Double floating bidirectional self-sealing rotary ball valve

Abstract

The application discloses a double-floating bidirectional self-sealing rotary ball valve, which comprises a valve body provided with a main channel for liquid medium circulation, a positioning step extending towards the center being arranged at one end of the main channel, a floating valve seat installed at one end of the main channel and capable of sliding along the central axis direction of the main channel, a valve plate movably installed in the main channel, the valve plate being capable of being in sealing connection with the floating valve seat to cut off the circulation of the liquid medium in the main channel, and a piston ring arranged between the positioning step and the floating valve seat and connected with the floating valve seat through elastic members. The double-floating bidirectional self-sealing rotary ball valve has the advantages of convenient bidirectional opening and closing, good sealing performance, few structural components, simple processing, convenient assembly, suitability for batch production and extremely high economic and social benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline control valves, in particular to a double-floating bidirectional self-sealing rotary ball valve. BACKGROUND

[0002] Compared with the traditional butterfly valve, the rotary ball valve combines the floating valve seat technology of the ball valve, so that the butterfly structure rotary ball valve has bidirectional hard sealing performance. In actual application, when the valve is in a closed state and bears the medium pressure from the valve seat end to the valve shaft end, the valve shaft and the valve plate will be displaced away from the floating valve seat due to the assembly tolerance and elastic deformation under stress, and the floating valve seat will also be displaced to tightly contact the valve plate under the medium pressure, so that the floating valve seat and the valve plate are always in contact and sealing, and the sealing force is only the thrust of the floating valve seat ring surface under the hydraulic action, the ring surface area is small, the local stress of the sealing pair is small, the valve is sealed, and the opening and closing torque is low, and the valve is easily opened and closed. When the valve bears the medium pressure from the valve shaft end to the valve seat end, the valve shaft and the valve plate will also be pressed tightly on the floating valve seat due to the assembly gap and elastic deformation under stress, and the prior art does not provide elastic space in this direction, so that the valve has large opening and closing torque in this flow direction, the stress is concentrated at the sealing contact, and the sealing surface is also easily worn, which affects the service life of the valve. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a double-floating bidirectional self-sealing rotary ball valve, which has the advantages of bidirectional opening and closing, good sealing performance, fewer structural components, simple processing, easy assembly, and suitability for mass production.

[0004] According to the double-floating bidirectional self-sealing rotary ball valve of the present application, the valve body is provided with a main channel for the flow of liquid medium, one end of the main channel is provided with a positioning step extending towards the center, the floating valve seat is installed at one end of the main channel and can slide along the central axis direction of the main channel, the valve plate is movably installed in the main channel, the valve plate can be sealingly connected with the floating valve seat to cut off the flow of liquid medium in the main channel, and the piston ring is arranged between the positioning step and the floating valve seat and connected with the floating valve seat through the elastic member.

[0005] According to the double-floating bidirectional self-sealing rotary ball valve of the present application, at least the following advantages are achieved:

[0006] The floating valve seat and the piston ring connected with the floating valve seat through the elastic member make the valve plate rotate easily and seal well when the valve plate is subjected to bidirectional thrust, so that the valve is opened and closed easily, the friction between the floating valve seat and the sealing surface of the valve plate is reduced, the opening and closing torque of the valve plate is reduced, and the service life of the floating valve seat and the valve plate is prolonged; only the floating valve seat and the piston ring are added to the existing valve, the structure is simple, the components are few, the manufacturing cost is low, batch production is facilitated, and high economic and social benefits are obtained.

[0007] According to some embodiments of the present application, the valve body comprises an extension protruding towards one side, and the main channel passes through the extension; the floating valve seat and the piston ring are both installed in the extension.

[0008] According to some embodiments of the present application, one end of the floating valve seat towards the valve plate is provided with a sealing surface capable of sealingly connecting with the valve plate.

[0009] According to some embodiments of the present application, the other end of the floating valve seat away from the valve plate is provided with a limiting ring, the inner ring of the piston ring is sealingly connected with the limiting ring, and the outer ring of the piston ring is sealingly connected with the inner side wall of the main channel.

[0010] According to some embodiments of the present application, an inner sealing ring is arranged between the inner ring of the piston ring and the limiting ring, and an outer sealing ring is arranged between the outer ring of the piston ring and the inner side wall of the main channel.

