A decoupled fluid self-sealing relief valve

Abstract

This invention discloses a decoupled fluid self-sealing relief valve, relating to the field of relief valve technology. The decoupled fluid self-sealing relief valve includes: a valve body and a first cavity and a second cavity disposed within the valve body, the first cavity being connected to a pressure relief channel on the valve body; a sealing seat with a flow channel; a sealing module including: a valve stem slidably disposed within the first cavity, a pressure chamber at the first end of the valve stem, a first elastic element disposed within the pressure chamber, and a valve core coaxial with the flow channel at one end of the first elastic element; and a pressure regulating module including: a second elastic element disposed within the second cavity, one end of the second elastic element abutting against the second end of the valve stem. The aforementioned decoupled fluid self-sealing relief valve solves the technical problems of existing relief valves, such as loose seals under high pressure, increased internal leakage, high valve core opening resistance, delayed relief response, and drift in relief pressure setpoints and decreased control accuracy.

Description

Technical Field

[0001] This invention relates to the field of relief valve technology, and in particular to a decoupled fluid self-sealing relief valve. Background Technology

[0002] Relief valves are core components in hydraulic control systems, providing overpressure protection and system pressure stabilization. They are widely used in industrial hydraulics, high-pressure fluid equipment, and hydraulic transmission systems. Their primary function is to automatically open and release pressure when the system pressure exceeds a set safety threshold, preventing damage to pipelines and actuators due to instantaneous high pressure and ensuring system safety and pressure stability. Existing conventional single-spring conical seal direct-acting relief valves employ a working logic of direct resistance between spring force and hydraulic pressure. The system pressure oil acts directly on the bottom of the valve core, generating an upward opening thrust that counteracts the downward sealing force of the spring.

[0003] However, the aforementioned relief valve has the following drawbacks: On the one hand, as the system pressure increases, the hydraulic thrust continuously increases, constantly offsetting the sealing clamping force of the spring. The sealing surface fit decreases continuously with increasing pressure, resulting in inherent defects such as loosening of the seal and increased internal leakage under high pressure. On the other hand, the valve core opening requires the hydraulic thrust to completely overcome the spring preload. Because the spring needs to balance high-pressure sealing, it is forced to be designed with high stiffness and large preload, resulting in high valve core opening resistance and delayed relief response. This makes it impossible to release high pressure in time, causing damage to related components in the hydraulic control system due to instantaneous overpressure. At the same time, the spring bears the combined high load of sealing and pressure regulation for a long time, which easily leads to fatigue and decay, causing the relief pressure setpoint to drift and the control accuracy to decrease. Therefore, a decoupled fluid self-sealing relief valve is proposed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a decoupled fluid self-sealing relief valve, which solves the inherent defects of existing relief valves such as loose seals under high pressure, increased internal leakage, large valve core opening resistance, delayed relief response, and drift of relief pressure setpoint and decreased control accuracy.

[0005] To achieve the above objectives, the present invention provides a decoupled fluid self-sealing relief valve, comprising: a valve body and a first cavity and a second cavity disposed inside the valve body, wherein the first cavity is connected to a pressure relief channel on the valve body;

[0006] A sealing seat is disposed on the valve body for sealing the first cavity, and the sealing seat is provided with a flow channel for communicating with the first cavity;

[0007] A sealing module is disposed in the first cavity. The sealing module includes: a valve stem slidably disposed in the first cavity, a pressure chamber disposed at the first end of the valve stem, the pressure chamber being connected to the first cavity, a first elastic element disposed in the pressure chamber, and a valve core coaxial with the flow channel disposed at one end of the first elastic element, the valve core being used to block the flow channel.

[0008] A pressure regulating module is disposed in the second cavity. The pressure regulating module includes a second elastic element disposed in the second cavity. One end of the second elastic element abuts against the second end of the valve stem. The second elastic element can be compressed to adjust its compression amount.

[0009] Preferably, the sealing module further includes: a sealing element disposed in the first cavity, the sealing element having a through first through hole for passing through the valve stem, and the first through hole being interference-fitted with the valve stem.

[0010] Preferably, the inner sidewall of the first cavity is provided with a first assembly groove and a second assembly groove. A sealing baffle is snapped into the first assembly groove, and an elastic retaining ring is snapped into the second assembly groove. One end of the elastic retaining ring abuts against one side of the sealing baffle, and the other side of the sealing baffle abuts against the sealing element.

