One-way valve and feeding pump for metallurgical chemical equipment
By adopting sealing buffer structure and rolling guide structure in the check valves for metallurgical and chemical equipment, the problem of low life of traditional check valves is solved, and a longer service life and lower maintenance costs are achieved.
Patent Information
- Application Number
- CN202510084644.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-05-23
AI Technical Summary
The one-way valve used in traditional high-pressure differential feed pumps has a low life, which is prone to local high flow velocity due to rebound and offset of the sealing surface, causing flash evaporation or cavitation, causing severe erosion, and thus shortening the service life of the valve.
A check valve for metallurgical chemical equipment is designed, and a sealing buffer structure is adopted, including a buffer member and a sealing ring. The sealing ring can move up and down to absorb impact force and reduce friction through the rolling guide structure.
Through the multi-stage sealing and rolling guide structure, the direct effect of impact forces on the valve core is significantly reduced, the service life of the check valve is extended, and the cost of maintenance and replacement is reduced.
Smart Images
Figure CN120027245A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of valve technology, and in particular to a one-way valve and a feed pump for metallurgical and chemical equipment. Background Art
[0002] The check valve used in the high-pressure differential feed pump has a return spring installed on the valve core. The valve core is pushed open by the medium pressure difference, and then quickly closed by the medium pressure difference and the return spring. At the moment when the valve core is closed, the impact force of the valve core on the valve seat is very large, and the valve core will rebound. The valve is frequently opened and closed, which can easily cause local damage to the valve core and the sealing surface of the valve seat; the radial guide of the valve core becomes worse after the valve core guide structure is worn, and the fit at the sealing surface is prone to offset when the valve core is closed. The rebound of the valve core and the offset of the sealing surface fit make it easy for the valve to form a local high flow rate under high-pressure differential media, resulting in flash or cavitation. The strong erosion leads to a very short life of the check valve (according to incomplete statistics, the life of the GEHO check valve of the British Weir Minerals Company used in the autoclave feed pump of the laterite high-pressure acid leaching device is only 3 days to 27 days), and the subsequent maintenance and replacement costs are very high.
[0003] Traditionally, in order to solve this problem, a Chinese patent application with application number 2017102015518 discloses a method for increasing the life of a one-way valve in a high-pressure autoclave in high-pressure leaching of laterite nickel ore. The patent proposes adding alkali to the slurry of the laterite nickel ore for mixing, so that the slurry is neutral when passing through the one-way valve, thereby improving the use environment of the one-way valve, thereby increasing the life of the one-way valve; however, actual operation shows that the life of the one-way valve is still not high enough by only improving the use environment, and the one-way valve is frequently replaced every year, and the replacement cost is also very high.
[0004] Therefore, there is an urgent need for a one-way valve and a feed pump for metallurgical and chemical equipment, which can effectively improve the service life of the one-way valve. Summary of the invention
[0005] The object of the present invention is to provide a one-way valve and a feed pump for metallurgical and chemical equipment, aiming to solve the technical problem of short service life of a conventional one-way valve in a high-pressure differential feed pump.
[0006] To achieve the above-mentioned object, in a first aspect, the present invention provides a one-way valve for metallurgical and chemical equipment, comprising a housing, a valve seat arranged in the housing, a valve core assembly matched with the valve seat, and a guide frame arranged on the top of the housing; The valve core assembly includes a valve core, an upper guide rod extends from the top of the valve core, and a lower guide rod extends from the bottom of the valve core; A sealing buffer structure is provided at the sealing joint between the valve core and the valve seat, and the sealing buffer structure includes a buffer and a sealing ring, and the sealing ring can move up and down to contact the buffer to absorb impact force; the outer walls of the valve core and the sealing ring respectively have a valve core sealing surface and a sealing ring sealing surface matching the valve seat; A rolling guide structure is provided in the middle of the valve seat, and the lower guide rod passes through the valve seat and is matched with the rolling guide structure; The rolling guide structure is provided in the middle of the guide frame, and the upper guide rod passes through the guide frame and is matched with the rolling guide structure.
[0007] As a further improvement of the above scheme, a groove is provided at the bottom of the valve core, the buffer component is embedded in the groove, the sealing ring is pressed and covered on the buffer component through a nut plate, and the sealing surface of the sealing ring and the sealing surface of the valve core sequentially constitute a combined sealing surface of the valve core.
