Pressure retaining valve

Abstract

The pressure retaining valve is characterized in that a valve seat is arranged in a valve body, and a sealing groove is formed in the outer wall of the valve seat; a plurality of clamping blocks are arranged at the bottom end of the valve seat in the circumferential direction, and clamping grooves matched with the clamping blocks are formed in the valve body. The outer diameter of the clamping block is the same as that of the top end of the valve seat when the valve seat is not installed, and the outer diameter of the clamping block is larger than that of the top end of the valve seat when the valve seat is installed. Furthermore, the utility model further discloses a pressure retaining valve, a fillet step is arranged on the outer side wall of the valve seat in the circumferential direction, a fillet is arranged at the turning position of the step, a right-angle step matched with the fillet step is arranged on the inner wall of the valve body, and the outer diameter of the bottom end of the fillet step is the same as the outer diameter of the top end of the valve seat when the valve seat is not installed. The outer diameter of the bottom end of the fillet step is larger than that of the top end of the valve seat when the valve seat is installed. During installation, riveting equipment is utilized, and a material extrusion filling mode is adopted for fixing and sealing, so that the number of parts is reduced, the cost is reduced, and the product reliability is improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a pressure maintaining valve. Background Art

[0002] Existing pressure-maintaining valves, especially automobile shock absorber pressure-maintaining valves, are usually sealed with sealing rings or rubber parts, or fixed with threads. Their internal structures are complex, installation is inconvenient, and reliability is low.

[0003] Chinese Patent Publication No. CN212960034U, Publication Date April 13, 2021. The utility model is titled "A Pressure-Retaining Valve with a Separate Valve Body and Valve Core Structure." The application discloses a pressure-retaining valve with a separate valve body and valve core structure, comprising a valve body and a valve core. The inner cavity of the valve body is provided with an internal threaded section, the outer wall of the valve core is provided with an external threaded section that matches the internal threaded section, and the valve core is spirally assembled within the valve body. The middle and lower portion of the inner cavity of the valve body has an inverted truncated cone-shaped conical section, and the valve core is provided with a valve core rubber gasket that cooperates with the conical section for sealing. The valve core is equipped with a core rod and a valve core spring sleeved on the core rod for resetting the core rod. The valve core and the valve body in this application are connected and sealed using threads and rubber parts, resulting in a complex structure and poor reliability. Utility Model Content

[0004] The purpose of the utility model is to address the deficiencies of the existing technology and provide a pressure-maintaining valve, which sets a riveted structure between the valve seat and the valve body, and directly adopts the method of material extrusion and filling for fixation and sealing, thereby achieving the advantages of reducing the number of parts, good sealing effect, easy installation, simple structure and high reliability.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a pressure-maintaining valve having a valve seat provided in the valve body and a sealing groove provided on the outer wall of the valve seat; a plurality of clamping blocks are provided along the circumferential direction at the bottom end of the valve seat, and a clamping groove is provided on the valve body to match the clamping blocks; the outer diameter of the clamping blocks when the valve seat is not installed is the same as the outer diameter of the top end of the valve seat, and the outer diameter of the clamping blocks when the valve seat is installed is larger than the outer diameter of the top end of the valve seat. During installation, the present invention utilizes riveting equipment to press the clamping blocks into the clamping grooves to achieve fixation and sealing. The direct use of a material extrusion filling and sealing structure for fixation and sealing reduces the number of components, significantly reduces costs, and improves product reliability.

[0006] Preferably, the cross section of the clamping block is trapezoidal, and the cross section of the clamping groove is rectangular. The clamping block of the valve seat is extruded and filled into the clamping groove of the valve seat to form a fixing and sealing effect.

[0007] Preferably, the plurality of clamping blocks are symmetrical along the center axis of the valve seat, ensuring that the valve seat is evenly stressed during operation and firmly mounted in the valve body, thereby improving the stability and reliability of the valve.

[0008] Preferably, the outer diameter of the top of the valve seat is smaller than the inner diameter of the valve seat installation portion in the valve body, so that the valve seat can be installed in the valve body without damaging the valve body, and then the clamping block is squeezed into the clamping groove using a riveting device.

[0009] Preferably, a valve core is provided above the valve seat, a valve core inner hole is provided at one end of the valve core, and a spring is provided in the valve core inner hole. The valve stem structure is eliminated, and the valve core inner hole is used to guide the spring, thereby increasing the flow channel area.

