A one-way valve and feeding pump for metallurgical chemical equipment

Abstract

The utility model provides a one-way valve and feeding pump for metallurgical chemical industry equipment, wherein the one-way valve includes the casing, valve seat and valve core, and sets up throttling seal assembly on valve seat, throttling seal assembly includes throttling seal ring and sets up first buffer in throttling seal ring bottom, valve core has first inclined sealing surface, valve seat has second inclined sealing surface with first inclined sealing surface matched, the top of throttling seal ring has third inclined sealing surface with first inclined sealing surface matched, throttling seal ring is retractable through first buffer and sets up at second inclined sealing surface, is used for operable sealing contact first inclined sealing surface to realize pressure reduction throttling to flowing medium, each guide bridge of valve seat is equipped with buffer structure respectively, is used for operable contact valve core lower surface to absorb the impact force when valve is closed, the utility model can effectively improve the service life of one-way valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a check valve and a feed pump for metallurgical and chemical equipment. Background Technology

[0002] Existing high-pressure differential feed pumps use check valves, especially in metallurgical and chemical industries. The high pressure differential and the resulting high impact force cause wear, deformation, fatigue, pitting, and peeling on the valve core and seat sealing surfaces. Frequent valve opening and closing further exacerbates this, easily leading to localized damage to the valve core and seat sealing surfaces. The rebound and vibration of the valve core upon closure, along with the high-pressure differential medium creating localized high velocities in the valve sealing gap, cause flashing and cavitation. This intense erosion results in a very short lifespan for the check valve and high subsequent maintenance and replacement costs.

[0003] Therefore, there is an urgent need for a check valve and feed pump for metallurgical and chemical equipment that can effectively improve the service life of the check valve. Summary of the Invention

[0004] The purpose of this invention is to provide a check valve and a feed pump for metallurgical and chemical equipment, aiming to solve the technical problem of the short service life of traditional check valves in high pressure differential feed pumps.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a one-way valve for metallurgical and chemical equipment, comprising a housing, a valve seat disposed within the housing, a valve core matched with the valve seat, and a throttling sealing assembly disposed on the valve seat; The throttling sealing assembly includes a throttling sealing ring and a first buffer element disposed at the bottom of the throttling sealing ring; The valve core has a first inclined sealing surface, and the valve seat has a second inclined sealing surface that matches the first inclined sealing surface; both the first inclined sealing surface and the second inclined sealing surface are inclined relative to the axial centerline of the one-way valve. The top of the throttling sealing ring has a third inclined sealing surface that matches the first inclined sealing surface; The throttling sealing ring is telescopically disposed at the second inclined sealing surface via the first buffer member, and is used to operably seal and contact the first inclined sealing surface to achieve pressure throttling of the flowing medium; Each guide bridge of the valve seat is provided with a buffer structure for operably contacting the lower surface of the valve core to absorb the impact force when the valve is closed.

[0006] As a further improvement to the above solution, the buffer structure includes a buffer block and a second buffer member disposed at the bottom of the buffer block. The top of the buffer block has a contact surface that matches the lower surface of the valve core. The buffer block is telescopically disposed on the guide bridge via the second buffer member.

[0007] As a further improvement to the above solution, the buffer block includes a buffer block body and first lugs disposed on both sides of the bottom of the buffer block body; Correspondingly, the upper surface of the guide bridge is provided with a first limiting part that matches the two first lugs, and the two first limiting parts and the upper surface of the guide bridge form a convex groove for the buffer block to be installed; preferably, baffles can also be detachably provided on both sides of the guide bridge to prevent the buffer block from slipping out of the convex groove.

[0008] As a further improvement to the above solution, a step is recessed on the second inclined sealing surface toward the upper surface of the guide bridge for installing the throttling sealing assembly; The throttling sealing ring includes a throttling sealing ring body, and a second lug is provided on the side of the throttling sealing ring body adjacent to the buffer block; a second limiting part matching the second lug is provided on the corresponding side of the buffer block, so that the throttling sealing ring is installed on the step.

