A resistance valve

Abstract

The present invention relates to a resistance valve, comprising: an inner cylinder, which can be deformed outward in a radial direction, a semi-elliptical outer spiral groove is provided on the outer wall of the inner cylinder, and an inclined deformation groove is provided inside the inner cylinder; a slider slides in the inner cylinder along the extension direction of the deformation groove, the inclined surface of the slider abuts on the deformation groove, and the inner cylinder is pushed to deform outward in a radial direction by the slider; a rotating shaft is threadedly connected to the slider, and the rotating shaft drives the slider to slide along the axial extension direction of the rotating shaft; an outer cylinder is sleeved outside the inner cylinder, and a semi-elliptical inner spiral groove is provided on the inner wall of the outer cylinder, and the inner spiral groove cooperates with the outer spiral groove to form a multi-layer spiral plastic pipe accommodating space. The present invention adopts a spiral winding method to increase the clamping length of the plastic pipe, and provides appropriate resistance to the plastic pipe through the radial deformation of the cylinder, thereby providing the back pressure required for the operation of the pump connected to the pipe, reducing the impact on the flowing medium in the plastic pipe.

Description

Technical Field

[0001] The invention relates to the fields of pharmaceutical and biotechnical technology, in particular to a resistance valve. Background Art

[0002] The resistance valve (back pressure valve) can maintain the required pressure in the pipeline so that the pump can output the flow normally. Back pressure will occur when pumps are working. Back pressure is the pressure of the pump's output fluid acting in the output direction in reverse. Usually, the resistance valve (back pressure valve) is used in the liquid delivery link.

[0003] As artificial hearts, that is, centrifugal blood pumps, are gradually used in clinical practice, higher requirements are placed on the safety of blood pumps. In vitro hemolysis testing is a key step in evaluating the hemolysis performance of blood pumps. In the in vitro test platform of the blood pump, a resistance valve is often used to extrude the medical hose to form a local stenosis structure to provide pressure loss to offset the pressure head of the blood pump and form a loop that meets the test conditions. However, the local flow field at the stenosis is complex and there is a reflux area, which causes a sharp increase in blood flow stress and greatly increases blood damage. In addition to the blood damage caused by the tested blood pump, the blood damage caused by the components in the circuit, especially the resistance valve for adjusting the back pressure, may affect the accuracy, repeatability and comparability of the hemolysis test results.

[0004] Extending it to the flow medium pipeline involving the participation of the resistance valve (back pressure valve), the influence of the resistance valve (back pressure valve) on the various indicators of the flow medium cannot be ignored. The resistance valve can be used in the circuit for conveying sensitive fluids such as blood, protein macromolecule drugs, ultra-clean raw materials, fuels, etc. Especially in the biopharmaceutical industry, it is required to minimize the damage to the flow medium during the liquid conveying process, such as conveying biopharmaceutical liquids, blood, cell suspensions, etc. Various components in the conveying circuit have a certain influence on the medium, so it is necessary to optimize some components in the conveying pipeline.

[0005] The prior art publication number is: WO2007107692A1, and the invention name is: The patent of valve discloses a resistance valve for squeezing plastic pipes. The product realizes the lifting and lowering of the compression component by turning the knob through the thread, and variably flattens the plastic pipe placed on the concave surface of the base. After flattening, a local narrow structure appears in the pipe, and the flow of liquid is suddenly hindered in the narrow place, thereby achieving the effect of providing back pressure in the pipe, so that sufficient pressure is maintained in the entire circuit, allowing the water pump to work normally and ensuring the normal flow of liquid in the pipe.

[0006] The resistance valve prepared by the above patent has the following disadvantages:

[0007] 1. The above-mentioned traditional resistance valve forms a narrow structure with a small cross-sectional area, which causes great damage to the blood and greatly interferes with the test results, resulting in the test results being unable to reflect the degree of damage to the blood caused by the blood pump itself, thereby failing to achieve the purpose of detecting the performance of the blood pump itself, reducing the detection efficiency, wasting experimental time, and consuming experimental materials; expanding to more fields, in addition to blood, protein macromolecular drugs, ultra-clean raw materials, fuels and other sensitive fluids will be affected by traditional resistance valves.

