Valve disc of slurry pump

Abstract

The utility model provides a valve disc of a slurry pump. The valve disc comprises a valve disc main body 1, a valve disc shaft 5 and a fastening nut 4, a hole-shaped structure matched with the valve disc shaft 5 is arranged in the center of the valve disc body 1, the valve disc shaft 5 penetrates through the hole-shaped structure of the valve disc body 1, and a fastening nut 4 is installed on the valve disc shaft 5 on the upper portion of the valve disc body 1. The scheme provided by the utility model has the following beneficial effects that the valve disc is kept to have the sealing performance of wear resistance and erosion resistance, and the flexibility of impact resistance of the valve disc is improved; the service life of the product is prolonged, the product quality is improved, and good social benefits are gained; product blank forming difficulty is reduced, and efficiency is improved; the product machining difficulty is reduced, mechanization and automation are facilitated, and the product precision is improved; the reasonable matching shape of the contact surfaces of the valve disc and the valve seat not only plays a good sealing role, but also has an anti-abrasion self-repairing compensation function.

Description

Technical Field

[0001] The utility model is applicable to but not limited to the technical field of hydraulic inlet and outlet of pumps such as mud pumps, oil drilling pumps, marine pumps, etc., and in particular relates to a valve disc of a mud pump. Background Art

[0002] A part of the inlet and outlet valves of the hydraulic end of the mud pump is called a valve disc. The valve disc and the valve seat are installed together in a cavity of the hydraulic end, arranged in pairs, and opened and closed under the drive of the power end piston to meet the inlet and outlet of the fluid.

[0003] The sealing effect of the valve disc and the valve seat when closed causes a high pressure difference between the inside and outside of the hydraulic end, and even has to withstand a pressure difference of up to 51.7MPa. The valve disc is installed at the hydraulic end and used in conjunction with the valve seat installed at the hydraulic end to control the fluid entering or exiting the cavity formed by the hydraulic end. The movement of the valve disc is the separation and contact between the valve seat and the valve seat to complete the control of the fluid. When the valve disc is separated from the valve seat, the fluid enters or exits, and at this time it is subjected to high-speed scouring, corrosion, abrasion, cavitation and other destructive effects of the fluid. When the valve disc is in close contact with the valve seat, it blocks the fluid from entering or exiting. At this time, the contact surface is subjected to the huge stress, corrosion and other destructive effects of the fluid pressure difference formed inside and outside the hydraulic end. The fluid that the valve disc contacts is a harsh working condition of high temperature, high pressure, high speed, strong corrosiveness, containing high-hardness particles, moisture, easy crystallization, easy bonding, easy flash evaporation and other characteristics of gas, liquid and solid coexistence. The use conditions of the valve disc are extremely harsh, and the life of maintaining the function is very short. Some existing products are only more than 100 hours. The existing product combination structure is a soft seal type, as shown in 1, a valve disc body 1, a sealing rubber ring 2, and a nut 3.

[0004] The main problems of existing products:

[0005] 1. Products made of highly flexible materials have low hardness, poor wear and erosion resistance, and short service life.

[0006] Second, the size and shape of the existing hard seal overall structure change greatly, with the axial diameter changing by 4-8 times, making it difficult to manufacture and of poor quality, resulting in a short service life.

[0007] 3. Existing products with soft sealing structures of metal and rubber combination structures have problems such as poor rubber resistance to temperature, aging, compression, erosion and wear, and short service life. Summary of the invention

[0008] The main purpose of the utility model is to overcome the defects of the above-mentioned prior art and provide a valve disc of a mud pump, including a valve disc body 1, a valve disc shaft 5, and a fastening nut 4; a hole structure matching the valve disc shaft 5 is provided in the center of the valve disc body 1, the valve disc shaft 5 passes through the hole structure of the valve disc body 1, and a fastening nut 4 is installed on the valve disc shaft 5 at the upper part of the valve disc body 1.

[0009] More preferably, the portion where the valve disc shaft 5 is connected to the valve disc body 1 has a boss structure with a diameter larger than that of the valve disc shaft 5 , and the boss structure is embedded in the lower portion of the valve disc body 1 .

[0010] More preferably, the boss structure transitions to the arc surface of the lower guide portion of the valve disc shaft 5 .

[0011] More preferably, a sealing ring is provided at the portion where the valve disc body 1 contacts the valve disc shaft 5 .

[0012] More preferably, the valve disc body contact surface 6 and the valve seat contact surface 9 are coupled in pairs, and are in close contact to achieve sealing, and the contact surface is a frustum straight surface or an arc surface.

[0013] More preferably, a spring is provided on the upper part of the valve disc body 1 , one end of the spring is connected to the fastening nut 4 , and the other end of the spring is connected to the pump body guide sleeve 13 .

