Pinch valve

Abstract

The utility model relates to a pinch valve, which comprises a valve body, a valve rod and a valve core, a driving unit used for driving the valve rod to move linearly is arranged in the valve body. The valve head is mounted on the valve body; the valve head is provided with a mounting groove for placing the flexible pipe; a guide groove is formed in the side wall of the valve head, and the forming direction of the guide groove is the same as the moving direction of the valve rod. The pressing piece is connected with the valve rod; the rolling unit is arranged on the pressing piece; and the rolling unit is arranged to do reciprocating rolling motion in the guide groove along the guide groove. The guide columns are in rolling motion in the guide grooves, and abrasion caused by sliding motion of the guide columns in the guide grooves can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pinch valves, in particular to a pinch valve with a guide column that rolls in a guide groove. Background Art

[0002] A pinch valve is a flow control valve that typically compresses a flexible tube using a clamping action, thereby hindering the flow of fluid through the flexible tube.

[0003] Pinch valves typically have a default position, such as a normally open or normally closed position, which they are in before actuation. Pinch valves can be controlled by pneumatic, hydraulic, or electric means to actuate from the default position to the operating position.

[0004] In the prior art, Japanese Patent No. (JP2017243069) discloses a pinch valve and tube holder that control fluid by deforming a flexible tube. The pinch valve guides a guide pin protruding from the outer circumference of a pressing component into a guide groove. The guide pin slides within the guide groove, and the pressing component performs linear reciprocating motion.

[0005] As can be seen, during operation of the existing pinch valve, the guide pin (i.e., guide member) slides within the guide groove (i.e., guide slot). Specifically, this sliding motion means that in the existing technical solution, the guide member located within the guide slot cannot roll along the sidewalls of the guide slot. Instead, the guide member can only reciprocate linearly with the pressing head. As a result, sliding friction occurs with the sidewalls of the guide slot, which easily causes wear and generates debris. Utility Model Content

[0006] Aiming at the deficiencies of the prior art, the utility model discloses a pinch valve.

[0007] The technical solutions adopted in this utility model are as follows:

[0008] A pinch valve comprising:

[0009] The valve body includes a valve stem; a driving unit for driving the valve stem to move linearly is provided in the valve body;

[0010] A valve head is mounted on the valve body; the valve head is provided with a mounting groove for placing a flexible tube; a side wall of the valve head is provided with a guide groove, and the direction of the guide groove is the same as the direction of movement of the valve stem;

[0011] The pressing unit includes a pressing member connected to the valve stem;

[0012] The rolling unit is arranged on the pressing member; the rolling unit is arranged to perform reciprocating rolling motion along the guide groove in the guide groove.

[0013] In one embodiment of the present invention, the rolling unit includes a matching rolling member and a guiding member; the rolling member or the guiding member performs reciprocating rolling motion in the guiding groove along the guiding groove.

[0014] In one embodiment of the present invention, the rolling member includes an inner ring, an outer ring and a rolling body arranged between the inner ring and the outer ring; the guide member includes a pressing member side connection portion connected to the pressing member and a first rolling body side connection portion fixedly connected to the inner ring; wherein, the outer ring performs reciprocating rolling motion in the guide groove along the guide groove.

[0015] In one embodiment of the present invention, a separator is provided between the pressing piece side connection portion and the first rolling body side connection portion; the diameter of the separator is larger than the diameter of the pressing piece side connection portion and larger than the diameter of the first rolling body side connection portion.

[0016] In one embodiment of the present invention, the rolling member includes an inner ring, an outer ring and a rolling body arranged between the inner ring and the outer ring, and the outer ring is connected to the pressing member; the guide member includes a second rolling body side connection part fixedly connected to the inner ring and a rolling part arranged on one side of the second rolling body side connection part; wherein, the rolling part performs reciprocating rolling motion in the guide groove along the guide groove.

[0017] In one embodiment of the present invention, the pressing unit further includes a connecting member arranged radially along the pressing member; the connecting member is connected to the guiding member or the connecting member is connected to the rolling member.

