Tube for pinch valve, pinch valve and powder gas injection device having such a tube, and method for producing such a tube for pinch valve

Abstract

A tube (10) for clamping valve (1), specifically incorporated into a powder gas injection device (100), the tube (10) having an internal passage (11) for conveying a medium under pressure along the delivery direction (T) in an operating mode, the tube (10) having an inner bend that defines the circumference of the internal passage (11) in a cross-section of the tube (10) along a plane perpendicular to the internal passage (T), the shape of the tube (10) being configured such that the inner bend (13) at least presents a constricted section, which in an operating mode is subjected to a deformation force that tends to contact the constricted section of the inner bend (13).

Description

Technical Field

[0001] The present invention relates to a tube for a clamping valve, a clamping valve and a powder gas injection device having such a clamping valve, and a method for producing such a tube for a clamping valve. Background Technology

[0002] Professional dental prevention is a maintenance treatment aimed at removing plaque and tartar that cannot be removed during routine home care. This process is important because plaque buildup can lead to dental diseases such as cavities, gingivitis, and periodontitis.

[0003] Air polishing is a dental preventative procedure that involves spraying powder onto teeth using a combination of air and liquid streams, typically water. Advantages of air polishing include its ability to reach hard-to-reach areas such as interdental spaces, gum pockets, and around braces, implants, and orthodontic appliances. Air polishing is an effective method because it requires neither repetitive movements nor different stages. It is also faster and requires relatively less training than other methods.

[0004] For air polishing, powder gas jetting devices are generally used, such as those disclosed, for example, in EP 3265015 A1. Such powder gas jetting devices typically include a handheld component, a powder chamber, and a generally stationary unit. The powder gas jetting device mixes powder with gas to form a powder-gas mixture, typically surrounded by a water stream or jet, which is then jetted by the handheld component during operation. A foot pedal can be used to actuate the powder gas jetting device.

[0005] To obtain all the benefits of air polishing, the powder flow needs to be managed without wear. Because the powder is an abrasive material, it is difficult to find a system that allows the powder flow to be blocked without any wear on the valve system. When the valve system wears down, the powder is sprayed everywhere until the system stops. The challenge for such valve systems is that the powder is an abrasive material capable of penetrating into any moving parts to block or wear them down. Furthermore, any connecting parts with powder are areas where powder can accumulate and eventually clog the system.

[0006] Currently, there are two alternative solutions to address the aforementioned problem. According to the first alternative, the gas flow is blocked upstream of the powder chamber, so that the valve does block the gas, such as air, but it doesn't actually begin contact with the powder. This solves the valve wear problem, but makes the entire prevention process more difficult: each time the foot pedal is pressed to actuate the powder gas injection device, the powder chamber needs to be filled with gas first and then emptied. Therefore, the system operates with a delay of several seconds between the pedal press and the treatment. This process can only be established for relatively small powder chambers. If the powder chamber volume increases, the delay becomes even longer (>5 seconds), making the aforementioned solution unsuitable for prevention processes.

[0007] Therefore, the idea of ​​obstructing airflow upstream of the powder chamber results in a longer delay between pedal pressing and device activation. This is detrimental to application, treatment accuracy, and safety. For example, if the user removes the handpiece before the powder chamber is emptied, powder will be sprayed everywhere and may even get into the eyes.

[0008] According to the second alternative, the powder flow can be blocked downstream of the powder chamber to overcome the delay problem between pressing the foot pedal and injecting the powder-gas mixture, as described above. Using a standard valve makes the powder-gas injection device unreliable. Powder will enter the moving part of the valve and cause wear. Furthermore, variations in the valve's geometry are potential clogging areas that tend to obstruct the valve.

[0009] The results show that using a clamping valve is a reliable means of controlling gas / powder mixtures because no disturbance occurs in the powder flow when the valve is open. Using a clamping valve is optimal for powder processes because no geometric changes interfere with the powder flow during operation.

[0010] Specifically, the results show that the particles of the gas / powder mixture create small slits on the inner side of the clamping valve tube when the tube is compressed. Therefore, in operating mode, the internal pressure inside the channel generates forces that tend to elongate the entire inner side of the tube and, in particular, tend to extend the slits created by the particles of the conveyed gas / powder mixture.

[0011] In view of the above, the object of the present invention is to provide a tube that does not support the extension or continuation of the cut located on the inner side of the tube, especially when the tube is compressed and cuts or cracks are generated by powder or particles.

