Small-drift-diameter miniature proportional electromagnetic valve

Abstract

The utility model discloses a small-drift-diameter miniature proportional electromagnetic valve, and aims to overcome the defect that a proportional electromagnetic valve with a structure capable of directly influencing the flow control precision is lacked in the prior art. Comprising a valve body, and an inlet, an outlet and a sealing opening formed in the inlet and outlet path are formed in the valve body; the sealing opening is of a split structure and comprises a small hole element and a metal base provided with a stepped hole, and the small hole element is embedded in the stepped hole of the metal base; the valve element assembly comprises an armature, a stepped hole is formed in the upper end of the armature, a sealing gasket is arranged in the stepped hole, and the sealing gasket makes contact with the sealing opening when the valve is sealed. The electromagnet assembly is arranged on the lower portion of the electromagnetic valve and connected with the lower portion of the armature. The machining difficulty is reduced, the machining quality and consistency are improved, and therefore the flow control precision of the proportional electromagnetic valve is improved. And meanwhile, the stability and precision of flow control are also improved through the design of the valve element assembly.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, specifically to a small-diameter miniature proportional solenoid valve. Background Technology

[0002] In the field of fluid control, proportional solenoid valves, as a key control element, are widely used in various scenarios requiring precise flow control. Currently, proportional solenoid valves on the market mainly consist of sealing structures made of metal materials. For example, some small-diameter miniature proportional solenoid valves use a one-piece metal sealing port, achieving flow control through precise machining. These metal sealing ports typically possess good mechanical strength and pressure resistance, with a minimum orifice diameter of 0.0762 mm, meeting the flow control requirements of general industrial applications. However, as the requirements for flow control accuracy in fluid control equipment continue to increase, existing technologies are gradually revealing some shortcomings.

[0003] Patent CN115492933A discloses a frictionless, high-stability proportional solenoid valve. By using a slotted disc spring instead of a traditional helical spring and designing a novel armature assembly, it effectively avoids friction and radial wobble between the armature assembly and the inner wall of the solenoid valve, thus improving the valve's operational stability and response characteristics. However, this solution primarily focuses on addressing the motion stability of the armature assembly, paying less attention to achieving smaller diameter and more precise flow control, making it difficult to meet the growing demand for fine flow control.

[0004] Another patent, CN117090949A, designs a gas pressure compensation structure. It uses a rubber diaphragm to divide the solenoid valve cavity into upper and lower parts, allowing gas pressure to act on the valve core assembly and valve seat, thereby enhancing the sealing effect of the valve core assembly and improving flow control accuracy. While this solution achieves some progress in improving flow control accuracy, its complex structural design may lead to higher power consumption, greater assembly difficulty, and potentially insufficient flow stability in the long run. Especially after prolonged operation, the complex structure may affect flow stability due to factors such as thermal expansion.

[0005] In summary, these methods typically only indirectly affect flow control accuracy, and their control effect is limited within small flow ranges. Therefore, a new technical solution is urgently needed to address the shortcomings of existing proportional solenoid valves in small-diameter flow control, sealing performance, and long-term operational stability, in order to meet the market, industry, and user demands for high-precision, low-power, and stable and reliable flow control technology. Thus, overcoming the shortcomings of existing small-diameter micro proportional solenoid valves in the field of fluid control technology, such as large diameter, poor sealing performance, and long-term flow rate attenuation, has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The utility model discloses a small-bore miniature proportional solenoid valve, which can overcome the shortage of the prior art that lacks a proportional solenoid valve capable of directly affecting the flow control precision.

[0007] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] A small-bore miniature proportional solenoid valve, comprising:

[0009] The valve body assembly comprises a valve body, an inlet, an outlet and a sealing port arranged at the inlet and outlet path are formed in the valve body; the sealing port is of a split structure, comprising a small-hole element and a metal base provided with a stepped hole, and the small-hole element is inlaid in the stepped hole of the metal base;

[0010] The valve core assembly comprises an armature, and a stepped hole is arranged at the upper end of the armature, and a sealing gasket is arranged in the stepped hole; the sealing gasket is in contact with the sealing port when the valve is sealed;

[0011] The electromagnet assembly is arranged at the lower part of the solenoid valve and connected with the lower part of the armature.

