Magnet device for valve position indicator and preparation method thereof

Abstract

A magnet device for a valve position indicator includes a magnetic ring assembly, which includes a plastic ring and a magnet, wherein the magnet is embedded on one side of the outer peripheral surface of the plastic ring; a clamping assembly, which includes a rubber gasket of an annular structure, wherein the end faces of the rubber gasket are axially attached to a cylinder, wherein the outer edges of the ends of the cylinder are axially provided with annular flanges, wherein the two annular flanges are relatively enclosed to form an annular groove, wherein the two magnetic ring assemblies are axially fixedly clamped in the corresponding annular grooves, and the magnets in the two magnetic ring assemblies face opposite directions; the end face of the cylinder is radially symmetrically provided with screw holes inwardly, and the end face of the rubber gasket is radially symmetrically provided with through holes inwardly, wherein the through holes are axially docked with the two screw holes, and are screwed and locked by screwing. The present invention can effectively perform axial limit clamping on the magnetic ring assembly, so that the spacing between the two magnetic ring assemblies is relatively fixed, and axial displacement is not easy to occur during actual use.

Description

Technical Field

[0001] The invention belongs to the technical field of valve position indicator accessories, and in particular relates to a magnet device for a valve position indicator and a preparation method thereof. Background Art

[0002] The valve position indicator is a field instrument for detecting the status of the fluid valve. It outputs the open or closed signal of the fluid valve as the basis for controlling the next action of the fluid valve. Fluid valves of different sizes need to be equipped with valve position indicators of different specifications. The valve position indicator is directly installed on the top of the shaft end of the fluid valve, and the valve position indicator is directly associated with the valve stem of the fluid valve for driving.

[0003] In the prior art, the two sets of magnetic ring assemblies used in the magnetic induction valve position indicator are generally manually axially spaced and sleeved on the hose, and then the hose and the linear shaft are axially interference sleeved. However, due to manual errors in this assembly method, the spacing between the two sets of magnetic ring assemblies is not easy to accurately grasp. In addition, in actual use, due to the thermal expansion and contraction characteristics of the hose, axial displacement is prone to occur between the magnetic ring assembly and the hose, which will change the position correspondence between the magnetic ring assembly and the magnetic induction microswitch in the valve position indicator, thereby affecting the opening or closing signal output of the fluid valve. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a magnet device for a valve position indicator and a preparation method thereof. The specific technical scheme is as follows:

[0005] A magnet device for a valve position indicator, the magnet device comprising:

[0006] A magnetic ring assembly, comprising a plastic ring and a magnet, wherein the magnet is embedded on one side of the outer peripheral surface of the plastic ring;

[0007] A clamping assembly comprises a rubber gasket of an annular structure, the end faces of the rubber gasket are axially attached to cylinders, the outer edges of the ends of the cylinders are axially provided with annular flanges, the two annular flanges are relatively surrounded by an annular groove, the two magnetic ring assemblies are axially fixed in the corresponding annular grooves, and the magnets in the two magnetic ring assemblies face opposite directions; the end face of the cylinder is radially symmetrically penetrated by screw holes, the end face of the rubber gasket is radially symmetrically penetrated by through holes, the through holes are axially docked with the two screw holes, and are screwed and locked by screws.

[0008] Furthermore, the cylinder in the clamping assembly is cut in half along the middle thereof to form a split structure.

[0009] Furthermore, the valve position indicator comprises a shell having an accommodating space inside which is formed by combining an upper end cover and a lower end cover, a linear shaft being vertically inserted through the middle of the shell, and the linear shaft being rotatably connected to the corresponding upper end cover and lower end cover respectively through bearings; a signal indicating cover is axially clamped at the top end of the linear shaft; the bottom end of the linear shaft is connected to the external fluid valve stem; the cylinder of the magnet device is axially interference fit with the linear shaft in the shell, two magnetic induction micro switches are longitudinally spaced apart on one side of the inner bottom surface of the lower end cover, each of the magnetic induction micro switches is laterally arranged opposite to the corresponding magnetic ring assembly, and a signal transmission terminal row is mounted on the other side of the inner bottom surface of the lower end cover, and the signal transmission terminal row is electrically connected to the corresponding magnetic induction micro switches through wires.

[0010] Furthermore, an annular support plate is axially fixedly arranged on the linear shaft, and the top surface of the annular support plate is supported and abutted against the bottom surface of the cylinder below the magnet device.

[0011] Furthermore, the outer spacer sleeve of the signal indicator cover is fitted with a transparent cover.

