A dynamic self-adjusting self-compensating piston assembly and hydraulic slurry pump

Abstract

The present invention discloses a dynamic self-adjusting and self-compensating piston assembly and a hydraulic slurry pump. The piston assembly includes a fixed seat and a floating seat. An annular space is arranged on the outer cylindrical surface of the fixed seat. The floating seat is installed in a floating manner in the annular space, and the floating seat is sealed and connected to the fixed seat. The present invention can ensure the assembly error after the processing tolerance of parts is transmitted and accumulated through multiple components, as well as the concentricity and coaxiality error after the elastic deformation of the equipment under the working load is superimposed on each other. Dynamic automatic adjustment is achieved during the sliding process of the floating seat, and the eccentric wear of the sealing ring between the piston assembly and the conveying cylinder is avoided; the sealing ring arranged on the floating seat realizes self-sealing under the slurry pressure and automatically compensates for the wear of the sealing ring; even when cooling water is not used for cooling, the service life of the slurry sealing ring can be effectively guaranteed, while reducing the production and manufacturing costs, the user's operation and maintenance costs are greatly reduced.

Description

Technical Field

[0001] The invention relates to a hydraulic slurry pump, in particular to a dynamic self-adjusting self-compensating piston assembly and a hydraulic slurry pump. Background Art

[0002] At present, the transportation of solid-liquid mixed slurries such as mud and ore slurry is often achieved by hydraulic slurry pumps. The hydraulic slurry pump drives the piston in the delivery cylinder to make reciprocating linear motion through hydraulic pressure, so that the pressure or volume in the delivery cylinder changes, and the delivery cylinder automatically pumps the slurry.

[0003] When the hydraulic slurry pump automatically pumps slurry, the piston reciprocates in the delivery cylinder. The piston and the delivery cylinder are required to be installed strictly coaxially at all times to avoid local excessive wear of the seal ring between the piston and the delivery cylinder, which may reduce the life of the hydraulic slurry pump. However, hydraulic slurry pumps work under variable working conditions. The pressure and flow rate of the slurry they deliver are highly correlated with the characteristics of the external working conditions. During each round of slurry delivery, the pressure and flow rate of the slurry discharged in each round of reciprocating motion of the piston are always in a dynamic change process. At the same time, the multi-dimensional elastic deformation of the various components of the equipment is coupled with each other, which can easily cause the piston and the delivery cylinder to be in a dynamically changing eccentric state, making it easy for the seal ring position between the piston and the delivery cylinder to generate a higher temperature. The friction surface where the delivery cylinder and the seal ring contact even generates local high temperature. Therefore, it often leads to excessive wear of the seal ring, a sharp shortening of the life, frequent equipment maintenance, unreliable operation and other problems.

[0004] In order to solve this problem, the general method is to use cooling water to lubricate and cool the sealing ring. That is, while reciprocating pumping, the cooling water flows for a long time to flush the slurry, impurities and other solid particles attached to the sealing ring position, clean the contact surface between the conveying cylinder and the sealing ring, improve the ambient temperature of the sealing ring, and indirectly extend the life of the sealing ring and the slurry pump.

[0005] However, the addition of cooling water did not fundamentally solve the problem, but only alleviated the symptoms of the problem and slightly increased the seal life. Especially for large-flow reciprocating pumps, the piston of the delivery cylinder moves at high speed, friction generates intense heat, and the equipment elastically deforms under the operating load. The assembly error accumulated after the machining tolerances of the components are transferred through multiple components makes it very easy for the concentricity and coaxiality of the piston and the seal to get out of control, resulting in common eccentric friction. Individual parts of the seal between the delivery cylinder and the piston wear faster, and the service life is severely shortened, resulting in frequent equipment shutdowns for maintenance. Summary of the invention

[0006] The technical problem to be solved by the present invention is that, in view of the problem that the sealing ring of the hydraulic slurry pump is easily locally worn due to the eccentricity between the piston and the conveying cylinder, the present invention provides a dynamic self-adjusting and self-compensating floating piston assembly and a hydraulic slurry pump which can avoid uneven wear of the sealing ring between the piston and the conveying cylinder and increase the service life of the hydraulic slurry pump.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A dynamic self-adjusting self-compensating piston assembly comprises a fixed seat and a floating seat. An annular space is arranged on the outer circumference of the fixed seat. The floating seat is installed in a floating manner in the annular space. The floating seat and the fixed seat are detachably sealed.

[0009] The piston assembly of the present invention includes a fixed seat and a floating seat, and the floating seat is installed in a floating manner on the outer circumferential surface of the fixed seat. With the help of the deflection and radial movement of the floating seat in the annular space, the concentricity of the piston assembly and the delivery cylinder can be dynamically and automatically adjusted, so that the piston assembly and the delivery cylinder are always installed coaxially, avoiding local wear of the seal between the piston assembly and the delivery cylinder, improving the sealing reliability of the hydraulic slurry pump, and extending its service life. In addition, the present invention uses the seal between the floating seat and the inner wall of the delivery cylinder and the fixed seat as an elastic support body, which not only realizes the sealing between the floating seat and the fixed seat and the inner wall of the delivery cylinder, but also realizes dynamic self-adjustment and self-compensation because the floating seat and the seal are installed in the fixed seat through clearance fit and floating, thereby simplifying the structure of the hydraulic slurry pump.

