Single drive tube clamp valve in vacuum environment

Abstract

This application relates to the technical field of pinch valves, and in particular to a single-drive pinch valve for vacuum environments. It includes a sealed cavity containing an elastic core and a drive mechanism. A vacuum suction port is provided on the sealed cavity. The drive mechanism is connected to the side wall of the elastic core and is used to drive the side wall of the elastic core to move inward to close or outward to open. The drive mechanism includes a drive cylinder, a linkage assembly, a core pull lug, a left pressure lever, and a right pressure lever. The left and right pressure levers are both connected to the piston rod of the drive cylinder via the linkage assembly. The core pull lugs are located on both radial sides of the elastic core and are made of a soft material. One end of the core pull lug is fixedly connected to the outer side wall of the elastic core, and the other end is correspondingly installed on the left and right pressure levers. This application has the effect of improving the service life of pinch valves under high-sensitivity explosive conditions.

Description

Technical Field

[0001] This application relates to the technical field of pinch valves, and in particular to a single-drive pinch valve for vacuum environments. Background Technology

[0002] Pinch valves are widely used in mining, medical, bioprocessing, biotechnology, pharmaceutical, chemical, food and beverage industries due to their excellent corrosion resistance, wear resistance and non-contact sealing characteristics. Their core is usually a flexible tube made of rubber, polyurethane or other polymer elastic materials. The working principle is that the clamping mechanism squeezes the tube through pneumatic, electric or hydraulic drive, thereby realizing the opening or closing of the fluid or the regulation of the flow.

[0003] Common pinch valve applications primarily involve fluid pipelines under positive pressure. Even after the valve hose undergoes plastic deformation, the internal positive pressure allows for smooth flow control of the medium, including opening, closing, or regulation of the flow rate. However, when the delivery channel is in a vacuum environment, the deformable nature of the valve hose causes a significant pressure difference when the outlet becomes a vacuum, preventing the valve from opening. Even with added tension straps to the hose core, the excessive tension leads to localized stress on the core, resulting in a very short service life. The filling process of highly sensitive explosives requires protection from impacts, contamination, and static electricity. Therefore, developing a pinch valve suitable for this operating environment is a pressing issue. Utility Model Content

[0004] In order to improve the service life of the clamp valve under high-sensitivity explosive conditions, this application provides a single-drive clamp valve for vacuum environment.

[0005] The vacuum environment single-drive clamp valve provided in this application adopts the following technical solution:

[0006] A vacuum environment single-drive clamp valve includes a sealed cavity, in which an elastic core and a drive mechanism are disposed;

[0007] The sealed cavity is provided with a vacuum suction port; the driving mechanism is connected to the side wall of the elastic core and is used to drive the side wall of the elastic core to move inward to close or outward to open.

[0008] By adopting the above technical solution, the top of the elastic core is the material inlet, and the bottom of the elastic core is the material outlet. This pinch valve is suitable for the following working environments: the material inlet is at normal pressure, and the container connected to the material outlet is in a vacuum environment with a maximum vacuum pressure of -0.095 MPa. This application uses a vacuum suction port to vacuum the sealing cavity, making the sealing cavity reach the same vacuum pressure as the material outlet container. This ensures that the pressure inside and outside the elastic core is the same, avoiding the enormous pressure the valve experiences when opening. This also avoids damage to the elastic core and energy waste caused by the drive mechanism forcibly moving the elastic core, thus achieving the same operating environment as ordinary pinch valves and improving the service life of the pinch valve under high-sensitivity explosive conditions.

[0009] Optionally, the drive mechanism includes a drive cylinder, a linkage assembly, a core pull lug, a left pressure bar, and a right pressure bar. The left pressure bar and the right pressure bar are both connected to the piston rod of the drive cylinder through the linkage assembly. The core pull lug is located on both sides of the elastic core in the radial direction and is made of a soft material.

[0010] One end of the tube core pull lug is fixedly connected to the outer wall of the elastic tube core, and the other end is installed on the left and right pressure bars respectively; the drive cylinder drives the left pressure bar, the right pressure bar and the tube core pull lugs on both sides to move synchronously through the linkage assembly, and the left pressure bar and the right pressure bar move in opposite directions.