[0014] The beneficial effects of the solution of the utility model are as follows:

[0015] (1) It not only maintains the valve disc's wear-resistant and erosion-resistant sealing properties, but also improves the valve disc's impact-resistant flexibility;

[0016] (2) Extend product life, improve product quality, and achieve good social benefits;

[0017] (3) Reduce the difficulty of product blank forming and improve efficiency;

[0018] (4) Reduce the difficulty of product machining, facilitate mechanization and automation, and improve product precision;

[0019] (5) The reasonable matching shape of the contact surface between the valve disc and the valve seat not only plays a good sealing role, but also has anti-wear self-repair compensation function. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model will be further described in the form of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure.

[0021] Figure 1 Schematic diagram of existing products;

[0022] Figure 2A schematic diagram of the valve disc assembly structure of the utility model mud pump;

[0023] Figure 3 Schematic diagram of the valve disc assembly structure of the utility model mud pump;

[0024] Figure 4 Schematic diagram of the application installed on the pump when it is turned on;

[0025] Figure 5 Schematic diagram of the closed state of the application installed on the pump. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the utility model. The technical features of each embodiment can be combined with each other to form a practical solution to achieve the purpose of the invention. For ordinary technicians in this field, the utility model can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0027] It should be understood that the "system" and "unit" used herein are a method for distinguishing different components, elements, parts, parts or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions. In addition, the "system" and "unit" can be implemented by software or hardware, and can be a physical or virtual name for the functional part.

[0028] The present invention uses a flow chart to illustrate the operations performed by the system according to the embodiments of the present invention. It should be understood that the preceding or following operations are not necessarily performed precisely in order. On the contrary, the various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes. The technical solutions in the various embodiments may be combined with each other to achieve the purpose of the present invention.

[0029] The utility model is applied to the one-way valve of the fluid suction port and discharge port of the hydraulic end of various mud pumps, oil drilling pumps, marine pumps, etc., and is used in conjunction with the valve seat as one of the opening and closing parts to complete the function of fluid transportation.

[0030] On the one hand, it meets the requirements of wear resistance, erosion resistance, high hardness and high strength performance, and on the other hand, it meets the requirements of high flexibility and high strength, improves the ability to adapt to various harsh working conditions, extends the service life of the product, and completely replaces the existing integral structure hard sealing valve disc and combined structure soft sealing valve disc.

[0031] like Figure 2 As shown, a valve disc of a mud pump. It includes a valve disc body 1, a valve disc shaft 5, and a fastening nut 4; a hole-shaped structure matching the valve disc shaft 5 is provided in the center of the valve disc body 1, and the valve disc shaft 5 passes through the hole-shaped structure of the valve disc body 1. The part where the valve disc shaft 5 is connected to the valve disc body 1 has a boss structure with a diameter larger than the valve disc shaft 5, and the boss structure is embedded in the lower part of the valve disc body 1. A fastening nut 4 is installed on the valve disc shaft 5 at the upper part of the valve disc body 1. The valve disc shaft 5 is fixedly connected to the valve disc body 1 through the boss structure embedded in the lower part of the valve disc body 1 and the fastening nut 4, so as to form a firm and reliable whole. After machining, a valve disc is formed to meet the requirements of reliable sealing, strong strength, and perfect performance. Connection methods such as threaded connection, welding, expansion connection, and bonding can be used.

[0032] The material of the valve disc body 1 can be selected from alloy steel, stainless steel, cast iron, cobalt-based alloy, ceramic and other materials, but not limited to the above materials. The molding method can be selected from casting, forging, welding, machining and other processing methods, but not limited to the above molding and processing methods. After appropriate heat treatment process, the product can achieve the required wear resistance, corrosion resistance, impact resistance, erosion resistance, cavitation resistance, high hardness, high strength and other properties.

[0033] The nut 4 serves to tighten the connection.

[0034] The valve disc shaft 5 plays a high-strength supporting and guiding role. The selection of suitable materials improves the flexibility of the valve disc shaft, and has high strength, impact resistance, and fracture resistance, thereby extending the life of the valve disc.

[0035] The material of the valve disc shaft 5 can be alloy steel, stainless steel, alloy and other materials, but not limited to the above materials, and its molding method can be casting, forging, welding, coating, machining and other processing methods. But not limited to the above molding and processing methods, after appropriate heat treatment process, the product can achieve the required high strength, corrosion resistance, impact resistance, good flexibility and other properties.

[0036] The boss structure and the lower guide portion of the valve disc shaft 5 have an arc surface transition, which facilitates the passage of fluid through the valve.