[0018] In one embodiment of the present invention, the pressing member and the connecting member are integrally formed.

[0019] In one embodiment of the present invention, the valve body further comprises a shell forming a fixed volume; and the valve stem has at least a portion that is not wrapped by the shell.

[0020] In one embodiment of the present invention, the valve head includes a fixed cover fixedly connected to the housing; a cavity is provided inside the fixed cover, and the valve stem drives the pressing member to perform linear reciprocating motion in the cavity.

[0021] In one embodiment of the present invention, the driving unit is one of a pneumatic device, a hydraulic device and an electric device.

[0022] The above technical solution of the utility model has the following advantages compared with the prior art:

[0023] The rolling element in the pinch valve described in this utility model utilizes rolling friction within the guide groove. The coefficient of friction for rolling friction is typically much lower than that for sliding friction. This means that under the same load, rolling friction requires less energy, thereby reducing energy consumption and heat generation. Furthermore, because rolling friction involves a smaller contact area and the contact points are constantly changing, wear is more evenly distributed, reducing the material wear rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0025] Figure 1 It is a structural schematic diagram of the pinch valve in the utility model.

[0026] Figure 2 It is a structural schematic diagram of the valve head in the utility model.

[0027] Figure 3 It is a structural schematic diagram of the pinch valve (valve head not shown) in the utility model.

[0028] Figure 4 It is a structural schematic diagram of the pressing member and the rolling unit in the first embodiment of the present invention.

[0029] Figure 5 It is a structural schematic diagram of the pressing piece in the utility model.

[0030] Figure 6 It is a front view of the pressing member in the utility model.

[0031] Figure 7 It is an exploded view of the rolling unit of the first embodiment of the present invention.

[0032] Figure 8 It is a partial cross-sectional view of the pinch valve of Example 1 of the present utility model.

[0033] Figure 9 yes Figure 8 Enlarged schematic diagram of point A in the middle.

[0034] Figure 10 4 is a perspective view of the valve head (showing the rolling unit) of the first embodiment of the present invention.

[0035] Figure 11 It is a side view of the valve head (showing the rolling unit) of the first embodiment of the present invention.

[0036] Figure 12 It is a structural schematic diagram of the retaining member in the utility model.

[0037] Figure 13It is a structural diagram of the pressing member and the rolling unit of the second embodiment of the present invention.

[0038] Figure 14 It is an exploded view of the rolling unit of the second embodiment of the present invention.

[0039] Figure 15 It is a partial cross-sectional view of the pinch valve of Example 2 of the present utility model.

[0040] Figure 16 yes Figure 15 A magnified schematic diagram in B.

[0041] Figure 17 It is a perspective view of the valve head (showing the rolling unit) of the second embodiment of the present invention.

[0042] Figure 18 It is a side view of the valve head (showing the rolling unit) of the second embodiment of the present invention.

[0043] Description of the accompanying drawings:

[0044] 10. Valve body; 11. Housing; 12. Valve stem;

[0045] 20. Valve head; 21. Flange; 22. Cylinder; 23. Cavity; 24. Guide groove; 25. Mounting groove; 26. First support hole; 27. First fixing hole;

[0046] 30. Pressing member; 31. Main body; 32. Connecting portion; 33. First extension portion; 331. Second fixing hole; 34. Second extension portion; 341. Contact surface; 342. Second supporting hole; 35. Sealing groove; 36. Gap portion;

[0047] 40. Connecting member; 41. First cylindrical pin; 42. First fixing portion; 43. First locking portion;

[0048] 50. Rolling element; 51. Inner ring; 52. Outer ring;

[0049] 60, guide member; 61, pressing member side connection portion; 62, separator; 63, first rolling element side connection portion; 601, rolling portion; 602, second rolling element side connection portion;

[0050] 70. Seals;

[0051] 80. Retaining member; 81. Second cylindrical pin; 82. Second fixing portion; 83. Second locking portion. DETAILED DESCRIPTION

[0052] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0053] The aforementioned and other technical aspects, features, and functions of the present invention will be more clearly demonstrated in the following detailed description of the embodiments with reference to the accompanying drawings. Directional terms such as up, down, left, right, front, and back, used in the following embodiments, are merely references to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention. Furthermore, throughout the embodiments, identical reference numerals denote identical components. Example 1

[0054] Combine Figure 1 、 Figure 4 and Figure 8 A pinch valve includes a valve body 10, a valve head 20, a pressing unit, and a rolling unit.

