Pinch valve

Abstract

The utility model discloses a pinch valve which comprises a main body which is hollow, a material shortage part is formed on the side wall of the main body, and a pipe containing cavity is formed in the area, corresponding to the material shortage part, in the main body. The cover plate is arranged at the end, deviating from the pipe containing cavity, of the body. The piston rod axially penetrates through the cover plate, the outer diameter of the piston rod is smaller than the inner diameter of the main body, the first end, located in the main body, of the piston rod is connected with a pressure head, and the pressure head is in rotation-stopping fit with the inner wall of the main body; the piston rod can axially move relative to the main body so as to drive the pressure head to be far away from or close to the hose accommodating cavity to release or extrude the hose. The pinch valve is more labor-saving to operate, the pressing head can be easily pushed to the position where the hose is closed, and the pressing head can be more stably maintained in the preset direction, so that the hose can be more reliably extruded, and flowing stopping of fluid in the hose is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hose fluid control, in particular to a pinch valve. Background Art

[0002] As Figure 11-12 shown, there is a common manual pinch valve, including a handle device 109, a main body 102, a plunger 103 and a piston rod 104. The main body 102 has a transverse inner hole 105, and the piston rod 104 is slidably installed through the inner hole 105. The main body 102 further includes a receiving groove 106 for receiving a part of a flexible and compressible tube. The receiving groove 106 has a profiled surface 107. Corresponding to the closed position of the plunger 103, the profiled surface 107 is provided with two concave depressions 108 for receiving the compressible tube and the plunger 103. The piston rod 104 is slidably installed in the main body 102 and has a first end and a second end. The plunger 103 is integral with the second end of the piston rod 104 or can be detachably connected by a fixing screw. The first end of the piston rod 104 is connected to the handle device 109.

[0003] Rotating the handle device 109 and the piston rod 104, the piston rod 104 axially moves along the inner hole 105 of the main body 102, thereby pulling the plunger 103 away from the profiled surface 107 of the receiving groove 106, so that the manual pinch valve is in the open position. The handle device 109 pulls the plunger 103 close to the profiled surface 107 of the receiving groove 106, and the valve can be closed to stop the flow of fluid in the flexible tube in the receiving groove 106 or can be used to reduce the flow rate of the pipeline.

[0004] Rotating the handle device 109 drives the piston rod 104 to axially slide along the inner wall of the inner hole 105 of the main body 102. Since most of the area of the piston rod 104 contacts the inner wall of the inner hole 105 of the main body 102, the sliding contact area between the two is relatively large. And because it is necessary to limit the rotation of the plunger 103 in the receiving groove 106 to guide the plunger 103 to the stationary position on the concave depression 108 of the profiled surface 107, a washer 101 is also provided between the piston rod 104 and the inner wall of the inner hole 105 of the main body 102, which provides a smooth sliding fit between the piston rod 104 and the inner hole 105 of the main body 102, keeps the piston rod 104 in the main body 102, and keeps it in a predetermined position within the profiled surface 107.

[0005] Since the sliding contact area between the piston rod 104 and the inner wall of the inner hole 105 of the main body 102 is relatively large, the sliding friction force is relatively large. Moreover, a washer 101 is provided between the two. Because the rotation of the piston rod 104 and the plunger 103 relative to the main body 102 needs to be restricted, the assembly of the piston rod 104 and the main body 102 through the washer 101 is relatively tight. Then, during the sliding process of the piston rod 104 along the inner wall of the inner hole 105 of the main body 102, the further increased friction force makes the rotation operation of the handle device 109 time-consuming and laborious when the pinch valve is manually controlled. More importantly, due to the excessive effort required for the operation, it may occur that the plunger 103 cannot reach the closed position and cannot completely stop the fluid flow in the hose.

[0006] Therefore, it is necessary to further improve the assembly structure between the piston rod 104 and the main body 102 so that the rotation operation of the handle device 109 is more labor-saving and ensure that the plunger 103 can reach the closed position. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, the present utility model provides a pinch valve, which is labor-saving in operation, can reliably squeeze a hose, and ensure the interruption of fluid flow in the hose.

[0008] The technical solution adopted by the present utility model to solve its technical problems is as follows:

[0009] A pinch valve, comprising:

[0010] A main body, which is hollow inside, has a material shortage portion formed on its side wall, and a pipe receiving cavity is formed in the area of the main body corresponding to the material shortage portion;

[0011] A cover plate, which is provided at the end of the main body facing away from the pipe receiving cavity;

[0012] A piston rod, which axially penetrates through the cover plate, and its outer diameter is smaller than the inner diameter of the main body. A pressing head is connected to the first end of the piston rod located inside the main body, and the pressing head is in non-rotating fit with the inner wall of the main body;

[0013] The piston rod can axially move relative to the main body, thereby driving the pressing head to move away from or close to the pipe receiving cavity to release or squeeze the hose.

