Eccentric half ball valve with high sealing performance

Abstract

The utility model discloses a high-sealing eccentric semi-ball valve, which belongs to the technical field of valves and comprises a valve body and a semi-ball valve core. A valve seat is arranged on one side of a liquid outlet of the valve body, and a spherical crown used for abutting against the valve seat to achieve the sealing effect on the valve body is arranged on the outer edge of the valve body. A multi-stage sealing mechanism is arranged between the upper valve rod and the upper flange; a soft and hard double-sealing mechanism is arranged between the spherical crown and the valve seat; the soft and hard double-sealing mechanism comprises a main sealing ring and a self-cleaning type elastic hard sealing assembly, and a low-torque rotating mechanism capable of effectively reducing the torque of the upper valve rod and the torque of the lower valve rod is arranged between the lower valve rod and the lower flange. By means of the mode, an elastic pair sealing structure between the spherical crown and the valve seat is achieved through cooperation of the spring and the floating type anti-falling pin, sealing is more facilitated, the elastic pre-tightening function of the valve seat is achieved through the spring, the valve seat has the load compensation function all the time, and the reliable sealing condition is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a high sealing eccentricity half ball valve. BACKGROUND

[0002] A large number of valves are needed in large water conservancy projects, and the valves still need to have high performance under the condition of large diameter.

[0003] Chinese patent CN215293673U discloses a large-diameter soft sealing eccentric half ball valve, which comprises a vertically arranged valve body, a ball body in the valve body, a spherical crown on the upper end of the ball body, a sealing ring on the spherical crown and a valve seat in the upper part of the valve body and matched with the sealing ring, and the sealing ring is a circular ring; A circular boss is coaxially arranged on the upper side of the middle part of the spherical crown, the sealing ring is sleeved on the circular boss and fixed on the spherical crown by a plurality of bolts, and the plurality of bolts are uniformly distributed around the circular boss; The sealing ring comprises an annular metal framework and a rubber outer lining vulcanized on the outer side of the metal framework, the rubber outer lining is a sealing surface, the metal framework is coaxially arranged with the circular boss and has a plurality of through holes on the inner side for the bolts to pass through; The valve seat is a metal welding ring welded on the valve body and annular, the sealing performance of the half ball valve is increased by adjusting the sealing ring and the valve seat, but the eccentric half ball valve still has the following problems:

[0004] 1. River water and lake water usually contain a large amount of silt, and impurities are easily attached between the sealing surface of the valve body and the spherical crown during long-term use of the equipment, which increases the risk of valve jamming and sealing failure, and the sealing structure between the valve body and the spherical crown is prone to aging and leads to a decrease in sealing performance;

[0005] 2. During the operation of the large-diameter valve, the pressure in the valve cavity is large, and the valve rod has the risk of blasting and spraying out.

[0006] Therefore, the utility model designs a high sealing eccentric half ball valve to solve the above problems. CONTENT OF THE UTILITY MODEL

[0007] In view of the above shortcomings of the prior art, the utility model provides a high sealing eccentric half ball valve.

[0008] To achieve the above purpose, the utility model realizes the following technical scheme:

[0009] A high sealing eccentric half ball valve, comprising a valve body and a half ball valve core;

[0010] A valve cavity is arranged in the valve body, and a liquid inlet and a liquid outlet are arranged on the two sides of the valve body, and the liquid inlet and the liquid outlet are communicated with the valve cavity;

[0011] The upper end and the lower end of the valve body are respectively provided with an upper flange and a lower flange, an upper valve rod is rotatably installed in the upper flange, and a lower valve rod is rotatably installed in the lower flange;

[0012] A hemispherical valve core is rotatably arranged in the valve cavity, the upper end and the lower end of the hemispherical valve core are fixedly connected with the upper valve rod and the lower valve rod respectively, and the cross section of the hemispherical valve core is arc-shaped;

[0013] A valve seat is arranged on one side of the liquid outlet of the valve body, and a spherical crown is arranged outside the hemispherical valve core and used for abutting against the valve seat to realize the sealing effect of the valve body;