[0012] The problem is solved by the pipe according to claim 1, the clamping valve according to claim 11, the method according to claim 12, and the powder gas injection device according to claim 14. Preferred embodiments are incorporated in the dependent claims, the specification, and the drawings. Summary of the Invention

[0013] According to a first aspect of the invention, a tube for a clamping valve, particularly incorporated into a powder gas injection device, is provided, the tube having an internal passage for conveying a medium under pressure along a delivery direction in an operating mode, the tube having an inner bend that defines the circumference of the internal passage in a cross-section of the tube along a plane perpendicular to the internal passage, the tube being shaped such that the inner bend at least presents a constricted section that is subjected to a deformation force in an operating mode that tends to contact the constricted section of the inner bend.

[0014] In contrast to the prior art, the tube according to the invention includes a contraction section in which an inward bend is formed along the inner side of the tube. As a result, the shape of the tube can create a contraction section along the inward bend that counteracts tensile stresses that should be avoided because these stresses would enhance the growth and propagation of cracks after particles of the medium, particularly powder / gas mixtures, have caused small cracks or cuts in the material of the tube, for example, made of rubber. Therefore, the tube according to the invention can reduce the risk of the continuation of cracks or cuts, for example, caused by the transported medium. This increases the lifespan of the tube used in clamping valves. In particular, since the contraction section, preferably located in an area where cuts caused by powder / gas mixtures are prone to occur, counteracts these forces that would otherwise elongate the inner side of the internal channel, the elongation of cuts caused by the powder / gas mixture, or more precisely, cuts caused by particles of the powder / gas mixture, during operation, i.e., during passage through the internal channel of the tube, is avoided. The inner side forms the area of ​​the internal channel, while the inward bend defines a line.

[0015] Specifically, the tube's shape also exists in a non-compression state, in which, for example, the medium conveyed through the internal channel and the actuating mechanism acting on the tube to close the internal channel do not act on the tube to prevent it from being compressed. In other words, the shape of the tube that causes the contraction section is not a result of the current deformation of the tube being applied.

[0016] Preferably, the "contraction" establishes a force oriented along the circumferential direction and along the inner bend, particularly causing at least two segments of the contraction section to tend to move toward each other when a crack or cut forms between them. Therefore, the continuation and expansion of the crack or fissure can be advantageously avoided. Specifically, the contraction section is established in two opposing portions of the inner bend of the pipe.

[0017] Furthermore, preferably, the inner bend includes two constricted sections, such as a first constricted section and a second constricted section, that are diametrically opposed to each other. Specifically, the two constricted sections are located on opposite sides of the inner bend of the internal channel. In particular, the tube has elasticity to support the formation of the constricted sections.

[0018] According to a preferred embodiment, in order to form the contraction section, the thickness and / or radius of curvature of the tube distributed to the inner bend varies along the circumferential direction. Results show that these modifications to the tube shape, particularly those involving modifications to the cross-section of the tube and / or internal channels in a plane perpendicular to the conveying direction, can establish the contraction section, thereby giving the tube a tendency to contract along the circumferential direction at the inner bend.

[0019] Preferably, the cross-section of the internal channel has a non-circular cross-section, particularly an elliptical cross-section, in the non-extruded state. It has been shown that using an elliptical cross-section is a simple way to achieve the contraction section, particularly by realizing a pre-formed tube including the contraction section.

[0020] According to a preferred embodiment of the invention, in the non-compression state, the cross-section of the internal channel has a first axis and a second axis, the second axis being non-parallel to the first axis and preferably perpendicular to it, wherein the ratio of the first axis to the second axis has a value between 0.1 and 0.95, preferably between 0.2 and 0.8, and more preferably between 0.4 and 0.8, even more preferably between 0.55 and 0.8. Results show that establishing this geometry, particularly for this ratio between 0.55 and 0.8, can significantly increase the lifespan of the tube, especially compared to tubes with a circular cross-section.

[0021] Preferably, the cross-section of the internal channel in a plane perpendicular to the conveying direction roughly corresponds to a Cassini oval shape. This shape proves suitable for establishing an advantageous shape for forming the contraction section.

[0022] The tube is preferably pre-formed to provide the shrinkage section. Such a tube can be obtained from a tube with an internal channel having a perfectly circular cross-section in its original state. Through specific treatments applied to the tube, such as heat treatment, the tube remains in a pre-formed state, or even in a non-extruded state, during deformation.

