Slurry ball valve based on multi-stage sealing

Abstract

The utility model relates to ball valve technical field, concretely, it relates to a kind of slurry ball valve based on multistage sealing, including valve body, the both sides symmetry fixed connection of valve body have connecting body, the inside of valve body is provided with ball, the lower end of ball is rotatably connected with fixed shaft, the upper end of inside fixed shaft and ball contact position is provided with steel ball, in the process of frequently opening and closing or adjusting valve, effectively avoid the sealing failure caused by ball and upper valve shaft deviation, increase the positional accuracy of ball, the upper end of ball is fixedly provided with upper valve shaft, the outside of upper valve shaft is provided with packing gland, effectively prevent slurry along valve shaft leakage, the packing gland and upper valve shaft between are provided with sealing packing, the valve seat is arranged between the connecting body and ball, the valve seat one end and connecting body between are provided with baffle ring, form the first core sealing defense line of valve flow channel, improve sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and more specifically, to a slurry ball valve based on multi-stage sealing. Background Technology

[0002] With the advancement of global industrialization, industries such as petroleum, chemical, papermaking, and metallurgy are constantly developing, leading to an increasing demand for fluid control equipment. The slurry media in these industries often have characteristics such as high corrosivity, high viscosity, and the presence of solid particles. Ordinary valves are difficult to meet the requirements for wear resistance, corrosion resistance, and sealing, prompting companies to develop high-performance slurry ball valves.

[0003] In some special engineering scenarios, such as tunnel boring machine construction, the medium at the working face cut by the cutterhead is complex. The slurry mixed together can cause valve jamming and erosion, seriously affecting its sealing performance and construction efficiency. Therefore, a slurry ball valve with good sealing performance is needed to overcome such working conditions and meet the application requirements. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing a slurry ball valve based on multi-stage sealing. It solves the problems in traditional technology where the mixed slurry can cause jamming and erosion of the valve, resulting in insufficient sealing performance and poor wear and corrosion resistance of the slurry ball valve.

[0005] To achieve the above objectives, this utility model provides a slurry ball valve based on multi-stage sealing, comprising a valve body, connecting bodies symmetrically and fixedly connected to both sides of the valve body, a ball disposed inside the valve body, a fixed shaft rotatably connected to the lower end of the ball, a steel ball disposed at the upper end of the fixed shaft in contact with the ball, an upper valve shaft fixedly disposed at the upper end of the ball, a stuffing box disposed outside the upper valve shaft, sealing packing disposed between the stuffing box and the upper valve shaft, a valve seat disposed between the connecting bodies and the ball, and a retaining ring disposed between one end of the valve seat and the connecting body.

[0006] The beneficial effects of this utility model are:

[0007] 1. During valve opening and closing, the bottom of the ball is connected to the fixed shaft, effectively preventing displacement or tilting of the ball under the impact of high-pressure slurry, ensuring precise alignment of the ball's rotation center with the valve seat's sealing surface. This effectively avoids sealing failure caused by misalignment of the ball and the upper valve shaft, increasing the ball's positional accuracy.

[0008] 2. During use, the sealing packing forms an annular sealing band on the surface of the upper valve shaft, effectively preventing slurry leakage along the valve shaft. This design is particularly suitable for valves that are frequently opened and closed, maintaining sealing performance for a long time while preventing external impurities from entering the valve.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Preferably, the fixed shaft and stuffing box are fixedly connected to the lower end of the valve body by external screws, and the valve seat is fixedly connected to one end of the connecting body by bolts.

[0011] The advantages of adopting the above-mentioned further solutions are that it facilitates precise adjustment of the perpendicularity of the fixed shaft and the clamping force of the stuffing box during production and assembly, reduces the impact of assembly errors on sealing and rotation performance, and allows for quick replacement of components by removing screws when the steel ball of the fixed shaft wears or the sealing packing of the stuffing box ages, without the need to disassemble the entire valve body, thus reducing maintenance time and costs. After the valve seat is fixed to the connecting body by bolts, it can ensure that the sealing surfaces of the valve seat and the ball always maintain uniform contact, avoiding valve seat displacement due to slurry pressure fluctuations.