[0014] A multi-stage sealing mechanism is arranged between the upper valve rod and the upper flange;

[0015] A soft and hard double sealing mechanism is arranged between the spherical crown and the valve seat, the soft and hard double sealing mechanism comprises a main sealing ring and a self-cleaning elastic hard sealing assembly, the sealing surface of the valve seat is fixedly installed with the main sealing ring used for abutting against the sealing surface of the spherical crown, and the self-cleaning elastic hard sealing assembly is arranged on the valve seat and used for guaranteeing the sealing performance of the valve body in the case that the main sealing ring fails;

[0016] A low-torque rotating mechanism used for reducing the torque of the upper valve rod and the lower valve rod is arranged between the lower valve rod and the lower flange.

[0017] Further, the self-cleaning elastic hard sealing assembly further comprises a scraper, the sealing surface of the valve seat is fixedly installed with the scraper with a blade edge extending along the arc line of the spherical crown, and the scraper is tightly combined with the sealing surface of the spherical crown.

[0018] Further, the self-cleaning elastic hard sealing assembly comprises a first dustproof ring, a second dustproof ring, a valve seat O-shaped ring and an elastic sealing assembly, the two ends of the valve seat are respectively fixedly installed with the first dustproof ring and the second dustproof ring, and the first dustproof ring and the second dustproof ring are used for blocking the external impurities from entering the gap between the valve seat and the valve body; at least two valve seat O-shaped rings are fixedly installed at one end of the valve seat close to the spherical crown; and the elastic sealing assembly is installed between the valve seat and the valve body.

[0019] Further, the elastic sealing assembly comprises a spring and a floating anti-falling pin, a plurality of springs are fixedly installed between the valve seat and the valve body along the radial direction of the liquid outlet of the valve body at equal intervals, and the valve seat is fixedly connected with the valve body through a plurality of floating anti-falling pins, and the floating anti-falling pins are also distributed along the radial direction of the liquid outlet of the valve body at equal intervals.

[0020] Further, the multi-stage sealing mechanism comprises a packing gland, a high-performance combined packing, a sealing ring, a valve rod O-shaped ring and a four-opening ring, the upper valve rod adopts a “T” type structure, the “T” type step of the upper valve rod is rotatably connected with the upper flange through a bearing; and the packing gland, the sealing ring and the four-opening ring are sequentially arranged from top to bottom between the side surface of the upper valve rod and the inner wall of the upper flange and at the upper side position of the “T” type step of the upper valve rod.

[0021] Further, the packing gland is fixedly connected with the upper flange through bolts;

[0022] A plurality of valve stem O-rings are arranged between the sealing ring and the upper valve stem;

[0023] High-performance combined packing is filled between the packing gland and the sealing ring;

[0024] The four open rings are in close contact with the bearing installed on the outer side of the upper valve stem.

[0025] Further, the low-torque rotating mechanism comprises a lubricating composite bearing and a thrust bearing, the lubricating composite bearing is arranged between the semi-spherical valve core and the lower flange, and the lubricating composite bearing serves as the main rotating structure between the semi-spherical valve core and the lower flange; the thrust bearing is arranged between the semi-spherical valve core and the lubricating composite bearing, and is used for bearing and transmitting axial load.

[0026] Compared with the prior art, the utility model has the advantages that: 1. In the utility model, the elastic pair sealing structure between the spherical crown and the valve seat is realized through the cooperation of the spring and the floating type anti-dropping peg, which is more helpful for sealing, and the spring realizes the function of elastic pre-tightening of the valve seat, so that the valve seat always has the function of load compensation, thereby the sealing performance of the valve can be ensured by the elastic pair sealing in the case of failure of the main sealing, and the reliable sealing condition is met.

[0027] 2. The cooperation effect of the sealing ring provided with multiple EPDM material valve stem O-rings and the high-performance combined packing is adopted to realize the multi-channel sealing structure, realize the effective long-term sealing effect, and the four open rings clamp the "T"-shaped step of the upper valve stem, and the upper valve stem can be removed only after the four open rings are removed, so that the safety hazard of burst spraying of the upper valve stem is avoided.

