CN103234057B - A kind of Novel high-pressure micro-torque ball valve - Google Patents

Abstract

The invention discloses a new micro-torque ball valve under high pressure, which mainly includes a valve stem, a connecting body, a ball, a valve seat and a valve seat push-out mechanism. The valve seat push-out mechanism includes a valve seat push-out mechanism under pressure and a Valve seat push-out mechanism; when under pressure, the valve seat push-out mechanism includes a transmission plate connected to the valve stem, a push rod, an independent check valve, a downstream oil passage, a pressure storage cavity and an upstream oil passage, and the check valve is installed in the connecting body , the pressure storage chamber communicates with the downstream of the one-way valve through the downstream oil passage, and the upstream of the one-way valve communicates with the upstream of the pipeline through the upstream oil passage; the pressure storage chamber is surrounded by the valve seat, the pressure storage chamber pressure plate and the connecting body, The pressure plate of the pressure storage chamber is connected with a fixed plate, and the ejector rod is installed on the pressure plate of the pressure storage chamber and the fixed plate; the ejector rod positioning block is installed on the ball, and the ejector rod positioning block is provided with a positioning groove, and the end of the ejector rod is provided with a Locate the bump. The invention has long service life, good sealing effect, and less wear on the spherical surface and the valve seat.

Description

A New Micro Torque Ball Valve at High Pressure

technical field

The invention relates to a ball valve, in particular to a novel high-pressure micro-torque ball valve.

Background technique

In the Chinese patent application publication specification CN100356096C, the inventor discloses a torque-free ball valve at high pressure. The ball valve includes a valve body, a connecting body, a sphere, a valve stem and a valve seat. The chamber is connected with the oil control device. The oil control device includes the ejector sleeve, the ejector rod inside the ejector sleeve, the one-way valve, the oil inlet passage and the oil outlet passage arranged in the connecting body, and the valve seat oil passage arranged in the valve seat. ;The front part of the ejector sleeve is located in the connecting body, and the tail of the ejector sleeve is located in the valve body; the one-way valve is on the top of the ejector rod; one end of the oil outlet is connected to the oil storage chamber, and the other end is connected to the oil inlet through the one-way valve ;The oil inlet passage is connected with the oil passage of the valve seat, and the side of the valve stem is provided with a conical dimple, and the tail end of the ejector rod sleeve is pushed into the conical dimple; as the ejector rod sleeve moves outward, it is located at the The inner ejector rod also pushes against the valve stem and moves outward, thereby pushing the one-way valve to open, and the high-pressure oil in the oil storage chamber pushes the valve seat to move in the opposite direction, so that the valve seat is separated from the ball.

The disadvantages of this kind of ball valve are: first, the one-way valve and the connecting body are integrally processed, that is, the valve body of the one-way valve borrows the structure of the connecting body, which is not only troublesome for processing and maintenance, but also once the one-way valve is damaged, the entire connecting body All are scrapped, and the cost is too high; second, when the reverse closing is performed, the pressure in the oil storage chamber cannot be completely released, which may easily cause incomplete closing; third, when the ball valve is opened without pressure upstream, due to the contact between the spherical surface and the seat surface, it is easy to cause wear and tear.

Contents of the invention

The purpose of the present invention is to provide a novel high-pressure micro-torque ball valve.

The present invention solves the problem that the integrated structure of the check valve and the connecting body in the existing non-torque ball valve leads to troublesome processing and high maintenance costs, and the pressure of the oil storage chamber in the non-torque ball valve cannot be completely released and opens when there is no pressure. Valve seat sealing surface wear and other problems.

The technical solution adopted by the present invention to solve the technical problem is: the present invention mainly includes a valve stem, a connecting body, a ball, a valve seat and a valve seat push-out mechanism, and is characterized in that the valve seat push-out mechanism includes a valve seat push-out mechanism under pressure. And when there is no pressure, the valve seat pushes out the mechanism;

The valve seat push-out mechanism under pressure includes a transmission plate connected to the valve stem, a push rod, an independent one-way valve, a downstream oil passage, a pressure storage cavity and an upstream oil passage. The one-way valve is installed in the connecting body, and the storage The pressure chamber communicates with the downstream of the one-way valve through the downstream oil passage, and the upstream of the one-way valve communicates with the upstream of the pipeline through the upstream oil passage;

The pressure storage cavity is surrounded by the valve seat, the pressure storage cavity pressure plate and the connecting body, the pressure storage cavity pressure plate is connected with a fixed plate, and the ejector rod is installed on the pressure storage cavity pressure plate and the fixed plate;