[0011] Preferably, a connecting threaded sleeve is provided at the second end of the valve stem, and a second through hole coaxial with the flow channel is provided on the connecting threaded sleeve. The valve core passes through the second through hole, and an annular boss is provided at one end of the valve core. The end face of the annular boss abuts against the inner sidewall of the connecting threaded sleeve.

[0012] Preferably, the end of the valve core near the flow channel is cone-shaped, and the end of the flow channel is provided with a conical surface adapted to the valve core.

[0013] Preferably, the pressure regulating module further includes: a first guide seat disposed at one end of the second elastic element, the first guide seat being slidably connected to the inner sidewall of the second cavity, a first pressure cap disposed at the first end of the valve body, the first pressure cap being threadedly connected to an adjusting bolt, and one end of the adjusting bolt abutting against the first guide seat.

[0014] Preferably, a second guide seat is provided at the other end of the second elastic member, the second guide seat is slidably connected to the inner sidewall of the second cavity, and a mating groove is provided on one side of the second guide seat, the first end of the valve stem abuts against the mating groove.

[0015] Preferably, a locking nut is threaded onto the outer peripheral side of the adjusting bolt, and one side of the locking nut abuts against the end face of the first pressure cap.

[0016] Preferably, a dust cover is provided at one end of the first pressure cap, and the dust cover is provided on the outside of the adjusting bolt.

[0017] Preferably, a second pressure cap is provided at the second end of the valve body, and the second pressure cap abuts against the sealing seat.

[0018] Compared with the above-mentioned background technology, the decoupled fluid self-sealing relief valve provided by the present invention has the following beneficial effects:

[0019] (1) In this invention, the pressure chamber is connected to the first chamber. The fluid medium in the pressure chamber provides a supporting force to the valve core. The higher the pressure of the fluid medium in the first chamber, the greater the supporting force provided by the fluid medium in the pressure chamber to the valve core, and the better the sealing between the valve core and the flow channel. Thus, a fluid self-sealing structure with stronger sealing performance at higher pressure is constructed. There are no defects such as loose sealing and increased internal leakage under high pressure, which effectively solves the problem of high pressure sealing failure of the overflow valve.

[0020] (2) In this invention, the product of the radial cross-sectional area of ​​the flow channel and the overflow pressure setting value is the elastic force required by the second elastic element in the pressure regulating module to provide to the valve stem. When the pressure value of the fluid medium in the first cavity is greater than the overflow pressure setting value, the fluid medium pushes the valve stem to move against the elastic force of the second elastic element until the valve stem drives the valve core to leave the flow channel, thereby accurately controlling the valve body to release pressure. The sealing module is used to seal the flow channel. The pressure regulating module and the sealing module are functionally and mechanically independent and decoupled from each other, and have no connection. Since the elastic force required by the second elastic element to provide to the valve stem is small, the second elastic element does not need to take into account the high pressure sealing, so it does not need to be designed with high rigidity and large preload, thereby reducing the resistance when the valve core leaves the flow channel and accelerating the overflow response speed, so as to release high pressure in time and effectively prevent the relevant components in the hydraulic control system from being damaged by instantaneous overpressure; moreover, the second elastic element does not need to bear the combined high load of sealing and pressure regulation for a long time. The force is single and pure and not easy to fatigue and decay over a long period of time, thereby ensuring that the overflow valve maintains the stability and control accuracy of the overflow pressure setting value during long-term use.

[0021] (3) In this invention, since the elastic force required by the second elastic element to the valve stem is small, when the pressure of the fluid medium in the first cavity is less than the overflow pressure setting value, the valve core only needs a small pressure drop when it contacts and blocks the flow channel. After the valve core contacts and blocks the flow channel, the self-sealing mechanism is instantly rebuilt, effectively reducing the pressure difference before and after the valve core blocks the flow channel, realizing the dynamic adjustment of the valve core without oscillation or sudden force change, so that the internal pressure of the overall valve body is quickly stabilized, effectively improving the stability of the overflow valve during use.

