A gate valve for PTA circulating water

Abstract

The invention relates to the field of valve technology, and in particular to a gate valve for PTA circulating water. A convex ring is arranged on a valve shell on a water inlet side, a water hammer sleeve pipe fitting is sleeved on the convex ring, the convex ring and the water hammer sleeve pipe fitting are connected by embedding bolts, a sealing ring is arranged in the valve shell, a connecting rod is arranged on a valve disc, the connecting rod penetrates the sealing ring, a limiting iron block is arranged on the top of the connecting rod, an annular electromagnet block is arranged inside a valve cover, a vent pipe is arranged on the top of the valve cover, and the top of the valve disc is connected to the water hammer sleeve pipe fitting by a high-strength flexible line. The invention solves the technical problems that when a traditional machine check valve is cut off, a pipe wall and a rotating impeller of a pump body are strongly impacted by a circulating water medium, a water hammer phenomenon is generated due to the inertia of water flow when the valve is opened and closed, causing the valve disc to deform, and the circulating water pipeline is damaged or the impeller of the pump body is damaged by liquid backflow when the water pump stops working.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a gate valve used for PTA circulating water. Background Art

[0002] In the PTA production process, circulating water, as a key process medium, is as important as the "blood" of the production system because of its delicate nature and extremely high requirements for process stability. Relying on the powerful thrust of the circulating water pump, circulating water is continuously transported to every corner of the device and participates in the operation of many complex process links. Due to the large scale of PTA production, its demand for circulating water is extremely considerable.

[0003] In terms of protection, when leakage occurs, the valve will play a role, but the existing check valve adopts the traditional mechanical structure design. When cut off, the pipe wall and the rotating impeller of the pump body will be subjected to strong impact of the circulating water medium. In addition, when the valve is suddenly closed or opened, the pressure in the pipeline changes sharply due to the inertia of the water flow, thus generating water hammer phenomenon. The instantaneous high-pressure impact force generated by the water hammer will impact the valve disc of the check valve, and the valve disc is very likely to be deformed, worn or even broken under repeated impacts.

[0004] When the circulating water pipeline is damaged or the water pump stops working, liquid backflow is inevitable. This liquid backflow will immediately produce a strong reverse force on the connected circulating water pump, directly causing the pump to reverse. During the pump reversal, the pump impeller is subjected to huge water flow impact, and it is very easy to suffer serious damage such as blade breakage and deformation. This series of chain reactions caused by water hammer problems will not only greatly increase the equipment maintenance costs, but also cause the PTA production process to be interrupted, leading to a series of serious economic losses and production difficulties such as production stagnation, reduced production capacity and waste of raw materials, which will bring great negative effects and challenges to the production operations of related companies. Therefore, in the PTA production process, effectively solving the water hammer problem of the circulating water system and optimizing the design and maintenance strategy of the check valve have become the key issues that urgently need to be solved in the current technical field. Summary of the invention

[0005] The purpose of the present invention is to provide a gate valve for PTA circulating water, which solves the technical problems that the pipe wall and the rotating impeller of the pump body are strongly impacted by the circulating water medium when the traditional check valve is cut off, the water hammer phenomenon caused by the inertia of the water flow when the valve is opened and closed causes the valve disc to deform, and the circulating water pipeline is damaged or the liquid flows back when the water pump stops working, causing the pump body impeller to be damaged.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a gate valve for PTA circulating water, comprising a valve housing, a valve disc and a valve cover, a valve disc slidingly arranged in the valve housing, the valve housing and the valve cover being connected by bolts, characterized in that: a convex ring is arranged on the valve housing on the water inlet side, a water hammer prevention sleeve pipe fitting is sleeved on the convex ring, the convex ring and the water hammer prevention sleeve pipe fitting are connected by embedded bolts, a sealing ring is arranged in the valve housing, a connecting rod is arranged on the valve disc, the connecting rod passes through the sealing ring, a limiting iron block is arranged on the top of the connecting rod, an annular electromagnet block is arranged inside the valve housing, an air vent is arranged on the top of the valve cover, and the top end of the valve disc is connected to the water hammer prevention sleeve pipe fitting by a high-strength flexible wire.