[0008] 2. The above-mentioned resistance valve has a small adjustable pressure range, low adjustment accuracy and slow response speed.

[0009] 3. The above-mentioned resistance valve cannot store more liquid at the same time to replace the liquid reservoir. Summary of the invention

[0010] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the traditional resistance valve forms a narrow structure with too small a cross-sectional area, which causes great blood damage, and to provide a resistance valve that increases the clamping length of the plastic pipe by spiral winding and provides appropriate resistance to the plastic pipe through radial deformation of the cylinder, thereby providing the back pressure required by the plastic pipe and reducing the impact on the flowing medium in the plastic pipe.

[0011] In order to solve the above technical problems, the present invention provides a resistance valve for providing resistance for liquid in a plastic pipe, comprising:

[0012] An inner cylinder body, the inner cylinder body is a cylindrical structure, the inner cylinder body can be deformed outward in the radial direction, a semicircular outer spiral groove is provided on the outer wall of the inner cylinder body, and an inclined deformation sliding groove is provided inside the inner cylinder body;

[0013] A slider is arranged in the inner cylinder, the slider has an inclined surface matching the deformation slide groove, the slider slides in the inner cylinder along the extension direction of the deformation slide groove, the inclined surface of the slider abuts against the deformation slide groove, and the inner cylinder is pushed to deform outward in the radial direction by the slider;

[0014] A rotating shaft is arranged in the inner cylinder, the rotating shaft passes through the slider and is threadedly connected with the slider, and the rotating shaft drives the slider to slide along the axial extension direction of the rotating shaft;

[0015] The outer cylinder is sleeved on the inner cylinder. A semicircular inner spiral groove is provided on the inner wall of the outer cylinder. The inner spiral groove cooperates with the outer spiral groove to form a multi-layer spiral plastic pipe accommodating space.

[0016] In one embodiment of the present invention, a plurality of deformation grooves are provided on the side wall of the inner cylinder, the deformation grooves are arranged along the axial extension direction of the inner cylinder, and the plurality of deformation grooves are evenly distributed around the circumference of the inner cylinder.

[0017] In one embodiment of the present invention, a plurality of deformation grooves are provided on the side wall of the inner cylinder, the deformation grooves are arranged along the axial extension direction of the inner cylinder, and the plurality of deformation grooves are evenly distributed around the circumference of the inner cylinder.

[0018] In one embodiment of the present invention, the outer cylinder body is formed by splicing a plurality of arc pieces end to end to form a cylindrical structure, and a snap-fit ​​structure is provided between two connected arc pieces.

[0019] In one embodiment of the present invention, the rotating shaft partially protrudes from the inner cylinder, and a handle is provided at one end of the rotating shaft protruding from the inner cylinder.

[0020] In one embodiment of the present invention, it also includes:

[0021] A bottom plate, the inner cylinder and the outer cylinder are both arranged on the bottom plate, the inner cylinder and the bottom plate are integrally formed, and the outer cylinder is buckled and arranged on the bottom plate;

[0022] An outer cylinder fixing ring is sleeved outside the outer cylinder, a retaining ring for limiting the outer cylinder fixing ring is provided on the bottom plate, and the outer cylinder fixing ring locks and connects the outer cylinder body to the bottom plate;

[0023] A cover plate is arranged corresponding to the bottom plate and is buckled on the inner cylinder and the outer cylinder, and a rotating shaft hole is opened on the cover plate;

[0024] A connecting limit rod is arranged on the bottom plate and extends toward the cover plate. The cover plate is connected to the connecting limit rod by bolt locking.

[0025] In one embodiment of the present invention, a fixing block is provided on the outer cylinder fixing ring, and an outer cylinder fixing ring fixing groove is provided on the bottom plate; the outer cylinder fixing ring fixing groove and the fixing block are correspondingly arranged, and the fixing block can be inserted into the outer cylinder fixing ring fixing groove by rotating the outer cylinder fixing ring;

[0026] The outer cylinder fixing ring is also provided with a rotating handle.