[0012] Preferably, a first screw is provided at the bottom of the steel ball, a second screw is provided at the bottom of the first screw, and a plug is provided at the bottom of the second screw.

[0013] The beneficial effect of adopting the above-mentioned further solution is that, by adjusting the combination of the first screw, the second screw, and the plug (for example, by increasing or decreasing the thickness, rotating the threaded structure to adjust the height, etc.), the vertical position of the steel ball can be corrected in real time, so that it always stays at the preset height, avoiding problems such as uneven force caused by positional deviation, which would affect the sealing effect between the fixed shaft and the ball.

[0014] Preferably, O-rings are provided between the outer side of the fixed shaft and the ball, between the outer side of the fixed shaft and the valve body, between the upper valve shaft and the stuffing box, between the stuffing box and the valve body, and at the contact surface between the valve seat and the connecting body.

[0015] The beneficial effects of adopting the above-mentioned further solution are that it prevents dust, liquid or impurities from leaking at the joints of components, forms a multi-stage seal with other sealing structures in each component, significantly reduces the risk of slurry leakage, solves the problem of unreliable sealing of traditional single-seal structures in high-pressure, high-particle slurries, and further enhances the sealing effect of the ball valve.

[0016] Preferably, the inner sides of the connector, the ball, and the valve seat are all coated with hard material, and the contact points between the outer surface of the ball and the valve seat, as well as the contact points between one end of the valve seat and the ball, are all made of hard material through welding.

[0017] The beneficial effects of adopting the above-mentioned further solutions are that they enhance the corrosion resistance and high temperature resistance of the ball valve, extend the service life of the internal structure of the ball valve, enhance the wear resistance between the ball and the valve seat, and maintain contact accuracy and fit stability.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The stable connection between the fixed shaft and the bottom of the ball prevents displacement or tilting of the ball under the impact of high-pressure slurry, ensuring precise alignment between the ball's rotation center and the valve seat's sealing surface. This is crucial for achieving reliable sealing, especially during frequent valve opening, closing, or adjustment. It effectively prevents seal failure caused by misalignment of the ball and upper valve shaft, increasing the ball's positional accuracy. Furthermore, the contact between the top of the fixed shaft and the ball via the steel ball reduces wear at the connection point through the rolling properties of the steel ball. Additionally, when the valve is affected by temperature changes or pressure fluctuations, the steel ball can absorb some deformation stress, preventing seal failure due to component deformation and enhancing the valve's stability under complex operating conditions.

[0020] The sealing packing between the upper valve shaft and the stuffing box forms an annular sealing band on the surface of the upper valve shaft, effectively preventing slurry leakage along the valve shaft. This design is particularly suitable for valves that are frequently opened and closed, maintaining sealing performance for a long time. It also prevents external impurities from entering the valve, and the elastic properties of the sealing packing can automatically compensate for wear, maintaining the sealing effect.

[0021] The hard contact seal between the valve seat and the ball, combined with the positioning and stabilizing effect of the retaining ring, forms the first core sealing defense line of the valve flow channel, improving sealing reliability. Attached Figure Description

[0022] Figure 1 This is a front cross-sectional view of the present invention.

[0023] Figure 2 This is a partial sectional view of the structure of this utility model from the side.

[0024] Figure 3 This is a schematic diagram of the fixed shaft structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the upper valve shaft structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the connector structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the valve seat structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the spherical structure of this utility model.