[0014] The pinch valve of the present utility model changes the structure of the main body itself. The main body is designed to be hollow inside, and the piston rod passes through the cover plate and extends into the hollow interior of the main body. Moreover, the outer diameter of the piston rod is smaller than the inner diameter of the main body, so that there is a gap between the piston rod and the inner wall of the main body. The outer wall of the piston rod only contacts the cover plate, and the contact area between the piston rod and the cover plate is greatly reduced. During the axial movement of the piston rod relative to the cover plate and the main body, the sliding friction of the piston rod is greatly reduced, that is, the friction to be overcome when moving the piston rod is significantly reduced. During the process of controlling the pinch valve, the operating force for driving the piston rod to move or rotate becomes smaller, making the operation more time-saving and labor-saving. At the same time, due to the reduction of the sliding friction of the piston rod and the more labor-saving operation, it can ensure that each time the operation is performed, the piston rod can drive the pressing head to reach the closed position, ensuring the interruption of the fluid flow in the hose and preventing the situation where the pressing head fails to reach the closed position and cannot completely interrupt the fluid flow in the hose due to overly strenuous operation.

[0015] The anti-rotation structure in the pinch valve is located between the pressing head and the main body, further reducing the sliding friction of the piston rod and increasing the convenience of operating the piston rod. The anti-rotation structure is accurately arranged on the pressing head that truly needs anti-rotation, so that the anti-rotation structure is concentrated on the pressing head, ensuring that the pressing head maintains a preset orientation and having a better anti-rotation effect on the pressing head. In addition, since the anti-rotation structure is not arranged between the outer periphery of the piston rod and the cover plate, it will not additionally increase the friction that needs to be overcome when moving the piston rod, that is, it reduces the external force required to drive the piston rod to move.

[0016] In summary, the pinch valve of the present utility model is more labor-saving in operation, is easy to ensure that the pressing head is pushed to the position of closing the hose, and because the pressing head can be more stably maintained in the preset orientation, it can form a stronger extrusion on the hose, ensuring the interruption of the fluid flow in the hose.

[0017] Further, the pressing head includes a connecting section connected to the first end of the piston rod and an extrusion section for extruding the hose. The cross-section of the extrusion section gradually decreases in the direction away from the connecting section.

[0018] Both the connecting section and the main body are cylindrical, and the outer diameter of the connecting section is approximately equal to the inner diameter of the hollow interior of the main body. Thus, during the movement of the pressing head relative to the main body, its outer wall can move against the inner wall of the main body, ensuring that the pressing head moves translationally along the axis of the main body and avoiding deviation, which is beneficial for the pressing head to accurately extrude the hose. The design of the extrusion section reduces its contact area with the extruded part of the hose, increases the extrusion strength on the hose, and the cross-sectional area of the extrusion section is smaller than that of the connecting section, just providing a space for the deformation of the extruded part of the hose. This avoids the situation where the hose cannot be completely closed due to the lack of accommodation space for the deformation after being extruded, resulting in the incomplete interruption of the fluid flow in the hose. It is beneficial for the extrusion section to stably and effectively extrude the hose, ensuring the interruption of the fluid flow in the hose.

[0019] Further, the extrusion section has a first extrusion surface at its end, and the inner bottom of the main body has a second extrusion surface, and the first extrusion surface and the second extrusion surface are arranged parallel and facing each other.

[0020] The arrangement of the first extrusion surface and the second extrusion surface that are parallel and facing each other can reduce the contact area between the extrusion section, the main body and the hose, and ensure that the hose can be clamped and extruded, so that the fluid in the hose is effectively stopped from flowing, and avoid the deviation of the first extrusion surface and the second extrusion surface, resulting in the inability to completely close the hose and the inability to effectively stop the fluid flow during the extrusion of the hose.

[0021] Further, a pressure strip is provided on the bottom wall of the pipe receiving cavity, and its end surface forms the second extrusion surface.

[0022] The pressure strip extends from the inner bottom of the main body towards the direction of the pressing head. Thus, when the first extrusion surface and the second extrusion surface cooperate to squeeze the hose towards each other, a part of the hose wall after being squeezed by the pressure strip can deform and enter the space between the side wall of the pressure strip and the inner bottom surface of the main body, which is conducive to the timely deformation of the squeezed part of the hose and ensures that the hose is effectively squeezed by the first extrusion surface and the second extrusion surface, thereby stopping the flow of the fluid in the hose.

[0023] Further, the length of the first extrusion surface and the length of the second extrusion surface are both equal to the inner diameter of the main body; and / or, the first extrusion surface and the second extrusion surface are curved surfaces.

[0024] Setting the length of the first extrusion surface and the length of the second extrusion surface to be equal to the inner diameter of the hollow interior of the main body can ensure that the entire radial direction of the hose placed in the soft receiving cavity is squeezed by the first extrusion surface and the second extrusion surface towards each other, avoiding that the outer diameter of the hose is greater than the length of the first extrusion surface or the second extrusion surface, resulting in the inability to completely squeeze the hose in the radial length direction and ensuring that the fluid in the hose is effectively stopped from flowing; compared with the planar design, the curved surface design can increase the contact area between the first extrusion surface, the second extrusion surface and the hose to a certain extent, avoid excessive extrusion strength and damage the hose; the curved surface design can also make the first extrusion surface and the second extrusion surface fit more closely to the outer wall of the hose, making the extrusion effect on the hose more stable, ensuring that the hose deforms stably after being squeezed, and further ensuring that the flow of the fluid in the hose is effectively stopped.

