Sealed valve

Abstract

The present invention discloses a sealing valve, which comprises a valve body and a valve plate. The valve body includes a fluid passage port and a sealing surface surrounding the same. The valve plate can move relative to the valve body between an open position and a closed position of the fluid passage port. In the closed position of the fluid passage port, the valve plate realizes sealing by means of the cooperation between the side surface and the sealing surface of the valve body, thereby cutting off the fluid passage. The sealing valve further includes an annular expansion bladder, which is arranged on the valve body corresponding to the sealing surface of the valve body, or is arranged on the valve plate at a position corresponding to a part of the valve body sealing surface when the valve plate is in the closed position of the fluid passage port. When the valve plate is in the closed position of the fluid passage port, the expansion bladder is located between the side surface of the valve plate and the sealing surface of the valve body and can be filled with and discharged of fluid to control the pressure between the expansion bladder and the side surface of the valve plate and the sealing surface of the valve body. The sealing valve of the present invention can avoid the wear caused by direct mechanical extrusion between the sealing surfaces of the valve plate and the valve body while realizing closing and opening, reduce the requirement for the machining accuracy of the sealing surface and reduce the machining cost.

Description

Technical Field

[0001] The present invention relates to the petrochemical field, and particularly to an improved sealing valve for the petrochemical field. Background Art

[0002] In industrial production processes such as chemical engineering, oil refining, metallurgy, and electric power, there are low-pressure medium pipelines such as flue gas pipelines and ventilation pipelines. These pipelines are used to input or discharge low-pressure media such as high-temperature flue gas and air, so as to cooperate with the production process.

[0003] In order to open and close these pipelines, metal sealing valves suitable for high temperatures are often provided in the pipelines, including valve bodies and valve plates. By pressing the sealing surface of the valve plate against the sealing surface of the valve body, an elastic force is generated therebetween to reach a certain sealing specific pressure to ensure the sealing of the sealing valve. Therefore, the precision requirements for the sealing surfaces of the valve body and the valve plate are very high, and the processing is complex and the cost is high. Otherwise, it is difficult to ensure the sealing performance. At the same time, in the prior art, during the repeated opening and closing process of the sealing valve, the sealing surfaces of the valve plate and the valve body are repeatedly rubbed and pressed, which is prone to mechanical wear and causes the sealing performance between the two sealing surfaces to decline.

[0004] Therefore, an improved sealing valve is needed to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to at least partially overcome the deficiencies in the prior art by providing a sealing member.

[0006] According to the present invention, there is provided a sealing valve, comprising:

[0007] A valve body, including a valve body main body that defines a fluid passage; and a sealing surface and a fluid passage port provided in a cross-section of the valve body main body that can cut off the fluid passage, the sealing surface being disposed around the fluid passage port; and

[0008] A valve plate that can move relative to the valve body between a position of opening the fluid passage port and a position of closing the fluid passage port, and in the position of closing the fluid passage port, the valve plate cooperates with the sealing surface of the valve body through its side surface to achieve sealing, thereby cutting off the fluid passage,

[0009] Wherein, the sealing valve further includes an annular expansion bladder, which is provided on the valve body corresponding to the sealing surface, or provided on a part of the valve plate corresponding to the sealing surface when the valve plate is in the position of closing the fluid passage port. When the valve plate is in the position of closing the fluid passage port, the expansion bladder is located between the side surface of the valve plate and the sealing surface of the valve body, and the expansion bladder can be filled with and discharged of fluid to control the pressure between the expansion bladder and the side surface of the valve plate and the sealing surface of the valve body.

[0010] Preferably, the expansion bladder is controlled to be filled with fluid after the valve plate moves to the position of closing the fluid passage opening when it is necessary to close the fluid passage opening, so as to enhance the pressure between the expansion bladder and the valve plate and the valve body and form a seal, and before the valve plate is about to leave the position of closing the fluid passage opening, the fluid is discharged to reduce the pressure between the expansion bladder and the valve plate and release the seal.