[0007] Preferably, the anti-water hammer sleeve comprises an embedded tube, an elastic barrier and a high-strength flexible wire 2, a group of elastic barrier plates are arranged inside the embedded tube, each group of elastic barrier plates are arranged in a circular array in sequence inside the embedded tube, a wire groove is arranged on the outer tube wall of the embedded tube, a group of inclined holes, L-shaped ring holes and wire holes are arranged on the embedded tube, one end of the high-strength flexible wire 2 is fixedly connected to the elastic barrier plate, and the high-strength flexible wire 2 passes through the inclined hole, the L-shaped ring hole and the wire hole and is connected and fixed to the high-strength flexible wire 1.

[0008] Preferably, connecting flanges are provided on both sides of the valve housing.

[0009] Preferably, a power-off-opening electromagnetic valve is provided on the air vent pipe.

[0010] Preferably, a handle is embedded in the limiting iron block.

[0011] In summary, the present invention has the following beneficial effects:

[0012] The check valve of the present invention is arranged at the front side of the pump body at the outlet of water, the anti-water hammer sleeve is sleeved in the circulation pipe and is tightly attached to the inner wall of the external circulation water pipe, the valve housing is fixedly connected to the external circulation water pipe and connected to another part of the circulation water pipe, and the anti-water hammer sleeve also has a protective function. When the power is cut off to cut off the water flow, the water hammer phenomenon can be effectively prevented from occurring, the impact of the circulating water on the pipe wall and the pump body during the cutoff is reduced, and the valve disc is prevented from being deformed due to the water hammer. When the downstream equipment of the pipeline is repaired, the annular electromagnet block is powered off, the air enters through the air permeable pipe, the limiting iron block descends according to its own gravity, and drives the valve disc to insert into the bottom of the valve housing to cut off the circulation of the circulating water. At the same time, the external pump body is closed, and the low-level water impacts the pump body fan blades. At this time, the tensioned high-strength flexible line 1 and high-strength flexible line 2 become loose, and the anti-water hammer sleeve opens to work, hindering the back and forth flow of the water flow in the pipe, preventing the large inertial water flow from impacting the circulation water pipe and the pump body fan blades, and realizing double protection. In addition, a power-off open type electromagnetic valve is provided, which opens when the circulating water is cut off, and the external gas slowly enters the valve cover and valve housing, so that the limit iron block and the valve disc slowly close with the help of their own gravity to overcome the water pressure, reducing the impact of water flow inertia on the pipeline. During assembly, the device is first installed in the circulating water pipeline, and the annular electromagnet block is energized. The staff passes through the annular electromagnet block and pulls up the limit iron block with a handle, so that the valve disc is pulled up and sucked by the annular electromagnet block, and then the valve cover and the power-off open type electromagnetic valve are installed. It is easy to reset. The present invention has a strong practical value, successfully reduces the inertial impact generated when the circulating water is cut off, and effectively protects the water pipe wall, the rotating impeller of the pump body and the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the present invention;

[0014] Figure 2 is a cross-sectional view of a component of the present invention;

[0015] Figure 3 The present invention Figure 2 A magnified image of point A;

[0016] Figure 4 is a cross-sectional view of the interior of the valve body of the present invention;

[0017] Figure 5 is a three-dimensional view of the valve body of the present invention;

[0018] Figure 6 is a disassembled view of the valve body assembly of the present invention;

[0019] Figure 7 It is a stereoscopic view of the external pump body and impeller of the prior art.