[0025] Further, the connecting section is cylindrical and has a concentric and coaxial hollow area, and the first end of the piston rod is inserted into the hollow area and axially fixed.

[0026] The piston rod is inserted into the hollow area, so that the piston rod, the hollow area and the connecting section are concentric and coaxial. Thus, when the piston rod drives the connecting section to axially move relative to the main body, the forces on all circumferential parts of the pressing head are relatively balanced, and the first pressing surface will not deviate during the translational process relative to the main body. Subsequently, the extrusion forces on all radial parts of the hose are relatively balanced, ensuring that the fluid in the hose can stop flowing.

[0027] Furthermore, an annular groove is formed on the outer wall of the first end of the piston rod, and the connecting section has a through hole. The clamping part passes through the through hole and partially extends into the annular groove to achieve the axial fixation of the piston rod and the pressing head; and / or, the axial length of the hollow area is h, and the length of the connecting section is H, then h / H is 0.8 - 0.9.

[0028] With such a setting, the processing and manufacturing are relatively convenient, and while not affecting the circumferential rotation of the piston rod, it ensures that a stable axial fixed assembly can be formed between the piston rod and the pressing head; if the axial length ratio of the hollow area to the connecting section is less than 0.8, it means that the axial length of the hollow area is too short. At this time, the connection length between the piston rod and the connecting section is short, and the connection stability between the two is poor, and a relatively large operating force is required to drive the pressing head to move relative to the main body; if the axial length ratio of the hollow area to the connecting section is greater than 0.9, it means that the axial length of the hollow area is too large. Correspondingly, the length of the piston rod inserted into the hollow area is also relatively long, so the total length of the piston rod is relatively long, increasing the material consumption of the piston rod, and a hollow area with a larger length needs to be machined in the area of the pressing head corresponding to the connecting section, which is more time-consuming.

[0029] Furthermore, the main body has an axially extending limiting clamping groove, and the pressing head is provided with a slot. The anti-rotation screw passes through the limiting clamping groove and extends into the slot to achieve the anti-rotation cooperation between the pressing head and the side wall of the main body, and the anti-rotation screw can axially move along with the pressing head in the limiting clamping groove.

[0030] Opening the limiting clamping groove on the side wall of the main body and forming the slot on the outer periphery of the pressing head are relatively convenient for processing. Selecting an anti-rotation screw with an outer diameter adapted to the width of the limiting clamping groove can effectively ensure that there is no circumferential deflection between the pressing head and the main body, and the anti-rotation cooperation effect is good. Moreover, the limiting clamping groove limits the axial movement stroke of the anti-rotation screw, avoiding excessive upward movement of the pressing head, and the controllability of the axial movement of the pressing head is higher.

[0031] Furthermore, an O-ring is press-fitted between the outer wall of the pressing head and the inner wall of the main body to achieve the anti-rotation cooperation between the pressing head and the side wall of the main body.

[0032] The O-ring can enhance the anti-rotation effect between the pressing head and the main body. Especially when the O-ring is assembled on the connecting section of the pressing head, the anti-rotation effect is better.

[0033] Furthermore, the piston rod is threaded through a cover plate and has a second end located outside the main body, and the second end is connected to a rotating handle.

[0034] The piston rod is designed to be rotatably connected to the cover plate, so that when the piston rod drives the pressure head to move axially to the target position, the external force is stopped and the pressure head can stay in the state of squeezing the hose and stopping the flow of fluid, which makes the operation more convenient; the setting of the rotating handle makes it convenient to apply external force to rotate the piston rod, and the structural design is more reasonable.

[0035] The beneficial effects of the utility model are as follows: the structure of the main body itself is changed, the main body is designed to be hollow inside, the piston rod passes through the cover plate and extends into the hollow inside of the main body, and the outer diameter of the piston rod is smaller than the inner diameter of the main body, so that the piston rod is spaced from the inner wall of the main body, and the outer wall of the piston rod only contacts the cover plate, and the contact area between the two is greatly reduced. In the process of axial movement of the piston rod relative to the cover plate and the main body, the sliding friction of the piston rod is greatly reduced, that is, the friction that needs to be overcome to move the piston rod is greatly reduced. In the process of controlling the pinch valve, the operating force to drive the piston rod to move or rotate becomes smaller, making the operation more time-saving and labor-saving; at the same time, since the sliding friction of the piston rod is reduced and the operation is more labor-saving, it can be ensured that the piston rod can drive the pressure head to the closed position each time the operation is performed, so as to ensure that the fluid in the hose stops flowing, and prevent the pressure head from not reaching the closed position and failing to completely stop the flow of the fluid in the hose due to excessive laborious operation;