[0008] As a further improvement of the above solution, a groove is provided at the sealing joint of the valve core, and at least one sealing ring is detachably provided in the groove; When one sealing ring is provided, the buffer member is arranged between the upper surface of the sealing ring and the groove; When two or more sealing rings are provided, the sealing rings are stacked from top to bottom, and the buffer is arranged between two adjacent sealing rings and / or between the upper surface of the sealing ring and the groove; Each sealing ring sealing surface and the valve core sealing surface sequentially form a valve core combined sealing surface.
[0009] As a further improvement of the above solution, the buffer is a metal elastic element. Preferably, the buffer is a disc spring or a spring, which is used in an environment with relatively high temperature.
[0010] As a further improvement of the above solution, the buffer is made of a non-metallic elastic material. Preferably, the buffer is made of fluororubber and is used in an environment with relatively low temperature.
[0011] As a further improvement of the above scheme, the buffer may also be made of a composite of non-metallic materials and metal elements. Preferably, the composite buffer comprises a non-metallic elastic pad and a metal elastic member embedded on the upper and lower surfaces of the non-metallic elastic pad. Preferably, the non-metallic elastic pad is made of a rubber material, and the metal elastic member is a disc spring or a spring.
[0012] As a further improvement of the above solution, a sealing ring is further provided between the sealing ring and the groove.
[0013] As a further improvement of the above scheme, the cross-sections of the upper guide rod and the lower guide rod are regular polygons. Preferably, the cross-sections are regular triangles, squares, regular pentagons or regular hexagons. Alternatively, the cross-sections of the upper guide rod and the lower guide rod are circular, and at least two guide planes are provided on the side surfaces of the upper guide rod and the lower guide rod.
[0014] As a further improvement of the above scheme, the rolling guide structure includes a guide hole for the upper guide rod or the lower guide rod to pass through (the valve seat and the middle part of the guide frame are both provided with the guide hole), and the cross section of the guide hole is matched with the cross section of the two guide rods; A compressible guide roller assembly is matched on each guide surface of the guide hole, so that the corresponding guide rod is in full contact with the compressible guide roller assembly and can absorb the impact force when the valve core moves up and down.
[0015] As a further improvement of the above scheme, the compressible guide roller assembly includes a rotating shaft and a roller rotatably arranged on the rotating shaft, and an elastic member for contacting the outer wall of the rotating shaft; The elastic member is arranged on the side of the rotating shaft away from the guide rod, and the outer edge of the roller exceeds the corresponding guide surface; preferably, the elastic member is made of one of Inconel alloy and fluororubber.
[0016] As a further improvement of the above scheme, the compressible guide roller assembly includes a rotating shaft, an elastic sleeve sleeved on the outer wall of the rotating shaft, and a roller rotatably arranged outside the elastic sleeve. Preferably, the elastic sleeve is made of elastic rubber material.
[0017] As a further improvement of the above solution, a return spring is also sleeved on the upper guide rod, a first end of the return spring contacts the valve core, and the other end contacts the inner wall of the guide frame.
[0018] As a further improvement of the above scheme, the material of the sealing ring is a high-strength alloy, and the sealing surface of the sealing ring is treated with tungsten carbide, and the valve core sealing surface of the valve core is hardened with No. 6 cobalt-based alloy; Correspondingly, the portion of the valve seat sealing surface of the valve seat that matches the sealing surface of the sealing ring is treated with tungsten carbide, and the portion that matches the valve core sealing surface is hardened with No. 6 cobalt-based alloy.
[0019] In a second aspect, the present invention further provides a feed pump, comprising a pump body and a one-way valve for metallurgical and chemical equipment as provided in the first aspect, which is arranged on the pump body.
