Normally closed pinch valve for preventing blockage of pipe body

Abstract

The utility model discloses a normally-closed pinch valve capable of preventing a pipe body from being blocked. The normally-closed pinch valve comprises a valve seat, a flexible pipe body, a pushing piece, a pushing driving part and an anti-blocking part, wherein the flexible pipe body, the pushing piece, the pushing driving part and the anti-blocking part are arranged in the valve seat; wherein a fluid channel capable of being opened and closed is arranged in the flexible pipe body; the pushing and pressing piece can move in the direction close to or away from the flexible pipe body under the action of the pushing and pressing driving part so as to open and close the fluid channel; the anti-blocking part comprises elastic pressing pieces which are symmetrically arranged on the two sides of the flexible pipe body in the direction perpendicular to the moving direction of the pushing and pressing piece, and the elastic pressing pieces can abut against the pushing and pressing piece or the flexible pipe body; when the pushing and pressing piece moves in the direction close to the flexible pipe body, the pushing and pressing piece can be pushed and pressed on the flexible pipe body so that the fluid channel can be closed, and at the moment, the elastic pressing piece abuts against the pushing and pressing piece and is in an elastic compression state. According to the normally-closed pinch valve, the phenomenon that the pipe body is blocked can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a normally closed pinch valve for preventing a tube body from being blocked. Background Art

[0002] The pinch valve, also known as the tube clamp valve, tube compression valve, airbag valve, pinch valve, etc., uses pneumatic, electric, manual or hydraulic drive to squeeze the tube body to achieve the function of switching or regulation. Among them, the tube body is an important part of the pinch valve, usually made of elastic materials such as rubber. There is a flow path inside the tube body. When the tube body is deformed under the action of external force, the flow path will be open or closed or the flow rate will change.

[0003] In a normally closed (NC) pinch valve, the tube body may become sticky and blocked because the tube body remains closed for a long time when the equipment is shut down. When the equipment is started again, the flow path in the tube body may not be opened in time due to the sticking and blockage of the tube body, thereby affecting the normal operation of the equipment. Utility Model Content

[0004] In order to overcome the above disadvantages, the purpose of the utility model is to provide a normally closed pinch valve for preventing tube occlusion, which can effectively avoid the occurrence of tube occlusion.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is: a normally closed pinch valve for preventing tube body occlusion, comprising a valve seat and a flexible tube body, a push piece, a push drive part and an anti-occlusion part arranged in the valve seat; wherein,

[0006] The flexible pipe body is provided with a fluid passage which can be opened and closed;

[0007] The pushing member can move towards or away from the flexible tube body under the action of the pushing driving part to open or close the fluid channel;

[0008] The anti-blocking part includes elastic pressing pieces symmetrically arranged on both sides of the flexible tube body in a direction perpendicular to the moving direction of the pushing piece, and the elastic pressing pieces can abut against the pushing piece or the flexible tube body;

[0009] When the pushing piece moves toward the direction close to the flexible tube body, the pushing piece can push on the flexible tube body to close the fluid passage. At this time, the elastic pressing piece abuts against the pushing piece and is in an elastically compressed state.

[0010] When the pushing piece moves in a direction away from the flexible tube body, the elastic pressing piece can push the flexible tube body in a direction perpendicular to the moving direction of the pushing piece under the action of its own elastic force, so that the fluid channel is opened.

[0011] The beneficial effects of the normally closed pinch valve of the utility model are:

[0012] In the initial state (equipment shutdown state), the pushing drive unit drives the pushing piece to push the flexible tube body so that the flexible tube body is deformed to close the fluid channel. At this time, the elastic pressure pieces located on both sides of the flexible tube body can press against the pushing piece; when the equipment is running, the pushing drive unit drives the pushing piece to leave the flexible tube body. If the flexible tube body is in a normal state (no sticking phenomenon occurs on the inner wall of the fluid channel), at this time, the flexible tube body can be reset by relying on its own deformation ability. At the same time, the elastic pressure piece can be pressed against the flexible tube body under the action of its own elastic force to apply force to reset the flexible tube body to ensure that the fluid channel is opened; if the flexible tube body is in an abnormal state (sticking phenomenon occurs on the inner wall of the fluid channel), at this time, due to the stickiness of the inner wall of the fluid channel, it is difficult for the flexible tube body to be reset by relying on its own deformation ability, and the elastic pressure piece can still be pressed against the flexible tube body under the action of its own elastic force to apply force to reset the flexible tube body, and the fluid channel is opened. That is, even when the flexible tube body is blocked by sticking, the pinch valve of the present application can still ensure the normal opening of the fluid channel and the normal operation of the equipment.