[0009] As a further improvement to the above solution, the throttling sealing ring and / or the buffer block are provided with a displacement detection device to monitor the movement of the throttling sealing ring in real time, so as to analyze the inertial force when the valve core and valve seat are closed.

[0010] As a further improvement to the above solution, a sealing buffer structure is provided on the first inclined sealing surface. The sealing buffer structure includes a third buffer element and a buffer sealing ring. The buffer sealing ring can move up and down to contact the third buffer element to absorb the impact force when the valve is closed.

[0011] As a further improvement to the above solution, the first buffer, the second buffer, and the third buffer are all metal elastic elements; preferably, each buffer is a disc spring or a spring, which is used in environments with relatively high temperatures.

[0012] As a further improvement to the above solution, the valve core includes a valve core body, an upper guide rod extending from the top of the valve core body, and a lower guide rod extending from the bottom of the valve core body; the first inclined sealing surface is disposed on the valve core body, and the buffer block contacts the lower surface of the valve core body; The valve seat includes a valve seat body and a guide sleeve through which the lower guide rod can slide, and the guide sleeve and the inner wall of the valve seat body are connected as one piece by a number of guide bridges.

[0013] As a further improvement to the above solution, a return spring is also sleeved on the upper guide rod. The first end of the return spring touches the top surface of the valve core body, and the other end touches the end cap of the housing.

[0014] Secondly, this utility model also provides a feed pump, including a pump body and a one-way valve for metallurgical and chemical equipment as described in the first aspect, disposed on the pump body.