[0029] The meanings of the labels in the diagram are as follows:

[0030] 1. Valve body;

[0031] 2. Connector;

[0032] 3. Ball; 31. Fixed shaft; 32. Steel ball; 33. First screw; 34. Second screw; 35. Plug; 36. Upper valve shaft; 37. Stuffing box; 38. O-ring; 39. Sealing packing;

[0033] 4. Valve seat; 41. Retaining ring; 42. Bolt. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figures 1-7 As shown, this embodiment provides a slurry ball valve based on multi-stage sealing, including a valve body 1. Considering that in some special engineering scenarios, such as shield tunneling machine construction, the medium at the working face cut by the cutterhead is complex, and the mixed slurry will cause the valve to jam and scour, which will seriously affect its sealing performance after long-term use, a connecting body 2 is symmetrically fixedly connected to both sides of the valve body 1. A ball 3 is set inside the valve body 1. A fixed shaft 31 is rotatably connected to the lower end of the ball 3. A steel ball 32 is set at the upper end of the fixed shaft 31 in contact with the ball 3. An upper valve shaft 36 is fixedly set at the upper end of the ball 3. A stuffing box 37 is set on the outside of the upper valve shaft 36. A sealing packing 39 is set between the stuffing box 37 and the upper valve shaft 36. A valve seat 4 is set between the connecting body 2 and the ball 3. A retaining ring 41 is set between one end of the valve seat 4 and the connecting body 2.

[0036] In summary, the improvement of this embodiment lies in:

[0037] The stable connection between the fixed shaft 31 and the bottom of the ball 3 prevents the ball 3 from shifting or tilting under the impact of high-pressure slurry, ensuring precise alignment of the rotation center of the ball 3 with the sealing surface of the valve seat 4. This effectively avoids sealing failure caused by misalignment of the ball 3 and the upper valve shaft 36, increasing the positional accuracy of the ball 3. Furthermore, the top of the fixed shaft 31 contacts the ball 3 at the connection point through the steel ball 32. The rolling characteristics of the steel ball 32 reduce wear at the connection point between the ball 3 and the fixed shaft 31. In addition, when the valve is affected by temperature changes or pressure fluctuations, the steel ball 32 can absorb some of the deformation stress, preventing sealing failure caused by component deformation and enhancing the stability of the valve under complex operating conditions.

[0038] The sealing packing 39 between the upper valve shaft 36 and the stuffing box 37 forms an annular sealing band on the surface of the upper valve shaft 36, effectively preventing slurry leakage along the valve shaft. This design is particularly suitable for valves that are frequently opened and closed, maintaining sealing performance for a long time. It also prevents external impurities from entering the valve, and the elastic properties of the sealing packing 39 can automatically compensate for wear, maintaining the sealing effect.

[0039] As a key sealing component between the ball 3 and the connecting body 2, the valve seat 4 directly contacts the outer surface of the ball 3 to form the main sealing surface. The structural design of the valve seat 4 can adapt to the rotation of the ball 3, ensuring that the ball 3 and the valve seat 4 always maintain uniform contact during the opening and closing of the valve, avoiding sealing failure caused by excessive local stress. The retaining ring 41 can axially limit the valve seat 4, preventing the valve seat 4 from moving axially due to force when subjected to high pressure slurry impact or valve operation, ensuring that the sealing surface always maintains the correct contact position. Through the hard contact sealing between the valve seat 4 and the ball 3, plus the positioning and stabilizing effect of the retaining ring 41, the first core sealing defense line of the valve flow channel is formed, improving the sealing reliability.

[0040] Based on the above, other structures also need to be disclosed in detail, such as:

[0041] To simplify the assembly and maintenance of the ball valve structure and improve operability, the fixed shaft 31 and the stuffing box 37 are fixedly connected to the lower end of the valve body 1 by external screws, and the valve seat 4 is fixedly connected to one end of the connecting body 2 by bolts 42.