[0010] Preferably, a conical inclined surface is provided on the inner side of the valve seat, which is clamped on the inclined surface of the frustum-shaped conical surface of the valve core. This matching mode improves the sealing effect and uniform force transmission between the valve seat and the valve core, ensuring the reliability of the valve.

[0011] Preferably, one end of the spring is connected to the bottom end of the valve core, and the other end is connected to the mounting platform at the exhaust port of the valve body, so that the force of the valve core can be evenly transmitted to the spring, thereby improving the response speed and adjustment accuracy of the valve.

[0012] Preferably, the valve seat is provided with a sealing groove along the circumferential direction above the clamping block, and a sealing ring is provided in the sealing groove, which further enhances the sealing performance of the valve and ensures stable operation under high pressure environment.

[0013] A pressure-maintaining valve employs the aforementioned valve core. The outer wall of the valve seat is provided with a circumferential step, with a rounded corner at the corner. The valve body is provided with a right-angled step that mates with the rounded step. When the valve seat is not installed, the outer diameter of the bottom end of the rounded step is the same as the outer diameter of the top end of the valve seat. When the valve seat is installed, the outer diameter of the bottom end of the rounded step is larger than the outer diameter of the top end of the valve seat. When the valve seat is pressed into the valve body, the material extruded from the valve body fills the inner corner of the valve seat, providing a secure and sealing effect, further strengthening the connection between the valve seat and the valve body.

[0014] Beneficial effects of the utility model: The utility model sets a riveted structure between the valve seat and the valve body, and directly adopts the method of material extrusion and filling for fixing and sealing, which reduces the number of parts, greatly reduces costs, and improves product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view and a cross-sectional view along the AA direction of Example 1 of the present invention.

[0016] Figure 2 for Figure 1 Magnified view at X.

[0017] Figure 3 This is a schematic diagram of the card block structure of Example 1 of the present utility model.

[0018] Figure 4 It is a front view and a cross-sectional view along the BB direction of Example 2 of the present invention.

[0019] Figure 5 for Figure 4 Enlarged view at Y.

[0020] Figure markings: 1: valve body; 1.1: mounting platform; 1.2: first cavity; 1.3: second cavity; 1.4: slot; 1.5: right-angle step; 1.6: exhaust port; 2: valve core; 2.1: inner hole of valve core; 2.2: frustoconical cone surface; 2.3: U-shaped groove; 3: spring; 4: valve seat; 4.1: sealing groove; 4.2: block; 4.3: rounded step; 5: sealing ring; 6: O-ring. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific implementations.

[0022] Example 1.

[0023] like Figure 1 As shown, the pressure-maintaining valve of the present invention consists of several key components, including a valve body 1, a valve core 2, a valve seat 4, a spring 3, a sealing ring 5, and an O-ring 6. The valve body 1 is the primary structural component of the pressure-maintaining valve, supporting the valve core 2 and valve seat 4. To ensure strength and corrosion resistance under high-pressure environments, the valve body 1 can be made of aluminum or copper. The valve core 2, valve seat 4, and spring 3 are housed within the valve body 1. The valve body 1 is cylindrical in shape, with exhaust ports at both ends. One of the exhaust ports, exhaust port 1.6, is smaller in diameter than the other. In the one-way sealing state, the pressure-maintaining valve is leak-proof. At the bottom end of exhaust port 1.6, a mounting platform 1.1 is located. This mounting platform 1.1 is a flat area extending radially outward from the center of the valve body 1 and is specifically designed to accommodate one end of the spring 3. The mounting platform 1.1 not only secures the spring 3 but also effectively transmits the force exerted on the valve body 1 to the spring 3, thereby ensuring proper valve operation. In addition, the mounting platform 1.1 has a limit adjustment function. It can limit the opening of the valve core 2 and the valve seat 4 according to the different flow requirements of the pressure-maintaining valve by adjusting the distance between the plane 1.1 and the end face of the valve seat. The inner cavity of the valve body 1 is composed of cylindrical cavities of different diameters. These cavities are designed to optimize the flow path of the fluid and reduce flow resistance. In the middle of the valve core 2, the valve body 1 is provided with a second cavity 1.3. In addition, two cavities with gradually increasing inner diameters are provided between the exhaust port 1.6 and the second cavity 1.3. This design leaves sufficient space for the installation of the spring 3 and the valve core 2. Below the second cavity 1.3, there is also a cavity with a diameter smaller than the second cavity 1.3. This design provides the necessary space for the installation of the valve seat 4, allowing the valve seat 4 to be firmly fixed in the valve body 1, ensuring the sealing performance and operational reliability of the valve.

