottom of the adjusting screw plug 203 is a hollow structure; specifically, the upper part of the adjusting screw plug 203 is an external thread, which cooperates with the internal thread of the tight cap 102, and the outer diameter of the adjusting screw plug 203 is smaller than the diameter of the middle part of the through hole of the tight cap 102; the adjusting screw plug assembly 2 is screwed into the hole on the upper part of the tight cap 102 from the top.

[0077] Furthermore, a vent hole 204 is formed on the side wall of the adjusting screw plug 203 and is connected to the hollow structure at the bottom of the adjusting screw plug 203 .

[0078] Furthermore, the upper end of the armature spring 12 abuts against the lower end of the adjusting screw plug 203 ; a spring guide hole is formed between the inner wall of the upper end of the second step hole and the outer wall of the shaft 301 , and the lower end of the armature spring 12 is arranged in the spring guide hole.

[0079] Furthermore, a straight groove or other mechanism for driving rotation is provided on the top of the adjusting screw plug 203, and a first sealing ring groove is provided on the middle outer wall of the adjusting screw plug 203, in which a first sealing ring 201 is installed; the first sealing ring 201 is an O-type rubber sealing ring, which is used to separate the inside and outside of the proportional valve.

[0080] Example 3:

[0081] On the basis of Example 2, referring to Figure 1, the first step hole includes a first through hole close to the outside and a second through hole close to the inner cavity, and the diameter of the second through hole is smaller than that of the first through hole; the outer diameter of the armature 305 is smaller than the inner diameter of the magnetic isolation sleeve 1011, and the outer diameter of the armature 305 is smaller than the diameter of the second through hole; that is, the outer diameter of the armature 305 is smaller than the inner diameter of the corresponding positions of the magnetic isolation sleeve 1011 and the base 1012, and a certain gap is left.

[0082] Example 4:

[0083] Based on Example 2, with reference to Figures 1-2, a bearing mounting groove is defined on the inner wall of the bottom of the adjusting screw plug 203. A bearing 202 is mounted in the bearing mounting groove. The upper end of the shaft 301 is mounted inside the bearing 202, and the lower end of the shaft 301 is press-fitted into the second stepped hole at the top of the armature 305. The shaft 301 penetrates the bearing 202. After the adjusting screw plug assembly 2 is assembled, the distance from the shaft 301 to the bottom of the adjusting screw plug 203 hole should be greater than the distance between the boss of the armature 305 and the magnetic isolation gasket mounted on the bottom of the tightening cap 102.

[0084] The upper part of the armature assembly 3 is guided by the bearing 202, and the lower part is guided by the spring 302, which avoids contact between it and the magnetic isolation sleeve 1011 and the base 1012, reduces friction, and improves the hysteresis performance and repeatability of the proportional valve.

[0085] Example 5: (This example is a modified structure of Example 4, except that the installation position of the bearing is different)

[0086] Based on Example 2, referring to Figure 6, a bearing is installed in the second step hole at the top of the armature 305, the lower end of the shaft 301 is installed inside the bearing, and the upper end of the shaft 301 is press-fitted into the hollow structure at the bottom of the adjusting screw plug 203.

[0087] Example 6:

[0088] On the basis of Example 1, referring to Figure 1, a boss 10121 is provided on the top of the base 1012, and the bottom of the coil assembly 4 is in conflict with the boss 10121. The boss 10121 is used for the installation and positioning of the coil assembly 4; the outer wall of the tightening cap 102 located above the coil assembly 4 is threadedly connected with a hexagonal thin nut 5; that is, the coil assembly 4 is installed on the boss 10121 of the base 1012, and the upper top is tightened by the hexagonal thin nut 5 and the external thread of the tightening cap 102.

[0089] Furthermore, a second sealing ring groove is formed on the side wall of the valve body 11 , in which a second sealing ring 6 and a retaining ring 8 are installed; the second sealing ring 6 and the retaining ring 8 serve to separate the air inlet 14 and the air outlet 15 .

[0090] Furthermore, the lower end side wall of the base 1012 is provided with an external thread, the upper end of the base 1012 is a hexagonal mounting flange, and the side wall of the base 1012 above the external thread is provided with a third sealing ring groove. To be precise, the third sealing ring groove is located between the external thread and the mounting flange; the aperture of the top of the base 1012 is the same as the aperture of the magnetic isolation sleeve 1011; and a third sealing ring 7 is installed in the third sealing ring groove.

