A wear resistant one-way valve for a fracturing pumping system

Abstract

The utility model discloses a kind of wear-resistant one-way valve for fracturing pumping system, including central shaft sealing body assembly, nozzle barrel assembly and valve body, central shaft sealing body assembly is composed of central shaft, central shaft sealing ring, tungsten carbide hard seal ring, elastomer compensating ring and central shaft sealing body;Nozzle barrel assembly is composed of nozzle barrel body, nozzle barrel nut, guide block, nozzle barrel sealing ring, nozzle and clasp spring, tungsten carbide hard seal ring and elastomer compensating ring are assembled on central shaft sealing body, connect with central shaft by thread, central shaft sealing ring is set on central shaft, central shaft sealing body assembly is placed in nozzle barrel body, install reset spring, then nozzle barrel nut is fastened with nozzle barrel body by thread, then valve body is sleeved on nozzle barrel assembly, install guide block, nozzle barrel body can only linear motion in valve body guide groove at this time.

Description

Technical Field

[0001] This utility model belongs to the technical field of oilfield high-pressure fluid control equipment, specifically relating to a wear-resistant one-way valve for fracturing pumping systems. Background Technology

[0002] With the continuous improvement of sand fracturing and acid fracturing technologies and the increasing depth of oil and gas wells, fracturing pumps are increasingly developing towards larger displacement, higher pressure, and higher power. One-way valves are a crucial component in maintaining the high displacement, high pressure, and high power of fracturing pumps. A one-way valve, also known as a check valve, is a directional control valve that allows fluid to flow in only one direction and not in the opposite direction. One-way valves are widely used in various pneumatic and hydraulic control systems. In different systems, the working pressure, opening pressure, flow resistance, and reverse sealing requirements of one-way valves vary. Their sealing performance is a critical indicator that one-way valves must guarantee.

[0003] Existing one-way valves suffer severe wear on their sealing surfaces in sandy media, with an average lifespan of only 80-120 hours. Furthermore, conventional hard alloy sealing rings cannot compensate for the wear gaps, resulting in increasingly poor sealing performance. Therefore, developing a new type of wear-resistant one-way valve has great market potential. Utility Model Content

[0004] The purpose of this invention is to solve the problems of the prior art and provide a wear-resistant one-way valve for fracturing pumping systems.

[0005] To solve the technical problem, the technical solution of this utility model is: a wear-resistant one-way valve for a fracturing pumping system, including a central shaft, valve body, nozzle cylinder nut, nozzle cylinder body, guide block, return spring, sealing ring, elastomer compensation ring, nozzle and central shaft sealing body; The central shaft sealing sleeve is installed inside the nozzle cylinder, and a return spring is installed between the central shaft and the nozzle cylinder. A nozzle cylinder nut is also installed on the outer wall of the central shaft, and the nozzle cylinder nut is fixedly connected to one end of the nozzle cylinder. The central shaft is fixedly connected to a central shaft sealing body at one end away from the nozzle cylinder nut. An elastic body compensation ring and a sealing ring are fitted on the outer wall of the other end of the central shaft sealing body. The elastic body compensation ring is installed in conjunction with the nozzle nozzle at the nozzle outlet. A nozzle is provided near the nozzle outlet of the nozzle cylinder. The nozzle cylinder sealing sleeve is installed inside the valve body, and the end of the central shaft away from the central shaft sealing body passes through the nozzle cylinder and the valve body in sequence. The valve body has a guide groove along the axial direction on its outer wall, and a guide block is fixedly installed on the outer wall of the nozzle cylinder. The guide block only moves in a straight line along the guide groove. The central shaft, nozzle cylinder, and central shaft seal form an overflow space at the overflow port of the central shaft seal. The overflow medium enters the overflow space from the overflow port, causing the nozzle cylinder to move axially, thereby opening the nozzle.

[0006] Preferably, the central shaft seal body has multiple overflow ports circumferentially, and the central shaft, nozzle cylinder and central shaft seal body form an annular overflow space at the overflow ports of the central shaft seal body. An elastic body compensation ring and a sealing ring are sequentially fitted on the central shaft seal body in front of the overflow ports.

[0007] Preferably, the nozzle has a conical structure, the elastomer compensation ring has a conical structure adapted to the nozzle, and the axial dimension of the elastomer compensation ring is larger than the axial dimension of the nozzle.

[0008] Preferably, the sealing ring is a tungsten carbide hard sealing ring, and the diameter of the tungsten carbide hard sealing ring is larger than the maximum size of the nozzle.

[0009] Preferably, the central shaft seal is threaded to one end of the central shaft, and the nozzle cylinder nut is threaded to one end of the nozzle cylinder.