[0024] The valve core 2 is a critical component of the pressure-maintaining valve, playing a key role in directly participating in and controlling fluid flow. The valve core 2 is made of metal or plastic injection molding. These materials not only offer excellent mechanical properties but are also adaptable to the chemical properties of various fluid media, ensuring the stability and reliability of the valve core 2 over long-term use. A first cavity 1.2 is defined between the top of the valve core 2 and the bottom end of the exhaust port of the valve seat 4. This design not only creates a buffer zone between the valve core 2 and the valve seat 4, increasing adjustment space, but also effectively reduces direct contact between the valve core 2 and the valve seat 4, thereby reducing wear and extending the overall service life of the valve. Furthermore, the design of the first cavity 1.2 plays a crucial role in the opening and closing of the valve. It provides a smoother transition, avoids shock caused by sudden pressure fluctuations, and reserves the necessary space for the expansion and contraction of the spring 3, ensuring smooth and reliable valve operation. A valve core inner hole 2.1 is defined at one end of the valve core 2. This inner hole connects to the first cavity 1.2, forming a continuous passage. The spring 3 is positioned within the valve core inner hole 2.1. The valve core inner bore 2.1 not only provides space for the fluid flow, but also for the installation and operation of the spring 3. By eliminating the valve stem structure and directly using the valve core inner bore 2.1 to guide the spring 3, the flow channel area is increased, meeting the requirements of a high-flow, pressure-maintaining valve. The size and shape of the valve inner bore also take into account the installation and movement of the spring 3, ensuring that the spring 3 can freely expand and contract within the inner bore without unnecessary obstruction. This design eliminates the complexity and limitations of traditional valve stem structures, simplifies the valve structure, reduces manufacturing costs, and reduces potential failure points, improving valve reliability and ease of maintenance. The bottom end of the valve core 2 features a frustoconical tapered surface 2.2. The inclined surface of this frustoconical surface 2.2 is provided with a U-shaped groove 2.3, located in the lower-middle portion of the inclined surface. An O-ring 6 is installed within this groove 2.3. This structure enhances the valve's sealing performance, ensuring a tighter fit between the valve seat 4 and the valve core 2, improving the sealing effect and ensuring a good seal even under high-pressure conditions. The angle of the conical slope has been optimized to ensure good sealing performance under different pressures, which is conducive to the uniform transmission of force and ensures the stable operation of the valve. The material selection of the sealing ring 5 is crucial. It must have good wear resistance and corrosion resistance to meet the requirements of different fluid media. The installation position of the O-ring 6 has been precisely calculated to ensure that a good sealing effect can be formed when the valve is closed to prevent fluid leakage. The second cavity 1.3 is arranged in the upper middle part of the truncated cone surface 2.2, the bottom surface is located above the U-shaped groove 2.3, and the top surface is located in the upper middle part of the valve core 2. The position setting ensures the sealing of the valve body 1.

[0025] Spring 3 is a crucial component of the pressure-maintaining valve, responsible for providing the return force to the valve core 2. One end of spring 3 is connected to the bottom of the valve core 2, and the other end is connected to the mounting base 1.1 of the valve body 1. This connection ensures stable transmission of spring 3's force and enables the valve core 2 to quickly respond to changes in system pressure, thereby precisely controlling fluid flow. Spring 3 passes through the first cavity 1.2 and connects to the mounting base 1.1, allowing it to freely compress or expand within the valve core's inner bore 2.1 and the first cavity 1.2. This design ensures uniform force transmission within the valve core's inner bore 2.1 and within the first cavity 1.2, ensuring smooth valve operation and reliability even under high-frequency operation. Spring 3 not only drives the movement of the valve core 2 but also plays a key role in maintaining a tight seal. The selection of spring 3 should consider its material and elasticity. In this embodiment, spring 3 is made of stainless steel, which offers high elasticity and fatigue resistance, ensuring its performance remains unchanged over long periods of use. The corrosion resistance of stainless steel also makes it suitable for use with a variety of fluid media, including those that are chemically active or corrosive. The preload of spring 3 is another critical parameter in pressure-maintaining valve design. This preload must be precisely set based on the valve's operating conditions and fluid characteristics. The correct preload ensures stable contact between the valve core 2 and the valve seat 4 under varying operating pressures, achieving a good seal. Excessive preload may cause premature valve wear or damage to the sealing surface; too little preload may result in a loose seal, impacting valve performance.

