Long life split valve seat

Abstract

The application discloses a long-service-life split type valve seat, which comprises a bushing and a base, the bushing is embedded in the outlet end of the base, the bushing is used in cooperation with a valve body, and the bushing is made of tungsten carbide alloy. The valve seat is composed of the bushing and the base, the bushing is made of hard alloy material, the hardness, strength, wear resistance and corrosion resistance of the bushing are increased, and the service life of the valve seat is greatly prolonged; the valve seat is of a split type structure, once wear occurs, only the bushing or the base needs to be replaced, the whole valve seat does not need to be replaced, maintenance is convenient, time and labor are saved, and the production cost of oil and gas fields is reduced; the bushing can be selected in a proper diameter size according to the working pressure in actual working conditions, the conveying medium and the wear degree of the valve body on the valve seat, and has wide application range; the bushing and the base are of multiple shapes and can be combined according to actual working conditions, and have strong applicability.

Description

Technical Field

[0001] This invention relates to the field of plunger pump technology, and more specifically to a long-life split-type valve seat. Background Technology

[0002] Currently, fracturing is the primary method for increasing production in oil and gas field development. Plunger pumps are the main equipment for high-pressure pumping of fracturing media in these operations. With the continuous development of ultra-high pressure, ultra-deep wells, and horizontal wells in oil and gas fields, the operating conditions are becoming increasingly harsh, requiring high-pressure, high-volume operations. This is especially true in unconventional oil and gas operations—shale gas operations—where operating pressures can sometimes reach 120 MPa. These harsh conditions necessitate continuous, high-volume, and high-pressure operations, making plunger pump components more prone to wear. The linear reciprocating motion of the plunger in the plunger pump drives changes in pressure within the hydraulic valve chamber, resulting in the periodic opening and closing of the valve body. Because the valve body collides with the valve seat when closed, and high-pressure operations exacerbate this collision, the valve seat is highly susceptible to wear, corrosion, and breakage, leading to a short service life, poor wear resistance, and frequent replacement. Moreover, most of the valves used in oil and gas field production operations are currently integrally molded. Once wear occurs, the entire valve needs to be replaced, which is time-consuming and labor-intensive, affecting the progress of oil and gas field operations and increasing the operating costs of oil and gas fields. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a long-life, split-type valve seat. The valve seat consists of a bushing and a base. The bushing is made of hard alloy material, which increases the hardness, strength, wear resistance, and corrosion resistance of the bushing, greatly extending the service life of the valve seat. The valve seat has a split structure, so once wear occurs, only the bushing or the base needs to be replaced, without replacing the entire unit. This makes maintenance convenient, saves time and effort, and reduces production costs in oil and gas fields. The bushing can be selected with a suitable diameter based on parameters such as working pressure, transported medium, and the degree of wear of the valve body on the valve seat under actual working conditions, making it widely applicable. Both the bushing and the base come in various shapes and can be combined according to actual working conditions, making it highly adaptable.

[0004] The objective of this invention is achieved through the following technical measures: a long-life split-type valve seat, comprising a bushing and a base, wherein the bushing is embedded in the outlet end of the base, the bushing is used in conjunction with the valve body, and the bushing is made of tungsten carbide alloy.

[0005] Furthermore, the tungsten carbide alloy includes nickel-based tungsten carbide or cobalt-based tungsten carbide.

[0006] Furthermore, the bushing is a cylindrical structure or a frustum structure. When it is a frustum structure, the diameter of the upper bottom surface of the bushing is larger than the diameter of the lower bottom surface. A first through hole is opened in the bushing. The first through hole includes a first frustum through hole and a first cylindrical through hole that are connected sequentially from top to bottom. The diameter of the upper bottom surface of the first frustum through hole is larger than the diameter of the lower bottom surface, and the diameter of the lower bottom surface of the first frustum through hole is the same as the diameter of the first cylindrical through hole.

[0007] Furthermore, when the bushing has a frustum structure, the taper of the bushing is 1:8-1:16.

[0008] Furthermore, the contact surface between the valve and the bushing is the working surface of the valve, and the diameter of the upper bottom surface of the first frustum through hole is the same as the maximum diameter of the working surface of the valve or the same as the maximum outer diameter of the valve rubber.

