A piston and pilot light concentric quick plug structure for a valve body

Abstract

This utility model discloses a concentric quick-connect structure for a piston and indicator light in a valve body, including a piston, piston rod, and indicator light arranged along the same axis. One end of the piston rod has an axial blind hole, which is formed by a cylindrical guide section, a radially fitting recess at the bottom, and an insertion opening on the side. The end of the indicator light's connecting post has a radially protruding fitting boss. After the connecting post and fitting boss are inserted into the cylindrical guide section and the radially fitting recess, the indicator light and piston rod are connected and kept concentric. This structure achieves the concentric arrangement of the piston, piston rod, and indicator light, ensuring coaxiality during operation and reducing wear and malfunctions caused by eccentricity. The quick-connect connection simplifies the assembly process, improves assembly efficiency, facilitates later maintenance and replacement, and meets the requirements of rapid manual assembly and disassembly, high coaxiality maintenance, and compact structure.

Description

Technical Field

[0001] This utility model relates to a concentric quick-connect structure for a piston and indicator light for a valve body, which is particularly suitable for automatic valves that require real-time observation of the piston position from the outside of the valve body, while also requiring quick assembly and disassembly and high-precision coaxial positioning. Background Technology

[0002] In pneumatically, hydraulically, or electromagnetically driven automatic valves, a visual indicator light (indicator) is typically installed on the outer end of the piston rod to visually display the position of the valve core (piston) to the operator. Existing technologies generally employ three main implementation methods, but all exhibit significant shortcomings:

[0003] 1. Threaded locking indicator light

[0004] 1. The traditional method involves machining external threads on the end of the piston rod and then screwing on a plastic or metal indicator cap with internal threads. While simple, this method has the following problems:

[0005] 2. Low assembly efficiency: It requires multiple rotations to lock, and is difficult to operate at heights or in confined spaces;

[0006] 3. Coaxiality is difficult to guarantee: There is backlash in the threaded fit, and after long-term use, the indicator cap is prone to eccentricity and wobbling, causing visual errors;

[0007] 4. Easy to loosen: Under vibration conditions, the threads are easy to loosen, causing the indicator cap to fall off or even fall into the pipeline.

[0008] II. Interference-fit Indicator Light

[0009] 1. Some manufacturers use an interference fit to press the indicator cap directly into the blind hole at the end of the piston rod. Although this eliminates the need for threads, however:

[0010] 2. Specialized tools are required for both assembly and disassembly, making rapid replacement difficult to achieve on-site during maintenance;

[0011] 3. Repeated disassembly and reassembly reduce the interference fit, causing a rapid decline in connection reliability;

[0012] 4. Interference stress is concentrated on the plastic indicator cap, which can easily cause cracks or breakage.

[0013] III. Lateral fixing with screws / pins

[0014] 1. Another solution is to drill a hole in the side of the piston rod and fix the indicator cap with a set screw or a transverse pin. This solution also has significant drawbacks:

[0015] 2. Exposed screws or pins are susceptible to corrosion and may loosen;

[0016] 3. Tools are still required during installation, making it impossible to achieve true "quick disassembly by hand".

[0017] Technical problems that existing technologies have failed to solve:

[0018] In summary, existing technologies do not yet simultaneously meet the following four requirements:

[0019] a) Quick manual installation and removal: Indicator lights can be installed and removed without tools;

[0020] b) High coaxiality retention: After long-term use and frequent disassembly and assembly, the indicator light remains precisely concentric with the piston rod;

[0021] c) Compact structure: It does not increase the overall size of the valve body and is suitable for space-constrained applications.

[0022] Therefore, it is necessary to propose a completely new "concentric connection structure of piston and indicator light in valve body" to overcome the above-mentioned defects of the existing technology. Utility Model Content

[0023] To address the shortcomings in the prior art, this utility model provides a concentric quick-connect structure for a piston and indicator light in a valve body.

[0024] The technical solution adopted by this utility model is: a concentric quick-connect structure for a piston and indicator light for a valve body, including a piston, a piston rod and an indicator light arranged along the same axis;

[0025] One end of the piston rod is provided with an axial blind hole, which is composed of a cylindrical guide section and a radial fitting recess located at its bottom. An insertion opening is provided on the side of the blind hole.

[0026] The indicator light has an axially extending connecting post, and the end of the connecting post is provided with a radially protruding fitting boss;

[0027] The connecting post and the fitting boss are inserted into the cylindrical guide section and the radial fitting recess to connect the indicator light to the piston rod and keep the two concentric.

[0028] Furthermore, the outer peripheral walls of the connecting post and the fitting boss smoothly transition with the outer peripheral wall of the piston rod at the connection point.

[0029] Furthermore, the connecting column and the fitting boss are provided with planar first limiting surfaces on both sides, and the cylindrical guide section and the radial fitting recess are provided with second limiting surfaces that fit with the first limiting surfaces to prevent the indicator light from circumferentially shaking relative to the piston rod.

[0030] Furthermore, the outer ring of the plug is characterized by having a sealing ring groove.

[0031] The beneficial effects of this utility model are:

[0032] 1. Convenient for manual disassembly and assembly: By setting blind holes with embedded openings on the piston rod, the connecting post and the mating boss of the indicator light can be mated with the blind hole, and the two are concentric. The connecting post and the mating boss can be pressed into the blind hole by hand, and they can also be pried out of the blind hole by hand without any tools, which improves the efficiency and convenience of disassembly and assembly.