[0020] Since the present invention adopts the above technical solutions, the beneficial effects of the present application are as follows: A check valve for metallurgical and chemical equipment provided by the present invention is provided with a sealing and buffering structure at the sealing joint of the valve core and the valve seat. The sealing and buffering structure includes a buffer member and a sealing ring. The sealing ring can move up and down to abut against the buffer member to absorb the impact force. The outer walls of the valve core and the sealing ring respectively have a valve core sealing surface and a sealing ring sealing surface that match the valve seat. The buffer member and the sealing ring are provided. When the valve core quickly closes towards the valve seat, the sealing ring on the valve core first contacts the valve seat to form a primary seal on the valve seat. When the valve core contacts the valve seat, a primary seal is formed again, so that a secondary seal can be formed between the valve core assembly and the valve seat. And because there is also a buffer member, when the sealing ring contacts the valve seat, the impact force between the valve core assembly and the valve seat is transmitted to the buffer member through the sealing ring for buffering and absorption, thereby greatly reducing the impact force directly acting on the valve core. At the same time, the sealing ring has a certain independent centering ability and forms a seal independently on the valve seat, realizing multi-stage sealing, multi-stage pressure reduction, and multi-stage centering of the check valve, so as to improve the service life of the check valve. Since the sealing ring and the buffer member are arranged in the groove, after being damaged, the sealing ring and / or the buffer member can be replaced separately without changing the entire check valve. Compared with the traditional replacement of the entire check valve, the subsequent replacement and maintenance costs can be greatly reduced (the single price of the traditional inlet check valve for the feed pump is about 100,000 US dollars, and due to its complex use environment, its service life is only about 3 to 27 days. In this way, the annual maintenance and replacement cost of the check valve for a single-series high-pressure acid leaching device alone is hundreds of millions of yuan; while using the check valve provided by the present invention, even if the service life is doubled, the equipment maintenance cost can be greatly reduced, and the production loss caused by the shutdown due to the replacement of the check valve can be reduced); In addition, in the present invention, guide rods respectively extend from the upper and lower ends of the valve core, and rolling guide structures are respectively provided on the valve seat and the guide frame, so that the reciprocating movement up and down between the valve core assembly and the valve seat and between the valve core assembly and the guide frame is changed from traditional sliding friction to rolling friction, thereby greatly reducing the friction force, making the reciprocating movement up and down of the valve core assembly smoother, and further effectively improving the service life of the check valve; In some preferred embodiments, the cross-sections of the upper guide rod and the lower guide rod are both regular polygons or are provided with at least two guide planes; the rolling guide structure includes a guide hole for the upper guide rod or the lower guide rod to pass through (the guide hole is provided in the middle of the valve seat and the guide frame), and the cross-section of the guide hole is matched with the cross-section of the two guide rods; a compressible guide roller assembly is matched on each guide surface of the guide hole, so that the corresponding guide rod is fully in contact with the compressible guide roller assembly and can absorb the impact force when the valve core moves up and down; the arrangement of the compressible guide roller assembly, when the valve core assembly and the valve seat or the guide frame are subjected to strong impact or strong unbalanced load, the compressible guide roller assembly can provide strong guidance and stable limiting for the upper guide rod and the lower guide rod, thereby protecting the rollers and ensuring the normal operation of the valve core assembly moving up and down; At the same time, the arrangement of the compressible guide roller assembly enables the roller of the compressible guide roller assembly to push against the upper guide rod and the lower guide rod under the action of its elastic member or elastic sleeve, thereby effectively buffering the impact of the guide rod on the roller, thereby increasing the service life of the one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0022] Figure 1 It is a cross-sectional schematic diagram of a one-way valve (with a primary sealing ring) for metallurgical and chemical equipment disclosed in the present invention; Figure 2 It is a cross-sectional schematic diagram of a one-way valve (with a secondary sealing ring) for metallurgical and chemical equipment disclosed in the present invention; Figure 3 It is a cross-sectional schematic diagram of the valve core assembly (with a secondary sealing ring) disclosed in the present invention; Figure 4 A cross-sectional view of the rolling guide structure disclosed in the present invention Figure 1 ; Figure 5 A cross-sectional view of the rolling guide structure disclosed in the present invention Figure 2 ; Figure 6 A cross-sectional view of the rolling guide structure disclosed in the present invention Figure 3 ; Figure 7It is a cross-sectional schematic diagram of the valve core assembly (with a primary sealing ring) disclosed in the present invention; Figure 8 for Figure 2 , Figure 3 , Figure 7 Schematic diagram of the top view of the sealing ring and the buffer member in the scheme Figure 1 ; Fig. 9 for Figure 2 , Figure 3 , Figure 7 Schematic diagram of the top view of the sealing ring and the buffer member in the scheme Figure 2 ; Reference numerals: 1. Shell; 2. Valve seat; 21. Valve seat sealing surface; 3. Valve core assembly; 31. Valve core; 31-1 Valve core sealing surface; 32. Upper guide rod; 321. Guide plane; 33. Lower guide rod; 34. Groove; 35. Buffer; 35-1. Upper buffer; 35-2. Lower buffer; 36. Sealing ring; 36-1. Primary sealing ring; 36-2. Secondary sealing ring; 36-3. Sealing ring sealing surface; 37. Sealing ring; 4. Guide frame; 5. Rolling guide structure; 51. Guide hole; 52. Compressible guide roller assembly; 521a. Rotating shaft; 522a. Roller; 523a. Elastic member; 521b. Rotating shaft; 522b. Roller; 523b. Elastic sleeve; 6. Return spring.
