Sealing device of plunger valve

Abstract

The sealing device is simple in structure and long in service life and has a filtering function, the sealing device comprises a plunger valve body, a water inlet channel is formed in one end of the plunger valve body, a water outlet channel is formed in the other end of the plunger valve body, and a first valve seat and a second valve seat are arranged at the positions, located on the water inlet channel and the water outlet channel, of the plunger valve body. A first valve rod and a second valve rod are arranged at the positions, located on the first valve seat and the second valve seat, of the plunger valve body, soft sealing devices are arranged at the positions, located on the first valve seat and the second valve seat, of the first valve seat and the second valve seat correspondingly and used for reducing abrasion of the first valve rod and the second valve rod, and a water inlet pipe is connected to the position, located on the water inlet channel, of the plunger valve body. A filter screen for filtering impurities is arranged in the water inlet pipe, and a protection device for protecting the filter screen is also arranged in the water inlet pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve, in particular to a sealing device of plunger valve. BACKGROUND

[0002] As shown in the patent of our company with the publication number CN202023009809.0, an integrated drain valve, which comprises a drain valve body 1' and a plunger valve 2' (also called integrated valve) connected with the drain valve body 1'. Although it can meet the use demand, the company finds that the following two points will occur after long-term use: 1. Since the valve rod on the plunger valve directly contacts and seals with the valve seat by hard sealing, the valve rod is prone to wear and deformation, thereby easily leading to leakage problem, which reduces the service life of the product.

[0003] 2. In long-term use, impurities will enter the inside of the drain valve body and the plunger valve, thereby affecting the use.

[0004] In order to solve this problem, the present application is produced. SUMMARY

[0005] Therefore, in view of the above problems, the present application provides a sealing device of plunger valve which has simple structure, high service life and filtering function.

[0006] To solve the above technical problems, the present application adopts the following solution: a sealing device of plunger valve, which comprises a plunger valve body, one end of the plunger valve body is provided with a water inlet channel, the other end is provided with a water outlet channel, the plunger valve body is provided with a first valve seat and a second valve seat at the positions of the water inlet channel and the water outlet channel, the plunger valve body is provided with a first valve rod and a second valve rod at the positions of the first valve seat and the second valve seat, soft sealing devices are respectively arranged at the positions of the first valve seat and the second valve seat to reduce the wear of the first valve rod and the second valve rod, a water inlet pipe is connected to the plunger valve body at the water inlet channel, a filter screen for filtering impurities is arranged in the water inlet pipe, and a protection device for protecting the filter screen is also arranged in the water inlet pipe.

[0007] Further improvement is that the valve seat comprises graphite sheets and stainless steel sheets, the graphite sheets and the stainless steel sheets are sequentially stacked and pressed to form a piston layer sheet type sealing ring, the sealing ring is arranged at the positions of the first valve seat and the second valve seat, and valve rod channels are formed in the graphite sheets and the stainless steel sheets for the valve rod to pass through.

[0008] Further improvement is that the protection device comprises a fixed rod, the fixed rod is fixedly arranged in the water inlet pipe, a plurality of rotating rods are rotatably arranged on the fixed rod from top to bottom, a blocking plate is arranged on each rotating rod, and a rotating device is arranged in the fixed rod to drive the rotating rods to rotate.

[0009] Further improvement is that the rotating device comprises a driving rod, the driving rod is rotatably arranged in a fixed rod, the fixed rod is provided with a rotating channel at the position of the rotating rod, the driving rod is provided with a worm at the position of the rotating channel, the rotating rod is provided with a worm wheel, the worm and the worm wheel are in meshing transmission, and the water inlet pipe is provided with a rotating driving device for driving the rotating rod.

[0010] Further improvement is that the driving device comprises symmetrically arranged sliding blocks, the sliding blocks are arranged at both ends of the filter screen, the water inlet pipe is provided with a sliding channel, the sliding blocks are slidably arranged in the sliding channel, the water inlet pipe is provided with a rotating channel at both ends, the driving rod is arranged in the rotating channel at both ends, the driving rod is provided with a pull rope around the driving rod and located in the rotating channel, the other end of the pull rope is connected with the sliding block, and the driving rod is further provided with a clockwork spring for rotating back and rotating back.

[0011] Further improvement is that the sliding rod is slidably arranged in the sliding channel of the water inlet pipe, the sliding rod is fixedly provided with a blocking block, the blocking block is located in the sliding channel, and the blocking block is provided with a reset member.

[0012] Further improvement is that the reset member is a reset spring, the reset spring is sleeved on the sliding rod, one end of the reset spring is connected with the blocking block, and the other end of the reset spring is connected with the inner wall of the sliding channel.

[0013] Further improvement is that four butterfly springs are arranged between the sealing ring and the valve cover of the plug valve to provide stable pre-tightening force for the valve.