[0010] Preferably, an annular boss is provided at one end of the outer cylindrical surface of the fixed seat, and a pressure plate is detachably installed at the other end, an annular space is formed between the annular boss and the pressure plate, the floating seat and the sealing member are floatingly installed in the annular space, and the floating seat is sealed and connected to the annular boss and the pressure plate respectively.

[0011] Preferably, pressure plates are detachably mounted at both ends of the outer cylindrical surface of the fixed seat, an annular space is formed between the two pressure plates, the floating seat and the sealing member are floatingly mounted in the annular space, and the floating seat is sealed and connected to the two pressure plates respectively.

[0012] Preferably, an annular first sealing groove is arranged on the outer circumferential surface of the floating seat, and one or more pressure-self-sealing first sealing rings made of a polymer elastic material are arranged in the first sealing groove.

[0013] Preferably, both ends of the floating seat are respectively provided with a second sealing groove, and a second sealing ring is installed in the second sealing groove.

[0014] Preferably, a third sealing ring or a sealing gasket made of a polymer elastic material is installed between the pressing plate and the fixing seat.

[0015] Preferably, a second sealing ring is installed between the pressure plate and the floating seat.

[0016] Preferably, the first sealing ring is a polymer elastic sealing ring with a pressure self-sealing lip.

[0017] Based on the same inventive concept, the present invention also provides a hydraulic slurry pump with dynamic self-compensation for concentricity, comprising one or more delivery cylinders and a piston assembly installed in the delivery cylinder, and a floating seat of the piston assembly is sealingly connected to the inner wall of the delivery cylinder.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention can ensure the assembly error after the processing tolerance of parts is transmitted and accumulated through multiple parts, as well as the concentricity and coaxiality error of the equipment after the elastic deformation under the working load is superimposed on each other. In the process of the floating seat sliding along the inner wall of the conveying cylinder, dynamic adjustment and compensation are achieved through the swing and radial movement of the floating seat, thereby avoiding eccentric wear of the slurry sealing ring between the piston assembly and the conveying cylinder, ensuring that the sealing pressure ratio of the slurry sealing ring between the piston assembly and the conveying cylinder is uniform and the circumference is uniformly worn; even without cooling water cooling, the service life of the slurry sealing ring can be effectively guaranteed, the equipment does not need frequent shutdown for maintenance, while reducing the production and manufacturing costs, the user's operation and maintenance costs are greatly reduced, and the reliability of the hydraulic slurry pump is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a structural cross-sectional view of a first embodiment of a hydraulic slurry pump according to the present invention.

[0022] Figure 2 It is a cross-sectional view of the combined structure of the floating seat and the sealing ring installed thereon in the first embodiment of the hydraulic slurry pump of the present invention.

[0023] Figure 3 This is a structural cross-sectional view of a second embodiment of the hydraulic slurry pump of the present invention.

[0024] Figure 4 It is a schematic diagram of the structure of the floating seat and the mud scraper ring installed thereon in the second embodiment.

[0025] Figure 5 This is a structural cross-sectional view of a third embodiment of the hydraulic slurry pump of the present invention.

[0026] Figure 6 It is a cross-sectional view of a floating seat and a sealing ring assembly structure installed thereon according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0028] For the convenience of description, the relative position relationship of each component, such as up, down, left, right, etc., is described according to the layout direction of the drawings in the specification, and does not limit the structure of this patent.

[0029] like Figure 1 - Figure 2 As shown, the first embodiment of the hydraulic slurry pump of the present invention comprises a delivery cylinder 1 and a piston assembly installed in the delivery cylinder. The piston assembly is detachably installed on the head of the piston rod 8. The delivery cylinder 1, the piston rod 8, and the fixing seat 2 are all rigid structures relative to the polymer elastic sealing ring.

[0030] The piston assembly includes a fixed seat 2, an annular floating seat 4 and a pressure plate 3. The fixed seat 2 is detachably connected to the head of the piston rod 8 via fasteners, and an annular step 21 is provided on the outer circumferential surface of the fixed seat 2, so that the fixed seat 2 has a small end face and a large end face, and the pressure plate 3 is installed on the small end face via screws 5, and an annular space 7 is formed between the pressure plate 3, the annular step 21 and the inner wall of the conveying cylinder. The floating seat 4 is floatingly installed in the annular space 7 through clearance fit, and the floating seat 4 is sealedly connected to the inner wall of the conveying cylinder 1, the fixed seat 2, and the pressure plate 3. In addition, the present invention is not limited to the annular space 7 formed by detachably installing the pressure plate 3 at one end of the fixed seat 2, and the annular space 7 can also be formed by detachably installing the pressure plates 3 protruding outward on the two end faces of the fixed seat 2.

