Novel normally open pinch valve

Abstract

The utility model relates to the technical field of pinch valves, in particular to a novel normally-open pinch valve which comprises a sleeve, a coil framework is arranged inside the sleeve, moving iron is arranged at the bottom inside the coil framework in a vertically movable mode, and a spring guide rod is placed above the moving iron. Stop iron is fixedly installed at the top end of the interior of the sleeve, and a magnetic conductive ring is arranged at the bottom of the stop iron. A valve body is placed on the surface of the stop iron, a valve hole is transversely formed in the valve body, and a silicone tube with the two ends penetrating through is placed in the valve hole. In a standing state, the silicone tube is completely free of clamping force and can easily penetrate through the valve; the silicone tube is not arranged in a side groove of the valve body from the side surface, so that the silicone tube is prevented from shifting along the side groove; a buffer structure is arranged, so that the impact force borne by the sealing element is reduced, and the service life can reach more than 5 million times; and moreover, as the electromagnetic force of the small air gap is reduced, the residual magnetic force of the product is effectively reduced, and the response speed of the product is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of pinch valves, in particular to a new type of normally open pinch valve. Background Technique

[0002] A pinch valve is also known as a tube clamp valve, a pressure tube valve, a bladder valve, a pinch-off valve, etc. It uses pneumatic, electric, manual or hydraulic driving methods to squeeze a silicone tube to achieve the functions of opening / closing and regulating. An electromagnetic pinch valve is a form of pinch valve.

[0003] At present, when the silicone tube is under the clamping force of the solenoid valve for a long time, after about one year of purchase by the user, even if it has not been used, the silicone tube will be locally aged and cracked at the clamped position due to the long-term clamping force and cannot be used; moreover, when the pinch valve clamps the tube, the silicone tube cannot be effectively positioned, and maintenance is required after a period of time to prevent the silicone tube from deviating from the normal clamping position of the solenoid valve; at the same time, due to the limitations of the rated power and electromagnetic force of the product, the stroke of the solenoid valve is designed to be reduced, so that the silicone tube is under a certain clamping force in the initial state. And in order to reduce the clamping resistance, the clamp head is made into a shape similar to a blade, which exacerbates the damage of the silicone tube. In order to effectively activate the solenoid valve, the electromagnetic force at the large air gap is increased, thereby increasing the electromagnetic force at the small air gap to a greater extent. Content of the Utility Model

[0004] The purpose of the utility model is to provide a new type of normally open pinch valve to solve the problems of local aging and cracking of the silicone tube at the clamped position, inability to be effectively positioned, and easy damage of the silicone tube as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A new type of normally open pinch valve, including a sleeve, inside which a coil bobbin is arranged, and a coil is installed on the surface of the coil bobbin; a moving iron is arranged at the bottom inside the coil bobbin and can move up and down, and a spring guide rod is placed above the moving iron; a stop iron is fixedly installed at the top inside the sleeve, and a magnetic conductive ring is arranged at the bottom of the stop iron; a valve body is placed on the surface of the stop iron, and a mounting plate is sleeved on the surface of the valve body; a valve hole is horizontally opened inside the valve body, and a silicone tube passing through both ends is placed inside the valve hole.

[0006] Preferably, the bottom of the sleeve is covered with a bottom cover, and cross small pan head bolts are installed on both sides of the surface of the bottom cover, and the cross small pan head bolts penetrate through the bottom cover and are threadedly fixed to the surface of the sleeve.

[0007] Preferably, cross recessed countersunk head bolts are fixed at both ends of the surface of the mounting plate, and the bottom ends of the cross recessed countersunk head bolts penetrate through the mounting plate and the valve body in sequence and are threadedly fixed to the stop iron.

[0008] Preferably, one side of the bottom of the coil is electrically connected to an aviation wire, and the bottom end of the aviation wire sequentially passes through the coil skeleton and the sleeve and extends to the outside of the bottom cover. This aviation wire facilitates the wiring work of the coil.

[0009] Preferably, a stainless steel pipe is sleeved on the surface of the moving iron, a positioning sleeve is fixedly sleeved on the surface of the bottom of the stainless steel pipe, and the bottom end of the positioning sleeve is pressed on the surface of the bottom cover through the sleeve.