[0009] Furthermore, the base is a frustum-shaped structure or a T-shaped structure. When it is a frustum-shaped structure, the diameter of the upper base is larger than the diameter of the lower base. When it is a T-shaped structure, the base includes a cylindrical head and a frustum tail connected sequentially from top to bottom. The diameter of the upper base of the frustum tail is larger than the diameter of the lower base, and the diameter of the cylindrical head is larger than the diameter of the upper base of the frustum tail.

[0010] Furthermore, the base has a second through hole, which includes a second frustum through hole, a bushing insertion hole, and a second cylindrical through hole that are connected sequentially from top to bottom. The diameter of the upper bottom surface of the second frustum through hole is larger than the diameter of the lower bottom surface, and the minimum diameter of the bushing insertion hole is larger than the diameter of the second cylindrical through hole. When the bushing is embedded in the base, the conical surface of the second frustum through hole is flush with the conical surface of the first frustum through hole, and the side surface of the first cylindrical through hole is flush with the side surface of the second cylindrical through hole.

[0011] Furthermore, the base has a second through hole, which includes a bushing insertion hole and a second cylindrical through hole that are connected sequentially from top to bottom. The minimum diameter of the bushing insertion hole is greater than the diameter of the second cylindrical through hole. When the bushing is inserted into the base, the side of the first cylindrical through hole is flush with the side of the second cylindrical through hole.

[0012] Furthermore, the base has an annular groove formed on the platform of the bushing insertion hole and the second cylindrical through hole, and an O-ring is provided in the annular groove.

[0013] Compared with the prior art, the beneficial effects of this invention are as follows: This long-life split-type valve seat consists of a bushing and a base. The bushing is made of hard alloy material, which increases the hardness, strength, wear resistance, and corrosion resistance of the bushing, greatly extending the service life of the valve seat. The valve seat has a split structure, so once wear occurs, only the bushing or the base needs to be replaced, without replacing the whole unit, which is convenient for maintenance, saves time and effort, and reduces the production cost of oil and gas fields. The bushing can be selected with a suitable diameter according to parameters such as working pressure, conveying medium, and the degree of wear of the valve body on the valve seat under actual working conditions, making it widely applicable. Both the bushing and the base are available in various shapes and can be combined according to actual working conditions, making it highly adaptable.

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the bushing and base assembly.

[0016] Figure 2 This is a structural schematic diagram of the bushing and base assembly.

[0017] Figure 3 This is a structural schematic diagram of the bushing and base assembly.

[0018] Figure 4 This is a schematic diagram of a cylindrical bushing structure.

[0019] Figure 5 This is a structural diagram of a frustum bushing.

[0020] Figure 6 This is a schematic diagram of the T-shaped base structure.

[0021] Figure 7 This is a schematic diagram of the second T-shaped base structure.

[0022] Figure 8 This is a schematic diagram of the T-shaped base structure three.

[0023] Figure 9 This is a schematic diagram of the T-shaped base structure four.

[0024] Figure 10 This is a schematic diagram of the T-shaped base structure five.

[0025] Figure 11 This is a schematic diagram of the T-shaped base structure six.

[0026] Among them, 1. valve body, 2. valve rubber, 3. bushing, 4. base, 5. first frustum through hole, 6. first cylinder through hole, 7. second frustum through hole, 8. bushing insertion hole, 9. second cylinder through hole, 10. annular groove, 11. O-ring. Detailed Implementation

[0027] like Figures 1 to 11 As shown, a long-life split-type valve seat includes a bushing 3 and a base 4. The bushing 3 is embedded in the outlet end of the base 4 and is used in conjunction with the valve body 1. The bushing 3 is made of tungsten carbide alloy. More preferably, the tungsten carbide alloy includes nickel-based tungsten carbide or cobalt-based tungsten carbide. The valve seat consists of a bushing 3 and a base 4. The valve seat has a split structure, so once wear occurs, only the bushing 3 or the base 4 needs to be replaced, without replacing the whole unit, which is convenient for maintenance and saves time and effort. The bushing 3 is made of hard alloy material, which increases the hardness, strength, wear resistance and corrosion resistance of the bushing 3, greatly extending the service life of the valve seat. The base 4 can be made of ordinary alloy steel material, which effectively reduces damage to the valve seat and reduces the production cost of oil and gas fields.

