A flow controllable double-sphere powder slag special ball valve group

Abstract

The present invention discloses a flow-controllable double-sphere ball valve group for powder and slag, which mainly includes a valve body, a valve group switch ball and a flow control ball. By simultaneously arranging a valve group switch ball and a flow control ball arranged in sequence along the flow direction of the medium in the valve body, and controlling the opening and closing of the valve group as a whole with the valve group switch ball, flow control is achieved with the flow control ball in a non-completely closed state. The opening of the flow control ball determines the size of the medium flow, and the purpose of regulating the flow can be achieved by adjusting the opening of the flow control ball. During normal use, the flow control ball maintains a certain opening, and its opening can be adjusted in a non-use state to meet other flow requirements. The ball valve group of the present invention has a novel and reasonable structure, and a hard seal is formed between the flow control ball and the corresponding valve seat, which can effectively alleviate the erosion of the ball sealing structure by impurities under harsh working conditions, thereby improving the overall service life of the ball valve group for powder and slag, and has strong practicality.

Description

Technical Field

[0001] The invention belongs to the technical field of valves and relates to a special ball valve for powder and slag, in particular to a flow-controllable double-sphere special ball valve group for powder and slag. Background Art

[0002] With the development of valve technology, the functional requirements for powder-slag special ball valves used in media conditions containing particles and impurities, such as liquid or gas media containing 0.1mm-6mm particles, are becoming higher and higher. Not only are the valves required to meet zero leakage standards, but the flow rate needs to be adjusted under actual working conditions. In some cases, the full diameter of the pipeline is also required. The existing ball valve structure mostly adjusts the flow rate by adjusting the opening of the ball. However, due to the sealing performance of the existing powder-slag special ball valve, which is composed of a hard sealing system and a soft sealing system, in harsh media conditions containing particles and impurities, if the valve is not fully open or fully closed, the particles in the medium will flush the soft seal of the valve (mostly made of flexible materials, such as PTFE), causing the sealing performance to completely fail, thereby reducing the service life of the valve.

[0003] Therefore, it is necessary to propose a new valve structure to overcome the problems existing in the above-mentioned prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a flow-controllable double-sphere powder-slag special ball valve group with a novel and reasonable structure, so as to solve the problem that the service life of the above-mentioned existing ball valves will be greatly reduced when used for flow control.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a flow-controllable double-sphere powder-slag special ball valve group, which mainly comprises:

[0007] Valve body;

[0008] A valve group switch ball, the valve group switch ball is arranged inside the valve body and located at one end of the valve body; the top of the valve group switch ball is connected to a first transmission shaft, the first transmission shaft is connected to a first actuator, and the valve group switch ball can rotate under the drive of the first actuator to control the opening and closing of the valve group; a valve seat corresponding to the valve group switch ball is arranged in the valve body;

[0009] A flow control ball, which is arranged inside the valve body and located at the other end of the valve body; the flow control ball always maintains an incompletely closed state to control the flow of the medium; a hard seal is formed between the flow control ball and the corresponding valve seat; a valve seat corresponding to the flow control ball is arranged in the valve body;

[0010] The valve group switch ball and the flow control ball are arranged in sequence along the medium flow direction.

[0011] Optionally, a hard seal is formed between the flow control ball and the corresponding valve seat, which may be a pure metal sealing system, such as composed of two metal sealing rings.

[0012] Optionally, the top end of the flow control ball is connected to a second transmission shaft, and the second transmission shaft is connected to a second actuator. The flow control ball can rotate under the drive of the second actuator to adjust the opening of the flow control ball.

[0013] Optionally, the valve group switch ball is a fixed spherical structure; when the valve group switch ball is a fixed spherical structure, a positioning support shaft is also connected to the bottom of the valve group switch ball.

[0014] Optionally, the flow control sphere is a fixed sphere structure; when the flow control sphere is a fixed sphere structure, a positioning support shaft is also connected to the bottom of the flow control sphere.

[0015] Optionally, a valve seat retaining ring is provided between the valve group switch ball and the corresponding valve seat, and a combined sealing member is provided between the valve group switch ball and the valve seat retaining ring.

[0016] Optionally, a valve seat retaining ring is provided between the flow control ball and the corresponding valve seat.

[0017] Optionally, the combined sealing element includes a polytetrafluoroethylene sealing ring and a ring support, and the polytetrafluoroethylene sealing ring abuts against the outer edge of the switch ball of the valve assembly through the ring support.

[0018] Optionally, the first actuator and / or the second actuator is a manual actuator or an electric actuator.

[0019] Optionally, a concave ring is provided on the outer wall of the first transmission shaft and / or the second transmission shaft close to the sphere, and a sealing ring is provided between the concave ring and the valve body.

[0020] Optionally, at least one flow control sphere is provided, and at least one flow control sphere is provided continuously; the opening of each flow control sphere decreases successively along the flow direction of the medium.