[0011] By adopting the above technical solution, when the clamp valve needs to be closed, that is, when the side wall of the elastic core needs to be moved inward to close, the drive cylinder is activated. The piston rod of the drive cylinder extends and drives the left and right pressure rods to move towards the elastic core through the linkage assembly, thereby squeezing the side wall of the elastic core inward to abut, thus achieving the closure of the clamp valve.

[0012] When the pinch valve needs to open, i.e., when the side wall of the elastic core needs to move outward to open, the drive cylinder is activated. The piston rod of the drive cylinder retracts and drives the left and right pressure levers to reset via the linkage assembly. This means the left and right pressure levers move away from the elastic core, while the core pull lug pulls the side wall of the elastic core outward to its reset position, thus opening the pinch valve. The stroke of the drive cylinder can be controlled according to the required feed rate. Under the action of the linkage assembly, the left and right pressure levers and the core pull lug cooperate to control the opening of the elastic core, thereby controlling the feed rate. The operation is simple and reliable.

[0013] Optionally, the linkage component includes a mounting base, a connecting rod, and a guide shaft;

[0014] One end of the mounting base is fixedly connected to the piston rod of the drive cylinder, and the other end of the mounting base is fixedly connected to the right pressure bar;

[0015] The connecting rods are symmetrically arranged on both sides of the mounting base, and the guide shafts are also symmetrically arranged on both sides of the mounting base. One end of each connecting rod on both sides is hinged to the mounting base, and the other end of each connecting rod on both sides is hinged to the corresponding guide shaft. Two positioning rods are fixedly installed in the sealed cavity, and the middle part of the connecting rod is rotatably connected to the positioning rod through a rotating shaft.

[0016] A guide cylinder for the guide shaft to pass through is fixedly installed inside the sealed cavity, and the ends of the guide shafts on both sides away from the connecting rod are fixedly connected to the left pressure bar; the left pressure bar and the right pressure bar are arranged on both sides of the elastic core in the radial direction.

[0017] By adopting the above technical solution, when the left pressure bar, right pressure bar, and core lug need to move synchronously, the drive cylinder is activated. The piston rod of the drive cylinder drives the mounting base to move, which directly acts on the right pressure bar, causing it to move. Simultaneously, it drives the connecting rod to rotate around its central axis, which in turn drives the guide shaft to move linearly within the guide cylinder, thereby moving the left pressure bar. Since one end of the core lug is mounted on the left and right pressure bars, it can move synchronously with them.

[0018] The core pull lugs are fixed to the left and right pressure bars respectively, and move together with the left and right pressure bars. When the drive mechanism drives the right pressure bar to move to the left, the left pressure bar moves synchronously to the right through the linkage component, thereby achieving the purpose of both left and right pressure bars moving towards the center at the same time. This ensures that the center line of the elastic core always remains in the center position, and that the pressure and tensile deformation on the left and right tube walls are consistent, reducing damage to the core.

[0019] Optionally, the linkage component is disposed within a sealed cavity.

[0020] By adopting the above technical solution, the linkage mechanism is completely enclosed in a sealed cavity, which reduces the number of vulnerable parts and leakage points, enhances sealing performance, and reduces maintenance costs during use.

[0021] Optionally, the guide shafts on both sides pass through both ends of the right pressure bar.

[0022] By adopting the above technical solution, the linkage mechanism ensures that the left and right pressure bars run on the same axis through the constraints of multiple guiding mechanisms.

[0023] Optionally, the core pull lugs are located on both sides of the thickness direction of the left and right pressure bars, and are fixed to the left and right pressure bars by pressure blocks and bolts.

[0024] Optionally, both the left and right pressure bars are arranged in an arc shape on the side facing the elastic core.