[0027] In one embodiment of the present invention, the cover plate is further provided with an inner cylinder positioning block, and an inner cylinder positioning groove matching the inner cylinder positioning block is provided at the connection position between the inner cylinder body and the cover plate.

[0028] In one embodiment of the present invention, the bottom plate and the cover plate are respectively provided with an outer cylinder lower positioning block and an outer cylinder upper positioning block, and an outer cylinder positioning groove matching the outer cylinder lower positioning block and the outer cylinder upper positioning block is provided at the connection position between the outer cylinder body and the bottom plate and the cover plate.

[0029] In one embodiment of the present invention, a plurality of outer cylinder lower positioning blocks and outer cylinder upper positioning blocks are disposed on the bottom plate and the cover plate, and the plurality of outer cylinder lower positioning blocks and outer cylinder upper positioning blocks are unevenly distributed.

[0030] The above technical solution of the present invention has the following advantages compared with the prior art:

[0031] The resistance valve of the present invention forms a multi-layer spiral plastic pipe accommodating space by the cooperation of the inner cylinder and the outer cylinder, increases the clamping length of the plastic pipe by the spiral winding method, and provides appropriate resistance to the plastic pipe by the radial deformation of the cylinder, thereby providing the back pressure required for the operation of the pump connected to the pipe, reducing the influence on the flowing medium in the plastic pipe;

[0032] The resistance valve of the present invention changes the pressure not only by changing a single parameter of the pipeline radius, but also by changing two parameters, the pipeline length and the pipeline flow cross-sectional area, thereby improving the adjustable pressure range and the pressure regulation accuracy.

[0033] The resistance valve of the present invention provides pressure in the radial direction, and can provide a certain resistance without flattening the plastic pipe, and can avoid blood damage caused by non-physiological shear stress caused by squeezing to a certain extent;

[0034] The present invention has a longer plastic pipe accommodating space and can store more liquids at the same time when used as a resistance valve to replace the two components of the resistance valve and the liquid storage device in the circuit, thereby simplifying the circuit structure to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0036] Figure 1 It is a schematic diagram of the overall structure of the resistance valve of the present invention;

[0037] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the resistance valve of the present invention;

[0038] Figure 3 It is a schematic diagram of the explosion structure of the resistance valve of the present invention;

[0039] Figure 4 It is a structural schematic diagram of the inner cylinder and the bottom plate of the present invention;

[0040] Figure 5 It is a structural schematic diagram of the slider of the present invention;

[0041] Figure 6 It is a structural schematic diagram of the rotating shaft of the present invention;

[0042] Figure 7 It is a structural schematic diagram of the outer cylinder of the present invention;

[0043] Figure 8 It is a structural schematic diagram of the cover plate of the present invention;

[0044] Fig. 9 It is a schematic structural diagram of the outer cylinder fixing ring of the present invention.