[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0025] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0026] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.
[0027] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0028] Example 1 See also Figure 1-Figure 9 In the field of chemical equipment, especially in the high-pressure acid leaching process (98% concentrated sulfuric acid and laterite ore slurry react at 5Mpa and 240° to produce nickel hydroxide and cobalt hydroxide products), the one-way valve in the high-pressure acid leaching autoclave feed pump is frequently opened (on average, it needs to be opened once in less than 2 seconds), and it must withstand the high pressure difference and the high temperature of the slurry. Therefore, the service life of the traditional one-way valve is very short, resulting in high subsequent replacement and maintenance costs. Based on such an invention motivation, the present invention provides a one-way valve for metallurgical and chemical equipment, including a shell 1, a valve seat 2 arranged in the shell 1 and a valve core assembly 3 matched with the valve seat 2, and a guide frame 4 arranged on the top of the shell 1; specifically, a medium inlet is provided on the shell 1, and the medium outlet is connected to the inner cavity of the valve seat 2, and a medium outlet is provided on the guide frame 4; The valve core assembly 3 includes a valve core 31, and an upper guide rod 32 extends from the top of the valve core 31, and a lower guide rod 33 extends from the bottom of the valve core 31; Specifically, in this embodiment, the valve seat 2 has a hollow inner cavity, and its bottom has a hollow structure, the top of the valve seat 2 has an opening, and an inclined valve seat sealing surface 21 is provided at the inner edge of the opening, and correspondingly, the outer side surface of the valve core 31 is provided with a valve core sealing surface matching the valve seat sealing surface 21; A sealing buffer structure is provided at the sealing joint between the valve core 31 and the valve seat 2, and the sealing buffer structure includes a buffer member 35 and a sealing ring 36. The sealing ring 36 can move up and down to contact the buffer member 35 to absorb impact force; the outer walls of the valve core 31 and the sealing ring 36 respectively have a valve core sealing surface 31-1 and a sealing ring sealing surface 36-3 matching the valve seat 2; The upper guide rod 32 is also sleeved with a return spring 6, a first end of the return spring 6 contacts the valve core 31, and the other end contacts the inner wall of the guide frame 4; A rolling guide structure 5 is provided in the middle of the valve seat 2, and the lower guide rod 33 passes through the valve seat 2 and is matched with the rolling guide structure 5; The rolling guide structure 5 is provided in the middle of the guide frame 4, and the upper guide rod 32 passes through the guide frame 4 and is matched with the rolling guide structure 5; In the present invention, the buffer 35 and the sealing ring 36 are arranged so that when the valve core is quickly closed to the valve seat 2, the sealing ring 36 on the valve core 31 first contacts the valve seat 2 to form a primary seal on the valve seat 2. When the valve core 31 contacts the valve seat 2, a primary seal is formed, so that a secondary seal can be formed between the valve core assembly 3 and the valve seat 2. In addition, since the buffer 35 is also provided, when the sealing ring 36 contacts the valve seat 2, the impact force between the valve core assembly 3 and the valve seat 2 is transmitted to the buffer 35 through the sealing ring 36 and absorbed by the buffer, thereby greatly reducing the impact force directly acting on the valve core 31. When the valve core 31 is quickly closed to the valve seat 2 and rebounds to form a vibration process, the sealing ring 36 and the valve seat 2 always maintain an effective seal, thereby avoiding high flow rate erosion of the sealing surface formed by the medium in the vibration gap. Even if the valve core 31 violently and frequently impacts the valve seat 2, resulting in damage to the valve seat sealing surface 21 or the valve core sealing surface 31-1, the sealing ring 36 ; at the same time, the sealing ring 36 has a certain independent self-adjusting ability, and independently forms a seal on the valve seat 2, so as to realize the multi-stage sealing, multi-stage pressure reduction and multi-stage self-adjusting of the one-way valve, thereby improving the service life of the one-way valve. Since the sealing ring 36 and the buffer member 35 are arranged in the groove 34, after damage, the sealing ring 36 and / or the buffer member 35 can be replaced separately, without changing the entire valve core assembly 3 and the valve seat 2, thereby reducing the subsequent replacement and maintenance costs (the traditional imported one-way valve used for the feed pump is sold at a price of about 100,000 US dollars, and due to its complex use environment, its service life is only about 3 days to 27 days. In this way, the maintenance and replacement costs of the one-way valve of a single series of high-pressure acid leaching devices are more than 100 million yuan per year; and the one-way valve provided by the present invention can greatly reduce the equipment maintenance cost even if the service life is doubled, and can reduce the production loss caused by the shutdown of the replacement of the one-way valve); In addition, in the present invention, guide rods are extended from the upper and lower ends of the valve core 31, and rolling guide structures 5 are correspondingly arranged on the valve seat 2 and the guide frame 4, so that the up and down reciprocating movement between the valve core assembly 3 and the valve seat 2 and between the valve core assembly 3 and the guide frame 4 is changed from traditional sliding friction to rolling friction, thereby greatly reducing the friction force, making the up and down reciprocating movement of the valve core assembly 3 smoother, and further effectively improving the life of the one-way valve.