[0010] Preferably, a sealing groove is provided on the outer wall of the central shaft near the overflow space, and a central shaft sealing ring is installed in the sealing groove to seal the central shaft and the nozzle cylinder.

[0011] Preferably, a sealing groove is provided on the outer wall of the nozzle cylinder, and a nozzle cylinder sealing ring is installed in the sealing groove to seal the valve body and the nozzle cylinder together.

[0012] Preferably, a retaining spring is provided on the nozzle cylinder near the nozzle.

[0013] Preferably, the outer wall of the nozzle cylinder is provided with four guide block mounting grooves in the circumferential direction, and the guide blocks pass through the guide grooves and are fixedly installed in the guide block mounting grooves.

[0014] Compared with the prior art, the advantages of this utility model are: (1) This utility model proposes a wear-resistant one-way valve for fracturing pumping system. The outer wall of the central shaft seal is fitted with an elastic body compensation ring and a sealing ring. The elastic body compensation ring has a conical structure and is installed at the nozzle of the nozzle body. This application uses a sealing ring and an elastic body compensation ring for double-stage sealing, which improves the sealing effect. (2) After the fracturing pumping is completed, the return spring and the fracturing fluid exert a rightward force on the nozzle cylinder, so that the conical nozzle of the nozzle cylinder is combined with the elastic body compensation ring and the tungsten carbide hard sealing ring to achieve the one-way valve sealing; when the sealing surface is worn, the elastic body compensation ring compensates for the worn part and the wear gap, and can still maintain good sealing performance. (3) The valve body of this utility model has a guide groove along the axial direction on the outer wall of the valve body and a guide block is fixedly installed on the outer wall of the nozzle cylinder. The guide block only moves in a straight line along the guide groove. The relative position of the valve body and the nozzle cylinder is limited by the straight line movement of the guide block in the guide groove, ensuring the opening and closing of the nozzle. The movable seal is achieved by the central shaft sealing ring and the nozzle cylinder sealing ring. Attached Figure Description

[0015] Figure 1 This is an exploded view of a wear-resistant one-way valve for a fracturing pumping system according to this utility model. Figure 2 This is a cross-sectional view of a wear-resistant one-way valve for a fracturing pumping system according to the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Central shaft, 2. Valve body, 3. Nozzle cylinder nut, 4. Nozzle cylinder body, 5. Guide block, 6. Return spring, 7. Sealing ring, 8. Elastomer compensation ring, 9. Nozzle cylinder sealing ring, 10. Nozzle, 11. Snap ring, 12. Central shaft sealing body, 13. Central shaft sealing ring; 2-1. Guide groove; 4-1. Nozzle; 4-2. Guide block mounting groove; 12-1. Overflow outlet. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to these embodiments. The present invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To provide the public with a thorough understanding of the present invention, specific details are described in detail in the following embodiments, but those skilled in the art will fully understand the present invention even without these details.

[0018] Example 1 like Figures 1-2 As shown, this utility model discloses a wear-resistant one-way valve for a fracturing pumping system, including a central shaft 1, a valve body 2, a nozzle cylinder nut 3, a nozzle cylinder 4, a guide block 5, a return spring 6, a sealing ring 7, an elastomer compensation ring 8, a nozzle 10, and a central shaft sealing body 12. The central shaft 1 is sealed inside the nozzle cylinder 4, and a return spring 6 is fitted between the central shaft 1 and the nozzle cylinder 4. A nozzle cylinder nut 3 is also fitted on the outer wall of the central shaft 1, and the nozzle cylinder nut 3 is fixedly connected to one end of the nozzle cylinder 4. The central shaft 1 is fixedly connected to a central shaft sealing body 12 at one end away from the nozzle cylinder nut 3. An elastic body compensation ring 8 and a sealing ring 7 are fitted on the outer wall of the other end of the central shaft sealing body 12. The elastic body compensation ring 8 is installed in conjunction with the nozzle 4-1 at the nozzle cylinder 4. A nozzle 10 is provided on the nozzle cylinder 4 near the nozzle 4-1. The nozzle cylinder 4 is sealed inside the valve body 2, and the end of the central shaft 1 away from the central shaft sealing body 12 passes through the nozzle cylinder 4 and the valve body 2 in sequence. The outer wall of the valve body 2 is provided with a guide groove 2-1 along the axial direction, and a guide block 5 is fixedly installed on the outer wall of the nozzle cylinder 4. The guide block 5 only moves in a straight line along the guide groove 2-1. The central shaft 1, nozzle cylinder 4 and central shaft seal 12 form an overflow space at the overflow port 12-1 of the central shaft seal 12. The overflow medium enters the overflow space from the overflow port 12-1, causing the nozzle cylinder 4 to move axially, thereby opening the nozzle 4-1.