[0020] In the figure, 1. valve housing; 2. valve disc; 3. valve cover; 16. bolt; 11. convex ring; 12. inner hole; 4. anti-water hammer sleeve fitting; 40. outer hole; 13. embedded bolt; 14. sealing ring; 21. connecting rod; 22. limit iron block; 23. handle; 31. annular electromagnet block; 32. vent pipe; 24. high-strength flexible wire 1; 15. connecting flange; 41. embedded pipe; 42. elastic barrier; 43. high-strength flexible wire 2; 44. wire groove; 45. inclined hole; 46. L-shaped ring hole; 47. wire hole. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0023] In one embodiment, referring to Figures 1 to 6 A gate valve for PTA circulating water comprises a valve housing 1, a valve disc 2 and a valve cover 3, wherein the valve disc 2 is slidably arranged in the valve housing 1, and the valve housing 1 and the valve cover 3 are connected by bolts 16. The gate valve is characterized in that: a convex ring 11 is arranged on the valve housing 1 on the water inlet side, a connecting inner hole 12 is arranged on the convex ring 11, a waterproof hammer sleeve pipe fitting 4 is sleeved on the convex ring 11, a connecting outer hole 40 is arranged on the waterproof hammer sleeve pipe fitting 4, the convex ring 11 and the waterproof hammer sleeve pipe fitting 4 are connected by embedding bolts 13, a sealing ring 14 is arranged in the valve housing 1, and a sealing ring 14 is arranged on the valve disc 2. A connecting rod 21 is provided, and the connecting rod 21 passes through the sealing ring 14. A limiting iron block 22 is provided on the top of the connecting rod 21, and a handle 23 is embedded in the limiting iron block 22. An annular electromagnet block 31 is provided inside the valve housing 1, and an air vent 32 is provided on the top of the valve cover 3. The limiting iron block 22 and the valve disc 2 can overcome the water pressure to achieve closing by their own gravity. The top of the valve disc 2 is connected to the anti-water hammer sleeve 4 through a high-strength flexible line 24. Connecting flanges 15 are provided on both sides of the valve housing 1, and a power-off opening type solenoid valve 33 is provided on the air vent 32.

[0024] In one embodiment, referring to Figures 1 to 7 The circulating water is transported to the next unit for use through the pump body, the check valve of the present invention is arranged on the front side of the water outlet of the pump body, the anti-water hammer sleeve pipe fitting 4 is sleeved in the circulating pipe, the anti-water hammer sleeve pipe fitting 4 is tightly attached to the inner wall of the external circulating water pipe, the valve housing 1 is fixedly connected to the external circulating water pipe, and the other side is connected to the circulating water pipe of another part. The present invention can effectively prevent the water hammer phenomenon from occurring when the power is off, reduce the impact of the circulating water medium on the pipe wall and the rotating impeller of the pump body when cutting off, and avoid the water hammer phenomenon caused by the inertia of the water flow when the valve is opened and closed, resulting in the deformation of the valve disc.

[0025] In one embodiment, referring to Figures 4 to 6 When it is necessary to repair the equipment downstream of the pipeline, the annular electromagnet block 31 needs to be powered off, and air enters from the vent pipe 32. At this time, the limit iron block 22 drops due to its own gravity, and the valve flap 2 is inserted into the bottom of the valve shell 1 to prevent the circulation of circulating water. At this time, the external pump body is also closed, and the low-level water impacts the pump body fan blades while closing. When the valve flap 2 and the limit iron block 22 drop, the tensioned high-strength flexible line 1 24 and high-strength flexible line 2 43 become loose, and the anti-water hammer sleeve fitting 4 opens to work, hindering the back and forth flow of water in the pipe, thereby avoiding the inertial water flow directly impacting the pump body fan blades. The provision of the anti-water hammer sleeve fitting 4 can effectively prevent the large inertial water flow from impacting the circulating water pipe, thus providing double protection.

[0026] In one embodiment, referring to Figure 1 and Figure 6 A power-off opening type solenoid valve 33 is provided. When the circulating water is cut off, the power-off opening type solenoid valve 33 opens, and the external gas slowly enters the valve cover 3 and the valve shell 1. The self-gravity of the limiting iron block 22 and the valve disc 2 can overcome the water pressure to achieve closing. At this time, the impact of the water flow inertia on the pipeline is relatively small.