[0011] Preferably, the sealing valve further includes a spring piece, which is arranged on the inner peripheral side and / or the outer peripheral side of the annular shape of the expansion bladder relative to the radial direction to protect the expansion bladder when fluid passes through during use.

[0012] Preferably, the cross-sectional shape of the spring piece along the radial direction of the expansion bladder is a bent shape that extends from the fixed surface of the expansion bladder and can protect the expansion bladder in the radial direction.

[0013] Preferably, the spring piece is made of non-metal or metal.

[0014] Preferably, the valve plate translates between the position of opening the fluid passage opening and the position of closing the fluid passage opening parallel to the sealing surface of the valve body. The expansion bladder is arranged on the valve body, and the spring piece is arranged on the inner peripheral side of the annular shape of the expansion bladder relative to the radial direction.

[0015] Preferably, the spring piece abuts against or contacts the valve plate when the valve plate translates to guide the movement of the valve plate.

[0016] Preferably, the valve body includes sealing surfaces arranged in two cross-sections parallel to each other, and the sealing surfaces in the two cross-sections are respectively located on both sides of the valve plate.

[0017] Preferably, expansion bladders are arranged on the sealing surfaces of both cross-sections, or among the sealing surfaces in the two cross-sections, an expansion bladder is arranged on the sealing surface in one cross-section, and a valve seat is arranged in the other cross-section. The valve seat abuts against the valve plate to form a seal when the valve plate is in the position of closing the fluid passage opening.

[0018] Preferably, the valve seat is a metal or non-metal gasket.

[0019] Preferably, the main body of the valve body is a pipe with an annular cross-section. The valve body further includes an annular recess extending radially outward from the annular cross-section pipe, and the two side surfaces of the annular recess parallel to the radial direction define the sealing surfaces in two parallel cross-sections.

[0020] Preferably, the expansion bladder is made of an elastic material or a metal foil.

[0021] Preferably, the sealing valve further includes a fluid charging and discharging device, which is in fluid communication with the expansion bladder through a fluid medium hose and is used to fill the expansion bladder with fluid or discharge the fluid from the expansion bladder via the fluid medium hose.

[0022] Preferably, the fluid medium hose is a metal hose or a rubber hose.

[0023] Preferably, the sealing valve further includes a valve plate driving mechanism cavity, a valve plate driving device, and a connecting device connecting the valve plate driving device and the valve plate. The valve plate driving mechanism cavity extends outward from the valve body main body along the moving track of the valve plate to accommodate the movement of the valve plate therein. A part of the connecting device extends into the valve plate driving mechanism cavity in a sealed manner from the outside and is connected to the valve plate, and can be driven by the valve plate driving device to enter and exit the valve plate driving mechanism cavity. Thus, when it is necessary to close the fluid passage opening in the non-sealed state between the valve plate and the valve body, the connecting device is driven into the valve plate driving mechanism cavity, so as to move the valve plate from the position of opening the fluid passage opening to the position of closing the fluid passage opening. And when it is necessary to open the fluid passage opening in the sealed state between the valve plate and the valve body, the connecting device is driven to move outward from the valve plate driving mechanism cavity, so as to move the valve plate away from the position of closing the fluid passage opening to open the fluid passage opening.

[0024] The sealing valve according to the present invention controls the pressure between the annular expansion bladder and the side surface of the valve plate and the sealing surface of the valve body by filling and discharging fluid into the annular expansion bladder provided between the side surface of the valve plate and the sealing surface of the valve body, thereby realizing the closing and opening of the sealing valve, while avoiding the wear caused by the direct mechanical extrusion between the sealing surface of the valve plate and the valve body, reducing the requirement for the machining accuracy of the sealing surface, and reducing the machining cost. Description of the Drawings

[0025] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent:

[0026] Figure 1 is a front view of a sealing valve in a closed state according to an embodiment of the present invention;

[0027] Figure 2 is Figure 1 a partial cross-sectional side view of the sealing valve shown in

[0028] Figure 3 is along Figure 1 a cross-sectional view taken along section A-A shown in

[0029] Figure 4 is Figure 1 a front view of the sealing valve in an open state according to the embodiment shown in

[0030] Figure 5 is a front view of a sealing valve in a closed state according to another embodiment of the present invention. Detailed Embodiments

[0031] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for ease of description, only the parts related to the invention are shown in the drawings.