[0036] The anti-rotation structure in the pinch valve is located between the pressure head and the main body, which further reduces the sliding friction of the piston rod and increases the convenience of piston rod operation; the anti-rotation structure is accurately set on the pressure head that really needs to be anti-rotated, so that the anti-rotation structure is concentrated on the pressure head, ensuring that the pressure head is maintained in a preset position, and the anti-rotation effect of the pressure head is better; in addition, since the anti-rotation structure is not set between the outer periphery of the piston rod and the cover plate, the friction that needs to be overcome by the moving piston rod will not be increased, that is, the external force required to drive the piston rod to move is reduced;

[0037] In summary, the pinch valve of the utility model is easier to operate, and it is easy to ensure that the pressure head is pushed to the position of closing the hose. Moreover, because the pressure head can be more stably maintained in the preset position, it can form a more reliable squeeze on the hose, ensuring that the flow of the fluid in the hose is stopped;

[0038] The design of the connecting section ensures that the pressure head can translate along the axis direction of the main body to avoid deviation, which is conducive to the accurate squeezing of the hose by the pressure head; the design of the squeezing section reduces the contact area between the pressure head and the squeezed part of the hose, increases the squeezing strength of the hose, and the squeezing section has a smaller cross-sectional area than the connecting section, which just provides space for the deformation of the squeezed part of the hose, avoiding the inability to completely close the hose due to the lack of accommodation after the hose is squeezed, resulting in the inability to completely stop the fluid in the hose, which is conducive to the squeezing section to squeeze the hose stably and effectively, ensuring that the fluid in the hose stops flowing;

[0039] The length of the first extrusion surface and the length of the second extrusion surface are set to be equal to the inner diameter of the hollow interior of the main body, which can ensure that the entire radial direction of the hose placed in the soft accommodating cavity is squeezed by the first extrusion surface and the second extrusion surface, thereby avoiding the outer diameter of the hose being greater than the length of the first extrusion surface or the second extrusion surface, which causes the hose to be unable to be completely squeezed in the radial length direction, thereby ensuring that the flow of the fluid in the hose is effectively stopped; compared with the flat design, the curved design can increase the contact area between the first extrusion surface, the second extrusion surface and the hose to a certain extent, thereby avoiding excessive extrusion strength and crushing the hose; the curved design can also make the first extrusion surface and the second extrusion surface fit the outer wall of the hose more closely, making the squeezing effect on the hose more stable, thereby ensuring that the deformation of the hose after being squeezed is stable, thereby ensuring that the flow of the fluid in the hose is effectively stopped. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The present invention is a stereoscopic diagram of a pinch valve provided by the present invention.

[0041] Figure 2 A cross-sectional view of the pinch valve provided by the utility model Figure 1 .

[0042] Figure 3 A cross-sectional view of the pinch valve provided by the utility model Figure 2 .

[0043] Figure 4 for Figure 3 A magnified view of the structure in Figure 2.

[0044] Figure 5 A cross-sectional view of the pinch valve provided by the utility model Figure 3 , in this case the piston rod and the screw handle are omitted.

[0045] Figure 6 This is a front view of the pinch valve provided by the utility model.

[0046] Figure 7 The figure is a side view of the pinch valve provided by the utility model.

[0047] Figure 8 This is a rear view of the pinch valve provided by the utility model.

[0048] Figure 9 The top view of the pinch valve provided by the present utility model in cooperation with a hose.

[0049] Figure 10 The cross-sectional view of the pinch valve provided by the present utility model in cooperation with a hose.

[0050] Figure 11 The front view of the existing manual pinch valve.

[0051] Figure 12 is Figure 11 the A-A cross-sectional view in

[0052] Wherein, 1 - main body, 11 - material shortage part, 12 - pipe accommodating cavity, 13 - limit card slot, 2 - cover plate, 21 - hole, 3 - piston rod, 31 - annular groove, 32 - rotating handle, 331 - first end of the piston rod, 332 - second end of the piston rod, 4 - pressing head, 41 - connecting section, 411 - hollow area, 412 - through hole, 42 - extrusion section, 421 - first extrusion surface, 43 - slot, 5 - hose, 6 - pressing strip, 61 - second extrusion surface, 7 - clamping part, 8 - anti-rotation screw, 9 - sealing ring. Detailed implementation manners

[0053] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0054] As Figures 1-8 shown, a pinch valve includes a hollow main body 1, a cover plate 2 provided at the end of the main body 1, a piston rod 3 axially passing through the cover plate 2, and a pressing head 4 connected to the first end 331 of the piston rod 3, and the pressing head 4 is in anti-rotation fit with the inner wall of the main body 1. A material shortage part 11 is formed on the side wall of the main body 1, and a pipe accommodating cavity 12 is formed in the area of the main body 1 corresponding to the material shortage part 11. The material shortage part 11 is the missing part of the side wall of the main body 1, which enables the hollow interior of the main body 1 to communicate with the outside, so that the hose 5 can extend into the pipe accommodating cavity 12 through the material shortage part 11 and pass through the material shortage part 11 to pass through the main body 1.

