CN212564498U - Ball valve - Google Patents

Abstract

The utility model provides a ball valve, which comprises a valve seat, a valve core, a rotating shaft and a sealing element, wherein the valve core is rotatably arranged in a first channel of the valve seat through the rotating shaft, and the sealing element is arranged between the valve core and the inner wall of the first channel; the valve core is internally provided with a second channel for fluid to flow through. The valve core is respectively provided with a plugging surface and an opening surface in different directions of the circumferential direction of the rotating shaft, the plugging surface is an arc surface, the opening surface is provided with an opening communicated with the second channel, and the distance between the opening surface and the rotating shaft is smaller than the distance between the plugging surface and the rotating shaft; when the valve core rotates to a position where the plugging surface is opposite to the first channel, the plugging surface abuts against the sealing element and seals the first channel through the sealing element; when the valve core rotates to the position that the opening surface is opposite to the first channel, the first channel is communicated with the second channel. The utility model discloses a ball valve can reduce the load of motor, helps prolonging the life of motor.

Description

Ball valve

Technical Field

The utility model relates to a gas table ball valve technical field, in particular to ball valve.

Background

The ball valve is used as a switch device, and has the characteristics of simple structure, relatively small volume, light weight and convenience in maintenance, so that the ball valve is widely applied to industries such as gas and the like.

The ball valve is a valve which uses a ball body with a circular channel as an opening and closing part and realizes the opening and closing actions by the rotation of the ball body along with a valve rod. At present, a ball valve mainly comprises a valve seat and a valve core with a circular channel, wherein the valve core is of a whole ball structure, is arranged in the valve seat as an opening and closing part, and is connected with the valve seat in a sealing way through a sealing ring. The valve core is connected with the motor through the valve rod, and under the driving of the motor, the valve core can be driven by the valve rod to rotate relative to the valve seat in the valve seat so as to communicate or block the air inlet and the air outlet in the valve seat, and thus, the opening and closing of a pipeline or equipment are realized.

However, since the valve core is of a whole-ball structure, in the process of rotating in the valve seat, the valve core is sealed with the valve seat through the compression sealing ring, so that the motor is always in a high-load state, and the service life of the motor is easily influenced in the past.

SUMMERY OF THE UTILITY MODEL

The utility model provides a ball valve can reduce the load of motor, helps prolonging the life of motor.

The embodiment of the utility model provides a ball valve, including valve seat, case, pivot and sealing member, have the first passageway on the valve seat, the case is rotatably arranged in the first passageway through the pivot, the sealing member is arranged between the inner wall of case and first passageway; the valve core is internally provided with a second channel for fluid to flow through, the valve core is respectively provided with a plugging surface and an opening surface in different directions of the circumferential direction of the rotating shaft, the sealing element is arranged in the valve seat, the plugging surface is used for being abutted against the sealing element to seal the first channel, and the plugging surface is an arc surface; the opening surface is used for communicating the first channel and the second channel when being opposite to the first channel; the distance L1 between the opening surface and the rotating shaft is smaller than the distance L2 between the blocking surface and the rotating shaft.

According to the ball valve, optionally, when the valve core rotates to the position where the blocking surface is opposite to the first channel, the blocking surface abuts against the sealing element and seals the first channel through the sealing element; when the valve core rotates to the position that the opening surface is opposite to the first channel, the first channel is communicated with the second channel.

In the ball valve as described above, optionally, the opening surface has an opening for communicating the first passage and the second passage.

According to the ball valve, optionally, the valve seat comprises a valve cavity, an air inlet and an air outlet, the air inlet, the valve cavity and the air outlet are sequentially connected to form a first channel, the air inlet and the air outlet are oppositely arranged on the valve seat, and the valve core is arranged in the valve cavity.

In the ball valve as described above, optionally, the sealing member is provided in the valve chamber and surrounds the periphery of the air outlet.

In the ball valve as described above, optionally, the opening surface is an arc surface.

In the ball valve described above, optionally, when the valve core rotates, there is a gap between the opening surface and the sealing member.

In the ball valve as described above, optionally, the blocking surface is located on a spherical surface with the center of the rotating shaft as the center of the sphere.

In the ball valve described above, optionally, the blocking surface is a torus.