[0032] The sealing valve of the present invention includes a valve body and a valve plate. The valve body includes a valve body main body that defines a fluid passage, and a sealing surface and a fluid passage port provided in a cross-section of the valve body main body that can cut off the fluid passage. The sealing surface surrounds the fluid passage port. The valve plate can move relative to the valve body between a position of opening the fluid passage port and a position of closing the fluid passage port. And in the position of closing the fluid passage port, the valve plate cooperates with the sealing surface of the valve body through its side surface to achieve the sealing of the sealing valve, thereby cutting off the fluid passage. The side surface of the valve plate thus serves as the sealing surface of the valve plate.

[0033] The cross-section of the valve body main body that can cut off the fluid passage described herein can be arranged perpendicular to the axial direction of the fluid passage, or can be arranged obliquely at an angle to the axial direction of the fluid passage.

[0034] The improvement of the sealing valve of the present invention lies in that it further includes an annular expansion bladder, which is provided on the valve body corresponding to the sealing surface of the valve body, or is provided on the part of the valve plate that corresponds to the sealing surface of the valve body when the valve plate is in the position of closing the fluid passage port. When the valve plate is in the position of closing the fluid passage port, the expansion bladder is located between the side surface of the valve plate and the sealing surface of the valve body. The expansion bladder can be filled with and discharged of fluid to control the pressure between the expansion bladder and the side surface of the valve plate and the sealing surface of the valve body.

[0035] The expansion bladder can be filled with and discharged of fluid. When the expansion bladder is filled with fluid, the expansion bladder expands, so that a uniform pressing force is generated between the side surface of the valve plate and the sealing surface of the valve body. When this pressing force reaches a certain sealing specific pressure, the sealing of the sealing valve is achieved. When the sealing of the sealing valve is not required, the expansion bladder can be discharged of fluid, so that the pressure between the side surface of the valve plate and the sealing surface of the valve body is reduced, and even the expansion bladder is separated from the contact with the side surface of the valve plate or the sealing surface of the valve body, thereby releasing the seal between the valve plate and the valve body.

[0036] In this way, the sealing of the sealing valve can be achieved without the direct mechanical extrusion between the sealing surfaces of the valve plate and the valve body, and the accuracy requirements for the sealing surfaces are thus reduced, reducing the processing cost.

[0037] The expansion bladder can also be preferably controlled to be filled with fluid after the valve plate moves to the position of closing the fluid passage port when it is necessary to close the fluid passage port, so as to enhance the pressure between the expansion bladder and the valve plate and the valve body and form a seal. And before the valve plate is about to leave the position of closing the fluid passage port, the fluid is discharged to reduce the pressure between the expansion bladder and the valve plate and the valve body and release the seal.

[0038] This can further prevent the relative movement between the sealing surfaces of the valve plate and the valve body under a relatively large pressure therebetween, thereby further avoiding mechanical wear occurring between the sealing surfaces of the valve plate and the valve body due to friction under a large pressure.

[0039] Multiple types of sealing valves are applicable to the principle of the present invention, including, for example, a gate valve that opens and closes the valve body by the parallel movement of the side surface of the valve plate and the sealing surface of the valve body, a butterfly valve or a telescopic rod type sealing valve that opens and closes the valve body by the movement of the side surface of the valve plate away from and close to the sealing surface of the valve body, and other types of sealing valves that achieve sealing through the cooperation of the side surface of the valve plate and the sealing surface of the valve body.

[0040] When the sealing valve according to the present invention is a gate valve, the valve plate can be a single valve plate or two split valve plates. The fluid passage port can be one or more fluid passage ports provided in a cross-section capable of truncating the fluid passage. The valve plate can achieve sealing with the sealing surface of the valve body with one side surface, or can achieve sealing with the sealing surfaces of the valve body on both sides of the valve plate simultaneously with both side surfaces.