[0055] As Figure 6 、 Figure 7As shown, in this embodiment, the material shortage part 11 involves most of the circumferential direction of the cylindrical side wall of the main body 1, and generally includes two radially opposite parts and a connecting part located between the two circumferential parts and connecting the two circumferential parts together. Among them, the areas of the two radially opposite parts are larger to accommodate the uncompressed part of the hose 5, while the connecting part has a smaller area. The hose 5 is slightly squeezed and laterally pushed into the pipe receiving cavity 12 through the above-mentioned connecting part, and can prevent the hose 5 from sliding out laterally through the above-mentioned connecting part at will, ensuring that the hose 5 always remains in the pipe receiving cavity 12. Of course, the side wall of the main body 1 also includes a solid part corresponding to the pipe receiving cavity 12.

[0056] The cover plate 2 is arranged at the end of the main body 1 facing away from the pipe receiving cavity 12. The outer diameter of the piston rod 3 is smaller than the inner diameter of the main body 1. It includes the above-mentioned first end 331 and a second end 332 opposite to the first end 331. The first end 331 and the pressing head 4 are located inside the main body 1, and the second end 332 passes through the cover plate 2 and is located outside the main body 1. The piston rod 3 can axially move relative to the cover plate 2 and the main body 1, and then drive the pressing head 4 to move away from or close to the pipe receiving cavity 12, so as to release or squeeze the hose 5, thereby reducing or increasing the pressure on the hose 5, and finally realizing the suspension or restart of the fluid flow in the hose 5.

[0057] The pinch valve in the present utility model changes the structure of the main body 1 itself. The main body 1 is designed to be hollow inside. The piston rod 3 passes through the hole 21 of the cover plate 2 and extends into the hollow interior of the main body 1. And the outer diameter of the piston rod 3 is smaller than the inner diameter of the main body 1. Thus, a gap is formed between the piston rod 3 and the inner wall of the main body 1. In other words, the piston rod 3 does not contact the main body 1. The outer wall of the piston rod 3 only contacts the side wall of the hole 21 of the cover plate 2. Moreover, in this embodiment, the outer diameter of the piston rod 3 is much smaller than the inner diameter of the main body 1. Therefore, the contact area between the piston rod 3 and the cover plate 2 is greatly reduced. During the axial movement of the piston rod 3 relative to the cover plate 2 and the main body 1, the sliding friction force of the piston rod 3 is greatly reduced, that is, the friction force that needs to be overcome to move the piston rod 3 is greatly reduced. During the process of controlling the pinch valve, the operating force for driving the piston rod 3 to move or rotate becomes smaller, making the operation more time-saving and labor-saving; at the same time, due to the reduction of the sliding friction force of the piston rod 3 and the more labor-saving operation, it can be ensured that every time the operation is performed, the piston rod 3 can drive the pressing head 4 to reach the closed position, ensuring the suspension of the fluid flow in the hose 5 and preventing the situation that the pressing head 4 does not reach the closed position and cannot completely suspend the fluid flow in the hose 5 due to the operation being too laborious;

[0058] Furthermore, the anti-rotation structure in the clamp valve is located between the pressure head 4 and the main body 1, instead of setting the anti-rotation structure between the piston rod and the main body as in the prior art. Such a setting further reduces the sliding friction of the piston rod 3 and increases the convenience of operating the piston rod 3; moreover, the anti-rotation structure is directly set between the pressure head 4 and the main body 1, and there is no need to set a anti-rotation structure between the piston rod 3 and the main body 1, that is, the anti-rotation structure is accurately set on the pressure head 4 that really needs to be anti-rotated, and the anti-rotation of the piston rod 3 is omitted, so that the anti-rotation structure is concentrated on the pressure head 4, ensuring that the pressure head 4 maintains a preset orientation, and the anti-rotation effect on the pressure head 4 is better; in addition, since the anti-rotation structure is not set between the outer periphery of the piston rod 3 and the side wall of the hole 21 on the cover plate 2, the friction that needs to be overcome to move the piston rod 3 will not be increased, that is, the external force required to drive the piston rod 3 to move is reduced.

[0059] In summary, the clamp valve of the utility model is easier to operate and can easily ensure that the pressure head 4 is pushed to the position of closing the hose 5. Moreover, since the pressure head 4 can be more stably maintained in the preset position, the hose 5 can be squeezed more reliably to ensure that the flow of the fluid in the hose 5 is stopped.

[0060] The pressure head 4 includes a connecting section 41 connected to the first end 331 of the piston rod 3, and an extrusion section 42 for extruding the hose 5. More specifically, the connecting section 41 and the main body 1 are both cylindrical, and the outer diameter of the connecting section 41 is roughly equal to the inner diameter of the hollow interior of the main body 1. Therefore, when the pressure head 4 moves relative to the main body 1, its outer wall can move against the inner wall of the main body 1 to ensure that the pressure head 4 translates along the axial direction of the main body 1 to avoid offset, which is conducive to the pressure head 4 accurately extruding the hose 5.

[0061] The cross section of the extrusion section 42 gradually decreases in the direction away from the connection section 41. In this embodiment, the extrusion section 42 is formed by cutting parts symmetrically obliquely from both sides of a cylinder. The extrusion section 42 is designed in this way to reduce the contact area between the extrusion section 42 and the extruded part of the hose 5, increase the extrusion strength of the extrusion section 42 on the hose 5, and the extrusion section 42 has a smaller cross-sectional area than the connection section 41, which just provides a space for the deformation of the hose 5 at the extrusion section, avoiding the hose 5 being unable to be completely closed due to the deformation after being squeezed, resulting in the fluid in the hose 5 not being completely stopped, which is conducive to the extrusion section 42 to squeeze the hose 5 stably and effectively, and ensure that the fluid in the hose 5 stops flowing.

