Seal and flow channel assembly

Abstract

The utility model discloses a sealing ring and flow channel subassembly relates to point gum valve sealing technical field, and sealing ring includes the sealing portion, follow -up portion and fixed portion that set gradually from inside to outside along the radial direction, and fixed portion fixed connection is in flow channel spare, and the outer peripheral wall of sealing portion is set in the striker, and sealing portion can move with the striker relative to flow channel spare to make follow -up portion produce elastic deformation.

Description

Technical Field

[0001] This utility model relates to the field of dispensing valve sealing technology, and in particular to a sealing ring and flow channel assembly. Background Technology

[0002] In dispensing valves, the seal between the ejector pin and the flow channel is crucial. Existing sealing rings are made of engineering plastics, and the seal relies on the mutual compression between the flow channel and the ejector pin. During the reciprocating motion of the ejector pin, friction between the ejector pin and the inner hole of the sealing ring causes wear on the sealing ring. At the same time, the ejector pin extends into the flow channel and comes into contact with the adhesive during the dispensing process. After prolonged operation, adhesive begins to adhere to the surface of the ejector pin, reducing its surface smoothness. During the reciprocating motion of the ejector pin, this further accelerates the wear of the sealing ring. Therefore, the existing sealing rings have a short service life, and the maintenance and replacement cycle is short, which leads to reduced production efficiency and high production costs. Utility Model Content

[0003] The main purpose of this invention is to provide a sealing ring and flow channel assembly, which aims to improve the sealing effect of the internal ejector pin and flow channel components of the dispensing valve.

[0004] To achieve the above objectives, the sealing ring proposed in this utility model includes a sealing part, a follower part, and a fixing part arranged sequentially from the inside to the outside along the radial direction. The fixing part is fixedly connected to the flow channel component, and the sealing part is sleeved on the outer peripheral wall of the firing pin. The sealing part can move with the firing pin relative to the flow channel component to cause the follower part to undergo elastic deformation.

[0005] In one embodiment, the follower portion has a folded structure along the radial direction of the sealing ring.

[0006] In one embodiment, the cross-section of the follower is S-shaped or inverted U-shaped.

[0007] In one embodiment, the portion where the follower part connects with the sealing part and the fixing part has a rounded corner transition.

[0008] In one embodiment, the fixing part has a first pressing surface and a second pressing surface formed on both sides along the axial direction, the first pressing surface is used to abut against the ejector pin guide sleeve, and the second pressing surface is used to abut against the flow channel component.

[0009] In one embodiment, both the first pressing surface and the second pressing surface are planar.

[0010] In one embodiment, the sealing portion has a tapered cross-section, and the thickness of the sealing portion gradually decreases in the direction away from the follower portion.

[0011] In one embodiment, the sealing ring is made of rubber.

[0012] This utility model also proposes a flow channel assembly, which includes a sealing ring, a flow channel component, a striker, and a striker guide sleeve. The striker guide sleeve is sleeved on the striker. The two sides of the sealing ring abut against the striker guide sleeve and the flow channel component respectively in the axial direction. The striker drives the follower to move up and down relative to the flow channel component.

[0013] This invention provides a sealing ring for sealing between a striker and a flow channel component. It is suitable for high-pressure injection equipment, fluid metering valves, and other devices requiring precise fluid flow control. The sealing ring ensures a leak-proof seal during the movement of the striker relative to the flow channel component. The sealing ring consists of three parts arranged radially in sequence: a sealing part, a following part, and a fixing part. The inner wall of the sealing part is tightly fitted to the outer peripheral wall of the striker, blocking fluid leakage channels through an interference fit. The structure of the sealing part can be adapted to the shape of the striker. The following part connects the sealing part and the fixing part. The following part employs a thin-walled elastic structure, compensating for the displacement of the sealing part caused by the movement of the striker through its own deformation, while maintaining the overall stability of the sealing ring. The following part must possess good fatigue resistance to withstand long-term use. The fixing part is fixed to the flow channel component through an interference fit. It provides a stable installation reference for the entire sealing ring, preventing displacement during striker movement. The structure of the fixing part must be adapted to the mounting groove on the flow channel component.