[0045] Description of the accompanying drawings: 1. Bottom plate; 11. Lower positioning block of outer cylinder; 12. Clamping groove of outer cylinder fixing ring; 13. Retaining ring; 14. Connecting limit rod; 2. Inner cylinder; 21. Deformation slide groove; 22. Outer spiral groove; 23. Deformation groove; 24. Positioning groove of inner cylinder; 3. Outer cylinder; 31. Inner spiral groove; 32. Inlet and outlet hole; 33. Buckle structure; 34. Positioning groove of outer cylinder; 4. Fixing ring of outer cylinder; 41. Fixing block ; 42. Rotating handle; 43. Z-shaped slot; 5. Slider; 51. Inclined surface; 52. Trapezoidal nut; 53. Slider cover; 6. Rotating shaft; 61. Lower sleeve; 62. Bearing; 63. Bearing cover; 64. Upper sleeve; 65. Handle; 7. Cover; 71. Rotating shaft hole; 72. Connecting rod hole; 73. Inner tube positioning block; 74. Outer tube upper positioning block; 8. Plastic pipe accommodating space; 9. Butterfly screw. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0047] Reference Figure 1 to Figure 3As shown, the present invention discloses a resistance valve, comprising: a bottom plate 1, an inner cylinder 2 arranged on the bottom plate 1, an outer cylinder 3 sleeved outside the inner cylinder 2, an outer cylinder fixing ring 4 lockingly connecting the outer cylinder 3 and the bottom plate 1, a slider 5 arranged in the inner cylinder 2, a rotating shaft 6 driving the slider 5 to slide in the inner cylinder 2, and a cover plate 7 buckled on the inner cylinder 2 and the outer cylinder 3; wherein: the inner cylinder 2 is a cylindrical structure, the inner cylinder 2 can be deformed outwardly in the radial direction, an inclined deformation slide groove 21 is arranged inside the inner cylinder 2, the slider 5 has an inclined surface 51 matching the deformation slide groove 21, and the rotating shaft 6 is arranged In the inner cylinder 2, the rotating shaft 6 passes through the slider 5 and is threadedly connected with the slider 5. The rotating shaft 6 drives the slider 5 to slide along the axial extension direction of the rotating shaft 6. The slider 5 slides in the inner cylinder 2 along the extension direction of the deformation slide groove 21. The inclined surface 51 of the slider 5 abuts against the deformation slide groove 21, and the inner cylinder 2 is pushed by the slider 5 to deform outward in the radial direction; a semicircular outer spiral groove 22 is provided on the outer wall of the inner cylinder 2, and a semicircular inner spiral groove 31 is provided on the inner wall of the outer cylinder 3. The inner spiral groove 31 cooperates with the outer spiral groove to form a multi-layer spiral plastic pipe accommodating space 8;

[0048] The plastic pipe is wound between the inner cylinder 2 and the outer cylinder 3 along the multi-layer spiral plastic pipe accommodating space 8, and the back pressure is provided by relying on the resistance loss along the plastic pipe itself and the local resistance loss at the bend. At the same time, the slider 5 pushes the inner cylinder 2 to deform radially, and the plastic pipe is clamped in a gradually contracting and expanding manner to further supplement the back pressure, which avoids the influence of the local stenosis structure on the blood damage. The above embodiment not only changes the pressure by changing the parameter of the pipe radius, but also changes the pressure by changing the two parameters of the pipe length and the pipe flow cross-sectional area at the same time, which can improve the adjustable pressure range and the pressure regulation accuracy; the radial deformation of the inner cylinder 2 provides radial pressure, which can provide a certain resistance without flattening the plastic pipe, and can avoid blood damage caused by non-physiological shear stress caused by extrusion to a certain extent; and the resistance valve of this embodiment has a longer plastic pipe accommodating space 8, which can store more liquid at the same time when used as a resistance valve, so as to replace the two components of the resistance valve and the liquid reservoir in the circuit, and can simplify the circuit structure to a certain extent.

[0049] According to Poiseuille's law in fluid mechanics and the Poiseuille's law formula: Q = π × r^4 × Δp / (8ηL), the flow resistance is defined as R = 8ηL / (πr^4);

[0050] When the flow rate Q, the viscosity coefficient η of the liquid, and the length of the pipe L are constant, the flow resistance R is inversely proportional to the fourth power of the pipe radius r. This shows that the pipe radius has a great influence on the flow resistance. Therefore, the adjustment accuracy of the traditional resistance valve that only changes the radius of the plastic pipe is not high.

[0051] When the flow rate Q, the viscosity coefficient η of the liquid, and the pipe radius r are constant, the pipe length L is proportional to the flow resistance R, which means that back pressure can be provided by extending the pipe length.

[0052] The technical solution of this embodiment is obtained based on the analysis of Poiseuille's law mentioned above. The radial deformation of the inner cylinder 2 is used to extrude the plastic pipe as a whole along the length direction of the plastic pipe, so as to avoid fixed-point extrusion to form a narrow structure with a small cross-sectional area. The spiral winding method can further increase the pipe length and provide the back pressure required for the loop pipe, thereby reducing the impact on the flowing medium in the pipe.