[0055] Among them, Figure 3 As shown, the valve body 10 includes a housing 11 and a valve stem 12. The housing 11 forms a fixed volume. The valve stem 12 has at least a portion not enclosed by the housing 11. A drive unit is provided within the valve body 10. The drive unit can be a pneumatic device or an electric device such as an electromagnetic solenoid (not shown in the figure). The drive unit is used to drive the valve stem 12 in linear reciprocating motion.

[0056] The valve head 20 is mounted on the valve body 10. Figure 2 and Figure 3 The valve head 20 includes a fixed cover. The fixed cover is fixedly connected to the fixed housing 11 of the valve body 10. A cavity 23 is defined within the fixed cover. The valve stem 12 drives the pressing member 30 to perform linear reciprocating motion within the cavity 23. The fixed cover comprises a flange 21 and a barrel 22. An axially extending guide groove 24 is defined on the sidewall of the barrel 22. The guide groove 24 is oriented in the same direction as the movement of the valve stem 12.

[0057] The cylinder 22 is away from the end connected to the shell 11 ( Figure 2 A mounting groove 25 for placing the flexible tube is provided (the upper end is in the middle). When the flexible tube is in the mounting groove 25, the flexible tube is located between the pressing member 30 and the retaining member 80.

[0058] The cylinder 22 is further provided with a first supporting hole 26 and a first fixing hole 27. Figure 12As shown, the retaining member 80 includes a second cylindrical pin 81, a second fixing portion 82 provided at one end of the second cylindrical pin 81, and a second locking portion 83 provided at the other end of the second cylindrical pin 81. The second fixing portion 82 and the second locking portion 83 are respectively inserted into the first fixing hole 27 and the first support hole 26. Specifically, the second fixing portion 82 is cylindrical, and the second locking portion 83 is a groove provided at the other end of the second cylindrical pin 81. When the second fixing portion 82 and the second locking portion 83 are respectively inserted from the first support hole 26 and contact the second fixing portion 82 with the first fixing hole 27, the operator can tighten the second locking portion 83 using a tool such as a screwdriver, thereby achieving a fixed connection between the barrel 22 and the retaining member 80. In this embodiment, the second fixing portion 82 can be formed with an external thread, and the first fixing hole 27 can be formed with an internal thread.

[0059] like Figure 3 As shown, the pressing unit includes a pressing member 30. The pressing member 30 is connected to the valve stem 12. The rolling unit is provided on the pressing member 30. The rolling unit is configured to perform a reciprocating rolling motion along the guide groove 24 in the guide groove 24.

[0060] This embodiment provides a pinch valve. The valve stem 12 drives the pressing member 30 to move toward the retaining member 80 until the pressing member 30 contacts the retaining member 80 , and the pinch valve clamps the flexible tube.

[0061] In this embodiment, combined with Figure 5 The pressing member 30 includes a main body 31 which is roughly cylindrical in shape and a connecting portion 32 extending axially along the main body 31 and toward the valve body 10. The connecting portion 32 is used to connect to the valve stem 12. A first extension portion 33 and a second extension portion 34 are formed along the main body 31 and extending axially toward the valve head 20. The first extension portion 33 and the second extension portion 34 are respectively located on both sides of the main body 31, and a gap portion 36 is formed between the first extension portion 33 and the second extension portion 34. The first extension portion 33 is provided with a second fixing hole 331. The second extension portion 34 is provided with a second support hole 342. The top of the second extension portion 34 has a contact surface 341. It should be noted that the contact surface 341 can be a horizontal surface or an inclined surface.