[0029] As a preferred embodiment, see Figure 1The bottom of the valve core 31 is provided with a groove 34, the buffer member 35 is embedded in the groove 34, the sealing ring 36 is pressed and covered on the buffer member 35 through a nut plate, and the sealing surface 36-3 of the sealing ring and the valve core sealing surface 31-1 form a valve core combined sealing surface; During assembly, the buffer component 35 is first clamped in the groove 34, and then the sealing ring 36 is pressed onto the buffer component 35, and then the nut pressure plate and the lower guide rod 33 are tightened. After the valve core assembly 3 is assembled, the buffer component 35 is in a pre-compressed state; during operation, when the valve core assembly 3 is quickly closed under the action of the reset spring 6 and the medium pressure difference, the sealing surface 36-3 of the sealing ring first contacts the valve seat sealing surface 21 to form a primary seal and a primary pressure reduction. After the buffer component 35 is compressed, the valve core sealing surface 31-1 contacts the valve seat sealing surface 21 to form a secondary seal and a secondary pressure reduction. Since the sealing ring 36 adopts a movable structure relative to the valve core 31 and has a certain self-aligning ability, it is beneficial to improve the fit between the sealing surface 36-3 of the sealing ring and the valve seat sealing surface 21, and reduce the leakage rate after the valve is closed.
[0030] As a preferred embodiment, see Figure 2 and Figure 3 The sealing joint of the valve core 31 is provided with a groove 34, and at least one sealing ring 36 is detachably provided in the groove 34; When one sealing ring 36 is provided, see Figure 7 As shown, the buffer member 35 is disposed between the upper surface of the sealing ring 36 and the groove 34; in some embodiments, see Figure 8 , the buffer member 35 may be a plurality of disc springs or a plurality of springs, and the plurality of disc springs or springs are uniformly distributed around the valve core 31 in the circumferential direction between the upper surface of the sealing ring 36 and the groove 34; in some embodiments, see Fig. 9 The buffer member 35 may also be an annular elastic member, and the annular elastic member is concentrically arranged with the sealing ring 36; When two or more sealing rings 36 are provided, the sealing rings 36 are stacked from top to bottom, and the buffer member 35 is arranged between two adjacent sealing rings 36, and / or, between the upper surface of the sealing ring 36 and the groove 34; each sealing ring sealing surface 36-3 and the valve core sealing surface 31-1 sequentially form a valve core combined sealing surface; In this embodiment, see Figure 2 and Figure 3 , two sealing rings 36 are provided, namely, a primary sealing ring 36-1 and a secondary sealing ring 36-2, and buffers 35 are provided between the upper and lower surfaces of the secondary sealing ring 36-2, namely, an upper buffer 35-1 and a lower buffer 35-2; when the valve core 31 is quickly closed to the valve seat 2, there are the following two situations: The first case: during the closing process, the elastic force of the lower buffer 35-2 is less than the elastic force of the upper buffer 35-1 (preferably, the elastic force of the lower buffer 35-2 is 80-90% of the elastic force of the upper buffer 35-1); the elastic force of the upper buffer 35-1 is less than the elastic force of the return spring 6 (preferably, the elastic force of the upper buffer 35-1 is 80-90% of the elastic force of the return spring 6); When the valve is closed, the primary sealing ring 36-1 on the valve core 31 first contacts the valve seat 2, forming the first-level seal on the valve seat 2. When the secondary sealing ring 36-2 of the valve core 31 contacts the valve seat 2, a second-level seal is formed. When the valve core 31 contacts the valve seat 2, a third-level seal is formed, so that a three-level seal can be formed between the valve core assembly 3 and the valve seat 2. At the same time, the primary sealing ring 36-1 and the secondary sealing ring 36-2 have a certain independent centering ability, and independently form a seal on the valve seat 2, so as to realize the multi-level sealing, multi-level pressure reduction, and multi-level centering of the one-way valve, reduce the formation of erosion, and thus improve the life of the one-way valve. In this case, the elastic force of the buffer 35 after compression is much smaller than the inertia force of the valve core 31 when it is closed, so it has limited effect on reducing the impact of the valve core 31 on the valve seat 2.