[0022] (4) In this invention, the first elastic element maintains the initial compression in the sealed state and plays a certain elastic buffering role in the process of the valve core leaving or blocking the flow channel. When the pressure of the fluid medium in the first cavity is greater than the overflow pressure setting value and pressure is released, the fluid medium pushes the valve stem to move against the elastic force of the second elastic element. After the valve core leaves the flow channel, the self-sealing mechanism is released. When the fluid medium in the first cavity is less than the overflow pressure setting value, the elastic force of the fluid medium and the second elastic element pushes the valve stem to move. In the process of the valve core contacting and blocking the flow channel, the first elastic element is compressed and contracted until the valve core is completely blocked. The first elastic element is compressed and contracted to provide a flexible buffering force to the valve core, avoid the valve core from rigidly impacting the sealing seat, and realize the smooth reset of the valve core. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a cross-sectional schematic diagram of the overflow valve provided in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of the overflow valve at point A when it is sealed;

[0026] Figure 3 for Figure 1 An enlarged schematic diagram of the relief valve at point A during pressure relief.

[0027] Specifically, 1-valve body; 101-first cavity; 102-second cavity; 103-pressure relief channel; 2-sealing seat; 201-flow channel; 3-sealing module; 301-valve stem; 302-pressure chamber; 303-first elastic element; 304-valve core; 3041-annular boss; 305-sealing element; 306-sealing baffle; 307-elastic retaining ring; 308-connecting threaded sleeve; 309-fluid channel; 4-pressure regulating module; 401-second elastic element; 402-first guide seat; 403-second guide seat; 4031-connecting groove; 404-first pressure cap; 405-adjusting bolt; 406-locking nut; 5-dust cover; 6-second pressure cap. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, to achieve the above objectives, the present invention provides a decoupled fluid self-sealing relief valve, comprising: a valve body 1 and a first cavity 101 and a second cavity 102 disposed independently inside the valve body 1. The first cavity 101 and the second cavity 102 are sequentially disposed inside the valve body 1 along its length. The first cavity 101 is connected to a pressure relief channel 103 on the valve body 1, meaning that the fluid medium flows to the first cavity 101 through the pressure relief channel 103. A sealing seat 2 is provided on the valve body 1 to seal the right side of the first cavity 101. The sealing seat 2 has a flow channel 201 that communicates with the first cavity 101, further discharging the fluid medium within the first cavity 101 through the flow channel 201 to complete the pressure relief. The fluid medium can be system pressure oil in a hydraulic system or fluid media in other pressure systems, such as high-pressure steam in a steam boiler. This application uses system pressure oil in a hydraulic system as an example for illustration.

[0031] A sealing module 3 is provided inside the first cavity 101. The sealing module 3 includes: a valve stem 301 slidably disposed inside the first cavity 101; a pressure chamber 302 is provided at the right end of the valve stem 301; the pressure chamber 302 is connected to the first cavity 101 through a fluid channel 309; the fluid channel 309 is arranged on the circumferential outer side of the right end of the valve stem 301; a first elastic element 303 is provided inside the pressure chamber 302; optionally, the first elastic element 303 is a spring; a valve core 304 coaxial with the flow channel 201 is connected to the right end of the first elastic element 303; the valve core 304 is used to block the flow channel 201. The pressure chamber 302 is connected to the first chamber 101. The fluid medium in the pressure chamber 302 provides a holding force, or sealing and clamping force, to the valve core 304. The higher the pressure of the fluid medium in the first chamber 101, the greater the holding force provided by the fluid medium in the pressure chamber 302 to the valve core 304, and the better the sealing between the valve core 304 and the flow channel 201. This creates a fluid self-sealing structure with stronger sealing performance at higher pressures, eliminating the defects of loose seals and increased internal leakage under high pressure, and effectively solving the problem of high-pressure seal failure of the relief valve.

[0032] It should be noted that, under sealed conditions, the sealing clamping force is independently provided by the fluid medium in the pressure chamber 302. The elastic force of the second elastic element 401 only plays an auxiliary role. The maximum effective area of ​​the fluid medium in the pressure chamber 302 acting on the flow channel 201 can be denoted as S. S is also the radial cross-sectional area of ​​the flow channel 201, which is the clamping force F generated by the fluid medium in the pressure chamber 302 on the valve core 304, pointing vertically towards the flow channel 201. Here, F = P × S, where P represents the pressure of the fluid medium in the first cavity 101 or the pressure chamber 302. That is, the higher the pressure, the greater the sealing clamping force.