[0062] Furthermore, if Figure 4 As shown, the pressing member 30 also includes a sealing member 70. A sealing groove 35 is defined along the circumference of the main body 31, and the sealing member 70 is disposed within the sealing groove 35. The sealing member 70 is typically made of a low-friction material, such as polytetrafluoroethylene (PTFE) or polyoxymethylene (POM). These materials can effectively reduce frictional resistance during the movement of the pressing member 30, preventing direct contact and friction between the pressing member 30 and the valve body 10 during movement, thereby protecting the pressing member 30 and the valve body 10 from damage.

[0063] Furthermore, the pressing unit also includes a connecting member 40 radially disposed along the pressing member 30. The connecting member 40 includes a first cylindrical pin 41, a first fixing portion 42 disposed at one end of the first cylindrical pin 41, and a first locking portion 43 disposed at the other end of the first cylindrical pin 41. The first fixing portion 42 and the first locking portion 43 are respectively inserted into the second support hole 342 and the second fixing hole 331. Specifically, the first fixing portion 42 is cylindrical with a size matching the second support hole 342 and has a blind hole or a through hole formed on its end surface. The first locking portion 43 is cylindrical with a size matching the second fixing hole 331 and has a groove formed on its end surface. After the first fixing portion 42 and the first locking portion 43 are respectively inserted into the second fixing hole 331 and the second support hole 342 and the first locking portion 43 contacts the second fixing hole 331, an operator can tighten the first locking portion 43 using a tool such as a screwdriver, thereby achieving a fixed connection between the connecting member 40 and the pressing member 30. In this embodiment, the first locking portion 43 may be formed with an external thread, and the second fixing hole 331 may be formed with an internal thread.

[0064] In this embodiment, combined with Figures 4 to 7 , the rolling unit includes a rolling member 50 and a guiding member 60 .

[0065] The rolling element 50 includes an inner ring 51, an outer ring 52, and a rolling element disposed between the inner and outer rings 51 and 52. The guide member 60 includes a pressing member-side connection portion 61 connected to the pressing member 30 and a first rolling element-side connection portion 63 fixedly connected to the inner ring 51. The outer ring 52 reciprocates along the guide groove 24. At this point, the rolling element 50 is outside the second support hole 342 of the pressing member 30.

[0066] Furthermore, the inner wall of the blind hole or the through hole is provided with multiple turns of threads, and the outer wall of the pressing piece side connecting portion 61 is provided with multiple turns of threads, so that the first fixing portion 42 and the pressing piece side connecting portion 61 are threadedly connected.

[0067] Furthermore, if Figure 7 As shown, a separator 62 is provided between the pressing member-side connection portion 61 and the first rolling element-side connection portion 63. The diameter of the separator 62 is larger than the diameter of the pressing member-side connection portion 61 and larger than the diameter of the first rolling element-side connection portion 63. The separator 62 separates the pressing member-side connection portion 61 from the first rolling element-side connection portion 63, helping to separate the rolling element 50 from the first cylindrical pin 41 by a sufficient distance, thereby preventing interference between the rolling element 50 and the first cylindrical pin 41 or the pressing member 30 during rolling motion.

[0068] Combine Figures 8 to 11 , the working principle of this embodiment is as follows:

[0069] A guide member 60 is mounted within the inner hole of the first fixing portion 42 of the connector 40. The pressing member-side connecting portion 61 of the guide member 60 is fixedly connected to the inner ring 51 of the rolling member 50. The rolling member 50 is placed within the guide groove 24, with the outer ring 52 of the rolling member 50 contacting the sidewalls of the guide groove 24. This serves to guide the linear reciprocating motion of the pressing member 30 within the cavity 23 and prevent the pressing member 30 from rotating about the axis of the valve stem 12.