[0027] In one embodiment, referring to Figures 2 to 6 The anti-water hammer sleeve 4 includes an embedded tube 41, an elastic barrier 42 and a high-strength flexible wire 43. A group of elastic barriers 42 are arranged inside the embedded tube 41. Each group of elastic barriers 42 is arranged in a circular array in the embedded tube 41 in sequence. A wire groove 44 is arranged on the outer tube wall of the embedded tube 41. A group of inclined holes 45, L-shaped ring holes 46 and wire holes 47 are arranged on the embedded tube 41. One end of the high-strength flexible wire 43 is fixedly connected with the elastic barrier 42. The high-strength flexible wire 43 passes through the inclined hole 45, the L-shaped ring hole 46 and the wire hole 47 and is connected and fixed with the high-strength flexible wire 1 24.

[0028] In one embodiment, referring to Figures 2 to 6 The valve flap 2 is inserted into the bottom of the valve housing 1 to block the circulation of circulating water. When the valve flap 2 and the limiting iron block 22 descend, the tensioned high-strength flexible line 1 24 and high-strength flexible line 2 43 become loose, and the bent elastic barrier 42 stretches open to cut off the movement of the water flow. The bending direction of the elastic barrier 42 is consistent with the outlet direction of the circulating water. The last section of the elastic barrier 42 pops open to effectively prevent the water flow from impacting the fan blades of the pump body.

[0029] In one embodiment, referring to Figure 6 During the assembly process, the device is installed in the circulating water pipeline, the annular electromagnet block 31 is energized, and the staff passes through the annular electromagnet block 31 and pulls up the limit iron block 22 through the handle 23. The valve disc 2 is pulled up from the valve housing 1 and is sucked by the annular electromagnet block 31. Then the valve cover 3 and the power-off opening type solenoid valve 33 are installed on the valve housing 1.

Claims

1. A gate valve for PTA circulating water, comprising a valve housing (1), a valve flap (2) and a valve cover (3), wherein the valve flap (2) is slidably arranged in the valve housing (1), and the valve housing (1) and the valve cover (3) are connected by bolts (16), characterized in that: A convex ring (11) is provided on the valve housing (1) on the water inlet side, and a water hammer sleeve (4) is sleeved on the convex ring (11). The convex ring (11) and the water hammer sleeve (4) are connected by an embedded bolt (13). A sealing ring (14) is provided in the valve housing (1). A connecting rod (21) is provided on the valve disc (2). The connecting rod (21) passes through the sealing ring (14). A limiting iron block (22) is provided on the top of the connecting rod (21). An annular electromagnet block (31) is provided inside the valve housing (1). A vent pipe (32) is provided on the top of the valve cover (3). The top end of the valve disc (2) is connected to the water hammer sleeve (4) by a high-strength flexible wire (24). The component (4) comprises an embedded tube (41), an elastic barrier sheet (42) and a second high-strength flexible wire (43). A group of elastic barrier sheets (42) are arranged inside the embedded tube (41). Each group of elastic barrier sheets (42) is arranged in a circular array in sequence inside the embedded tube (41). A wire groove (44) is arranged on the outer tube wall of the embedded tube (41). A group of inclined holes (45), L-shaped ring holes (46) and wire holes (47) are arranged on the embedded tube (41). One end of the second high-strength flexible wire (43) is fixedly connected to the elastic barrier sheet (42). The second high-strength flexible wire (43) passes through the inclined hole (45), passes through the L-shaped ring hole (46) and the wire hole (47), and is connected and fixed to the first high-strength flexible wire (24).

2. A gate valve for PTA circulating water according to claim 1, characterized in that: Connecting flanges (15) are provided on both sides of the valve housing (1).

3. A gate valve for PTA circulating water according to claim 1, characterized in that: A power-off-opening electromagnetic valve (33) is provided on the vent pipe (32).

4. A gate valve for PTA circulating water according to claim 1, characterized in that: A handle (23) is embedded in the limiting iron block (22).

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