[0041] When the sealing valve according to the present invention is a butterfly valve or a telescopic rod type sealing valve, the fluid passage port can be one or more fluid passage ports provided in a cross-section capable of truncating the fluid passage, and the valve plate can be provided as one or more corresponding to the fluid passage port.

[0042] The present invention will be described in more detail below with reference to specific embodiments of the gate valve shown in the accompanying drawings.

[0043] Figure 1 is a front view of a sealing valve in a closed state according to an embodiment of the present invention, Figure 2 is Figure 1 a partial cross-sectional side view of the sealing valve shown in Figure 3 is along Figure 1 the cross-section A-A shown in Figure 4 is Figure 1 a front view of the sealing valve in an open state of the embodiment shown in

[0044] Referring to Figure 1-4 , the sealing valve is generally denoted by reference numeral 1, and includes a valve body 11 and a valve plate 12. The valve body 11 includes a valve body main body 111 that defines a fluid passage. Combining Figure 1 and Figure 2 it can be seen that the valve body main body 111 is a pipe with a circular cross-section, and the circular cross-section is a rectangular circular cross-section. Further referring to Figure 3, it can be seen more clearly that the valve body 11 further includes an annular recess 114 extending radially outward from the annular cross-section pipe defined by the valve body main body 111. Two side surfaces of the annular recess 114 parallel to the radial direction define sealing surfaces 112 within two parallel cross-sections, and the sealing surfaces 112 are arranged around the fluid passage port 113. The sealing valve 1 further includes an annular expansion bladder 13, which is arranged on the valve body 11 corresponding to the sealing surface 112 of the valve body 11. At Figure 3 the position of closing the fluid passage port 113 shown in, the valve plate 12 realizes sealing through the cooperation of the side surface with the sealing surface 112 of the valve body 11 via the annular expansion bladder 13, thereby truncating the fluid passage defined by the valve body main body 11.

[0045] Referring to Figure 1 , Figure 2 and Figure 4 , it can be seen that the sealing valve 1 further includes a valve plate driving mechanism cavity 17, a valve plate driving device 19, and a connecting device 18 connecting the valve plate driving device 19 and the valve plate 12. The valve plate driving mechanism cavity 17 extends outward from the valve body main body 111 along the movement track of the valve plate 12 to accommodate the movement of the valve plate 12 therein. A part of the connecting device 18 extends into the valve plate driving mechanism cavity 17 in a sealed manner from the outside and is connected to the valve plate 12, and can be driven by the valve plate driving device 19 to enter and exit the valve plate driving mechanism cavity 17, thereby being able to drive the valve plate 12 relative to the valve body 11 between the position of opening the fluid passage port 113 shown in Figure 4 and the position of closing the fluid passage port 113 shown in Figure 1 .

[0046] When it is necessary to switch from the open state of the sealing valve shown in Figure 4 , that is, the non-sealed state between the valve plate 12 and the valve body 11 and the open state of the fluid passage port 113, to the sealed state of the sealing valve 1 shown in Figure 1 , that is, the sealed state between the valve plate 12 and the valve body 11 and the closed state of the fluid passage port 113 to the open state of the fluid passage port 113, the valve plate driving device 19 drives the connecting device 18 into the valve plate driving mechanism cavity 17, thereby translating the valve plate 12 parallel to the sealing surface 112 of the valve body 11, and when it is necessary to switch from the sealed state of the sealing valve shown in Figure 1 to the open state of the sealing valve shown in Figure 4 , the valve plate driving device 19 drives the connecting device 18 to move outward from the valve plate driving mechanism cavity 17, thereby moving the valve plate 12 away from the position of closing the fluid passage port 113 to open the fluid passage port 113.

[0047] Further referring to Figure 3As can be seen, in this embodiment, the sealing surfaces 112 of the valve body 11 defined by the annular recess 114 of the valve body 11 are respectively located on both sides of the valve plate 12 within two cross-sections parallel to each other, and the sealing valve 1 is provided with two annular expansion bladders 13 corresponding to the two sealing surfaces 112 of the valve body 11. Thus, the two side surfaces of the valve body 11 are respectively cooperated with the corresponding sealing surfaces 112 of the valve body 11 via the corresponding annular expansion bladders 13 to achieve sealing.

