CN104329480B - A kind of electrical ball valve - Google Patents

Abstract

The invention discloses an electric ball valve, which comprises a valve sleeve, a trunnion ball valve core, a valve seat and a valve stem. The valve sleeve includes a valve body and a sleeve. A motor is installed on the sleeve, an inlet hole and two outlet holes are arranged on the valve body, an inlet connection passage and an outlet connection passage are arranged in the valve body, and each valve seat rests against the energy generating The elastic deformation exerts elastic force to press the flexible compensating parts of the valve seat. Each flexible compensating part leans against a screw plug. The valve seat is provided with a first middle hole, and the flexible compensating part is provided with a second middle hole. The invention compensates the trunnion ball valve core and the valve seat by installing the flexible compensator, the compensation amount has the self-adaptability with the change of temperature and pressure, has good compensation self-adaptability, and can meet different working conditions of geological layers with different depths. The condition requirements ensure the long-term safe and reliable sealing of the ball valve under different working conditions.

Description

An electric ball valve

technical field

The invention belongs to the field of ball valves, and more specifically relates to an electric ball valve.

Background technique

In occasions such as nuclear power plants, crude oil extraction, and natural gas extraction, it is necessary to control high-temperature and high-pressure fluids. The water flooding fracturing technology often used in crude oil extraction is a water flooding multi-stage fracturing technology that uses plugging balls to perform staged fracturing on different layers. The casting diameter of the plugging balls decreases from top to bottom, and the corresponding pipeline The diameter is also reduced. For example, the ball valve is used in it, and the valve-controlled multi-stage fracturing technology is adopted. Compared with the traditional fracturing technology, the operation is simple, and only the corresponding control signal is given to control the positive and negative rotation of the motor to realize the reversing of the orifice. Complete the opening and closing function of the fracturing port of the system, simplify the structure of the whole system, keep the diameter of the fracturing pipelines at all levels consistent, and do not need to reduce the diameter, which not only reduces the mining cost, but also improves the working efficiency and efficiency of the system. Yield.

The valves required in these fields often meet the following characteristics:

1) The working pressure is high, and its maximum pressure can reach more than 30MPa, even to 90MPa;

2) The working temperature is high, and its maximum temperature can reach above 150°C;

3) The installation space is small, and the structure needs to be compact and easy to install;

4) It is safe and reliable, requires zero leakage, and will not cause malfunction due to leakage.

The ball valve can flexibly control the confluence, diversion and switching of the flow direction of the medium by rotating the spherical trunnion ball valve core. Ball valves are widely used in various industrial fields due to their good sealing performance (the spherical sealing form can achieve complete sealing) and simple structure. Among the high-temperature and high-pressure valves at home and abroad, Swagelok series ball valves are representative, such as 83 series and H83 series high-temperature and high-pressure valves and HOKE76 series. However, the application of these ball valves in the above-mentioned occasions has the following problems:

(1) Due to the use of multiple disc springs stacked together for temperature, pressure and wear compensation, the volume of each disc spring is relatively large, resulting in an excessively large installation volume;

(2) It adopts a square structure, and the inlet and outlet are not arranged on the same end face, which is not conducive to the integration of pipeline installation and requires a large installation space. It is difficult to install the circular pipeline commonly used in the chemical industry such as Shiliu. Very good compatibility;

(3) The force generated by the compression amount of multiple disc springs is compensated, and the compression amount is selected according to the sealing requirements under high pressure conditions, which will inevitably cause excessive compensation force at low pressure, increase the friction force, and require a larger drive Power, but also accelerated the wear of the ball valve.

Contents of the invention

In view of the above defects or improvement needs of the prior art, the present invention provides an electric ball valve, which uses a flexible compensator to compensate for temperature, pressure and wear, has reliable sealing performance, and can ensure the reliability of commutation. The overall cylindrical structure can be easily installed in various industrial piping systems.