[0015] Because this utility model adopts the above technical solutions, the beneficial effects of this application are as follows: This utility model provides a one-way valve for metallurgical and chemical equipment. A throttling sealing assembly is provided on the valve seat. The throttling sealing ring forms a multi-stage inclined sealing interface through the matching of its top third inclined sealing surface with the first inclined sealing surface of the valve core, and the matching of the second inclined sealing surface of the valve seat with the first inclined sealing surface of the valve core. When the medium flows in the forward direction, as the medium flows through the gap between the throttling sealing ring and the valve seat, it is guided by the multi-stage inclined sealing surfaces (inclined surface of the valve core → inclined surface of the throttling ring → inclined surface of the valve seat). The medium flow channel is forcibly contracted and then expanded, forming... Pressure gradient distribution: When the medium in the high-pressure zone passes through the tiny gap between the throttling ring and the valve seat, the flow velocity increases and the static pressure decreases (throttling effect), thereby converting part of the medium's pressure energy into kinetic energy. At the same time, the throttling sealing ring, through the expandable and adjustable first buffer, can dynamically match the medium pressure under different operating conditions and actively adjust the size of the sealing gap to achieve staged throttling and pressure reduction. This effectively reduces the medium impact pressure directly borne by the valve seat and valve core sealing surfaces, avoids instantaneous high-pressure erosion of the sealing surface by the high-pressure medium, significantly extends the wear cycle of the sealing pair, and thus improves the lifespan of this check valve. The buffer structure set on the guide bridge of the valve seat forms an energy absorption zone with the contact area of ​​the lower surface of the valve core. When the valve is closed, the valve core moves rapidly towards the valve seat under the reverse pressure of the medium or the action of the drive mechanism. At the moment its lower surface contacts the buffer structure of the guide bridge, the buffer structure absorbs most of the impact kinetic energy through its own elastic deformation or plastic deformation, converting rigid collision into flexible deformation energy, effectively reducing the mechanical impact stress between the valve core and the guide bridge. At the same time, the throttling sealing ring, through the elastic support of the first buffer, can pre-establish an initial sealing preload before the valve core contacts the valve seat, ensuring that even if the valve core has a slight displacement deviation due to impact, the throttling sealing ring can still maintain a tight fit with the sealing surface of the valve core and valve seat through elastic deformation, avoiding sealing failure (such as leakage or local crushing) caused by impact. The two work together to protect the metal parts inside the valve from impact damage and ensure the sealing reliability in the closed state. Specifically, when the valve core rapidly closes to the valve seat, the throttling sealing ring on the valve seat first contacts the valve core, followed by the buffer sealing ring contacting the valve seat, then the lower surface of the valve core contacts the buffer block, and finally the first and second inclined sealing surfaces contact each other. The throttling sealing ring forms a first-stage throttling seal when it contacts the valve core, the buffer sealing ring forms a second-stage throttling seal when it contacts the valve seat, and the first and second inclined sealing surfaces form a third-stage throttling seal when they contact each other, thus enabling a three-stage pressure-reducing seal between the valve core and the valve seat. Especially when the valve core impacts the valve seat, causing rebound vibration, both the throttling sealing ring and the buffer sealing