[0033] It should be further explained that the first elastic element 303 maintains its initial compression in the sealed state to ensure that the valve core 304 always blocks the flow channel 201 in the sealed state of the valve body 1. This provides a certain elastic buffering effect during the process of the valve core 304 leaving or blocking the flow channel 201. When the pressure of the fluid medium in the first cavity 101 is greater than the overflow pressure setting value and pressure is released, the fluid medium pushes the valve stem 301 to move against the elastic force of the second elastic element 401. After the valve core 304 leaves the flow channel 201, the self-sealing mechanism is released. When the fluid medium in the first cavity 101 is less than the overflow pressure setting value, the elastic force of the fluid medium and the second elastic element 401 pushes the valve stem 301 to move. During the process of the valve core 304 contacting and blocking the flow channel 201, the first elastic element 303 is compressed and contracts until the valve core 304 completely blocks the flow channel 201. The first elastic element 303 provides a flexible buffering force to the valve core 304, avoiding rigid impact between the valve core 304 and the sealing seat 2, thus achieving smooth reset of the valve core 304. At the same time, it prevents frequent hard impact between the valve core 304 and the sealing seat 2 and the connecting screw sleeve 308, avoiding pitting and wear of the valve core 304 and the sealing seat 2, further preventing internal leakage of the valve body 1 under high pressure, and extending the overall service life of the relief valve.

[0034] A pressure regulating module 4 is installed inside the second cavity 102. The pressure regulating module 4 includes a second elastic element 401 disposed inside the second cavity 102. Optionally, the second elastic element 401 is a spring. The right end of the second elastic element 401 abuts against the left end of the valve stem 301 to provide the required elastic force to the valve stem 301. The product of the radial cross-sectional area S of the flow channel 201 and the overflow pressure setting value is the required elastic force provided by the second elastic element 401 to the valve stem 301 in the pressure regulating module 4. When the pressure value of the fluid medium in the first cavity 101 is greater than the overflow pressure setting value, the fluid medium pushes the valve stem 301 to move to the left against the elastic force of the second elastic element 401 until the valve stem 301 drives the valve core 304 to disengage from the flow channel 201, thereby precisely controlling the valve body 1 to release pressure. The sealing module 3 is used to seal the flow channel 201. The pressure regulating module 4 and the sealing module 3 are functionally and mechanically independent and decoupled from each other. Since the elastic force required by the second elastic element 401 to provide to the valve stem 301 is relatively small, the second elastic element 401 does not need to take into account high-pressure sealing. Therefore, it does not need to be designed with high rigidity and large preload, thereby reducing the resistance when the valve core 304 leaves the flow channel 201 and accelerating the overflow response speed. This allows for timely release of high pressure and effectively prevents damage to related components in the hydraulic control system due to instantaneous overpressure. Moreover, the second elastic element 401 does not need to bear the combined high load of sealing and pressure regulation for a long time. The force is singular and pure and is not prone to fatigue attenuation over a long period of time. This ensures that the overflow valve maintains the stability and control accuracy of the overflow pressure setting value during long-term use.

[0035] It should be noted that the second elastic element 401 can be compressed to adjust its compression amount, thereby changing its own elastic potential energy, so that it can provide a preset elastic force to the valve stem 301. Since the area S of the radial cross section of the flow channel 201 remains unchanged, the overflow pressure setting value changes synchronously, thereby enabling precise adjustment of the overflow pressure setting value. The overflow pressure setting value is not related to the sealing clamping force, so that the overall selection and debugging of the overflow valve can achieve quantitative and precise control, eliminate the interference of the sealing clamping force on the pressure adjustment accuracy, and effectively ensure the reliability of the overflow valve.

