A double-disc gate valve with frictionless opening and closing process

Abstract

A double-disc gate valve with frictionless switching process, characterized in that: the gate assembly includes two parallel gates, a pressure relief hole is formed on the gate, two symmetrically arranged top cores are arranged between the two gates, the top cores are slidably matched with the gates and correspond to the pressure relief holes; an external thread is formed on the outer ring of the top core, and two locking rings are also arranged between the two gates, the two locking rings are respectively matched with the two top core threads, and the two locking rings are respectively connected to the valve stem through two connecting rods, the valve stem can drive the locking ring to rotate and drive the top core to slide along the gate straight line, and the two top cores have a first position of opening the sealed pressure relief hole to both sides and driving the gate and the valve body to maintain sealing, and a second position of closing to the middle to make the pressure relief hole conductive. Its advantage is that when the valve is opened, it can realize pressure relief before opening the valve, avoid or reduce the friction of the gate sealing surface, and make the valve opening operation easier.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a double-plate gate valve with no friction during the switching process. Background Art

[0002] The gate valve's opening and closing parts are gates, and the gate's movement direction is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. Among them, the parallel double-disc gate valve has better sealing, but when opening, the parallel double-disc gate valve needs to overcome the friction between the gate and the valve seat caused by the thrust of the medium. When the pressure difference is large, it not only requires a large opening force, which makes the operation difficult, but also easily causes friction damage to the valve seat or gate. Summary of the invention

[0003] In order to overcome the shortcomings of the background technology, the present invention provides a double-plate gate valve with no friction during the switching process.

[0004] The technical solution adopted by the present invention is as follows: a double-plate gate valve with frictionless switching process, comprising a valve body, a valve cover, a valve stem, and a gate assembly, wherein the valve cover is arranged above the valve body, and the valve stem passes through the valve cover and is connected to the gate assembly; the gate assembly comprises two parallel gates, a pressure relief hole is formed on the gate plate, and two symmetrically arranged top cores are arranged between the two gate plates, the top cores are slidably matched with the gate plates and correspond to the pressure relief holes; an external thread is formed on the outer ring of the top core, and two locking rings are further arranged between the two gate plates, the two locking rings are respectively matched with the two top core threads, and the two locking rings are respectively connected to the valve stem through two connecting rods, the valve stem can drive the locking ring to rotate and drive the top core to slide linearly along the gate plate, and the two top cores have a first position that opens the sealed pressure relief hole to both sides and drives the gate plate and the valve body to maintain sealing, and a second position that retracts to the middle to make the pressure relief hole conductive.

[0005] An annular mounting boss is formed on the inner side surface of the gate plate, one end of the top core is inserted into the annular mounting boss, and a first sealing ring is provided between the top core and the inner wall of the annular mounting boss; the locking ring is sleeved on the annular mounting boss, and a second sealing ring is provided between the locking ring and the annular mounting boss; the two locking rings fit tightly, and a third sealing ring is provided between the two locking rings; a pressure relief channel is formed in the top core, the pressure relief channels of the two top cores are connected by a connecting pipe, and a sealed sliding fit is formed between the connecting pipe and the pressure relief channel.

[0006] An annular groove is formed on the end face of one of the lock rings, and an annular boss is correspondingly formed on the other lock ring, and the two lock rings are plugged into each other through the annular groove and the annular boss.

[0007] A conical sealing surface is formed at the end of the top core, and a conical seal is formed between the top core and the pressure relief hole.

[0008] When the valve is closed, the valve stem is pushed downward, and the valve stem drives the two locking rings to rotate through two connecting rods. The two locking rings cooperate with the threads between the top cores to drive the two top cores to open to both sides. The top core contacts the gate and provides a large driving force. Under the action of this driving force, the top core and the gate produce a sealed and closed pressure relief hole, and the gate and the valve body remain sealed.