[0021] Optionally, the valve group switch ball can be provided at two ends, respectively located at two ends of the valve body.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The flow-controllable double-sphere ball valve group for powder and slag proposed by the present invention simultaneously arranges a valve group switch ball and a flow control ball in the valve body, and controls the opening and closing of the valve group as a whole with the valve group switch ball, and realizes flow control with the flow control ball in a non-completely closed state. The opening of the flow control ball determines the size of the medium flow, and the purpose of regulating the flow can be achieved by adjusting the opening of the flow control ball. During normal use, the flow control ball maintains a certain opening, and its opening can be adjusted when not in use to meet other flow requirements. The flow-controllable double-sphere ball valve group for powder and slag of the present invention has a novel and reasonable structure, and a hard seal is formed between the flow control ball and the corresponding valve seat, which can effectively alleviate the erosion of the ball sealing structure by impurities under harsh working conditions, thereby increasing the service life of the valve group and having strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 will be briefly introduced below. Obviously, the drawings described below are only 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.

[0025] Figure 1 It is a structural schematic diagram of a flow-controllable double-sphere powder-slag special ball valve group disclosed in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0027] Among them, the accompanying drawings are marked as: 100, flow-controllable double-sphere powder-slag special ball valve group; 1, valve body; 2, valve seat; 3, valve group switch ball; 4, first transmission shaft; 5, flow control ball; 6, second transmission shaft; 7, positioning support shaft; 8, concave ring; 9, flange. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] One of the purposes of the present invention is to provide a novel and reasonable structured flow-controllable double-sphere powder-slag special ball valve group to solve the problem that the service life of the above-mentioned existing valves is greatly reduced when used for flow control.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Embodiment 1

[0032] like Figure 1 As shown, this embodiment provides a flow controllable double-ball powder-slag special ball valve group 100, which mainly includes a valve body 1, a valve group switch ball 3 and a flow control ball 5. Among them, the valve group switch ball 3 is arranged inside the valve body 1 and is located at one end of the valve body 1; the top of the valve group switch ball 3 is connected to a first transmission shaft 4, and the first transmission shaft 4 is connected to a first actuator (not shown in the figure), and the valve group switch ball 3 can rotate under the drive of the first actuator to control the opening and closing of the valve group; a valve seat 2 matching the valve group switch ball 3 is welded in the valve body 1. The flow control ball 5 is arranged inside the valve body 1 and is located at the other end of the valve body 1. When the flow control ball 5 and the valve group switch ball 3 are both in a fully open state, the through-hole axes of the two coincide; the flow control ball 5 always maintains an incompletely closed state, and maintains the same opening during use to control the flow of the medium; a valve seat 2 matching the flow control ball 5 is welded in the valve body 1, and a hard seal is formed between the flow control ball 5 and the valve seat 2. When in use, the valve group switch ball 3 and the flow control ball 5 are distributed in sequence along the flow direction of the medium.

[0033] In this embodiment, Figure 1 As shown, the top of the flow control ball 5 is connected to the second transmission shaft 6, and the second transmission shaft 6 is connected to the second actuator (not shown in the figure). The flow control ball 5 can rotate under the drive of the second actuator to adjust the opening of the flow control ball 5. During normal use, the flow control ball 5 maintains a certain fixed opening, and its opening can be adjusted by the second actuator in a non-use state to meet other flow requirements, so as to achieve the purpose of adjustable flow of the valve group.

[0034] In this embodiment, the valve group switch ball 3 and the flow control ball 5 are preferably connected to their respective transmission shafts by a key.

[0035] In this embodiment, the valve group switch ball 3 can adopt a fixed ball structure or a floating ball structure; Figure 1 As shown, when the valve group switch ball 3 is a fixed ball structure, the bottom of the valve group switch ball 3 is also connected to a positioning support shaft 7.

[0036] In this embodiment, the flow control ball 5 can adopt a fixed ball structure or a floating ball structure; Figure 1 As shown, when the flow control sphere 5 is a fixed sphere structure, a positioning support shaft 7 is also connected to the bottom of the flow control sphere 5 .

[0037] In this embodiment, the positioning support shaft 7 of the valve group switch ball 3 and the positioning support shaft 7 of the flow control ball 5 are both equipped with a positioning shaft bracket, which is fixed to the bottom of the valve body 1. The positioning support shaft 7 and the flow control ball 5 are connected to the corresponding positioning support shaft 7 by key connection. A positioning shaft bushing is provided between each positioning support shaft 7 and the inner wall of the corresponding positioning shaft bracket.

[0038] In this embodiment, Figure 1 As shown, a valve seat retaining ring is arranged between the valve group switch ball 3 and the corresponding valve seat 2, and a combined seal is arranged between the valve group switch ball 3 and the valve seat retaining ring. The combined seal includes a polyfluorocarbon sealing ring and a ring support, and the polyfluorocarbon sealing ring abuts against the outer edge of the valve group switch ball 3 through the ring support.

[0039] In this embodiment, Figure 1 As shown, a valve seat retaining ring is arranged between the flow control ball 5 and the corresponding valve seat 2 .

