Polyurethane efficient sealing piston

Abstract

The utility model relates to the technical field of fluid mechanical sealing, in particular to a polyurethane efficient sealing piston which comprises a piston body. The annular sealing part is arranged on the peripheral surface of the piston body; the drainage groove is formed in the piston body; the liquid inlet is formed in the side surface of the piston body and communicates with the drainage groove; the inlet end of the liquid outlet channel communicates with the drainage groove, and the outlet end of the liquid outlet channel extends to the lower end face of the piston body; according to the dynamic pressure relief piston, the drainage groove is formed in the piston body and communicated with the liquid inlet and the liquid outlet channel, a leaked medium enters the drainage groove through the liquid inlet, the drainage groove gathers the medium to the inlet end of the liquid outlet channel, and the medium is discharged outwards through the liquid outlet channel, so that dynamic pressure relief is achieved; leakage media can rapidly enter the drainage groove through the liquid inlet and then are discharged out of the piston through the liquid outlet channel.

Description

Technical Field

[0001] This utility model relates to the field of fluid machinery sealing technology, and more specifically, to a polyurethane high-efficiency sealing piston. Background Technology

[0002] In hydraulic systems, pneumatic devices, and various fluid conveying equipment, the sealing piston is a key component, and its sealing performance directly affects the system's working efficiency and reliability.

[0003] Traditional sealed pistons typically employ a single sealing ring structure. Under prolonged high-pressure, high-speed, or particulate-containing operating environments, this ring is prone to wear, aging, or deformation, leading to media leakage. Leaked media accumulates between the piston and cylinder wall, creating additional pressure and further exacerbating seal failure, potentially causing equipment malfunction. Furthermore, existing piston structures lack effective leakage media drainage mechanisms. When leakage increases, it cannot be discharged promptly, causing a continuous rise in pressure. This not only reduces sealing performance but may also damage the piston and cylinder, increasing equipment maintenance costs and downtime.

[0004] Therefore, there is an urgent need for a high-efficiency polyurethane sealing piston to improve the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency polyurethane sealing piston. By incorporating a drainage groove inside the piston body, connected to an inlet and an outlet channel, when a media leak occurs, the leaked medium can quickly enter the drainage groove through the inlet and then be discharged outside the piston through the outlet channel, thus solving the problems mentioned in the background art.

[0006] Traditional sealed pistons typically use a single sealing ring structure. Under long-term high-pressure, high-speed or particulate impurity working environments, the sealing ring is prone to wear, aging or deformation, leading to media leakage.

[0007] To achieve the above objectives, this utility model provides a polyurethane high-efficiency sealing piston, including a piston body;

[0008] An annular sealing portion is disposed on the outer peripheral surface of the piston body;

[0009] A drainage channel is formed inside the piston body;

[0010] The liquid inlet is located on the side surface of the piston body and is connected to the drainage groove;

[0011] The liquid outlet channel is axially arranged through the piston body, with its inlet end connected to the drainage groove and its outlet end extending to the lower end face of the piston body.

[0012] The leaking medium enters the diversion tank through the inlet, and the diversion tank collects the medium to the inlet end of the outlet channel. The medium is then discharged outward through the outlet channel, achieving dynamic pressure relief.

[0013] In the above technical solution, when a medium leaks from the annular seal, the leaking medium first reaches the side surface of the piston body. At this time, the inlet located between the sealing groove and the annular seal quickly captures this leaking medium, causing it to enter the drainage groove inside the piston body. The drainage groove, as a radially extending guide channel, can quickly collect the leaking medium and guide it to the inlet end of the outlet channel. The outlet channel is axially arranged through the piston body, and the medium is discharged from the lower end face of the piston body through this channel, realizing dynamic pressure relief. When the pressure inside the drainage groove is higher than the external pressure of the piston, the one-way valve automatically opens to accelerate the discharge of the medium. When the pressure is balanced or the external pressure is higher, it automatically closes to prevent the backflow of external medium, thereby continuously ensuring the sealing performance of the piston and the stable operation of the system.

[0014] Based on this, when the leaked medium enters the drainage channel through the inlet and converges into the outlet channel, the one-way valve at the outlet plays a crucial regulatory role. When the pressure inside the drainage channel is higher than the external pressure of the piston, the one-way valve automatically opens under the pressure difference, allowing the medium accumulated in the drainage channel and outlet channel to be quickly discharged, releasing internal pressure in a timely manner and preventing seal failure due to excessive pressure. When the pressure inside the drainage channel decreases to balance with the external pressure, or when the external pressure is higher than the internal pressure, the one-way valve automatically closes, its sealing surface remaining coplanar with the lower end face of the piston body, forming a tight seal and effectively preventing the external medium from flowing back into the piston. Through the automatic opening and closing mechanism controlled by the pressure difference, precise regulation of the internal pressure of the piston is achieved, continuously ensuring the sealing reliability of the piston and the stable operation of the system.