In the ball valve as described above, optionally, the opening surface is a part of a spherical surface, and a spherical center corresponding to the opening surface is located on a side of the center of the rotating shaft, which is away from the opening surface.

In the ball valve as described above, optionally, the radius corresponding to the spherical surface on which the opening surface is located is larger than the radius corresponding to the spherical surface on which the blocking surface is located.

In the ball valve as described above, optionally, the edge of the opening surface is smoothly connected with the edge of the sealing surface, and the distance from the surface of the valve element to the rotating shaft gradually increases from the opening surface to the sealing surface.

In the ball valve, optionally, the difference between the distance from the blocking surface to the rotating shaft and the distance from the opening surface to the rotating shaft ranges from 0.3mm to 0.5 mm.

In the ball valve as described above, the open face may optionally have a corresponding central angle of between 30 ° and 90 °.

According to the ball valve, optionally, the number of the opening surfaces is two, the opening surfaces are respectively arranged on two opposite sides of the valve core, and the blocking surface is positioned between the two opening surfaces.

In the ball valve described above, optionally, the opening edge has a rounded corner.

In the ball valve, optionally, the valve core is a plastic part.

In the ball valve, optionally, the valve core has a mounting surface at a position corresponding to the end of the rotating shaft, and the mounting surface has a mounting hole matched and connected with the rotating shaft.

In the ball valve described above, the mounting hole is optionally a non-circular hole.

According to the ball valve, optionally, the valve core is further provided with a limiting protrusion, the limiting protrusion is arranged opposite to the mounting hole, the inner side wall of the first channel is provided with a limiting hole, and the limiting protrusion is rotatably assembled in the limiting hole.

The utility model provides a ball valve, through the setting of case shutoff face and opening face in the ascending not equidirectional of pivot week, the shutoff face is the arcwall face, and the distance L1 between opening face and the case center is less than the distance L2 of shutoff face and pivot, can regard as a non-spherical structure with the case like this. When the valve core rotates in the first channel of the valve seat to a position where the blocking surface is opposite to the first channel, the blocking surface seals the first channel through a sealing element, so that the ball valve is in a closed state. Because the distance L1 between the opening surface and the rotating shaft is smaller than the distance L2 between the blocking surface and the rotating shaft, when the ball valve is in a closed state, the compression amount of the valve core to the sealing element is larger, the mutual friction force between the ball valve and the sealing element is also larger, and the load of a motor required for driving the ball valve to rotate is also larger at the moment. Correspondingly, when the valve core rotates in the first channel of the valve seat until the opening surface is opposite to the first channel, the first channel is communicated through the second channel, so that the ball valve is in an open state. When the ball valve is in an open state relative to the closed state of the ball valve, the compression amount of the valve core on the sealing element is small, and the load of a motor for driving the ball valve to rotate is small. Therefore, the utility model provides a whole ball structure of case among the ball valve prior art, through the structure that changes the case, can be so that the compression of sealing member changes to some extent in the switch operation of ball valve, and not be in invariable high compression state always, and then can avoid the motor to be in high load state always, can reduce the load of motor, help prolonging the life of motor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a ball valve in a closed state according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the ball valve of FIG. 1 in the direction A-A;

fig. 3 is a schematic structural diagram of a ball valve provided in an embodiment of the present invention in an open state;

FIG. 4 is a cross-sectional view of the ball valve of FIG. 3 in the direction B-B;

fig. 5 is a perspective view of a valve cartridge according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a valve core provided in an embodiment of the present invention;

fig. 7 is a top view of the valve cartridge of fig. 6.

The attached drawings indicate the following:

100-ball valve; 10-a valve seat; 11-a valve frame; 12-valve cover; 13-an air inlet; 14-an air outlet; 15-valve cavity; 16-assembly holes; 17-a limiting hole;

20-a valve core; 21-plugging surface; 22-open side; 221-opening; 23-a second channel; 24-a mounting surface; 241-mounting holes; 25-limiting protrusions;

30-a rotating shaft; 40-a seal; 50-a first seal ring; 60-second seal ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a ball valve in an open state according to an embodiment of the present invention, which is used for controlling on/off of flow rates such as a gas meter and a water meter, fig. 2 is a sectional view of the ball valve in fig. 1 in an a-a direction, fig. 3 is a schematic structural diagram of the ball valve in a closed state according to an embodiment of the present invention, and fig. 4 is a sectional view of the ball valve in fig. 1 in a B-B direction.