In order to achieve the above object, according to one aspect of the present invention, an electric ball valve is provided, including a valve sleeve and a trunnion ball valve core arranged in the valve sleeve, a valve seat against the trunnion ball valve core and The valve stem that can drive the trunnion ball valve core to rotate, the number of valve seats is two, the two valve seats are symmetrically distributed on both sides of the trunnion ball valve core, the valve sleeve is cylindrical as a whole, and the valve sleeve includes the valve body And the sleeve fixedly installed on the valve body. The trunnion ball valve core is provided with an inflow channel and an outflow channel. The end of the sleeve away from the valve body is equipped with a motor that can drive the valve stem to rotate. The valve body is far away from the sleeve. There is an inlet hole and two outlet holes on the end surface of the valve body. The axis of the inlet hole is on the same line as the axis of the valve body. The two outlet holes are symmetrically distributed on both sides of the inlet hole with respect to the center of the inlet hole. The valve The body is provided with an inflow connection passage for connecting the inflow hole and the inflow channel and an outflow connection passage for connecting the outflow hole and the outflow passage. The flexible compensator that presses the valve seat, each flexible compensator is against a screw plug, the screw plug is installed on the valve body, the valve seat, the flexible compensator and the screw plug are arranged along the radial direction of the valve body, the valve seat is A first middle hole is provided for communicating with the outflow channel on the trunnion ball valve core, and a second middle hole for connecting the first middle hole and the outflow hole is arranged on the flexible compensator.

Preferably, the valve stem includes a large end and a small end, the large end of the valve stem is connected to the rotating shaft of the motor, the small end of the valve stem leans against the trunnion ball valve core, and the large end of the valve stem is processed with The arc-shaped boss with an arc of 90°, the inner wall of the valve body is processed with an arc-shaped groove with an arc of 270° corresponding to the arc-shaped boss on the valve stem, and the arc-shaped boss rotates in the arc-shaped groove, thereby Control the rotation stroke of the valve stem within 180°.

Preferably, the end of the trunnion ball valve core close to the valve stem is provided with a first square hole, and the end of the valve stem close to the trunnion ball valve core is provided with a first square hole corresponding to the first square hole. The first square boss extends into the first square hole so that the valve stem drives the trunnion ball valve core to rotate.

Preferably, the end of the valve stem close to the motor is provided with a second square hole, the shaft of the motor is provided with a second square boss corresponding to the second square hole, and the second square boss extends into the second square hole Inside, so that the motor drives the valve stem to rotate.

Preferably, a thrust ball bearing is installed in the sleeve, and the rotating shaft of the motor passes through the thrust ball bearing and is connected to the valve stem. The end of the valve stem close to the motor rests on the side of the thrust ball bearing, and the second square There is a gap between the end surface of the end of the boss close to the valve stem and the inner wall of the valve stem at the second square hole.

Preferably, the flexible compensator is provided with an elastically deformable curved portion, and the curved portion abuts against the valve seat.

Preferably, a first sealing ring is sleeved on the valve seat.

Preferably, a second sealing ring is sleeved on the screw plug.

Preferably, a third sealing ring is sleeved on the valve stem.

Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:

1) The present invention compensates the trunnion ball valve core and the valve seat by installing the flexible compensator, the compensation amount has the adaptability to the change of temperature and pressure, has good compensation adaptability, and can meet the requirements of different depth geological layers. The requirements of different working conditions ensure the long-term safe and reliable sealing of the ball valve under different working conditions;

2) The inlet and outlet holes of the electric ball valve are arranged on the same end face of the valve body, the overall volume is small, the structure is compact, and it is compatible with the narrow installation space of the annular pipeline;

3) The sleeve is equipped with a thrust ball bearing to ensure the flexible and reliable movement of the valve stem under high pressure, which reduces the rotational torque, reduces the power loss of the ball valve, and is more energy-saving.

