CN114992352A

CN114992352A - Ball valve

Info

Publication number: CN114992352A
Application number: CN202210374545.3A
Authority: CN
Inventors: 严杰; 杨凌杰; 程锋
Original assignee: Anhui Tongdu Flow Technology Co ltd
Current assignee: Anhui Tongdu Flow Technology Co ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-09-02
Anticipated expiration: 2042-04-11
Also published as: CN114992352B

Abstract

The invention relates to a ball valve which comprises a ball valve chamber and an extension pipe, wherein the inner cavity of the extension pipe is communicated with the inner cavity of the ball valve chamber, a flange is arranged at the end part of the extension pipe, a circular metal plate is sleeved outside the extension pipe, a plurality of groups of knocking assemblies for knocking the ball valve chamber are arranged between the two metal plates, and an ultrasonic vibrator for driving the knocking assemblies is fixedly arranged on the outer side of each metal plate. The ball valve is additionally provided with the knocking component and is driven by the ultrasonic vibrator, so that when the ball valve is applied to air conveying equipment for powder, even if the powder during conveying is meshed into a sliding gap to cause difficulty in rotation switching operation of the ball valve, the knocking component is used for knocking at high frequency, the ball valve can be effectively prevented from being locked, and in the subsequent cleaning of the ball valve, the powder remained in the sliding gap is easy to clean, and the cleaning efficiency is high.

Description

Ball valve

Technical Field

The invention relates to a ball valve, and belongs to the technical field of valves.

Background

The ball valve, the opening and closing piece (ball) is driven by the valve rod and rotates around the axis of the ball valve. And can also be used for regulating and controlling the fluid.

The existing ball valve, especially the large ball valve, such as the nominal diameter of 300mm and above, has the following defects in the air conveying equipment for powder and granular bodies: when the seat ring in the ball valve chamber is displaced from the valve body, the powder or granule being conveyed leaks out from the gap generated between the seat ring and the valve body and is caught in a sliding gap or the like. Once the technical problems occur, the ball valve is easy to lock when serious, and the rotary switching operation cannot be carried out any more; and in the subsequent cleaning process, the residual powder and granular material at the sliding gap is not easy to clean.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a ball valve, which has the following specific technical scheme:

the utility model provides a ball valve, includes ball valve room, installs the extension pipe at ball valve room left and right sides both ends, the inner chamber of extension pipe and the inner chamber intercommunication of ball valve room, the flange is installed to the tip of extension pipe, the outside cover of extension pipe is equipped with the ring form metal sheet, is provided with the multiunit between two metal sheets and is used for knocking the subassembly that strikes of ball valve room, the outside fixed mounting of metal sheet has the ultrasonic vibrator who is used for driving the subassembly that strikes.

According to the further optimization of the technical scheme, the knocking component comprises a cross rod arranged between two metal plates and a knocking rod coplanar with the central axis of the ball valve chamber, the cross rod comprises a straight rod-shaped cross section, two ends of the cross section are respectively provided with an extension section with an arc-shaped cross section, the head end of the extension section is connected with the end part of the cross section into a whole, the length direction of the cross section is vertical to the length direction of the knocking rod, the tail end of the extension section is fixedly connected with the inner sides of the metal plates, and the tail ends of the extension sections correspond to the ultrasonic vibrators one by one and are arranged oppositely; the tail end of the knocking rod is fixedly connected with the middle part of the transverse section.

According to the further optimization of the technical scheme, the head end face of the knocking rod is matched with the outer side wall of the ball valve chamber.

According to the technical scheme, the annular cooling groove is further sleeved outside the extension pipe, the cooling groove is arranged between the metal plate and the flange, the cooling groove and the metal plate form a cooling chamber, all the ultrasonic vibrators are arranged in the cooling chamber, a water inlet pipe used for providing cold water and water for the cooling chamber is arranged at the lower part of the cooling chamber, and a water return pipe used for returning water is arranged at the upper part of the cooling chamber.

According to the further optimization of the technical scheme, the ultrasonic vibrators corresponding to the two ends of the cross rod vibrate synchronously.