Referring to fig. 1 to 4, the embodiment of the present invention provides a schematic structural diagram and a cross-sectional view of a ball valve 100 in different states. As can be seen from fig. 1 to 4, the ball valve 100 may include a valve seat 10, a valve core 20, a rotating shaft 30 and a sealing member 40, wherein the valve seat 10 has a first passage such that a fluid, such as gas, etc., may pass between the valve seat 10 and an external device (such as a pipe, etc.) through the first passage. The valve core 20 can be rotatably disposed in the first channel through the rotating shaft 30, and the sealing member 40 is disposed between the valve core 20 and the inner wall of the first channel, so that when the rotating shaft 30 is connected to a driving device such as a motor, etc., the valve core 20 can be driven by the rotating shaft 30 as an opening and closing member of the ball valve 100 to rotate in the first channel relative to the valve seat 10 and abut against the sealing member 40 to seal or conduct the first channel, thereby making the ball valve 100 in a closed or open state.

The valve element 20 has a second passage 23 for fluid to flow through, and the valve element 20 has a sealing surface 21 and an opening surface 22 in different directions along the circumferential direction of the rotating shaft 30. A seal 40 is provided in the valve seat 10. The sealing surface 21 is adapted to abut against the seal 40 to seal the first passage, thereby allowing the ball valve 100 to assume a closed state. The blocking surface 21 may be an arcuate surface to facilitate rotation of the valve spool 20 within the first passage. The opening surface 22 is used to communicate the first passage and the second passage 23 opposite to the first passage, so that the ball valve 100 assumes an open state. The opening surface 22 has an opening 221 communicating with the second passage 23, and the opening 221 is used for communicating the first passage with the second passage 23. The distance L1 between the opening surface 22 and the rotating shaft 30 is smaller than the distance L2 between the blocking surface 21 and the rotating shaft 30. That is, the opening surface 22 is a surface of the valve body 20 that is recessed toward the rotation shaft 30 with respect to the closing surface 21. This allows the valve core 20 to be considered a non-spherical structure rather than a full-ball structure as in the prior art, due to the presence of the land 22.

The distance L1 between the opening surface 22 and the rotation shaft 30 can be understood as a straight line distance between any point on the opening surface 22 and the center o1 of the rotation shaft 30 when the axis of the rotation shaft 30 passes through the valve body 20 horizontally. Accordingly, the distance L2 between the blocking surface 21 and the rotating shaft 30 can also be understood as a straight line distance between any point on the blocking surface 21 and the center of the rotating shaft 30 when the axis of the rotating shaft 30 horizontally penetrates the valve element 20. The center o1 of the shaft 30 can be understood as the position of the center point on the axis of the shaft 30. Since the valve element 20 is rotated in the valve seat 10 by the rotation shaft 30, the center o1 of the rotation shaft 30 can also be regarded as the center of the valve element 20.

Specifically, referring to fig. 1 and 2, when the valve core 20 is rotated to a position where the blocking surface 21 is opposite to the first passage, the blocking surface 21 may abut on the sealing member 40 and seal the first passage with the sealing member 40. At this time, the ball valve 100 is in a closed state, and fluid cannot flow through the first passage to an external device (such as a pipe). Since the distance L1 between the opening surface 22 and the rotation shaft 30 is smaller than the distance L2 between the closing surface 21 and the rotation shaft 30, and the closing surface 21 seals the first passage by compressing the seal 40, when the ball valve 100 is in the closed state, the amount of compression of the valve body 20 against the seal 40 is large, the mutual frictional force between the ball valve 100 and the seal 40 is also large, and the load of the motor required to rotate the ball valve 100 is also large.

Accordingly, referring to fig. 3 and 4, when the spool 20 is rotated to face the opening surface 22 with respect to the first passage, the first passage is communicated with the second passage 23. At this time, the opening 221 on the opening surface 22 is opposite to the first channel, and since the opening 221 is communicated with the second channel 23 inside the valve core 20, the first channel can be communicated through the second channel 23, so that the ball valve 100 assumes an open state, and fluid can be communicated with external equipment through the first channel and the second channel 23. When the ball valve 100 is in the open state relative to the closed state of the ball valve 100, since the distance L1 between the opening surface 22 and the rotation shaft 30 is smaller than the distance L2 between the closing surface 21 and the rotation shaft 30, the amount of compression of the seal 40 by the valve body 20 is small or not, and the load of the motor required to drive the ball valve 100 to rotate is small.