Description of drawings

Fig. 1 is a sectional view of the present invention;

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

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

As shown in Figures 1 to 2, an electric ball valve includes a valve sleeve 1, a trunnion ball valve core 7 arranged in the valve sleeve 1, a valve seat 2 against the trunnion ball valve core 7 and The valve stem 8 that can drive the trunnion ball valve core 7 to rotate, the number of valve seats 2 is two, and the two valve seats 2 are symmetrically distributed on both sides of the trunnion ball valve core 7, and the valve sleeve 1 is cylindrical as a whole , the valve sleeve 1 includes a valve body 10 and a sleeve 11 fixedly installed on the valve body 10, the trunnion ball valve core 7 is provided with an inflow channel 13 and an outflow channel 14, the inflow channel 13 and the outflow channel 14 Form a T-shaped runner. The end of the sleeve 11 away from the valve body 10 is equipped with a motor 15 capable of driving the valve stem 8 to rotate. The motor 15 can be a stepping motor, a reduction motor or a servo motor. An inlet hole 16 and two outlet holes 17 are arranged on the end surface of the valve body 10 away from the sleeve 11, and the inlet hole 16 and the outlet hole 17 are arranged on the same end surface of the valve body, the overall volume is small and the structure is compact, Compatible with the narrow installation space of the annular pipeline; the inner walls of the valve body 10 at the inlet hole 16 and the outlet hole 17 are provided with threads, so as to connect to external pipelines. Inlet hole 16 can enter high-pressure fluid. The axis of the inlet hole 16 is in line with the axis of the valve body 10 to balance the force on the trunnion ball valve core 7 . The two outlet holes 17 are symmetrically distributed on both sides of the inlet hole 16 with respect to the center of the inlet hole 16, and the valve body 10 is provided with an inlet connecting passage 18 for communicating with the inlet hole 16 and the inlet channel 13 and for communicating with the inlet hole 16. The outflow connection path 19 between the outflow hole 17 and the outflow channel 14, each valve seat 2 is abutted against a flexible compensator 5 that can produce elastic deformation so as to apply elastic force to compress the valve seat 2, and each flexible compensator 5 There is a screw plug 4 abutting against each other, and the screw plug 4 is installed on the valve body 10 .

Preferably, referring to FIG. 2 , the flexible compensator 5 is provided with an elastically deformable curved portion 27 , and when the curved portion 27 abuts against the valve seat 2 , it can undergo elastic deformation for compensating the valve seat. 2 and the deformation of the trunnion ball spool 7. The shape of the flexible compensator 5 can be changed in many ways, and is not limited to the shape shown in the figure, for example, it can be I-shaped, as long as it has an elastically deformable bending portion 27 . Since the flexible compensator 5 with a T-shaped structure in the figure is used instead of an ordinary disc spring or spring, the volume of the ball valve can be made very small, and the outer diameter of the valve sleeve 1 can be processed to about 16mm, so the ball valve It can be applied to industrial pipelines with relatively small inner diameters.

The valve seat 2, the flexible compensator 5 and the screw plug 4 are arranged along the radial direction of the valve body 10, and the valve seat 2 is provided with a first middle hole 20 for communicating with the outflow channel 14 on the trunnion ball valve core 7 , the flexible compensator 5 is provided with a second middle hole 21 for communicating with the first middle hole 20 and the outflow hole 17 . When the trunnion ball valve core 7 is driven by the motor 15 to rotate, its oil outlet channel 14 can communicate with the first middle hole 20 on the two valve seats 2 respectively, so as to realize the reversing of the ball valve. The valve body 10 is blocked by a screw plug 4, which is convenient for installation, and the initial preload of the valve seat 2 and the trunnion ball valve core 7 can be adjusted to ensure the sealing requirement.

The trunnion ball valve core 7 is made of corrosion-resistant alloy, which has better high-pressure resistance; the valve seat 2 is made of high-strength engineering plastics, so that the sealing part between the trunnion ball valve core 7 and the valve seat 2 is soft. Sealing fit, small sealing specific pressure, very small leakage, safe and reliable; a spherical groove is processed on the end face of the valve seat 2 that cooperates with the trunnion ball valve core 7, on the one hand, the sealing surface can be reduced to reduce the sealing required Sealing pretightening force, on the other hand, the pressure of the pressure medium in the spherical groove can further increase the sealing specific pressure and improve the reliability of the sealing; the combination of the initial pretightening force provided by the screw plug 4 and the flexible compensator 5 and the pressure of the fluid Under the action of the trunnion ball valve core 7 and the valve seat 2 closely fit.