According to the further optimization of the technical scheme, the ultrasonic vibrator performs intermittent vibration, and the working cycle of the ultrasonic vibrator is T; the vibration period of the ultrasonic vibrator is T in one working period of the ultrasonic vibrator ₁ The stop operation cycle of the ultrasonic transducer is T ₂ ，T＝T ₁ +T ₂ (ii) a In the vibration period of the ultrasonic vibrator, the knocking rod performs knocking operation on the outer wall of the ball valve chamber, the amplitude of the ultrasonic vibrator is A,

1≤k＜1.2；

3≤T ₁ /T ₂ ≤5。

according to the further optimization of the technical scheme, the frequency of the ultrasonic vibrator is 11-12 kHz.

The technical proposal is further optimized, and A is more than or equal to 115 mu m and less than 200 mu m.

According to the further optimization of the technical scheme, when the knocking rod stops knocking operation, the distance between the head end face of the knocking rod and the outer side wall of the ball valve chamber is smaller than or equal to 1.3 mm.

The ball valve is additionally provided with the knocking component and is driven by the ultrasonic vibrator, so that when the ball valve is applied to air conveying equipment of powder and granular bodies, even if the powder and granular bodies in conveying are meshed into a sliding gap to cause difficulty in rotation switching operation of the ball valve, the ball valve can be effectively prevented from being locked by knocking the knocking component at a high frequency, and the powder and granular bodies remained in the sliding gap are easy to clean when the ball valve is cleaned subsequently, so that the cleaning efficiency is high.

Drawings

FIG. 1 is a schematic structural view of the ball valve of the present invention;

FIG. 2 is a schematic view of the connection of the metal plates to the cross bar according to the present invention;

FIG. 3 is a graph showing the amplitude of an ultrasonic transducer and the vibration cycle of the ultrasonic transducer in example 4;

FIG. 4 is a graph showing the amplitude of an ultrasonic transducer and the vibration cycle of the ultrasonic transducer in example 5;

FIG. 5 shows d and A in example 7 _c Graph between values.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

As shown in fig. 1, the ball valve includes a ball valve chamber 10 and extension pipes 11 installed at left and right ends of the ball valve chamber 10, an inner cavity of each extension pipe 11 is communicated with an inner cavity of the ball valve chamber 10, a flange 12 is installed at an end of each extension pipe 11, an annular metal plate 21 is sleeved outside each extension pipe 11, a plurality of groups of knocking assemblies for knocking the ball valve chamber 10 are arranged between the two metal plates 21, and an ultrasonic vibrator 22 for driving the knocking assemblies is fixedly installed at an outer side of each metal plate 21.

The outer side of the metal plate 21 is the side close to the flange 12, and correspondingly, the inner side of the metal plate 21 is the side close to the ball valve chamber 10.

If the resistance of the powder particle body conveyed in the ball valve is increased when the powder particle body is bitten into the sliding gap during the rotary switching operation, the ultrasonic vibrator 22 drives the knocking component by starting the ultrasonic vibrator 22, so that the ball valve chamber 10 is knocked, and the powder particle body at the sliding gap in the ball valve chamber 10 can be vibrated out under the action of high-frequency knocking, so that the resistance during the rotary switching operation is reduced, and the locking phenomenon is avoided.

Meanwhile, if the powder particles remained at the sliding gap are easily cleaned due to the high-frequency vibration in the subsequent cleaning process.

Example 2

As shown in fig. 1, an annular cooling tank 23 is further sleeved outside the extension pipe 11, the cooling tank 23 is disposed between the metal plate 21 and the flange 12, the cooling tank 23 and the metal plate 21 form a cooling chamber 24, all the ultrasonic vibrators 22 are disposed in the cooling chamber 24, a water inlet pipe 25 for supplying cold water to the cooling chamber 24 is disposed at a lower portion of the cooling chamber 24, and a water return pipe 26 for returning water is disposed at an upper portion of the cooling chamber 24.

Because the ultrasonic vibrator 22 is easy to generate heat when vibrating, a water source can be externally connected through the water inlet pipe 25, and cooling water with the temperature of 20-25 ℃ enters the cooling chamber 24 from the water inlet pipe 25, exchanges heat with the ultrasonic vibrator 22 and is discharged from the water return pipe 26.