[0012] The valve core assembly further comprises a leaf spring, and a shoulder is arranged at the outer part of the armature, and the leaf spring is arranged below the shoulder.

[0013] A stepped ring groove is arranged at the upper end of the contact position of the inlaid position of the armature and the sealing gasket.

[0014] The small-hole element is made of high-density hard material.

[0015] The small-hole element is made of artificial corundum.

[0016] The small-hole element is made of ceramic.

[0017] The valve core assembly further comprises a pressing cap, and the pressing cap is arranged above the sealing gasket.

[0018] The valve core assembly further comprises a bearing steel ball, and the bearing steel ball is arranged below the sealing gasket.

[0019] The electromagnet assembly further comprises a stop iron assembly, and the stop iron assembly is arranged below the armature, and a coil assembly is arranged outside the stop iron assembly, and a yoke iron is fixed outside the coil assembly.

[0020] A screw thread is arranged at the lower end of the stop iron assembly, and the lower end of the yoke iron is fixed to the lower end of the stop iron assembly through a nut, and a gasket is arranged between the nut and the yoke iron.

[0021] Compared with the prior art, the utility model has the following beneficial technical effects:

[0022] The utility model provides a small drift miniature proportional solenoid valve, through the innovative split type sealing mouth structure overcomes the prior art's insufficient, split type sealing mouth is composed by small hole element and the metal base with step hole, small hole element inlay in the step hole of metal base, has reduced the processing difficulty, has improved processing quality and consistency, thereby has promoted the flow control precision of proportional solenoid valve. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is small drift miniature proportional solenoid valve structure schematic diagram in the utility model embodiment.

[0024] Figure 2 It is small drift miniature proportional solenoid valve sealing mouth structure schematic diagram in the utility model embodiment.

[0025] Figure 3 It is small drift miniature proportional solenoid valve step ring groove structure schematic diagram in the utility model embodiment.

[0026] In the drawing, 1 valve body;2 sealing mouth;201 small hole element 202 metal base;3 press cap;4 sealing washer;5 bearing steel ball;6 leaf spring;7 armature;701 step ring groove;8 stopper assembly;9 coil assembly;10 yoke iron;11 gasket;12 nut. DETAILED DESCRIPTION

[0027] In prior art, along with the fluid control equipment to the flow control precision requirement ceaselessly promotes, the minimum drift of miniature proportional solenoid valve has not been able to satisfy actual demand. The sealing mouth of traditional miniature proportional solenoid valve adopts metal integration processing, this processing mode is extremely high in difficulty, cost is extremely great when manufacturing superfine long hole, and difficult to guarantee the roughness and roundness of inner hole and other processing consistency, lead to fluid resistance increase, flow capacity is limited, further influence flow control precision. Meanwhile, the sealing mouth of metal material in the miniaturization process, processing difficulty and cost sharp rise, difficult to realize smaller drift precision control. At present, the minimum drift of small drift miniature proportional solenoid valve on market adopts metal material processing and is made, and the minimum aperture is 0.0762mm.

[0028] To solve the minimum drift of existing miniature proportional solenoid valve is bigger problem, the utility model provides a kind of miniature proportional solenoid valve with minimum drift up to 0.03mm. The utility model adopts the sealing mouth combination piece of inlay structure, and the minimum drift can reach 0.03mm, can realize the precision control to tiny flow;Sealing mouth is made of artificial corundum or ceramic material, compared with metal, and the sealing effect of rubber is better, reduces sealing force requirement, can reduce proportional solenoid valve power consumption.

[0029] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0030] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be connected internally between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several" is two or more, unless otherwise explicitly specified and limited.

