CN104455489A - Disc valve linkage structure - Google Patents

Abstract

The invention discloses a butterfly valve connection structure, which comprises a valve cavity, a valve shaft placed in the valve cavity body, and a valve plate sleeved on the valve shaft. The two ends of the valve shaft extend out of the valve cavity body; the valve cavity One end of the main body is connected to the valve body, and the other end is connected to the valve seat; the valve shaft and the valve plate are connected without a key through an expansion device; the valve seat is a detachable valve seat. Aiming at problems such as the pin falling off that often occurs in the existing pin connection, or the leakage caused by poor connection, or even the shaft corrosion, the expansion device is used to replace the pin connection, and the disc plate and the shaft are fixed by a two-way expansion sleeve inside the disc plate, so that The effect of synchronous rotation of the shaft and the plate is achieved. The connection structure has the advantages of low processing and installation requirements, reliable connection, no leakage, overload protection, etc., and can effectively improve the reliability and durability of the butterfly valve.

Description

A disc valve connection structure

technical field

The invention relates to the connection of valves in fluid engineering, in particular to a butterfly valve connection structure.

Background technique

Butterfly valves are widely used in the transportation systems of various fluid media. Because of their precise flow control, they are widely used in coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting, power generation, environmental protection, building water supply and drainage and other engineering systems. It is used to regulate and cut off the flow of medium on pipelines conveying various corrosive and non-corrosive fluid media.

When the butterfly valve works, a disc-shaped valve plate is used to rotate around the valve shaft in the valve body, so as to achieve the purpose of opening and closing or adjustment. The rotation of the valve plate and the valve shaft is synchronous. The connection between the two is generally to drill through holes on the two parts and connect them through a tapered pin. The gap between the pin and the orifice plate is coated with waterproof glue. Its structural form is as follows: Shown in Figure 5 and 6.

Obviously, there are certain disadvantages in the structure of the above butterfly valve. Firstly, there are certain requirements for the cooperation between the pin and the hole during processing. If the cross section of one side is not round, it will cause a fit gap. Usually, waterproof glue is applied to the gap, but it will still cause the shaft end to be sealed. Not strict. Secondly, in the process of use, especially in large flow applications, the butterfly valve is accompanied by severe hydraulic impact, corrosion, and even cavitation, and the impact and erosion on the butterfly plate are also obvious. The above connection The structure is easy to cause the waterproof glue to fall off or dissolve, and then the corrosion and cavitation at the orifice plate will be aggravated, which will directly affect the service life of the butterfly valve.

If fluid comes into contact with the valve shaft, it can adversely affect both the valve shaft and the bearings. With the advancement of technology, the pinless structure is also gradually produced. The torque is transmitted by processing the mating surface of the valve shaft and the valve plate into a square or hexagon. This kind of valve is of great significance in demanding applications. However, this pinless connection also has certain disadvantages, the most important one is the high processing requirements, because the mating surface of the valve shaft and the valve plate bears the variable torque generated by the continuous hydraulic dynamic load, and the clearance of this kind of clearance is required to be extremely small At the same time, the axial positioning of this structure is often difficult to implement well. The pinless connection products of many domestic small butterfly valve manufacturers often have problems such as loose cooperation and shaft wear after working for a period of time. Therefore, the traditional connection structure between the two is not conducive to sealing and reliability in use.

In recent years, fluid machinery and pipeline control technology have continued to improve, and the requirements for high efficiency and reliability of valves are also increasing. The quality of traditional butterfly valve products is also in urgent need of improvement.

Contents of the invention

The object of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a disc valve coupling structure with compact structure, loosening resistance and wear resistance. The problem of unreliable connection between the valve plate and the valve shaft and loose sealing existing in the connection between the valve shaft and the valve plate in the prior art is effectively solved, and the risk of medium leakage is well avoided.

The present invention realizes through following technical scheme:

A butterfly valve connection structure, including a valve cavity body 11, a valve shaft 8 placed in the valve cavity body 11, a valve plate 2 set on the valve shaft 8, and the two ends of the valve shaft 8 protrude from the valve cavity body 11 External; one end of the valve cavity body 11 is connected to the valve body 1, and the other end is connected to the valve bottom 5;

The valve shaft 8 and the valve plate 2 are connected through an expansion device without a key; the valve bottom 5 is a detachable valve bottom.

The expansion device includes an outer sleeve 3-1 and an inner sleeve 3-2 placed therein, the inner wall of the outer sleeve 3-1 cooperates with the outer wall wedge structure of the inner sleeve 3-2, the outer sleeve 3-1 and the inner sleeve 3-2 Connected by bolt 3-3;

When the bolt 3-3 is tightened, the axis between the outer sleeve 3-1 and the inner sleeve 3-2 moves relatively, and the inner diameter of the inner sleeve 3-2 becomes smaller gradually. The sealing seat 9 corresponds to the axial position of the bolt 3-3 of the expansion device, and is provided with an assembly hole for disassembling/installing the bolt 3-3.