[0012] A method for preparing a magnet device for a valve position indicator, the method comprising the following steps:

[0013] Step S1: Preparation of magnetic ring assembly

[0014] First, a non-magnetized magnet is produced, then the non-magnetized magnet and the plastic ring are integrally injection-molded into the magnetic ring assembly by an injection molding machine, and finally, the magnet in the magnetic ring assembly is magnetized;

[0015] Step S2: Preparation of card assembly

[0016] First, a cylinder with the annular flange at the end is integrally injection-molded by an injection molding machine, and the cylinder is cut in half by a cutting machine; then, the rubber gasket is cut and produced, and a screw rod adapted thereto is processed and set aside;

[0017] Step S3: Assembly of the magnet device

[0018] First, the cylinders split in half are axially inserted into the plastic rings corresponding to the magnetic ring assemblies respectively; then, the two cylinders with the magnetic ring assemblies clamped are respectively attached to the end faces of the rubber washers, and the through holes of the rubber washers are kept axially connected with the corresponding screw holes on both sides thereof; finally, the magnet device is assembled by screwing and locking the screws with the corresponding screw holes.

[0019] Furthermore, in the step S1, the temperature of the magnetic ring assembly is maintained at 100-110° C. during injection molding.

[0020] The beneficial effects of the present invention are:

[0021] The clamping assembly provided in the magnet device for the valve position indicator of the present invention adopts two cylinders with an I-shaped structure in appearance, which can effectively limit the axial position of the magnetic ring assembly and lock the two cylinders by axially screwing them together through a screw, so that the spacing between the two magnetic ring assemblies is relatively fixed, and it is not easy to cause axial displacement during actual use, and it will not change the position correspondence between the magnetic ring assembly and the magnetic induction microswitch in the valve position indicator, and will not affect the opening or closing signal output of the fluid valve; at the same time, a rubber gasket is sandwiched between the two cylinders, which will increase the tightness of the axial connection between the two cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-dimensional structure of the magnetic ring assembly in the present invention is shown;

[0023] Figure 2 A structural cross-sectional view of the clamping assembly in the present invention is shown;

[0024] Figure 3 The schematic diagram of the exploded structure of the cylinder in the present invention is shown;

[0025] Figure 4 A structural cross-sectional view of the rubber gasket in the present invention is shown;

[0026] Figure 5 A cross-sectional view of the assembly structure of the magnet device of the present invention is shown;

[0027] Figure 6 A structural cross-sectional view of the valve position indicator of the present invention is shown;

[0028] Figure 7 A flow chart showing a method for preparing a magnet device for a valve position indicator according to the present invention is shown.

[0029] As shown in the figure: 1. Magnetic ring assembly; 11. Plastic ring; 12. Magnet; 2. Card-mounted assembly; 21. Cylinder; 211. Annular flange; 212. Annular slot; 213. Screw hole; 22. Screw; 23. Rubber gasket; 231. Through hole; 3. Shell; 31. Upper end cover; 32. Lower end cover; 4. Linear travel shaft; 41. Bearing; 42. Annular support plate; 5. Signal indication cover; 51. Transparent cover; 6. Magnetic induction micro switch; 7. Signal transmission terminal block. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] like Figures 1 to 5 As shown, a valve position indicator uses a magnet device, which includes:

[0032] The magnetic ring assembly 1 comprises a plastic ring 11 and a magnet 12, wherein the magnet 12 is embedded on one side of the outer peripheral surface of the plastic ring 11;

[0033] The clamping assembly 2 comprises a rubber gasket 23 of an annular structure, the end faces of the rubber gasket 23 are axially attached to the cylinder 21, the outer edges of the ends of the cylinder 21 are axially provided with annular flanges 211, the two annular flanges 211 are relatively surrounded by an annular groove 212, the two magnetic ring assemblies 1 are axially fixed in the corresponding annular grooves 212, and the magnets 12 in the two magnetic ring assemblies 1 face opposite directions; the end face of the cylinder 21 is radially symmetrically penetrated with screw holes 213, the end face of the rubber gasket 23 is radially symmetrically penetrated with through holes 231, the through holes 231 are axially docked with the two screw holes 213, and are screwed and locked by a screw 22.