Example 3

As shown in fig. 1 and 2, the knocking component includes a cross bar 31 installed between two metal plates 21, and a knocking rod 32 coplanar with a central axis of the ball valve chamber 10, the central axis of the ball valve chamber 10 is a plane where the central axis of the ball valve chamber 10 is located, the central axis of the knocking rod 32 is coplanar with the central axis of the ball valve chamber 10, the cross bar 31 includes a straight rod-shaped cross section 311, two ends of the cross section 311 are respectively provided with an extension section 312 with an arc-shaped cross section, a head end of the extension section 312 is connected with an end of the cross section 311 into a whole, a length direction of the cross section 311 is perpendicular to a length direction of the knocking rod 32, a tail end of the extension section 312 is fixedly connected with an inner side of the metal plates 21, and tail ends of the extension sections 312 are in one-to-one correspondence with the ultrasonic vibrators 22 and are arranged in an opposite manner; the tail end of the knocking rod 32 is fixedly connected with the middle part of the transverse section 311.

First, the cross rod 31 is usually made of metal, such as cast iron, and when it is impacted by mechanical force at two ends for a long time, especially when two ends of the cross rod 31 are impacted simultaneously, the extension 312 has a circular arc structure, which is favorable for causing the cross rod 31 to bend and deform directionally, so that the knocking rod 32 is more easily subjected to the pressing force, and the knocking rod 32 is thereby caused to knock the ball valve chamber 10.

If extension 312 is not provided, but a single straight rod-like transverse section 311 is present, the striking rod 32 has a limited striking effect on the ball valve housing 10. The concrete expression is as follows:

the positive ultrasonic wave science and technology limited's of Zhejiang axe amplitude detector can be adopted and install in flange 12 department, its measurement accuracy: 2.5 percent; sensitivity: 1 um; maximum range: more than 1000 μm; measurable frequency range: 10 kHz-100 kHz.

In the present embodiment, when the frequency of the ultrasonic transducer 22 is 12kHz and the maximum amplitude of the ultrasonic transducer 22 is 163 μm, the maximum amplitude measured at the inner wall of the ball valve chamber 10 is 130 μm.

If the extension 312 is not provided, both ends of the horizontal portion 311 are fixedly connected to the metal plate 21, so that when the frequency of the ultrasonic vibrator 22 is 12kHz and the maximum amplitude of the ultrasonic vibrator 22 is 163 μm, the maximum amplitude measured at the inner wall of the ball valve chamber 10 is 87 μm.

If the ultrasonic vibrator 22 is directly installed on the side wall of the extension pipe 11, the gap between the vibration surface of the ultrasonic vibrator 22 and the side wall of the extension pipe 11 adopts a filling block with a filling corresponding shape and then is welded by full welding, and when the frequency of the ultrasonic vibrator 22 is 12kHz and the maximum amplitude of the ultrasonic vibrator 22 is 163 +/-5 mu m, the maximum amplitude measured on the inner wall of the ball valve chamber 10 is 68 mu m; when the cumulative oscillation time of the ultrasonic transducer 22 exceeds 100h, cracks are likely to occur in the oscillation surface of the ultrasonic transducer 22 and the welded portion.

In the embodiment, the metal plate 21 is arranged, the thickness of the metal plate 21 is 2 ± 0.2mm, and the metal plate 21 vibrates up and down along with the vibration of the ultrasonic vibrator 22, so that sufficient buffering is provided, cracks are not easy to appear on the connecting surface between the ultrasonic vibrator 22 and the metal plate 21, and no cracks are found when the accumulated vibration time exceeds 500 h.

If the extension pipe 11 is formed in a square pipe structure, powder is easily accumulated at the corners of the inner wall of the square pipe, and at the same time, the pipe thickness of the extension pipe 11 is generally over 5mm, which results in a maximum amplitude of 73 μm measured at the inner wall of the ball valve chamber 10 when the frequency of the ultrasonic vibrator 22 is 12kHz and the maximum amplitude of the ultrasonic vibrator 22 is 163. + -.5 μm.