There is a groove on the transmission plate, and a top surface at the tail end of the ejector rod. The groove of the transmission plate matches the top surface of the ejector rod. The front end of the ejector rod rests on the downstream end of the one-way valve. When the top surface of the tail end of the ejector rod falls into the groove of the transmission plate, the one-way valve is closed, and when the top surface of the tail end of the ejector rod breaks away from the groove of the transmission plate, that is, when it is ejected, the one-way valve opens;

The ejector rod positioning block is installed on the ball, and the ejector rod positioning block is provided with a positioning groove. The end of the ejector rod is provided with a positioning protrusion. The positioning groove matches the positioning protrusion. When the positioning protrusion at the end of the ejector rod falls into the positioning When the positioning groove of the block is inserted, the top surface of the tail end of the ejector rod also falls in the groove of the transmission plate, the spool of the check valve is pushed back by the valve spring, and the check valve is closed.

When the ball valve is to be opened and the valve stem is rotated, the ejector rod is ejected from the groove of the transmission plate first, and the check valve is opened, the valve seat is separated from the ball, and then the valve stem is rotated to drive the ball to open the valve;

When the ball valve is to be closed, turn the valve stem in the opposite direction to the closed position, the valve stem positioning block engages with the positioning structure at the end of the ejector rod, the check valve is pressed back by the valve spring, the check valve is closed, and the ball valve is sealed by the valve seat.

The beneficial effects of the present invention are: one, the independent structure of the one-way valve, the one-way valve of the present invention is an independent structure, the spool of the one-way valve is arranged in the valve body, and the valve body is installed in the one-way valve mounting hole of the connecting body, Realize the separation structure of the one-way valve and the connecting body. This single and independent one-way valve is not only convenient to process, but also convenient to install and maintain, which greatly improves the service life of the ball valve. The second is to make the ball valve fully closed and sealed. Since the pressure storage cavity of the present invention is provided with a micro pressure relief channel, when the check valve is closed, the pressure in the pressure storage cavity can still pass through the micro pressure relief channel, so that the ball valve is completely closed and sealed. The third is that when the ball valve is opened without pressure upstream, the valve seat and the ball are in a disengaged state, and the spherical surface and the valve seat surface have no contact, which effectively protects the spherical surface and the valve seat surface.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 .

Figure 3 is a combined view of the valve seat and the ball.

FIG. 4 is a top view of FIG. 3 .

Fig. 5 is a structural schematic diagram of the transmission plate.

Fig. 6 is a structural schematic diagram of the back of the transmission plate.

Fig. 7 is a structural schematic diagram of the valve stem.

FIG. 8 is a schematic cross-sectional view along line A-A of FIG. 7 .

Fig. 9 is a left side view of Fig. 7 .

Figure 10 is an assembled view of the valve stem inserted into the ball.

Fig. 11 is a schematic structural view of the pressure plate of the pressure storage cavity.

FIG. 12 is a schematic cross-sectional view along line A-A of FIG. 11 .

Fig. 13 is a schematic structural diagram of a positioning block.

FIG. 14 is a schematic cross-sectional view along line A-A of FIG. 13 .

Figure 15 is a schematic structural view of the push rod.

Fig. 16 is a schematic diagram of a partial cross-sectional structure of the push rod.

Fig. 17 is a structural schematic diagram of a one-way valve.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention will be further described.

As shown in the figure, the present invention includes a valve stem 1, a connecting body 2, a ball 3, a valve seat 4 and a valve seat push-out mechanism, and is characterized in that the valve seat push-out mechanism includes a valve seat push-out mechanism under pressure and Valve seat push-out mechanism;

The valve seat push-out mechanism under pressure includes a drive plate 5 connected to the valve stem, a push rod 6, an independent one-way valve 7, a downstream oil passage 9, a pressure storage cavity 8 and an upstream oil passage, and the one-way valve 7 Installed in the connecting body 2, the pressure storage cavity 8 communicates with the downstream of the one-way valve 7 through the downstream oil passage 9, and the upstream of the one-way valve 7 communicates with the upstream of the pipeline through the upstream oil passage 10. The one-way valve 7 is composed of a valve body 72 and a valve core 71 , and the valve core 71 is arranged in the valve body 72 .