[0036] It should be further explained that the sealing function is achieved by the cooperation between the valve core 304 and the outlet on the sealing seat 2. The sealing force is independently provided by the pressure of the fluid medium in the pressure chamber 302 and has no mechanical relationship with the second elastic element 401 in the pressure regulating module. The second elastic element 401 only undertakes the pressure regulating function, and the balance valve stem 301 is subjected to the net thrust of the fluid medium in the first chamber 101. When the pressure of the hydraulic control system exceeds the overflow pressure setting value and dynamic pressure stabilization of the overflow valve is required, the valve core 304 slightly moves away from the outlet, and the sealing pressure of the fluid medium in the pressure chamber 302 on the valve core 304 disappears instantaneously. However, the force state of the second elastic element 401 does not change abruptly, and no excessive elastic force is generated, ensuring that the valve core 304 operates smoothly without impact. On the other hand, since the elastic force required by the second elastic element 401 to provide to the valve stem 301 is small, when the pressure of the hydraulic control system drops slightly to below the overflow pressure setting value, the second elastic element 401 pushes the valve core 304 to quickly return to its seat. The valve core 304 only needs a small pressure drop to contact and block the flow channel 201. The pressure attenuation of the overflow valve is minimal. After the valve core 304 contacts and blocks the flow channel 201, the self-sealing mechanism is instantly rebuilt, and the sealing pressure is quickly established, so that the valve core 304 is stably closed. The valve core 304 dynamically adjusts without oscillation or rebound, which can effectively reduce the pressure difference before and after the valve core 304 blocks the flow channel 201. This achieves dynamic adjustment of the valve core 304 without oscillation or sudden force changes, and the pressure stabilization response speed is significantly improved, so that the pressure in the hydraulic control system is quickly stabilized near the overflow pressure setting value. Furthermore, during the entire dynamic pressure stabilization process, the valve core 304 only undergoes high-frequency adjustment between closure and slight opening. The sealing clamping force and the elastic force required by the second elastic element 401 to provide to the valve stem 301 do not interfere with each other, effectively improving the stability of the relief valve during use. On the other hand, the second elastic element 401 and the fluid medium inside the pressure chamber 302 work together to form an elastic-damping effect, further suppressing the vibration of the valve core 304 and improving the pressure stabilization response speed and operational stability of the relief valve.

[0037] In some embodiments of the present invention, the sealing module 3 further includes: a sealing element 305 disposed in the first cavity 101, the sealing element 305 having a through first through hole, optionally the first through hole being cylindrical, the first through hole being used to pass through the valve stem 301, and the first through hole being interference fit with the valve stem 301, so that during the reciprocating sliding of the valve stem 301 along the axial direction, the sealing element 305 can always be stably fitted with the outer surface of the valve stem 301 to prevent leakage of the high-pressure fluid medium in the first cavity 101 along the fitting gap between the valve stem 301 and the sealing element 305, and at the same time can provide a uniform and appropriate radial clamping force when the valve stem 301 moves along the axial direction, thereby improving the sealing reliability and structural stability of the valve stem 301 during dynamic movement without affecting the normal sliding of the valve stem 301, and enhancing the sealing performance and operational reliability of the entire relief valve under high pressure conditions.

[0038] In some embodiments, the inner wall of the first cavity 101 is provided with a first assembly groove and a second assembly groove. A sealing baffle 306 is engaged in the first assembly groove, and an elastic retaining ring 307 is engaged in the second assembly groove. One end of the elastic retaining ring 307 abuts against one side of the sealing baffle 306, and the other side of the sealing baffle 306 abuts against the sealing element 305. The elastic retaining ring 307 provides reliable axial limiting and locking, enabling the sealing baffle 306 to form a stable and uniform axial pressing force on the sealing element 305, thereby causing the outer circumferential surface of the sealing element 305 to contact the first assembly groove. The inner wall of the first cavity 101 always remains in a tight fit. When a high-pressure fluid medium is introduced into the first cavity 101, the medium pressure will directly act on the seal 305, further pressing the seal 305 against the inner wall of the first cavity 101, forming a self-sealing effect that automatically strengthens as the pressure increases. This prevents gaps from forming in the seal 305 due to loose assembly or pressure fluctuations, and prevents the fluid medium from leaking out through the fit gap between the seal 305 and the inner wall of the first cavity 101, effectively improving the sealing reliability of the relief valve under high pressure and dynamic operating conditions.