Further, to ensure the knocking effect; the head end face of the knock rod 32 matches the outer side wall of the ball valve chamber 10.

Further, when the ultrasonic vibrators 22 corresponding to both ends of the cross bar 31 vibrate synchronously, the striking amplitude on the inner wall of the ball valve chamber 10 is the largest.

For example, when the ultrasonic transducers 22 corresponding to both ends of the crossbar 31 are vibrated in synchronization, the maximum amplitude measured at the inner wall of the ball valve chamber 10 is 130 μm. Under the same conditions, if the vibration is not performed synchronously, the maximum amplitude measured at the inner wall of the ball valve chamber 10 is only 98 μm.

Example 4

The ultrasonic vibrator 22 performs intermittent vibration, and the working cycle of the ultrasonic vibrator 22 is T; the vibration cycle of the ultrasonic transducer 22 is T within one operation cycle of the ultrasonic transducer 22 ₁ The ultrasonic transducer 22 has a stop operation cycle T ₂ ，T＝T ₁ +T ₂ (ii) a In the vibration cycle of the ultrasonic vibrator 22, the knocking lever 32 performs knocking operation on the outer wall of the ball valve chamber 10, the amplitude of the ultrasonic vibrator 22 is A, the unit of the amplitude is mum, and T ₁ 、T ₂ The unit of (a) is s,

as shown in figure 3 of the drawings,

k is more than or equal to 1 and less than 1.2, and k is preferably 1.1;

3≤T ₁ /T ₂ ≤5，T ₁ /T ₂ preferably 3;

wherein, A is more than or equal to 115 mu m and less than 200 mu m.

Ball valve cleaning test

Test step 1, preparation of ball valve sample

The valve seat ring was broken and allowed to deflect from the valve body until the clearance between the valve seat ring and the valve body was 2 mm. And continuously conveying marked powder particles (such as flour soaked by using an aqueous fluorescent tracer, wherein the aqueous fluorescent tracer can be selected from American Luoyang brand, and the flour, the water and the aqueous fluorescent tracer are mixed, dried and ground according to a ratio of 1000:500: 3) to the ball valve until the ball valve is locked and cannot be rotated and switched. The ball valve is disassembled, cleaned by clear water, a water pump is arranged at one flange 12, the other flange 12 is externally connected with a rubber pipe and a glass pipe, a fluorescent lamp (with the wavelength of 365nm) is arranged outside the glass pipe, and a water valve is arranged at the tail end of the glass pipe.

Test step 2, cleaning of ball valve sample

Pumping deionized water by a water pump, and flushing the ball valve sample for time t under the water pressure of 0.1MPa _cx After 30min, the water valve is closed, the ball valve chamber 10 is knocked by an iron hammer and the like, then the ball valve chamber is kept still for 10min, a fluorescent lamp is turned on for irradiation, and whether yellow green fluorescence exists at the position of the glass tube or not is observed.

Test step 3, calculation of Total time to Wash

If the glass tube has yellow-green fluorescence, repeating the test step 2, and the total washing time is t _zx ，t _zx ＝nt _cx And n is the number of times of repeating the test step 2.

Firstly, in this embodiment, since the ball valve is additionally provided with the knocking component, when the ball valve is subjected to the ball valve cleaning test, t _zx When the time is 2.5h, yellow green fluorescence can not be seen at the glass tube, which indicates that the glass tube is clean, namely, marked powder particles are not existed in the gap between the valve seat ring and the valve body.

If the existing ball valve is subjected to the ball valve cleaning test, t _zx At 24h, a yellow-green fluorescence was observed in the glass tube, indicating that the marked powder remains in the gap between the valve seat ring and the valve body.

If T is not set ₂ The ultrasonic transducer 22 is continuously vibrated, and the direct result is that the maximum amplitude measured at the inner wall of the ball valve chamber 10 is reduced from 130 μm to 107 μm after 2 hours of continuous vibration.