[0009] When the valve is opened, the valve stem is lifted upward, and the valve stem drives the two locking rings to rotate respectively through two connecting rods. The two locking rings cooperate with the threads between the top cores to drive the two top cores to move toward the middle to open the pressure relief hole, and the valve is depressurized. Then the valve stem continues to be lifted upward, so that the gate is out of the flow channel position and the valve is fully opened.

[0010] The beneficial effect of the present invention is that: by adopting the above scheme, when the valve is opened, the pressure can be released first and then the valve can be opened, thereby avoiding or reducing the friction of the gate sealing surface, and the valve opening operation is easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a double-plate gate valve with frictionless switching process according to an embodiment of the present invention.

[0012] Figure 2 It is a schematic structural diagram of a gate assembly according to an embodiment of the present invention.

[0013] Figure 3-4 The figure is a schematic diagram of the operating principle of the valve stem, connecting rod and locking rod according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0015] As shown in the figure, a double-plate gate valve with no friction in the switching process includes a valve body 1, a valve cover 2, a valve stem 3, and a gate assembly.

[0016] The valve body 1 includes a central cavity and flow channels on both sides of the central cavity for medium circulation. The valve cover 2 is arranged above the valve body 1. The upper end of the valve stem 3 is connected to the actuator, and the lower end passes through the valve cover 2 to be connected to the gate assembly. The valve stem 3 can drive the gate assembly to rise and fall, thereby realizing the opening and closing action of the valve.

[0017] The gate assembly includes two gates 4 arranged in parallel. A pressure relief hole 41 is formed at the center of the gate 4 . An annular mounting boss 42 is formed on the inner side surface of the gate 4 . The pressure relief hole 41 is located at the center of the annular mounting boss 42 .

[0018] Two symmetrically arranged top cores 5 are provided between the two gate plates 4. One end of the top core 5 is inserted into the annular mounting boss 42 of the gate plate 4 to form a sliding fit with the gate plate 4. The outer ring of the other end of the top core 5 is formed with an external thread 51. A conical sealing surface 53 adapted to the pressure relief hole 41 is formed at the end of the top core 5, which can form a reliable conical seal with the pressure relief hole 41. A pressure relief channel 52 is also formed in the top core 5.

[0019] Two lock rings 6 are also provided between the two gate plates 4. The two lock rings 6 are respectively threadedly matched with the two top cores 5, and the two lock rings 6 are respectively linked to the valve stem 3 through two connecting rods 7. Among them, the lock ring 6 has a connecting arm extending radially, and the connecting arms of the two lock rings are respectively inclined to both sides. One end of the connecting rod 7 is hinged to the connecting arm, and the other end is hinged to the valve stem. Therefore, the lifting action of the valve stem can drive the two lock rings to perform opposite synchronous rotation actions, and the two lock rings respectively drive the two top cores to perform opposite synchronous linear movements. The two top cores 5 have a first position of opening the sealing pressure relief hole 41 to both sides and driving the gate plate 4 and the valve body 1 to maintain sealing, and a second position of closing to the middle to make the pressure relief hole 41 conductive.

[0020] When the valve is closed, the valve stem is pushed downward, and the valve stem drives the two locking rings to rotate respectively through two connecting rods. The two locking rings cooperate with the threads between the top cores to drive the two top cores to open to both sides. The top core contacts the gate and provides a large driving force. Under the action of this driving force, the conical sealing surface of the top core and the gate seal and close the pressure relief hole, and the gate and the valve body remain sealed.

[0021] When the valve is opened, the valve stem is lifted upward, and the valve stem drives the two locking rings to rotate respectively through two connecting rods. The two locking rings cooperate with the threads between the top cores to drive the two top cores to move toward the middle. The conical sealing surface separates from the pressure relief hole to open the pressure relief hole, and the valve is depressurized. Then the valve stem continues to be lifted upward, so that the gate is out of the flow channel position and the valve is fully opened.

[0022] By adopting the above scheme, when the valve is opened, the pressure can be released first and then the valve can be opened, thus avoiding or reducing the friction of the gate sealing surface, making the valve opening operation easier.