[0011] According to some embodiments of the present application, the elastic member is a power spring, one end of the power spring penetrates into the floating valve seat, and the other end of the power spring is connected with one end of the piston ring away from the positioning step.

[0012] According to some embodiments of the present application, when the floating valve seat is not in contact with the valve plate, a gap is formed between the piston ring and the floating valve seat; and a flow guide groove is arranged on the outer peripheral wall of the floating valve seat to connect the gap and the main channel.

[0013] According to some embodiments of the present application, the valve body is provided with a valve shaft rotating around the axis thereof, the valve shaft is connected in transmission with the valve plate, and the rotation of the valve shaft can drive the valve plate to rotate.

[0014] According to some embodiments of the present application, the axis extension direction of the valve shaft is perpendicular to the axis extension direction of the main channel.

[0015] According to some embodiments of the present application, the valve shaft comprises an upper valve shaft and a lower valve shaft, the valve body comprises an upper shaft hole and a lower shaft hole, the upper valve shaft is arranged in the upper shaft hole, and the lower valve shaft is arranged in the lower shaft hole.

[0016] Additional aspects and advantages of the present application will be partially given in the following description, partially will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described below in connection with the drawings and examples, in which:

[0018] Figure 1 Structure schematic diagram of one embodiment of the present application under right side medium pressure;

[0019] Figure 2 Structure schematic diagram of one embodiment of the present application under left side medium pressure; Figure 1 Enlarged view of A in the middle;

[0020] Figure 3 Structure schematic diagram of one embodiment of the present application under left side medium pressure;

[0021] Figure 4 Structure schematic diagram of one embodiment of the present application under left side medium pressure; Figure 3 Enlarged view of B in the middle;

[0022] Figure 5 Structure schematic diagram of one embodiment of the present application under left side medium pressure;

[0023] Figure 6 Structure schematic diagram of one embodiment of the present application under left side medium pressure; Figure 5 Enlarged view of C in the middle.

[0024] LIST OF FIGURES

[0025] Valve body 100, main channel 110, positioning step 120, extension section 130, valve shaft 140, upper valve shaft 141, lower valve shaft 142, upper shaft hole 150, sealing shaft sleeve 151, lower shaft hole 160, positioning ring 161, end cover 162, limiting block 170;

[0026] Floating valve seat 200, sealing surface 210, limiting ring 220, flow guide groove 230;

[0027] Valve plate 300;

[0028] Piston ring 400, inner sealing ring 410, outer sealing ring 420;

[0029] Elastic member 500. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be understood that the orientation description, such as the upper, lower, etc. The orientation or positional relationship shown in the figure is based on the orientation or positional relationship shown in the figure, only for the purpose of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application.

[0032] In the description of the present application, more than two refers to more than two. If there is a description of the first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. Should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0034] Referring to Figures 1 to 6 , one embodiment of the present application is a double floating bidirectional self-sealing rotary ball valve, comprising a valve body 100, a floating valve seat 200, a piston ring 400 and a valve plate 300 installed in the valve body 100, a valve shaft 140.

[0035] The valve body 100 is provided with a main channel 110 for liquid medium flow, and the main channel 110 is provided with a positioning step 120 extending towards the center. The floating valve seat 200 is installed at one end of the main channel 110 and can slide along the center axis direction of the main channel 110; the piston ring 400 is arranged between the positioning step 120 and the floating valve seat 200, and is connected with the floating valve seat 200 through the elastic element 500.

[0036] Further, referring to Figure 1 , the valve plate 300 is movably installed in the main channel 110 and can be sealingly connected with the floating valve seat 200 to cut off the flow of liquid medium in the main channel 110. The main channel 110 is horizontally arranged, and the valve shaft 140 is vertically arranged in the valve body 100 and is connected with the valve plate 300 in transmission; that is, the axis extension direction of the valve shaft 140 is perpendicular to the axis extension direction of the main channel 110. The valve shaft 140 is rotatably arranged in the valve body 100 around its own axis.