In addition, T is changed ₁ /T ₂ When value of (1) is due to T ₁ Stationary, T ₂ Changing accordingly; with T ₁ /T ₂ The increase in the number of the first and second,T ₂ then the number is reduced; t is mT, m is a positive integer, and when t is more than or equal to 2h, the maximum amplitude measured at the inner wall of the ball valve chamber 10 is A _2h The results are shown in Table 1:

TABLE 1

T ₁ /T ₂	1	1.5	2	2.5	3	3.5	4	4.5	5	5.5	6
												A _2h	131	130	129	127	129	126	122	123	121	105	93

As can be seen from Table 1, T ₁ /T ₂ ≤5，A _2h Neither change was large (not more than 10 μm). But if T ₂ Too large means that the ultrasonic transducer 22 is stopped for too long, which is not favorable for shortening the total time t and improving the working efficiency. Thus, T ₁ /T ₂ Preferably 3.

When the k value is changed, the amplitude change trend of the ultrasonic vibrator 22 is obviously changed, the knocking effect of the knocking component on the ball valve chamber 10 is also influenced, and meanwhile, the maximum amplitude measured at the inner wall of the ball valve chamber 10 in real time is A ₀ The results are shown in Table 2:

TABLE 2

k	0.9	1	1.1	1.15	1.2	1.3
							A ₀	113	122	130	126	118	105

As the k value increases, the better the knocking assembly knocks the ball valve chamber 10; however, if the value of k is too large, it is necessary to define 115 μm.ltoreq.A < 200 μm, which results in a very small initial value of A and also affects the knocking effect of the knocking assembly on ball valve housing 10.

Example 5

as shown in figure 4 of the drawings,

K＝1.1，T ₁ /T ₂ ＝3；115μm≤A＜200μm。

in this embodiment, when the ball valve is subjected to the ball valve cleaning test, t _zx No yellow-green fluorescence was visible at the glass tube indicating a clean wash. The ultrasonic transducer 22 of the present embodiment is shorter in time (T) than in embodiment 4 ₁ ) Is less severe, which directly results in the knocking rod 32 having less effect on the outer wall of the ball valve chamber 10 than in embodiment 4.

Example 6

Generally, the frequency of the ultrasonic vibration is usually 10kHz to 60 kHz. In the invention, the frequency of the ultrasonic vibrator 22 is 11-12 kHz, and the service life of the metal plate 21 is easily influenced obviously due to overhigh frequency; research shows that the maximum amplitude of the inner wall of the ball valve chamber 10 is influenced by the fast vibration of the ultrasonic vibrator 22; for example, if the frequency of the ultrasonic transducer 22 is 60kHz and the maximum amplitude of the ultrasonic transducer 22 is 163. + -.5 μm, the maximum amplitude measured at the inner wall of the ball valve chamber 10 is 108 μm.

Example 7

The distance between the head end face of the knocking rod 32 and the outer side wall of the ball valve chamber 10 is d, and d is smaller than or equal to 1.3 mm.

d, measuring by using a space image measuring instrument, wherein the precision is 0.05 mm. A screw rod and a matched nut can be vertically arranged outside the transverse section 311, the nut is fixed, the transverse section 311 is pushed by rotating the screw rod, and the value d is finally changed; the control precision of the screw rod and the screw nut is up to 0.05mm by controlling the screw pitch of the screw rod and the screw nut.

In the present embodiment, when the frequency of the ultrasonic transducer 22 is 12kHz and the maximum amplitude of the ultrasonic transducer 22 is 163 μm, the maximum amplitude measured at the inner wall of the ball valve chamber 10 is A _c ，

Changing the value of d, measuring the corresponding A _c Values, results are shown in table 3 and fig. 5:

TABLE 3

As can be seen from table 3 and fig. 5: when d is less than or equal to 1.3mm, A _c Can get the maximum; since d is too small, A _c Instead, the maximum cannot be reached, while the d value is too small, the more difficult it is to maintain that value at all times; theoretically, when d is more than or equal to 1.1 and less than or equal to 1.3mm, A _c Optimizing; but do notAfter long-term use, the value of d is in a wide range, so that the application requirement can be met only by controlling d to be less than or equal to 1.3 mm.