[0039] In some embodiments of the present invention, a connecting screw sleeve 308 is provided at the right end of the valve stem 301. Optionally, an internal thread is provided at the left end of the connecting screw sleeve 308, and an external thread adapted to the internal thread is provided at the right end of the valve stem 301. The connecting screw sleeve 308 is fixedly connected to the right end of the valve stem 301 by a threaded connection to form a rigid integrated structure. The connecting screw sleeve 308 serves as a force transmission carrier between the valve stem 301 and the valve core 304, ensuring the accuracy of force transmission and the integrity of the structure, and also acts as a storage carrier for the valve core 304. In addition, a second through hole coaxial with the flow channel 201 is provided on the connecting threaded sleeve 308. The valve core 304 is movably inserted into the second through hole. One end of the valve core 304 is integrally formed with an annular boss 3041. The end face of the annular boss 3041 abuts against the inner sidewall of the connecting threaded sleeve 308, forming a reliable axial limiting structure to prevent the valve core 304 from coming out of the pressure chamber 302 during axial movement. This avoids the overflow valve from failing to seal due to the valve core 304 falling off. At the same time, the connecting threaded sleeve 308 and the pressure chamber 302 can cooperate to form a storage function, so that the valve core 304 is always in a stable assembly position, improving the overall structural stability of the overflow valve.

[0040] In some embodiments of the present invention, the end of the valve core 304 near the flow channel 201 is set in a conical shape, that is, the right end of the valve core 304 is set in a conical shape, and the left end of the flow channel 201 is provided with a conical surface adapted to the taper of the valve core 304. The right end of the valve core 304 and the left end of the flow channel 201 fit together to form a reliable conical sealing pair, which can achieve automatic centering when the valve core 304 contacts the flow channel 201, and automatically adjust the coaxiality between the valve core 304 and the flow channel 201, ensuring accurate sealing position and uniform sealing surface fit, and avoiding sealing failure due to eccentricity or misalignment. At the same time, the conical sealing pair can form a line seal or a narrow surface seal in the closed state, and can obtain a higher sealing specific pressure under the same medium pressure, further improving sealing reliability.

[0041] In some embodiments of the present invention, the pressure regulating module 4 further includes: a first guide seat 402 disposed at the left end of the second elastic member 401, the first guide seat 402 forming a sliding fit with the inner wall of the second cavity 102, and being able to move smoothly axially along the inner wall of the second cavity 102; simultaneously, a first pressure cap 404 is disposed at the left end of the valve body 1, the first pressure cap 404 being connected to the left end of the valve body 1 by a connecting screw; and the first pressure cap 404 is threadedly connected to an adjusting bolt 405, the right end of the adjusting bolt 405 abutting against the first guide seat 402, and the adjusting bolt 405 being screwed on. 5. The elastic force of the second elastic element 401 can be adjusted, thereby adjusting the overflow pressure setting value. During the extension and retraction of the second elastic element 401, the first guide seat 402 can effectively limit and correct it, ensuring that the second elastic element 401 always extends and retracts linearly along the set central axis, avoiding skewness or lateral sway, thus ensuring that the direction of force transmission is always consistent with the direction of movement of the valve stem 301, eliminating the force deviation and adjustment error caused by the eccentric movement of the second elastic element 401, and improving the adjustment accuracy and control stability of the overflow pressure. At the same time, the sliding fit structure between the first guide seat 402 and the second cavity 102 can also reduce the frictional resistance and jamming risk during the movement. Combined with the precise adjustment function of the adjusting bolt 405, it improves the straightness and coaxiality of the movement of the second elastic element 401, providing stable support and guidance for the entire pressure regulating module 4, and further improving the stability of the overflow valve during long-term operation.

[0042] In some embodiments of the present invention, a second guide seat 403 is provided at the right end of the second elastic member 401. The second guide seat 403 forms a sliding fit with the inner wall of the second cavity 102, enabling it to move smoothly axially along the inner wall of the second cavity 102. This limits and corrects the extension and retraction path of the second elastic member 401, ensuring that the second elastic member 401 always maintains coaxial linear motion during extension and retraction, without swaying or eccentric force. A docking groove 4031 is provided on the side of the second guide seat 403 facing the valve stem 301. The left end of the valve stem 301 stably abuts against the docking groove 4031. Through the positioning constraint of the docking groove 4031 and the guiding support of the second guide seat 403, the force transmission between the valve stem 301 and the second elastic member 401 is made more uniform, improving the accuracy and stability of the overflow pressure setting value. This makes the pressure regulating module 4 move more smoothly and respond more accurately during dynamic operation, providing reliable structural support for the axial movement of the valve stem 301 and effectively enhancing the overall reliability of the overflow valve.

