Biological closed valve

Abstract

The invention relates to a biological sealing valve which comprises a first valve body, a second valve body, a blade and a linkage mechanism, the first valve body and the second valve body are integrally formed in a spinning mode, a first soft sealing gasket is arranged between the first valve body and the second valve body, the linkage mechanism is arranged on the second valve body and connected with the blade, and a second soft sealing gasket is arranged between the second valve body and the blade. The linkage mechanism drives the blades to enable the second valve body to move linearly in the axis direction and then to be attached to or separated from the first soft sealing gasket, and the linkage mechanism drives the blades to turn over. According to the biological sealing valve, a blade sealing structure is improved, multi-connecting-rod pushing and pressing type sealing is adopted, abrasion of a soft sealing gasket is reduced, and gas leakage in the long-term opening and closing use process of the valve is prevented; multi-connecting-rod push-press type sealing is adopted, needed torsion is reduced, the requirement for an actuator is lowered, and therefore the overall cost of the valve is lowered; the blades are integrally formed through spinning, the strength of the blades is improved, blade reinforcing ribs are prevented from being welded, materials are reduced, the welding amount is reduced, and cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, in particular to a biological airtight valve. Background Art

[0002] Bio-sealed valves are commonly used in biomedicine, laboratory, and clean room systems. They are required to have zero internal and external leakage under a certain pressure to prevent gas molecules from overflowing from pipes, equipment, or rooms. They are also required to have higher sealing performance when the valve is closed.

[0003] At present, the commonly used biological closed valve is an axial type, that is, two blades clamp a soft sealing gasket, and the soft sealing gasket squeezes the inner surface of the valve body for sealing. Although this biological closed valve can block the airflow, in actual work, as the number of switches increases, the edge of the soft sealing gasket will be aggravated, resulting in the failure to guarantee zero leakage under the working pressure in the later stage. This structural sealing form also requires the use of a larger torque actuator for driving. The back of the blade needs to be welded with reinforcing ribs to increase the strength and prevent the blade from deforming. At the same time, the flanges set on both sides of this valve are generally welded to the valve body as separate flanges. Due to welding deformation, it is difficult to ensure during welding, so the flatness of the flange surface will have a large error. After the pipeline is installed, gas leakage occurs on the flange surface, which cannot meet the requirements of the working conditions of this type of valve. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem of unreasonable structural design of biological closed valves in the prior art, which causes the risk of leakage.

[0005] In order to solve the above technical problems, the present invention provides a biological airtight valve, comprising: a first valve body, a second valve body, a blade and a linkage mechanism, wherein the first valve body and the second valve body are integrally formed by spinning, and the first valve body and the second valve body form a hollow cylindrical shape, a first soft sealing pad is arranged between the first valve body and the second valve body, the linkage mechanism is arranged on the second valve body, and the linkage mechanism is connected to the blade, the linkage mechanism drives the blade to achieve linear movement in the direction of the axis of the second valve body and then fit or separate from the first soft sealing pad, and the linkage mechanism drives the blade to flip; wherein the linkage mechanism comprises a valve stem, a main linkage rod, a sleeve, a driven connecting rod, a driven rotating shaft, an active rotating shaft, a linkage side plate, a pin and a fixed The valve stem penetrates the second valve body in a radial direction, and the valve stem is rotatably arranged on the second valve body, the valve stem is arranged eccentrically in the radial direction of the second valve body, the sleeve is sleeved on the outer wall of the valve stem located inside the second valve body, one end of the main linkage rod is fixedly connected to the outer wall of the sleeve, and the other end of the main linkage rod is hinged with the linkage side plate through an active rotating shaft, the active rotating shaft is arranged at the middle position of the linkage side plate, the linkage side plate is fixedly connected to the blade, one end of the driven connecting rod is hinged with the end of the linkage side plate away from the blade through the driven rotating shaft, the other end of the driven connecting rod is connected with the fixing strip through a pin, the middle position of the fixing strip is sleeved on the valve stem, and the other end of the fixing strip is limited to the inner wall of the second valve body.

[0006] In one embodiment of the present invention, an axial end sleeve and a terminal sleeve are provided on the inner wall of the second valve body, one end of the valve stem is arranged in the terminal sleeve, and the other end of the valve stem passes through the axial end sleeve.

[0007] In one embodiment of the present invention, one end of the valve stem passes through the shaft end sleeve and extends out of the second valve body, and the valve stem is located outside the second valve body and is connected to a manual actuator for rotating the valve stem.