[0070] When the valve stem 12 drives the pressing member 30 to perform linear reciprocating motion in the cavity 23, the pressing member 30 drives the connecting member 40, and the connecting member 40 drives the guide member 60 at its end and the rolling member 50 fixed on the guide member 60 to perform linear reciprocating motion. The rolling member 50 performs reciprocating rolling motion in the guide groove 24 along the side wall of the guide groove 24, replacing the sliding motion of the prior art.

[0071] The retaining member 80 can come into contact with the contact surface 341 of the pressing member 30. When the valve stem 12 drives the pressing member 30 and the connecting member 40 toward the retaining member 80 until the contact surface 341 of the pressing member 30 contacts the retaining member 80, the pressing member 30 can no longer move. At this point, the gap between the connecting member 40 and the retaining member 80 is minimized, indicating the flexible tube is clamped. It can be understood that when the valve stem 12 moves to the flexible tube clamping position, the pinch valve is in a clamped state.

[0072] When the valve stem 12 drives the pressing member 30 and the connecting member 40 away from the retaining member 80, the contact surface 341 of the pressing member 30 separates from the retaining member 80, and the valve stem 12 moves to its limit position. At this point, the gap between the connecting member 40 and the retaining member 80 is maximized, and this position represents the flexible tube release position. It can be understood that when the valve stem 12 moves to the flexible tube release position, the pinch valve is in the released position. Example 2

[0073] The difference from the first embodiment is that the guide member 60 performs a reciprocating rolling motion along the guide groove 24 .

[0074] This embodiment provides a pinch valve, including a valve body 10 , a valve head 20 , a pressing member 30 , a rolling unit, and a retaining member 80 .

[0075] Among them, combined Figure 13 and Figure 14 The rolling unit includes a rolling element 50 and a guide member 60. The rolling element 50 comprises an inner ring 51, an outer ring 52, and a rolling element disposed between the inner and outer rings 51 and 52. The outer ring 52 is connected to the pressing member 30. The guide member 60 includes a second rolling element-side connection portion 602 fixedly connected to the inner ring 51 and a rolling portion 601 disposed to one side of the second rolling element-side connection portion 602. The rolling portion 601 reciprocates along the guide groove 24.

[0076] The connection method of the remaining components of the pinch valve is the same as that of the pinch valve structure provided in Example 1, and will not be repeated here.

[0077] Specifically, the connecting member 40 is inserted into the pressing member 30 through the second supporting hole 342 of the pressing member 30 and fixed therein. A rolling member 50 is installed in the connecting member 40 . The guiding member 60 is rotationally connected to the rolling member 50 . The guiding member 60 is outside the second supporting hole 342 of the pressing member 30 .

[0078] A rolling member 50 is mounted within the first fixing portion 42 of the connecting member 40. The inner ring 51 of the rolling member 50 is fixedly connected to the second rolling element-side connecting portion 602 of the guide member 60. The guide member 60 is placed within the guide groove 24, with the rolling portion 601 of the guide member 60 contacting the sidewall of the guide groove 24. This guide member 60 is used to guide the reciprocating motion of the pressing member 30 within the cavity 23 and prevent the pressing member 30 from rotating.

[0079] Combine Figures 15 to 18 , the working principle of this embodiment is as follows:

[0080] When the valve stem 12 drives the pressing member 30 to perform linear reciprocating motion in the cavity 23, the pressing member 30 drives the connecting member 40, and the connecting member 40 drives the rolling member 50 and the guide member 60 fixed on the rolling member 50 to perform linear reciprocating motion. The guide member 60 performs reciprocating rolling motion in the guide groove 24 along the side wall of the guide groove 24, replacing the sliding motion of the prior art.

[0081] From the above, it can be seen that the difference between this embodiment and embodiment one is that in embodiment one, the rolling member 50 is located outside the connecting member 40 and is in direct contact with the guide groove 24, while in this embodiment, the rolling member 50 is located inside the connecting member 40 and is not in direct contact with the guide groove 24.