[0019] Example 2 like Figure 1 As shown, preferably, the central shaft seal 12 has multiple overflow ports 12-1 circumferentially opened. The central shaft 1, the nozzle cylinder 4 and the central shaft seal 12 form an annular overflow space at the overflow ports 12-1 of the central shaft seal 12. An elastic body compensation ring 8 and a sealing ring 7 are sequentially fitted on the central shaft seal 12 in front of the overflow ports 12-1.

[0020] like Figure 2 As shown, preferably, the nozzle 4-1 has a conical structure, the elastomer compensation ring 8 has a conical structure adapted to the nozzle 4-1, and the axial dimension of the elastomer compensation ring 8 is larger than the axial dimension of the nozzle 4-1.

[0021] Preferably, the sealing ring 7 is a tungsten carbide hard sealing ring, and the diameter of the tungsten carbide hard sealing ring is larger than the maximum size of the nozzle 4-1.

[0022] Preferably, the central shaft seal 12 is threaded to one end of the central shaft 1, and the nozzle cylinder nut 3 is threaded to one end of the nozzle cylinder 4.

[0023] This utility model has a dual-stage sealing structure: Primary seal: Tungsten carbide hard sealing ring (hardness ≥90HRA); Secondary seal: Elastomer compensation ring (fluororubber + graphite filler), which can deform axially by 0.5~2mm.

[0024] Example 3 like Figures 1-2As shown, preferably, a sealing groove is provided on the outer wall of the central shaft 1 near the overflow space, and a central shaft sealing ring 13 is installed in the sealing groove to seal the central shaft 1 and the nozzle cylinder 4.

[0025] like Figures 1-2 As shown, preferably, a sealing groove is provided on the outer wall of the nozzle cylinder 4, and a nozzle cylinder sealing ring 9 is installed in the sealing groove to seal the valve body 2 and the nozzle cylinder 4 together.

[0026] like Figures 1-2 As shown, preferably, a retaining ring 11 is provided on the nozzle cylinder 4 near the nozzle 10.

[0027] The nozzle 10 is locked by a snap ring 11, allowing it to be replaced without disassembling the valve body.

[0028] like Figure 1 As shown, preferably, the outer wall of the nozzle cylinder 4 is provided with four guide block mounting grooves 4-2, and the guide block 5 passes through the guide groove 2-1 and is fixedly installed in the guide block mounting groove 4-2.

[0029] The nozzle body 4 has four guide blocks 5 at its tail end, forming a cross-shaped guide wing, which cooperates with the four guide block mounting slots 4-2.

[0030] After the guide block mounting groove 4-2 and the guide block 5 are assembled, they achieve guidance and anti-deviation, and also limit the relative position of the valve body 2 and the nozzle cylinder 4.

[0031] The working principle of this utility model is as follows: like Figures 1-2 As shown, this utility model discloses a wear-resistant one-way valve for a fracturing pumping system, including a central shaft sealing body assembly, a nozzle cylinder assembly, and a valve body. The central shaft sealing body assembly consists of a central shaft 1, a central shaft sealing ring 13, a tungsten carbide hard sealing ring 7, an elastomer compensation ring 8, and a central shaft sealing body 12. The nozzle cylinder assembly consists of a nozzle cylinder nut 3, a nozzle cylinder 4, a guide block 5, a nozzle cylinder sealing ring 9, a nozzle 10, and a retaining ring 11. The tungsten carbide hard sealing ring 7 and the elastomer compensation ring 8 are assembled on the central shaft sealing body 12 and connected to the central shaft 1 by threads. The central shaft sealing ring 13 is set on the central shaft 1. The central shaft sealing body assembly is placed inside the nozzle cylinder 4, and a return spring 6 is installed. Then, the nozzle cylinder nut 3 is tightened to the nozzle cylinder 4 by threads. Then, the valve body 2 is fitted onto the nozzle cylinder assembly, and the guide block 5 is installed. At this time, the nozzle cylinder 4 can only move linearly within the valve body guide groove.

[0032] In use: Place the wear-resistant one-way valve of this fracturing pumping system in the fracturing nitrogen pipeline. The nitrogen flows through the inner hole of the central shaft 1 and reaches the overflow port 12-1 of the central shaft seal 12. Due to the isolation of the central shaft seal ring 13, as the pressure of the high-pressure nitrogen increases, it drives the nozzle cylinder 4 to slide to the left along the valve body 2 in the guide groove 2-1, causing the conical nozzle 4-1 of the nozzle cylinder 4 to disengage from the tungsten carbide hard sealing ring 7 and the elastic body compensation ring 8, thus releasing the seal. The high-pressure nitrogen flows through the nozzle 10 into the fracturing fluid. After the work is completed, as the nitrogen pressure decreases, under the rightward force of the return spring 6 and the fracturing fluid on the nozzle cylinder 4, the conical nozzle 4-1 of the nozzle cylinder 4 engages with the tungsten carbide hard sealing ring 7 and the elastic body compensation ring 8, achieving one-way valve sealing. As the sealing surface of the one-way valve wears, the elastic body compensation ring 8 compensates for the worn part under the support of the mud pressure, and can still maintain good sealing performance.