Compared with traditional springs, disc springs, etc., the flexible compensator 5 is smaller in size, easy to manufacture, small and compact in structure, and high in rigidity, and is suitable for use when the volume of the valve body 10 is relatively small. The main functions of the flexible compensator 5 are as follows: First, when the ball valve experiences a large temperature gradient, it performs two-way thermal compensation for the thermal expansion generated by the valve seat 2 and the trunnion ball valve core 7 to prevent thermal expansion. The second is to apply a certain initial pretightening force to the valve seat 2, which expands the working pressure range of the ball valve, so that the ball valve has leak-proof integrity in both low-pressure and high-pressure systems; the third is used to compensate the ear The wear of the axial ball valve core 7 and the valve seat 2 due to long-term frictional rotation causes a decrease in the specific pressure of the seal, which eventually leads to seal failure and leakage.

On the valve body 10, the two outlet holes 17 (port A and port B respectively) are all set on the same end face where the inlet hole 16 (port P) is located, which can facilitate the installation of the pipeline and save the installation of the entire ball valve space, making it more compact. This ball valve can meet the high pressure and high temperature occasions where the installation space is limited, and the working medium can be high flame retardant hydraulic flow. Because the electric control driven by the motor 15 is adopted, the automatic control of the flow path can be completed, and it is suitable for fields such as gas flow, natural gas underground driving and production systems, and power plants.

Further, grooves are processed on the outer circle of the valve seat 2 for installing the first sealing ring 3 , and the first sealing ring 3 cooperates with the valve body 10 to form a static seal. The flexible compensator 5 is T-shaped as a whole, and the curved portion 27 is arranged at one end with a larger cross-sectional area. The thickness can adjust its stiffness. A groove is processed on the outer circle of the screw plug 4 for installing the second sealing ring 6 , and the second sealing ring 6 cooperates with the valve body 10 to form a static seal. The end surface of the screw plug 4 is provided with a sinking groove for placing the flexible compensating part 5, and the flexible compensating part 5 is fixed to prevent it from moving along the axial direction, and the screw plugs 4 at both symmetrical ends can be loosened or tightened to adjust the valve seat 2. The size of the initial preload. A third sealing ring 9 is installed on the valve stem 8 to prevent fluid from leaking into the motor 15 inside.

Preferably, the valve stem 8 includes a large end 22 and a small end 23, the large end 22 of the valve stem 8 is connected to the rotating shaft of the motor 15, and the small end 23 of the valve stem 8 abuts against the trunnion ball valve core 7 , the large end 22 of the valve stem 8 is processed with an arc-shaped boss 24 with a radian of 90°, and the inner wall of the valve body 10 is processed with an arc-shaped concave with an arc of 270° corresponding to the arc-shaped boss 24 on the valve stem 8. groove, the arc-shaped boss 24 rotates in the arc-shaped groove, thereby controlling the rotation stroke of the valve stem 8 within 180°. When the common deceleration motor 15 is selected, the inner wall of the valve body 10 at the arc-shaped groove can limit the position of the arc-shaped boss 24, and the valve stem 8 can only drive the trunnion ball valve core 7 to rotate clockwise or counterclockwise. 180°. When the trunnion ball valve core 7 reaches a limit position, its outflow channel 14 communicates with one of the outflow holes 17 (port A), and when it reaches another limit position, its outflow channel 14 communicates with the other outflow hole. 17 (B port) is connected to realize the precise reversing of the ball valve.

The inflow channel 13 of the trunnion ball valve core 7 is a through hole, so that the inflow channel 13 and the outflow channel 14 of the trunnion ball valve core 7 form a T-shaped flow channel. Since the inflow channel 13 is a through hole, the high-pressure medium flowing in from the inflow hole 16 can be introduced into the other side of the trunnion ball valve core 7, so that the axial force of the entire trunnion ball valve core 7 is balanced.

The trunnion ball valve core 7 and the valve body 10 are clearance fit, and the inner wall of the valve body 10 can radially limit the trunnion ball valve core 7, but at the same time there is a certain gap between the two, so that The trunnion ball valve core 7 can move a small amount in the radial direction to compensate fluctuations in pressure and temperature, and the overall structure formed by the two is a semi-floating structure.