[0028] 3. The lubricating composite bearing serves as the main rotating structure between the semi-spherical valve core and the lower flange; the thrust bearing is arranged between the semi-spherical valve core and the lubricating composite bearing, and is used for bearing and transmitting axial load; the friction coefficient of the lubricating composite bearing is greater than or equal to 0.001, the friction coefficient of the thrust bearing is 0.001, the weight of the semi-spherical valve core of the super-large diameter valve body is ton level, and the cooperation of the lubricating composite bearing and the thrust bearing greatly reduces the valve operation torque, the valve can adopt a low-torque operation executing mechanism, and cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creating labor under the premise.

[0030] Figure 1 A perspective view of the high-sealing eccentric half-ball valve of the utility model Figure 1 ;

[0031] Figure 2 A perspective view of the high-sealing eccentric half-ball valve of the utility model Figure 2 ;

[0032] Figure 3 A perspective view of the utility model hidden valve body

[0033] Figure 4 A perspective view of the utility model valve seat

[0034] Figure 5 A right view of the high-sealing eccentric half-ball valve of the utility model

[0035] Figure 6 A sectional view along the A-A direction of Figure 5 ;

[0036] Figure 7 An enlarged view of B in Figure 6 ;

[0037] Figure 8 An enlarged view of C in Figure 6 ;

[0038] Figure 9 An enlarged view of D in Figure 6 .

[0039] The reference numerals in the drawings represent respectively:

[0040] 10, valve body; 101, valve cavity; 102, liquid inlet; 103, liquid outlet; 11, half-ball valve core; 12, upper valve rod; 13, lower valve rod; 14, upper flange; 15, lower flange; 16, spherical crown; 17, valve seat; 2, multi-stage sealing mechanism; 21, packing gland; 22, high-performance combined packing; 23, sealing ring; 24, valve rod O-ring; 25, four-opening ring; 3, soft and hard double-sealing mechanism; 31, main sealing ring; 32, scraper; 33, first dust-proof ring; 34, second dust-proof ring; 35, valve seat O-ring; 36, spring; 37, floating type anti-falling pin; 4, low-torque rotating mechanism; 41, lubricating composite bearing; 42, thrust bearing. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0042] In the following description, "left", "right", "front", "rear", "upper", "lower" are oriented in the perspective of the front view.

[0043] Embodiment one: in some embodiments, referring to the drawings of the specification Figures 1-9 A high-sealing eccentric half-ball valve, comprising a valve body 10 and a half-ball valve core 11;

[0044] The valve body 10 is provided with a valve cavity 101, and the two sides of the valve body 10 are respectively provided with a liquid inlet 102 and a liquid outlet 103, which are communicated with the valve cavity 101;

[0045] The upper end and the lower end of the valve body 10 are respectively provided with an upper flange 14 and a lower flange 15, the upper valve rod 12 is rotatably installed in the inner part of the upper flange 14, and the lower valve rod 13 is rotatably installed in the inner part of the lower flange 15;

[0046] The half-ball valve core 11 is rotatably arranged in the valve cavity 101, the upper end and the lower end of the half-ball valve core 11 are fixedly connected with the upper valve rod 12 and the lower valve rod 13 respectively, and the cross section of the half-ball valve core 11 is arc-shaped;

[0047] One side of the liquid outlet 103 of the valve body 10 is provided with a valve seat 17, and the outer side of the half-ball valve core 11 is provided with a spherical crown 16 for abutting against the valve seat 17 to realize the sealing effect of the valve body 10;

[0048] A multistage sealing mechanism 2 is arranged between the upper valve rod 12 and the upper flange 14;

[0049] A soft and hard double sealing mechanism 3 is arranged between the spherical crown 16 and the valve seat 17; the soft and hard double sealing mechanism 3 comprises a main sealing ring 31 and a self-cleaning elastic hard sealing assembly, the sealing surface of the valve seat 17 is fixedly installed with the main sealing ring 31 for abutting against the sealing surface of the spherical crown 16, the main sealing ring 31 is made of EPDM material, and the soft sealing of the valve body 10 is realized when the spherical crown 16 and the valve seat 17 are closed; the self-cleaning elastic hard sealing assembly is arranged on the valve seat 17, and is used for guaranteeing the sealing performance of the valve body 10 in the case that the main sealing ring 31 fails.