[0013] Furthermore, the pushing member includes a push rod, and one end of the push rod is provided with a pushing cavity for accommodating the flexible tube body, and the other end is connected to the pushing driving part; the depth of the pushing cavity along the moving direction of the pushing member is smaller than the diameter of the flexible tube body. The deformation range of the flexible tube body is limited by the setting of the pushing cavity, and the depth of the pushing cavity along the moving direction of the pushing member is limited to be smaller than the diameter of the flexible tube body, so that the flexible tube body can be squeezed and deformed along the moving direction of the pushing member. It should be noted that the diameter of the flexible tube body refers to the radial dimension of the flexible tube body when it is not subjected to external force.

[0014] Furthermore, the outer wall of one end of the push rod facing the flexible tube body is in a truncated cone structure, and the truncated cone structure is abutted by the elastic pressure piece. When the push rod moves toward the flexible tube body, the truncated cone structure can gradually apply pressure to the elastic pressure piece from the side of the small circular surface to the side of the large circular surface, so that the elastic pressure piece moves away from the flexible tube body; at the same time, when the push rod moves away from the tube body, the truncated cone structure can also abut on the elastic pressure piece to prevent the elastic pressure piece from resetting too quickly, thereby playing a buffering role.

[0015] Furthermore, the elastic pressure piece includes a stop block, a spring, and an abutment head. The stop block is fixed in the valve seat. The spring is arranged perpendicular to the moving direction of the push piece, and its two ends abut against the abutment head and the stop block respectively. The setting of the stop block can stop the elastic pressure piece as a whole to prevent the elastic pressure piece from detaching from the valve seat.

[0016] Furthermore, one end of the abutment head facing the flexible pipe body is in a spherical structure, so as to facilitate smooth abutment between the abutment head and the push rod or the flexible pipe body.

[0017] Furthermore, the abutment head includes a ball and a rod, one end of the rod is inserted into the stop block, and the other end is connected to the ball; the spring is sleeved on the rod, and its two ends abut against the ball and the stop block respectively. The setting of the rod can guide the moving direction of the spring, making the moving direction of the ball more stable.

[0018] Furthermore, a first valve cavity and a second valve cavity which are arranged vertically and communicate with each other are provided in the valve seat, the flexible tube body is located at the junction of the first valve cavity and the second valve cavity, the pushing member is located in the first valve cavity, and the anti-blocking portion is located in the second valve cavity.

[0019] Furthermore, the pushing drive part includes a fixed iron core, a movable iron core and an electromagnetic coil surrounding the outside of the fixed iron core. The movable iron core is located between the fixed iron core and the pushing piece, one end of which is connected to the pushing piece, and the other end is connected to the fixed iron core through a driving spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the normally closed pinch valve of the utility model when the fluid passage is closed;

[0021] Figure 2 This is a schematic diagram of the structure of the normally closed pinch valve of the utility model when the fluid passage is opened;

[0022] Figure 3 for Figure 2 A partial enlarged view of area A in the middle.

[0023] In the figure:

[0024] 1-valve seat; 11-first valve chamber; 12-second valve chamber;

[0025] 2-flexible tube body; 21-fluid channel;

[0026] 3-push member; 31-push cavity; 32-truncated cone structure;

[0027] 4-push driving member; 41-fixed iron core; 42-movable iron core; 43-electromagnetic coil; 44-driving spring;

[0028] 5-elastic pressure piece; 51-stop block; 52-spring; 53-butt joint. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0030] Example

[0031] See attached Figure 1-3 As shown, the utility model is a normally closed type pinch valve for preventing tube body occlusion, comprising a valve seat 1 and a flexible tube body 2 arranged in the valve seat 1, a push piece 3, a push drive part 4 and an anti-occlusion part; wherein a fluid passage 21 capable of opening and closing is provided in the flexible tube body 2; the push piece 3 can move toward or away from the flexible tube body 2 under the action of the push drive part 4 to open and close the fluid passage 21; the anti-occlusion part comprises elastic pressing pieces symmetrically arranged on both sides of the flexible tube body 2 in a direction perpendicular to the moving direction of the push piece 3 5, the elastic pressing piece 5 can abut against the pushing piece 3 or the flexible tube body 2; when the pushing piece 3 moves in a direction close to the flexible tube body 2, the pushing piece 3 can push on the flexible tube body 2 to close the fluid channel 21. At this time, the elastic pressing piece 5 abuts against the pushing piece 3 and is in an elastically compressed state; when the pushing piece 3 moves in a direction away from the flexible tube body 2, the elastic pressing piece 5 can push the flexible tube body 2 in a direction perpendicular to the moving direction of the pushing piece 3 under the action of its own elastic force to open the fluid channel 21.