[0034] By adopting the above technical solution, the clamping assembly 2 set in the magnet device for the valve position indicator adopts two cylinders 21 with an I-shaped structure, which can effectively limit the axial position of the magnetic ring assembly 1, and the two cylinders 21 are axially screwed and locked by the screw 22, so that the distance between the two magnetic ring assemblies 1 is relatively fixed, and it is not easy to cause axial displacement during actual use, and it will not change the position correspondence between the magnetic ring assembly 1 and the magnetic induction micro switch 6 in the valve position indicator, and will not affect the output of the opening or closing signal of the fluid valve; at the same time, a rubber gasket 23 is sandwiched between the two cylinders 21, which will increase the tightness of the axial connection between the two cylinders 21. Among them, the magnets 12 in the two magnetic ring assemblies 1 face opposite directions, which can be used to indicate the degree of opening or closing of the fluid valve respectively.

[0035] like Figure 3 As shown, the cylinder 21 in the clamping assembly 2 is cut in half along the middle to form a split structure.

[0036] By adopting the above technical solution, the cylinder 21 adopts a split structure, which can facilitate the disassembly, assembly and replacement between the magnetic ring assembly 1 and the cylinder 21, thereby reducing unnecessary maintenance costs.

[0037] like Figure 6As shown, the valve position indicator comprises a shell 3 with an accommodating space formed by a mold of an upper end cover 31 and a lower end cover 32, a linear shaft 4 is vertically inserted through the middle of the shell 3, and the linear shaft 4 is rotatably connected with the corresponding upper end cover 31 and lower end cover 32 through bearings 41 respectively; a signal indicating cover 5 is axially clamped at the top of the linear shaft 4; the bottom end of the linear shaft 4 is connected to the external fluid valve stem; the cylinder 21 of the magnet device is axially interference-fitted with the linear shaft 4 in the shell 3, two magnetic induction micro switches 6 are longitudinally spaced on one side of the inner bottom surface of the lower end cover 32, each of the magnetic induction micro switches 6 is laterally arranged opposite to the corresponding magnetic ring assembly 1, and a signal transmission terminal row 7 is mounted on the other side of the inner bottom surface of the lower end cover 32, and the signal transmission terminal row 7 is electrically connected with the corresponding magnetic induction micro switch 6 through wires.

[0038] By adopting the above technical solution, the layout of the components in the housing 3 can be compact and reasonable, and the operation can be smooth.

[0039] like Figure 6 As shown, an annular support plate 42 is axially fixedly provided on the linear shaft 4, and the top surface of the annular support plate 42 is supported and abutted against the bottom surface of the cylinder 21 below the magnet device.

[0040] By adopting the above technical solution, the annular support plate 42 can further provide auxiliary longitudinal support for the entire magnet device to prevent the magnet device and the linear shaft 4 from axial displacement due to long-term use or severe vibration.

[0041] like Figure 6 As shown, the outer space of the signal indicating cover 5 is sleeve-fitted with a transparent cover 51 .

[0042] By adopting the above technical solution, the transparent cover 51 does not hinder the observation of the rotation position of the signal indicating cover 5, and can also provide moisture-proof and dust-proof protection for the signal indicating cover 5.

[0043] like Figure 7 As shown, a method for preparing a magnet device for a valve position indicator comprises the following steps:

[0044] Step S1: Preparation of magnetic ring assembly

[0045] First, a non-magnetized magnet 12 is manufactured, and then the non-magnetized magnet 12 and the plastic ring 11 are integrally injection-molded into the magnetic ring assembly 1 by an injection molding machine, and finally, the magnet 12 in the magnetic ring assembly 1 is magnetized;

[0046] Step S2: Preparation of card assembly

[0047] First, the cylinder 21 with the annular flange 211 at the end is integrally injection-molded by an injection molding machine, and the cylinder 21 is cut into half by a cutting machine; then, the rubber gasket 23 is cut and produced, and the screw 22 adapted thereto is processed and set aside;

[0048] Step S3: Assembly of the magnet device

[0049] First, the cylinder 21 split in half is axially inserted into the plastic ring 11 of the corresponding magnetic ring assembly 1 respectively; then, the two cylinders 21 with the magnetic ring assembly 1 are respectively attached to the end faces of the rubber gasket 23, and the through hole 231 of the rubber gasket 23 is kept axially connected with the corresponding screw holes 213 on both sides thereof; finally, the screw rod 22 is screwed and locked with the corresponding screw holes 213 to form the magnet device.

[0050] By adopting the above technical solution, the magnet 12 and the plastic ring 11 are integrated by injection molding. Compared with the method of first punching a hole on the surface of the plastic ring 11 and then embedding the magnet 12 in the prior art, the assembly tightness of the magnet 12 and the plastic ring 11 is better; in addition, the magnet 12 is injection molded together with the plastic ring 11 without magnetization, and then magnetized after the injection molding is completed, in order to prevent the temperature from changing the magnetic force of the magnet 12 during the injection molding process, resulting in different signals or even no signal sensed and received by the magnetic induction micro switch 6.