[0014] When the firing pin moves under the drive of the equipment, it drives the sealing part to move synchronously, and the follower part undergoes elastic deformation to compensate for the displacement of the sealing part. Through the coordinated action of the sealing part, the follower part, and the fixing part, the sealing problem during the movement of the firing pin is effectively solved. While ensuring sealing performance, the normal operation of the firing pin is not affected, significantly improving the operational reliability of the dispensing valve. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A cross-sectional view of the sealing ring provided by this utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the assembly structure of the middle sealing ring.

[0018] Explanation of icon numbers:

[0019] 100. Flow channel assembly; 10. Sealing ring; 1. Sealing part; 2. Follower part; 3. Fixing part; 20. Flow channel component; 30. Impact pin; 40. Impact pin guide sleeve.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] 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 scope of protection of the present utility model.

[0022] 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 specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] In dispensing valves, the seal between the ejector pin and the flow channel is crucial. Existing sealing rings are made of engineering plastics, and the seal relies on the mutual compression between the flow channel and the ejector pin. During the reciprocating motion of the ejector pin, friction between the ejector pin and the inner hole of the sealing ring causes wear on the sealing ring. At the same time, the ejector pin extends into the flow channel and comes into contact with the adhesive during the dispensing process. After prolonged operation, adhesive begins to adhere to the surface of the ejector pin, reducing its surface smoothness. During the reciprocating motion of the ejector pin, this further accelerates the wear of the sealing ring. Therefore, the existing sealing rings have a short service life, and the maintenance and replacement cycle is short, which leads to reduced production efficiency and high production costs.

[0025] To solve the above problems, please refer to... Figure 1 and Figure 2 This utility model proposes a sealing ring 10, which includes a sealing part 1, a follower part 2 and a fixing part 3 arranged in a radial direction from the inside to the outside. The fixing part 3 is fixedly connected to the flow channel 20, and the sealing part 1 is sleeved on the outer peripheral wall of the impact pin 30. The sealing part 1 can move with the impact pin 30 relative to the flow channel 20 so that the follower part 2 can undergo elastic deformation.

[0026] This invention provides a sealing ring 10 for sealing between a striker 30 and a flow channel component 20. It is suitable for high-pressure injection equipment, fluid metering valves, and other devices requiring precise fluid flow control. During the movement of the striker 30 relative to the flow channel component 20, it ensures a leak-proof seal between the two. The sealing ring 10 consists of three parts arranged radially in sequence: a sealing part 1, a follower part 2, and a fixing part 3. The inner wall of the sealing part 1 is tightly fitted to the outer peripheral wall of the striker 30, blocking fluid leakage channels through an interference fit. The structure of the sealing part 1 can be adapted to the shape of the striker 30. The follower part 2 connects the sealing part 1 and the fixing part 3. The follower part 2 adopts a thin-walled elastic structure, capable of compensating for the displacement of the sealing part 1 caused by the movement of the striker 30 through its own deformation, while maintaining the overall stability of the sealing ring 10. The follower part 2 must possess good fatigue resistance to withstand long-term use. The fixing part 3 is fixed to the flow channel component 20 by interference fit. It provides a stable installation reference for the entire sealing ring 10 and can prevent the sealing ring 10 from shifting during the movement of the impact pin 30. The structure of the fixing part 3 needs to be adapted to the mounting groove on the flow channel component 20.

[0027] When the ejector pin 30 moves under the drive of the equipment, it drives the sealing part 1 to move synchronously, and the follower part 2 undergoes elastic deformation to compensate for the displacement of the sealing part 1. Through the coordinated action of the sealing part 1, the follower part 2, and the fixing part 3, the sealing problem during the movement of the ejector pin 30 is effectively solved. While ensuring the sealing performance, the normal operation of the ejector pin 30 is not affected, significantly improving the operational reliability of the dispensing valve.

[0028] In an alternative embodiment, please refer to Figure 1 The follower part 2 has a folded structure along the radial direction of the sealing ring 10.