Further, the end of the trunnion ball valve core 7 close to the valve stem 8 is provided with a first square hole, and the end of the valve stem 8 close to the trunnion ball valve core 7 is provided with a hole corresponding to the first square hole. The first square boss 25 extends into the first square hole so that the valve stem 8 drives the trunnion ball valve core 7 to rotate. One end of the valve stem 8 near the motor 15 is provided with a second square hole, the rotating shaft of the motor 15 is provided with a second square boss 26 corresponding to the second square hole, and the second square boss 26 stretches into the second square hole. In the square hole, so that the motor 15 drives the valve stem 8 to rotate, which makes the connection more convenient. Preferably, a thrust ball bearing 12 is installed in the sleeve 11, and the rotating shaft of the motor 15 passes through the thrust ball bearing 12 and is connected to the valve stem 8, and the end of the valve stem 8 close to the motor 15 abuts against the thrust ball bearing 12 on the side. There is a gap between the end face of the second square boss 26 near the end of the valve stem 8 and the inner wall of the valve stem 8 at the second square hole, the axial force of the valve stem 8 acts on the thrust ball bearing 12, and the motor 15 The rotating shaft is not affected by the axial force of the valve rod 8, which is beneficial to prolong the service life of the motor 15. Because the thrust ball bearing 12 is installed, to ensure the flexible and reliable movement of the valve rod 8 on the ball valve, the trunnion ball valve core 7 and the rotating shaft on the motor 15 under high pressure, the frictional resistance is reduced and the rotational torque is reduced.

When assembling, first install the trunnion ball valve core 7 into the inner cavity of the valve body 10, then install the valve seat 2, the flexible compensator 5 and the screw plug 4 in sequence, and adjust the screw plugs 4 on both sides to load on the valve seat 2 and the lugs. The initial pre-tightening force on the shaft ball valve core 7 makes it meet the sealing specific pressure requirements; then install the valve stem 8, first put the thrust ball bearing 12 into the sleeve 11, and then put the sleeve 11 and the valve body 10 Install it. Insert the rotating shaft into the valve stem 8, and connect the motor 15 with the sleeve 11 with screws.

The electric ball valve of the present invention has the following advantages:

1), the trunnion ball valve core 7 is adopted, and a through hole is opened in its center as the inflow channel 13, so that both ends of the inflow channel 13 of the trunnion ball trunnion ball valve core 7 have pressure medium, force balance;

2), the valve seat 2 is made of high-strength engineering plastics, so that the sealing part of the valve seat 2 and the trunnion ball valve core 7 realizes a soft sealing fit, and a sinking groove is opened on the sealing end surface, and the second sealing ring is installed at the sinking groove 6. To reduce the sealing specific pressure and initial pre-tightening force, to achieve zero leakage sealing, safe and reliable;

3) The ball valve has good compensation adaptability. The ball valve needs to meet the requirements of different working conditions of different depths of geological formations, and in order to adapt to the requirements of different working conditions, the ball valve needs to be slightly compensated. The present invention installs the flexible compensation part 5 to adjust the trunnion ball valve core 7 and the valve seat 2. Compensation of temperature and pressure, the compensation amount is adaptive to the change of temperature and pressure, which ensures the long-term safe and reliable sealing of the ball valve under different working conditions;

4) A thrust ball bearing 12 is installed in the sleeve 11 to ensure the flexible and reliable movement of the moving parts of the ball valve under high pressure, reduce the rotational torque of the motor 15 shaft, reduce the power loss of the ball valve, and save energy.