[0053] Reference Figure 4 As shown, in this embodiment, the inner cylinder 2 and the bottom plate 1 are integrally formed. In order to realize the deformation of the inner cylinder 2 in the radial direction, a plurality of deformation grooves 23 are opened on the side wall of the inner cylinder 2. The deformation grooves 23 are arranged along the axial extension direction of the inner cylinder 2. The plurality of deformation grooves 23 are evenly distributed around the circumference of the inner cylinder 2. When the side wall of the inner cylinder 2 is squeezed by the slider 5, the deformation grooves 23 open, thereby increasing the diameter of the inner cylinder 2.

[0054] Specifically, in this embodiment, the outer cylinder 3 is sleeved outside the inner cylinder 2, and the outer cylinder 3 also needs to be connected to the bottom plate 1. Therefore, an outer cylinder lower positioning block 11 for limiting the outer cylinder 3 is provided on the bottom plate 1. The outer cylinder 3 is placed on the bottom plate 1 and is locked and connected to the bottom plate 1 through the outer cylinder fixing ring 4. Therefore, an outer cylinder fixing ring groove 12 and a retaining ring for limiting the outer cylinder fixing ring 4 are also provided on the bottom plate 1.

[0055] Specifically, in this embodiment, during assembly, since the inner spiral groove 31 on the inner wall of the outer cylinder 3 needs to cooperate with the outer spiral groove on the outer wall of the inner cylinder 2, there is only one positional relationship between the outer cylinder 3 and the inner cylinder 2. In order to ensure the accuracy of the position of the outer cylinder 3, a plurality of outer cylinder lower positioning blocks 11 are provided on the bottom plate 1. The plurality of outer cylinder lower positioning blocks 11 are unevenly distributed, so that there is only one positional connection relationship between the outer cylinder 3 and the bottom plate 1.

[0056] Specifically, in this embodiment, the cover plate 7 is buckled on the inner cylinder 2, and therefore, an inner cylinder positioning groove 24 is provided at the connection between the upper edge of the inner cylinder 2 and the cover plate 7. The cover plate 7 is buckled on the inner cylinder 2, and the position of the cover plate 7 is limited by the inner cylinder positioning groove 24.

[0057] Specifically, in order to achieve the connection between the cover plate 7 and the inner cylinder 2, in the present embodiment, a connecting limit rod 14 is further provided on the base plate 1, the connecting limit rod 14 is provided in the inner cylinder 2, the connecting limit rod 14 is extended in the direction of the cover plate 7, the cover plate 7 is locked and connected to the connecting limit rod 14 by a butterfly screw 9, so as to achieve the fixation of the cover plate 7; in the present embodiment, the connecting limit rod 14 not only plays the role of fixing the cover plate 7, but also the connecting limit rod 14 is provided in the inner cylinder 2, the connecting limit rod 14 passes through the slider 5, so that the slider 5 slides in the inner cylinder 2 along the extension direction of the connecting limit rod 14, therefore, the connecting limit rod 14 also plays the role of limiting and guiding the slider 5.

[0058] Reference Figure 5 As shown, in this embodiment, in order to realize the threaded connection between the slider 5 and the rotating shaft 6, a trapezoidal nut 52 is embedded in the center position of the slider 5, and the trapezoidal nut 52 is limited and fixed in the slider 5 by a slider cover plate 53, and the slider cover plate 53 is connected to the slider 5 by threads.

[0059] Reference Figure 6 As shown, in the present embodiment, in order to realize the connection between the rotating shaft 6 and the base plate 1, a lower sleeve 61 and a bearing 62 are provided at the connecting end between the rotating shaft 6 and the base plate 1, one end of the lower sleeve 61 is sleeved outside the rotating shaft 6 and connected to the rotating shaft 6, the other end of the sleeve is inserted into the bearing 62, the bearing 62 is embedded in the base plate 1, the bearing 62 is fixed in the base plate 1 through the bearing cover plate 63, the bearing cover plate 63 is connected to the base plate 1 through threads, the connection between the rotating shaft 6 and the base plate 1 is realized through the sleeve and the bearing 62, and at the same time, it can also ensure that the rotating shaft 6 can rotate relative to the base plate 1; in order to realize the connection between the rotating shaft 6 and the cover plate 7, an upper sleeve 64 is provided at the connecting end between the rotating shaft 6 and the cover plate 7.