[0037] In some embodiments of the present invention, the valve shaft 140 includes an upper valve shaft 141 and a lower valve shaft 142. The valve body 100 includes an upper shaft hole 150 and a lower shaft hole 160. The upper valve shaft 141 is disposed within the upper shaft hole 150, and the lower valve shaft 142 is disposed within the lower shaft hole 160. The bottom of the upper valve shaft 141 penetrates into the main channel 110 and is connected to the valve plate 300. The top of the upper valve shaft 141 is connected to a device that drives its rotation, such as a handle or a motor. The top of the lower valve shaft 142 penetrates into the main channel 110 and is connected to the valve plate 300. The bottom of the lower valve shaft 142 is installed in the lower shaft hole 160.

[0038] Reference Figure 1 、 Figure 3 As shown, a sealing sleeve 151 is installed in the upper shaft hole 150 to prevent the liquid medium in the main channel 110 from flowing out of the upper shaft hole 150. Since the bottom of the lower valve shaft 142 does not pass through the lower shaft hole 160, a positioning ring 161 and an end cap 162 are provided at the bottom of the lower shaft hole 160. The positioning ring 161 is used to limit the axial sliding of the lower valve shaft 142, and the end cap 162 is used to seal the lower shaft hole 160 to prevent the liquid medium in the main channel 110 from flowing out of the lower shaft hole 160. The positioning ring 161 can be a structure such as a retaining spring, and the sealing sleeve 151 can be a structure such as a mechanical seal.

[0039] In some embodiments of the present invention, the valve body 100 includes an extension section 130 protruding toward one side, and the main channel 110 passes through the extension section 130; the floating valve seat 200 and the piston ring 400 are both installed in the extension section 130. For ease of expression, the left side and the right side are artificially defined in this application. Figure 1 、 Figure 3 As shown, the extension section 130 extends to the left, and the floating valve seat 200 and piston ring 400 are also primarily mounted on the left side of the valve plate 300. A positioning step 120 is provided at the left end of the valve body 100, extending toward the center of the main passage 110. It serves to limit the sliding end position of the floating valve seat 200 and piston ring 400. The positioning step 120 and the floating valve seat 200 are used to limit the left and right positions of the piston ring 400.

[0040] In a further embodiment of the present invention, the right end of the extension section 130 is connected to a limit block 170, which cooperates with the positioning step 120 to prevent the floating valve seat 200 from sliding toward the right when the ball valve is opened, that is, after the valve plate 300 is disengaged from the floating valve seat 200, and to prevent the floating valve seat 200 from being displaced too much under the action of the medium.

[0041] It should be understood that, since the positioning step 120 is fixedly arranged on the valve body 100, the limiting block 170 is detachably connected with the valve body 100, so as to facilitate the installation of the floating valve seat 200. During the installation, the piston ring 400 and the floating valve seat 200 should be installed from the right side of the main channel 110, and then the limiting block 170 is installed.

[0042] In some embodiments of the present application, the floating valve seat 200 is provided with a sealing surface 210 at one end thereof which is directed towards the valve plate 300, and the sealing surface 210 is capable of being sealingly connected with the valve plate 300. As shown in Figure 2 、 Figure 4 , the sealing surface 210 is a bevel surface which is capable of being sealingly connected with the edge of the valve plate 300, so as to cut off the flow of the liquid medium in the main channel 110.

[0043] It can be conceived that the sealing surface 210 can be subjected to special process treatment or additional use of wear-resistant material, so as to prolong the service life thereof.

[0044] In some embodiments of the present application, the floating valve seat 200 is provided with a limiting ring 220 at one end thereof which is directed away from the valve plate 300, and the inner ring of the piston ring 400 is sealingly connected with the limiting ring 220, and the outer ring of the piston ring 400 is sealingly connected with the inner side wall of the main channel 110. Specifically, the floating valve seat 200 and the piston ring 400 are both annular. An inner sealing ring 410 is arranged between the inner ring of the piston ring 400 and the limiting ring 220, and an outer sealing ring 420 is arranged between the outer ring of the piston ring 400 and the inner side wall of the main channel 110. The arrangement of the inner sealing ring 410 and the outer sealing ring 420 can not only ensure that the liquid medium in the main channel 110 cannot flow out through the connecting portion between the piston ring 400 and the inner side wall of the main channel 110, but also ensure that the liquid medium in the main channel 110 cannot flow out through the connecting portion between the piston ring 400 and the limiting ring 220, but the piston ring 400 can still slide leftward and rightward within a certain range.

[0045] Both the inner sealing ring 410 and the outer sealing ring 420 are O-rings.