Compare whole ball structure in case 20 among the prior art, the embodiment of the utility model provides a through the structure that changes case 20, can be so that ball valve 100 under the state of difference (for example open or close), the compression of sealing member 40 changes to some extent, and not be in invariable high compression state always, and then can avoid the motor to be in high load state always. Therefore, the embodiment of the utility model provides a ball valve 100 can reduce the load of motor in the switch operation of ball valve 100, can avoid at ball valve 100's ooff valve in-process, and the motor is in under the high torque state for a long time to help prolonging the life of motor.

The second channel 23 can be understood as a cavity structure in the valve core 20. The cavity configuration depends on the configuration of the spool 20 and the design requirements below the second passage 23, which may be a circular passage, a square passage, or other irregularly shaped passage, etc. In the present embodiment, the structure of the second channel 23 is not further limited. For example, the opening 221 may be a circular opening or an opening with another shape, and in this embodiment, the structure of the opening 221 is not further limited.

As can be seen from fig. 1 to 4, the valve seat 10 may include a valve chamber 15, an inlet 13 and an outlet 14, and the inlet 13, the valve chamber 15 and the outlet 14 may be connected in sequence to form a first passage. The inlet 13 and outlet 14 may be oppositely disposed on the valve seat 10. That is, the gas inlet 13 and the gas outlet 14 may be provided at two opposite positions on the valve seat 10, such as the top and the bottom of the valve seat 10, so that the fluid can rapidly flow through the first passage, thereby reducing the flow resistance of the fluid in the first passage as much as possible. The valve core 20 may be disposed in the valve cavity 15, such that the valve core 20 may be rotated in the valve cavity 15 to facilitate the communication and sealing of the first passage, thereby achieving the function of the valve core 20 as an opening and closing member of the ball valve 100 to open or close the ball valve 100.

In order to facilitate the rotation of the valve core 20 in the valve cavity 15, the rotating shaft 30 may be disposed through the valve seat 10 and extend into the valve cavity 15 to connect with the valve core 20, so that the valve core 20 may be driven by the rotating shaft 30 to rotate correspondingly in the valve cavity 15 under the action of a driving device such as a motor.

It should be noted that, as shown in fig. 2 and fig. 4, the valve seat 10 may be provided with an assembly hole 16, so that the rotating shaft 30 may pass through the assembly hole 16 on the valve seat 10 and extend into the valve cavity 15 to be connected with the valve core 20. In order to prevent fluid such as gas from flowing through the gap between the shaft 30 and the mounting hole 16, the shaft 30 may be sealingly connected to the valve seat 10 by a first seal ring 50 or other sealing structure. The first sealing ring 50 may be embedded in the rotating shaft 30, or the first sealing ring 50 may be embedded in the assembly hole 16, or the first sealing ring 50 may be embedded in both the rotating shaft 30 and the assembly hole 16, so as to achieve the sealing connection between the rotating shaft 30 and the valve seat 10. In this embodiment, the position where the first seal ring 50 is disposed is not further limited.

Specifically, the valve seat 10 may include a valve frame 11 and a valve cover 12, and the valve cover 12 may cover a valve cavity 15 that is disposed on the valve frame 11 and encloses the valve seat 10 with the valve frame 11. To facilitate installation of the valve cartridge 20, the valve cover 12 may be detachably connected to the valve frame 11 by snapping, screwing, or other connection means. Accordingly, in order to prevent fluid such as gas from flowing from the assembly gap between the valve cover 12 and the valve frame 11, as a possible embodiment, the valve cover 12 may be sealingly connected to the valve seat 10 by a second sealing ring 60.

For example, the air inlet 13 may be disposed on the valve cover 12, and the air outlet 14 may be disposed on the bottom wall of the valve frame 11, so as to achieve the relative arrangement of the air inlet 13 and the air outlet 14 on the valve seat 10.