[0014] By adopting the foregoing technical scheme, the application has the following beneficial effects: The structure is simple, the service life is long, and the filter function is provided. When used, the valve seat is made of stacked and pressed graphite sheets and stainless steel sheets, so that the valve seat changes from a hard seal to a soft seal structure, so that the first valve rod and the second valve rod are not easy to wear when penetrating into the sealing ring, thereby improving the service life of the first valve rod and the second valve rod, preventing the first valve rod and the second valve rod from being easily deformed, and further improving the service life. The filter screen can filter impurities in the water flow, thereby preventing impurities from entering the plug valve or the steam trap, preventing the plug valve from being blocked and rusted, and further improving the service life. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a steam trap structure schematic diagram of the background technology of the application.

[0016] Figure 2 It is a sectional view of the plug valve structure schematic diagram of the embodiment of the application.

[0017] Figure 3is the schematic diagram of the amplification structure of the embodiment A of the present application.

[0018] Figure 4 is the schematic diagram of the blocking plate structure of the present application. DETAILED DESCRIPTION

[0019] The present application is further illustrated with reference to the accompanying drawings and specific embodiments.

[0020] REFERENCE Figures 1-4 The present application discloses a sealing device of a plunger valve, which comprises a plunger valve body 1, a water inlet channel is arranged at one end of the plunger valve body 1, a water outlet channel 3 is arranged at the other end of the plunger valve body 1, a first valve seat and a second valve seat are arranged at the positions of the water inlet channel and the water outlet channel 3 of the plunger valve body 1, a first valve rod and a second valve rod 6 are arranged at the positions of the first valve seat and the second valve seat of the plunger valve body 1, soft sealing devices are arranged at the positions of the first valve seat and the second valve seat respectively for reducing the abrasion of the first valve rod and the second valve rod 6, a water inlet pipe 2 is connected to the plunger valve body 1 at the water inlet channel, a filter screen 7 for filtering impurities is arranged in the water inlet pipe 2, and a protection device for protecting the filter screen 7 is further arranged in the water inlet pipe 2.

[0021] Specifically, the valve seat comprises a graphite sheet and a stainless steel sheet, the graphite sheet and the stainless steel sheet are sequentially stacked and press-bonded to form a piston laminated sealing ring 4, the sealing ring 4 is arranged at the positions of the first valve seat and the second valve seat, and valve rod channels are formed in the graphite sheet and the stainless steel sheet for the valve rods to pass through. When in use, the valve seat is formed by stacking and press-bonding the graphite sheet and the stainless steel sheet, so that the valve seat changes from a hard sealing structure to a soft sealing structure, thereby preventing the first valve rod and the second valve rod 6 from being easily abraded when passing through the sealing ring 4, improving the service life of the first valve rod and the second valve rod 6, and further preventing the first valve rod and the second valve rod 6 from being easily deformed to further improve the service life.

[0022] Specific, the protection device includes fixed rod 12, drive rod 11, sliding block 9, the fixed rod 12 is fixedly arranged in the water inlet pipe 2, a plurality of rotating rods 13 are rotatably arranged on the fixed rod 12 from top to bottom, the blocking plate 14 is arranged on the rotating rod 13, the drive rod 11 is rotatably arranged in the fixed rod 12, the rotating channel is arranged at the position of the rotating rod 13 of the fixed rod 12, the worm is arranged at the position of the rotating channel of the drive rod 11, the worm wheel 15 is arranged on the rotating rod 13, the symmetrical sliding blocks 9 are arranged at both ends of the filter screen 7, the sliding channel 8 is arranged on the water inlet pipe 2, the sliding block 9 is slidably arranged in the sliding channel 8, the return channel is arranged at both ends of the water inlet pipe 2, the end portions of the drive rod 11 are located in the return rotating channel, the pull rope 10 is arranged on the drive rod 11 and located in the return channel, the other end of the pull rope 10 is connected with the sliding block 9, the drive rod 11 is further provided with a spring (not shown in the figure) which is rotated and returned to reset. Wherein, the filter screen 7 can filter impurities in the water flow, so as to avoid impurities entering the plunger valve or the steam trap, thereby preventing the plunger valve from being blocked and rusted, and further improving the service life. When the plunger valve is closed, water hammer enters the water inlet pipe 2 and impacts the filter screen 7, the filter screen 7 slides at this time, driving the sliding block 9 to slide, the sliding block 9 slides to pull the pull rope 10, when the pull rope 10 is pulled, the drive rod 11 is rotated, the drive rod 11 is rotated to drive the worm to rotate and drive the spring, the worm is engaged with the worm wheel 15 to drive the rotating rod 13 to rotate, the rotating rod 13 drives the blocking plate 14 to rotate, so that the blocking plate 14 rotates from the horizontal position to the vertical position of the water inlet pipe 2, thereby blocking the subsequent water hammer, so as to protect the filter screen 7 and improve the service life of the filter screen 7. When the water hammer ends, the spring returns to reset, drives the drive rod 11 to reverse, thereby driving the rotating rod 13 to reverse, the rotating rod 13 drives the blocking plate 14 to reset, and the drive rod 11 reverses to drive the pull rope 10 to reset towards the drive rod 11, thereby pulling the filter screen 7 to reset. When the blocking plate 14 resets, it changes from the vertical state to the horizontal state, avoiding the influence of the blocking plate 14 on the water flow.