[0031] The second case: during the closing process, the elastic force of the lower buffer 35-2 is smaller than the elastic force of the upper buffer 35-1, and the elastic force of the upper buffer 35-1 is larger than the elastic force of the return spring 6, preferably, equivalent to the maximum inertia force generated when the valve core is closed, but smaller than the blind plate force when the maximum pressure difference between the upper and lower surfaces of the valve core 31 occurs; When the valve is closed, the primary sealing ring 36-1 on the valve core 31 first contacts the valve seat 2 to form a primary seal on the valve seat 2. When the secondary sealing ring 36-2 of the valve core 31 contacts the valve seat 2, a secondary seal is formed. After the valve core 31 contacts the valve seat 2, it will rebound in the opposite direction. Only when both the primary and secondary seals fail seriously, that is, when the pressure difference between the upper and lower media of the valve core sealing surface 31-1 is large enough, the valve core sealing surface 31-1 and the valve seat sealing surface 21 form a third seal. The impact force between the valve core 31 and the valve seat 2 is absorbed by the upper buffer member 35-1 and the lower buffer member 35-2, thereby greatly reducing the impact force directly acting on the valve core 31; at the same time, the first-level sealing ring 36-1 and the second-level sealing ring 36-2 have a certain independent self-adjusting ability, and independently form a seal on the valve seat 2, thereby realizing multi-stage sealing, multi-stage pressure reduction, and multi-stage self-adjustment of the one-way valve, thereby improving the life of the one-way valve. After the sealing ring 36 is damaged, the sealing ring 36 and / or the buffer member 35 can be replaced separately without replacing the entire valve core assembly 3, thereby reducing the subsequent replacement and maintenance costs.
[0032] As a preferred embodiment, the buffer member 35 is a metal elastic element. Preferably, the buffer member 35 is a disc spring or a spring, which is used in an environment with relatively high temperature.
[0033] As a preferred embodiment, the buffer component 35 is made of a non-metallic elastic material. Preferably, the buffer component 35 is made of fluororubber and is used in an environment with a relatively low temperature.
[0034] As a preferred embodiment, the buffer member 35 can also be made of a composite of non-metallic materials and metal elements. Preferably, the composite buffer member 35 includes a non-metallic elastic pad and a metal elastic member embedded on the upper and lower surfaces of the non-metallic elastic pad. Preferably, the non-metallic elastic pad is made of a rubber material, and the metal elastic member is a disc spring or a spring.
[0035] As a preferred embodiment, the sealing ring 36 is made of a high-strength alloy, the sealing surface 36-3 of the sealing ring is treated with tungsten carbide, and the valve core sealing surface 31-1 is preferably hardened with No. 6 cobalt-based alloy; Correspondingly, the portion of the valve seat sealing surface 21 that matches the sealing ring sealing surface 36-3 is also treated with tungsten carbide, and the portion that matches the valve core sealing surface 31-1 is also hardened with No. 6 cobalt-based alloy; the segmented alloy treatment of the valve seat sealing surface 21 and the different hardening treatments of the sealing ring sealing surface 36-3 and the valve core sealing surface 31-1 take into account the erosion resistance and impact resistance of each sealing surface, which can further improve the life of the one-way valve.
[0036] As a preferred embodiment, a sealing ring 37 is further provided between the sealing ring 36 and the groove 34, and / or a sealing ring 37 is also provided between the buffer 35 and the groove 34; When the valve core assembly 3 is in a closed state, the sealing ring 37 serves as an isolation seal between the upper side and the lower side of the sealing ring 36 and / or the buffer member 35 to reduce the leakage of the medium.
[0037] As a preferred embodiment, see Figure 4-Figure 6 , the cross-sections of the upper guide rod 32 and the lower guide rod 33 are regular polygons, preferably, the cross-sections are regular triangles, squares, regular pentagons or regular hexagons; Alternatively, see Figure 4 The cross-sections of the upper guide rod 32 and the lower guide rod 33 are circular, and at least two guide planes 321 are provided on the sides of the upper guide rod 32 and the lower guide rod 33 .