[0043] In some embodiments of the present invention, the outer peripheral side of the adjusting bolt 405 is threadedly connected to the locking nut 406, and the right side of the locking nut 406 abuts against the left end face of the first pressure cover 404. When the adjusting bolt 405 is rotated and adjusted to the position and the required overflow pressure setting value is set, the locking nut 406 can be tightened along the thread axis of the adjusting bolt 405 and press against the first pressure cover 404 to form a reliable anti-loosening locking structure. This prevents the adjusting bolt 405 from loosening or rotating due to force fluctuations during long-term high-pressure, vibration and dynamic operation of the overflow valve, so that the pressure adjustment position always remains stable. This effectively ensures the adjustment accuracy of the pressure regulating module 4 and the long-term stability of the overflow pressure setting value, thereby improving the overall stability of the overflow valve.

[0044] In some embodiments of the present invention, a dust cover 5 is provided at the left end of the first pressure cover 404. The dust cover 5 is completely covered in the external space of the adjusting bolt 405, forming a closed protective structure that prevents dust, impurities, moisture and oil from the external environment from entering the threaded mating area between the adjusting bolt 405 and the first pressure cover 404. This ensures that the adjusting bolt 405 can rotate smoothly and adjust accurately during long-term use, thereby improving the service life and operational reliability of the entire pressure regulating module 4.

[0045] In some embodiments of the present invention, a second pressure cap 6 is provided at the second end of the valve body 1, and the second pressure cap 6 abuts against the sealing seat 2. Specifically, an internal thread is provided at the right end of the valve body 1, and an external thread adapted to the internal thread is provided at the left end of the second pressure cap 6. The left end face of the second pressure cap 6 directly and tightly abuts against the end position of the sealing seat 2. The second pressure cap 6 forms a stable axial clamping force on the sealing seat 2, so that the sealing seat 2 can be firmly positioned in the preset installation position inside the valve body 1, avoiding the sealing seat 2 from loosening under the impact of high pressure fluid medium or valve stem 301, thereby preventing the fluid medium from leaking from the mating part between the sealing seat 2 and the valve body 1.

[0046] The working principle of this invention is as follows: When the pressure of the fluid medium in the first cavity 101 is less than the overflow pressure setting value, the second elastic element 401 pushes the valve stem 301 to maintain its initial position through the second guide seat 403. The connecting screw sleeve 308 is positioned synchronously with the valve stem 301. Under the support of the first elastic element 303, the valve core 304 is tightly fitted with the conical surface of the flow channel 201 to form a conical sealing pair to block the flow channel 201. At the same time, the fluid medium in the pressure chamber 302 acts on the valve core 304 to form a self-sealing mechanism. When the pressure of the fluid medium in the first cavity 101 increases and exceeds the overflow pressure setting value, the fluid medium in the first cavity 101 pushes the valve stem 301 to move axially against the elastic force of the second elastic element 401, and further drives the valve core 304 to disengage from the flow channel 201, and the fluid medium is depressurized through the flow channel 201. When the pressure of the fluid medium in the first cavity 101 drops to less than the overflow pressure setting value, the second elastic element 401 resets and pushes the valve stem 301 and valve core 304 back to their original positions simultaneously. The valve core 304 is the first to contact the flow channel 201 and quickly rebuild the fluid self-sealing mechanism.

[0047] In summary, the fluid medium in pressure chamber 302 provides a holding force to valve core 304. The higher the pressure of the fluid medium in the first chamber 101, the greater the holding force provided by the fluid medium in pressure chamber 302 to valve core 304, resulting in better sealing between valve core 304 and flow channel 201. This constructs a fluid self-sealing structure where the higher the pressure, the stronger the sealing performance, eliminating the defects of loose seals and increased internal leakage under high pressure. The pressure regulating module 4 and sealing module 3 are functionally and mechanically independent and decoupled. Moreover, the second elastic element 401 does not need to be designed with high rigidity and large preload, thereby reducing the resistance when valve core 304 leaves flow channel 201 and accelerating the overflow response speed; it does not need to bear the combined high load of sealing and pressure regulation for a long time, and the force is singular and pure, and it is not prone to fatigue attenuation over a long period of time, thus ensuring the stability and control accuracy of the overflow pressure setting value of the overflow valve during long-term use.