[0091] Furthermore, a flange is provided on the outer side of the upper part of the valve body 11, and the flange is provided with an external thread. The external thread of the flange matches the internal thread at the lower end of the first step hole inside the base 1012. At least one air outlet 15 is axially penetrated through the flange, and an air inlet 14 is axially penetrated through the middle part of the valve body 11.

[0092] Furthermore, the first step hole includes a first through hole close to the outside and a second through hole close to the inner cavity, and the diameter of the second through hole is smaller than that of the first through hole; the side wall of the armature 305 is provided with a magnetic isolation groove 3051 at a position close to the lower part of the second through hole, that is, the armature 305 is provided with a magnetic isolation groove 3051 at a position corresponding to the bottom of the step hole of the base 1012, and the magnetic isolation groove 3051 is used to reduce the magnetic flux flow area during the rising process of the armature 305, thereby reducing the rising speed of the electromagnetic force on the armature 305 when it moves upward.

[0093] Example 7:

[0094] On the basis of Example 1, referring to Figures 1-2, the side wall of the bottom of the tight cap 102 is a boss structure. Furthermore, the boss structure is a tapered boss structure, and a groove is provided on the outer side of the top of the armature 305 for the side wall of the bottom of the tight cap 102 to enter and exit; the boss structure is used to increase the initial electromagnetic force and make the proportional valve more sensitive.

[0095] Example 8: (This example is a modified structure of Example 7, except that the position of the boss structure is different)

[0096] On the basis of Example 1, referring to FIG3 , the side wall of the top of the armature 305 is a boss structure. Furthermore, the boss structure is a tapered boss structure, and a groove is provided on the outer side of the bottom of the tightening cap 102 for the side wall of the top of the armature 305 to enter and exit.

[0097] Example 9:

[0098] On the basis of Example 1, referring to FIG. 1-2 and FIG. 4 , a magnetic isolation gasket 13 is installed on the bottom of the tightening cap 102 or the top of the armature 305 .

[0099] Example 10:

[0100] Based on Example 9, with reference to Figures 1-2, a groove is provided on the inner side of the bottom of the locking cap 102, and a magnetic isolation gasket 13 is installed in the groove. The magnetic isolation gasket 13 is an annular structure made of a non-magnetic material, with an outer diameter that matches the mounting groove of the locking cap 102 and an inner hole diameter that is larger than the outer diameter of the armature spring 12. The top of the armature 305 is a boss structure that adapts to the groove at the bottom of the locking cap 102, which is used to enable the boss structure on the top of the armature 305 to move in and out of the groove at the bottom of the locking cap 102. The diameter of the boss structure on the top of the armature 305 is smaller than the outer diameter of the armature and smaller than the inner diameter of the bottom of the through hole of the locking cap 102.

[0101] As the armature 305 and the locking cap 102 approach each other, the electromagnetic force on the armature 305 increases faster and faster. The magnetic isolation gasket 13 can prevent the electromagnetic force and the spring force from not matching each other due to the armature 305 and the locking cap 102 being too close.

[0102] Example 11: (This example is a modified structure of Example 10, except that the magnetic isolation gasket is installed in a different position)

[0103] Based on Example 9, referring to Figure 4, a groove is provided on the inner side of the bottom of the tight cap 102, and the top of the armature 305 is a boss structure adapted to the groove at the bottom of the tight cap 102. The boss structure on the top of the armature 305 is installed with a magnetic isolation gasket 13.

[0104] Example 12:

[0105] Based on Example 1, with reference to Figures 1-2, a sealing gasket mounting groove is defined at the bottom of the armature seat 303, in which a sealing gasket 304 is mounted. A stepped hole is axially penetrated through the middle portion of the valve body 11, serving as the air inlet 14. A hollow conical boss is defined at the top of the valve body 11, with the diameter of the stepped hole on the side closest to the conical boss being smaller than the diameter of the top of the conical boss. The conical boss has a taper angle of 90°-120°, the hollow portion of the conical boss communicates with the air inlet 14, and the sealing gasket 304 is located above the hollow portion of the conical boss. The width of the annular band formed by the top of the conical boss and the hole within the conical boss is 0.2-0.5 mm.

[0106] During use, the sealing gasket 304 contacts the conical boss on the top of the valve body 11 to form a sealing surface.

[0107] Furthermore, the top of the armature seat 303 is provided with an exhaust hole connecting the accommodating hole at the bottom of the armature 305 and the sealing gasket installation groove, and the armature seat 303 is provided with a vent hole connecting the first step hole inside the base 1012 and the sealing gasket installation groove; the exhaust hole is used to allow the internal gas to be discharged when the armature seat 303 is pressed into the armature 305, and the vent hole is used to allow the internal gas to be discharged when the sealing gasket 304 is pressed into the armature seat 303.