[0023] In addition, a first sealing ring 81 is provided between the top core 5 and the inner wall of the annular mounting boss 42, two locking rings 6 are respectively sleeved on the annular mounting bosses 42 of the two gate plates, and a second sealing ring 82 is provided between the locking ring 6 and the annular mounting boss 42, the two locking rings 6 are tightly fitted, and a third sealing ring 83 is provided between the two locking rings 6. At the same time, the pressure relief channels 52 of the two top cores 5 are connected through the connecting pipe 9, and the connecting pipe 9 and the pressure relief channel 52 form a sealing sliding fit. The first sealing ring 81, the second sealing ring 82, the third sealing ring 83 and the connecting pipe 9 can form a comprehensive seal for the external threaded part of the top core, effectively preventing the problem of transmission failure caused by the entry of particulate matter in the medium, and ensuring a more stable and reliable action.

[0024] Of course, in order to ensure the stable movement of the top core, an additional limiting track can be provided between the top core and the gate plate to prevent the top core from rotating circumferentially with the locking ring, thereby ensuring the reliable linear sliding movement of the top core.

[0025] In addition, an annular groove 61 is formed on the end face of one of the locking rings, and an annular boss 62 is correspondingly formed on the other locking ring. The two locking rings are plugged into each other through the annular groove 61 and the annular boss 62, and the overall structure is more stable. When the valve is opened, the two locking rings are balanced in force and the operation is reliable.

[0026] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A double-plate gate valve with no friction during the opening and closing process, comprising a valve body (1), a valve cover (2), a valve stem (3), and a gate assembly, wherein the valve cover (2) is arranged above the valve body (1), and the valve stem (3) passes through the valve cover (2) and is connected to the gate assembly; Features: The gate assembly comprises two gates (4) arranged in parallel, a pressure relief hole (41) being formed on the gates (4), two symmetrically arranged top cores (5) being arranged between the two gates (4), the top cores (5) being slidably matched with the gates (4) and corresponding to the pressure relief holes (41); The outer ring of the top core (5) is formed with an external thread (51), and two locking rings (6) are provided between the two gate plates (4). The two locking rings (6) are respectively threadedly matched with the two top cores (5), and the two locking rings (6) are respectively linked to the valve stem (3) through two connecting rods (7). The valve stem (3) can drive the locking ring (6) to rotate and drive the top core (5) to slide linearly along the gate plate (4). The two top cores (5) have a first position in which the sealing pressure relief hole (41) is opened to both sides and the gate plate (4) is driven to maintain sealing with the valve body (1), and a second position in which the two top cores are retracted to the middle to make the pressure relief hole (41) conductive.

2. The double-plate gate valve with frictionless switching process according to claim 1 is characterized in that: An annular mounting boss (42) is formed on the inner side surface of the gate plate (4), one end of the top core (5) is inserted into the annular mounting boss (42), and a first sealing ring (81) is provided between the top core (5) and the inner wall of the annular mounting boss (42); the lock ring (6) is sleeved on the annular mounting boss (42), and a second sealing ring (82) is provided between the lock ring (6) and the annular mounting boss (42); the two lock rings (6) are tightly fitted, and a third sealing ring (83) is provided between the two lock rings (6); A pressure relief channel (52) is formed in the top core (5); the pressure relief channels (52) of the two top cores (5) are connected via a connecting pipe (9), and a sealing sliding fit is formed between the connecting pipe (9) and the pressure relief channel (52).

3. The double-plate gate valve with frictionless switching process according to claim 1 is characterized in that: An annular groove (61) is formed on the end surface of one of the locking rings, and an annular boss (62) is correspondingly formed on the other locking ring. The two locking rings are plugged into each other via the annular groove (61) and the annular boss (62).

4. The double-plate gate valve with frictionless switching process according to claim 1, characterized in that: A conical sealing surface (53) is formed at the end of the top core (5), and a conical seal is formed between the top core (5) and the pressure relief hole (41).

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