[0048] Moreover, Figure 3 it is also shown in [the figure] that the sealing valve 1 further includes a spring piece 14 disposed on the inner circumferential side of the annular shape of the expansion bladder 13 relative to the radial direction to protect the expansion bladder 13 when fluid passes during use. The cross-sectional shape of the spring piece 14 along the radial direction of the expansion bladder 13 is a bent shape that protrudes from the fixed surface of the expansion bladder 13 (the sealing surface 112 of the valve body 11 in this embodiment) and can protect the expansion bladder 13 in the radial direction, for example, the bent arc shape shown in the figure, so as to avoid the influence of the thermal action or other chemical actions of the fluid medium on the elastic expansion bladder 13 when the sealing valve 1 is in use. Preferably, the spring piece 14 abuts against or contacts the valve plate 12 when the valve plate 12 moves translationally. For example, as shown in the figure, the spring piece 14 has an arc inflection point at the protruding end, and this arc inflection point abuts against or contacts the valve plate 12 to the maximum extent. Thus, while minimizing the influence of the thermal action or other chemical actions of the fluid medium on the elastic expansion bladder 13, it can constrain the movement trajectory of the valve plate 12 during the process of the valve plate 12 moving translationally to open or close the sealing valve 1, avoid its jamming failure, and play a guiding role. And further combined with Figure 1 As can be seen, the bending direction of the spring piece 14 is preferably set to bend from the sealing surface 112 of the valve body 11 toward the valve plate 12 along the moving direction of closing the fluid passage opening 113, so as to facilitate receiving the valve plate 12 between the two bent spring pieces 14 to guide the movement of the valve plate 12.

[0049] From Figure 3 And combined with Figure 1 、 Figure 2 and Figure 4 It can also be seen that the sealing valve 1 further includes a fluid charging and discharging device 15, which is in fluid communication with the expansion bladder 13 through a fluid medium hose 16, and is used to charge fluid into the expansion bladder 13 or discharge fluid from the expansion bladder 13 via the fluid medium hose 16. The fluid charging and discharging device 15 can achieve pressurization, pressure regulation, pressure maintenance, pressure relief, and evacuation of the expansion bladder 13 as needed, and can be implemented as a device that only charges fluid, a combination of a fluid charging device and a gas extraction device, etc.

[0050] The specific implementation manner of the sealing valve according to the present invention has been described above with reference to Figures 1-4 The sealing valve of the present invention is not limited to that shown in the figure, and can also have the following various deformation forms.

[0051] In this embodiment, since the side surface of the valve plate 12 moves parallel to the sealing surface 112 of the valve body 1, the expansion bladder 13 of the sealing valve 1 is preferably controlled such that when it is necessary to close the fluid passage port 113, after the valve plate 12 is driven by the valve plate driving device 19 to the position where the fluid passage port 113 is closed, fluid is filled into the expansion bladder 13, causing the expansion bladder 13 to elongate along the axial direction of the fluid passage and press tightly against the valve plate 12, enhancing the pressure between the expansion bladder 13 and the side surface of the valve plate 12 and the sealing surface 112 of the valve body 11 to form a seal, thereby achieving the closing or cutting off of the sealing valve 1. And before the valve plate 12 is about to leave the position where the fluid passage port 113 is closed, the fluid is discharged, or even evacuated, to reduce the pressure between the expansion bladder 13 and the valve plate 12 and the valve body 11, so that the distance between the expansion bladder 13 and the valve plate 12 increases until they are out of contact, releasing the seal. Then, the valve plate driving device 19 outputs an action to drive the valve plate 12 to generate a reverse displacement through the valve plate connecting device 18, causing the valve plate 12 to leave the valve body 11 and be located within the valve plate driving mechanism cavity 17, achieving the opening of the sealing valve 1. Thus, mechanical wear during the relative movement of the side surface of the valve plate 12 and the sealing surface 112 of the valve body 11 is reduced or even avoided.