[0038] As a preferred embodiment, see Figure 4-Figure 6 The rolling guide structure 5 includes a guide hole 51 for the upper guide rod 32 or the lower guide rod 33 to pass through (the guide hole 51 is provided in the middle of the valve seat 2 and the guide frame 4), and the cross section of the guide hole 51 is matched with the cross section of the two guide rods; A compressible guide roller assembly 52 is matched on each guide surface of the guide hole 51, so that the corresponding guide rod is in full contact with the compressible guide roller assembly 52 and can absorb the impact force when the valve core 31 moves up and down; The arrangement of the compressible guide roller assembly 52, when the valve core assembly 3 and the valve seat 2 or the guide frame 4 are subjected to strong impact or strong unbalanced load, the elastic member 523a or the elastic sleeve 523b is fully compressed, and the guide hole 51 provides strong guidance and stable limit to the upper guide rod 32 and the lower guide rod 33, thereby protecting the roller and ensuring the normal operation of the valve core assembly 3 in up and down reciprocating motion; At the same time, the arrangement of the compressible guide roller assembly 52 enables the roller of the compressible guide roller assembly 52 to push against the upper guide rod 32 and the lower guide rod 33 under the action of its elastic member 523a or elastic sleeve 523b, thereby effectively buffering the impact of the guide rod on the roller, thereby increasing the service life of the one-way valve.
[0039] As a preferred embodiment, see Figure 4 and Figure 5 The compressible guide roller assembly 52 includes a rotating shaft 521a and a roller 522a rotatably disposed on the rotating shaft 521a, and an elastic member 523a for contacting the outer wall of the rotating shaft 521a; The elastic member 523a is arranged on the side of the rotating shaft 521a away from the guide rod; preferably, the elastic member 523a is made of one of Inconel alloy and fluororubber.
[0040] As a preferred embodiment, see Figure 6 The compressible guide roller assembly 52 includes a rotating shaft 521b, an elastic sleeve 523b sleeved on the outer wall of the rotating shaft 521b, and a roller 522b rotatably arranged outside the elastic sleeve 523b. Preferably, the elastic sleeve 523b is made of elastic rubber material; The elastic member 523a or the elastic sleeve 523b is disposed on the side of the rotating shaft 521a or the rotating shaft 521b away from the guide rod. When the elastic member 523a or the elastic sleeve 523b is fully extended, the outer edge of the roller 522a or the roller 522b exceeds the corresponding guide surface; when the elastic member 523a or the elastic sleeve 523b is fully compressed, the outer edge of the roller 522a or the roller 522b is retracted into the corresponding guide surface.
[0041] The normal operating conditions of the one-way valve of the high-pressure acid leaching autoclave feed pump are: the valve core pressure difference is 0~3MPa, the slurry is 200 degrees Celsius, sometimes weak corrosion occurs, and the valve core switches about 30 times per minute. In the traditional one-way valve, the valve core shaft and the support of the valve core shaft adopt sliding friction between metal parts, and the guide hole 51 surface and the guide rod are all sliding friction, and the matching pair has no limiting structure. The valve core may also produce rotational motion, and the matching clearance is at the millimeter level, with poor stability and large wear. With the rolling guide structure 5 provided by the present invention, there is rolling friction between the guide rod and the valve seat 2 and the guide frame 4. It is a precision matching pair with good stability. The friction force on the guide rod is much smaller than the sliding friction of the traditional one-way valve; When the guide rod frequently reciprocates and a large imbalance occurs, the guide rod deviates in one direction, pressing the roller, which pushes the rotating shaft to deviate and compresses the elastic member 523a or the elastic sleeve 523b until the guide rod and the guide hole 51 come into hard contact, so that the valve seat 2 / guide frame 4 can provide stable and strong guidance and limit to the guide rod, ensuring that the one-way valve is maintained in a normal working state. Since the roller is an elastic support, it has a buffering effect on the unbalanced operation of the guide rod, and also protects the roller and the rotating shaft. Since the guide hole 51 has a square fit with the guide rod, the guide rod will not rotate.
[0042] Example 2 The present invention also provides a feeding pump, comprising a pump body and a one-way valve for metallurgical and chemical equipment as described in Example 1, which is arranged on the pump body; the setting of the one-way valve enables the feeding pump to run smoothly, reduces downtime for maintenance, and thus can improve production efficiency.
[0043] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.