[0008] In one embodiment of the present invention, an actuator base side plate is fixedly provided on the outer wall of the second valve body, an actuator base cover plate is connected to the actuator base side plate, and the manual actuator is mounted on the actuator base cover plate.

[0009] In one embodiment of the present invention, a cushion block is fixedly provided on the inner wall of the second valve body, the cushion block is a rectangular block, a rectangular through hole is provided inside the cushion block, fixing bolts are provided on two opposite surfaces of the cushion block, one end of the fixing bolt passes through the cushion block and is placed in the rectangular through hole, one end of the fixing strip is arranged in the rectangular through hole, and the fixing bolt is used to limit the end of the fixing strip located in the rectangular through hole.

[0010] In one embodiment of the present invention, one end of the main linkage rod is welded to the outer wall of the sleeve.

[0011] In one embodiment of the present invention, the cross-sections of the first valve body and the second valve body are both annular, a first concave platform is provided on the circumferential outer wall of the first valve body close to one end of the second valve body, and the outer wall of the first concave platform is in contact with the inner wall of the second valve body.

[0012] In one embodiment of the present invention, a second concave platform is provided at the end of the first valve body extending into the second valve body, and the first soft sealing gasket is arranged on the second concave platform.

[0013] In one embodiment of the present invention, a first PTFE reverse bushing is provided inside the end sleeve, and one end of the valve stem is disposed in the first PTFE reverse bushing.

[0014] In one embodiment of the present invention, a pressure block is connected to one end of the shaft end sleeve located outside the second valve body, a second PTFE reverse bushing is provided on the inner wall of the shaft end sleeve, the valve stem passes through the second PTFE reverse bushing, an O-ring is provided between the second PTFE reverse bushing and the pressure block, and the O-ring is sleeved on the valve stem.

[0015] Compared with the prior art, the biological airtight valve of the present invention has the following beneficial effects: 1. Improve the blade sealing structure and adopt multi-link push-type sealing to reduce the wear of soft sealing gaskets and prevent gas leakage during long-term switching of the valve, which cannot meet the working conditions; 2. Improve the blade sealing structure and adopt multi-link push-type sealing to reduce the required torque and the requirements for the actuator, thereby reducing the overall cost of the valve; 3. Improve the valve body structure. The valve bodies, flanges and internal retaining strips on both sides of the valve body are integrally formed by spinning process. Ensure the flatness of the flange and the sealing of the flange surface when the valve is installed. Enhance the strength of the flange and retaining strip, reduce the material loss of the flange and retaining strip, reduce the amount of welding, and reduce costs; 4. Improve the blade structure and use spinning one-piece blades to increase blade strength, avoid welding blade reinforcement ribs, reduce materials, reduce welding volume, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 An exploded view of a biological containment valve in a preferred embodiment of the present invention; Figure 2 It is an assembly diagram of a biological containment valve in a preferred embodiment of the present invention; Figure 3 A rear view of a biological containment valve in a preferred embodiment of the present invention; Figure 4It is a front view of the biological airtight valve in the preferred embodiment of the present invention; Figure 5 A top view of a biological containment valve in a preferred embodiment of the present invention; Figure 6 This is a schematic structural diagram of a first valve body in a preferred embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the second valve body in a preferred embodiment of the present invention; Figure 8 An assembly diagram of a first valve body and a second valve body in a preferred embodiment of the present invention; Fig. 9 It is a front view of the first valve body and the second valve body in a preferred embodiment of the present invention; Fig.10 In the preferred embodiment of the present invention Fig. 9 Sectional view along the AA direction; Fig.11 It is a front view of the blade and linkage mechanism in the preferred embodiment of the present invention; Fig.12 A side view of a blade and a linkage mechanism in a preferred embodiment of the present invention; Fig.13 The isometric side view of the blade and linkage mechanism in the preferred embodiment of the present invention is shown in FIG. Figure 1 ; Fig.14 The isometric side view of the blade and linkage mechanism in the preferred embodiment of the present invention is shown in FIG. Figure 2 ; Fig.15 A top view of the blades and linkage mechanism in a preferred embodiment of the present invention; Fig.16 It is a front view of the blade and linkage mechanism in the preferred embodiment of the present invention; Fig.17 The partial structure of the biological closed valve in the preferred embodiment of the present invention is shown in FIG. Figure 1 ; Fig.18 The partial structure of the biological closed valve in the preferred embodiment of the present invention is shown in FIG. Figure 2 ; Fig.19 In the preferred embodiment of the present invention Fig.18 Cross-section along the middle BB direction; Fig. 20 The cross section of the biological closed valve in the preferred embodiment of the present invention is Figure 2 ; Figure 21-24 This is a process diagram of the biological containment valve being opened in a preferred embodiment of the present invention.