[0052] The expansion bladder 13 in the sealing valve according to the present invention can be made of an elastic material, such as rubber, or can be made of a folded metal foil, which unfolds and expands when filled with fluid and folds and contracts when the fluid is discharged. The expansion bladder made of metal foil is suitable for higher operating temperatures. The fluid medium hose 16 can also be a metal hose or a rubber hose, etc., according to the operating temperature, and can achieve movements such as deformation and torsion.

[0053] In the above embodiment, since the expansion bladder 13 is arranged on the sealing surface 112 of the valve body 11, the spring piece 14 is arranged on the inner circumferential side of the annular shape of the expansion bladder 13 relative to the radial direction to achieve the protection of the expansion bladder 13. The arrangement of the expansion bladder 13 and the spring piece 14 of the sealing valve according to the present invention is not limited to this. The expansion bladder 13 can also be arranged at the part of the valve plate 12 corresponding to the sealing surface 112 when the valve plate 12 is in the position of closing the fluid passage port 13. And in this case, since the expansion bladder 13 moves with the valve plate 12, the expansion bladder 13 will come into multi-directional contact with the fluid when the fluid passes through the fluid passage. The spring piece 14 is preferably arranged on the inner circumferential side and the outer circumferential side of the annular shape of the expansion bladder 13 relative to the radial direction to achieve the protection of the expansion bladder 13. Therefore, the position of the spring piece 14 is set according to the type of the sealing valve 1 and the relative position between the expansion bladder 13 and the fluid during use. The shape of the spring piece 14 can also be set according to the type of the sealing valve 1 and the relative movement mode between the valve plate 12 and the valve body 11. For example, in the case of a butterfly valve or a telescopic rod type sealing valve, since the relative movement between the valve plate and the sealing surface of the valve body is a close or away mode, the spring piece 14 only needs to consider the protection function for the expansion bladder 13 without considering the guiding function for the movement of the valve plate 12.

[0054] In addition, the sealing surface 112 of the valve body 11 of the sealing valve 1 according to the present invention does not necessarily need to be implemented as Figure 1-4 the annular recess extending radially outward from the annular cross-section pipe as shown in Figure 1-4 , and can be implemented in various ways. For example, it can be implemented as an annular sealing surface extending radially inward from the annular cross-section pipe. The annular cross-section pipe is not limited to the rectangular pipe shown in the figure and can be a pipe of other shapes. Therefore, the shape of the annular expansion bladder also depends on the shape of the annular sealing surface provided on the annular cross-section pipe.

[0055] Figure 5 is a front view of the sealing valve in the closed state according to another embodiment of the present invention. Figure 5 The same or similar components in Figure 5 and Figure 1-4 are labeled with the same reference numerals, and for distinction, a symbol "'" is added after the reference numeral.

[0056] Figure 5 The difference between the embodiment shown in Figure 5 and the embodiment shown in Figures 1-4 is that an annular expansion bladder 13' is provided on only one sealing surface 112' of the annular recess 114' of the valve body 11', and a valve seat 10' is provided on the other sealing surface. When the valve plate 12' is in the position of closing the fluid passage port 113', the valve seat 10' pushes against the valve plate 12', and by filling the annular expansion bladder 13' with fluid, a certain sealing specific pressure is achieved among the side surface of the valve plate 12' where the expansion bladder 13' is provided, the sealing surface 112' of the valve body 11' facing the expansion bladder 13', and the annular expansion bladder 13' therebetween. At the same time, the side surface of the valve plate 12' opposite to the expansion bladder 13' presses against the elastic valve seat 10' on the sealing surface of the annular recess 114' facing the valve seat 10' to form the seal of the sealing valve 1'. The valve seat 10' is an elastic metal or non-metal washer.

[0057] Figure 5 The embodiment of the sealing valve shown in Figure 5 and the embodiment of the sealing valve shown in Figures 1-4 are completely the same in other structures, and will not be described repeatedly here.

