CN105697793B - A kind of spool method for dismounting of valve - Google Patents

Abstract

The invention relates to a valve and a method for disassembling the valve core. The disassembly method includes the following steps: a. Rotate the handwheel to close the valve, move the screw downward so that the wrench part is at the bottom, and the wrench notch extends from the inlet and cooperates with the wrench part; b. Put the handwheel into the In the rotating tool with a larger force arm, hold the wrench to control the wrenching part to not rotate, and continue to rotate the hand wheel in the opposite direction, the screw rod is still and does not rotate, so that the valve stem is unscrewed from the screw rod; The screw moves upwards so that there is a distance between the plug and the valve port for removing the plug, and then use a wrench to pull down the plug and take it out from the inlet; d. Finally, use a wrench to turn the wrenching part in the opposite direction of step c to promote The screw rod moves downward until the lower end of the screw rod stretches into the valve port and breaks away from the water flow plate, and the valve core is pulled out. The valve is a valve with low cost and good sealing and anti-leakage effects. When using the valve, it is very convenient to replace the valve core.

Description

A method for removing a spool of a valve

This application is a divisional application for an invention patent application with an application date of November 27, 2014, an application number of 201410706957.8, and an invention titled "a valve and its valve core disassembly method".

technical field

The invention belongs to the field of mechanical accessories, and in particular relates to a valve and a method for disassembling the valve core.

Background technique

An existing valve, as shown in Figure 1, has a structure comprising a valve body 10, a handwheel 50, a valve stem 30 and a valve core 20, the valve body 10 is provided with an inlet and an outlet, and the handwheel 50 is outside the valve body. The spool 20 is in the valve body, the top of the valve body 10 is a bonnet 40, the bonnet 40 is fixedly installed on the spool port of the valve body 10 by screws, the valve hole in the middle of the bonnet 40, the inner wall of the valve hole is provided with threads, and the valve stem 30 is provided with an external thread that matches the internal thread of the valve hole. The upper end of the valve stem 30 is fixedly connected with the handwheel 50. The middle part of the valve stem 30 is threadedly connected with the valve hole in the middle part of the valve cover 40. Through the adjustment of the handwheel 50, the valve core is realized. 20 moves up and down. The above-mentioned valve fixes the bonnet 40 on the spool port of the valve body 10 by screws instead of integrally casting it. The advantage is that it is more convenient to disassemble and replace the spool.

Although the above-mentioned valve is simple in structure and low in cost, we found that this kind of valve still has many deficiencies during use, mainly in the following two points: 1. The bonnet 40 of the valve and the valve body 10 are connected by a split connection, If pig iron with low cost is used, it is not only easy to rust and leak at the joint, but also has low strength. 2. The middle part of the valve stem 30 and the valve hole in the middle part of the bonnet 40 are threaded. The purpose of the threaded connection is to drive the hand wheel to move up and down with the valve hole, so it is a movable loose fit. And this kind of cooperation also needs to realize sealing, which not only requires very high precision, but also wears and leaks very easily after a period of use. In addition, this kind of matching method is prone to leakage when the water pressure is high, which is difficult to meet the high water pressure environment.

Contents of the invention

In view of the shortcomings of the above-mentioned valves, the technical problem to be solved by the present invention is to provide a valve with low cost, good sealing and leak-proof effect and easy replacement of the valve core.

On the basis of the valve, another technical problem to be solved by the present invention is to provide a method for disassembling the valve core in the valve.

For this reason, the present invention adopts following technical scheme:

A method for removing the valve core of the above-mentioned valve. The valve includes a valve body, a hand wheel, a valve stem and a valve core. A cavity is provided in the valve body, and an inlet and an outlet connected to the cavity are provided on the valve body. The wheel is outside the valve body, the valve core is inside the valve body, and the hand wheel is connected to the valve core through the valve stem; The through hole through which the valve stem is pierced; a sealing ring is provided in the through hole; the cavity in the valve body is divided into an upper cavity connected with the inlet and a lower cavity connected with the outlet, and the valve body between the bottom of the upper cavity and the lower cavity A valve port that can be connected is provided on the wall; the valve core includes a screw rod and a plug for blocking the valve port; the valve rod is a polished rod, and the lower part of the valve rod passes through the through hole and extends into the upper chamber; The inner side of the upper end of the screw is provided with a threaded hole, the lower end of the valve stem is provided with an external thread that matches the threaded hole, and a first thread fit connection is formed between the lower end of the valve stem and the upper end of the screw; the inner side of the upper chamber is provided with a belt A water-passing plate with an internally threaded hole; a second threaded connection is formed between the screw and the internally threaded hole; the second threaded connection is a loose fit that can drive the screw to move up and down with the water-passing plate, and the first thread The mating connection is a fixed connection that is tighter than the second threaded mating connection; the lower part of the screw rod is provided with a wrenching part with a polygonal cross-section. When the valve is closed, the position of the wrenching part corresponds to the inlet; The screw rod is detachably connected with the plug, and the plug corresponds to and matches with the valve port. The disassembly method adopts a wrench with a notch matched with the wrench; it includes the following steps:

a. Rotate the handwheel to close the valve, and the screw moves downward so that the wrench part is at the bottom, and the wrench notch extends from the inlet and cooperates with the wrench part;

b. Put the hand wheel into the rotating tool with increased force arm, hold the wrench to control the wrenching part not to rotate, and continue to rotate the hand wheel in the opposite direction, the screw is still and does not rotate, so that the valve stem can be unscrewed from the screw;

c. Then use a wrench to turn the wrenching part to promote the upward movement of the screw, so that there is a gap between the plug and the valve port for removing the plug, and then use a wrench to remove the plug and take it out from the inlet;

d. Finally, use a wrench to turn the wrenching part in the opposite direction of step c, so that the screw rod moves downward until the lower end of the screw rod extends into the valve port and breaks away from the water passage plate, and removes the valve core.

As a further improvement of the present invention, in the valve, the inner wall of the through hole is provided with two annular grooves arranged up and down, and the number of the sealing rings is two, which are respectively accommodated in the two annular grooves.

As a further preferred solution of the present invention, in the valve, the plug has a conical structure with a large top and a small bottom, a protrusion is provided on the top surface of the plug, and a mounting bracket is provided on the lower end surface of the screw rod. groove, and the protrusion is embedded into the installation groove and fixed.

Furthermore, in the valve, the protrusion is a clip, the installation groove is a slot, and the plug is snapped into the slot at the lower end of the screw through the clip.

The use of the invention can achieve the following beneficial effects: the valve of the present invention is still low in cost, and the valve with this structure has a valve cover top wall connected with the valve body body as a whole. The through hole of the valve body. A sealing ring is arranged in the through hole; the valve stem is a polished rod, the lower part of the valve stem passes through the through hole, and the polished rod and the sealing ring are closely matched, which is convenient for rotation and has a good sealing effect. Specifically, it is a screw rod connected to the valve rod that is driven by the hand wheel and moves up and down with the axial direction to promote the conduction and closure between the plug and the valve port, and the screw rod is completely in the upper chamber. In this way, the internal threaded hole between the screw rod and the water-passing plate can adopt an extremely loose fitting relationship, which reduces the turning force of the hand wheel and facilitates the operation of the valve. Therefore, the valve can also be applied to the environment of higher pressure, and the operation of the valve is flexible, and it is not easy to become a dead valve if it does not rotate for a long time.

Description of drawings

Figure 1: Schematic diagram of the cross-sectional structure of the prior art.

Fig. 2: Schematic diagram of the cross-sectional structure of the embodiment of the present invention.

Figure 3: Schematic diagram of the cooperative structure of the wrench and the wrenching part when the valve core is disassembled in the present invention.

Figure 4: Schematic diagram of the decomposed structure of the valve core when the valve core is disassembled in the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment: A kind of valve as shown in Fig. 2～4, comprises valve body 1, handwheel 3, valve rod 20 and valve core, is provided with cavity in valve body 1, is provided with described cavity on valve body 1 The inlet 10 and the outlet 11 connected by the cavity, the hand wheel 3 is outside the valve body 1 , the valve core is inside the valve body 1 , and the hand wheel 3 is connected to the valve core through the valve stem 20 . specifically:

The cavity in the valve body 1 is divided into an upper chamber 1c connected to the inlet 10 and a lower chamber 1d connected to the outlet, and a valve port 1e is provided on the inner wall of the valve between the bottom of the upper chamber 1c and the lower chamber 1d. , Block the valve port 1e, that is, the valve is closed. The top of the valve body 1 is the top wall of the bonnet which is integrated with the main body of the valve body 1. The top wall of the bonnet is provided with a through hole 10a for piercing the valve stem 20; the inner wall of the through hole 10a is provided with two annular grooves arranged up and down. Each annular groove is provided with a sealing ring 4, that is, two sealing rings 4 are arranged up and down, and are respectively accommodated in the two annular grooves. The valve rod 20 is a polished rod, and its lower part extends into the upper chamber 1c through the through hole 10a, and the valve rod 20 in the through hole 10a squeezes the sealing ring 4 to realize sealing.