In order to better achieve the sealing of the blocking surface 21 with respect to the first passage, as a possible embodiment, a sealing element 40 may be provided in the valve chamber 15 and around the periphery of the air outlet 14. Because the air outlet 14 is located on the bottom wall of the valve frame 11, when the valve core 20 rotates to a position where the blocking surface 21 is opposite to the first passage (for example, the air outlet 14), the valve core 20 can abut against and compress the sealing member 40 through the blocking surface 21 under the action of gravity, and is in sealing connection with the inner wall of the valve cavity 15, so as to prevent the fluid from flowing to the outside of the ball valve 100 through the air outlet 14, and thus, better compression of the sealing member 40 can be achieved, and the sealing effect on the first passage can be ensured. Alternatively, the seal 40 may be located elsewhere in the valve chamber 15, such as at the inlet 13 or elsewhere in the valve chamber 15. In the present embodiment, the position where the seal member 40 is disposed is not further limited.

Illustratively, the sealing member 40 may be a sealing ring so as to be circumferentially surrounded by the sealing ring at the outlet port 14, thereby ensuring a sealing effect for the first passage when the blocking surface 21 abuts and compresses the sealing member 40.

Note that, since the blocking surface 21 seals the first passage on the peripheral side of the outlet port 14 by the seal member 40, when the fluid enters the valve chamber 15 through the inlet port 13, the amount of compression of the seal member 40 is further increased by the fluid.

It is to be understood that the illustrated structure of the embodiment of the present invention does not constitute a specific limitation to the ball valve 100. In other embodiments of the present application, the ball valve 100 may include more or fewer components than illustrated, or some components may be combined, some components may be separated, or a different arrangement of components.

The ball valve 100 of the present embodiment will be further described below by taking the sealing member 40 as an example, which is disposed around the gas outlet 14.

Fig. 5 is a perspective view of a valve element provided in an embodiment of the present invention, fig. 6 is a schematic structural diagram of a valve element provided in an embodiment of the present invention, and fig. 7 is a top view of the valve element in fig. 6.

As shown in fig. 5 to 7, the opening surface 22 may be an arc surface, so as to facilitate rotation of the valve core 20 in the first channel, and at the same time, to help reduce wear on the sealing member 40 when the valve core 20 rotates, thereby prolonging the service life of the ball valve 100.

As a possible embodiment, when the valve core 20 rotates, there is a clearance between the open face 22 and the seal 40. That is, since the sealing member 40 is disposed between the valve element 20 and the inner wall of the first passage and surrounds the periphery of the air outlet 14 at the bottom of the valve seat 10, when the valve element 20 is rotated until the opening 221 of the opening surface 22 is opposite to the first passage, such as the air outlet 14 (i.e., the ball valve 100 is in the open state), the opening surface 22 may have a gap with the sealing member 40, i.e., the opening surface 22 is not sealed with the bottom of the valve seat 10 (i.e., the inner wall of the valve chamber 15), so that the fluid can flow through the first passage and the second passage 23 to the outside of the valve seat 10, and simultaneously, the fluid can also flow through the gap between the opening surface 22 and the sealing member 40 to the. At this time, the ball valve 100 may not compress the sealing member 40 to reduce the compression amount of the sealing member 40 as much as possible, contributing to further reduction of the load of the motor, thereby further extending the service life of the motor and the service life of the sealing member 40.

Alternatively, when the valve core 20 is rotated until the opening 221 of the opening surface 22 is opposite to the first channel, such as the air outlet 14, the opening surface 22 may be sealingly connected to the inner wall of the first channel by the sealing member 40. Because the distance between the opening surface 22 and the center of the valve core 20 is smaller than the distance between the blocking surface 21 and the center of the valve core 20, at this time, compared with the closed state of the ball valve 100, the compression amount of the valve core 20 on the sealing member 40 is still smaller, so that during the switching operation of the ball valve 100, the load of the motor can be reduced, the motor is prevented from being in a high-torque state for a long time during the switching process of the ball valve 100, and the service life of the motor is prolonged. As shown in fig. 5 to 7, the blocking surface 21 may be located on a spherical surface with the center o1 of the rotating shaft 30 as a center. In this case, the closing surface 21 can be understood as a part of the entire sphere having the center o1 of the rotating shaft 30 as the center. As a possible embodiment, the plugging surface 21 may be a torus. When the valve core 20 rotates to the position where the blocking surface 21 is opposite to the first channel, such as the air outlet 14, on one hand, the blocking surface 21 can abut against and compress the sealing element 40 on the peripheral side of the air outlet 14, so that a better sealing effect on the first channel is realized, and on the other hand, the contact area between the blocking surface 21 and the sealing element 40 can be effectively reduced, so that the compression of the blocking surface 21 on the sealing element 40 is reduced, the load of the motor is reduced, and the service life of the motor is prolonged.