[0050] A low-torque rotating mechanism 4 is arranged between the lower valve stem 13 and the lower flange 15 to reduce the torque of the upper valve stem 12 and the lower valve stem 13.

[0051] In some embodiments, as shown in the drawings, as a preferred embodiment of the utility model, the self-cleaning elastic hard sealing assembly comprises a scraper 32, a first dustproof ring 33, a second dustproof ring 34, a valve seat O-shaped ring 35, a spring 36 and a floating anti-disengagement pin 37, the sealing surface of the valve seat 17 is fixedly installed with the scraper 32, the edge of which extends along the arc of the spherical crown 16, the scraper 32 is tightly combined with the sealing surface of the spherical crown 16, and in the process of fully opening and fully closing the semi-spherical valve element 11 and the valve body 10, the scraper 32 is tightly combined with the sealing surface of the spherical crown 16, so that the particulate medium and impurities adhered to the surface of the spherical core are scraped off. Figure 7 The two ends of the valve seat 17 are fixedly installed with the first dustproof ring 33 and the second dustproof ring 34, respectively, and the first dustproof ring 33 and the second dustproof ring 34 are used for blocking the entry of external impurities into the gap between the valve seat 17 and the valve body 10.

[0052] A plurality of springs 36 are fixedly installed between the valve seat 17 and the valve body 10 along the radial direction of the liquid outlet 103 of the valve body 10 at equal intervals, and the valve seat 17 is fixedly connected with the valve body 10 through a plurality of floating anti-disengagement pins 37, and the floating anti-disengagement pins 37 are also distributed along the radial direction of the liquid outlet 103 of the valve body 10 at equal intervals.

[0053] A gap of 3.75 mm is provided between the floating anti-disengagement pins 37 and the valve seat 17, and the gap between the valve seat 17 and the valve body 10 is 3 mm.

[0054] In the utility model, the spring 36 and the floating anti-disengagement pin 37 are matched to realize the elastic auxiliary sealing structure between the spherical crown 16 and the valve seat 17, which is more helpful for sealing, and the spring 36 realizes the function of elastic pre-tightening of the valve seat 17, so that the valve seat 17 always has the function of load compensation, so that in the case of main sealing failure, the elastic auxiliary sealing can still guarantee the sealing performance of the valve.

[0055] In the utility model, the valve seat spring pre-tightening force calculation value FMY = nP'S (n is the number of springs, P' is the stiffness of a single spring, and S is the compression amount of a single spring), and the result value is 19072 N.

[0056] The force of the medium pressing on the ball through the valve seat is calculated as FZJQ = πP (DJH2-DM2) / 4 (in the formula, P is the calculation pressure, DJH is the outer diameter of the valve seat piston cylinder, and DM is the diameter of the sealing surface), and the result value is 164314 N.

[0057] The friction force of the O-ring is calculated as FMM=πDJHbm'Zqof0 (where DJH is the outer diameter of the valve seat piston cylinder, bm' is the contact width of the O-ring with the valve seat support ring, Z is the number of O-rings, qo is the sealing specific pressure of the O-ring, Z is the number of O-rings, and f0 is the friction coefficient of the O-ring), and the result is 6958 N.

[0058] The total acting force on the sealing surface is calculated as FMZ=FZJQ+FMY-FMM

[0059] The working specific pressure on the valve seat sealing surface is calculated as q=FMZ / (2πRhcosα) (where R is the radius of the sphere, h is the projection width of the sealing surface, and α is the included angle between the sealing surface and the flow passage direction), and the result is q=4.64.

[0060] The required specific pressure of the sealing surface (where C is the material coefficient of the sealing surface, K is the specific pressure coefficient, P is the calculated pressure, and bM is the width of the sealing surface), and the result is 0.87

[0061] The allowable specific pressure of the sealing surface [qMF] is 5.0 according to the table.