[0023] Specifically, the following test has been performed: in which the tube is inserted into a standard air polishing device, such as the applicant's. In the apparatus, powder is forced through a tube under pressure. This apparatus has already been used. powder, this The powder comprises glycine in the form of small-sized powder, meaning powder with particles or granules having an average size of approximately 10 μm to 100 μm. One cycle consists of three seconds in the closed state and three seconds in the open state of the clamping valve, and this cycle has been used to apply stress to the tube of the clamping valve. Results show that the life of the tube without the contraction section is approximately 38,000 clamping cycles, while the life of the clamping valve with the contraction section is approximately 135,000 clamping cycles.

[0024] Specifically, the radius of curvature of the inner bend varies along the circumferential direction, wherein the curvature of the inner bend, defined as the reciprocal of the radius of curvature, is less than 1 1 / mm, more preferably less than 0.5 1 / mm, or most preferably less than 0.1 1 / mm, or even a negative value. Preferably, the radius of curvature has a maximum value in a region where the tube is positioned adjacent to or near an actuating mechanism that acts on the tube during operation when it is in an actuated or compressed state. For example, the curvature has a value of 0 to 1 / mm, i.e., the inner bend is at least partially flat. It should even be considered that the curvature of the protrusion distributed to the inner side of the internal channel has a negative value.

[0025] It is also conceivable that the internal bend includes a protrusion facing the center of the tube passage. In this case, a "boob" or recess is formed internally to support the formation of the contraction section. Furthermore, according to another aspect of the invention, the material in the relevant region, i.e., the region near the actuating mechanism that interacts with the tube, is increased, thereby increasing the thickness of the tube, i.e., the thickness of the tube wall, which increases the lifespan of the tube and thus increases the durability of the clamping valve.

[0026] Preferably, the material properties of the tube change along the inner bend. For example, the E-type mold of the tube material changes along a direction perpendicular to the conveying direction and / or along the inner bend used to create the contraction section. Preferably, the tube is made of polyurethane (PUR). Many tube materials have been tested, and the results mainly indicate that PUR is the most stable material. Therefore, the life of the clamping valve, and especially the life of the tube, can be further increased.

[0027] Furthermore, it is conceivable that the inner portion is at least partially coated, particularly in the region of the tube located within the actuation mechanism of the clamping valve. Preferably, the first and / or second contraction sections are coated. For example, the coating makes the inner portion of the tube more resistant to powder. Therefore, the lifespan of the clamping valve can be further increased.

[0028] According to another aspect of the invention, a clamping valve is provided, comprising a tube according to the invention. Preferably, the clamping valve includes an actuation mechanism for establishing a non-crushed state and a crushed state, wherein, in the actuated or crushed state, the internal passage has a reduced cross-section or is closed. In particular, during the actuated state, the tube is crushed by the actuation mechanism.

[0029] According to another embodiment, the actuation mechanism comprises a first portion and a second portion arranged opposite to each other, wherein the actuation mechanism is configured to change the distance between the first portion and the second portion. Specifically, a tube is located between the first portion and the second portion to open or close the internal passage, wherein a first constricted section of the tube is positioned adjacent to the first portion and a second constricted section of the tube is positioned adjacent to the second portion, wherein the first constricted section and / or the second constricted section substantially comprises a constricted section. Preferably, a first axis of the cross-section extends parallel to the direction of movement of the first and second portions of the actuation mechanism, while a second axis of the cross-section extends perpendicular to the first axis.

[0030] It is also conceivable that the clamping valve is used to control large-volume injections of powder-gas mixtures, i.e., the clamping valve functions as a proportional valve. Preferably, the contraction occurs only in the defined section of the inner bend or the inner side of the internal passage of the tube, particularly in the area near the portion of the actuating mechanism that deforms the tube during operation. Since the actuating mechanism of the clamping valve typically results in tensile stress in a specific area of ​​the tube, it is advantageous that the clamping valve according to the invention establishes a contraction to counteract said tensile stress, which would otherwise cause cracks or cuts at the inner side of the tube to continue or increase. Therefore, the tube life of the clamping valve can be increased by more than two or even three times.

[0031] Preferably, a contraction section is established near or adjacent to a component of the actuation mechanism that interacts with the tube. Preferably, the tube passes through or extends through the actuation mechanism. The clamping valve may also be integrated into a connecting unit intended to connect the handpiece to the fixed unit.