[0060] Specifically, in order to facilitate the rotation of the rotating shaft 6 , a handle 65 is further provided at the end of the rotating shaft 6 .

[0061] Reference Figure 7As shown, the side wall of the outer cylinder 3 is provided with a plurality of inlet and outlet holes 32, and the plurality of inlet and outlet holes 32 are respectively connected to the plastic pipe accommodating spaces 8 located at different layers, and the plastic pipes enter and exit from the inlet and outlet holes 32. In this embodiment, a total of seven layers of spiral plastic pipe accommodating spaces 8 are provided, and six inlet and outlet holes 32 are correspondingly provided on the side wall of the outer cylinder 3. The six inlet and outlet holes 32 are respectively located in the plastic pipe accommodating spaces 8 of the 1st, 2nd, 3rd, 5th, 6th, and 7th layers, so that the plastic pipes can be The plastic pipe is wound in the plastic pipe accommodating space 8 according to the specified number of turns. For example, when the number of turns of the plastic pipe is 3, the two ends of the plastic pipe can pass through the inlet and outlet holes 32 of the 3rd and 5th layers respectively; when the number of turns of the plastic pipe is 5, the two ends of the plastic pipe can pass through the inlet and outlet holes 32 of the 2nd and 6th layers respectively; when the number of turns of the plastic pipe is 7, the two ends of the plastic pipe can pass through the inlet and outlet holes 32 of the 1st and 7th layers respectively;

[0062] In other embodiments, different layers of plastic pipe accommodating spaces 8 and inlet and outlet holes 32 corresponding to different layer positions can be provided according to actual use requirements to achieve more combinations of winding requirements.

[0063] Specifically, in order to facilitate disassembly and installation, in the present embodiment, the outer cylinder 3 is configured to be a cylindrical structure formed by splicing a plurality of arc pieces end to end, and a snap-fit ​​structure 33 is provided between two connected arc pieces.

[0064] Specifically, the outer cylinder 3 is first placed on the base plate 1, and then the cover plate 7 is buckled on the outer cylinder 3. In order to achieve the connection between the outer cylinder 3 and the base plate 1 and the cover plate 7, an outer cylinder positioning groove 34 is provided at the connection position between the outer cylinder 3 and the base plate 1 and the cover plate 7.

[0065] Reference Figure 8 As shown, in the present embodiment, the rotating shaft 6 protrudes from the inner cylinder 2, and the protruding part of the rotating shaft 6 passes through the cover plate 7, so a rotating shaft hole 81 for the rotating shaft 6 to pass through is opened on the cover plate 7; and, in the present embodiment, the connecting limit rod 14 also needs to pass through the cover plate 7, and then the cover plate 7 is locked and connected to the connecting limit rod 14 by bolts, so a connecting rod hole 82 is also opened on the cover plate 7.

[0066] Specifically, in order to realize the connection between the cover plate 7 and the inner cylinder 2 and the outer cylinder 3, an inner cylinder positioning block 83 and an outer cylinder upper positioning block 84 are also provided on the cover plate 7, and the inner cylinder positioning block 83 is matched with the inner cylinder positioning groove 24 on the inner cylinder 2, and the outer cylinder upper positioning block 84 is matched with the outer cylinder positioning groove 34 on the outer cylinder 3.

[0067] Specifically, in this embodiment, during assembly, in order to ensure that there is only one positional relationship between the cover plate 7 and the outer cylinder body 3 and the inner cylinder body 2, a plurality of outer cylinder upper positioning blocks 84 are provided on the cover plate 7, and the plurality of outer cylinder upper positioning blocks 84 are unevenly distributed, so that there is only one positional connection relationship between the cover plate 7 and the outer cylinder body 3.