[0026] like Figure 1 and Figure 2 and Figure 3As shown, the valve seat 4 is positioned below the valve core 2 and is responsible for forming a seal with the valve core 2. The valve seat 4 is made of metal. A tapered surface is positioned on the inner side of the top of the valve seat 4, which engages with the slope of the frustoconical tapered surface 2.2 of the valve core 2. This fit enhances the sealing effect and uniform force transmission between the valve seat 4 and the valve core 2, ensuring valve reliability. The top of the tapered surface is positioned above the top of the U-shaped groove 2.3, while the bottom is positioned below the bottom of the U-shaped groove 2.3. This allows the U-shaped groove 2.3 to be trapped between the tapered surfaces, enhancing the sealing. The tapered surface design on the inner side of the valve seat 4 creates a tighter fit between the valve seat 4 and the valve core 2, improving the sealing effect. The angle of the tapered surface is optimized to ensure good sealing performance under varying pressures. Four retaining blocks 4.2 are circumferentially positioned at the bottom of the valve seat 4. These retaining blocks 4.2 have a trapezoidal cross-section, and the retaining groove 1.4 is an annular groove extending along the circumference of the valve body. The four retaining blocks 4.2 are symmetrically positioned along the central axis of the valve seat 4. When the valve seat 4 is not installed, the outer diameter of the retaining blocks 4.2 is the same as the outer diameter of the top of the valve seat 4. That is, the outer edge of the retaining blocks 4.2 is aligned with the outer edges of the rest of the valve seat 4. To install the valve seat 4, first place the valve body 1 in the corresponding position, with the retaining blocks 4.2 positioned at the opening of the retaining groove 1.4. The riveting equipment is then positioned between the valve seat 4 and the retaining blocks 4.2, forcing the retaining blocks 4.2 of the valve seat 4 into the retaining groove 1.4 of the valve body 1. When the valve seat 4 is installed, the outer diameter of the retaining blocks 4.2 is larger than the outer diameter of the top of the valve seat 4, thereby securing and sealing the valve. The outer diameter of the top of the valve seat 4 is smaller than the inner diameter of the valve body 1 where the valve seat 4 is installed. This reduces the number of components, significantly lowers costs, and improves product reliability. The valve seat 4 is equipped with a circumferential sealing groove 4.1 above the retaining blocks 4.2, which houses a sealing ring 5. This design further enhances the valve's sealing performance and ensures stable operation under high-pressure conditions. The depth and width of the sealing groove 4.1 should be reasonably designed to adapt to different working conditions.

[0027] Assembly process.

[0028] 1. First, install the O-ring 6 into the U-shaped groove 2.3 of the valve core 2.

[0029] 2. Install spring 3 into the inner hole 2.1 of the valve core.

[0030] 3. Install the valve core 2 into the valve body 1.

[0031] 4. Install the sealing ring 5 into the sealing groove 4.1 of the valve seat 4, and then place the valve seat 4 into the valve body 1.

[0032] 5. Place the riveting equipment inside the bottom end of the valve seat 4 and press the valve seat 4 into the valve body 1. At the same time, the accumulated material of the valve seat 4, i.e., the block 4.2, is filled into the groove 1.4 of the valve seat 4 to form a fixed and sealed structure.

[0033] Example 2.

[0034] like Figure 4 and Figure 5 Except for the sealing structure between the valve seat 4 and the valve body 1, Example 2 maintains the same design as Example 1, including the valve core 2 and spring 3. In Example 2, the outer wall of the valve seat 4 is provided with a rounded step 4.3 along the circumference. The corners of the rounded step 4.3 are rounded, and the valve body 1 is provided with a right-angled step 1.5 that mates with the rounded step 4.3. This precise fit ensures a tight seal between the valve seat 4 and the valve body 1 while also providing sufficient mechanical support. When the valve seat 4 is pressed into the valve body 1, the material of the valve body 1 is squeezed, causing the right-angled step 1.5 to fill the rounded corners of the rounded step 4.3 on the valve seat 4. This unique fixing method not only creates a solid fixing point but also provides an excellent seal. This design further strengthens the connection between the valve seat 4 and the valve body 1, effectively preventing potential fluid leakage under high-pressure conditions and ensuring the valve's tightness and reliability under various operating conditions. This sealing structure offers additional advantages. By eliminating the use of traditional components such as threads, manufacturing costs are significantly reduced while also improving product reliability. The simplified structure reduces potential failure points, making the valve more stable during long-term operation and reducing the frequency and cost of maintenance.