[0033] Experimental results show that the wear-resistant one-way valve of this fracturing pump system has a service life extended to 300 hours (under a sand ratio of 20%), and the sealing pressure is maintained above 35 MPa (after wear).

[0034] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0035] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A wear-resistant one-way valve for fracturing pumping systems, characterized in that: It includes a central shaft (1), valve body (2), nozzle cylinder nut (3), nozzle cylinder (4), guide block (5), return spring (6), sealing ring (7), elastomer compensation ring (8), nozzle (10) and central shaft seal (12). The central shaft (1) is sealed inside the nozzle cylinder (4), and a return spring (6) is fitted between the central shaft (1) and the nozzle cylinder (4). A nozzle cylinder nut (3) is also fitted on the outer wall of the central shaft (1), and the nozzle cylinder nut (3) is fixedly connected to one end of the nozzle cylinder (4). The central shaft (1) is fixedly connected to a central shaft seal (12) at one end away from the nozzle cylinder nut (3). An elastic body compensation ring (8) and a sealing ring (7) are fitted on the outer wall of the other end of the central shaft seal (12). The elastic body compensation ring (8) is installed in conjunction with the nozzle cylinder (4) at the nozzle port (4-1). A nozzle (10) is provided on the nozzle cylinder (4) near the nozzle port (4-1). The nozzle cylinder (4) is sealed inside the valve body (2), and the end of the central shaft (1) away from the central shaft seal (12) passes through the nozzle cylinder (4) and the valve body (2) in sequence. The valve body (2) has a guide groove (2-1) axially formed on its outer wall, and a guide block (5) is fixedly installed on the outer wall of the nozzle cylinder (4). The guide block (5) moves only in a straight line along the guide groove (2-1). The central shaft (1), nozzle cylinder (4) and central shaft seal (12) form an overflow space at the overflow port (12-1) of the central shaft seal (12). The overflow medium enters the overflow space from the overflow port (12-1) to make the nozzle cylinder (4) move axially, thereby opening the nozzle (4-1).

2. The wear-resistant one-way valve for a fracturing pumping system according to claim 1, characterized in that: The central shaft seal (12) has multiple overflow ports (12-1) circumferentially. The central shaft (1), nozzle cylinder (4) and central shaft seal (12) form an annular overflow space at the overflow port (12-1) of the central shaft seal (12). An elastic body compensation ring (8) and a sealing ring (7) are sequentially fitted on the central shaft seal (12) in front of the overflow port (12-1).

3. A wear-resistant one-way valve for a fracturing pumping system according to claim 2, characterized in that: The nozzle (4-1) has a conical structure, and the elastomer compensation ring (8) has a conical structure adapted to the nozzle (4-1), and the axial dimension of the elastomer compensation ring (8) is greater than the axial dimension of the nozzle (4-1).

4. A wear-resistant one-way valve for a fracturing pumping system according to claim 2, characterized in that: The sealing ring (7) is a tungsten carbide hard sealing ring, and the diameter of the tungsten carbide hard sealing ring is larger than the maximum size of the nozzle (4-1).

5. A wear-resistant one-way valve for a fracturing pumping system according to claim 1, characterized in that: The central shaft seal (12) is threaded to one end of the central shaft (1), and the nozzle cylinder nut (3) is threaded to one end of the nozzle cylinder (4).

6. A wear-resistant one-way valve for a fracturing pumping system according to claim 1, characterized in that: The outer wall of the central shaft (1) near the overflow space is provided with a sealing groove, and a central shaft sealing ring (13) is installed in the sealing groove to seal the central shaft (1) and the nozzle cylinder (4).

7. A wear-resistant one-way valve for a fracturing pumping system according to claim 1, characterized in that: The outer wall of the nozzle cylinder (4) is provided with a sealing groove, and a nozzle cylinder sealing ring (9) is installed in the sealing groove to make the valve body (2) and the nozzle cylinder (4) a sealed assembly.

8. A wear-resistant one-way valve for a fracturing pumping system according to claim 1, characterized in that: A retaining ring (11) is provided on the nozzle cylinder (4) near the nozzle (10).

9. A wear-resistant one-way valve for a fracturing pumping system according to claim 1, characterized in that: The nozzle cylinder (4) has four guide block mounting slots (4-2) circumferentially arranged on its outer wall. The guide block (5) passes through the guide slot (2-1) and is fixedly installed in the guide block mounting slot (4-2).

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