CN204227012U - A kind of top dress interlock three-way switch valve - Google Patents

Abstract

The utility model discloses a top-mounted linkage three-way switching valve, which is characterized in that it comprises an upper and a lower three-way valve and a two-stage turbine operating mechanism; the upper and lower three-way valve bodies are respectively equipped with upper and lower L Type spool, the upper and lower L-shaped spools are fixedly connected with the transmission shaft; the two-stage turbine operating mechanism is installed above the upper three-way valve, and connected with the upper L-shaped spool through the upper valve stem. The L-shaped spool of the top-mounted linkage three-way switching valve adopts a full-bore design, which reduces the resistance of the lubricating oil, thereby achieving the effects of pressure drop, good circulation, and energy saving. And because the L-shaped valve core is only in contact with the sealing ring of the valve seat during the rotation process, it avoids the stuck phenomenon that occurred in the past.

Description

A top-mounted linkage three-way switching valve

technical field

The utility model The utility model relates to a switching device for a lubricating oil supply system of a steam turbine, in particular to a top-mounted linkage three-way switching valve.

Background technique

At present, in the lubricating oil supply system of the steam turbine, a cylindrical plate structure switching valve is usually used, which is installed between the connecting pipes of the two oil coolers. Due to the large resistance of the sleeve type valve core, the friction with the valve body is serious. The whole equipment is mainly processed by welding. Long-term use will cause the size and welding stress to be deformed. The internal transmission is mainly driven by the cam mechanism to move the sleeve, which is easy to get stuck. This kind of switching valve is not easy to operate, and often malfunctions and the valve core is stuck, causing the lubricating oil system to cut off the oil.

Contents of the invention

The purpose of this utility model is to overcome the above-mentioned technical problems and provide a top-mounted linkage three-way switching valve. This switching valve is used as switching equipment between two oil coolers. The oil cut-off feature of the lubricating oil system.

The technical solution for realizing the utility model is: a top-mounted linkage three-way switching valve, which is characterized in that it includes an upper and a lower three-way valve and a two-stage turbine operating mechanism; Upper and lower L-shaped spools, the upper and lower L-shaped spools are fixedly connected by transmission shafts; the two-stage turbine operating mechanism is installed above the upper three-way valve and connected to the upper L-shaped spool through the upper valve stem .

The upper and lower L-shaped spools, transmission shaft and upper valve stem are concentric.

There is a rotary scale on the two-stage turbine operating mechanism. The hand wheel rotates counterclockwise. When it is aligned with the left channel, the right side of the valve is closed, and the left side of the valve is fully open; when the hand wheel is rotated clockwise, it is aligned with the right channel. Closed, the right side of the valve is fully open.

The upper three-way valve consists of an upper valve body, an upper valve cover, an upper L-shaped valve core, a valve seat, a sealing ring, a spring seat, an upper valve stem, a sealing gland, a transitional sealing plate and its O-shaped sealing ring, and a gasket Assembled.

The lower three-way valve consists of a lower valve body, a lower valve cover, a lower L-shaped valve core, a valve seat, a sealing ring, a spring, a spring seat, a transmission shaft, a sealing gland, a bottom cover and its O-shaped sealing ring, and a supporting bearing. , Gasket assembled.

A bracket is installed on the upper three-way valve, and the two-stage turbine operating mechanism is connected to the bracket.

The upper valve body and the transitional sealing plate are welded together, and the transitional sealing plate is connected with the lower three-way valve through bolts and nuts.

The beneficial effects of the utility model are:

1. The L-shaped spool of the top-mounted linkage three-way switching valve adopts a full-bore design, which reduces the resistance of the lubricating oil, thereby achieving the effects of pressure drop, good circulation, and energy saving.

2. During the rotation of the L-shaped valve core, it is only in contact with the sealing ring of the valve seat, which avoids the previous stuck phenomenon.