[0010] Preferably, a spring is sleeved on the surface of the spring guide rod, the bottom end of the spring is in close contact with the surface of the spring guide rod, and the top end of the spring is in close contact with the inner wall of the stop iron.

[0011] Preferably, a vertically movable pressure head is arranged inside the stop iron, the bottom end of the pressure head is fixedly connected to the top end of the spring guide rod by threads, and the bottom end of the pressure head is in contact with the surface of the silica gel tube.

[0012] Preferably, the shape of the valve hole is a long round hole structure with a rectangle in the middle and semicircles at both ends. The diameters of the round holes at the upper and lower ends of the valve hole are 4.2 MM; the outer diameters of the two cylinders at both ends of the silica gel tube are 3 MM.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the static state, the silica gel tube is not subjected to any clamping force and can easily pass through the valve; a normally open pinch valve specially customized with a push-type electromagnet structure cancels the side groove for inserting the silica gel tube into the valve body from the side, preventing the silica gel tube from shifting along the side groove, and designing a circular front penetration hole according to the maximum deformation size of the silica gel tube, having a self-positioning function for the silica gel tube; a buffer structure is arranged at the valve port, reducing the impact force on the seal, and the service life can reach more than 5 million times; by using electromagnetic simulation software, a nearly linear electromagnetic force is designed. In the initial and energized states of the solenoid valve, the electromagnetic force and the spring force form a balanced acting force. Without the need to rely on pre-pressing the silica gel tube and a knife-shaped pressure head to achieve the function of the product, this new type of normally open pinch valve uses a flat-surface-loaded chuck, thus greatly improving the service life of the product (silica gel tube). Since the electromagnetic force in the small air gap is reduced, the residual magnetic force of the product is also effectively reduced, thereby accelerating the response speed of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional external structure schematic diagram of the present utility model;

[0015] Figure 2 is a three-dimensional cross-sectional structure schematic diagram of the present utility model;

[0016] Figure 3 is a side view external structure schematic diagram of the present utility model;

[0017] Figure 4For the present utility model Figure 3 is the schematic cross-sectional structure diagram of "A-A" in

[0018] Figure 5 is the schematic explosion structure diagram of the present utility model.

[0019] In the figure: 1, valve body; 101, valve hole; 2, sleeve; 3, bottom cover; 31, cross small pan head bolt; 4, stop iron; 41, magnetic conductive ring; 5, coil skeleton; 6, coil; 61, aviation wire; 7, moving iron; 71, stainless steel pipe; 72, positioning sleeve; 8, pressing head; 9, spring guide rod; 10, silica gel tube; 11, mounting plate; 111, cross recessed countersunk head bolt; 12, spring; 13, single head knurled stop pin. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described 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. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. At the same time, in the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0021] The structure of the novel normally open pinch valve provided by the present utility model is as Figure 1 and Figure 2 shown, including a sleeve 2, the bottom of the sleeve 2 is covered with a bottom cover 3, and on both sides of the surface of the bottom cover 3 are installed cross small pan head bolts 31, and the cross small pan head bolts 31 penetrate through the bottom cover 3 and are threadedly fixedly connected to the surface of the sleeve 2; a coil skeleton 5 is arranged inside the sleeve 2, and a coil 6 is installed on the surface of the coil skeleton 5. One side of the bottom of the coil 6 is electrically connected to an aviation wire 61, and the bottom end of the aviation wire 61 sequentially passes through the coil skeleton 5 and the sleeve 2 and extends to the outside of the bottom cover 3. This aviation wire 61 facilitates the wiring work of the coil 6.

[0022] During implementation, when the coil 6 on the coil skeleton 5 is energized under the connection of the aviation wire 61.

