Lifting type three-way plug valve

Abstract

The lifting type three-way plug valve comprises a valve body, a valve cover and a valve rod, the valve cover is arranged at the upper end of the valve body, and the lifting type three-way plug valve is characterized in that a three-way flow channel and a plug cock for switching the flow channel are arranged in the valve body, the valve rod is arranged on the valve cover in a rotating and lifting penetrating mode, the lower end of the valve rod is connected with the plug cock, and the upper end of the valve rod is connected with a first hand wheel. The valve rod is driven by a first hand wheel to rotate, the first hand wheel is provided with a locking structure, and a lifting mechanism is arranged on one side of the valve rod. The utility model realizes the beneficial effect of zero abrasion of a sealing pair, and has the advantages of reliable sealing, small opening and closing torque, long service life and the like.

Description

Technical Field

[0001] The utility model relates to an improved invention of a plug valve, in particular to an improved invention of a lifting three-way plug valve. Background Art

[0002] In actual use of the switching valve with an existing plug structure, the plug is driven by a handwheel to rotate on the sealing surface of the valve body. Under the action of pressure, there is friction and wear between the plug and the sealing surface, so there are defects such as large opening and closing torque and short service life. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a lifting three-way plug valve based on disengagement switching and zero wear of the sealing pair.

[0004] In order to solve the above technical problems, the utility model is implemented by adopting the following technical solutions: this kind of lifting three-way plug valve includes a valve body, a valve cover and a valve stem, the valve cover is arranged on the upper end of the valve body, and is characterized in that: a three-way flow channel and a switching flow channel plug are arranged in the valve body, the valve stem can be rotatably and lifted and lowered and is penetrated on the valve cover, the lower end of the valve stem is connected to the plug, the upper end of the valve stem is connected to a first hand wheel, the valve stem is driven to rotate by the first hand wheel, and the first hand wheel is equipped with a locking structure, and a lifting mechanism is arranged on one side of the valve stem.

[0005] The lifting mechanism includes a valve stem nut, a second hand wheel, and a driving shaft. The valve stem nut can rotate circumferentially and an axial limit sleeve is arranged on the upper section of the valve stem. The driving shaft is arranged horizontally and can be rotatably arranged on a box body. The box body is arranged above the valve cover through a bracket, and a valve stem nut lifting and lowering guide structure is provided on the box body. The outer end of the driving shaft is connected to the second hand wheel, and the inner end of the driving shaft is provided with a first bevel gear. The corresponding valve stem nut is threadedly connected with a second bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0006] The locking structure includes a sleeve fixedly inserted on the first hand wheel, a positioning rod movably inserted in the sleeve, a compression spring is arranged between the positioning rod and the sleeve, the upper end of the positioning rod is arranged as a driving end, the lower end of the positioning rod is arranged as a locking end, a positioning plate is arranged at the corresponding upper end of the box body, a plurality of locking holes are arranged on the positioning plate, and the locking holes cooperate with the locking end.

[0007] The three-way flow channel includes a left flow channel, a right flow channel and a lower flow channel which are interconnected, and each flow channel opening is provided with a docking flange.

[0008] The beneficial effect of the utility model is that the improved lifting three-way plug valve adopts a technical design that adds a plug axial lifting mechanism and lifts the plug first and separates it from the valve body sealing surface during switching. During the switching operation, the sealing pair is in a disengaged state, achieving the beneficial effect of zero wear of the sealing pair. At the same time, it has the technical characteristics of reliable sealing, small opening and closing torque, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Figure 2 It is a partial enlarged view of the utility model. DETAILED DESCRIPTION

[0012] The accompanying drawings show the structure of the utility model, and the following further describes its relevant details in conjunction with the accompanying drawings. Figure 1-2 The lifting three-way plug valve includes a valve body 1, a valve cover 2 and a valve stem 3. The valve cover 2 is arranged on the upper end of the valve body 1, and the sealing cover of the valve cover 2 is arranged on the upper end of the valve body 1. A three-way flow channel 4 and a plug 5 for switching the flow channel are arranged in the valve body 1. The plug 5 is used to select two flow channels in the vertical direction. The valve stem 3 can be rotatably and lifted and passed through the valve cover 2. The lower end of the valve stem 3 is connected to the plug 5, and the upper end of the valve stem 3 is connected to a first hand wheel 6. The valve stem 3 is driven to rotate by the first hand wheel 6, and the first hand wheel 6 is equipped with a locking structure 7. A lifting mechanism 8 is arranged on one side of the valve stem 3.

[0013] The working principle of the utility model is that when switching, the valve stem 3 and the plug 5 are first lifted by the lifting mechanism 8 to separate the sealing surface of the plug 5 and the valve body 1, and then the plug 5 is driven to rotate by the first hand wheel 6 to realize the rapid switching of the three-way flow channel 4. This method can effectively avoid the wear between the plug 5 and the sealing surface, reduce maintenance costs, and has a small opening and closing torque. At the same time, when the valve is closed, the lifting mechanism 8 applies downward pressure to the valve stem 3 and the plug 5 to increase the sealing force between the plug 5 and the sealing surface, thereby improving the sealing performance.