ring, due to their respective buffer components, rebound, ensuring that the gaps between the throttling sealing ring and the valve core, and between the buffer sealing ring and the valve seat, are sufficiently small, reducing the flow velocity of the high-pressure differential medium and thus protecting the sealing channel between the valve core and the valve seat. Both the throttling sealing ring and the buffer sealing ring have a certain degree of independent self-aligning capability, which is beneficial for forming independent seals, realizing multi-stage sealing, multi-stage pressure reduction, and multi-stage self-aligning of this check valve, thereby improving its lifespan. During the closing process of this one-way valve, the buffer structure of the valve seat guide bridge bears the main impact of the valve core on the valve seat and assists in the stable alignment between the first and second inclined sealing surfaces (especially when the upper and lower guide structures of the valve core are severely worn), effectively separating the sealing function and the impact absorption function between the valve core and the valve seat of the one-way valve. Due to the buffer structure, the pressure design of the valve core can be reduced, and the weight of the valve core can also be lightened, which is very beneficial in reducing the impact force when the valve closes. Because the impact force on the sealing surface is small, problems such as fatigue, deformation, and wear of the sealing surface are effectively solved, and the throttling sealing ring is unobstructed. The retractable design of the first buffer element at the second inclined sealing surface of the valve seat allows the throttling sealing ring to be independently disassembled and replaced (without disassembling the entire valve). The modular installation of the guide bridge buffer structure (such as snap-fit ​​or bolt fixing) also facilitates individual adjustment or replacement during later maintenance without changing the entire check valve. Compared with the traditional method of replacing the entire check valve, this can greatly reduce subsequent replacement and maintenance costs. This feature significantly reduces the difficulty and cost of equipment maintenance, especially in harsh working conditions such as metallurgy and chemical industry (such as high temperature and corrosive media), which can effectively reduce downtime caused by frequent replacement of seals and improve production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1This is a cross-sectional schematic diagram of a one-way valve (equipped with a sealing buffer structure, in the forward flow open state) for metallurgical and chemical equipment disclosed in this utility model. Figure 2 This is a cross-sectional schematic diagram of a one-way valve for metallurgical and chemical equipment disclosed in this utility model, in which the valve core and valve seat are closed (with a sealing buffer structure, in the reverse cut-off closed state). Figure 3 This is a top view schematic diagram of a valve seat disclosed in this utility model; Figure 4 This is a cross-sectional schematic diagram of a one-way valve for metallurgical and chemical equipment disclosed in this utility model, showing the valve core and valve seat closed (with a displacement detection device, in the reverse cut-off closed state). Figure 5 This is a cross-sectional schematic diagram of the valve core and valve seat of a one-way valve for metallurgical and chemical equipment disclosed in this utility model when closed (reverse shut-off state); Figure 6 This is a partially enlarged schematic diagram of the throttling sealing assembly and buffer structure disclosed in this utility model disposed on the valve seat; Figure 7 This is a cross-sectional view of a one-way valve for metallurgical and chemical equipment disclosed in this utility model, when the valve core and valve seat are closed (the throttling sealing assembly is set on the second inclined sealing surface and is provided with a sealing buffer structure, in the reverse cut-off closed state).