The inner side of the upper chamber 1c is provided with a water-passing plate 1b, and the peripheral side of the water-passing plate 1b is fixedly connected to the inner wall of the upper chamber 1c. The middle part of the water-passing plate 1b has internal thread holes, and several water ports are arranged around the middle. The position of the internally threaded hole is directly above the valve port 1e. The valve core includes a screw rod 21 and a plug 22 for blocking the valve port 1e. The lower end of the screw rod 21 is connected to the plug 22, so the plug 22 corresponds to the valve port 1e, and the plug 22 is large at the top and small at the bottom. Conical structure, the lower end matches the shape of the valve port 1e.

The above-mentioned screw rod 21 is threadedly connected with the internally threaded hole, specifically loosely fitted with the movable one. The inner side of the upper end of the screw rod 21 is provided with a threaded hole, and the lower end of the valve stem 20 is provided with an external thread matched with the threaded hole. A first thread fit connection is formed with the upper end of the screw rod 21; a water passage plate 1b with an internal thread hole is provided inside the upper chamber 1c; a second thread fit connection is formed between the screw rod 21 and the internal thread hole.

The second threaded connection is a loose fit that can drive the screw rod 21 to move up and down with the water passage plate 1b, and the first threaded connection is a fixed connection that is tighter than the second threaded connection.

The lower part of the screw 21 is provided with a wrenching part 211 with a polygonal cross section. When the valve is closed, the position of the wrenching part 211 corresponds to the inlet 10; The plug 22 corresponds to and matches the valve port 1e.

The above-mentioned plug 22 has a conical structure with a large top and a small bottom. The top surface of the plug 22 is provided with a protrusion, and the lower end surface of the screw 21 is provided with a mounting groove, and the protrusion is embedded into the fixed in the mounting slot described above. The protrusion is a clip, the mounting groove is a slot, and the plug 22 is snapped into the slot at the lower end of the screw rod 21 through the clip.

The reason why the present invention uses the top of the valve body 1 as the top wall of the bonnet that is integrated with the body of the valve body 1 is that the valve body has integrity, brings better compressive strength, and is not easy to be damaged by seams. Rust and leak, so that the manufacturer can use low-cost cast iron material to make the valve body, which also has the effect of reducing costs.

After adopting the valve body 1 with the above-mentioned one-piece structure, in order to replace the valve core, the present invention can disassemble the valve core in the following manner. specifically:

The disassembly method of the spool in the above-mentioned valve structure requires a relatively conventional disassembly tool, which is a wrench 5 with a notch matching the wrench part 211; the disassembly method includes the following steps:

1. Rotate the hand wheel 3 to close the valve, the screw rod 21 moves downward so that the wrenching part 211 is at the bottom, and the notch of the wrench 5 extends from the inlet 10 and cooperates with the wrenching part 211;

2. Put the handwheel 3 into the rotating tool with a larger force arm, hold the wrench 5 to control the wrenching part not to rotate, continue to rotate the handwheel 3 in the opposite direction, the screw 21 is still and does not rotate, so that the valve stem 20 is unscrewed out of the screw 21;

3. Use the wrench 5 to turn the wrenching part 211 to make the screw 21 move upwards, so that there is a distance between the plug 22 and the valve port 1e for removing the plug 22, and then use the wrench 5 to remove the plug 22 and remove it from the inlet. 10 take out;

4. Finally, use the wrench 5 to turn the wrenching part 211 in the opposite direction in step c, so as to force the screw 21 to move downward until the lower end of the screw 21 extends into the valve port 1e and breaks away from the water passage plate 1b, and removes the valve core.