[0058] Figures 1-4 Both the sealing valve 1 and the sealing valve 1' shown in Figures 1-4 and Figure 5 are vertically installed, that is, the valve plates 12 and 12' move up and down in the vertical direction to open and close the sealing valve. The sealing valve of the present invention is not limited to the shown installation method and can also be horizontally installed. In the case of vertical installation, the valve plate driving device can be connected to the valve plate to drive the valve plate to move up and down either through a flexible connection device such as a wire rope, a chain or a hinge, or through a rigid connection device such as a lead screw, a rack or a rigid shaft. In the case of horizontal installation, the valve plate driving device is preferably connected to the valve plate through a rigid connection device such as a lead screw, a rack or a rigid shaft to drive the valve plate to move horizontally.

[0059] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, a technical solution formed by mutually replacing the above features with technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A sealing valve, comprising: A valve body, including a valve body main body that defines a fluid passage; and a sealing surface and a fluid passage opening provided within a cross-section of the valve body main body that can cut off the fluid passage, the sealing surface being disposed around the fluid passage opening; And A valve plate that can move relative to the valve body between an open fluid passage opening position and a closed fluid passage opening position, and in the closed fluid passage opening position, the valve plate cooperates with the sealing surface of the valve body through its side surface to achieve sealing, thereby cutting off the fluid passage, Wherein, the sealing valve further includes an annular expansion bladder, which is disposed on the valve body corresponding to the sealing surface. When the valve plate is in the closed fluid passage opening position, the expansion bladder is located between the side surface of the valve plate and the sealing surface of the valve body, and the expansion bladder can be filled with and discharged of fluid to control the pressure between the expansion bladder and the side surface of the valve plate and the sealing surface of the valve body, The sealing valve further includes a spring piece, which is disposed on the inner circumferential side and / or outer circumferential side of the annular shape of the expansion bladder relative to the radial direction to protect the expansion bladder when fluid passes through during use, The cross-sectional shape of the spring piece along the radial direction of the expansion bladder is a bent shape that extends from the expansion bladder fixing surface and can protect the expansion bladder in the radial direction, and The spring piece abuts against or contacts the valve plate when the valve plate moves translationally to guide the movement of the valve plate.

2. The sealed valve according to claim 1, wherein, The expansion bladder is controlled to be filled with fluid after the valve plate moves to the closed fluid passage opening position when it is necessary to close the fluid passage opening, so as to enhance the pressure between the expansion bladder and the valve plate and the valve body and form a seal, and before the valve plate is about to leave the closed fluid passage opening position, the fluid is discharged to reduce the pressure between the expansion bladder and the valve plate and the valve body and release the seal.

3. The sealed valve according to claim 1, wherein, The spring piece is made of non-metal or metal.

4. The sealed valve according to any one of claims 1-3, wherein, The valve plate moves translationally between the open fluid passage opening position and the closed fluid passage opening position parallel to the sealing surface of the valve body, and the spring piece is disposed on the inner circumferential side of the annular shape of the expansion bladder relative to the radial direction.

5. The sealed valve according to claim 4, wherein, The valve body includes sealing surfaces provided in two cross-sections parallel to each other, and the sealing surfaces in the two cross-sections are respectively located on both sides of the valve plate.

6. The sealed valve according to claim 5, wherein, Expansion bladders are provided on the sealing surfaces of both cross-sections, or among the sealing surfaces in the two cross-sections, an expansion bladder is provided on the sealing surface of one cross-section, and a valve seat is provided on the other. The valve seat abuts against the valve plate to form a seal when the valve plate is in the closed fluid passage opening position.

7. The sealed valve according to claim 6, wherein, The valve seat is a metal or non-metal washer.

8. The sealed valve according to any one of claims 5-7, wherein, The valve body main body is a pipe with an annular cross-section, and the valve body further includes an annular recess extending radially outward from the annular cross-section pipe. Two side surfaces of the annular recess parallel to the radial direction define the sealing surfaces in two parallel cross-sections.

9. The sealed valve according to any one of claims 1-3, 5-7, wherein, The expansion bladder is made of an elastic material or a metal foil.