[0108] Example 13: (This example is a modified structure of Example 12, except that the installation position of the sealing gasket is different)

[0109] On the basis of Example 1, referring to FIG5 , a mounting groove is provided on the top of the valve body 11 , a hollow gasket 306 is installed in the mounting groove, and a protruding structure adapted to the hollow portion of the gasket 306 is provided on the bottom of the armature seat 303 .

[0110] Example 14:

[0111] On the basis of Example 1, referring to Figure 7, the spring piece 302 includes a first ring 3021 and a second ring 3022, the diameter of the first ring 3021 is smaller than that of the second ring 3022, the first ring 3021 and the second ring 3022 are connected together by at least three reciprocating bending structures 3023, the reciprocating bending structure 3023 includes a bending section 30231, and the width of the bending section 30231 is greater than other parts of the reciprocating bending structure 3023.

[0112] Example 15:

[0113] On the basis of Example 1, with reference to Figures 1-2 and 8, a valve body gasket 10 is installed between the spring piece 302 and the valve body 11, thereby pressing the spring piece 302. After being pressed, the shape of the spring piece 302 is a bowl shape with the four sides on top and the middle at the bottom; of course, the valve body gasket 10 can also be replaced by adding a corresponding structure on the valve body 11. Figure 2 shows a schematic diagram of the structure after the valve body gasket 10 is removed on the basis of Example 1; a lift adjustment gasket 9 is installed between the spring piece 302 and the inner top wall of the base 1012; specifically, the lift adjustment gasket 9 and the valve body gasket 10 are both ring structures, and the lift adjustment gasket The outer diameter of the plate 9 and the valve body gasket 10 matches the diameter of the threaded bottom hole at the bottom of the base 1012. The inner diameter of the lift adjustment gasket 9 and the valve body gasket 10 is larger than the inner diameter of the outer ring of the spring piece 302. The thickness of the lift adjustment gasket 9 can be selected in a variety of specifications. Through the lift adjustment gasket 9 of different thicknesses, the distance between the boss of the armature 305 and the magnetic isolation gasket 13 installed on the inner side of the bottom of the tight cap 102 can be adjusted; of course, the lift adjustment gasket 9 can also be replaced by adding a step on the base 1012. Figure 8 shows a schematic diagram of the structure after removing the lift adjustment gasket 9 on the basis of Example 1.

[0114] Working principle:

[0115] When the proportional valve is powered off, the sealing gasket 304 at the bottom of the armature assembly 3 is compressed by the armature spring 12 and contacts the boss on the top of the valve body 11 to form a sealing surface, and no gas flows between the air inlet 14 and the air outlet 15.

[0116] When the proportional valve is energized, the armature assembly 3 moves upward under the action of the electromagnetic force, overcoming the spring force of the armature spring 12 , the sealing surface is opened, and the gas flows from the air inlet 14 to the air outlet 15 .

[0117] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A proportional valve, characterized in that: include: A welding body component (1), comprising a welding component (101) and a tightening cap (102) connected to the welding component (101); the welding component (101) comprises a magnetic isolation sleeve (1011) and a base (1012) connected to the magnetic isolation sleeve (1011), and a valve body (11) is arranged at the lower part of the base (1012); An armature assembly (3) comprises a spring piece (302), an armature seat (303) and an armature mechanism, wherein the armature seat (303) is mounted on the bottom of the armature mechanism and presses the spring piece (302) between the armature mechanism and the armature seat (303); an armature spring (12) is sleeved on the outer side of the upper portion of the armature mechanism, a guide mechanism for guiding the moving direction of the armature mechanism is installed inside the tightening cap (102), the bottom of the guide mechanism is arranged as a hollow structure, and the upper portion of the armature mechanism is located in the hollow structure at the bottom of the guide mechanism; The coil assembly (4) is sleeved on the outside of the magnetic isolation sleeve (1011).

2. The proportional valve according to claim 1, characterized in that: A valve body gasket (10) is installed between the spring sheet (302) and the valve body (11); and a lift adjustment gasket (9) is installed between the spring sheet (302) and the inner top wall of the base (1012).

3. The proportional valve according to claim 1, characterized in that: The armature mechanism comprises a shaft (301) and an armature (305); a second step hole is provided at the top of the armature (305); the lower end of the shaft (301) is located in the second step hole; a spring guide hole is formed between the inner wall of the upper end of the second step hole and the outer wall of the shaft (301); the armature spring (12) is sleeved on the outer side of the armature (305); and the lower end of the armature spring (12) is arranged in the spring guide hole.