[0029] This type of sealing ring 10 is suitable for scenarios where the impact pin 30 moves with a large stroke, such as in equipment like injection valves, effectively improving the deformation capability and displacement compensation range of the follower part 2. The folded structure of the follower part 2 is multi-layered and wrinkled. Operators can design it as a single-fold or multi-fold form according to the travel stroke of the impact pin 30 and the overall size of the sealing ring 10. The advantages of this folded structure are mainly reflected in two aspects: firstly, it increases the deformation amplitude of the follower part 2, and the deformation process is smoother, reducing stress concentration inside the follower part 2; secondly, it expands the displacement compensation range of the follower part 2, preventing the sealing part 1 and the fixed part 3 from being damaged by pulling or squeezing due to excessive displacement. The follower part 2 combines elasticity and structural strength, and the folded areas require a smooth transition. The inner side of the follower part 2 is fixedly connected to the sealing part 1, and the outer side is fixedly connected to the fixed part 3. The connection between the two is preferably made using an integral molding process to ensure connection strength. When the impact pin 30 moves the sealing part 1, the folded layers of the follower part 2 will unfold or contract accordingly, thereby compensating for the displacement of the sealing part 1. This design can adapt to the working conditions of the 30-stroke movement of the firing pin, reduce the stress concentration phenomenon of the follower part 2, and extend the service life of the sealing ring 10.

[0030] In an optional embodiment, the cross-section of the follower 2 is S-shaped or inverted U-shaped.

[0031] This structure helps to fix the deformation path of the follower part 2, making the deformation process more stable. The follower part 2 with an S-shaped cross-section is symmetrically curved. During deformation, the S-shaped follower part 2 will deform along the preset bending path, which can ensure the stability of the sealing part 1 when it moves with the impact pin 30. The follower part 2 with an inverted U-shaped cross-section is curved with the opening facing downward. The inverted U-shaped structure has better compression resistance. The follower part 2, sealing part 1, and fixing part 3 are all connected by an integral molding process to ensure the sealing performance and structural strength of the connection of each component. When the impact pin 30 drives the sealing part 1 to move, the upper and lower curved sections of the S-shaped cross-section follower part 2 will expand or contract synchronously, and the curved section at the opening of the inverted U-shaped cross-section follower part 2 will deform accordingly. This design can ensure the sealing stability of the sealing ring 10 during operation, and at the same time expand the adaptability range of the sealing ring 10 to different working conditions. In this embodiment, the cross-sectional shape of the follower part 2 is a flat S-shaped structure. In other embodiments, the specific shape can be selected according to actual needs.

[0032] In an alternative embodiment, please refer to Figure 1 The part where the follower part 2 connects with the sealing part 1 and the fixing part 3 is provided with a rounded corner transition.

[0033] The rounded corners at both ends of the follower part 2 effectively reduce stress concentration at the connection point, improving the structural strength and service life of the sealing ring 10. The radius of the rounded corner is 0.5-1 times the thickness of the connection point. A smooth rounded corner transition can be achieved through a molding process, ensuring no obvious seams or steps between the rounded corner and the follower part 2, sealing part 1, or fixing part 3. The main function of the rounded corner transition is to disperse the tensile or compressive stress generated during the deformation of the follower part 2, preventing stress concentration at the connection point due to right-angle or acute-angle structures, thereby preventing cracks or breakage. The rounded corner transition forms an integral structure with the follower part 2, sealing part 1, and fixing part 3; when the follower part 2 deforms as it moves with the sealing part 1, the stress is evenly distributed along the arc surface of the rounded corner transition, preventing stress peaks at the connection point. This extends the service life of the sealing ring 10 and reduces maintenance costs for the dispensing valve due to damage to the sealing ring 10.

[0034] In an optional embodiment, the fixing part 3 has a first pressing surface and a second pressing surface formed on both sides along the axial direction, the first pressing surface is used to abut against the ejector guide sleeve 40, and the second pressing surface is used to abut against the flow channel member 20.