The expansion device is arranged on the valve shaft 8 near the end of the valve bottom 5 .

A tensioning device is also provided in the middle of the valve shaft 8 and/or at the end near the valve body 1 .

The two ends of the valve chamber body 11 are provided with sealing seats 9 .

A sealing ring 4 is arranged between the valve bottom 5 and the sealing seat 9 ; the sealing ring 4 is arranged in the ring groove of the sealing seat 9 .

Guide bearings 6 , 7 , 10 are provided between the end shaft of the valve shaft 8 and the valve bottom 5 , and between the valve shaft 8 and the valve body 1 .

Compared with the prior art, the present invention has the following advantages and effects:

The connection structure of the butterfly valve, through the cooperation of the wedge-shaped structure of the outer sleeve and the inner sleeve of the expansion device, adopts the principle of expansion, so that there is no relative slippage between the valve shaft and the valve plate, ensuring that the shaft surface will not be damaged, which overcomes the existing In the technology, there are disadvantages and deficiencies in opening holes on the valve shaft and the valve plate and fixedly connecting them through pins.

The valve plate and the valve shaft are connected by the expansion device, and the adjustment bolt can realize the above two tightening. The size of the expansion sleeve (inner sleeve, outer sleeve) needs to be reasonably selected according to the adjustment flow and pressure of the valve, and the installation size should also be considered.

The connection structure of the disc valve is easy to disassemble and install. If the disc valve needs to be maintained and repaired, it is only necessary to reverse the direction, remove the valve bottom, and use a screwdriver to unscrew the bolts on the jacket to remove the expansion device.

The technical means of the butterfly valve connection structure is simple and easy, which not only solves the problem of the connection between the valve plate and the valve shaft of the butterfly valve in the prior art, avoids the risk of medium leakage, but also is easy to maintain and maintain. Low, effectively improve the reliability and durability of butterfly valve work.

To sum up, the connection structure of this butterfly valve has high precision, easy installation, adjustment and disassembly; high strength, stable and reliable connection; it can protect the equipment from damage when overloaded, and is especially suitable for transferring heavy loads.

The butterfly valve connection structure can not only be used for fluid machinery and pump valve adjustment. And it can be widely used in heavy machinery, wind power generation, packaging machinery, printing machinery, numerical control machine tools, automation equipment and other fields.

Description of drawings

Fig. 1 is a schematic diagram of the connecting structure of the disc valve of the present invention.

Fig. 2 is a schematic diagram of the position and connection of the valve shaft, the expansion device and the valve plate in Fig. 1 .

Fig. 3 is a schematic diagram of the structure of the tensioning device in Fig. 1 .

Fig. 4 is a schematic diagram of the position where the tensioning device is installed in the middle of the valve shaft.

Fig. 5 is a schematic view of the front structure of the prior art.

Fig. 6 is a schematic cross-sectional structure diagram of Fig. 5 .

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments.

Example

As shown in Figures 1 to 4. A butterfly valve connection structure of the present invention includes a valve cavity body 11, a valve shaft 8 placed in the valve cavity body 11, a valve plate 2 set on the valve shaft 8, and the two ends of the valve shaft 8 extend out of the valve cavity Outside the body 11; one end of the valve cavity body 11 is connected to the valve body 1, and the other end is connected to the valve bottom 5;

The valve shaft 8 and the valve plate 2 are connected through an expansion device without a key; the valve bottom 5 is a detachable valve bottom.

The expansion device includes an outer sleeve 3-1 and an inner sleeve 3-2 placed therein, the inner wall of the outer sleeve 3-1 cooperates with the outer wall wedge structure of the inner sleeve 3-2, the outer sleeve 3-1 and the inner sleeve 3-2 Connected by bolt 3-3;

When the bolt 3-3 is tightened, the axis between the outer sleeve 3-1 and the inner sleeve 3-2 moves relatively, and the inner diameter of the inner sleeve 3-2 becomes smaller gradually. The sealing seat 9 corresponds to the axial position of the bolt 3-3 of the expansion device, and is provided with an assembly hole for disassembling/installing the bolt 3-3. The function of the assembly hole is that because the bolts 3-3 on the expansion device need to be tightened during assembly, two assembly holes need to be opened on the sealing seat 9 to facilitate the implementation of the fastening work. After the bolts are tightly connected, heat, seal and disassemble Fitting holes, and then install the valve bottom.

The expansion device is arranged on the valve shaft 8 near the end of the valve bottom 5 .

A tensioning device is also provided in the middle of the valve shaft 8 and/or at the end near the valve body 1 .

The two ends of the valve chamber body 11 are provided with sealing seats 9 .

A sealing ring 4 is arranged between the valve bottom 5 and the sealing seat 9 ; the sealing ring 4 is arranged in the ring groove of the sealing seat 9 .

Guide bearings 6 , 7 , 10 are provided between the end shaft of the valve shaft 8 and the valve bottom 5 , and between the valve shaft 8 and the valve body 1 .