[0017] Explanation of the reference numerals in the specification: 1: first valve body; 2: second valve body; 3: first soft sealing gasket 4: actuator base cover plate; 5: actuator base side plate; 6: gasket; 7: fixing bolt; 8: fixing strip; 9: shaft end sleeve; 10: end sleeve; 11: valve stem; 12: blade; 13: first bolt; 14: third bolt; 15: pressure block; 16: soft sealing gasket; 17: brass gasket; 18: fluororubber O-ring; 19: PTFE reverse bushing; 20: fixing gasket; 21: PTFE reverse bushing; 22: bolt; 23: manual actuator; L: linkage mechanism. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0019] Reference Figure 1-5 As shown, the biological closed valve of the present invention comprises: a first valve body 1, a second valve body 2, a blade 12 and a linkage mechanism L, wherein the first valve body 1 and the second valve body 2 are integrally formed by spinning, and the first valve body 1 and the second valve body 2 form a hollow cylindrical shape, a first soft sealing pad 3 is arranged between the first valve body 1 and the second valve body 2, the linkage mechanism L is arranged on the second valve body 2, and the linkage mechanism L is connected to the blade 12, the linkage mechanism L drives the blade 12 to achieve the second valve body 2 to move linearly in the axial direction and then fit or separate from the first soft sealing pad 3, and the linkage mechanism L drives the blade 12 to flip. The valve body comprises the first valve body 1 and the second valve body 2, both of which have high strength, and adopt the spinning integral forming process, so that the strength can be guaranteed. The flanges on both sides of the first valve body 1 and the second valve body 2 and the side edges of the baffles are formed by spinning with the first valve body 1 and the second valve body 2, so the overall strength is further guaranteed. In addition to the above methods, the first valve body 1 and the second valve body 2 can also be connected together by annular seam welding or riveting. The first soft sealing gasket 3 is filled inside the baffle formed by connecting the first valve body 1 and the second valve body 2.

[0020] Among them, refer to Figure 11-16As shown, the linkage mechanism L includes a valve stem 11, a main linkage rod L-2, a sleeve L-3, a driven connecting rod L-6, a driven rotating shaft L-7, an active rotating shaft L-8, a linkage side plate L-9, a pin L-13 and a fixing strip 8, the valve stem 11 radially penetrates the second valve body 2, and the valve stem 11 is rotatably arranged on the second valve body 2, the valve stem 11 is eccentrically arranged in the radial direction of the second valve body 2, the sleeve L-3 is sleeved on the outer wall of the valve stem 11 located inside the second valve body 2, one end of the main linkage rod L-2 is fixedly connected to the outer wall of the sleeve L-3, and The other end of the main linkage rod L-2 is hinged through the active rotating shaft L-8 and the linkage side plate L-9, and the active rotating shaft L-8 is arranged at the middle position of the linkage side plate L-9, and the linkage side plate L-9 is fixedly connected to the blade 12. One end of the driven connecting rod L-6 is hinged through the driven rotating shaft L-7 and the end of the linkage side plate L-9 away from the blade 12, and the other end of the driven connecting rod L-6 is connected to the fixing strip 8 through the pin L-13. The middle position of the fixing strip 8 is sleeved on the valve stem 11, and the other end of the fixing strip 8 is limited on the inner wall of the second valve body 2.

[0021] Specifically, the linkage mechanism L is composed of: blade gasket L-1, main linkage block L-2, sleeve L-3, second bolt L-4, retaining spring L-5, slave connecting rod L-6, slave rotating shaft L-7, main rotating shaft L-8, linkage side plate L-9, bolt L-10, brass gasket L-11, brass gasket L-12, pin L-13, brass gasket L-14, brass gasket L-15, bolt L-16, which are assembled and connected to form each other. One end of the main linkage rod L-2 is welded to the outer wall of the sleeve L-3. The linkage mechanism L is connected to the blade 12 through the first bolt 13. The blade 12 is integrally spun and has high strength. The valve stem 11 passes through the linkage mechanism L and the fixing strip 8. The linkage mechanism L adjusts the initial angle of the blade with the valve stem 11 through the second bolt L-4, and then the sleeve L-3 is welded and fixedly connected to the valve stem 11. The main linkage block L-2 and the sleeve L-3 are welded as one. There is a double-link motion between the main linkage block L-2, the fixed bar 8, the linkage side plate L-10 and the slave linkage rod L-6. When the valve stem 11 rotates counterclockwise, it drives the sleeve L-3 and the main linkage block L-2 to rotate counterclockwise. This drives the blade gasket L-1 and the blade 12 to move backward for a distance, away from the first soft sealing pad 3, and then rotate counterclockwise. This opens the blade 12. When the valve stem 11 rotates clockwise, it drives the sleeve L-3 and the main linkage block L-2 to rotate clockwise. This drives the blade gasket L-1 and the blade 12 to rotate clockwise first, and then move forward for a distance to press the first soft sealing pad 3, and close the blade 12 for internal sealing. The whole process greatly reduces the wear of the first soft sealing pad 3 and the torque required to open and close the blade 12.