In the above embodiment, the ball valve is additionally provided with the knocking component and is driven by the ultrasonic vibrator, so that even if the rotation switching operation of the ball valve is difficult due to the fact that the powder/granular material during conveying is meshed into the sliding gap when the ball valve is applied to the air conveying equipment of the powder/granular material, the ball valve can be effectively prevented from being locked by knocking the knocking component at a high frequency, and the powder/granular material remained in the sliding gap is easy to clean when the ball valve is cleaned subsequently, so that the cleaning efficiency is high.

It should be noted that, in the ball valve cleaning test, if the cleaning is convenient, the high-frequency knocking can promote the powder particles at the sliding gap to be knocked and vibrated out of the sliding gap, so that the knocking component can be used for knocking at high frequency, and the resistance of the ball valve during rotation switching operation can be effectively reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A ball valve comprises a ball valve chamber (10) and extension pipes (11) arranged at the left end and the right end of the ball valve chamber (10), wherein the inner cavities of the extension pipes (11) are communicated with the inner cavity of the ball valve chamber (10), and flanges (12) are arranged at the end parts of the extension pipes (11), and the ball valve is characterized in that: the ball valve box is characterized in that a circular metal plate (21) is sleeved outside the extension pipe (11), a plurality of groups of knocking assemblies used for knocking the ball valve box (10) are arranged between the two metal plates (21), and an ultrasonic vibrator (22) used for driving the knocking assemblies is fixedly mounted on the outer side of each metal plate (21).

2. A ball valve according to claim 1, wherein: the knocking component comprises a cross rod (31) arranged between two metal plates (21) and a knocking rod (32) coplanar with the middle shaft surface of the ball valve chamber (10), the cross rod (31) comprises a straight rod-shaped cross section (311), two ends of the cross section (311) are respectively provided with an extension section (312) with an arc-shaped cross section, the head end of the extension section (312) is connected with the end part of the cross section (311) into a whole, the length direction of the cross section (311) is vertical to the length direction of the knocking rod (32), the tail end of the extension section (312) is fixedly connected with the inner side of the metal plates (21), and the tail ends of the extension sections (312) are in one-to-one correspondence with the ultrasonic vibrators (22) and are arranged oppositely; the tail end of the knocking rod (32) is fixedly connected with the middle part of the transverse section (311).

3. A ball valve according to claim 2, wherein: the head end surface of the knocking rod (32) is matched with the outer side wall of the ball valve chamber (10).

4. A ball valve according to claim 1, wherein: the outside of extension pipe (11) still overlaps and is equipped with ring form cooling trough (23), cooling trough (23) set up between metal sheet (21) and flange (12), cooling trough (23) and metal sheet (21) constitute cooling chamber (24), and all ultrasonic vibrator (22) all set up in cooling chamber (24), the lower part of cooling chamber (24) is provided with inlet tube (25) that are used for providing cold water intaking to cooling chamber (24), the upper portion of cooling chamber (24) is provided with return water pipe (26) that are used for the return water.

5. A ball valve according to claim 3, wherein: the ultrasonic vibrators (22) corresponding to the two ends of the cross rod (31) vibrate synchronously.

6. A ball valve according to claim 5, wherein: the ultrasonic vibrator (22) performs intermittent vibration, and the working cycle of the ultrasonic vibrator (22) is T; the vibration period of the ultrasonic vibrator (22) is T within one working period of the ultrasonic vibrator (22) ₁ The stop operation cycle of the ultrasonic vibrator (22) is T ₂ ，T＝T ₁ +T ₂ (ii) a In the vibration period of the ultrasonic vibrator (22), the knocking rod (32) performs knocking operation on the outer wall of the ball valve chamber (10), the amplitude of the ultrasonic vibrator (22) is A,

1≤k＜1.2；

3≤T ₁ /T ₂ ≤5。

7. a ball valve according to claim 6, wherein: the frequency of the ultrasonic vibrator (22) is 11-12 kHz.

8. A ball valve according to claim 6, wherein: a is more than or equal to 115 mu m and less than 200 mu m.

9. A ball valve according to claim 2, wherein: when the knocking rod (32) stops knocking operation, the distance between the head end surface of the knocking rod (32) and the outer side wall of the ball valve chamber (10) is smaller than or equal to 1.3 mm.