[0015] In another technical solution, the annular sealing part is coaxially provided with a sealing groove, and each sealing groove is fitted with an elastic sealing ring. The liquid inlet is located on the side wall of the piston body between the sealing groove and the annular sealing part, which is used to capture the leaked medium between the sealing rings.

[0016] This technical solution utilizes an annular sealing section with an elastic sealing ring embedded in a coaxially arranged sealing groove. The sealing ring's elastic deformation tightly conforms to the cylinder wall where the piston moves, forming multiple lines of sealing to effectively prevent media leakage. The inlet is cleverly positioned on the piston body sidewall between the sealing groove and the annular sealing section. When the medium breaks through the initial barrier of the outer annular sealing section, or when a small leak occurs in the inner elastic sealing ring, the leaking medium is immediately captured by the inlet, rapidly entering the drainage groove inside the piston body and then discharged through the outlet channel.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This high-efficiency polyurethane sealing piston features a drainage groove inside the piston body, connected to the inlet and outlet channels. In the event of a leak, the leaking medium quickly enters the drainage groove through the inlet and is then discharged outside the piston via the outlet channel. This structural design effectively reduces the accumulation of leaking medium between the piston and cylinder wall, lowers the risk of seal failure due to pressure increases, and significantly improves the piston's sealing reliability.

[0019] A one-way valve installed at the outlet of the liquid outlet channel automatically opens or closes based on the pressure difference between the inside and outside. When the pressure inside the drainage channel is higher than the external pressure, the one-way valve automatically opens to release pressure, ensuring that the internal pressure of the piston is always within a safe range; when the internal and external pressures are balanced or the external pressure is higher than the internal pressure, the one-way valve closes to prevent backflow of the external medium. This automatic pressure regulation mechanism further enhances the sealing stability of the piston. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0021] Figure 2 This is a schematic diagram of the piston body structure in an embodiment;

[0022] Figure 3 This is a schematic diagram of the cut front view structure of the embodiment;

[0023] Figure 4 This is a schematic diagram of the overall cross-sectional structure of an embodiment.

[0024] The meanings of the labels in the diagram are as follows:

[0025] 100 Piston body; 110 Sealing groove; 120 Annular seal; 130 Drainage groove; 140 Liquid inlet; 150 Liquid outlet channel; 160 Check valve. Detailed Implementation

[0026] 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.

[0027] Traditional sealed pistons typically use a single sealing ring structure. Under long-term high-pressure, high-speed, or particulate-containing operating environments, the sealing ring is prone to wear, aging, or deformation, leading to media leakage. Please refer to [link to relevant documentation]. Figures 1-4 As shown, this embodiment provides a polyurethane high-efficiency sealing piston, including a piston body 100;

[0028] An annular sealing part 120 is disposed on the outer peripheral surface of the piston body 100;

[0029] The flow channel 130 is formed inside the piston body 100;

[0030] The liquid inlet 140 is located on the side surface of the piston body 100 and is connected to the drainage groove 130;

[0031] The liquid outlet channel 150 is axially arranged through the piston body 100, with its inlet end connected to the drainage groove 130 and its outlet end extending to the lower end face of the piston body 100.

[0032] The leaked medium enters the diversion channel 130 through the inlet 140. The diversion channel 130 collects the medium to the inlet end of the outlet channel 150. The medium is discharged outward through the outlet channel 150, realizing dynamic pressure relief.

[0033] In implementation, the annular seal 120 on the outer circumferential surface of the piston body 100 initially blocks the medium. When the annular seal 120 leaks under harsh working conditions such as long-term high pressure, high speed, or particulate impurities, the inlet 140 on the side surface of the piston body 100 quickly captures the leaking medium. After entering the inlet 140, the leaking medium flows into the drainage groove 130 inside the piston body 100. The drainage groove 130 collects the dispersed leaking medium and guides it to the inlet end of the outlet channel 150. Since the outlet channel 150 is axially arranged through the piston body 100 and extends to the lower end face of the piston body 100, the collected leaking medium is quickly discharged outside the piston through the outlet channel 150, thereby achieving dynamic pressure relief. This process avoids the accumulation of leaking medium between the piston and the cylinder, effectively reduces the continuous impact of pressure on the sealing structure, reduces the risk of seal failure due to pressure, wear, impurities, and other factors, and significantly improves the sealing reliability and working stability of the piston under complex working conditions.

[0034] See Figure 2 As shown, the elastic sealing ring is embedded in the sealing groove 110 and fits tightly against the inner surface of the cylinder wall when the piston and cylinder wall move relative to each other. When the piston operates under complex conditions such as high pressure, high speed, or containing particulate impurities, the elastic sealing ring can adaptively compensate for the gaps caused by wear and pressure changes, maintain close contact with the cylinder wall, and effectively prevent the medium from leaking through the gap between the piston and the cylinder wall.