The disassembly method of the spool is relatively ingenious. The inlet 10 is used as the disassembly port, and the wrench 5 is used to rotate with the hand wheel 3. After the above steps, the spool can be removed smoothly. Of course, the above-mentioned inlet 10, screw rod 21, and valve port 1e The size and the size of the plug 22 are arbitrary designs based on those skilled in the art being able to implement the above method. By adopting the method for disassembling the spool, the leak-prone design in the prior art can be effectively avoided, and at the same time, the advantage of convenient replacement of the spool can be retained. Moreover, this disassembly method is relatively concealed, suitable for professionals to disassemble and assemble, and is convenient for the factory to prevent users from disassembling at will, so that the follow-up maintenance of the valve belongs to the factory's maintenance and maintenance, and has unity.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. a kind of spool method for dismounting of valve, the valve includes valve body (1), handwheel (3), valve rod (20) and spool, and valve body (1) is interior Equipped with cavity, valve body (1) is equipped with the import (10) connected with the cavity and outlet (11), handwheel (3) are in valve body (1) Outside, spool is in valve body (1), and handwheel (3) connects spool by valve rod (20)；

It is the valve deck roof being connected as a single entity with valve body (1) ontology at the top of the valve body (1), the valve deck roof is equipped with to wear If the through-hole (10a) of valve rod (20)；Sealing ring (4) is equipped in through-hole (10a)；Cavity in the valve body (1) is divided into and import (10) epicoele (1c) of connection and the cavity of resorption (1d) of outlet connection, the valve body (1) between epicoele (1c) bottom and cavity of resorption (1d) are interior Wall is equipped with connectable logical valve port (1e)；

The spool includes screw rod (21) and for blocking the plug of valve port (1e) (22)；

The valve rod (20) is polished rod, and valve rod (20) lower part passes through the through-hole (10a) and stretches into epicoele (1c)；

Threaded hole is equipped on the inside of screw rod (21) upper end, valve rod (20) lower end is equipped with the external screw thread coordinated with the threaded hole, The first thread fitting is formed between valve rod (20) lower end and screw rod (21) upper end to connect；

The water board (1b) with internal thread hole is equipped on the inside of the epicoele (1c)；Between the screw rod (21) and the internal thread hole Form the connection of the second thread fitting；

The second thread fitting connection is can to drive screw rod (21) with the up and down loose fit of water board (1b), the first screw thread Mating connection is tightly to be fixedly connected in what the second thread fitting connected；

Screw rod (21) lower part is equipped with the pulling part (211) that section is in polygon, when closing valve, pulling part (211) position Put the corresponding import (10)；Screw rod (21) and plug (22) below the pulling part (211) is detachably connected and described Plug (22) is corresponding with valve port (1e) and matches；It is characterized in that：The method for dismounting carries and the pulling part using one (211) spanner (5) of matched recess；It includes the following steps：

A. rotation hand wheel (3) closes valve, and screw rod (21) activity downwards causes pulling part (211) in bottom, the spanner (5) recess is stretched into from import (10) and is coordinated with pulling part (211)；

B. handwheel (3) is fitted into the turning tool for increasing the arm of force, holds spanner (5) and pulling part is controlled not rotate, continued reversed Rotation hand wheel (3), screw rod (21) is static not to be rotated so that valve rod (20) screws out screw rod (21)；

C. the screw rod (21) activity upwards is promoted so that plug (22) and valve using spanner (5) rotation pulling part (211) again Between mouth (1e) there is the spacing of dismounting plug (22), then dial lower end cap (22) with spanner (5) and taken out at import (10)；

D. it is last that spanner (5) is used to promote the screw rod (21) downward with direction rotation pulling part (211) opposite in step c Activity until screw rod (21) lower end stretches into valve port (1e) and is detached from water board (1b), then splits out screw rod (21).

2. a kind of spool method for dismounting of valve according to claim 1, it is characterised in that：In the valve, in through-hole (10a) Wall is equipped with two annular grooves being arranged above and below, and sealing ring (4) quantity is two, is respectively received in two annular grooves It is interior.

3. a kind of spool method for dismounting of valve according to claim 1, it is characterised in that：In the valve, the plug (22) in the cone structure that top is big, bottom end is small, the top surface of plug (22) is equipped with protrusion, on the lower face of the screw rod (21) Equipped with mounting groove, the protrusion is embedded in the mounting groove fixed.

4. a kind of spool method for dismounting of valve according to claim 3, it is characterised in that：In the valve, the protrusion is Fastener, the mounting groove are card slot, and plug (22) is clamped by fastener and the card slot of the lower end of screw rod (21).