[0032] In the initial state (equipment shutdown state), the pushing member 3 is driven by the pushing driving part 4 to push the flexible tube body 2, so that the flexible tube body 2 is deformed to close the fluid channel 21. At this time, the elastic pressure members 5 located on both sides of the flexible tube body 2 can press against the pushing member 3; when the equipment is running, the pushing driving part 4 drives the pushing member 3 to leave the flexible tube body 2. If the flexible tube body 2 is in a normal state (no sticking phenomenon occurs on the inner wall of the fluid channel 21), at this time, the flexible tube body 2 can be reset by relying on its own deformation ability. At the same time, the elastic pressure member 5 can be pressed against the flexible tube body 2 under the action of its own elastic force to apply force to reset the flexible tube body 2 to ensure that the fluid channel 21 is opened; if the flexible tube body 2 is in an abnormal state (the inner wall of the fluid channel 21 is sticky), at this time, due to the sticking of the inner wall of the fluid channel 21, the flexible tube body 2 is difficult to reset by relying on its own deformation ability, and the elastic pressure member 5 can still be pressed against the flexible tube body 2 under the action of its own elastic force to apply force to reset the flexible tube body 2, and the fluid channel 21 is opened. Even when the flexible pipe body 2 is blocked by sticking, the fluid channel 21 can still be opened normally, thereby ensuring the normal operation of the equipment.

[0033] In some embodiments, see Appendix Figure 1As shown, a first valve cavity 11 and a second valve cavity 12 which are arranged vertically and communicate with each other are provided in the valve seat 1, the flexible tube body 2 is located at the junction of the first valve cavity 11 and the second valve cavity 12, the push piece 3 is located in the first valve cavity 11, and the anti-blocking portion is located in the second valve cavity 12. Through the vertical arrangement of the first valve cavity 11 and the second valve cavity 12, the push piece 3 and the anti-blocking portion can respectively apply force to the flexible tube body 2 in the vertical direction, so as to facilitate the resetting of the flexible tube body 2.

[0034] It should be noted that the flexible tube body 2 is of prior art and can be made of rubber, and the fluid channel 21 is arranged in the middle of the flexible tube body 2. When the flexible tube body 2 is squeezed and deformed, the fluid channel 21 can be closed under the squeezing of the flexible tube body 2.

[0035] In some embodiments, see Appendix Figure 2-3 As shown, the pushing member 3 includes a push rod, one end of the push rod facing the flexible tube body 2 is provided with a pushing cavity 31 for accommodating the flexible tube body 2, and the other end is connected to the pushing driving part 4. The depth of the pushing cavity 31 along the moving direction of the pushing member 3 is less than the diameter of the flexible tube body 2, and the depth of the pushing cavity 31 along the moving direction perpendicular to the pushing member 3 is greater than the diameter of the flexible tube body 2. The diameter of the flexible tube body 2 refers to the radial dimension of the flexible tube body 2 when no external force is applied. The deformation range of the flexible tube body 2 is limited by the setting of the pushing cavity 31.

[0036] When the pushing drive part 4 pushes the push rod to move toward the flexible tube body 2, the pushing chamber 31 can move toward the flexible tube body 2, so that the flexible tube body 2 enters the pushing chamber 31; as the pushing chamber 31 continues to move, the bottom wall of the pushing chamber 31 can be pressed against the flexible tube body 2, so that the flexible tube body 2 is squeezed under the joint action of the pushing chamber 31 and the second valve chamber 12.

[0037] In some embodiments, the outer wall of one end of the push rod facing the flexible tube body 2 is a truncated cone structure 32, and the truncated cone structure 32 is abutted by the elastic pressure piece 5. When the push rod moves toward the flexible tube body 2, the truncated cone structure 32 can gradually press the elastic pressure piece 5 from the side of the small circular surface to the side of the large circular surface, so that the elastic pressure piece 5 moves away from the flexible tube body 2; at the same time, when the push rod moves away from the flexible tube body 2, the truncated cone structure 32 can also abut on the elastic pressure piece 5 to prevent the elastic pressure piece 5 from resetting too quickly, playing a buffering role. As the push rod continues to move away, the elastic pressure piece 5 immediately presses against the flexible tube body 2.