[0040] In this embodiment, Figure 1 As shown, the first actuator and / or the second actuator is a manual actuator or an electric actuator. The manual actuator can be a hand plate, a manual turbine, etc., and the electric actuator can be an electric motor, a motor reducer, or an electric turbine, etc.

[0041] In this embodiment, Figure 1 and 2 As shown, a concave ring 8 is provided on the outer wall of the first transmission shaft 4 and / or the second transmission shaft 6 close to the sphere, and a sealing ring is provided between the concave ring 8 and the valve body to prevent harsh media or impurities in the media from affecting the normal use of the transmission shaft or actuator.

[0042] In this embodiment, the first transmission shaft 4 and the second transmission shaft 6 are respectively provided with transmission shaft brackets, which are fixed to the top of the valve body 1 and are mainly used to support the actuator or install other structures. A transmission shaft bushing is provided between the first transmission shaft 4 and the second transmission shaft 6 and their respective transmission shaft brackets. The arrangement of the transmission shaft bracket and the transmission shaft bushing adopts a conventional installation method in the prior art, such as arranging a packing and a packing gland between the transmission shaft bracket and the transmission shaft, which will not be repeated here.

[0043] In this embodiment, as a preferred mode, at least one flow control sphere 5 is provided, and at least one flow control sphere 5 is provided continuously; when more than two flow control spheres 5 are provided, the opening of each flow control sphere 5 can be reduced successively along the flow direction of the medium.

[0044] In this embodiment, valve group switch balls 3 can be provided at both ends of the valve body 1.

[0045] The flow-controllable double-sphere powder-slag special ball valve group proposed in this embodiment, by simultaneously arranging the valve group switch ball and the flow control ball in the valve body, and controlling the opening and closing of the valve group as a whole with the valve group switch ball, and realizing flow control with the flow control ball in a non-completely closed state, the opening of the flow control ball determines the size of the medium flow, and the purpose of regulating the flow can be achieved by adjusting the opening of the flow control ball. During normal use, the flow control ball maintains a certain opening, and its opening can be adjusted in a non-use state to meet other flow requirements. The flow-controllable double-sphere powder-slag special ball valve group of this embodiment has a novel and reasonable structure, and a hard seal is formed between the flow control ball and the corresponding valve seat, which can effectively alleviate the erosion of the ball sealing structure by impurities under harsh working conditions, thereby increasing the service life of the valve group. The valve group switch ball can meet the full-diameter requirements under individual working conditions, and is highly practical.

[0046] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A flow controllable double-sphere powder slag special ball valve group, characterized by: include: Valve body; A valve group switch ball, the valve group switch ball is arranged inside the valve body and located at one end of the valve body; a first transmission shaft is connected to the top of the valve group switch ball, the first transmission shaft is connected to the first actuator, and the valve group switch ball can rotate under the drive of the first actuator to control the opening and closing of the valve group; a valve seat corresponding to the valve group switch ball is arranged in the valve body; a valve seat retaining ring is arranged between the valve group switch ball and the corresponding valve seat, and a combined seal is arranged between the valve group switch ball and the valve seat retaining ring, the combined seal includes a polytetrafluoroethylene sealing ring and a ring support, and the polytetrafluoroethylene sealing ring abuts against the outer edge of the valve group switch ball through the ring support; A flow control ball, which is arranged inside the valve body and located at the other end of the valve body; the flow control ball always remains in an incompletely closed state to control the flow of the medium; a valve seat corresponding to the flow control ball is arranged in the valve body; a valve seat retaining ring is arranged between the flow control ball and the valve seat corresponding thereto, and a hard seal is formed between the flow control ball and the valve seat corresponding thereto; more than two flow control balls are arranged, and the flow control balls are arranged continuously, and the opening of each flow control ball decreases in sequence along the flow direction of the medium; The valve group switch ball and the flow control ball are arranged in sequence along the medium flow direction.

2. The flow controllable double-sphere powder-slag special ball valve group according to claim 1 is characterized by: The top end of the flow control ball is connected to a second transmission shaft, and the second transmission shaft is connected to a second actuator. The flow control ball can rotate under the drive of the second actuator to adjust the opening of the flow control ball.

3. The flow controllable double-sphere powder-slag special ball valve group according to claim 1 or 2, characterized in that: The valve group switch ball is a fixed ball structure, and the bottom of the valve group switch ball is also connected to a positioning support shaft.

4. The flow controllable double-sphere powder-slag special ball valve group according to claim 1 or 2, characterized in that: The flow control sphere is a fixed sphere structure, and the bottom of the flow control sphere is also connected to a positioning support shaft.

5. The flow controllable double-sphere powder-slag special ball valve group according to claim 2 is characterized by: The first actuator and / or the second actuator is a manual actuator or an electric actuator.

6. The flow controllable double-sphere powder-slag special ball valve group according to claim 2 is characterized by: A concave ring is arranged on the outer wall of the first transmission shaft and / or the second transmission shaft close to the sphere, and a sealing ring is arranged between the concave ring and the valve body.

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