As shown in Figure 1 and Figure 4, the expansion device can be optionally located in the middle and near the bottom of the valve. The specific installation position depends on the size of the valve in the actual application. It can be seen that the expansion device can be fixed in the middle of the valve plate, or can be fixed at the bottom 5 of the valve. In fact, for products with higher requirements, the expansion device can also choose multiple styles or use multiple expansion devices in series to achieve stable connection and overload protection.

The valve plate and the valve shaft are connected by the expansion device, and the adjustment bolt can realize the above two tightening. The size of the expansion sleeve (inner sleeve, outer sleeve) needs to be reasonably selected according to the adjustment flow and pressure of the valve, and the installation size should also be considered. For valves with large throttling flow rate or high pressure, you can choose to install an expansion sleeve with a long axial dimension in the middle of the valve plate, otherwise, install an expansion sleeve with a normal size near the bottom of the valve.

Considering that the wall thickness of the central sleeve of the original valve plate 2 is relatively small after the installation of the expansion device, in order to ensure the strength and reliability of the parts, the thickness of the central sleeve was slightly increased at the beginning of the design.

The connection structure of the butterfly valve adopts the expansion device to realize the keyless connection between the valve shaft 8 and the valve plate 2, between the inner sleeve 3-2 and the valve shaft 8, and the outer wall of the inner sleeve 3-2 and the outer wall 3-1. A huge clamping force is generated between the inner walls to realize the keyless connection between the valve shaft 8 and the valve plate 2, and its structural form is shown in FIG. 3 . When under load, torque, axial force or the combined load of the two is transmitted by the combination pressure of the expansion device, the valve shaft 8, and the valve plate 2 and the accompanying frictional force.

The connection structure of the disc valve has high precision, easy installation, adjustment and disassembly; high strength, stable and reliable connection; it can protect the equipment from damage when overloaded, and is especially suitable for transferring heavy loads.

The butterfly valve connection structure can not only be used for fluid machinery and pump valve adjustment. And it can be widely used in heavy machinery, wind power generation, packaging machinery, printing machinery, numerical control machine tools, automation equipment and other fields.

The assembly steps of the connecting structure of the disc valve: first put the expansion device into the center sleeve of the valve plate 2 at the position to be installed, and at the same time extend the valve shaft 8 connected with the bearing from the opening at the top of the valve bottom 5 to make the valve shaft 8 penetrate the center sleeve of the valve plate 2, and then fasten the bolts from the assembly hole of the sealing seat 9 at the end of the valve bottom. Install the valve bottom 5, the valve bottom 5 is connected to the valve 1 through the bottom thread, and the fastening nut 12 on the top of the valve body 1 can adjust the connection tightness between the valve bottom 5 and the valve body 1, the guide bearing 10 and the fastening The nut 12 also plays the role of axial positioning.

As described above, the present invention can be preferably carried out.

The implementation of the present invention is not limited by the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods, and are all included in within the protection scope of the present invention.

Claims (8)

1. a dish valve connecting structure, comprise valve pocket body (11), the valve shaft (8) be placed in valve pocket body (11), the valve plate (2) be sleeved on valve shaft (8), it is outside that valve pocket body (11) is stretched out in two ends of valve shaft (8); It is characterized in that: one end of valve pocket body (11) connects valve body (1), (5) at the bottom of the other end connection valve;

Realize being connected without key by swelling device between described valve shaft (8) with valve plate (2); (5) at the bottom of described valve are disassembly-type valve seat.

2. dish valve connecting structure according to claim 1, it is characterized in that: described swelling device comprises overcoat (3-1) and puts inner sleeve (3-2) in the inner, the inwall of overcoat (3-1) coordinates with the outer wall wedge-shaped structure of inner sleeve (3-2), is connected between overcoat (3-1) and inner sleeve (3-2) by bolt (3-3);

As tightening bolt (3-3), axis relative movement between overcoat (3-1) and inner sleeve (3-2), the internal diameter of inner sleeve (3-2) diminishes gradually.

3. dish valve connecting structure according to claim 1, is characterized in that: described swelling device arranges and closes on the valve shaft (8) of (5) this end at the bottom of valve.

4. dish valve connecting structure according to claim 3, is characterized in that: be also provided with swelling device at the middle part of described valve shaft (8) and/or the end of closing on valve body (1).

5. dish valve connecting structure according to any one of claim 1 to 4, is characterized in that: the two ends of described valve pocket body (11) are provided with sealing seat (9).

6. dish valve connecting structure according to claim 5, is characterized in that: (5) at the bottom of described valve and be provided with seal ring (4) between sealing seat (9); Seal ring (4) is arranged in the annular groove of sealing seat (9).

7. dish valve connecting structure according to claim 2, is characterized in that: described sealing seat (9), corresponding to bolt (3-3) axial location of swelling device, offers the pilot hole for tearing/filling bolt (3-3) open.

8. dish valve connecting structure according to claim 5, it is characterized in that: at the bottom of the end axle of described valve shaft (8) and valve between (5), and between valve shaft (8) and valve body (1), be provided with guide bearing (6,7,10).