[0025] By adopting the above technical solution, the left and right pressure bars are in line contact with the elastic core, which reduces the tensile deformation of the tube wall during clamping, enhances the sealing of the clamp valve, and improves the service life of the elastic core.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The valve cavity is sealed, forming a closed space. When the material outlet is in a vacuum environment, the pressure inside the cavity can be drawn to the same vacuum level as the outlet end. The pressure on the inner and outer walls of the elastic core is the same, which can be easily opened without putting a lot of tension on the tube wall, greatly improving its service life.

[0028] 2. The elastic core creates the same pressure environment inside and outside, which greatly reduces the energy consumption of the drive mechanism, saves energy consumption during use, and reduces the cost of the valve;

[0029] 3. The linkage component enables both sides of the elastic core to be compressed (tensioned) simultaneously, with basically the same deformation, thus improving the service life of the elastic core;

[0030] 4. The contact surfaces of the left and right pressure bars with the elastic core are both designed with arc shape, so that they are in line contact with the elastic core. This reduces the tensile deformation of the elastic core wall during compression, enhances the sealing of the valve closure, and improves the service life of the elastic core.

[0031] 5. By enclosing the entire linkage mechanism within a sealed cavity, the number of vulnerable parts and leakage points are reduced, sealing performance is enhanced, and maintenance costs during use are lowered.

[0032] 6. The linkage mechanism, through the constraints of multiple guiding mechanisms, ensures that the left and right pressure bars run on the same axis;

[0033] 7. The drive mechanism can adjust the valve body in real time and throughout the entire range. Attached Figure Description

[0034] Figure 1 This is a top view of a vacuum environment single-drive clamp valve according to an embodiment of this application.

[0035] Figure 2 This is a schematic diagram illustrating the structure of the elastic core when it is opened, as shown in the embodiments of this application.

[0036] Figure 3 This is a schematic diagram illustrating the structure of the elastic core when it is closed, as shown in the embodiments of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Sealed cavity; 11. Vacuum suction port; 2. Elastic core; 21. Material inlet; 22. Material outlet; 3. Drive mechanism; 31. Drive cylinder; 32. Core pull lug; 33. Left pressure bar; 34. Right pressure bar; 4. Linkage assembly; 41. Mounting base; 42. Connecting rod; 43. Guide shaft; 5. Positioning rod; 6. Guide cylinder; 7. Pressure block; 8. Bolt. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0039] This application discloses a single-drive clamp valve for vacuum environments. (Refer to...) Figure 1-3 The vacuum environment single-drive clamp valve includes a sealed cavity 1, an elastic core 2 and a drive mechanism 3 are provided inside the sealed cavity 1; a vacuum suction port 11 is provided on the sealed cavity 1; the drive mechanism 3 is connected to the side wall of the elastic core 2 and is used to drive the side wall of the elastic core 2 to move inward to close or outward to open.

[0040] The top of the elastic core 2 is the material inlet 21, and the bottom of the elastic core 2 is the material outlet 22. This pinch valve is suitable for the following working environments: the material inlet 21 is at normal pressure, and the container connected to the material outlet 22 is in a vacuum environment with a maximum vacuum pressure of -0.095 MPa. This application uses the vacuum suction port 11 to perform vacuum suction on the sealing cavity 1, making the sealing cavity 1 reach the same vacuum pressure as the container at the material outlet 22. This ensures that the pressure inside and outside the elastic core 2 is the same, avoiding the enormous pressure experienced when the valve is opened. This prevents the drive mechanism 3 from forcibly driving the elastic core 2, thus avoiding damage to the elastic core 2 and wasting energy. This achieves the same operating environment as ordinary pinch valves, improving the service life of the pinch valve under high-sensitivity explosive conditions.

[0041] Reference Figure 1-3 The drive mechanism 3 includes a drive cylinder 31, a linkage assembly 4, a core pull lug 32, a left pressure bar 33, and a right pressure bar 34. The left pressure bar 33 and the right pressure bar 34 are both connected to the piston rod of the drive cylinder 31 through the linkage assembly 4. The core pull lug 32 is located on both sides of the elastic core 2 in the radial direction and is made of soft material. One end of the core pull lug 32 is fixedly connected to the outer wall of the elastic core 2, and the other end is installed on the left pressure bar 33 and the right pressure bar 34 respectively. The drive cylinder 31 drives the left pressure bar 33, the right pressure bar 34, and the core pull lugs 32 on both sides to move synchronously through the linkage assembly 4. The left pressure bar 33 and the right pressure bar 34 move in opposite directions.