[0048] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0049] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A decoupled fluid self-sealing spill valve characterized by, include: The valve body (1) includes a first cavity (101) and a second cavity (102) disposed inside the valve body (1), wherein the first cavity (101) is connected to the pressure relief passage (103) of the valve body (1). A sealing seat (2) is provided on the valve body (1) for sealing the first cavity (101). The sealing seat (2) is provided with a flow channel (201) for communicating with the first cavity (101). A sealing module (3) is disposed in the first cavity (101). The sealing module (3) includes: a valve stem (301) slidably disposed in the first cavity (101), a pressure chamber (302) is provided at the first end of the valve stem (301), the pressure chamber (302) is connected to the first cavity (101), a first elastic element (303) is provided in the pressure chamber (302), and a valve core (304) coaxial with the flow channel (201) is provided at one end of the first elastic element (303). The valve core (304) is used to block the flow channel (201). A pressure regulating module (4) is disposed in the second cavity (102). The pressure regulating module (4) includes a second elastic element (401) disposed in the second cavity (102). One end of the second elastic element (401) abuts against the second end of the valve stem (301). The second elastic element (401) can be compressed to adjust its compression amount. The sealing module (3) further includes: a sealing element (305) disposed in the first cavity (101), the sealing element (305) having a through first through hole for passing through the valve stem (301), and the first through hole being press-fitted with the valve stem (301); The inner wall of the first cavity (101) is provided with a first assembly groove and a second assembly groove. A sealing baffle (306) is snapped into the first assembly groove, and an elastic retaining ring (307) is snapped into the second assembly groove. One end of the elastic retaining ring (307) abuts against one side of the sealing baffle (306), and the other side of the sealing baffle (306) abuts against the sealing element (305).

2. The decoupled fluid self-sealing spill valve of claim 1, wherein, The valve stem (301) is provided with a connecting threaded sleeve (308) at its second end. The connecting threaded sleeve (308) is provided with a second through hole coaxial with the flow channel (201). The valve core (304) passes through the second through hole, and one end of the valve core (304) is provided with an annular boss (3041). The end face of the annular boss (3041) abuts against the inner sidewall of the connecting threaded sleeve (308).

3. The decoupled fluid self-sealing relief valve according to claim 2, characterized in that, The valve core (304) is cone-shaped at one end near the flow channel (201), and the end of the flow channel (201) is provided with a conical surface that is adapted to the valve core (304).

4. The decoupled fluid self-sealing relief valve according to any one of claims 1-3, characterized in that, The pressure regulating module (4) further includes: a first guide seat (402) disposed at one end of the second elastic element (401), the first guide seat (402) being slidably connected to the inner wall of the second cavity (102), a first pressure cap (404) being disposed at the first end of the valve body (1), the first pressure cap (404) being threadedly connected to an adjusting bolt (405), and one end of the adjusting bolt (405) abutting against the first guide seat (402).

5. The decoupled fluid self-sealing relief valve according to claim 4, characterized in that, The other end of the second elastic member (401) is provided with a second guide seat (403), the second guide seat (403) is slidably connected to the inner wall of the second cavity (102), and a docking groove (4031) is provided on one side of the second guide seat (403), and the first end of the valve stem (301) abuts against the docking groove (4031).

6. The decoupled fluid self-sealing relief valve according to claim 4, characterized in that, The outer peripheral side of the adjusting bolt (405) is threadedly connected to the locking nut (406), and one side of the locking nut (406) abuts against the end face of the first pressure cap (404).

7. The decoupled fluid self-sealing relief valve according to claim 4, characterized in that, A dust cover (5) is provided at one end of the first pressure cap (404), and the dust cover (5) is placed on the outside of the adjusting bolt (405).

8. The decoupled fluid self-sealing relief valve according to any one of claims 1-3, characterized in that, The valve body (1) is provided with a second pressure cap (6) at its second end, and the second pressure cap (6) abuts against the sealing seat (2).

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