The pressure storage cavity 8 is surrounded by the valve seat 4, the pressure storage cavity pressure plate 11 and the connecting body 2, the pressure storage cavity pressure plate 11 is connected with the fixed plate 12, and the ejector rod 6 is installed on the pressure storage cavity pressure plate 11 and the fixed plate 12 superior;

The transmission plate 5 is provided with a groove, and the end of the ejector rod 6 is provided with a top surface 61. The groove of the transmission plate matches the top surface 61 of the ejector rod. The front end 62 of the ejector rod is placed on the downstream end of the one-way valve. When the one-way valve 7 is opened and closed, when the top surface 61 of the tail end of the ejector rod falls into the groove of the transmission plate, the one-way valve 7 is closed, and the top surface 61 of the tail end of the ejector rod breaks away from the groove of the transmission plate, that is, when it is ejected, the one-way Valve 7 is open.

The ejector rod positioning block 13 is installed on the sphere 3, and the ejector rod positioning block 13 is provided with a positioning groove 131, and the ejector rod 6 tail end is provided with a positioning protrusion 63, and the positioning groove 131 is matched with the positioning protrusion 63, and when the ejector rod When the positioning protrusion 63 at the tail falls into the positioning groove 131 of the positioning block 13, the top surface 61 of the tail end of the ejector rod also falls in the groove of the drive plate, and the spool 71 of the check valve 7 is pushed back by the valve spring 14, and the one-way Close to valve 7.

The valve seat push-out mechanism when there is no pressure includes an annular step 31 arranged on the sphere 3, an oblique notch 32 arranged on the annular step 31, an oblique boss 41 arranged on the end surface of the outer ring of the valve seat 4, The spring 15 arranged between the valve seat 4 and the connecting body 2, the sealing ring 16 arranged on the outer ring of the valve seat 4, the oblique notch 32 and the oblique boss 41 match; when the ball valve is closed, the outer ring of the valve seat 4 The oblique boss 41 on the end face falls into the oblique notch 32, the valve seat sealing ring 16 fits the sphere 3, and the valve is closed and sealed; Port 32, the valve seat 4 is pushed open, and the valve seat sealing ring 16 is separated from the ball 3.

The transmission plate 5 is a circular plate, the center of the transmission plate 5 is a square hole 53, and the outer ring of the transmission plate 5 is provided with symmetrical oblique grooves 51 and 52. The upper and lower ends of the sphere 3 are placed in the fixed plate 12 . The pressure plate 11 of the pressure storage cavity is provided with a micro pressure relief through hole 19 , and the micro pressure relief through hole 19 communicates with the oil storage cavity 8 . The cross-sectional area 18 of the pressure storage cavity 8 is larger than the cross-sectional area 17 of the valve seat sealing ring. The top end of the valve stem 1 is provided with a square socket section 115 , and the square socket section 115 matches and clamps with the square socket hole 53 of the transmission plate 5 . The upper end of the sphere 3 is provided with a square notch 22, and the top end of the valve stem 1 is provided with a square connecting section 122, which is inserted into the square notch 22 on the top of the sphere 3; the four square connecting sections 122 A slope is cut on the surface respectively, which are respectively slope 132, slope 133, slope 134, and slope 135. After the top of the valve stem is inserted into the square notch 22 on the top of the ball 3, there is a gap between the valve stem 1 and the ball 3. There is a certain rotation gap 311, which ensures that the valve stem 1 continues to rotate within a certain angle (the ball does not rotate), and at the same time drives the transmission plate 5 to rotate so that the ejector rod 6 is ejected from the oblique groove on the transmission plate 5, Then push back the one-way valve 7, so that the valve seat 4 is pushed away from the sphere 3. After the valve seat 4 is pushed away from the sphere 3, the end of the valve stem 1 has rotated until there is no gap between the end of the valve stem and the notch of the sphere. At this time, continue to turn the valve stem 1 to drive the ball 3 to rotate under the micro torque state, and open the valve easily;

The working principle of the present invention is:

1. Open the ball valve: Turn the valve stem on the ball valve to a certain angle, usually 1-5 degrees, the transmission plate installed on the valve stem will rotate 1-5 degrees, and at the same time fall on the top of the inclined groove of the transmission plate. The rod is pushed out of the oblique groove, and the push rod is pushed to open the one-way valve.

Open the one-way valve, when the one-way valve is opened, the pressure upstream of the valve enters the pressure storage chamber through the one-way valve, because the design cross-sectional area of the pressure storage chamber is larger than the cross-sectional area of the valve seat sealing surface, when the pressure in the When the upstream pressure is equal, the seat will automatically push out, separating the seat from the ball.

When the valve stem rotates 5 degrees, the square section of the valve stem touches the sphere. At this time, since the sealing surface of the valve seat is separated from the sphere, the valve stem can be easily turned and rotated 90 degrees to open the ball valve in the state of no torque or slight torque.