[0023] Further, as Figure 2 and Figure 4As shown in the figure, an armature 7 is movably arranged at the bottom inside the coil bobbin 5. A spring guide rod 9 is placed above the armature 7. A spring 12 is sleeved on the surface of the spring guide rod 9. The bottom end of the spring 12 is in close contact with the surface of the spring guide rod 9, and the top end of the spring 12 is in close contact with the inner wall of the stop iron 4. A stainless steel tube 71 is sleeved on the surface of the armature 7. A positioning sleeve 72 is fixedly sleeved on the surface of the bottom of the stainless steel tube 71. The bottom end of the positioning sleeve 72 is pressed on the surface of the bottom cover 3 through a sleeve 2. A movable pressure head 8 is arranged inside the stop iron 4. The bottom end of the pressure head 8 is fixedly connected to the top end of the spring guide rod 9 by means of threads, and the bottom end of the pressure head 8 is in contact with the surface of the silica gel tube 10.

[0024] During implementation, the stop iron 4 will attract and hold the armature 7. When being attracted and held, the armature 7 will move upward, thereby pushing the spring guide rod 9 to rise, and then pushing up the pressure head 8 to cooperate with the stop pin to clamp the silica gel tube 10.

[0025] Furthermore, as Figure 3 and Figure 4 shown in the figure, a stop iron 4 is fixedly installed at the top end inside the sleeve 2. A magnetic conductive ring 41 is arranged at the bottom of the stop iron 4. A valve body 1 is placed on the surface of the stop iron 4. An installation plate 11 is sleeved on the surface of the valve body 1. Countersunk head screws 111 with cross slots are fixed at both ends of the surface of the installation plate 11. The bottom ends of the countersunk head screws 111 with cross slots sequentially penetrate through the installation plate 11 and the valve body 1 and are fixedly connected to the stop iron 4 by means of threads. A valve hole 101 is horizontally opened inside the valve body 1. A silica gel tube 10 with both ends penetrating is placed inside the valve hole 101. A single-headed knurled stop pin 13 with both ends penetrating is horizontally arranged above the silica gel tube 10 and inside the valve body 1. The single-headed knurled stop pin 13 is in close contact and cooperation with the silica gel tube 10. The shape of the valve hole 101 is a long round hole structure with a rectangular middle part and semi-circular ends at both ends. The diameter of the round holes at the upper and lower ends of the valve hole 101 is 4.2 MM. The outer diameter of the cylinders at both ends of the silica gel tube 10 is 3 MM.

[0026] During implementation, the present utility model designs a corresponding valve hole 101 for a certain specification of the silica gel tube 10. Specifically, for the silica gel tube 10 with an outer diameter of 3 MM, a valve hole 101 with a diameter of 4.2 MM is designed. The long round hole structure of the valve hole 101 can enable the silica gel tube 10 to be automatically positioned on the center line of the solenoid valve. Moreover, a slightly larger hole is opened for the valve hole 101 relative to the silica gel tube 10, so that when the silica gel tube 10 is clamped (the vertical dimension will increase), there will be no interference in the vertical direction of the silica gel tube 10. At the same time, as long as the silica gel tube 10 is not damaged, it will never come out of the solenoid valve.

[0027] Furthermore, as Figure 2As shown in the figure, a magnetic conduction ring 41 is designed on the stop iron of the utility model. After the coil is energized, part of the magnetic lines of force pass through the magnetic conduction ring 41 and then enter the moving iron. At the same time, according to the simulation software, it can be obtained that there is an obvious skin effect of the magnetic lines of force. The closer to the outer surface of the part, the redder the color of the magnetic lines of force and the denser the lines. The magnetic conduction ring is equivalent to putting a boot on the valve core and collecting part of the magnetic lines of force.

[0028] The corresponding values between the magnetic force of the magnetic conduction ring and the maximum opening of the pinch valve are as follows:

[0029] As can be seen from the above table, when the pinch valve is at the maximum opening (3 mm), after adding the magnetic conduction ring, a magnetic circuit is formed between the valve cores by the magnetic lines of force, while the magnetic lines of force without the magnetic conduction ring are disconnected between the valve cores. Therefore, the force value of the pinch valve with the magnetic conduction ring at the maximum opening is much larger than that of the pinch valve without the magnetic conduction ring.

[0030] Working principle: When the coil 6 on the coil skeleton 5 is energized under the connection of the aviation wire 61, the stop iron 4 will attract the moving iron 7. When attracting, the moving iron 7 will move upward, thus pushing the spring guide rod 9 to rise, and then pushing the pressing head 8 and the stop pin to cooperate with each other to clamp the silica gel tube 10.