[0023] In order to prevent the filter screen 7 from being excessively pushed by the water hammer to excessively overturn the blocking plate 14, the water inlet pipe 2 is arranged to slide in the sliding channel 8 and is provided with a sliding rod 17, a blocking block 16 is fixedly arranged on the sliding rod 17, the blocking block 16 is arranged in the sliding channel 8, a return spring 18 is arranged on the blocking block 16, the return spring 18 is sleeved on the sliding rod 17, one end of the return spring 18 is connected with the blocking block 16, and the other end of the return spring 18 is connected with the inner wall of the sliding channel 8. When the blocking plate 14 is overturned and the water hammer continues to push the filter screen 7 to slide, the sliding block 9 is resisted by the blocking block 16, so that the sliding rod 17 is pushed to slide and the spring is compressed, thereby further reducing the water hammer effect and reducing the excessive overturning of the blocking plate 14, and the effect of blocking the water hammer by the blocking plate 14 is improved.

[0024] In order to further improve the stable and reliable pre-tightening force of the valve cover, four butterfly springs 5 are arranged between the sealing ring 4 and the valve cover of the plunger valve to provide stable pre-tightening force for the valve.

[0025] The basic principles and main features of the present application and its advantages are shown and described above, and those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A sealing device for a plunger valve, comprising a plunger valve body, wherein one end of the plunger valve body is provided with a water inlet channel and the other end with a water outlet channel, the plunger valve body is provided with a first valve seat and a second valve seat at the positions of the water inlet channel and the water outlet channel, and the plunger valve body is provided with a first valve stem and a second valve stem at the positions of the first valve seat and the second valve seat, characterized in that: The first valve seat and the second valve seat are respectively provided with soft sealing devices to reduce the wear of the first valve stem and the second valve stem. The plunger valve body is located in the water inlet channel and connected to the water inlet pipe. The water inlet pipe is provided with a filter screen for filtering impurities. The water inlet pipe is also provided with a protective device to protect the filter screen.

2. The sealing device for a plunger valve according to claim 1, characterized in that: The valve seat includes a graphite sheet and a stainless steel sheet, which are stacked and pressed together to form a piston-layer sealing ring. The sealing ring is located at the first valve seat and the second valve seat. A valve stem channel is provided on the graphite sheet and the stainless steel sheet for the valve stem to pass through.

3. The sealing device for a plunger valve according to claim 1, characterized in that: The protective device includes a fixed rod, which is fixedly installed inside the water inlet pipe. Several rotating rods are rotatably inserted through the fixed rod from top to bottom. A baffle plate is provided on the rotating rod. A rotating device that drives the rotating rods to rotate is provided inside the fixed rod.

4. The sealing device for a plunger valve according to claim 3, characterized in that: The rotating device includes a drive rod that rotatably passes through a fixed rod. The fixed rod has a rotation channel at the position of the rotating rod. The drive rod has a worm gear at the position of the rotation channel. The rotating rod has a worm wheel, and the worm gear and worm wheel mesh and drive each other. The water inlet pipe is equipped with a drive device to rotate the rotating rod.

5. The sealing device for a plunger valve according to claim 4, characterized in that: The driving device includes symmetrically arranged sliding blocks at both ends of the filter screen. A sliding channel is provided on the water inlet pipe, and the sliding blocks are slidably disposed within the sliding channel. Rotation channels are provided at both ends of the water inlet pipe. The ends of the driving rod are located within the return rotation channel. A pull rope is wound around the driving rod and located within the rotation channel. The other end of the pull rope is connected to the sliding block. A spring spring is also provided on the driving rod to return to its original position after rotation.

6. A sealing device for a plunger valve according to claim 5, characterized in that: The water inlet pipe is slidably inserted through the sliding channel with a sliding rod. A blocking block is fixed on the sliding rod. The blocking block is located in the sliding channel and has a return component.

7. A sealing device for a plunger valve according to claim 6, characterized in that: The return component is a return spring, which is sleeved on the sliding rod. One end of the return spring is connected to the blocking block, and the other end of the return spring is connected to the inner wall of the sliding channel.

8. A sealing device for a plunger valve according to claim 2, characterized in that: Four butterfly springs are provided between the sealing ring and the valve cover of the plunger valve to provide a stable preload force to the valve.

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