Alternatively, in this embodiment, the blocking surface 21 may also be a spherical surface on the spherical surface, and the top of the spherical surface may be an arc surface instead of a plane surface. In the present embodiment, the structure of the blocking surface 21 is not further limited.

The opening surface 22 may be a portion of a spherical surface, and the corresponding spherical center o2 of the opening surface 22 is located on a side of the center o1 of the rotation shaft 30 (as shown in fig. 6) facing away from the opening surface 22. This can contribute to achieving smooth connection of the edge of the opening face 22 and the edge of the closing face 21 while ensuring that the distance L1 between the opening face 22 and the center o1 of the rotation shaft 30 is smaller than the distance L2 between the closing face 21 and the rotation shaft 30o 1.

The radius R2 corresponding to the opening surface 22 may be larger than the radius R1 corresponding to the blocking surface 21. Thus, when the center o2 corresponding to the opening surface 22 is not concentric with the center (i.e. the center o1 of the rotating shaft 30) corresponding to the blocking surface 21, on one hand, the distance L1 between the opening surface 22 and the center o1 of the rotating shaft 30 is smaller than the distance L2 between the blocking surface 21 and the center o1 of the rotating shaft 30, so as to ensure that the compression amount of the sealing element 40 is greater than that of the opening state of the ball valve 100 in the closing state of the ball valve 100, which is beneficial to reducing the load of the motor and prolonging the service life of the motor in the switching operation of the ball valve 100; on the other hand, a smooth connection of the edge of the opening face 22 and the edge of the blocking face 21 is possible.

Specifically, the edge of the opening surface 22 and the edge of the closing surface 21 are smoothly connected, and the distance from the surface of the valve body 20 to the center o1 of the rotating shaft 30 gradually increases from the opening surface 22 to the closing surface 21. Therefore, the valve core 20 rotates in the first channel, so that in the process of the ball valve 100 from the open state to the closed state, the compression amount of the surface of the valve core 20 on the sealing member 40 can be gradually increased, namely when the ball valve 100 is in the closed state, the compression amount of the sealing member 40 reaches the maximum value, and when the ball valve 100 is in the open state, the compression amount of the sealing member 40 reaches the minimum value, so that in the switching operation of the ball valve 100, the load of the motor is reduced, the torque of the motor can be smoothly transited, and the service life of the motor is prolonged.

Furthermore, the difference h between the distance from the plugging surface 21 to the rotating shaft 30 and the distance from the rotating shaft 30 to the rotating shaft 30 ranges from 0.3mm to 0.5 mm. That is, the maximum amount of retraction of the opening surface 22 with respect to the closing surface 21 at the same position of the valve element 20 ranges from 0.3mm to 0.5 mm. This can contribute to achieving smooth connection of the edge of the opening face 22 and the edge of the closing face 21 while ensuring that the distance L1 between the opening face 22 and the center o1 of the rotation shaft 30 is smaller than the distance L2 between the closing face 21 and the center o1 of the rotation shaft 30.

Referring to fig. 6, when the central angle a corresponding to the opening surface 22 is smaller than 30 °, the opening surface 22 on the valve core 20 is relatively small, and the load reduction for the motor is small during the switching operation of the ball valve 100, which is not beneficial to prolonging the service life of the motor. Accordingly, when the central angle a corresponding to the opening surface 22 is greater than 90 °, the number of the blocking surfaces 21 on the valve core 20 is relatively small, which is not favorable for realizing the sealing of the first passage by the blocking surfaces 21. Thus, in order to achieve a smooth connection of the edge of the blocking surface 21 and the edge of the opening surface 22, the corresponding central angle a of the opening surface 22 may be between 30 ° and 90 °, for example 60 °.