3. The two-stage turbine operating mechanism is easy to operate. It is easy to turn the handwheel with small operating force.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is an enlarged view of A of Fig. 1;

Labels in the figure: 1—two-stage turbine operating mechanism, 2—bracket, 3—upper valve stem, 4—upper valve body, 5—excessive sealing plate, 6—lower valve cover, 7—lower valve body, 8—bottom cover . O-type sealing ring, 18—sealing ring, 19—spring, 20—gasket, 21—bolt nut, 22—upper three-way valve, 23—lower three-way valve, 24—balance hole, 25—support bearing.

Detailed ways

As shown in Figures 1 and 2: a top-mounted linkage three-way switching valve, including upper and lower three-way valves 22, 23, and a two-stage turbine operating mechanism 1; The upper and lower L-shaped spools 11, 13 are installed respectively, and the upper and lower L-shaped spools 11, 13 are fixedly connected with the transmission shaft 12; the two-stage turbine operating mechanism 1 is installed above the upper three-way valve 22 , connected with the upper L-shaped spool 11 through the upper valve rod 3 . The upper and lower L-shaped spools 11, 13, transmission shaft 12, and upper valve stem 3 are concentric. The two-stage turbine operating mechanism 1 has a rotary score line on it. The hand wheel rotates counterclockwise. When it is aligned with the left port, the right side of the valve is closed, and the left side of the valve is fully open; the hand wheel is rotated clockwise. One side is closed, and the right side of the valve is fully open. The upper three-way valve 22 is composed of an upper valve body 4, an upper valve cover 10, an upper L-shaped valve core 11, a valve seat 14, a sealing ring 18, a spring seat 15, an upper valve stem 3, a sealing gland 16, and a transition sealing plate 5 and its O-shaped sealing ring 17 and gasket 20; the lower three-way valve 23 is composed of the lower valve body 7, the lower valve cover 6, the lower L-shaped valve core 13, the valve seat 14, the sealing ring 18, the spring 19. The spring seat 15, the drive shaft 12, the sealing gland 16, the bottom cover 8 and its O-ring 17, the support bearing 25, and the gasket 20 are assembled. A bracket 2 is installed on the upper three-way valve 22, and the two-stage turbine operating mechanism 1 is connected to the bracket 2. The upper valve body 4 is welded together with the transitional sealing plate 5 , and the transitional sealing plate 5 is connected with the lower three-way valve 23 through bolts and nuts 21 ; the upper and lower three-way valves 22 , 23 have balance holes 24 .

The assembly process of the utility model: when assembling, first assemble the lower three-way valve, put the lower L-shaped valve core 13 into the inner cavity of the lower valve body 7, adjust the position to align with the lower hole of the lower valve body 7, and then install the bottom cover 8 Fix it with hexagon socket head screws, and install the drive shaft 12, seal the lower L-shaped valve core 13 and the lower valve body hole 7 with an O-ring, then install the upper and lower valve covers 6, and the lower valve cover 6 and the lower valve body 7 The gasket 20 seals, and the bolts and nuts 21 connect. Load onto valve seat 14, sealing ring 18, spring seat 15, spring 19, sealing pressure sleeve 16 on both sides at last, and lower valve body 7 and sealing ring 18 are sealed with O-ring 17. Base 9 and lower valve body 7 are spot welded together. After the lower three-way valve is installed, the upper valve body 4 and the transitional sealing plate 5 are welded together, and the transitional sealing plate 5 is connected with the lower three-way valve through bolts and nuts 21 again. Install the upper L-shaped spool 11 and connect it with the transmission shaft 12, adjust the position and install the upper valve stem 3, and then install the upper valve cover 10, the upper valve body 4 and the upper valve cover 10 are connected by bolts and nuts 21, and the upper valve The rod 3 and the upper valve cover 10 are sealed with an O-ring. The upper L-shaped spool 11 and the upper valve body 4 are sealed with an O-ring. Valve seat 14, sealing ring 18, spring seat 15, spring 19, sealing gland 16 are loaded onto both sides at last, and upper valve body 4 and sealing ring 18 are sealed with O-ring 17.