[0042] The screw connection is a detachable structure, which facilitates precise adjustment of the perpendicularity of the fixed shaft 31 and the clamping force of the stuffing box 37 during production and assembly, reducing the impact of assembly errors on sealing and rotation performance. When the steel ball 32 of the fixed shaft 31 wears or the sealing packing 39 of the stuffing box 37 ages, the parts can be quickly replaced by removing the screws without disassembling the entire valve body 1, reducing maintenance time and costs. The valve seat 4 is the main sealing mating component of the ball 3. After being fixed to the connecting body 2 by the bolt 42, it can ensure that the sealing surface of the valve seat 4 and the ball 3 always maintains uniform contact, avoiding displacement of the valve seat 4 due to slurry pressure fluctuations, and solving the problem of local wear and leakage of the sealing surface caused by unstable positioning of the traditional valve seat 4.

[0043] To further enhance the stability of the steel ball 32, a first screw 33 is provided at the bottom of the steel ball 32, a second screw 34 is provided at the bottom of the first screw 33, and a screw plug 35 is provided at the bottom of the second screw 34.

[0044] After prolonged use, the steel ball 32 may experience height deviation due to foundation settlement, component wear, load changes, etc., leading to decreased stability (such as tilting or wobbling). By adjusting the combination of the first screw 33, the second screw 34, and the plug 35 (e.g., by increasing or decreasing the thickness, rotating the threaded structure to adjust the height), the vertical position of the steel ball 32 can be corrected in real time, ensuring that it always remains at the preset height. This avoids problems such as uneven force caused by positional deviation, which could affect the sealing effect between the fixed shaft 31 and the ball 3.

[0045] In order to achieve the multi-stage sealing performance of the ball valve, O-rings 38 are provided between the outer side of the fixed shaft 31 and the ball 3, between the outer side of the fixed shaft 31 and the valve body 1, between the upper valve shaft 36 and the stuffing box 37, between the stuffing box 37 and the valve body 1, and at the contact surface between the valve seat 4 and the connecting body 2.

[0046] O-rings 38 are provided between multiple contact surfaces of the component connection, which can fill the gaps through compression deformation, preventing dust, liquid or impurities from leaking at the component connection gaps. They form a multi-level seal with other sealing structures in each component, which greatly reduces the risk of slurry leakage and solves the problem of unreliable sealing of traditional single-seal structures in high-pressure, high-particle slurry, further enhancing the sealing effect of the ball valve.

[0047] To enhance the internal load-bearing and protective capabilities of the ball valve, therefore... Figures 5-7 As shown, the inner sides (point A) of the connector 2, ball 3 and valve seat 4 are all coated with hard material, and the contact points (point B) between the outer surface of the ball 3 and the valve seat 4, as well as the contact points (point B) between one end of the valve seat 4 and the ball 3, are all coated with hard material.

[0048] When the slurry is conveyed through the inner sides of the connecting body 2, ball 3 and valve seat 4, the hard material sprayed on it can block the scouring and abrasion of the slurry particles on the inner wall of the pipeline. This avoids problems such as wall thickness reduction and leakage caused by direct wear of the substrate, enhances corrosion resistance and high temperature resistance, and extends the service life of the internal structure of the ball valve.

[0049] Because there is relative movement between the ball 3 and the valve seat 4, prolonged contact can easily lead to wear of the contact surface due to friction, which in turn can cause problems such as increased fit clearance, loose connection or reduced sealing performance. Hard materials (such as high-chromium cast iron or tungsten carbide weld overlay) have high hardness and strong wear resistance, which can form a "wear-resistant contact layer". The sliding friction between the ball 3 and the valve seat 4 only acts on the weld overlay layer, and the base material is almost undamaged, maintaining contact accuracy and fit stability.

[0050] In summary, the working principle of this solution is as follows:

[0051] This slurry ball valve, based on multi-stage sealing, achieves reliable operation under complex slurry conditions through the coordinated action of multiple components. The valve body 1 serves as the core load-bearing structure, with symmetrically fixed connecting bodies 2 on both sides forming a fluid channel. The internal ball 3 achieves stable rotation through the lower fixed shaft 31 and the upper valve shaft 36, thus completing the opening and closing control.