[0031] In this embodiment, a support ring 9 made of wear-resistant material is installed in the middle of the outer circumference of the floating seat 4, and first sealing grooves 10 are respectively arranged on the outer circumferences of the two ends of the support ring 9 of the floating seat 4. A first sealing ring 11 is installed in the first sealing groove 10, and the floating seat 4 is in sliding contact with the inner wall of the conveying cylinder 1 through the support ring 9 and the first sealing ring 11. The first sealing ring 11 adopts a polymer elastic sealing ring with a pressure self-sealing lip, preferably a sealing ring with a Y-shaped or U-shaped cross section. Obviously, the support ring 9 is not a necessary component in the present invention, and the corresponding function can be achieved without installing the support ring 9 on the outer circumference of the floating seat 4.

[0032] In this embodiment, second sealing grooves 12 are respectively provided on the two end faces of the floating seat 4, and a second sealing ring 13 is installed in the second sealing groove 12 to achieve sealing between the end face of the floating seat 4 and the fixed seat 2 and the pressure plate 3; a third sealing groove 15 is provided on the pressure plate 3, and a third sealing ring 6 is installed in the third sealing groove 15 to achieve sealing of the third sealing groove between the pressure plate 3 and the end face of the fixed seat 2.

[0033] In the present invention, since the floating seat 4 is installed in a floating manner in the annular space 7, during the reciprocating motion of the piston assembly, the floating seat 4 can swing and move radially in the annular space 7, so that the concentricity between the piston assembly and the conveying cylinder 1 is automatically adjusted, thereby avoiding local excessive wear of the first sealing ring 11.

[0034] like Figure 3 - Figure 4 As shown, the structure of the second embodiment of the hydraulic slurry pump of the present invention is roughly the same as that of the first embodiment, and the only difference is that mud scraper rings 14 are respectively installed on the outer sides of the two first sealing rings 11 at both ends of the outer circumferential surface of the floating seat 4 to minimize the adhesion of mud and sand to the first sealing rings 11 and improve the sealing performance of the first sealing rings 11.

[0035] like Figure 5 - Figure 6 As shown, the structure of the third embodiment of the hydraulic slurry pump of the present invention is roughly the same as that of the first embodiment, and the only difference is that the second sealing groove 12 is arranged on the fixed seat 2 and the pressure plate 3, and the floating seat 4 is floatingly installed in the annular space 7 through the first sealing ring 11, the support ring 9, and the second sealing ring 13.

[0036] The above is only a specific implementation scheme of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can make many possible changes and modifications to the technical scheme of the present invention by using the technical content disclosed above without departing from the scope of the technical scheme of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical scheme of the present invention should fall within the protection scope of the technical scheme of the present invention.

Claims

1. A hydraulic slurry pump, comprising a delivery cylinder and a piston assembly installed in the delivery cylinder, characterized in that: The piston assembly includes a fixed seat and an annular floating seat, an annular space is arranged on the outer cylindrical surface of the fixed seat, the annular floating seat is floatingly installed in the annular space through clearance fit, and the annular floating seat and the fixed seat are planarly sealed and connected; a support ring made of wear-resistant material is installed in the middle of the outer cylindrical surface of the annular floating seat, and an annular first sealing groove is respectively arranged at both ends, and one or more pressure-self-sealing first sealing rings made of polymer elastic material are arranged in the first sealing groove, and the annular floating seat is in sliding contact with the inner wall of the conveying cylinder through the support ring and the first sealing ring; second sealing grooves are respectively arranged at both ends of the annular floating seat, and a second sealing ring is installed in the second sealing groove, so that the end face of the annular floating seat is planarly sealed and connected with the two end faces of the annular space; the piston assembly is sealed and connected to the inner wall of the conveying cylinder through the annular floating seat.

2. The hydraulic slurry pump according to claim 1, characterized in that: An annular boss is arranged at one end of the outer cylindrical surface of the fixed seat, and a pressure plate is detachably installed at the other end, an annular space is formed between the annular boss and the pressure plate, the annular floating seat is floatingly installed in the annular space, and the annular floating seat is planarly sealedly connected to the annular boss and the pressure plate respectively.

3. The hydraulic slurry pump according to claim 1, characterized in that: The two ends of the outer cylindrical surface of the fixed seat are respectively detachably mounted with pressure plates, an annular space is formed between the two pressure plates, the annular floating seat is floatingly mounted in the annular space, and the annular floating seat is respectively planarly sealed and connected with the two pressure plates.

4. The hydraulic slurry pump according to claim 2 or 3, characterized in that: A third sealing ring is installed between the pressing plate and the fixing seat.

5. The hydraulic slurry pump according to claim 4, characterized in that: The third sealing ring is a sealing gasket made of a polymer elastic material.

6. The hydraulic slurry pump according to claim 4, characterized in that: The first sealing ring is a polymer elastic sealing ring with a pressure self-sealing lip.

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