[0033] 2. The connecting column and fitting boss are hidden in the blind hole, and the outer peripheral wall is smoothly transitioned. The outer diameter of the indicator light is flush with the outer diameter of the piston rod, which does not take up extra space. It can directly replace the existing thread / interference / pin structure without changing the overall size of the valve.

[0034] In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of this utility model.

[0037] Figure 2 This is an exploded view of the present invention.

[0038] Figure 3 This is an exploded view of the present invention from another perspective.

[0039] Figure 1-3 In the middle: 1. Piston; 2. Piston rod; 3. Indicator light; 4. Cylindrical guide section; 5. Radial fitting recess; 6. Embedding opening; 7. Connecting column; 8. Fitting boss; 9. First limiting surface; 10. Second limiting surface; 11. Sealing ring groove. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] This utility model provides a concentric quick-connect structure for a piston and indicator light in a valve body.

[0043] In this embodiment, refer to Figure 1-3 The concentric quick-connect structure for the piston and indicator light of the valve body includes a piston 1, a piston rod 2 and an indicator light 3 arranged along the same axis;

[0044] One end of the piston rod 2 is provided with an axial blind hole, which is composed of a cylindrical guide section 4 and a radial fitting recess 5 located at its bottom. An insertion opening 6 is provided on the side of the blind hole.

[0045] The indicator light has an axially extending connecting post 7, and the end of the connecting post 7 is provided with a radially protruding fitting boss 8;

[0046] The connecting post and the fitting boss are inserted into the cylindrical guide section and the radial fitting recess to connect the indicator light to the piston rod and keep the two concentric.

[0047] In the above technical solution, by inserting the connecting post and the fitting boss of the indicator light into the cylindrical guide section and the radial fitting recess of the piston rod respectively, and utilizing the cooperation between the cylindrical guide section and the connecting post, and the radial fitting recess and the fitting boss, the indicator light and the piston rod are positioned on the same axis, achieving quick connection and maintaining concentricity. This achieves the concentric arrangement of the piston, piston rod, and indicator light, ensuring coaxiality during structural operation and reducing wear and malfunctions caused by eccentricity. Simultaneously, the quick-connect structure simplifies the assembly process, improves assembly efficiency, and facilitates later maintenance and replacement.

[0048] Specifically, the outer peripheral walls of the connecting post and the fitting boss smoothly transition with the outer peripheral wall of the piston rod at the connection point.

[0049] In this embodiment, the outer peripheral walls of the connecting column and the fitting boss are designed to smoothly transition with the outer peripheral wall of the piston rod at the connection point, eliminating any steps or protrusions at the connection. This results in a smooth transition of the outer peripheral walls, with the indicator light's outer diameter flush with the piston rod's outer diameter, without occupying extra space. It can directly replace existing threaded / interference / pin structures without altering the overall valve dimensions.

[0050] Specifically, the connecting column and the fitting boss are provided with planar first limiting surfaces 9 on both sides, and the cylindrical guide section and the radial fitting recess are provided with second limiting surfaces 10 that fit with the first limiting surfaces 9, so as to prevent the indicator light from circumferentially shaking relative to the piston rod.

[0051] In this embodiment, a planar first limiting surface is provided on both sides of the connecting column and the fitting boss, and a second limiting surface is provided on the cylindrical guide section and the radial fitting recess. When the two are engaged, the first limiting surface and the second limiting surface fit tightly together to form a circumferential limiting structure, which restricts the circumferential rotational freedom of the indicator light relative to the piston rod, reduces circumferential sway, and improves the reliability and service life of the structure.

[0052] Specifically, the feature is that the outer ring of the plug is provided with a sealing ring groove 11.

[0053] In this embodiment, a sealing ring groove is provided on the outer ring of the piston. The sealing ring groove can be used to install a sealing ring. The sealing ring is in close contact with the inner wall of the valve body to form a sealing structure.

[0054] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A concentric quick-connect structure for a piston and indicator light in a valve body, characterized in that... include: Pistons, piston rods, and indicator lights arranged along the same axis; One end of the piston rod is provided with an axial blind hole, which is composed of a cylindrical guide section and a radial fitting recess located at its bottom. An insertion opening is provided on the side of the blind hole. The indicator light has an axially extending connecting post, and the end of the connecting post is provided with a radially protruding fitting boss; The connecting post and the fitting boss are inserted into the cylindrical guide section and the radial fitting recess to connect the indicator light to the piston rod and keep the two concentric.

2. The concentric quick-connect structure for the piston and indicator light of the valve body according to claim 1, characterized in that: The outer peripheral walls of the connecting column and the fitting boss smoothly transition with the outer peripheral wall of the piston rod at the connection point.

3. The concentric quick-connect structure for the piston and indicator light of the valve body according to claim 1, characterized in that: The connecting column and the fitting boss are provided with planar first limiting surfaces on both sides, and the cylindrical guide section and the radial fitting recess are provided with second limiting surfaces that fit with the first limiting surfaces to prevent the indicator light from circumferentially shaking relative to the piston rod.

4. The concentric quick-connect structure for the piston and indicator light of the valve body according to claim 1, characterized in that: The piston outer ring is provided with a sealing ring groove.

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