Upper and lower three-way valves 22 and 23 are respectively composed of valve seat 14, sealing ring 18, spring seat 15, spring 19, sealing gland 16 on both sides, and upper valve body 4 and sealing ring 18 form symmetrical seals with O-ring 17. After the upper and lower three-way valves 22 and 23 are assembled, the shell sealing pressure test is carried out. After the test pressure is qualified, the upper three-way valve 22 and the two-stage turbine operating mechanism 1 are assembled, and the bracket 2 is connected to the upper three-way valve 22 by bolts and nuts 21 at first. Then the two-stage turbine operating mechanism 1 is connected to the support 2 through bolts and nuts 21.

The operation method of the utility model is as follows: turn the hand wheel of the two-stage turbine operating mechanism 1, the turbine of the two-stage turbine operating mechanism 1 drives the upper valve stem 3 of the upper three-way valve 22 to move simultaneously, and the transmission shaft 12 transmits the torque to the lower L-shaped valve. The spool 13 rotates 90 degrees, and the two-stage turbine operating mechanism 1 has a rotary engraved line. When it is aligned with the left channel, the hand wheel rotates counterclockwise. When it is aligned with the right channel, the hand wheel rotates clockwise. The top-mounted linkage tee When the switching valve is in use, the lubricating oil enters from the lower inlet of the switching valve. After being cooled by the oil cooler, it enters the bearing lubricating oil supply main pipe from the upper outlet of the switching valve. The position of the valve core determines the corresponding input of the oil cooler. situation. When two oil coolers need to be put into operation at the same time, the two-stage turbine operating mechanism 1 should be rotated to the middle position, and the lubricating oil can enter the two oil coolers respectively through the upper L-shaped spool 11 and the lower L-shaped spool 13 .

Claims (7)

1. a top dress interlock three-way switch valve, is characterized in that: comprise upper and lower three-way valve, twin-stage turbine operation mechanism; Be separately installed with upper and lower L-type spool in described upper and lower three-way valve body, described upper and lower L-type spool transmission shaft is fixedly connected with; Described twin-stage turbine operation mechanism is arranged on the top of three-way valve, is connected with upper L-type spool by upper valve rod.

2. top fills interlock three-way switch valve according to claim 1, it is characterized in that: described upper and lower L-type spool, transmission shaft, upper valve rod is concentric.

3. top fills interlock three-way switch valve according to claim 1, it is characterized in that: have rotation groove above described twin-stage turbine operation mechanism, handwheel is rotated counterclockwise, and when an aligning left side is logical, closes, all-pass on the left of valve on the right side of valve; Handwheel turns clockwise, and aims at when the right side leads to and closes on the left of valve, all-pass on the right side of valve.

4. top fills interlock three-way switch valve according to claim 1, it is characterized in that: described upper three-way valve is assembled by upper valve body, bonnet, upper L-type spool, valve seat, seal ring, spring seat, upper valve rod, sealed pressing sleeve, transition seal plate and O RunddichtringO thereof, pad.

5. top fills interlock three-way switch valve according to claim 1, it is characterized in that: described lower three-way valve is assembled by lower valve body, bottom flange, lower L-type spool, valve seat, seal ring, spring, spring seat, transmission shaft, sealed pressing sleeve, bottom and O RunddichtringO thereof, spring bearing, pad.

6. top fills interlock three-way switch valve according to claim 1, it is characterized in that: upper three-way valve is provided with support, and described twin-stage turbine operation mechanism is connected on support.

7. top fills interlock three-way switch valve according to claim 4, and it is characterized in that: described upper valve body and transition seal plate weld together, described transition seal plate is connected with lower three-way valve by bolt and nut again.