[0018] Figure label: 1. Housing; 2. Valve seat; 21. Second inclined sealing surface; 211. Step; 22. Guide bridge; 23. First limiting part; 24. Guide sleeve; 3. Valve core; 31. First inclined sealing surface; 32. Upper guide rod; 33. Lower guide rod; 4. Throttling sealing assembly; 41. Throttling sealing ring; 411. Throttling sealing ring body; 412. Second lug; 413. Third inclined sealing surface; 42. First buffer element; 5. Buffer structure; 51. Buffer block; 511. Buffer block body; 512. First lug; 513. Second limiting part; 52. Second buffer component; 6. Displacement detection device; 7. Sealed buffer structure; 71. Third buffer component; 72. Buffer sealing ring; 8. Return spring.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0021] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0023] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model. Example

[0024] See Figures 1-6 In the field of chemical equipment, especially in high-pressure acid leaching processes (98% concentrated sulfuric acid and laterite ore slurry react at 5 MPa and 240°C to produce nickel hydroxide and cobalt hydroxide products), the check valve in the feed pump of the high-pressure acid leaching autoclave opens frequently (on average once every 2 seconds) and must withstand high pressure differentials and high slurry temperatures. Therefore, traditional check valves have a very short lifespan, resulting in high replacement and maintenance costs. Based on this inventive motivation, this utility model provides a check valve for metallurgical and chemical equipment. See [link to invention]. Figure 1 , Figure 3 , Figure 5 and Figure 6 It includes a housing 1, a valve seat 2 disposed within the housing 1, a valve core 3 matched with the valve seat 2, and a throttling sealing assembly 4 disposed on the valve seat 2; Specifically, the valve core 3 includes a valve core 3 body, an upper guide rod 32 extending from the top of the valve core 3 body, and a lower guide rod 33 extending from the bottom of the valve core 3 body; the first inclined sealing surface 31 is disposed on the valve core 3 body, and the buffer block 51 contacts the lower surface of the valve core 3 body. The valve seat 2 includes a valve seat 2 body and a guide sleeve 24 through which the lower guide rod 33 can slide. The guide sleeve 24 and the inner wall of the valve seat 2 body are connected as one unit by a number of guide bridges 22. A return spring 8 is also sleeved on the upper guide rod 32. The first end of the return spring 8 touches the top surface of the valve core 3 body, and the other end touches the end cap of the housing 1. The throttling sealing assembly 4 includes a throttling sealing ring 41 and a first buffer member 42 disposed at the bottom of the throttling sealing ring 41; The valve core 3 body has a first inclined sealing surface 31, and the valve seat 2 body has a second inclined sealing surface 21 that matches the first inclined sealing surface 31; both the first inclined sealing surface 31 and the second inclined sealing surface 21 are inclined relative to the axial centerline of the one-way valve. The top of the throttling sealing ring 41 has a third inclined sealing surface 413 that matches the first inclined sealing surface 31; The throttling sealing ring 41 is telescopically disposed at the second inclined sealing surface 21 via the first buffer 42, and is used to operably seal and contact the first inclined sealing surface 31 to achieve pressure throttling of the flowing medium. Each guide bridge 22 of the valve seat 2 is provided with a buffer structure 5, which is used to operably contact the lower surface of the valve core 3 to absorb the impact force when the valve is closed. Specifically, when the valve core 3 quickly closes to the valve seat 2, the throttling sealing ring 41 on the valve seat 2 first contacts the valve core 3, then the buffer sealing ring 72 contacts the valve seat 2, followed by the lower surface of the valve core 3 contacting the buffer block 51, and finally the first inclined sealing surface 31 and the second inclined sealing surface 21 contacting each other. The throttling sealing ring 41 forms a first-stage throttling seal when it contacts the valve core 3, the buffer sealing ring 72 forms a second-stage throttling seal when it contacts the valve seat 2, and the first inclined sealing surface 31 and the second inclined sealing surface 21 form a third-stage throttling seal when they contact each other. This allows a three-stage pressure-reducing seal to be formed between the valve core 3 and the valve seat 2. The valve is sealed; especially when the valve core 3 impacts the valve seat 2 and causes rebound vibration, the throttling sealing ring 41 and the buffer sealing ring 72 rebound because they each have buffer components. This makes the gap between the throttling sealing ring 41 and the valve core 3, and between the buffer sealing ring 72 and the valve seat 2, small enough to reduce the flow velocity of the high pressure differential medium, thereby protecting the sealing channel between the valve core 3 and the valve seat 2. The throttling sealing ring 41 and the buffer sealing ring 72 both have a certain degree of independent self-aligning capability, which is conducive to forming independent seals. This enables the check valve to achieve multi-stage sealing, multi-stage pressure reduction, and multi-stage self-aligning, thereby improving the life of the check valve. During the closing process of this one-way valve, the buffer structure 5 of the guide bridge 22 of the valve seat 2 bears the main impact of the valve core 3 on the valve seat 2, and assists in the stable alignment between the first inclined sealing surface 31 and the second inclined sealing surface 21 (especially when the upper and lower guide structures of the valve core 3 are severely worn), thus effectively separating the sealing function and the impact absorption function between the valve core 3 and the valve seat 2 of the one-way valve. Due to the buffer structure 5, the pressure design of the valve core 3 can be reduced, and the weight of the valve core 3 can also be reduced, which is very beneficial in reducing the impact force when the valve is closed. Because the impact force on the sealing surface is small, problems such as fatigue, deformation, and wear of the sealing surface are effectively solved, and the throttling seal is also improved. The throttling sealing ring 41 is telescopically mounted on the second inclined sealing surface 21 of the valve seat 2 via the first buffer 42, allowing the throttling sealing ring 41 to be independently disassembled and replaced (without disassembling the entire valve). The modular installation of the guide bridge 22 buffer structure 5 (such as snap-fit ​​or bolt fixing) also facilitates individual adjustment or replacement during later maintenance without changing the entire check valve. Compared with the traditional replacement of the entire check valve, this can greatly reduce subsequent replacement and maintenance costs. This feature significantly reduces the difficulty and cost of equipment maintenance, especially in harsh working conditions such as metallurgy and chemical industry (such as high temperature and corrosive media), which can effectively reduce downtime caused by frequent replacement of seals and improve production efficiency.