[0062] Therefore, qMF<q≤[qMF], which satisfies the reliable sealing condition.

[0063] The sealing surfaces of the spherical crown 16 and the valve seat 17 are sprayed with hard alloy, which increases the wear resistance of the sealing surfaces of the spherical crown 16 and the valve seat 17.

[0064] In some embodiments, as shown in Figure 8 As a preferred embodiment of the utility model, the multi-stage sealing mechanism 2 includes a packing gland 21, a high-performance combined packing 22, a sealing ring 23, a valve stem O-ring 24, and a four-opening ring 25. The upper valve stem 12 adopts a "T" type structure, and the "T" type step of the upper valve stem 12 is rotatably connected to the upper flange 14 through a bearing. The packing gland 21, the sealing ring 23, and the four-opening ring 25 are sequentially arranged from top to bottom between the side surface of the upper valve stem 12 and the inner wall of the upper flange 14 and located at the upper side of the "T" type step of the upper valve stem 12.

[0065] The packing gland 21 is fixedly connected to the upper flange 14 through bolts.

[0066] A plurality of valve stem O-rings 24 are arranged between the sealing ring 23 and the upper valve stem 12, and the valve stem O-rings 24 are made of EPDM material.

[0067] The high-performance combined packing 22 is filled between the packing gland 21 and the sealing ring 23, and the high-performance combined packing 22 sequentially adopts flexible graphite packing, flexible graphite packing with stainless steel wire, and flexible graphite packing from top to bottom. A gasket is arranged between each layer.

[0068] The four open rings 25 are in close contact with the bearings installed outside the upper valve stem 12.

[0069] In the utility model, through adopting the cooperation effect of the sealing ring 23 provided with the multiple EPDM material valve stem O-shaped rings 24 and the high-performance combined packing 22, the multiple sealing structure is realized, the effective long-term sealing effect is realized, and the four open rings 25 clamp the T-shaped step of the upper valve stem 12, the upper valve stem 12 can be removed only after the four open rings 25 are removed, so that the safety hidden danger of the upper valve stem 12 from being burst is avoided.

[0070] In some embodiments, as shown in Figure 9 As a preferred embodiment of the utility model, the low-torque rotating mechanism 4 includes a lubricating composite bearing 41 and a thrust bearing 42, the lubricating composite bearing 41 is arranged between the half-ball valve core 11 and the lower flange 15, and the lubricating composite bearing 41 is the main rotating structure between the half-ball valve core 11 and the lower flange 15; the thrust bearing 42 is arranged between the half-ball valve core 11 and the lubricating composite bearing 41 and is used for bearing and transmitting axial load; the friction coefficient of the lubricating composite bearing 41 is greater than or equal to 0.05, the friction coefficient of the thrust bearing 42 is 0.002, the weight of the half-ball valve core 11 of the super-large diameter valve body 10 is ton level, and the cooperation of the lubricating composite bearing 41 and the thrust bearing 42 greatly reduces the valve operating torque, the valve can adopt a low-torque operation executing mechanism, and cost is saved.