[0028] The bushing 3 is a cylindrical or frustum-shaped structure. The bushing 3 has a first through hole, which includes a first frustum-shaped through hole 5 and a first cylindrical through hole 6 connected sequentially from top to bottom. The diameter of the upper base of the first frustum-shaped through hole 5 is larger than the diameter of its lower base, and the diameter of the lower base of the first frustum-shaped through hole 5 is the same as the diameter of the first cylindrical through hole 6. A valve 1 can be inserted into the bushing 3 through the first through hole, and the valve contacts the conical surface of the first frustum-shaped through hole 5 during operation. More preferably, when the bushing 3 is a frustum-shaped structure, the taper of the bushing 3 is 1:8-1:16. The bushing 3 can be assembled with the base 4 using an interference fit method. When the bushing 3 is a cylindrical structure, a temperature difference method is preferred for assembling the bushing and the base 4. When the bushing 3 is a frustum-shaped structure, a press-fit method is preferred for assembling the bushing 3 and the base 4. Different structural forms of the bushing 3 can be selected according to the actual working conditions.

[0029] The contact surface between the valve body 1 and the bushing 3 is the working surface of the valve body 1. The diameter of the upper bottom surface of the first frustum-shaped through hole 5 is the same as the maximum diameter of the working surface of the valve body 1 or the same as the maximum outer diameter of the valve rubber 2. When the valve body 1 is working, it will cause the valve rubber 2 to collide with the valve seat. When the diameter of the upper bottom surface of the first frustum-shaped through hole 5 is the same as the maximum diameter of the working surface of the valve body 1, the bushing 3 only contacts the valve body 1 and not the valve rubber 2. At this time, the valve body 1 collides with the bushing 3, and the valve rubber 2 collides with the base 4, causing wear on both the bushing 3 and the base 4. When the diameter of the upper bottom surface of the first frustum-shaped through hole 5 is the same as the maximum outer diameter of the valve rubber 2, the bushing 3 contacts both the valve body 1 and the valve rubber 2. At this time, both the valve body 1 and the valve rubber 2 collide with the bushing 3, causing wear on the bushing 3. In practical work, the appropriate bushing diameter can be selected based on factors such as operating pressure and oil and gas field operating costs.

[0030] The base 3 has a frustum-shaped or T-shaped structure. When it is a frustum-shaped structure, the diameter of the upper base surface of the base 3 is larger than the diameter of the lower base surface. When it is a T-shaped structure, the base 3 includes a cylindrical head and a frustum-shaped tail connected sequentially from top to bottom. The diameter of the upper base surface of the frustum-shaped tail is larger than the diameter of the lower base surface, and the diameter of the cylindrical head is larger than the diameter of the upper base surface of the frustum-shaped tail. In actual operation, different shapes of base 3 can be selected according to the structure of the hydraulic end valve box of the plunger pump.

[0031] The base 4 has a second through hole, which includes a second frustum-shaped through hole 7, a bushing insertion hole 8, and a second cylindrical through hole 9 connected sequentially from top to bottom. The shape of the bushing insertion hole 8 matches the shape of the bushing 3. The diameter of the upper bottom surface of the second frustum-shaped through hole 7 is larger than the diameter of the lower bottom surface, and the minimum diameter of the bushing insertion hole 8 is larger than the diameter of the second cylindrical through hole 9. When the bushing 3 is embedded in the base 4, the conical surface of the second frustum-shaped through hole 7 is flush with the conical surface of the first frustum-shaped through hole 5, and the side surface of the first cylindrical through hole 6 is flush with the side surface of the second cylindrical through hole 9. Specifically, this type of base 4 is preferably used in conjunction with a bushing 3 whose maximum diameter of the first frustum-shaped through hole 5 is the same as the maximum diameter of the working surface of the valve body 2. When the valve body 2 is closed, the flushness of the conical surface of the second frustum-shaped through hole 7 with the conical surface of the first frustum-shaped through hole 5 can effectively ensure the sealing performance between the valve body 1 and the valve rubber 2 and the valve seat. The side of the first cylindrical through hole 6 is flush with the side of the second cylindrical through hole 7, which ensures that the valve body 1 can move up and down inside the valve seat without obstruction.