Referring to fig. 5 to 7, two opening surfaces 22 are respectively disposed on two opposite sides of the valve core 20, and each opening surface 22 is provided with an opening 221, so that when the valve core 20 rotates to a position where the opening 221 on the opening surface 22 is opposite to a first channel (such as the air inlet 13 or the air outlet 14), communication between the second channel 23 and the first channel can be realized through the two openings 221, so as to facilitate fluid communication with the outside of the ball valve 100. The blocking surface 21 can be located between the two opening surfaces 22. This can reduce the rotation angle of the valve core 20 in the first passage, such as the valve chamber 15, during the process of opening the ball valve 100 to the closed state or from the closed state to the open state, so as to realize the opening or closing of the ball valve 100.

At present, the valve core 20 is usually made of a stainless steel material, which increases the cost of the valve core 20 and the ball valve 100, and on the other hand, after the opening 221 is machined in the valve core 20, the edge of the machined opening 221 is sharp, so that the sealing member 40 is easily worn by the valve core 20 in the rotating process, thereby reducing the sealing performance of the ball valve 100 in the closed state and affecting the service life of the sealing member 40 and the ball valve 100.

Therefore, in the embodiment of the present invention, the valve core 20 may be a plastic part, so as to reduce the cost of the valve core 20 and the ball valve 100 compared to the stainless steel material. The plastic part can be made of Polyformaldehyde (POM) thermoplastic crystalline polymer or plastic material with better strength and wear resistance. That is, in the present embodiment, the material for preparing the valve element 20 includes, but is not limited to, POM.

Further, the edges of the opening 221 have rounded corners. This may reduce wear of the valve spool 20 against the seal 40 during rotation of the valve spool 20 within the first passage. Illustratively, the radius of the rounded corners may be 0.5 mm.

Specifically, the valve body 20 has a mounting surface 24 at a position corresponding to an end of the rotating shaft 30, the mounting surface 24 has a mounting hole 241 matching and connecting with the rotating shaft 30, and the mounting hole 241 is located between the two openings 221. The rotating shaft 30 can be installed between the two openings 221 of the valve core 20 through the installation hole 241, so that the opening surface 22 and the blocking surface 21 on the circumferential direction of the rotating shaft 30 can rotate in the direction perpendicular to the axis of the rotating shaft 30 under the driving of the rotating shaft 30, so that the ball valve 100 can assume an open state or a closed state.

Referring to fig. 5 and 6, the mounting hole 241 may be a non-circular hole, such as a square hole, a hole with a triangular cross section, a strip-shaped hole, or other mounting hole 241 structure. This ensures that the spool 20 can rotate synchronously with the shaft 30 without misalignment, which facilitates better control of the shaft 30 of the spool 20.

The mounting hole 241 may be a blind hole or a groove recessed toward the center of the valve element 20 on the mounting surface 24. The rotation shaft 30 is installed in the installation hole 241 and is key-coupled with the installation hole 241.

The mounting surface 24 may be considered a planar structure on the valve element 20. The mounting surface 24 may be a surface having the same spherical structure as the opening surface 22, or the mounting surface 24 may be a surface having the same spherical structure as the blocking surface 21. In the present embodiment, the structure of the surface on which the mounting surface 24 is located is not further limited.

Further, the valve core 20 may further include a limiting protrusion 25, the limiting protrusion 25 may be disposed opposite to the mounting hole 241, the inner sidewall of the first passage, such as the valve cavity 15, is provided with a limiting hole 17, and the limiting protrusion 25 is rotatably assembled in the limiting hole 17. Thus, the valve core 20 can be fitted in the first passage through the stopper projection 25 and the installation position and the rotational direction of the valve core 20 are restricted through the stopper hole 17.

The limiting hole 17 may be a blind hole matched with the limiting protrusion 25 to ensure the sealing performance and strength of the valve seat 10.