4. The proportional valve according to claim 1, characterized in that: The guide mechanism is an adjusting screw plug assembly (2), the adjusting screw plug assembly (2) comprising an adjusting screw plug (203), a through hole being provided inside the tightening cap (102), the adjusting screw plug (203) being threadedly connected to the inner wall of the tightening cap (102), the bottom of the adjusting screw plug (203) being a hollow structure, the armature mechanism comprising a shaft (301) and an armature (305), and a second step hole being provided at the top of the armature (305).

5. The proportional valve according to claim 4, characterized in that: The inner wall at the bottom of the adjusting screw plug (203) is provided with a bearing installation groove, in which a bearing (202) is installed. The upper end of the shaft (301) is installed inside the bearing (202), and the lower end of the shaft (301) is pressed into the second step hole at the top of the armature (305).

6. The proportional valve according to claim 4, characterized in that: A bearing (202) is installed in the second step hole at the top of the armature (305), the lower end of the shaft (301) is installed inside the bearing (202), and the upper end of the shaft (301) is pressed into the hollow structure at the bottom of the adjusting screw plug (203).

7. The proportional valve according to claim 1, characterized in that: A boss (10121) is provided on the top of the base (1012), the bottom of the coil assembly (4) abuts against the boss (10121), and the outer wall of the locking cap (102) located above the coil assembly (4) is threadedly connected with a hexagonal thin nut (5).

8. The proportional valve according to claim 1, characterized in that: A flange is provided on the outer side of the upper part of the valve body (11), and the flange is provided with an external thread. A first step hole is provided inside the base (1012), and the valve body (11) is installed inside the first step hole. The external thread of the flange matches the internal thread at the lower end of the first step hole inside the base (1012), and at least one air outlet hole (15) is axially penetrated through the flange, and an air inlet hole (14) is axially penetrated through the middle part of the valve body (11).

9. The proportional valve according to claim 1, characterized in that: The lower end side wall of the base (1012) is provided with an external thread, and the base (1012) is provided with a first step hole inside, the first step hole includes a first through hole close to the outside and a second through hole close to the inner cavity, and the diameter of the second through hole is smaller than the first through hole; the armature mechanism includes a shaft (301) and an armature (305), and the side wall of the armature (305) is provided with a magnetic isolation groove (3051) at a position close to the lower part of the second through hole.

10. The proportional valve according to claim 1, characterized in that: The side wall at the bottom of the tightening cap (102) is a boss structure, the armature mechanism comprises a shaft (301) and an armature (305), and a groove for the side wall at the bottom of the tightening cap (102) to enter and exit is provided on the outer side of the top of the armature (305).

11. The proportional valve according to claim 1, characterized in that: The armature mechanism comprises a shaft (301) and an armature (305); the side wall at the top of the armature (305) is a boss structure; and a groove for the side wall at the top of the armature (305) to enter and exit is provided on the outer side of the bottom of the tightening cap (102).

12. The proportional valve according to claim 1, characterized in that: The armature mechanism comprises a shaft (301) and an armature (305), and a magnetic isolation gasket (13) is installed at the bottom of the tightening cap (102) or the top of the armature (305).

13. The proportional valve according to claim 1, characterized in that: A sealing gasket installation groove is provided at the bottom of the armature seat (303), and a sealing gasket (304) is installed in the sealing gasket installation groove; an air inlet hole (14) is axially penetrated through the middle of the valve body (11), and a hollow conical boss is provided at the top of the valve body (11), the hollow part of the conical boss is connected to the air inlet hole (14), and the sealing gasket (304) is located above the hollow part of the conical boss.

14. The proportional valve according to claim 1, characterized in that: The top of the valve body (11) is provided with a mounting groove, in which a hollow gasket (306) is installed, and the bottom of the armature seat (303) is provided with a protruding structure adapted to the hollow part of the gasket (306).

15. The proportional valve according to claim 1, characterized in that: The spring piece (302) comprises a first circular ring (3021) and a second circular ring (3022), the diameter of the first circular ring (3021) is smaller than that of the second circular ring (3022), the first circular ring (3021) and the second circular ring (3022) are connected together via at least three reciprocating bending structures (3023), the reciprocating bending structure (3023) comprises a bending section (30231), and the width of the bending section (30231) is greater than other parts of the reciprocating bending structure (3023).

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