[0032] The base 4 has a second through hole, which includes a bushing insertion hole 8 and a second cylindrical through hole 9 connected sequentially from top to bottom. The shape of the bushing insertion hole 8 matches the shape of the bushing 3. The minimum diameter of the bushing insertion hole 8 is larger than the diameter of the second cylindrical through hole 9. When the bushing 3 is inserted into the base 4, the side of the first cylindrical through hole 5 is flush with the side of the second cylindrical through hole 9. Specifically, this type of base 4 is preferably used in conjunction with a bushing 3 whose maximum diameter of the first frustum through hole 5 is the same as the maximum outer diameter of the valve 2, ensuring that the valve 1 can move up and down unimpeded within the valve seat.

[0033] The base 4 also has an annular groove 10 formed on the platform formed by the bushing insertion hole 8 and the second cylindrical through hole 9, and an O-ring 11 is provided in the annular groove 10. The O-ring 11 can increase the sealing performance of the bushing 3 and the base 4.

[0034] The structural characteristics of the bushing 3 and the base 4 in this invention include the shape of the bushing 3, the size of the bushing 3, the shape of the base 4, and the structure of the second through hole in the base 4. The bushing 3 has two shapes: a cylindrical structure or a frustum structure. The bushing 3 has two sizes: the maximum diameter of the bushing 3 is equal to the maximum diameter of the working surface of the valve 2 or the maximum diameter of the bushing 3 is equal to the maximum outer diameter of the valve rubber 2. The base 4 has two shapes: a frustum structure or a T-shaped structure. The second through hole in the base 4 has two structures: a second frustum through hole 7 - bushing insertion hole 8 - second cylindrical through hole 9 or a bushing insertion hole 8 - second cylindrical through hole 9. In this invention, the shape of the bushing insertion hole 8 must match the shape of the bushing 3. When the maximum diameter of the bushing 3 is equal to the maximum diameter of the working surface of the valve 1, the structure of the second through hole in the base 4 matching the bushing 3 must be a second frustum through hole 7 - bushing insertion hole 8 - second cylindrical through hole 9. When the maximum diameter of the bushing 3 is equal to the maximum outer diameter of the valve rubber 2, the structure of the second through hole in the base 4 matching the bushing 3 must be a bushing insertion hole 8 - second cylindrical through hole 9. In addition to the above-mentioned structural characteristics that require fixed matching, other structural characteristics in this invention can be freely combined according to actual needs. Only three of these combinations are listed below.

[0035] Example 1

[0036] like Figure 1As shown, a long-life split-type valve seat includes a bushing 3 and a base 4. The bushing 3 is embedded in the outlet end of the base 4 and is used in conjunction with the valve body 1. The bushing 3 is made of tungsten carbide alloy. More preferably, the tungsten carbide alloy includes nickel-based tungsten carbide or cobalt-based tungsten carbide. The bushing 3 has a cylindrical structure, and the base 4 has a T-shaped structure. The base 4 includes a cylindrical head and a frustum tail connected sequentially from top to bottom. The diameter of the upper base of the frustum tail is larger than the diameter of the lower base. The diameter of the cylindrical head is larger than the diameter of the upper base of the frustum tail. A first through hole is formed in the bushing 3. The first through hole includes a first frustum through hole 5 and a first cylindrical through hole 6 connected sequentially from top to bottom. The diameter of the upper base of the first frustum through hole 5 is larger than the diameter of the lower base. The diameter of the lower base of the first frustum through hole 5 is the same as the diameter of the first cylindrical through hole 6. The bushing 3 is assembled with the base 4 using a temperature difference method. The diameter of the upper bottom surface of the first frustum-shaped through hole 5 of the bushing 3 is the same as the maximum diameter of the working surface of the valve 1. The base 4 has a second through hole, which includes a second frustum-shaped through hole 7, a bushing insertion hole 8, and a second cylindrical through hole 9 connected sequentially from top to bottom. The bushing insertion hole 8 is a cylindrical hole. The diameter of the upper bottom surface of the second frustum-shaped through hole 7 is larger than the diameter of the lower bottom surface. The diameter of the bushing insertion hole 8 is larger than the diameter of the second cylindrical through hole 9. When the bushing 3 is embedded in the base 4, the conical surface of the second frustum-shaped through hole 7 is flush with the conical surface of the first frustum-shaped through hole 5, and the side surface of the first cylindrical through hole 5 is flush with the side surface of the second cylindrical through hole 7.