[0052] The stable connection between the fixed shaft 31 and the bottom of the ball 3, along with the steel ball 32 at its upper end, converts sliding friction into rolling friction, reducing rotational resistance. Simultaneously, the combination of the first screw 33, the second screw 34, and the plug 35 at the bottom ensures the steel ball 32 remains stable and in constant contact with the ball 3, preventing ball 3 from shifting and affecting the seal. A dynamic seal is formed between the upper valve shaft 36 and the sealing packing 39 via the stuffing box 37, preventing slurry leakage along the shaft. Both the fixed shaft 31 and the stuffing box 37 are fixed to the valve body 1 via external screws for easy maintenance and adjustment. The valve seat 4 between the ball 3 and the connecting body 2 forms the main sealing surface. The retaining ring 41 is axially limited and rigidly fixed with the bolt 42, preventing the valve seat 4 from shifting and ensuring uniform contact of the sealing surface. O-rings 38 on multiple contact surfaces of the component connections, along with other sealing structures in each component, form a multi-level sealing defense line, effectively blocking leakage paths.

[0053] During use, the hard material sprayed on the inner side provides wear-resistant and corrosion-resistant protection for the connector 2, ball 3, and valve seat 4, while the hard overlay layer at the contact point between ball 3 and valve seat 4 specifically resists dynamic friction and wear, extending the life of the core sealing surface. The detachable screw and bolt 42 connection design ensures assembly accuracy and facilitates component replacement and maintenance. Through the synergy of improved structural stability, multi-stage sealing reinforcement, and optimized wear resistance, safe and controllable transportation of high-concentration, high-particle slurries is achieved.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A slurry ball valve based on multi-stage sealing, comprising a valve body (1), characterized in that: The valve body (1) is symmetrically fixedly connected to the two sides of the connecting body (2). The valve body (1) is provided with a ball (3). The lower end of the ball (3) is rotatably connected to a fixed shaft (31). The upper end of the fixed shaft (31) is provided with a steel ball (32) at the contact position with the ball (3). The upper end of the ball (3) is fixedly provided with an upper valve shaft (36). The outer side of the upper valve shaft (36) is provided with a stuffing box (37). The stuffing box (37) and the upper valve shaft (36) are provided with a sealing packing (39). The connecting body (2) and the ball (3) are provided with a valve seat (4). One end of the valve seat (4) and the connecting body (2) are provided with a retaining ring (41).

2. The slurry ball valve based on multi-stage sealing according to claim 1, characterized in that: The fixed shaft (31) and stuffing box (37) are fixedly connected to the lower end of the valve body (1) by external screws.

3. The slurry ball valve based on multi-stage sealing according to claim 1, characterized in that: The bottom of the steel ball (32) is provided with a first screw (33), the bottom of the first screw (33) is provided with a second screw (34), and the bottom of the second screw (34) is provided with a screw plug (35).

4. The slurry ball valve based on multi-stage sealing according to claim 1, characterized in that: O-rings (38) are provided between the outer side of the fixed shaft (31) and the ball (3), between the outer side of the fixed shaft (31) and the valve body (1), between the upper valve shaft (36) and the stuffing box (37), between the stuffing box (37) and the valve body (1), and at the contact surface between the valve seat (4) and the connecting body (2).

5. The slurry ball valve based on multi-stage sealing according to claim 1, characterized in that: The valve seat (4) is fixedly connected to one end of the connecting body (2) by bolts (42).

6. The slurry ball valve based on multi-stage sealing according to claim 1, characterized in that: The inner sides of the connector (2), ball (3) and valve seat (4) are all coated with hard material. The contact position between the outer surface of the ball (3) and the valve seat (4), and the contact position between one end of the valve seat (4) and the ball (3) are all overlaid with hard material.

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