[0025] As a preferred embodiment, see Figure 6 The buffer structure 5 is mainly used at the connection between the valve seat 2 and the valve core 3 body, specifically including a buffer block 51 and a second buffer member 52; wherein, the top of the buffer block 51 is machined with a contact surface that perfectly matches the shape of the lower surface of the valve core 3 body. The contact surface can achieve high-precision fit through machining or forming process to ensure the fit between the buffer block 51 and the valve core 3 body when in contact; the buffer block 51 is telescopically mounted on the guide bridge 22 through the second buffer member 52. "Telescopic" means that the buffer block 51 can move back and forth in the axial direction of the guide bridge 22 (usually the direction of movement of the valve core 3). The second buffer member 52 is preferably an elastic element (such as a spring), with its two ends abutting against the bottom of the buffer block 51 and the upper surface of the guide bridge 22 respectively, providing elastic resistance for the telescopic movement of the buffer block 51, thereby absorbing the impact energy when the valve core 3 moves; Furthermore, in this embodiment, see Figure 3 The valve seat 2 is provided with three guide bridges 22, which are evenly distributed along the circumference of the valve seat 2 (or non-uniformly distributed according to actual force requirements). The upper surface of each guide bridge 22 is independently provided with the buffer structure 5. The layout of multiple guide bridges 22 can effectively disperse the impact force generated when the valve core 3 moves, avoid structural failure of a single guide bridge 22 due to excessive local force, and improve the overall buffer reliability. The specific structure of the buffer block 51 includes a buffer block body 511 and two first lugs 512. The two first lugs 512 are symmetrically arranged on both sides of the bottom of the buffer block body 511, and their extension direction is perpendicular to the movement direction (axial direction) of the buffer block 51. Correspondingly, the upper surface of each guide bridge 22 is machined with two first limiting parts 23 that are completely matched with the shape and size of the first lugs 512. The two first limiting parts 23 are spaced apart along the length direction (lateral direction) of the guide bridge 22, and the two together with the upper surface of the guide bridge 22 form a convex groove. The buffer block 51 is embedded in the convex groove of the guide bridge 22 through the two first lugs 512 at its bottom, realizing the lateral positioning of the buffer block 51 on the guide bridge 22, preventing the buffer block 51 from shifting laterally during movement, and ensuring the precise alignment of the contact surface with the lower surface of the valve core 3 body. To further improve the stability of the buffer block 51 installation and prevent it from slipping out of the convex groove due to vibration or accidental collision, this embodiment adds detachable baffles to both sides of the guide bridge 22 (i.e., the opening side of the convex groove). The baffles are connected to the sides of the guide bridge 22 by means of threaded connection, snap-fit ​​connection or pin fixation, etc., and cover the opening area of ​​the convex groove, thereby limiting the buffer block 51 in the lateral direction. When it is necessary to replace or maintain the buffer block 51 and the second buffer component 52, the buffer block 51 can be removed from the convex groove simply by removing the baffles, which is convenient and has low maintenance cost. The first lug 512 at the bottom of the buffer block 51 cooperates with the first limiting part 23 on the guide bridge 22 to form a convex groove. The groove structure provides lateral limiting for the buffer block 51, ensuring that the buffer block 51 always extends and contracts axially during movement. This prevents misalignment of the contact surface or buffer failure caused by lateral offset, significantly improving the movement accuracy of the buffer structure 5. The structure design of three guide bridges 22 on the valve seat 2 disperses the impact force generated when the valve core 3 moves to multiple buffer structures 5, avoiding fatigue damage or deformation of a single guide bridge 22 due to concentrated force, extending the service life of the buffer structure 5, and improving the reliability of the overall system. The buffer block 51 is telescopically mounted on the guide bridge 22 through the second buffer element 52. It absorbs the impact energy by utilizing the buffering characteristics of the elastic element. Combined with the guiding effect of the rigid structure (buffer block 51, guide bridge 22), it achieves a buffering effect that combines rigidity and flexibility, effectively reducing the impact force when the valve core 3 moves.