5), the inlet hole 16 and the outlet hole 17 of the ball valve are arranged on the same end face, the overall volume is small, the structure is compact, and it is compatible with the narrow installation space of the annular pipeline.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (9)

1. an electrical ball valve, comprise valve pocket (1) and be arranged on gudgeon ball type valve core (7) in valve pocket (1),Be resisted against the valve seat (2) on gudgeon ball type valve core (7) and can drive gudgeon ball type valve core (7)The valve rod (8) of rotation, the quantity of valve seat (2) is two, two valve seats (2) are symmetrically distributed inThe both sides of gudgeon ball type valve core (7), valve pocket (1) entirety is cylindricality, and valve pocket (1) comprises valve body(10) and be fixedly mounted on the sleeve (11) on valve body (10), on gudgeon ball type valve core (7)Be provided with influent stream passage (13) and go out circulation road (14), it is characterized in that: sleeve (11) is away from valveOne end of body (10) is provided with the motor (15) that energy actuate valve stem (8) is rotated, valve body (10)On end face away from sleeve (11), be provided with a flow-in hole (16) and two flow-out holes (17),The axis of the axis of flow-in hole (16) and valve body (10) is collinear, two flow-out holes (17) aboutFlow-in hole (16) Central Symmetry is distributed in the both sides of flow-in hole (16), in valve body (10), arrangesBe useful on and be communicated with the influent stream connecting path (18) of flow-in hole (16) and influent stream passage (13) and useIn be communicated with flow-out hole (17) with go out circulation road (14) go out to flow connecting path (19), each valve seat(2) thus on all can produce the flexibility that elastic deformation applies elastic compression valve seat (2) and mend against havingRepay part (5), on each flexible compensation part (5), all against there being a plug screw (4), plug screw (4) is pacifiedBe contained in valve body (10) upper, valve seat (2), flexible compensation part (5) and plug screw (4) are along valve body (10)Radially setting, valve seat (2) be provided with for be communicated with on gudgeon ball type valve core (7) go out circulationFirst interstitial hole (20) in road (14), flexible compensation part (5) is provided with for being communicated with firstBetween second interstitial hole (21) of hole (20) and flow-out hole (17).

2. a kind of electrical ball valve according to claim 1, is characterized in that: described valve rod (8) comprisesLarge end (22) and small end (23), the large end (22) of valve rod (8) is connected to motor (15)In rotating shaft, it is upper that the small end (23) of valve rod (8) is resisted against gudgeon ball type valve core (7), valve rod (8)Large end (22) on to be processed with radian be the arc boss (24) of 90 °, in valve body (10)Wall be processed with valve rod (8) on the corresponding radian of arc boss (24) be that the arc of 270 ° is recessedGroove, arc boss (24) rotates in arc groove, thereby by the rotational travel control of valve rod (8)In 180 °.

3. a kind of electrical ball valve according to claim 1, is characterized in that: described gudgeon ball type valve core(7) be provided with the first square opening near one end of valve rod (8), described valve rod (8) is near earOne end of axle ball type valve core (7) is provided with and corresponding the first square boss of the first square opening(25), the first square boss (25) thus stretch into and make valve rod (8) in the first square openingDrive gudgeon ball type valve core (7) to rotate.

4. a kind of electrical ball valve according to claim 3, is characterized in that: described valve rod (8) is closeOne end of motor (15) is provided with the second square opening, in the rotating shaft of described motor (15), is provided withWith corresponding the second square boss of the second square opening (26), the second square boss (26) stretches into secondIn square opening, thereby motor (15) band ovable valve stem (8) is rotated.

5. a kind of electrical ball valve according to claim 4, is characterized in that: in described sleeve (11)Thrust ball bearing (12) is installed, and the rotating shaft of described motor (15) is through thrust ball bearing (12)After to be connected to valve rod (8) upper, valve rod (8) is resisted against thrust ball near one end of motor (15)On the side of bearing (12), the second square boss (26) is near the end face of one end of valve rod (8)And there is gap in valve rod (8) between the inwall at the second square opening place.

6. a kind of electrical ball valve according to claim 1, is characterized in that: described flexible compensation part (5)On be provided with elastically-deformable bend (27) can occur, described bend (27) is connected to valve seat(2) on.

7. a kind of electrical ball valve according to claim 1, is characterized in that: the upper cover of described valve seat (2)Be connected to the first sealing ring (3).

8. a kind of electrical ball valve according to claim 7, is characterized in that: the upper cover of described plug screw (4)Be connected to the second sealing ring (6).

9. a kind of electrical ball valve according to claim 8, is characterized in that: the upper cover of described valve rod (8)Be connected to valve rod (8) the 3rd sealing ring (9).