[0035] Assembly process.

[0036] 1. First, install the O-ring 6 into the U-shaped groove 2.3 of the valve core 2.

[0037] 2. Install spring 3 into the inner hole 2.1 of the valve core.

[0038] 3. Install the valve core 2 into the valve body 1.

[0039] 4. Finally, place the valve seat 4 into the valve body 1.

[0040] 5. Place the riveting equipment inside the bottom end of the valve seat 4 and press the valve seat 4 into the valve body 1. At the same time, the accumulated material of the valve body 1, i.e. the right-angle step 1.5, is filled into the rounded corner of the rounded step 4.3 of the valve seat 4 to form a fixed and sealed structure.

[0041] During installation, pay attention to the following points: 1. Cleaning: Ensure all components are clean before assembly to prevent impurities from affecting sealing performance. 2. Lubrication: Apply an appropriate amount of lubricant to the contact surface between the valve core 2 and the valve seat 4 to reduce wear. 3. Tightening: When installing the valve seat 4, ensure that the clamping block 4.2 fits tightly with the clamping groove 1.4, the rounded step 4.3, and the right-angle step 1.5 to prevent leakage caused by looseness.

[0042] Technical requirements.

[0043] 1. Performance requirements: The opening pressure of the pressure maintaining valve is 300KPa±30KPa, and the outlet flow rate is greater than or equal to 300L / min under the opening pressure of 800KPa±15KPa.

[0044] 2. The pressure maintaining valve port is sealed without leakage (in the one-way sealing state).

[0045] 3. Working environment temperature: -40℃~100℃, storage temperature: -40℃~60℃.

[0046] 4. Chemical corrosion resistance and salt spray test performance should meet the requirements of QC / T 1108-2019.

[0047] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A pressure-maintaining valve, characterized in that: A valve seat is provided in the valve body, and a sealing groove is provided on the outer wall of the valve seat; The bottom end of the valve seat is provided with a number of blocks along the circumferential direction, and the valve body is provided with a groove that matches the blocks; The outer diameter of the clamping block when the valve seat is not installed is the same as the outer diameter of the top end of the valve seat, and the outer diameter of the clamping block when the valve seat is installed is larger than the outer diameter of the top end of the valve seat.

2. A pressure-maintaining valve according to claim 1, characterized in that: The cross section of the clamping block is trapezoidal, and the clamping groove is an annular groove arranged along the circumferential direction of the valve body.

3. A pressure-maintaining valve according to claim 1 or 2, characterized in that: The plurality of clamping blocks are centrally symmetrical along the center axis of the valve seat.

4. The pressure-maintaining valve according to claim 1, characterized in that: The outer diameter of the top of the valve seat is smaller than the inner diameter of the valve seat installation location in the valve body.

5. The pressure-maintaining valve according to claim 1, characterized in that: A sealing ring is provided in the valve seat sealing groove.

6. The pressure-maintaining valve according to claim 3, characterized in that: A valve core is arranged above the valve seat, a valve core inner hole is arranged at one end of the valve core, and a spring is arranged in the valve core inner hole.

7. A pressure-maintaining valve according to claim 4 or 6, characterized in that: A conical inclined surface is provided on the inner side of the top end of the valve seat, and the conical inclined surface is clamped on the inclined surface of the frustum-shaped conical surface at the bottom end of the valve core.

8. The pressure-maintaining valve according to claim 6, characterized in that: One end of the spring is connected to the bottom end of the valve core, and the other end is connected to the mounting platform at the opening of the valve body.

9. A pressure-maintaining valve, characterized in that: A valve seat is provided in the valve body, and a rounded step is provided on the outer wall of the valve seat along the circumferential direction, and a rounded corner is provided at the turning point of the step. A right-angle step matching the rounded step is provided on the inner wall of the valve body. The outer diameter of the bottom end of the rounded step when the valve seat is not installed is the same as the outer diameter of the top end of the valve seat, and the outer diameter of the bottom end of the rounded step when the valve seat is installed is larger than the outer diameter of the top end of the valve seat.

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