[0038] For details, see the attached Figure 3As shown, the elastic pressure piece 5 includes a stop block 51, a spring 52, and an abutment head 53. The stop block 51 is fixed in the second valve cavity 12. The spring 52 is arranged perpendicular to the moving direction of the push piece 3, and its two ends are respectively abutted against the abutment head 53 and the stop block 51. Furthermore, one end of the abutment head 53 facing the flexible tube body 2 is spherical, so as to facilitate smooth abutment between the abutment head 53 and the push rod or the flexible tube body 2.

[0039] Furthermore, the abutment head 53 includes a ball and a rod, one end of the rod is inserted into the stop block 51, and the other end is connected to the ball; the spring 52 is sleeved on the rod, and its two ends are respectively abutted against the ball and the stop block 51. The setting of the rod can guide the moving direction of the spring 52, so that the moving direction of the ball is more stable.

[0040] In some embodiments, the pushing drive part 4 includes a fixed iron core 41, a movable iron core 42 and an electromagnetic coil 43 surrounding the outside of the fixed iron core 41. The movable iron core 42 is located between the fixed iron core 41 and the push rod, one end of which is connected to the push rod, and the other end is connected to the fixed iron core 41 through a driving spring 44.

[0041] In the initial state, the electromagnetic coil 43 is in a de-energized state, the push rod is pressed against the flexible tube body 2, the fluid channel 21 is closed, and the elastic pressure piece 5 is pressed against the truncated cone structure 32 of the push rod; when the electromagnetic coil 43 is energized, the movable iron core 42 moves toward the fixed iron core 41, the driving spring 44 is compressed, the push rod immediately leaves the flexible tube body 2, and the elastic pressure piece 5 immediately moves toward the flexible tube body 2 under the action of its own elastic force, so that the fluid channel 21 in the flexible tube body 2 is opened.

[0042] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A normally closed pinch valve for preventing tube occlusion, characterized in that: It includes a valve seat and a flexible tube body, a pushing member, a pushing driving part and an anti-blocking part arranged in the valve seat; wherein, The flexible pipe body is provided with a fluid passage which can be opened and closed; The pushing member can move towards or away from the flexible tube body under the action of the pushing driving part to open or close the fluid channel; The anti-blocking part includes elastic pressing pieces symmetrically arranged on both sides of the flexible tube body in a direction perpendicular to the moving direction of the pushing piece, and the elastic pressing pieces can abut against the pushing piece or the flexible tube body; When the pushing piece moves toward the direction close to the flexible tube body, the pushing piece can push on the flexible tube body to close the fluid passage. At this time, the elastic pressing piece abuts against the pushing piece and is in an elastically compressed state. When the pushing piece moves in a direction away from the flexible tube body, the elastic pressing piece can push the flexible tube body in a direction perpendicular to the moving direction of the pushing piece under the action of its own elastic force, so that the fluid channel is opened.

2. The normally closed pinch valve according to claim 1, characterized in that: The pushing member includes a push rod, one end of which is toward the flexible tube body and is provided with a pushing cavity for accommodating the flexible tube body, and the other end of the push rod is connected to the pushing driving part; the depth of the pushing cavity along the moving direction of the pushing member is smaller than the diameter of the flexible tube body.

3. The normally closed pinch valve according to claim 2, characterized in that: The outer wall of one end of the push rod facing the flexible tube body is in a truncated cone structure, and the elastic pressing piece abuts against the truncated cone structure.

4. The normally closed pinch valve according to claim 1, characterized in that: The elastic pressure piece includes a stop block, a spring, and an abutment head. The stop block is fixed in the valve seat. The spring is arranged perpendicular to the moving direction of the push piece, and its two ends abut against the abutment head and the stop block respectively.

5. The normally closed pinch valve according to claim 4, characterized in that: One end of the abutment head facing the flexible pipe body is in a spherical structure.

6. The normally closed pinch valve according to claim 4, characterized in that: The abutment head comprises a ball and a rod body, one end of the rod body is passed through the stop block, and the other end is connected to the ball; the spring is sleeved on the rod body, and its two ends abut against the ball and the stop block respectively.

7. The normally closed pinch valve according to claim 1, characterized in that: A first valve cavity and a second valve cavity which are arranged vertically and communicate with each other are arranged in the valve seat, the flexible tube body is located at the junction of the first valve cavity and the second valve cavity, the pushing member is located in the first valve cavity, and the anti-blocking part is located in the second valve cavity.

8. The normally closed pinch valve according to claim 1, characterized in that: The pushing drive part includes a fixed iron core, a movable iron core and an electromagnetic coil surrounding the outside of the fixed iron core. The movable iron core is located between the fixed iron core and the pushing piece, one end of which is connected to the pushing piece, and the other end is connected to the fixed iron core through a driving spring.

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