[0035] The first clamping surface is used to tightly fit with the end face of the firing pin guide sleeve 40, and the second clamping surface is used to tightly fit with the bottom surface of the mounting groove of the flow channel component 20. The size of the second clamping surface matches the size of the bottom surface of the mounting groove of the flow channel component 20. The outer peripheral wall of the fixing part 3 is engaged in the mounting groove of the flow channel component 20. The first and second clamping surfaces, through their cooperation with the firing pin guide sleeve 40 and the flow channel component 20, form a bidirectional axial clamping force on the fixing part 3. At the same time, the tight fit between the two and the mating parts also forms an auxiliary sealing structure. The firing pin guide sleeve 40 presses against the first clamping surface, while the flow channel component 20 provides support to the second clamping surface, thereby achieving axial fixation of the fixing part 3. Meanwhile, the auxiliary sealing structure between the first clamping surface and the firing pin guide sleeve 40, and between the second clamping surface and the flow channel component 20, can prevent fluid leakage from these gaps and enhance the sealing reliability of the sealing ring 10.

[0036] Furthermore, both the first and second pressing surfaces are planar. This ensures full contact between the pressing surfaces and the mating components, thereby improving the installation stability of the fixing part 3 and the sealing effect of the sealing ring 10.

[0037] The planar structure is easier to manufacture, allowing workers to easily ensure the flatness and surface roughness requirements of the first and second pressing surfaces using conventional processing techniques. This avoids uneven fit that can occur with non-planar structures, thus preventing the fixing part 3 from loosening or fluid from leaking through the gaps. During installation, the planar first and second pressing surfaces ensure that the pressure applied by the impact pin guide sleeve 40 and the flow channel component 20 is evenly transmitted to the fixing part 3, ensuring axial force balance and stable sealing performance of the auxiliary sealing structure. This planar design simplifies the manufacturing process of the sealing ring 10, reduces production costs, and ensures that the sealing ring 10 can reliably perform its installation, fixing, and sealing functions in most industrial fluid control equipment, demonstrating strong versatility.

[0038] In an alternative embodiment, please refer to Figure 1 The sealing part 1 has a tapered cross-section, and the thickness of the sealing part 1 gradually decreases in the direction away from the follower part 2.

[0039] The conical sealing part 1 allows its inner wall to exert a gradual pressure on the outer peripheral wall of the impact pin 30. The end of the sealing part 1 furthest from the follower part 2 is thinner, resulting in stronger elastic deformation capability. When mating with the impact pin 30, this part can better adapt to any minor dimensional deviations that may exist on the outer peripheral wall of the impact pin 30, thereby enhancing the sealing effect of the sealing part 1. The conical end of the sealing part 1 is fitted onto the outer peripheral wall of the impact pin 30. When the impact pin 30 moves, the conical structure of the sealing part 1 maintains a tight fit with the outer peripheral wall of the impact pin 30 through its own elastic deformation. This gradual thickness design significantly improves the sealing reliability of the sealing ring 10, and is especially suitable for working conditions with large fluid pressure fluctuations.

[0040] In an optional embodiment, the sealing ring 10 is made of rubber. The rubber sealing ring 10 is suitable for most fluid sealing scenarios. Rubber material possesses good elasticity, wear resistance, and corrosion resistance, making it compatible with various types of fluids such as water, oil, and chemical reagents. The specific type of rubber is selected based on the type of fluid being handled: nitrile rubber is typically used when sealing oily fluids; fluororubber is preferred when sealing highly corrosive or high-temperature fluids; and silicone rubber can be used in fields with high cleanliness requirements, such as food and pharmaceuticals. Rubber material has good plasticity and is easily processed into the complex structures required for the sealing part 1, the following part 2, and the fixing part 3, meeting the functional requirements of each component. Vulcanization can be used in the structural design, resulting in low batch costs and improving the lifespan of the sealing ring 10 while reducing production costs. The elasticity of the rubber material ensures that the sealing part 1 and the outer peripheral wall of the impact pin 30 achieve an interference fit, while also ensuring that the follower part 2 generates effective elastic deformation to compensate for displacement. Its wear resistance and corrosion resistance can extend the service life of the sealing ring 10 and reduce the risk of equipment failure due to damage to the sealing ring 10.