[0068] Reference Fig. 9 As shown, in this embodiment, the outer cylinder body 3 is locked and fixed on the base plate 1 by the outer cylinder fixing ring 4. Therefore, a fixing block 41 is provided on the outer cylinder fixing ring 4. The fixing block 41 cooperates with the outer cylinder fixing ring groove 12 provided on the base plate 1. Rotating the outer cylinder fixing ring 4 can insert the fixing block 41 into the outer cylinder fixing ring groove 12, thereby realizing a quick connection between the outer cylinder fixing ring 4 and the base plate 1.

[0069] Specifically, in order to facilitate the rotation of the outer cylinder fixing ring 4, a rotating handle 42 is also provided on the outer cylinder fixing ring 4;

[0070] Specifically, in the embodiment, in order to facilitate the installation of the outer cylinder fixing ring 4, the outer cylinder fixing ring 4 is also formed by splicing a plurality of arc-shaped ring bodies end to end, and two adjacent arc-shaped ring bodies are connected by a Z-shaped slot 43.

[0071] The installation process of the resistance valve of this embodiment is as follows:

[0072] 1. Preparation of the slider 5 : Place the trapezoidal nut 52 into the center groove of the slider 5 , and screw the slider cover 53 into the thread of the center groove to fix the trapezoidal nut 52 in the slider 5 .

[0073] 2. Installation of the rotating shaft 6: Place the lower shaft sleeve 61 into the shaft end slot on the lower side of the base, connect the bearing 62 to the rotating shaft 6, then place the assembled rotating shaft 6 through the opening on the lower side of the base, and securely connect the bearing 62 to the base, and finally screw the bearing cover plate 63 into the center groove thread.

[0074] 3. Screw the slide 5 into the rotating shaft 6.

[0075] 4. Place the upper shaft sleeve 64 into the rotating shaft hole 81 of the cover plate 7.

[0076] 5. Wind the plastic pipe into the outer spiral groove of the inner cylinder 2 according to the specified number of turns (3 / 5 / 7 turns).

[0077] 6. Place the outer cylinder 3 on the base according to the arrangement of the positioning blocks 11 below the outer cylinder, with both ends of the plastic pipe passing through the inlet and outlet.

[0078] 7. Install the outer cylinder fixing ring 4 into the corresponding position of the base, and then use the rotating handle 42 to rotate the outer cylinder fixing ring 4 to the locking position to achieve locking of the outer cylinder body 3.

[0079] 8. Install the cover plate 7 onto the inner cylinder body 2 and the outer cylinder body 3 according to the distribution of the inner cylinder positioning grooves 24 and the outer cylinder positioning grooves 34 .

[0080] 9. Use the butterfly screw 9 to lock the cover plate 7 onto the connection limit rod 14.

[0081] 10. Install the handle 65 onto the rotating shaft 6.

[0082] The method for using the resistance valve of this embodiment includes:

[0083] After installation, the handle 65 can be rotated clockwise to drive the slider 5 to move downward, thereby causing the inner cylinder 2 to deform radially outward to achieve the effect of clamping the plastic pipe and providing considerable resistance for the circuit;

[0084] After clamping, the handle 65 can be rotated counterclockwise to drive the slider 5 to move upward, thereby causing the inner cylinder 2 to deform radially inward to achieve the effect of loosening the plastic pipe and achieving the purpose of reducing resistance for the circuit.

[0085] Specifically, in this embodiment, the bottom plate 1, the inner cylinder 2, the outer cylinder 3, the outer cylinder fixing ring 4, the slider 5, and the cover plate 7 can all be processed by 3D printing, injection molding, and other technologies;

[0086] In the produced samples, the inner cylinder 2 needs to withstand bending deformation and large radial force, and is made of high-toughness nylon through 3D printing. For the slider 5, since it has an embedded trapezoidal nut 52 and is subjected to radial pressure at the same time, nylon plus glass fiber can be selected for 3D printing.

[0087] Considering that the torsional strength of the rotating shaft 6 prepared by 3D printing is insufficient, the rotating shaft 6 needs to be made of steel to meet the torsional strength requirements.