[0071] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than limit them; although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified or some technical features can be replaced equivalently; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A high-sealing eccentric half-ball valve, comprising a valve body (10) and a half-ball valve core (11), characterized in that: a valve cavity (101) is arranged in the valve body (10), and a liquid inlet (102) and a liquid outlet (103) are respectively arranged on two sides of the valve body (10) and communicate with the valve cavity (101); an upper flange (14) and a lower flange (15) are respectively arranged at the upper end and the lower end of the valve body (10), an upper valve rod (12) is rotatably arranged in the upper flange (14), and a lower valve rod (13) is rotatably arranged in the lower flange (15); the half-ball valve core (11) is rotatably arranged in the valve cavity (101), the upper end and the lower end of the half-ball valve core (11) are fixedly connected with the upper valve rod (12) and the lower valve rod (13) respectively, and the cross section of the half-ball valve core (11) is arc-shaped; a valve seat (17) is arranged on one side of the liquid outlet (103) of the valve body (10), and a spherical crown (16) is arranged on the outer side of the half-ball valve core (11) to abut against the valve seat (17) to realize sealing effect of the valve body (10); a multi-stage sealing mechanism (2) is arranged between the upper valve rod (12) and the upper flange (14); a soft and hard double sealing mechanism (3) is arranged between the spherical crown (16) and the valve seat (17); the soft and hard double sealing mechanism (3) comprises a main sealing ring (31) and a self-cleaning elastic hard sealing assembly, the sealing surface of the valve seat (17) is fixedly provided with the main sealing ring (31) for abutting against the sealing surface of the spherical crown (16), the self-cleaning elastic hard sealing assembly is arranged on the valve seat (17) to ensure the sealing performance of the valve body (10) in the case that the main sealing ring (31) fails; a low-torque rotating mechanism (4) is arranged between the lower valve rod (13) and the lower flange (15) to reduce the torque of the upper valve rod (12) and the lower valve rod (13); the self-cleaning elastic hard sealing assembly comprises a first dustproof ring (33), a second dustproof ring (34), a valve seat O-shaped ring (35) and an elastic sealing assembly, the two ends of the valve seat (17) are fixedly provided with the first dustproof ring (33) and the second dustproof ring (34) respectively, the first dustproof ring (33) and the second dustproof ring (34) are used for blocking external impurities from entering the gap between the valve seat (17) and the valve body (10); at least two valve seat O-shaped rings (35) are fixedly arranged at the end of the valve seat (17) close to the spherical crown (16); the elastic sealing assembly is arranged between the valve seat (17) and the valve body (10); the elastic sealing assembly comprises a spring (36) and a floating anti-falling pin (37), a plurality of springs (36) are fixedly arranged between the valve seat (17) and the valve body (10) along the radial direction of the liquid outlet (103) of the valve body (10), and the valve seat (17) is fixedly connected with the valve body (10) through a plurality of floating anti-falling pins (37), and the floating anti-falling pins (37) are also distributed along the radial direction of the liquid outlet (103) of the valve body (10) at equal intervals. ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The high containment eccentric hemisphere valve of claim 1, wherein, The self-cleaning elastic hard sealing assembly further comprises a scraper (32), the sealing surface of the valve seat (17) is fixedly installed with the scraper (32) with a blade edge extending along the arc of the spherical cap (16), and the scraper (32) is tightly combined with the sealing surface of the spherical cap (16).

3. The high containment eccentric hemisphere valve of claim 2, wherein, The multi-stage sealing mechanism (2) comprises a packing gland (21), a high-performance combined packing (22), a sealing ring (23), a valve stem O-shaped ring (24) and a four-opening ring (25), the upper valve stem (12) adopts a "T" type structure, the "T" type step of the upper valve stem (12) is rotatably connected with the upper flange (14) through a bearing, and the packing gland (21), the sealing ring (23) and the four-opening ring (25) are sequentially arranged from top to bottom between the side surface of the upper valve stem (12) and the inner wall of the upper flange (14) and located at the upper side of the "T" type step of the upper valve stem (12).

4. The high containment eccentric hemisphere valve of claim 3, wherein, The packing gland (21) is fixedly connected with the upper flange (14) through bolts; A plurality of valve stem O-shaped rings (24) are arranged between the sealing ring (23) and the upper valve stem (12); The high-performance combined packing (22) is filled between the packing gland (21) and the sealing ring (23); The four-opening ring (25) is in close contact with the bearing installed on the outer side of the upper valve stem (12).

5. The high containment eccentric hemisphere valve of claim 4, wherein, The low-torque rotating mechanism (4) comprises a lubricating composite bearing (41) and a thrust bearing (42), the lubricating composite bearing (41) is arranged between the hemispherical valve core (11) and the lower flange (15), and the lubricating composite bearing (41) serves as the main rotating structure between the hemispherical valve core (11) and the lower flange (15); the thrust bearing (42) is arranged between the hemispherical valve core (11) and the lubricating composite bearing (41) and is used for bearing and transmitting axial load.

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