[0022] Reference Fig.17 ,18 As shown, the inner wall of the second valve body 2 is provided with an axial end sleeve 9 and a terminal sleeve 10, one end of the valve stem 11 is arranged in the terminal sleeve 10, and the other end of the valve stem 11 passes through the axial end sleeve 9. One end of the valve stem 11 passes through the axial end sleeve 9 and extends out of the second valve body 2, and the valve stem 11 is located outside the second valve body 2 and is connected to a manual actuator 23, and the manual actuator 23 is used to rotate the valve stem 11. The axial end sleeve 9 and the terminal sleeve 10 are located on the same straight line, and the straight line where the axial end sleeve 9 and the terminal sleeve 10 are located is eccentric to the diameter of the second valve body 2.

[0023] Specifically, a PTFE reverse bushing 19 is arranged on the shaft end sleeve 9 near the inside of the valve body 2. It plays the role of positioning the valve stem 11 and reducing the rotation friction of the valve stem 11. A fixing gasket 20 is arranged on the valve stem 11 to fix the PTFE reverse bushing 19. Multiple layers of brass gaskets 17 and fluororubber O-rings 18 are alternately filled in the shaft end sleeve 9, and then a pressure block 15 is used to squeeze through the third bolt 14 to seal the valve stem 11 and the shaft end sleeve 9. At the same time, a soft sealing gasket 16 is also arranged between the pressure block 15 and the shaft end sleeve 9 to further seal the valve stem 11 and the shaft end sleeve 9. Ensure the external sealing of the valve. A PTFE reverse bushing 21 is arranged on the end sleeve 10 to play the role of positioning the valve stem 11 and reducing the rotation friction of the valve stem 11. A fixing gasket 20 is arranged on the valve stem 11 to fix the PTFE reverse bushing 21. A manual actuator 23 is arranged on the actuator base cover 4 to open and close the valve.

[0024] Reference Figure 8 As shown, an actuator base side plate 5 is fixedly provided on the outer wall of the second valve body 2 , an actuator base cover plate 4 is connected to the actuator base side plate 5 , and the manual actuator 23 is mounted on the actuator base cover plate 4 .

[0025] Reference Figure 8 As shown, a cushion block 6 is fixedly provided on the inner wall of the second valve body 2. The cushion block 6 is a rectangular block. A rectangular through hole is provided inside the cushion block 6. Fixing bolts 7 are provided on two opposite surfaces of the cushion block 6. One end of the fixing bolt 7 passes through the cushion block 6 and is placed in the rectangular through hole. One end of the fixing bar 8 is arranged in the rectangular through hole. The fixing bolt 7 is used to limit the end of the fixing bar 8 located in the rectangular through hole. The cushion block 6 and the fixing bolt 7 form a limiting structure of the fixing bar 8. The fixing bar 8 is a "√" symbol-shaped structure, which can fix one end of the fixing bar 8 so that when the valve stem 11 is rotated by the manual actuator 23, the fixing bar 8 will not rotate, so that the other end of the fixing bar 8 forms a fulcrum for rotation, which is used as a support point for the rotation of the driven shaft L-7.

[0026] Reference Figure 6-10As shown, the cross-sections of the first valve body 1 and the second valve body 2 are both annular, and a first concave platform is provided on the circumferential outer wall of the first valve body 1 near one end of the second valve body 2, and the outer wall of the first concave platform is in contact with the inner wall of the second valve body 2. A second concave platform is provided at the end of the first valve body 1 extending into the second valve body 2, and the first soft sealing pad 3 is arranged on the second concave platform.