[0062] More specifically, the extrusion section 42 has a first extrusion surface 421 at its end. A pressure strip 6 is provided on the inner bottom of the main body 1 and the bottom wall of the tube receiving cavity 12. The pressure strip 6 extends towards the direction where the pressing head 4 is located and forms a second extrusion surface 61 on its end surface. The first extrusion surface 421 and the second extrusion surface 61 are arranged parallel and facing each other. Thus, the first extrusion surface 421 and the second extrusion surface 61 can face and clamp the hose 5 to extrude it, so that the fluid in the hose 5 is effectively stopped from flowing, and to avoid the first extrusion surface 421 and the second extrusion surface 61 deviating from each other, resulting in the inability to completely close the hose 5 and causing the fluid in the hose 5 to not be effectively stopped during the extrusion process. In this embodiment, the lengths of the first extrusion surface 421 and the second extrusion surface 61 are both equal to the inner diameter of the hollow interior of the main body 1.

[0063] The pressure strip 6 extends from the inner bottom of the main body 1 towards the direction where the pressing head 4 is located. Thus, when the first extrusion surface 421 and the second extrusion surface 61 cooperate to extrude the hose 5 towards each other, the part of the tube wall of the hose 5 after being extruded by the pressure strip 6 can deform and enter the space between the side wall of the pressure strip 6 and the inner bottom surface of the main body 1, which is beneficial to the timely deformation of the extruded part of the hose 5 and ensures that the hose 5 is effectively extruded by the first extrusion surface 421 and the second extrusion surface 61, thereby stopping the flow of the fluid in the hose 5.

[0064] In actual application scenarios, generally, the outer diameter of the hose 5 is equal to or less than the inner diameter of the main body 1. Setting the lengths of the first extrusion surface 421 and the second extrusion surface 61 to be equal to the inner diameter of the hollow interior of the main body 1 can ensure that the entire radial direction of the hose 5 placed in the soft receiving cavity 12 is extruded by the first extrusion surface 421 and the second extrusion surface 61 towards each other, and avoid the outer diameter of the hose 5 being greater than the lengths of the first extrusion surface 421 or the second extrusion surface 61, resulting in the hose 5 not being completely extruded in the radial length direction, and ensuring that the fluid in the hose 5 is effectively stopped from flowing.

[0065] More specifically, the first extrusion surface 421 and the second extrusion surface 61 are curved surfaces. Compared with the design of a flat surface, the curved surface design can, to a certain extent, increase the contact area between the first extrusion surface 421, the second extrusion surface 61 and the hose 5, avoid excessive extrusion strength and crushing the hose 5; at the same time, as Figure 10 shown, the curved surface design can also make the first extrusion surface 421 and the second extrusion surface 61 fit more closely to the outer wall of the hose 5, making the extrusion effect on the hose 5 more stable, ensuring that the hose 5 deforms stably after being extruded, and further ensuring that the flow of the fluid in the hose 5 is effectively stopped. In actual applications, the curved surface can be a cylindrical curved surface or a spherical curved surface.

[0066] As Figures 3-5As shown, the connecting section 41 is cylindrical and has a concentric and coaxial hollow area 411. The first end 331 of the piston rod 3 is inserted into the hollow area 411 and axially fixed. Specifically, the outer diameter of the piston rod 3 is approximately equal to the inner diameter of the hollow area 411. An annular groove 31 is formed on the outer wall of the first end 331 of the piston rod 3. The connecting section 41 has a through hole 412 extending along its radial direction. The end of the through hole 412 communicates with the hollow area 411. The clamping member 7 can pass through the through hole 412 and partially extend into the annular groove 31, thereby realizing the axial fixed assembly of the piston rod 3 and the pressing head 4 and preventing the piston rod 3 from axially disengaging from the connecting section 41. At the same time, the piston rod 3 can freely rotate circumferentially relative to the pressing head 4.

[0067] The piston rod 3 is inserted into the hollow area 411, making the piston rod 3, the hollow area 411, and the connecting section 41 concentric and coaxial. Thus, when the piston rod 3 drives the connecting section 41 to axially move relative to the main body 1, the forces on all circumferential parts of the pressing head 4 are relatively balanced. During the translational process of the first extrusion surface 421 relative to the main body 1, no offset will occur, and then the extrusion forces on all radial parts of the hose 5 are relatively balanced, ensuring that the fluid in the hose 5 can stop flowing. An annular groove 31 is formed on the outer wall of the piston rod 3, and the connecting section 41 forms a through hole 412 penetrating its radial direction. The processing and manufacturing are relatively convenient. And while not affecting the circumferential rotation of the piston rod 3, it ensures that a stable axial fixed assembly can be formed between the piston rod 3 and the pressing head 4, ensuring that the pressing head 4 can axially move synchronously with the piston rod 3. In addition, the outer diameter of the piston rod 3 is adapted to the inner diameter of the hollow area 411. Thus, after the piston rod 3 and the connecting section 41 are assembled, there will be no radial shaking between the two, and the assembly is stable.