[0026] As a preferred embodiment, see Figure 6 On the second inclined sealing surface 21, a step 211 is recessed towards the upper surface of the guide bridge 22 for installing the throttling sealing assembly 4; The throttling sealing ring 41 includes a throttling sealing ring body 411, and a second lug 412 is provided on the side of the throttling sealing ring body 411 adjacent to the buffer block 51; a second limiting part 513 matching the second lug 412 is provided on the corresponding side of the buffer block 51, so that the throttling sealing ring 41 is installed on the step 211.

[0027] The valve core 3 assembly has a step 211 structure recessed on the second inclined sealing surface 21 in the direction toward the upper surface of the guide bridge 22. The step 211 provides a dedicated installation space for the throttling sealing assembly 4. The recessed depth and horizontal extension range of the step 211 can effectively limit the installation position and axial and radial range of motion of the throttling sealing ring 41, and prevent the sealing ring from shifting due to assembly errors or operating vibrations. The throttling sealing ring 41, as the core component of the throttling sealing assembly 4, has a ring-shaped structure and can be made of wear-resistant metal or polymer composite material to meet the scouring and sealing requirements of the medium fluid. To further facilitate the installation and fixing of the throttling sealing ring 41, a second lug 412 is provided on the side of the throttling sealing ring body 411 adjacent to the buffer block 51 (i.e., the annular side facing the buffer block 51). The second lug 412 is a protruding structure extending radially along the throttling sealing ring 41, and its size and shape must precisely match the limiting structure at the corresponding position of the buffer block 51. Correspondingly, the buffer block 51 has a second limiting part 513 on the side adjacent to the second inclined sealing surface 21 (i.e., the side opposite to the second lug 412 of the throttling sealing ring 41); the second limiting part 513 can be a notch structure that matches the protrusion structure, and its function is to form a snap-fit ​​with the second lug 412 of the throttling sealing ring 41; when the throttling sealing ring 41 is installed on the step 211 of the second inclined sealing surface 21, its second lug 412 is embedded in the second limiting part 513 of the buffer block 51. Through the geometric constraint of the two, the freedom of the throttling sealing ring 41 in the axial direction (movement direction of the valve core 3) can be restricted, ensuring the fitting accuracy between the sealing ring and the inclined sealing surface; In the specific assembly process, the throttling sealing ring 41 is first placed on the step 211 of the second inclined sealing surface 21, aligning its center with the center of the step 211; then the position of the buffer block 51 is adjusted so that its second limiting part 513 is aligned with the second lug 412 of the throttling sealing ring 41; finally, through the elastic cooperation (such as spring compression) between the buffer block 51 and the second buffer member 52, the second lug 412 of the throttling sealing ring 41 is pressed into the second limiting part 513 of the buffer block 51, thus completing the fixing of the sealing ring; through the dual constraint of "step 211 positioning + lug limiting", the installation accuracy of the throttling sealing ring 41 is ensured, and the sealing ring is prevented from falling off or misaligning due to external impact.

[0028] The second lug 412 of the throttling sealing ring 41 and the second limiting part 513 of the buffer block 51 form a "convex-concave" mating structure. Through complementary geometric constraints, the sealing ring can be dually positioned in both the radial and axial directions. Compared with the traditional assembly method that relies solely on end face contact, this effectively reduces the installation error of the sealing ring, ensures the fit between the sealing surface and the inclined sealing surface, and improves the initial sealing performance. When the throttling sealing ring 41 needs to be replaced or repaired, it can be quickly removed simply by disassembling the corresponding buffer structure 5. Compared to the traditional method of disassembling the entire check valve, this significantly shortens maintenance time and reduces maintenance costs.

[0029] As a preferred embodiment, see Figure 4 The throttling sealing ring 41 and / or the buffer block 51 are provided with a displacement detection device 6, which is used to monitor the movement of the throttling sealing ring 41 in real time so as to analyze the inertial force when the valve core 3 and the valve seat 2 are closed. Specifically, the displacement detection device 6 includes an eddy current shaft displacement sensor and a sensing plate. Since the heights of the throttling sealing ring 41 and the buffer block 51 are constant when they are not fully rebounded by the valve core 3, the eddy current shaft displacement sensor can measure the up and down displacement waveforms of the throttling sealing ring 41 and the buffer block 51 in real time during compression or rebound, thereby calculating the change in inertial force of the valve core 3. At the same time, the working status of the throttling sealing ring 41 assembly or the buffer structure 5 can be understood based on the normal operation waveform and the abnormal waveform.

[0030] It should be noted that the displacement detection device 6 can be flexibly selected and combined for installation. For example, the displacement detection device 6 can be installed on only one of the components of the throttling sealing ring 41 or the buffer block 51, or the displacement detection device 6 can be installed on both the throttling sealing ring 41 and the buffer block 51.

[0031] As a preferred embodiment, see Figure 1 and Figure 2 The first inclined sealing surface 31 is provided with a sealing buffer structure 7, which includes a third buffer member 71 and a buffer sealing ring 72. The buffer sealing ring 72 can move up and down to contact the third buffer member 71 to absorb the impact force when the valve is closed; in some embodiments, see Figure 7 The throttling sealing assembly 4 is disposed on the second inclined sealing surface 21. In the closed state, the throttling sealing assembly 4 is adjacent to the sealing buffer structure 7 and is staggered with the sealing buffer structure 7; thus, this one-way valve forms a three-stage pressure reducing seal.