[0051] like Figure 2 As shown, in step S1, the temperature of the magnetic ring assembly 1 is maintained at 100-110° C. during injection molding.

[0052] By adopting the above technical solution, the temperature is kept between 100 and 110° C., which can better ensure that the magnet 12 will not undergo magnetic force changes during subsequent magnetization.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnet device for a valve position indicator, characterized in that: The magnet device comprises: A magnetic ring assembly (1), comprising a plastic ring (11) and a magnet (12), wherein the magnet (12) is embedded on one side of the outer peripheral surface of the plastic ring (11); A clamping assembly (2), comprising a rubber gasket (23) of an annular structure, the end faces of the rubber gasket (23) are axially attached to the cylinder (21), the outer edges of the ends of the cylinder (21) are axially provided with annular flanges (211), the two annular flanges (211) are relatively surrounded to form an annular clamping groove (212), the two magnetic ring assemblies (1) are axially fixedly clamped in the corresponding annular clamping grooves (212), and the magnets (12) in the two magnetic ring assemblies (1) face opposite directions; the end face of the cylinder (21) is radially symmetrically penetrated with a screw hole (213) inwardly, the end face of the rubber gasket (23) is radially symmetrically penetrated with a through hole (231), the through hole (231) is axially butted with the two screw holes (213), and are screwed and locked by a screw rod (22); The cylinder (21) in the clamping assembly (2) is cut in half along the middle thereof to form a split structure; The valve position indicator comprises a housing (3) formed by combining an upper end cover (31) and a lower end cover (32) and having an internal accommodation space; a linear shaft (4) is vertically inserted through the middle of the housing (3); the linear shaft (4) is rotatably connected to the corresponding upper end cover (31) and lower end cover (32) via bearings (41); a signal indicating cover (5) is axially clamped at the top end of the linear shaft (4); the bottom end of the linear shaft (4) is connected to an external fluid valve stem; the magnet device The cylinder (21) is axially interference fit with the linear shaft (4) in the housing (3); two magnetic induction micro switches (6) are longitudinally spaced apart on one side of the inner bottom surface of the lower end cover (32); each magnetic induction micro switch (6) is laterally arranged opposite to the corresponding magnetic ring assembly (1); a signal transmission terminal block (7) is arranged on the other side of the inner bottom surface of the lower end cover (32); and the signal transmission terminal block (7) is electrically connected to the corresponding magnetic induction micro switch (6) through wires.

2. The valve position indicator magnet device according to claim 1, characterized in that: An annular support plate (42) is axially fixedly arranged on the linear shaft (4), and the top surface of the annular support plate (42) is supported and abutted against the bottom surface of the cylinder (21) located below the magnet device.

3. The valve position indicator magnet device according to claim 1, characterized in that: The outer portion of the signal indicating cover (5) is sleeve-fitted with a transparent cover (51).

4. The method for preparing a magnet device for a valve position indicator according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: Step S1: Preparation of magnetic ring assembly First, a non-magnetized magnet (12) is manufactured, then the non-magnetized magnet (12) and the plastic ring (11) are integrally injection-molded into the magnetic ring assembly (1) by an injection molding machine, and finally, the magnet (12) in the magnetic ring assembly (1) is magnetized; Step S2: Preparation of card assembly First, a cylinder (21) with the annular flange (211) at the end is integrally injection-molded by an injection molding machine, and the cylinder (21) is cut in half by a cutting machine; then, the rubber gasket (23) is cut and manufactured, and a screw (22) adapted thereto is processed and prepared for use; Step S3: Assembly of the magnet device First, the cylinder (21) split in half is axially inserted into the plastic ring (11) corresponding to the magnetic ring assembly (1) respectively; then, the two cylinders (21) with the magnetic ring assembly (1) inserted are respectively attached to the end faces of the rubber gasket (23), and the through hole (231) of the rubber gasket (23) is kept axially connected with the corresponding screw holes (213) on both sides thereof; finally, the screw rod (22) is screwed and locked with the corresponding screw holes (213) to form the magnet device.

5. The method for preparing a magnet device for a valve position indicator according to claim 4, characterized in that: In the step S1, the temperature of the magnetic ring assembly (1) is maintained at 100-110° C. during injection molding.

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