[0027] Reference Fig.19 , 20 As shown, a first PTFE reverse bushing 21 is provided inside the end sleeve 10, and one end of the valve stem 11 is arranged inside the first PTFE reverse bushing 21. A fixing gasket 20 is connected to one end of the shaft end sleeve 9 located inside the second valve body 2, and a pressing block 15 is connected to one end of the shaft end sleeve 9 located outside the second valve body 2. A second PTFE reverse bushing 19 is provided on the inner wall of the shaft end sleeve 9, and the valve stem 11 passes through the second PTFE reverse bushing 19. An O-ring 18 is provided between the second PTFE reverse bushing 19 and the pressing block 15, and the O-ring 18 is sleeved on the valve stem 11.

[0028] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A biological airtight valve, characterized in that: include: A first valve body, a second valve body, a blade and a linkage mechanism, wherein the first valve body and the second valve body are integrally formed by spinning, and the first valve body and the second valve body form a hollow cylindrical shape, a first soft sealing gasket is arranged between the first valve body and the second valve body, the linkage mechanism is arranged on the second valve body, and the linkage mechanism is connected to the blade, the linkage mechanism drives the blade to move linearly in the direction of the axis of the second valve body and then fit or separate from the first soft sealing gasket, and the linkage mechanism drives the blade to flip; In which, the linkage mechanism includes a valve stem, a main linkage rod, a sleeve, a driven linkage rod, a driven rotating shaft, a driving rotating shaft, a linkage side plate, a pin and a fixing strip, the valve stem radially penetrates the second valve body, and the valve stem is rotatably arranged on the second valve body, the valve stem is eccentrically arranged in the radial direction of the second valve body, the sleeve is sleeved on the outer wall of the valve stem located inside the second valve body, one end of the main linkage rod is fixedly connected to the outer wall of the sleeve, and the other end of the main linkage rod is hinged to the linkage side plate through the driving rotating shaft, the driving rotating shaft is arranged at the middle position of the linkage side plate, the linkage side plate is fixedly connected to the blade, one end of the driven linkage rod is hinged to the end of the linkage side plate away from the blade through the driven rotating shaft, the other end of the driven linkage rod is connected to the fixing strip through the pin, the middle position of the fixing strip is sleeved on the valve stem, and the other end of the fixing strip is limited to the inner wall of the second valve body.

2. The biological containment valve according to claim 1, characterized in that: An axial end sleeve and a terminal sleeve are arranged on the inner wall of the second valve body, one end of the valve stem is arranged in the terminal sleeve, and the other end of the valve stem passes through the axial end sleeve.

3. The biological containment valve according to claim 2, characterized in that: One end of the valve stem passes through the shaft end sleeve and extends out of the second valve body, and the valve stem is located outside the second valve body and is connected to a manual actuator, which is used to rotate the valve stem.

4. The biological containment valve according to claim 3, characterized in that: An actuator base side plate is fixedly provided on the outer wall of the second valve body, an actuator base cover plate is connected to the actuator base side plate, and the manual actuator is installed on the actuator base cover plate.

5. The biological containment valve according to claim 1, characterized in that: A pad is fixedly provided on the inner wall of the second valve body, the pad is a rectangular block, a rectangular through hole is provided inside the pad, fixing bolts are provided on two opposite surfaces of the pad, one end of the fixing bolt passes through the pad and is placed in the rectangular through hole, one end of the fixing strip is arranged in the rectangular through hole, and the fixing bolt is used to limit the end of the fixing strip located in the rectangular through hole.

6. The biological containment valve according to claim 1, characterized in that: One end of the main linkage rod is welded to the outer wall of the sleeve.

7. The biological containment valve according to claim 1, characterized in that: The cross-sections of the first valve body and the second valve body are both annular. A first concave platform is provided on the circumferential outer wall of the first valve body close to one end of the second valve body. The outer wall of the first concave platform fits with the inner wall of the second valve body.

8. The biological containment valve according to claim 7, characterized in that: A second concave platform is provided at the end of the first valve body extending into the second valve body, and the first soft sealing pad is arranged on the second concave platform.

9. The biological containment valve according to claim 2, characterized in that: A first PTFE reverse bushing is arranged inside the end sleeve, and one end of the valve stem is arranged in the first PTFE reverse bushing.

10. The biological containment valve according to claim 2, characterized in that: The shaft end sleeve is located at one end outside the second valve body and is connected to a pressure block, a second PTFE reverse bushing is provided on the inner wall of the shaft end sleeve, the valve stem passes through the second PTFE reverse bushing, an O-ring is provided between the second PTFE reverse bushing and the pressure block, and the O-ring is sleeved on the valve stem.

Images