[0068] As Figure 5 shown, the axial length of the hollow area 411 is h, and the length of the connecting section 41 is H. Then h / H is 0.8 - 0.9. If the axial length ratio of the hollow area 411 to the connecting section 41 is less than 0.8, it means that the axial length of the hollow area 411 is too short. At this time, the connection length between the piston rod 3 and the connecting section 41 is short, and the connection stability between the two is poor. Moreover, a relatively large operating force is required to drive the pressing head 4 to move relative to the main body 1. If the axial length ratio of the hollow area 411 to the connecting section 41 is greater than 0.9, it means that the axial length of the hollow area 411 is too large. Correspondingly, the length of the piston rod 3 inserted into the hollow area 411 is also relatively long, so the total length of the piston rod 3 is relatively long, increasing the material consumption of the piston rod 3. And a hollow area 411 with a larger length needs to be machined in the area of the pressing head 4 corresponding to the connecting section 41, which is more time-consuming.

[0069] In this embodiment, the piston rod 3 is threadedly inserted through the cover plate 2. Specifically, the outer wall of the piston rod 3 has an external thread, and the inner wall of the hole 21 of the cover plate 2 is provided with an internal thread. The rotation of the piston rod 3 drives the axial movement of the pressing head 4. To facilitate the rotation of the piston rod 3, a rotating handle 32 is connected to the second end 332 of the piston rod 3.

[0070] To prevent the pressing head 4 from rotating relative to the main body 1, an anti-rotation structure is provided between the main body 1 and the pressing head 4. This anti-rotation structure can be any structure in the prior art, and specific details are not limited. In this embodiment, as Figure 8 shown, the main body 1 has a limiting slot 13 extending axially, as Figure 3 shown, the pressing head 4 is provided with a slot 43. The anti-rotation screw 8 passes through the limiting slot 13 and extends into the slot 43, thereby realizing the anti-rotation cooperation between the pressing head 4 and the side wall of the main body 1. And the anti-rotation screw 8 can move axially along the limiting slot 13 with the pressing head 4. Forming the limiting slot 13 on the side wall of the main body 1 and forming the slot 43 on the outer periphery of the pressing head 4 is relatively convenient for processing. Selecting an anti-rotation screw 8 with an outer diameter adapted to the width of the limiting slot 13 can effectively ensure that there is no circumferential deflection between the pressing head 4 and the main body 1, and the anti-rotation cooperation effect is good. Moreover, the limiting slot 13 limits the axial movement stroke of the anti-rotation screw 8, avoiding excessive upward movement of the pressing head 4 and providing higher controllability for the axial movement of the pressing head 4.

[0071] The slot 43 is generally provided between 40% and 60% of the axial length of the pressing head 4. For example, it can be at 50% of the axial length of the pressing head 4, and the anti-rotation effect is better.

[0072] In this embodiment, as Figure 3 shown, the slot 43 and the through hole 412 are located in the same axial section of the pressing head 4. The through hole 412 is located above the slot 43 axially. Specifically, the through hole 412 is provided in the connecting section 41 of the pressing head 4, and the slot 43 can be provided in the connecting section 41 of the pressing head 4 or in the extrusion section 42 of the pressing head 4. More specifically, the slot 43 and the through hole 412 are located in the axial section passing through the radial center of the first extrusion surface 421. At this time, the limiting slot 13 can be arranged to avoid the material-deficient part 11, so that the extension length of the limiting slot 13 is not limited.

[0073] Generally speaking, the axial length of the connecting section 41 of the pressing head 4 is less than the axial length of the extrusion section 42. By arranging the slot 43 and the through hole 412 in the axial section passing through the radial center of the first extrusion surface 421, the slot 43 can be arranged at half of the overall axial height of the pressing head 4, enabling the anti-rotation structure to better play the anti-rotation role between the pressing head 4 and the main body 1.

[0074] The anti-rotation structure can be the above-mentioned separate structure. The anti-rotation structure can also include a sealing ring 9 that is press-fitted between the outer wall of the pressing head 4 and the inner wall of the main body 1. The sealing ring 9 is located axially above the slot 43, and it can enhance the anti-rotation effect between the pressing head 4 and the main body 1. Especially when the sealing ring 9 is assembled on the connecting section 41 of the pressing head 4, the anti-rotation effect is better.

[0075] Setting the anti-rotation structure can ensure that the pressing head 4 moves up and down along the axis of the main body 1 without rotating, so as to ensure that during the movement, the first pressing surface 421 and the second pressing surface 61 can remain facing each other, forming a squeezing effect on the same radial direction of the hose 5, and ensuring that the fluid in the hose 5 can be completely stopped.