[0088] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A resistance valve used to provide resistance to liquid in a plastic pipe. It is characterized in that include: An inner cylinder, which is a cylindrical structure and can be deformed outward in a radial direction. A semi-elliptical outer spiral groove is provided on the outer wall of the inner cylinder, and an inclined deformation slide groove is provided inside the inner cylinder; A slider is arranged in the inner cylinder, the slider has an inclined surface matching the deformation slide groove, the slider slides in the inner cylinder along the extension direction of the deformation slide groove, the inclined surface of the slider abuts against the deformation slide groove, and the inner cylinder is pushed to deform outward in the radial direction by the slider; A rotating shaft is arranged in the inner cylinder, the rotating shaft passes through the slider and is threadedly connected with the slider, and the rotating shaft drives the slider to slide along the axial extension direction of the rotating shaft; The outer cylinder is sleeved on the inner cylinder, and a semi-elliptical inner spiral groove is provided on the inner wall of the outer cylinder. The inner spiral groove cooperates with the outer spiral groove to form a multi-layer spiral plastic pipe accommodating space; a plurality of inlet and outlet holes are provided on the side wall of the outer cylinder, and the plurality of inlet and outlet holes correspond to and connect the plastic pipe accommodating spaces located in different layers, and the plastic pipes enter and exit from the inlet and outlet holes.

2. The resistance valve according to claim 1, Features: A plurality of deformation grooves are provided on the side wall of the inner cylinder. The deformation grooves are arranged along the axial extension direction of the inner cylinder. The plurality of deformation grooves are evenly distributed around the circumference of the inner cylinder.

3. The resistance valve according to claim 1, Features: The outer cylinder body is formed by splicing a plurality of arc pieces end to end to form a cylindrical structure, and a buckle structure is arranged between two connected arc pieces.

4. The resistance valve according to claim 1, Features: The rotating shaft partially protrudes from the inner cylinder, and a handle is provided at one end of the rotating shaft protruding from the inner cylinder.

5. The resistance valve according to claim 1, Features: Also includes: A bottom plate, the inner cylinder and the outer cylinder are both arranged on the bottom plate, the inner cylinder and the bottom plate are integrally formed, and the outer cylinder is buckled and arranged on the bottom plate; An outer cylinder fixing ring is sleeved outside the outer cylinder, a retaining ring for limiting the outer cylinder fixing ring is provided on the bottom plate, and the outer cylinder fixing ring locks and connects the outer cylinder body to the bottom plate; A cover plate is arranged corresponding to the bottom plate and is buckled on the inner cylinder and the outer cylinder, and a rotating shaft hole is opened on the cover plate; A connecting limit rod is arranged on the bottom plate and extends toward the cover plate. The cover plate is connected to the connecting limit rod by bolt locking.

6. The resistance valve according to claim 5, Features: The outer cylinder fixing ring is provided with a fixing block, and the bottom plate is provided with an outer cylinder fixing ring fixing groove; the outer cylinder fixing ring fixing groove and the fixing block are arranged correspondingly, and the fixing block can be inserted into the outer cylinder fixing ring fixing groove by rotating the outer cylinder fixing ring; The outer cylinder fixing ring is also provided with a rotating handle.

7. The resistance valve according to claim 5, Features: The cover plate is also provided with an inner cylinder positioning block, and an inner cylinder positioning groove matching the inner cylinder positioning block is provided at the connection position between the inner cylinder body and the cover plate.

8. The resistance valve according to claim 5, Features: The bottom plate and the cover plate are respectively provided with an outer cylinder lower positioning block and an outer cylinder upper positioning block, and an outer cylinder positioning groove matching the outer cylinder lower positioning block and the outer cylinder upper positioning block is provided at the connection position between the outer cylinder body and the bottom plate and the cover plate.

9. The resistance valve according to claim 8, Features: A plurality of outer cylinder lower positioning blocks and outer cylinder upper positioning blocks are arranged on the bottom plate and the cover plate, and the plurality of outer cylinder lower positioning blocks and outer cylinder upper positioning blocks are arranged in an uneven distribution.

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