[0035] Figure 3 In this design, the radially extending drainage channel 130 can quickly collect the dispersed leaking medium with the shortest path and least resistance. Due to its radial layout, it can efficiently connect with the inlet end of the outlet channel 150, allowing the leaking medium to be quickly guided into the outlet channel 150 that runs through the piston body 100 axially, avoiding pressure loss or local accumulation caused by the medium flowing around inside the piston.

[0036] See Figure 4 As shown, when the medium leaks through the gap between the annular sealing part 120 and the elastic sealing ring, the liquid inlet 140 located on the side wall of the piston body 100 between the sealing groove 110 and the annular sealing part 120 can accurately capture the leaked medium and guide it to quickly enter the drainage groove 130 inside the piston.

[0037] Additionally, see Figure 4 As shown, as the leaked medium continuously accumulates in the drainage channel 130, when the pressure inside the drainage channel 130 rises and exceeds the external pressure of the piston, the one-way valve 160 at the outlet end of the outlet channel 150 automatically opens under the action of the pressure difference, allowing the medium to be quickly discharged outside the piston through the outlet channel 150, thus achieving dynamic pressure relief. When the internal and external pressures are balanced or the external pressure is higher than the internal pressure, the one-way valve 160 automatically closes, and its sealing surface remains coplanar with the lower end face of the piston body 100, preventing backflow of the external medium and avoiding the one-way valve 160 structure from hindering the piston movement.

[0038] In this embodiment, a high-efficiency polyurethane sealing piston is used in which an elastic sealing ring is first embedded in the sealing groove 110 of the piston body 100. The elastic sealing ring, with its excellent elastic deformation capability, tightly conforms to the inner surface of the cylinder wall, effectively preventing media leakage through the gap between the piston and the cylinder wall. Under complex operating conditions such as high pressure, high speed, or the presence of particulate impurities, it can also adaptively compensate for gaps caused by wear and pressure changes, continuously maintaining the sealing effect. Simultaneously, the sealing groove 110 positions and protects the elastic sealing ring, reducing direct scouring and erosion by impurities and extending the service life of the sealing ring.

[0039] In the event of a media leak, the inlet 140 located on the side wall of the piston body 100 between the sealing groove 110 and the annular sealing part 120 can quickly capture the leaking media and guide it into the radially extending drainage groove 130 inside the piston. The drainage groove 130 quickly gathers the dispersed leaking media to the inlet end of the outlet channel 150 with the shortest path and least resistance. When the pressure inside the drainage groove 130 is higher than the external pressure of the piston, the one-way valve 160 at the outlet end of the outlet channel 150 automatically opens, and the media is discharged from the outside of the piston through the outlet channel 150 to achieve dynamic pressure relief; when the internal and external pressures are balanced or the external pressure is higher than the internal pressure, the one-way valve 160 automatically closes, and its sealing surface is coplanar with the lower end face of the piston body 100 to prevent the external media from flowing back and ensure that the piston maintains reliable sealing performance and stable operation under complex working conditions.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A polyurethane high-efficiency sealing piston, characterized in that: Includes piston body (100); An annular sealing part (120) is disposed on the outer peripheral surface of the piston body (100); A flow channel (130) is formed inside the piston body (100); The liquid inlet (140) is located on the side surface of the piston body (100) and communicates with the drainage groove (130); The liquid outlet channel (150) is axially arranged through the piston body (100), with its inlet end connected to the drainage groove (130) and its outlet end extending to the lower end face of the piston body (100). The leaking medium enters the diversion channel (130) through the inlet (140), and the diversion channel (130) collects the medium to the inlet end of the outlet channel (150). The medium is discharged outward through the outlet channel (150) to achieve dynamic pressure relief.

2. The polyurethane high-efficiency sealing piston according to claim 1, characterized in that: The flow channel (130) is a flow channel that extends radially along the piston body (100).

3. The polyurethane high-efficiency sealing piston according to claim 1, characterized in that: The outlet end of the liquid outlet channel (150) is equipped with a one-way valve (160).

4. The polyurethane high-efficiency sealing piston according to claim 3, characterized in that: The one-way valve (160) automatically opens to release pressure when the external pressure of the piston is lower than the internal pressure of the drainage groove (130), and when closed, its sealing surface is coplanar with the lower end surface of the piston body (100).

5. The polyurethane high-efficiency sealing piston according to claim 1, characterized in that: The annular sealing part (120) is coaxially provided with a sealing groove (110), and each sealing groove (110) is fitted with an elastic sealing ring.

6. The polyurethane high-efficiency sealing piston according to claim 1, characterized in that: The inlet (140) is located on the side wall of the piston body (100) between the sealing groove (110) and the annular sealing part (120) and is used to capture the leaked medium between the sealing rings.

Images