[0037] A sealing ring is provided at the portion where the valve disc body 1 contacts the valve disc shaft 5. Figure 2 ,like Figure 3 As shown, it includes O-ring 2 and O-ring 3, which are sleeved on valve disc shaft 5. O-ring 2 and O-ring 3 are made of soft materials such as rubber and play an isolation role.

[0038] like Figure 4 , Figure 5As shown, the contact surface 6 of the valve disc body 1 and the contact surface 9 of the valve seat are coupled in pairs, and the seal is achieved by close contact. The contact surface is a frustum straight surface or an arc surface. The shape and size of the arc surface are not spherical, and the arc does not reach the large arc of the spherical surface. It only has a certain small arc compared with the straight surface, and the arc is between the arc of the straight surface and the arc of the spherical surface. The radius of curvature of the arc is not necessarily equal, it may be a variable diameter, or it may conform to the relationship of a curve function such as a parabola.

[0039] The frustum straight surface or arc surface of the valve disc body 1 plays the sealing function of the valve disc. The valve disc body 1 is the core of the valve disc. Suitable materials are selected around the functions of high temperature resistance, high strength resistance, fluid erosion resistance, corrosion resistance, cavitation resistance, wear resistance, etc., which reduces the use of high-value materials, has a simple shape, is easy to manufacture, has good quality, is durable, and extends the life of the valve disc.

[0040] like Figure 4 , Figure 5 As shown, a spring is provided on the upper part of the valve disc body 1, one end of the spring is connected to the fastening nut 4, and the other end is connected to the pump body guide sleeve 13. The initial function of the spring 12 on the valve disc body 1 is to improve the transient response parameters of the one-way valve at the moment of opening and closing, improve the one-way valve after it is worn in use, and play a compensatory role in promoting the contact repair between the valve disc and the valve seat, thereby extending the service life.

[0041] like Figure 4 , Figure 5 As shown, the outer surface of the valve seat is a conical surface, and the outer conical surface of the valve seat cooperates with the conical hole of the pump hydraulic end base 14, which can automatically center and align, and position it securely according to the cone angle of the self-locking angle.

[0042] A semicircular groove 15 is provided in the middle of the outer cone of the valve seat for accommodating a positioning clamp ring so that the positioning clamp ring can be installed repeatedly and consistently when the pump base 14 is installed, and can be easily pulled out when the valve seat is replaced.

[0043] The semicircular groove in the middle part of the outer cone of the valve seat is provided with sealing ring grooves above and below for accommodating the sealing ring. The two O-ring sealing grooves provide two external sealing guarantees.

[0044] The inner conical surface 9 of the valve seat is manufactured in an integrated manner with the outer conical surface, and has high strength and good concentricity.

[0045] It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced may be any one or a combination of the above, or any other beneficial effects that may be obtained.

[0046] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only an example and does not constitute a limitation of the present invention.

[0047] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences, the use of alphanumeric characters, or the use of other names described in the present invention are not intended to limit the order of the processes and methods of the present invention. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of the present invention.

[0048] Similarly, it should be noted that in order to simplify the description of the utility model disclosure and thus help understand one or more invention embodiments, in the above description of the utility model embodiments, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the utility model object requires more features than those mentioned in the claims.

[0049] Finally, it should be understood that the embodiments described in the present invention are only used to illustrate the principles of the embodiments of the present invention. Other variations may also fall within the scope of the present invention. Therefore, as an example and not a limitation, alternative configurations of the embodiments of the present invention may be considered consistent with the teachings of the present invention. Accordingly, the embodiments of the present invention are not limited to the embodiments explicitly introduced and described in the present invention.

Claims

1. A valve disc of a mud pump, characterized in that: The invention comprises a valve disc body (1), a valve disc shaft (5), and a fastening nut (4); a hole structure matching the valve disc shaft (5) is provided at the center of the valve disc body (1), the valve disc shaft (5) passes through the hole structure of the valve disc body (1), and a fastening nut (4) is installed on the valve disc shaft (5) at the upper part of the valve disc body (1); the part where the valve disc shaft (5) is connected to the valve disc body (1) has a boss structure with a diameter larger than the valve disc shaft (5), and the boss structure is embedded in the lower part of the valve disc body (1); the boss structure and the lower guide part of the valve disc shaft (5) have an arc surface transition; a sealing ring is provided at the part where the valve disc body (1) contacts the valve disc shaft (5); the valve disc body contact surface (6) and the valve seat contact surface (9) are coupled in pairs, and close contact is achieved to achieve sealing, and the contact surface is a frustum straight surface or an arc surface; a spring is provided at the upper part of the valve disc body (1), one end of the spring is connected to the fastening nut (4), and the other end is connected to the pump body guide sleeve (13).

Images