[0046] In some embodiments of the present application, the elastic member 500 is a booster spring, one end of the booster spring is inserted into the floating valve seat 200, and the other end of the booster spring abuts against one end of the piston ring 400 which is directed away from the positioning step 120. As shown in Figure 2 、 Figure 4 , the surface of the floating valve seat 200 which is directed towards the positioning step 120 is provided with a hole for embedding the booster spring, and one end of the booster spring is embedded in the hole; the other end of the booster spring abuts against one end of the piston ring 400 which is directed away from the positioning step 120.

[0047] It should be noted that when the floating valve seat 200 is not in contact with the valve plate 300, a gap exists between the piston ring 400 and the floating valve seat 200. At this time, the piston ring 400 contacts the positioning step 120, and the floating valve seat 200 may contact the stop block 170. A guide groove 230 is provided on the outer peripheral wall of the floating valve seat 200 to connect the gap with the main channel 110; that is, the liquid medium in the main channel 110 can enter the gap between the piston ring 400 and the floating valve seat 200 through the guide groove 230.

[0048] The working principle of the double-floating, two-way self-sealing rotary ball valve of the embodiment of the present invention is as follows:

[0049] 1. Reference Figure 1 、 Figure 2 As shown, when the valve plate 300 is subjected to medium pressure from right to left, the valve plate 300 and valve shaft 140 elastically deform to the left under the thrust of the medium, and the left side of the piston ring 400 abuts against the positioning step 120. At this time, the sealing contact ring between the valve plate 300 and the floating valve seat 200 is M1. Stretching leftward along M1 forms the sealing interface L1. Since there is a gap between the floating valve seat 200 and the piston ring 400, and the liquid medium in the main channel 110 can enter the gap through the guide groove 230, it can be understood that: the left and right ends of the floating valve seat 200 on the outside of the sealing interface L1 (the side away from the central axis of the main channel 110) are subjected to medium pressures of opposite directions and equal in magnitude, and offset each other, while the floating valve seat 200 on the inside of the sealing interface L1 (the side close to the central axis of the main channel 110) is only subjected to medium pressure from the left side to the right. At the same time, due to the presence of the elastic member 500, the contact position of the floating valve seat 200 and the valve plate 300 can achieve good sealing; by controlling the thrust of the elastic member 500 and the inner area of ​​L1, it is possible to minimize the contact force between the floating valve seat 200 and the valve plate 300 while ensuring the sealing performance, so that the valve plate 300 can be easily rotated.

[0050] 2. Reference Figure 3 、 Figure 4As shown, when the valve plate 300 is subjected to the medium pressure from left to right, the valve plate 300 and the valve shaft 140 will be elastically deformed to the right under the medium thrust, and the floating valve seat 200 will also keep the sealing contact with the valve plate 300 under the medium pressure from left to right. At this time, the sealing contact ring of the valve plate 300 and the floating valve seat 200 is the M2 ring, which is stretched to the left side along M2, and then the sealing interface L2 is obtained. When subjected to the medium pressure from left to right, the piston ring 400 will be pushed against the left side of the floating valve seat 200 by the medium pressure, at which time the piston ring 400 and the floating valve seat 200 can be regarded as a whole. The left and right ends of the floating valve seat 200 on the inside of the sealing interface L2 (the side close to the central axis of the main channel 110) can be understood as being subjected to the medium pressure in opposite directions and of equal size, and canceling each other, and the floating valve seat 200 on the outside of the sealing interface L2 (the side away from the central axis of the main channel 110) is only subjected to the medium pressure from left to right, so as to push the floating valve seat 200 to keep the sealing contact with the valve plate 300. At this time, since there is a gap between the piston ring 400 and the positioning step 120, the contact force between the floating valve seat 200 and the valve plate 300 can be minimized by controlling the area on the outside of L2 while ensuring the sealing performance, at which time the valve plate 300 can also be easily rotated, so that the double-floating bidirectional self-sealing rotary ball valve of the application can be easily opened when subjected to the medium pressure in different directions.

[0051] In the double-floating bidirectional self-sealing rotary ball valve of another embodiment of the application, as shown in Figure 5 、 Figure 6 The positioning step 120 in the embodiment is detachably connected with the valve body 100, and the limiting block 170 is fixedly arranged in the main channel 110 of the valve body 100. The piston ring 400 and the floating valve seat 200 in the embodiment should be installed from the left side of the main channel 110, and then the positioning step 120 is installed. The working principle of the embodiment is consistent with the above-described embodiment, but compared with the above-described embodiment, the installation method of the piston ring 400 and the floating valve seat 200 in the embodiment is more convenient.