[0041] This utility model also proposes a flow channel assembly 100, which includes a sealing ring 10, a flow channel component 20, a striker 30, and a striker guide sleeve 40. The striker guide sleeve 40 is sleeved on the striker 30. The two axial sides of the sealing ring 10 abut against the striker guide sleeve 40 and the flow channel component 20, respectively. The striker 30 drives the follower to move up and down relative to the flow channel component 20. The specific structure of the sealing ring 10 is as described in the above embodiments. Since this flow channel assembly 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. For reference, please refer to... Figure 1 and Figure 2 The flow channel 20 has a fluid channel inside for conveying fluid; the impact pin 30 can move within the flow channel 20, controlling the flow of fluid by blocking or opening the fluid channel; the impact pin guide sleeve 40 is fitted around the outer periphery of the impact pin 30 to guide the movement direction of the impact pin 30 and ensure the coaxiality of the movement of the impact pin 30; the sealing ring 10 is installed between the impact pin 30 and the flow channel 20 to achieve a seal between the two. During assembly, the impact pin guide sleeve 40 is first fitted onto the impact pin 30, and then the sealing ring 10 is installed at a preset position on the flow channel 20, so that the two axial sides of the sealing ring 10 abut against the impact pin guide sleeve 40 and the flow channel 20 respectively. At the same time, the sealing part 1 of the sealing ring 10 is fitted onto the outer peripheral wall of the impact pin 30, and the fixing part 3 is fixed to the flow channel 20. When the dispensing valve is in operation, the impact pin 30 drives the sealing part 1 of the sealing ring 10 to move up and down relative to the flow channel component 20. The follower part 2 then undergoes elastic deformation to compensate for the displacement of the sealing part 1. The impact pin guide sleeve 40 ensures the coaxiality of the impact pin 30 during its movement, while the sealing ring 10 maintains the sealing state between the impact pin 30 and the flow channel component 20. Through the coordinated work of its components, the entire flow channel assembly 100 achieves precise control and reliable sealing of the fluid, effectively improving the overall performance of the dispensing valve.

[0042] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A sealing ring for sealing between a firing pin and a flow channel component, characterized in that, The sealing ring includes a sealing part, a follower part, and a fixing part arranged in a radial direction from the inside to the outside. The fixing part is fixedly connected to the flow channel component, and the sealing part is sleeved on the outer peripheral wall of the firing pin. The sealing part can move with the firing pin relative to the flow channel component to cause the follower part to undergo elastic deformation.

2. The sealing ring as described in claim 1, characterized in that, The follower part has a folded structure along the radial direction of the sealing ring.

3. The sealing ring as described in claim 2, characterized in that, The cross-section of the follower part is S-shaped or inverted U-shaped.

4. The sealing ring as described in claim 2, characterized in that, The part where the follower part connects with the sealing part and the fixing part has a rounded corner transition.

5. The sealing ring according to any one of claims 1 to 4, characterized in that, The fixing part has a first pressing surface and a second pressing surface formed on both sides along the axial direction. The first pressing surface is used to abut against the ejector pin guide sleeve, and the second pressing surface is used to abut against the flow channel component.

6. The sealing ring as described in claim 5, characterized in that, Both the first pressing surface and the second pressing surface are planar.

7. The sealing ring as described in claim 5, characterized in that, The sealing part has a tapered cross-section, and the thickness of the sealing part gradually decreases in the direction away from the follower part.

8. The sealing ring as described in claim 5, characterized in that, The sealing ring is made of rubber.

9. A flow channel assembly, characterized in that, The device includes a sealing ring as described in any one of claims 1 to 8, a flow channel component, a striker, and a striker guide sleeve, wherein the striker guide sleeve is sleeved on the striker, and the two axial sides of the sealing ring respectively abut against the striker guide sleeve and the flow channel component, and the striker drives the follower to move up and down relative to the flow channel component.

Images