For example, when the ball valve 100 is in the open state, the blocking surface 21 is in a position opposite to the gas outlet 14 of the first passage, and at this time, the blocking surface 21 seals the first passage by the sealing member 40, so that fluid such as gas cannot flow through the gas outlet 14 from the outside of the ball valve 100, and the compression amount of the sealing member 40 reaches a maximum value by the cooperation of the valve element 20 and the fluid. When the valve core 20 needs to be rotated to enable the ball valve 100 to be in the valve opening state, the valve core 20 can be installed in the installation hole 241 of the valve core 20 through the rotating shaft 30, at this time, the limiting protrusion 25 is assembled in the limiting hole 17, under the driving of the motor, the rotating shaft 30 can drive the valve core 20 to rotate on the axis perpendicular to the rotating shaft 30 or the limiting protrusion 25 by a preset angle, for example, 90 °, so that the opening 221 on the opening surface 22 is opposite to the air outlet 14 of the first channel, the ball valve 100 is in the valve opening state, and at this time, the compression amount of the sealing element 40.

The utility model discloses a case is in the not equidirectional setting of shutoff face and opening face of pivot week, and the distance between opening face and the pivot is less than the distance of shutoff face and pivot, can make the compression volume at ball valve ooff valve in-process sealing member be the variation value like this, and the non-high compression state that is in invariable always, and then also can avoid the motor to be in high load state always, can effectively reduce the load of ooff valve in-process motor, help prolonging the life of motor.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (16)

1. A ball valve is characterized by comprising a valve seat, a valve core, a rotating shaft and a sealing element, wherein the valve seat is provided with a first channel, the valve core is rotatably arranged in the first channel through the rotating shaft, and the sealing element is arranged between the valve core and the inner wall of the first channel; the valve core is internally provided with a second channel for fluid to flow through, the valve core is respectively provided with a plugging surface and an opening surface in different directions of the circumferential direction of the rotating shaft, the sealing element is arranged in the valve seat, the plugging surface is used for being abutted against the sealing element to seal the first channel, and the plugging surface is an arc surface; the opening surface is used for communicating the first channel and the second channel when being opposite to the first channel; the distance L1 between the opening surface and the rotating shaft is smaller than the distance L2 between the blocking surface and the rotating shaft.

2. The ball valve of claim 1, wherein when the spool is rotated to a position where the blocking surface opposes the first passage, the blocking surface abuts against the seal and seals the first passage with the seal; when the valve core rotates to the position that the opening surface is opposite to the first channel, the first channel is communicated with the second channel.

3. The ball valve of claim 1, wherein the open face has an opening for communicating the first and second passages.

4. The ball valve of claim 1, wherein the valve seat includes a valve cavity, a gas inlet, and a gas outlet, the gas inlet, the valve cavity, and the gas outlet are sequentially connected to form the first passage, the gas inlet and the gas outlet are oppositely disposed on the valve seat, and the valve core is disposed in the valve cavity.

5. The ball valve according to claim 4, wherein the sealing member is provided in the valve chamber and surrounds a peripheral side of the outlet port.

6. The ball valve of claim 1, wherein the opening surface is an arcuate surface.

7. The ball valve of claim 6, wherein the sealing surface is located on a spherical surface centered on the center of the axis of rotation.

8. The ball valve of claim 7, wherein the blocking surface is a torus.

9. The ball valve according to any one of claims 1 to 8, wherein the opening surface is a portion of a spherical surface, and a corresponding spherical center of the opening surface is located on a side of the center of the rotation shaft facing away from the opening surface.

10. The ball valve of claim 9, wherein the opening surface is on a spherical surface having a radius greater than a radius corresponding to a spherical surface on which the obturating surface is on.

11. The ball valve according to claim 10, wherein an edge of the opening surface is smoothly connected with an edge of the blocking surface, and a distance from the surface of the spool to the rotation axis is gradually increased from the opening surface to the blocking surface.

12. The ball valve of claim 11, wherein the difference between the distance from the sealing surface to the axis of rotation and the distance from the opening surface to the axis of rotation is in the range of 0.3mm to 0.5 mm.

13. The ball valve of claim 9, wherein the open face corresponds to a central angle between 30 ° and 90 °.

14. The ball valve according to any of claims 3-8, wherein the opening edge has a rounded corner.

15. The ball valve according to any one of claims 1 to 8, wherein the valve body has a mounting surface at a position corresponding to an end of the rotary shaft, and the mounting surface has a mounting hole for mating connection with the rotary shaft.

16. The ball valve according to claim 15, wherein the valve core further comprises a limiting protrusion, the limiting protrusion is disposed opposite to the mounting hole, the inner sidewall of the first passage has a limiting hole, and the limiting protrusion is rotatably assembled in the limiting hole.

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