[0052] The double-floating bidirectional self-sealing rotary ball valve according to the embodiment of the present application, by virtue of the floating valve seat 200 slidingly installed in the main channel 110 and the piston ring 400 connected with the floating valve seat 200 through the elastic member 500, enables the valve plate 300 to rotate easily under the condition of good sealing when subjected to bidirectional thrust, thereby achieving easy opening and closing of the valve, effectively reducing the friction between the floating valve seat 200 and the sealing surface 210 of the valve plate 300, reducing the opening and closing torque of the valve plate 300 and prolonging the service life of the floating valve seat 200 and the valve plate 300; only the floating valve seat 200 and the piston ring 400 are added to the existing valve, the structure is simple, the components are few, the manufacturing cost is low, mass production is facilitated, and the economic and social benefits are extremely high.

[0053] The above detailed description of the embodiments of the present application is made in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A double floating bidirectional self-sealing rotary ball valve, characterized in that: include: The valve body (100) is provided with a main channel (110) for the circulation of a liquid medium, and one end of the main channel (110) is provided with a positioning step (120) extending toward the center; a floating valve seat (200) mounted at one end of the main channel (110) and capable of sliding along the central axis of the main channel (110); a valve plate (300) movably mounted in the main channel (110); the valve plate (300) can be sealedly connected to the floating valve seat (200) to cut off the flow of the liquid medium in the main channel (110); A piston ring (400) is slidably mounted between the positioning step (120) and the floating valve seat (200), and is connected to the floating valve seat (200) via an elastic member (500); The floating valve seat (200) is provided with a limit ring (220) at one end facing away from the valve plate (300), the inner ring of the piston ring (400) is sealed with the limit ring (220), and the outer ring of the piston ring (400) is sealed with the inner wall of the main channel (110); when the floating valve seat (200) is not in contact with the valve plate (300), there is a gap between the piston ring (400) and the floating valve seat (200); the outer peripheral wall of the floating valve seat (200) is provided with a guide groove (230) to connect the gap with the main channel (110).

2. A double-floating, two-way self-sealing rotary ball valve according to claim 1, characterized in that: The valve body (100) comprises an extension section (130) protruding toward one side, and the main channel (110) passes through the extension section (130); the floating valve seat (200) and the piston ring (400) are both installed in the extension section (130).

3. The double-floating, two-way self-sealing rotary ball valve according to claim 1, characterized in that: A sealing surface (210) is provided at one end of the floating valve seat (200) facing the valve plate (300), and the sealing surface (210) can be sealed and connected to the valve plate (300).

4. A double-floating, two-way self-sealing rotary ball valve according to claim 1, characterized in that: An inner sealing ring (410) is provided between the inner ring of the piston ring (400) and the limiting ring (220), and an outer sealing ring (420) is provided between the outer ring of the piston ring (400) and the inner side wall of the main channel (110).

5. The double-floating, two-way self-sealing rotary ball valve according to claim 1, characterized in that: The elastic member (500) is a booster spring, one end of which penetrates into the floating valve seat (200), and the other end of which is connected to the end of the piston ring (400) away from the positioning step (120).

6. The double-floating, two-way self-sealing rotary ball valve according to claim 1, characterized in that: The valve body (100) is provided with a valve shaft (140) that rotates around its own axis. The valve shaft (140) is transmission-connected to the valve plate (300). The rotation of the valve shaft (140) can drive the valve plate (300) to rotate.

7. A double-floating, two-way self-sealing rotary ball valve according to claim 6, characterized in that: The axial extension direction of the valve shaft (140) is perpendicular to the axial extension direction of the main channel (110).

8. A double-floating, two-way self-sealing rotary ball valve according to claim 6 or 7, characterized in that: The valve shaft (140) includes an upper valve shaft (141) and a lower valve shaft (142), and the valve body (100) includes an upper shaft hole (150) and a lower shaft hole (160), wherein the upper valve shaft (141) is inserted into the upper shaft hole (150), and the lower valve shaft (142) is inserted into the lower shaft hole (160).

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