[0037] Example 2

[0038] like Figure 2 As shown, a long-life split-type valve seat differs from Embodiment 1 in that the bushing 3 has a frustum structure, and the diameter of the upper bottom surface of the first frustum through hole 5 of the bushing 3 is the same as the maximum outer diameter of the valve rubber 2. The bushing 3 is assembled with the base 4 by a press-fit method. The second through hole includes a bushing insertion hole 8 and a second cylindrical through hole 9 connected sequentially from top to bottom. The bushing insertion hole 8 is frustum shaped, and the diameter of the upper bottom surface of the bushing insertion hole 8 is larger than the diameter of the lower bottom surface. The diameter of the lower bottom surface of the bushing insertion hole 8 is larger than the diameter of the second cylindrical through hole 9. The base 4 also has an annular groove 10 formed on the frustum surface of the bushing insertion hole 8 and the second cylindrical through hole 9, and an O-ring 11 is provided in the annular groove 10.

[0039] Example 3

[0040] like Figure 3 As shown, a long-life split-type valve seat differs from Embodiment 1 in that the base 4 has a frustum-shaped structure, and the diameter of the upper bottom surface of the base is larger than the diameter of the lower bottom surface.

[0041] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A long-life split-type valve seat, characterized in that: The device includes a bushing and a base. The bushing is embedded in the outlet end of the base and is used in conjunction with a valve. The bushing is made of tungsten carbide alloy. A first through hole is formed in the bushing. The first through hole includes a first frustum through hole and a first cylindrical through hole that are connected sequentially from top to bottom. The diameter of the upper bottom surface of the first frustum through hole is larger than the diameter of the lower bottom surface, and the diameter of the lower bottom surface of the first frustum through hole is the same as the diameter of the first cylindrical through hole. The base has a second through hole, which includes a second frustum through hole, a bushing insertion hole, and a second cylindrical through hole connected sequentially from top to bottom. The diameter of the upper bottom surface of the second frustum through hole is larger than the diameter of the lower bottom surface, and the minimum diameter of the bushing insertion hole is larger than the diameter of the second cylindrical through hole. When the bushing is embedded in the base, the conical surface of the second frustum through hole is flush with the conical surface of the first frustum through hole, and the side surface of the first cylindrical through hole is flush with the side surface of the second cylindrical through hole. Alternatively, the base has a second through hole, which includes a bushing insertion hole and a second cylindrical through hole connected sequentially from top to bottom. The minimum diameter of the bushing insertion hole is larger than the diameter of the second cylindrical through hole, and when the bushing is embedded in the base, the side surface of the first cylindrical through hole is flush with the side surface of the second cylindrical through hole.

2. The long-life split-type valve seat according to claim 1, characterized in that: The tungsten carbide alloy includes nickel-based tungsten carbide or cobalt-based tungsten carbide.

3. The long-life split-type valve seat according to claim 1 or 2, characterized in that: The bushing is a cylindrical structure or a frustum structure. When it is a frustum structure, the diameter of the upper base of the bushing is larger than the diameter of the lower base.

4. The long-life split-type valve seat according to claim 3, characterized in that: When the bushing is a frustum structure, the taper of the bushing is 1:8-1:

16.

5. The long-life split-type valve seat according to claim 3, characterized in that: The contact surface between the valve and the bushing is the working surface of the valve. The diameter of the upper bottom surface of the first frustum through hole is the same as the maximum diameter of the working surface of the valve or the same as the maximum outer diameter of the valve rubber.

6. The long-life split-type valve seat according to claim 5, characterized in that: The base is a frustum-shaped structure or a T-shaped structure. When it is a frustum-shaped structure, the diameter of the upper base is larger than the diameter of the lower base. When it is a T-shaped structure, the base includes a cylindrical head and a frustum tail connected sequentially from top to bottom. The diameter of the upper base of the frustum tail is larger than the diameter of the lower base, and the diameter of the cylindrical head is larger than the diameter of the upper base of the frustum tail.

7. The long-life split-type valve seat according to claim 1, characterized in that: The base also has an annular groove on the platform formed by the bushing insertion hole and the second cylindrical through hole, and an O-ring is provided in the annular groove.

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