[0042] When the clamp valve needs to be closed, that is, when the side wall of the elastic core 2 needs to be moved inward to close, the drive cylinder 31 is activated. The piston rod of the drive cylinder 31 extends and drives the left pressure bar 33 and the right pressure bar 34 to move closer to the elastic core 2 through the linkage assembly 4, thereby squeezing the side wall of the elastic core 2 inward to abut, thus closing the clamp valve.

[0043] When the pinch valve needs to be opened, i.e., when the side wall of the elastic core 2 needs to move outward to open, the drive cylinder 31 is activated. The piston rod of the drive cylinder 31 retracts and drives the left pressure bar 33 and right pressure bar 34 to reset via the linkage assembly 4. That is, the left pressure bar 33 and right pressure bar 34 are driven to move away from the elastic core 2. At the same time, the core pull lug 32 pulls the side wall of the elastic core 2, pulling the side wall of the elastic core 2 outward to reset, thus opening the pinch valve. According to the required feed rate in actual conditions, the stroke of the drive cylinder 31 can be controlled. Under the action of the linkage assembly 4, the left pressure bar 33, right pressure bar 34 and core pull lug 32 cooperate with each other to control the opening of the elastic core 2, thereby controlling the feed rate. The operation is simple and reliable.

[0044] Reference Figure 1-3 The linkage assembly 4 is housed within the sealed cavity 1. Enclosing the entire linkage mechanism within the sealed cavity reduces the number of vulnerable parts and leakage points, enhances sealing performance, and lowers maintenance costs during use. The linkage assembly 4 includes a mounting base 41, connecting rods 42, and guide shafts 43. One end of the mounting base 41 is fixedly connected to the piston rod of the drive cylinder 31, and the other end is fixedly connected to the right pressure bar 34. Connecting rods 42 are symmetrically arranged on both sides of the mounting base 41, and guide shafts 43 are also symmetrically arranged on both sides of the mounting base 41. One end of each connecting rod 42 is hinged to the mounting base 41, and the other end is hinged to the corresponding guide shaft 43. Two positioning rods 5 are fixedly installed within the sealed cavity 1, and the middle part of the connecting rod 42 is rotatably connected to the positioning rods 5 via a rotating shaft. A guide cylinder 6 is fixedly installed inside the sealed cavity 1 for the guide shaft 43 to pass through. The ends of the guide shafts 43 on both sides away from the connecting rod 42 are fixedly connected to the left pressure bar 33. The left pressure bar 33 and the right pressure bar 34 are arranged on both sides of the elastic core 2 in the radial direction.

[0045] When the left pressure bar 33, right pressure bar 34, and core pull lug 32 need to move synchronously, the drive cylinder 31 is activated. The piston rod of the drive cylinder 31 drives the mounting base 41 to move. On one hand, this directly acts on the right pressure bar 34, causing it to move; on the other hand, it drives the connecting rod 42 to rotate around its central axis, which in turn drives the guide shaft 43 to move linearly within the guide cylinder 6, thereby causing the left pressure bar 33 to move. Since one end of the core pull lug 32 is mounted on the left pressure bar 33 and right pressure bar 34, it can move synchronously with the left pressure bar 33 and right pressure bar 34.

[0046] The core pull lugs 32 are fixed to the left pressure bar 33 and the right pressure bar 34 respectively, and move together with the left pressure bar 33 and the right pressure bar 34. When the drive mechanism 3 drives the right pressure bar 34 to move to the left, the left pressure bar 33 moves to the right synchronously through the linkage component 4, thereby achieving the purpose of the left and right pressure bars 34 moving towards the center at the same time, so that the center line of the elastic core 2 always remains in the center position, and the pressure and tensile deformation on the left and right tube walls are consistent, reducing damage to the core.