10. The sealed valve according to claim 4, wherein, The expansion bladder is made of an elastic material or a metal foil.

11. The sealed valve according to any one of claims 1-3, 5-7, wherein, The sealing valve further includes a fluid charging and discharging device, which is in fluid communication with the expansion bladder through a fluid medium hose and is used to fill the expansion bladder with fluid or discharge the fluid from the expansion bladder via the fluid medium hose.

12. The sealed valve according to claim 4, wherein, The sealing valve further includes a fluid charging and discharging device, which is in fluid communication with the expansion bladder through a fluid medium hose and is used to fill the expansion bladder with fluid or discharge the fluid from the expansion bladder via the fluid medium hose.

13. The sealed valve according to claim 11, wherein, The fluid medium hose is a metal hose or a rubber hose.

14. The sealed valve according to claim 12, wherein, The fluid medium hose is a metal hose or a rubber hose.

15. The sealed valve according to claim 4, wherein, The sealed valve further includes a valve plate drive mechanism cavity, a valve plate drive device, and a connecting device connecting the valve plate drive device and the valve plate. The valve plate drive mechanism cavity extends outward from the valve body main body along the movement track of the valve plate to accommodate the movement of the valve plate therein. A part of the connecting device extends into the valve plate drive mechanism cavity in a sealed manner from the outside and is connected to the valve plate, and can be driven by the valve plate drive device to enter and exit the valve plate drive mechanism cavity. Thus, when it is necessary to close the fluid passage opening from the unsealed state between the valve plate and the valve body, the connecting device is driven into the valve plate drive mechanism cavity, so as to move the valve plate from the position of opening the fluid passage opening to the position of closing the fluid passage opening. And when it is necessary to open the fluid passage opening from the sealed state between the valve plate and the valve body, the connecting device is driven to move outward from the valve plate drive mechanism cavity, so as to move the valve plate away from the position of closing the fluid passage opening to open the fluid passage opening.

16. The sealed valve according to any one of claims 5-7, wherein, The sealed valve further includes a valve plate drive mechanism cavity, a valve plate drive device, and a connecting device connecting the valve plate drive device and the valve plate. The valve plate drive mechanism cavity extends outward from the valve body main body along the movement track of the valve plate to accommodate the movement of the valve plate therein. A part of the connecting device extends into the valve plate drive mechanism cavity in a sealed manner from the outside and is connected to the valve plate, and can be driven by the valve plate drive device to enter and exit the valve plate drive mechanism cavity. Thus, when it is necessary to close the fluid passage opening from the unsealed state between the valve plate and the valve body, the connecting device is driven into the valve plate drive mechanism cavity, so as to move the valve plate from the position of opening the fluid passage opening to the position of closing the fluid passage opening. And when it is necessary to open the fluid passage opening from the sealed state between the valve plate and the valve body, the connecting device is driven to move outward from the valve plate drive mechanism cavity, so as to move the valve plate away from the position of closing the fluid passage opening to open the fluid passage opening.

17. The sealed valve according to claim 8, wherein, The sealed valve further includes a valve plate drive mechanism cavity, a valve plate drive device, and a connecting device connecting the valve plate drive device and the valve plate. The valve plate drive mechanism cavity extends outward from the valve body main body along the movement track of the valve plate to accommodate the movement of the valve plate therein. A part of the connecting device extends into the valve plate drive mechanism cavity in a sealed manner from the outside and is connected to the valve plate, and can be driven by the valve plate drive device to enter and exit the valve plate drive mechanism cavity. Thus, when it is necessary to close the fluid passage opening from the unsealed state between the valve plate and the valve body, the connecting device is driven into the valve plate drive mechanism cavity, so as to move the valve plate from the position of opening the fluid passage opening to the position of closing the fluid passage opening. And when it is necessary to open the fluid passage opening from the sealed state between the valve plate and the valve body, the connecting device is driven to move outward from the valve plate drive mechanism cavity, so as to move the valve plate away from the position of closing the fluid passage opening to open the fluid passage opening.

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