[0032] In a preferred embodiment, the first buffer 42, the second buffer 52, and the third buffer 71 are all metal elastic elements; preferably, each buffer is a disc spring or spring, which is used in environments with relatively high temperatures.

[0033] In a preferred embodiment, the throttling sealing ring 41 is made of a high-strength alloy, and each sealing surface (first inclined sealing surface 31, second inclined sealing surface 21, and second inclined sealing surface 21) is hardened with a cobalt-based alloy of No. 6. The hardening treatment can improve the erosion resistance and impact resistance of each sealing surface, and can further improve the service life of this one-way valve. Example

[0034] This utility model also provides a feed pump, including a pump body and a one-way valve for metallurgical and chemical equipment as described in Embodiment 1, which is disposed on the pump body; the one-way valve enables the feed pump to operate smoothly, reduces downtime for maintenance, and thus improves production efficiency.

[0035] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A check valve for use in metallurgical and chemical equipment, characterized in that, It includes a housing, a valve seat disposed within the housing, a valve core mating with the valve seat, and a throttling sealing assembly disposed on the valve seat; The throttling sealing assembly includes a throttling sealing ring and a first buffer element disposed at the bottom of the throttling sealing ring; The valve core has a first inclined sealing surface, and the valve seat has a second inclined sealing surface that matches the first inclined sealing surface; both the first inclined sealing surface and the second inclined sealing surface are inclined relative to the axial centerline of the one-way valve. The top of the throttling sealing ring has a third inclined sealing surface that matches the first inclined sealing surface; The throttling sealing ring is telescopically disposed at the second inclined sealing surface via the first buffer member, and is used to operably seal and contact the first inclined sealing surface to achieve pressure throttling of the flowing medium; Each guide bridge of the valve seat is provided with a buffer structure for operably contacting the lower surface of the valve core to absorb the impact force when the valve is closed.

2. The one-way valve for metallurgical and chemical equipment according to claim 1, characterized in that, The buffer structure includes a buffer block and a second buffer member disposed at the bottom of the buffer block. The top of the buffer block has a contact surface that matches the lower surface of the valve core. The buffer block is telescopically disposed on the guide bridge via the second buffer member.

3. A check valve for metallurgical and chemical equipment according to claim 2, characterized in that, The buffer block includes a buffer block body and first lugs disposed on both sides of the bottom of the buffer block body; Correspondingly, the upper surface of the guide bridge is provided with a first limiting part that matches the two first lugs, and the two first limiting parts and the upper surface of the guide bridge form a convex groove for the buffer block to be installed.

4. A check valve for metallurgical and chemical equipment according to claim 3, characterized in that, On the second inclined sealing surface, a step is recessed towards the upper surface of the guide bridge to facilitate the installation of the throttling sealing assembly; The throttling sealing ring includes a throttling sealing ring body, and a second lug is provided on the side of the throttling sealing ring body adjacent to the buffer block; The buffer block is provided with a second limiting part on the corresponding side that matches the second lug, so that the throttling sealing ring is installed on the step.

5. A check valve for metallurgical and chemical equipment according to any one of claims 2-4, characterized in that, The throttling sealing ring and / or the buffer block are equipped with a displacement detection device for real-time monitoring of the movement of the throttling sealing ring, so as to analyze the inertial force when the valve core and valve seat are closed.

6. A check valve for metallurgical and chemical equipment according to claim 2, characterized in that, The first inclined sealing surface is also provided with a sealing buffer structure, which includes a third buffer element and a buffer sealing ring. The buffer sealing ring can move up and down to contact the third buffer element to absorb the impact force when the valve is closed.

7. A check valve for metallurgical and chemical equipment according to claim 6, characterized in that, The first buffer, the second buffer, and the third buffer are all metallic elastic elements.

8. A feed pump, characterized in that, It includes a pump body and a one-way valve for metallurgical and chemical equipment as described in any one of claims 1-7, which is disposed on the pump body.

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