[0014] As a further improved specific implementation method, the lifting mechanism 8 includes a valve stem nut 81, a second hand wheel 82, and a drive shaft 83. The valve stem nut 81 can rotate circumferentially and is axially limited and sleeved on the upper section of the valve stem 3. The drive shaft 83 is arranged horizontally and rotatably set on a box body 84. The box body 84 is arranged above the valve cover 2 through a bracket, and a valve stem nut 81 lifting and lowering guide structure is provided on the box body 84. The lifting and lowering guide structure is preferably a longitudinal guide groove and a guide rod, which limits the rotation of the valve stem nut 81 and realizes lifting and lowering guidance. The outer end of the drive shaft 83 is connected to the second hand wheel 82, and the inner end of the drive shaft 83 is provided with a first bevel gear. The corresponding valve stem nut 81 is threaded with a second bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0015] The working principle of the lifting mechanism 8 is that the second hand wheel 82 drives the driving shaft 83 to rotate, and the first bevel gear thereon drives the second bevel gear to rotate, and the threaded valve stem nut 81 driven by the second bevel gear, and the corresponding valve stem nut 81 is lifted and lowered under the action of the lifting guide structure, thereby driving the valve stem 3 and the plug 5 to lift and lower, and the valve stem 3 and the valve stem nut 81 can be relatively rotatable, so the lifting and rotation will not interfere with each other.

[0016] As a further improved specific implementation method, the locking structure 7 includes a sleeve 71 fixedly inserted on the first hand wheel 6, and a positioning rod 73 movably inserted in the sleeve 71, a compression spring 72 is provided between the positioning rod 73 and the sleeve 71, the upper end of the positioning rod 73 is set as a driving end, and the lower end of the positioning rod 73 is set as a locking end, and a positioning plate 74 is provided at the corresponding upper end of the box body, and a plurality of locking holes 75 are provided on the positioning plate 74, and the locking holes 75 cooperate with the locking end.

[0017] When the locking structure 7 is working, the positioning rod 73 moves downward under the action of the clamping spring 72 and presses against the first hand wheel. As the first hand wheel rotates, the lower end of the positioning rod 73 extends into the locking hole 75 of the positioning plate 74, thereby locking the first hand wheel 6 and locking the first hand wheel 6 in the position where the three-way flow channel 4 switches to conduction. The positioning rod 73 is pulled up to overcome the clamping spring 72, so that the lower end of the positioning rod 73 is disengaged from the locking hole 75, and the first hand wheel 6 can continue to be rotated.

[0018] As a further improved specific implementation, the three-way flow channel 4 includes a left flow channel, a right flow channel and a lower flow channel that are interconnected, and each flow channel opening is provided with a docking flange.

[0019] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lifting three-way plug valve comprises a valve body, a valve cover and a valve stem, wherein the valve cover is arranged on the upper end of the valve body, and is characterized in that: The valve body is provided with a three-way flow channel and a plug for switching the flow channel. The valve stem can be rotatably and lifted and lowered and is penetrated on the valve cover. The lower end of the valve stem is connected to the plug, and the upper end of the valve stem is connected to a first hand wheel. The valve stem is driven to rotate by the first hand wheel, and the first hand wheel is equipped with a locking structure. A lifting mechanism is provided on one side of the valve stem.

2. The lifting three-way plug valve according to claim 1, characterized in that: The lifting mechanism includes a valve stem nut, a second hand wheel, and a driving shaft. The valve stem nut can rotate circumferentially and an axial limit sleeve is arranged on the upper section of the valve stem. The driving shaft is arranged horizontally and can be rotatably arranged on a box body. The box body is arranged above the valve cover through a bracket, and a valve stem nut lifting and lowering guide structure is provided on the box body. The outer end of the driving shaft is connected to the second hand wheel, and the inner end of the driving shaft is provided with a first bevel gear. The corresponding valve stem nut is threadedly connected with a second bevel gear, and the second bevel gear is meshed with the first bevel gear.

3. The lifting three-way plug valve according to claim 1, characterized in that: The locking structure includes a sleeve fixedly inserted on the first hand wheel, a positioning rod movably inserted in the sleeve, a compression spring is arranged between the positioning rod and the sleeve, the upper end of the positioning rod is arranged as a driving end, the lower end of the positioning rod is arranged as a locking end, a positioning plate is arranged at the corresponding upper end of the box body, a plurality of locking holes are arranged on the positioning plate, and the locking holes cooperate with the locking end.

4. The lifting three-way plug valve according to claim 1, characterized in that: The three-way flow channel includes a left flow channel, a right flow channel and a lower flow channel which are interconnected, and each flow channel opening is provided with a docking flange.

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