[0047] Reference Figure 1-3 The guide shafts 43 on both sides pass through both ends of the right pressure bar 34. The linkage mechanism, constrained by multiple guide mechanisms, ensures that the left and right pressure bars 34 run on the same axis. The core pull lugs 32 are set on both sides of the thickness direction of the left pressure bar 33 and the right pressure bar 34, and are pressed onto the left pressure bar 33 and the right pressure bar 34 by the pressure block 7. Then, the pressure block 7 and the core pull lugs 32 are locked onto the left pressure bar 33 and the right pressure bar 34 by the bolts 8. The left pressure bar 33 and the right pressure bar 34 are both arc-shaped on the side facing the elastic core 2, so that the left pressure bar 33 and the right pressure bar 34 are in line contact with the elastic core 2, which reduces the tensile deformation of the tube wall during compression, enhances the sealing of the clamp valve closure, and improves the service life of the elastic core 2.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A single-drive clamp valve for vacuum environments, characterized in that: It includes a sealed cavity (1), and the sealed cavity (1) is provided with an elastic core (2) and a driving mechanism (3); The sealed cavity (1) is provided with a vacuum suction port (11); the driving mechanism (3) is connected to the side wall of the elastic core (2) and is used to drive the side wall of the elastic core (2) to move inward to close or outward to open.

2. The vacuum environment single-drive pinch valve according to claim 1, characterized in that: The drive mechanism (3) includes a drive cylinder (31), a linkage assembly (4), a core pull lug (32), a left pressure bar (33), and a right pressure bar (34). The left pressure bar (33) and the right pressure bar (34) are connected to the piston rod of the drive cylinder (31) through the linkage assembly (4). The core pull lug (32) is located on both sides of the elastic core (2) in the radial direction and is made of soft material. One end of the tube core pull lug (32) is fixedly connected to the outer wall of the elastic tube core (2), and the other end is installed on the left pressure bar (33) and the right pressure bar (34); the drive cylinder (31) drives the left pressure bar (33), the right pressure bar (34) and the tube core pull lugs (32) on both sides to move synchronously through the linkage component (4).

3. A vacuum environment single-drive clamp valve according to claim 2, characterized in that: The linkage component (4) includes a mounting base (41), a connecting rod (42), and a guide shaft (43); One end of the mounting base (41) is fixedly connected to the piston rod of the drive cylinder (31), and the other end of the mounting base (41) is fixedly connected to the right pressure bar (34); The connecting rods (42) are symmetrically arranged on both sides of the mounting base (41), and the guide shafts (43) are also symmetrically arranged on both sides of the mounting base (41). One end of each connecting rod (42) on both sides is hinged to the mounting base (41), and the other end of each connecting rod (42) on both sides is hinged to the corresponding guide shaft (43). Two positioning rods (5) are fixedly installed in the sealed cavity (1), and the middle part of the connecting rod (42) is rotatably connected to the positioning rod (5) through a rotating shaft. The sealed cavity (1) is fixedly provided with a guide cylinder (6) through which the guide shaft (43) passes. The ends of the guide shafts (43) on both sides away from the connecting rod (42) are fixedly connected to the left pressure bar (33). The left pressure bar (33) and the right pressure bar (34) are located on both sides of the elastic core (2) in the radial direction. The left pressure bar (33) and the right pressure bar (34) move in opposite directions.

4. A vacuum environment single-drive pinch valve according to claim 3, characterized in that: The linkage component (4) is disposed inside the sealed cavity (1).

5. A vacuum environment single-drive clamp valve according to claim 3, characterized in that: The guide shafts (43) on both sides pass through the two ends of the right pressure bar (34).

6. A vacuum environment single-drive pinch valve according to claim 2, characterized in that: The core pull lug (32) is located on both sides of the thickness direction of the left pressure bar (33) and the right pressure bar (34), and is fixed to the left pressure bar (33) and the right pressure bar (34) by pressure block (7) and bolt (8).

7. A vacuum environment single-drive pinch valve according to any one of claims 2-6, characterized in that: The left pressure bar (33) and the right pressure bar (34) are both arranged in an arc shape on the side facing the elastic core (2).

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