Claims
1. A one-way valve for metallurgical and chemical equipment, characterized in that: It comprises a housing, a valve seat arranged in the housing, a valve core assembly matched with the valve seat, and a guide frame arranged on the top of the housing; The valve core assembly includes a valve core, an upper guide rod extends from the top of the valve core, and a lower guide rod extends from the bottom of the valve core; A sealing buffer structure is provided at the sealing joint between the valve core and the valve seat, and the sealing buffer structure includes a buffer and a sealing ring, and the sealing ring can move up and down to contact the buffer to absorb impact force; the outer walls of the valve core and the sealing ring respectively have a valve core sealing surface and a sealing ring sealing surface matching the valve seat; A rolling guide structure is provided in the middle of the valve seat, and the lower guide rod passes through the valve seat and is matched with the rolling guide structure; The rolling guide structure is provided in the middle of the guide frame, and the upper guide rod passes through the guide frame and is matched with the rolling guide structure.
2. A one-way valve for metallurgical and chemical equipment according to claim 1, characterized in that: A groove is provided at the bottom of the valve core, the buffer is embedded in the groove, the sealing ring is pressed and covered on the buffer through a nut plate, and the sealing surface of the sealing ring and the sealing surface of the valve core form a combined sealing surface of the valve core.
3. A one-way valve for metallurgical and chemical equipment according to claim 1, characterized in that: A groove is provided at the sealing joint of the valve core, and at least one sealing ring is detachably arranged in the groove; When one sealing ring is provided, the buffer member is arranged between the upper surface of the sealing ring and the groove; When two or more sealing rings are provided, the sealing rings are stacked from top to bottom, and the buffer is arranged between two adjacent sealing rings and / or between the upper surface of the sealing ring and the groove; Each sealing ring sealing surface and the valve core sealing surface sequentially form a valve core combined sealing surface.
4. A one-way valve for metallurgical and chemical equipment according to any one of claims 1 to 3, characterized in that: The buffer is made of a metal elastic element or a non-metal elastic material.
5. A one-way valve for metallurgical and chemical equipment according to any one of claims 1 to 3, characterized in that: The buffer is made of a composite of non-metallic materials and metal elements; Specifically, the composite buffer comprises a non-metallic elastic pad and a metal elastic member embedded on the upper and lower surfaces of the non-metallic elastic pad.
6. A one-way valve for metallurgical and chemical equipment according to claim 2 or 3, characterized in that: A sealing ring is also provided between the sealing ring and the groove.
7. A one-way valve for metallurgical and chemical equipment according to any one of claims 1 to 3, characterized in that: The cross sections of the upper guide rod and the lower guide rod are regular polygons; Alternatively, the cross-sections of the upper guide rod and the lower guide rod are circular, and at least two guide planes are provided on the side surfaces of the upper guide rod and the lower guide rod.
8. A one-way valve for metallurgical and chemical equipment according to claim 7, characterized in that: The rolling guide structure includes a guide hole for the upper guide rod or the lower guide rod to pass through, and the cross section of the guide hole is matched with the cross section of the two guide rods; A compressible guide roller assembly is matched on each guide surface of the guide hole, so that the corresponding guide rod is in full contact with the compressible guide roller assembly and can absorb the impact force when the valve core moves up and down.
9. A one-way valve for metallurgical and chemical equipment according to claim 8, characterized in that: The compressible guide roller assembly comprises a rotating shaft, a roller rotatably arranged on the rotating shaft, and an elastic member for contacting the outer wall of the rotating shaft; The elastic member is arranged on the side of the rotating shaft away from the guide rod, and the outer edge of the roller exceeds the corresponding guide surface.
10. A one-way valve for metallurgical and chemical equipment according to claim 8, characterized in that: The compressible guide roller assembly comprises a rotating shaft, an elastic sleeve sleeved on the outer wall of the rotating shaft, and a roller rotatably arranged outside the elastic sleeve.
11. A one-way valve for metallurgical and chemical equipment according to claim 8, characterized in that: The sealing ring is made of high-strength alloy, and the sealing ring sealing surface of the sealing ring and the valve seat sealing surface of the valve seat matched therewith are treated with tungsten carbide; the valve core sealing surface of the valve core and the valve seat sealing surface of the valve seat matched therewith are hardened with No. 6 cobalt-based alloy.
12. A feed pump, characterized in that: The invention comprises a pump body and a one-way valve for metallurgical and chemical equipment as claimed in any one of claims 1 to 11 arranged on the pump body.