2. Close the ball valve: reversely turn the valve stem on the ball valve so that the positioning protrusion at the end of the ejector rod falls into the positioning groove of the positioning block, and at the same time, the top surface of the tail end of the ejector rod also falls into the groove of the transmission plate , At this time, the spool of the one-way valve is pushed back by the valve spring, the one-way valve is closed, and the ball valve is also closed.

3. Opening the ball valve without pressure: When the ball valve is to be opened without pressure in the upstream, the valve seat will be pushed away as soon as the ball starts to rotate, and the ball and the sealing surface of the valve seat have no direct contact, so as to protect the spherical surface when the ball valve is opened without pressure in the upstream And the effect of the seat surface.

Claims (2)

1. Micro-torque ball valve during high pressure, mainly comprising valve rod, connecting body, spheroid, valve seat and valve seat pushing out mechanism, it is characterized in that described valve seat pushing out mechanism comprises valve seat pushing out mechanism when band pressure and no pressure time Valve seat push-out mechanism; The valve seat push-out mechanism under pressure includes a transmission plate connected to the valve stem, a push rod, an independent one-way valve, a downstream oil passage, a pressure storage cavity and an upstream oil passage. The one-way valve is installed in the connecting body, and the storage The pressure cavity communicates with the downstream of the one-way valve through the downstream oil passage, and the upstream of the one-way valve communicates with the upstream of the pipeline through the upstream oil passage; the one-way valve is composed of a valve body and a valve core, and the valve core is located at inside the valve body; The pressure storage cavity is surrounded by the valve seat, the pressure storage cavity pressure plate and the connecting body, the pressure storage cavity pressure plate is connected with a fixed plate, and the ejector rod is installed on the pressure storage cavity pressure plate and the fixed plate; There is a groove on the drive plate, which is a symmetrical oblique groove on the outer ring of the drive plate; the tail end of the ejector rod is provided with a top surface, and the groove of the drive plate matches the top surface of the ejector rod. The front end of the rod is pushed against the downstream end of the one-way valve, and the left and right movement of the ejector rod controls the opening and closing of the one-way valve. When the top surface of the rear end of the ejector rod falls into the groove of the transmission plate, the one-way valve is closed, and the top surface of the rear end of the ejector rod is separated from the transmission plate. The groove, that is, when it is ejected, the one-way valve opens; The ejector rod positioning block is installed on the ball, and the ejector rod positioning block is provided with a positioning groove. The end of the ejector rod is provided with a positioning protrusion. The positioning groove matches the positioning protrusion. When the positioning groove of the block is inserted, the top surface of the tail end of the ejector rod also falls in the groove of the transmission plate, the valve core of the one-way valve is pushed back by the valve spring, and the one-way valve is closed; The valve seat push-out mechanism when there is no pressure includes an annular step on the sphere, an oblique notch on the annular step, an oblique boss on the end surface of the outer ring of the valve seat, an The spring between the bodies, the sealing ring on the outer ring of the valve seat, the oblique notch and the oblique boss match; when the ball valve is closed, the oblique boss on the end face of the outer ring of the valve seat falls into the oblique notch, and the valve The sealing ring of the seat fits the sphere, and the valve is closed and sealed; when the sphere is turned to open the valve, the oblique protrusion of the valve seat leaves the oblique notch of the sphere, the valve seat is pushed open, and the sealing ring of the valve seat is separated from the sphere; The transmission plate is a circular plate, the center of the transmission plate is a square socket, and the upper and lower ends of the sphere are placed in the fixed plate; the pressure storage chamber pressure plate is provided with a micro pressure relief through hole, the micro pressure relief through hole is connected with the storage The pressure cavity is connected; the cross-sectional area of the pressure storage cavity is greater than the cross-sectional area of the valve seat sealing ring. 2. A micro-torque ball valve at high pressure according to claim 1, characterized in that the top of the valve stem is provided with a square socket section, the center of the transmission plate is provided with a square socket, and the square socket section is matched with the square socket of the transmission plate. tight; The upper end of the sphere is provided with a square notch, and the top of the valve stem is provided with a square connecting section, which is inserted into the square notch at the upper end of the sphere; the four surfaces of the square connecting section are respectively cut with a slope, and the slope makes After the top of the valve stem is inserted into the square notch on the upper end of the ball, there is a certain rotation gap between the valve stem and the ball. The oblique groove on the plate is ejected, and then the one-way valve is pushed open, so that the valve seat is pushed away from the ball. After the valve seat is pushed away from the ball, the top of the valve stem has rotated to the point where there is no gap between the top of the valve stem and the square notch. , At this time, continue to turn the valve stem to drive the ball to rotate under the state of micro torque, and open the valve easily.