[0031] When the coil 6 on the coil skeleton 5 is powered off, the spring 12 will push the spring guide rod 9 to press down. The downward movement of the spring guide rod 9 will push the moving iron 7 to move downward to the original position. At the same time, the downward movement of the spring guide rod 9 will cause the pressing head 8 to move downward under its own gravity, thus loosening the silica gel tube 10.

[0032] The utility model designs a corresponding valve hole 101 for a certain specification of silica gel tube 10. Specifically, for a silica gel tube 10 with an outer diameter of 3 MM, a valve hole 101 with a size of 4.2 MM is designed. The long round hole structure of the valve hole 101 can make the silica gel tube 10 automatically positioned on the center line of the solenoid valve; moreover, a slightly larger hole is opened for the valve hole 101 relative to the silica gel tube 10, so that when the silica gel tube 10 is clamped (the vertical dimension will increase), there will be no interference in the vertical direction of the silica gel tube 10; at the same time, as long as the silica gel tube 10 does not break, it will never come out of the solenoid valve.

[0033] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A novel normally open pinch valve, comprising a sleeve (2), characterized in that: A coil frame (5) is arranged inside the sleeve (2), and a coil (6) is mounted on the surface of the coil frame (5); a moving iron (7) is arranged at the bottom of the coil frame (5) so as to be movable up and down, and a spring guide rod (9) is placed above the moving iron (7); a stop iron (4) is fixedly mounted at the top of the sleeve (2), and a magnetic conductive ring (41) is arranged at the bottom of the stop iron (4); a valve body (1) is placed on the surface of the stop iron (4), and a mounting plate (11) is sleeved on the surface of the valve body (1); a valve hole (101) is horizontally opened inside the valve body (1), and a silicone tube (10) with two ends passing through is placed inside the valve hole (101).

2. The novel normally open pinch valve according to claim 1, characterized in that: The bottom of the sleeve (2) is covered with a bottom cover (3), and small cross pan head bolts (31) are installed on both sides of the surface of the bottom cover (3), and the small cross pan head bolts (31) penetrate the bottom cover (3) and are fixedly connected to the surface of the sleeve (2) by threads.

3. The novel normally open pinch valve according to claim 1 is characterized in that: Cross recessed countersunk bolts (111) are fixed to both ends of the surface of the mounting plate (11), and the bottom ends of the cross recessed countersunk bolts (111) penetrate the mounting plate (11) and the valve body (1) in sequence and are threadedly fixedly connected to the stop iron (4).

4. The novel normally open pinch valve according to claim 1 is characterized in that: One side of the bottom of the coil (6) is electrically connected to an aviation wire (61), and the bottom end of the aviation wire (61) passes through the coil frame (5) and the sleeve (2) in sequence and extends to the outside of the bottom cover (3), and the aviation wire (61) facilitates the wiring work of the coil (6).

5. The novel normally open pinch valve according to claim 1 is characterized in that: The surface of the moving iron (7) is sleeved with a stainless steel tube (71), and the bottom surface of the stainless steel tube (71) is sleeved with a positioning sleeve (72) fixed thereto, and the bottom end of the positioning sleeve (72) is pressed onto the surface of the bottom cover (3) through a sleeve (2).

6. The novel normally open pinch valve according to claim 1 is characterized in that: A spring (12) is sleeved on the surface of the spring guide rod (9), and the bottom end of the spring (12) is in close contact with the surface of the spring guide rod (9), and the top end of the spring (12) is in close contact with the inner wall of the stop iron (4).

7. The novel normally open pinch valve according to claim 1 is characterized in that: A pressure head (8) that can move up and down is arranged inside the stop iron (4), and the bottom end of the pressure head (8) and the top end of the spring guide rod (9) are threadedly fixedly connected to each other, and the bottom end of the pressure head (8) and the surface of the silicone tube (10) are in contact with each other.

8. The novel normally open pinch valve according to claim 1 is characterized in that: The shape of the valve hole (101) is a long circular hole structure with a rectangular middle and semicircular ends. The diameter of the circular holes at the upper and lower ends of the valve hole (101) is 4.2 mm. The outer diameter of the cylinders at the two ends of the silicone tube (10) is 3 mm.

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