[0033] Referring to Figure 1 The utility model provides a kind of specific implementation of a kind of small-bore miniature proportional solenoid valve, comprising:

[0034] Valve body assembly, including valve body 1, the inside of the valve body 1 is opened with import, export and the sealing mouth 2 being arranged at import and export path;Sealing mouth 2 is split structure, including small hole element 201 and the metal base 202 with stepped hole, the small hole element 201 is inlaid in the stepped hole of metal base 202;

[0035] The valve core assembly includes an armature 7, the upper end of which is provided with a stepped hole, and a sealing gasket 4 is provided in the stepped hole. When the valve is sealed, the sealing gasket 4 contacts the sealing port 2.

[0036] An electromagnet assembly is disposed at the lower part of the solenoid valve and connected to the lower part of the armature 7.

[0037] The valve core assembly achieves sealing under the deformation force of the leaf spring, thus closing the valve. Under the attraction of the electromagnet assembly, the valve core assembly overcomes the deformation force of the leaf spring and moves downward, thus opening the valve.

[0038] like Figure 2 As shown, the sealing port 2 adopts a split structure, with the small hole element 201 embedded in the stepped hole of the metal base 202. Traditional integrated sealing port structures use a single piece of metal for machining. However, because the depth of such ultra-fine, long holes is much greater than their diameter, the cutting tool is prone to vibration and deviation during machining, making it difficult to guarantee the straightness, roundness, and surface roughness of the hole, resulting in low machining efficiency and high cost. Compared to the traditional integrated sealing port structure, this invention separates the ultra-fine, long holes (those with a depth-to-diameter ratio greater than 10) that would otherwise require direct machining, thus significantly reducing machining difficulty. Furthermore, the small hole element 201 of this invention is made of high-density hard materials such as artificial corundum and ceramics, further ensuring the surface machining quality and consistency of the inner hole of the small hole element 201, increasing the flow capacity of the proportional valve while effectively improving the control accuracy of the proportional solenoid valve.

[0039] like Figure 1 , Figure 2 As shown, the valve core assembly includes an armature 7. A sealing gasket 4 is provided in the stepped hole at the upper end of the armature 7 to achieve valve sealing. The sealing gasket 4 is pressed by the pressure cap 3 to prevent the sealing gasket from falling axially. A bearing steel ball 5 is provided at the lower end of the sealing gasket to straighten the sealing gasket, prevent the sealing gasket from tilting, and improve the sealing effect of the sealing gasket.

[0040] like Figure 1 , Figure 3 As shown, a stepped annular groove 701 is provided at the upper end of the contact position between the armature 7 and the sealing gasket 4, which increases the radial expansion space of the sealing gasket, reduces the influence of the axial expansion of the sealing gasket caused by heat on the valve opening, and effectively improves the flow attenuation problem of the proportional solenoid valve due to heat generation during long-term operation.

[0041] To make the solution provided by this utility model easier to understand, its working principle will be further explained below.

[0042] The utility model discloses a small drift miniature proportional solenoid valve can be used to the control and the stepless adjustment of the gas flow size of the internal gas path of gas chromatograph, high-precision mass flow controller and other instrument equipment, belongs to the field of fluid control technology.

[0043] Referring to Figure 1 Small drift miniature proportional solenoid valve body is equipped with import a and export b, armature 7 includes movable armature and fixed armature. Movable armature and sealing washer 4 are combined to form a whole through press fitting. Under the condition of power off, leaf spring 6 tightly presses movable armature, sealing washer 4 is tightly pressed on the small hole element 201 on the top of sealing mouth 2, and valve core assembly realizes sealing under the deformation force of leaf spring 6, and the valve is closed. After power on, the electromagnetic coil of coil assembly 9 generates suction force and attracts movable armature, drives sealing washer 4 to move downward, and the joint surface of sealing washer 4 and small hole element 201 on the top of sealing mouth 2 is separated, and valve core assembly moves downward under the suction force of coil assembly 9 and overcomes the deformation force of leaf spring 6, and the proportional solenoid valve is opened, and import a and export b are connected. The opening size of the joint surface of sealing washer 4 and sealing mouth 2 is under the joint action of the current loaded by coil assembly 9 and leaf spring 6, and the opening size is adjusted.