[0076] The assembly process of the pinch valve is as follows: Use the clamping part 7 to pass through the through hole 412 and extend into the annular groove 31 of the piston rod 3 to achieve the axial fixed assembly of the piston rod 3 and the pressing head 4; then insert the pressing head 4 with the anti-rotation sealing ring 9 and the piston rod 3 as a whole into the main body 1, the cover plate 2 is sleeved on the outer circumference of the piston rod 3 and fixedly assembled with the main body 1, and the anti-rotation screw 8 passes through the limit card slot 13 on the side wall of the main body 1 and then extends into the slot 43 to achieve the anti-rotation fit between the main body 1 and the pressing head 4. Finally, the rotary handle 32 is fixedly assembled at the second end 332 of the piston rod 3.

[0077] During use: Insert the hose 5 into the pipe receiving cavity 12 from the material shortage part 11 and pass through the main body 1, so that the radial direction of the hose 5 is parallel to the first pressing surface 421 and the second pressing surface 61;

[0078] Apply an external force to rotate the piston rod 3 by the rotary handle 32. Under the action of the external thread of the piston rod 3 and the internal thread of the hole 21 of the cover plate 2, and under the anti-rotation fit action of the limit card slot 13 and the anti-rotation screw 8, the piston rod 3 moves downward relative to the cover plate 2 and the main body 1, driving the pressing head 4 to move downward along the axis of the main body 1, so that the first pressing surface 421 moves downward to contact and squeeze the hose 5. At the same time, the second pressing surface 61 of the pressing strip 6 also squeezes the hose 5. Under the mutual squeezing action of the first pressing surface 421 and the second pressing surface 61, the fluid in the hose 5 is completely stopped.

[0079] In the above embodiment, the piston rod 3 rotates to drive the pressing head 4 to translate relative to the main body 1. Of course, in other embodiments, it can also be that the piston rod 3 directly translates relative to the cover plate 2, driving the pressing head 4 to translate axially relative to the main body 1. At this time, the pressing head 4 can also approach the pipe receiving cavity 12 to achieve the opposite squeezing of the first pressing surface 421 and the second pressing surface 61 on the hose 5. In practical applications, as long as an external force is applied to the piston rod 3, it can ensure the stopping of the fluid flow in the hose 5.

[0080] Whether rotating the piston rod 3 or translating the piston rod 3, the external force can be manual or electric, and specific restrictions are not made.

[0081] The above specific embodiments are used to explain the present utility model, rather than to limit the present utility model. Any modification and change made to the present utility model within the spirit and scope of protection of the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. A pinch valve, characterized in that, Comprising: A main body, which is hollow inside, with a material shortage portion formed on its side wall, and a tube accommodating cavity formed in the area of the main body corresponding to the material shortage portion; A cover plate provided at the end of the main body facing away from the tube accommodating cavity; A piston rod axially passing through the cover plate, the outer diameter of which is smaller than the inner diameter of the main body. A pressing head is connected to the first end of the piston rod located inside the main body, and the pressing head is in anti-rotation fit with the inner wall of the main body; The piston rod can axially move relative to the main body, thereby driving the pressing head away from or close to the tube accommodating cavity to release or squeeze the hose.

2. The pinch valve according to claim 1, characterized in that: The pressing head includes a connecting section connected to the first end of the piston rod and a pressing section for squeezing the hose, and the cross-section of the pressing section gradually decreases in the direction away from the connecting section.

3. The pinch valve according to claim 2, characterized in that: The pressing section has a first pressing surface at the end, and the inner bottom of the main body has a second pressing surface, and the first pressing surface and the second pressing surface are arranged parallel and facing each other.

4. The pinch valve according to claim 3, wherein: A pressing strip is provided on the bottom wall of the tube accommodating cavity, and the end surface thereof forms the second pressing surface.

5. The pinch valve according to claim 4, characterized in that: The length of the first pressing surface and the length of the second pressing surface are both equal to the inner diameter of the main body; and / or, the first pressing surface and the second pressing surface are curved surfaces.

6. The pinch valve according to claim 2, wherein: The connecting section is cylindrical and has a concentric and coaxial hollow area. The first end of the piston rod is inserted into the hollow area and axially fixed.

7. The pinch valve according to claim 6, wherein: An annular groove is formed on the outer wall of the first end of the piston rod. The connecting section has a through hole, and a clamping member passes through the through hole and partially extends into the annular groove to achieve axial fixation of the piston rod and the pressing head; and / or, the axial length of the hollow area is h, and the length of the connecting section is H, then h / H is 0.8 - 0.

9.

8. The pinch valve according to claim 1, characterized in that: The main body has an axially extending limit card slot, and the pressing head is provided with a slot. A non-rotating screw passes through the limit card slot and extends into the slot to achieve anti-rotation fit between the pressing head and the side wall of the main body, and the non-rotating screw can axially move along the limit card slot with the pressing head.

9. The pinch valve according to claim 1 or 8, characterized in that: An O-ring is press-fitted between the outer wall of the pressing head and the inner wall of the main body to achieve anti-rotation fit between the pressing head and the side wall of the main body.

10. The pinch valve according to claim 1, characterized in that: The piston rod is threaded through the cover plate and has a second end located outside the main body, and a rotating handle is connected to the second end.

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