[0082] It should be noted that, for the pinch valve provided in the first or second embodiment, the connecting member 40 and the pressing member 30 may be designed as an integrated structure, that is, formed as a whole. Example 3

[0083] The difference from the first or second embodiment is that the pressing unit does not include a separate pressing member 30 and connecting member 40. Instead, it can be an integral structure manufactured by molding, for example. The rolling member 50 and the guide member 60 are directly mounted on the pressing member 30. Once the pinch valve is assembled, the rolling member 50 or the guide member 60 is located within the guide groove 24.

[0084] In addition, it can be understood that the state position of the clamping flexible tube with the smallest gap between the connecting member 40 and the retaining member 80 may not occur when the retaining member 80 contacts the contact surface 341 of the pressing member 30, but when the rolling unit contacts the end of the guide groove 24.

[0085] The working principle of the pinch valve provided in this embodiment is substantially the same as that of the first or second embodiment, and will not be described in detail here.

[0086] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0087] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A pinch valve, characterized in that: include: A valve body (10) includes a valve stem (12); a drive unit for driving the valve stem (12) to move linearly is provided in the valve body (10); A valve head (20) is mounted on the valve body (10); the valve head (20) is provided with a mounting groove (25) for placing a flexible tube; a guide groove (24) is provided on a side wall of the valve head (20), and the direction in which the guide groove (24) is provided is the same as the direction in which the valve stem (12) moves; The pressing unit comprises a pressing member (30); the pressing member (30) is connected to the valve stem (12); A rolling unit is provided on the pressing member (30); the rolling unit is configured to perform reciprocating rolling motion along the guide groove (24) within the guide groove (24).

2. The pinch valve according to claim 1, wherein The rolling unit comprises a rolling member (50) and a guiding member (60) that form a match; the rolling member (50) or the guiding member (60) performs a reciprocating rolling motion in the guiding groove (24) along the guiding groove (24).

3. The pinch valve according to claim 2, wherein: The rolling element (50) includes an inner ring (51), an outer ring (52), and a rolling body arranged between the inner ring (51) and the outer ring (52); the guiding element (60) includes a pressing element side connecting portion (61) connected to the pressing element (30) and a first rolling body side connecting portion (63) fixedly connected to the inner ring (51); wherein the outer ring (52) performs a reciprocating rolling motion along the guide groove (24) in the guide groove (24).

4. The pinch valve according to claim 3, wherein: A separator (62) is provided between the pressing piece side connection portion (61) and the first rolling body side connection portion (63); the diameter of the separator (62) is larger than the diameter of the pressing piece side connection portion (61) and larger than the diameter of the first rolling body side connection portion (63).

5. The pinch valve according to claim 2, wherein: The rolling element (50) includes an inner ring (51), an outer ring (52), and a rolling body arranged between the inner ring (51) and the outer ring (52), and the outer ring (52) is connected to the pressing member (30); the guiding member (60) includes a second rolling body side connecting portion (602) fixedly connected to the inner ring (51) and a rolling portion (601) arranged on one side of the second rolling body side connecting portion (602); wherein the rolling portion (601) performs a reciprocating rolling motion in the guiding groove (24) along the guiding groove (24).

6. The pinch valve according to claim 2, wherein: The pressing unit further includes a connecting member (40) arranged radially along the pressing member (30); the connecting member (40) is connected to the guiding member (60) or the connecting member (40) is connected to the rolling member (50).

7. The pinch valve according to claim 6, wherein: The pressing member (30) and the connecting member (40) are integrally formed.

8. The pinch valve according to claim 1, wherein The valve body (10) further comprises a shell (11) forming a fixed volume; the valve stem (12) has at least a portion not wrapped by the shell (11).

9. The pinch valve according to claim 8, wherein The valve head (20) comprises a fixed cover fixedly connected to the housing (11); a cavity (23) is provided inside the fixed cover, and the valve stem (12) drives the pressing member (30) to perform linear reciprocating motion in the cavity (23).

10. The pinch valve according to claim 1, wherein The driving unit is one of a pneumatic device, a hydraulic device and an electric device.

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