[0044] The utility model discloses a small hole element 201 made of artificial corundum or ceramic material is inlaid in metal base 202 and constitutes sealing mouth 2 combined component together, wherein the end face of the small hole element 201 inlaid in metal base 202 constitutes sealing surface and directly contacts with sealing washer 4. Compared with the miniature proportional solenoid valve whose sealing mouth is entirely made of metal, the sealing effect is better, the sealing force requirement is reduced, thereby the power consumption of the proportional solenoid valve can be reduced, and the miniaturization of the proportional solenoid valve is facilitated.

[0045] The small drift miniature proportional solenoid valve of the utility model adopts the sealing mouth combined component of inlaid structure, and the smallest drift can reach 0.03mm, compared with the miniature proportional solenoid valve whose sealing mouth is entirely made of metal, the processing workability is stronger, the hole inner wall roughness of the small hole element made of artificial corundum or ceramic material is higher, thereby the flow passage flow resistance of the proportional solenoid valve is smaller, the flow control is more stable, and the flow control precision of the proportional solenoid valve can be greatly improved.

[0046] The basic principle, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the utility model and are not intended to limit the utility model. Without departing from the spirit and scope of the utility model, various changes and improvements can be made to the utility model, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A small-diameter miniature proportional solenoid valve, characterized in that, include: The valve body assembly includes a valve body (1), which has an inlet, an outlet and a sealing port (2) located at the inlet and outlet paths; the sealing port (2) is a split structure, including a small hole element (201) and a metal base (202) with a stepped hole, wherein the small hole element (201) is embedded in the stepped hole of the metal base (202); The valve core assembly includes an armature (7), the upper end of which is provided with a stepped hole, and a sealing gasket (4) is provided in the stepped hole. When the valve is sealed, the sealing gasket (4) contacts the sealing port (2). An electromagnet assembly is disposed at the lower part of the solenoid valve and connected to the lower part of the armature (7).

2. The small-diameter miniature proportional solenoid valve according to claim 1, characterized in that, The valve core assembly also includes a leaf spring (6), and the armature (7) has a shoulder on its outside, with the leaf spring (6) installed below the shoulder.

3. A small-diameter miniature proportional solenoid valve according to claim 1, characterized in that, The upper end of the contact position between the armature (7) and the sealing gasket (4) is provided with a stepped annular groove (701).

4. A small-diameter miniature proportional solenoid valve according to claim 1, characterized in that, The orifice element (201) is made of a high-density hard material.

5. A small-diameter miniature proportional solenoid valve according to claim 4, characterized in that, The small hole element (201) is made of artificial corundum.

6. A small-diameter miniature proportional solenoid valve according to claim 4, characterized in that, The orifice element (201) is made of ceramic.

7. A small-diameter miniature proportional solenoid valve according to claim 1, characterized in that, The valve core assembly also includes a pressure cap (3), which is mounted above the sealing gasket (4).

8. A small-diameter miniature proportional solenoid valve according to claim 1, characterized in that, The valve core assembly also includes a bearing ball (5), which is mounted below the sealing gasket (4).

9. A small-diameter miniature proportional solenoid valve according to claim 1, characterized in that, The electromagnet assembly also includes a stop assembly (8), which is located below the armature (7) and has a coil assembly (9) on its outside. A yoke (10) is fixed outside the coil assembly (9).

10. A small-diameter miniature proportional solenoid valve according to claim 9, characterized in that, The lower end of the stop assembly (8) is provided with a thread, and the lower end of the yoke (10) is fixed to the lower end of the stop assembly (8) by a nut (12). A washer (11) is placed between the nut (12) and the yoke (10).

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