[0032] For example, the clamping valve is integrated into the fixing unit of the powder gas injection device and / or into the connecting unit that connects the handpiece of the powder gas injection device to the fixing unit. Preferably, the fixing unit further includes a powder chamber that is removably connected to the outside of the housing of the fixing unit. In particular, the tube or clamping valve is configured such that the tube itself establishes at least a partial contraction in the contraction section, which would otherwise experience tensile or stretching stress in the operating state.

[0033] Another aspect of the invention is a method for producing a tube according to the invention, the method comprising a heat treatment for establishing compressive stresses acting on the inner side of the tube. All features and benefits discussed in the context of clamping valves and tubes are similarly applicable to this method, and all features and benefits discussed in the context of this method are similarly applicable to clamping valves and tubes.

[0034] According to yet another embodiment, the heat treatment includes:

[0035] The tube is heated to a temperature between 40°C and 500°C, preferably between 60°C and 200°C, and most preferably between 80°C and 100°C. Heating is particularly required for 0 to 30 minutes, preferably 1 to 20 minutes, and most preferably 1 to 10 minutes.

[0036] The tube is cooled to a temperature between 1°C and 50°C, preferably between 5°C and 50°C, and most preferably between 15°C and 25°C. Immediately after heating, the pre-deformed tube is placed in a cold water bath at a temperature between 10°C and 25°C to fix its shape. Specifically, a deformation tool is used to introduce deformation relative to the original circular shape of the tube's cross-section. The deformation of the tube is established before or during heating and is maintained at least temporarily during cooling. In particular, after the cooling deformation tool is removed, the tube retains the desired shape, i.e., the pre-formed shape. Results show that heat treatment can reduce the internal stress within the tube, making the effect of the compressive stress established by the tube's shape more pronounced.

[0037] Preferably, the tube is placed in a mold or fixture for altering its cross-section and / or for altering its internal stress. Specifically, when the tube is placed inside the mold or fixture, it is subjected to a heat treatment comprising a first stage and a second stage, with the temperature during the first stage being higher than the temperature during the second stage. To modify the shape of the tube, a hot fluid, such as hot water, is used during the first stage, while a cold fluid, such as cold water, is used during the second stage. Preferably, the inner portion of the mold / fixture at least partially corresponds to the overall route of the tube within the pump assembly in which it is intended.

[0038] Another aspect of the invention is a pump device, particularly a peristaltic pump, comprising a squeezing mechanism and a tube according to the invention, wherein the pump device is preferably integrated into a powder gas injection device. In particular, all the benefits and descriptions discussed in the context of the tube and the method for realizing the tube are similarly applicable to the pump device, and vice versa. Preferably, the tube has an oval cross-section.

[0039] Another aspect of the invention is a powder gas injection device including a clamping valve according to the invention, which preferably has a tube according to the invention. All the benefits and features discussed in the context of the clamping valve, the tube, and the method for realizing the tube are similarly applicable to the powder gas injection device. Preferably, the powder gas injection device includes a fixing unit, a handheld component, and a connecting unit for connecting the handheld component to the fixing unit, wherein the clamping valve is located inside the connecting unit.

[0040] Where not explicitly described, and without limiting or expanding the scope of the described invention, various embodiments or their aspects and features may be combined or interchanged with each other, provided that such combination or interchange is meaningful and in the sense of the invention. Where applicable, advantages described with respect to one embodiment of the invention are also advantages of other embodiments of the invention. Attached Figure Description

[0041] In the attached diagram:

[0042] Figure 1 The powder gas injection device according to a first exemplary embodiment of the present invention is schematically shown.

[0043] Figure 2 The diagram schematically illustrates a powder gas injection device including a clamping valve according to a first exemplary embodiment of the present invention.

[0044] Figure 3 The clamping valve (upper part) and pipe (lower part) according to a first exemplary embodiment of the present invention are schematically shown.

[0045] Figure 4 A tube according to a second exemplary embodiment of the present invention is illustrated schematically.

[0046] Figure 5 A pump assembly including a squeezing mechanism is schematically shown, and

[0047] Figure 6 It shows the method for forming a supply Figure 5 The mold for the pipes used in the pump device. Detailed Implementation

[0048] Figure 1A powder gas jetting device 100 according to a first exemplary embodiment of the present invention is schematically shown. This powder gas jetting device 100 is used for dental prevention by air polishing. Therefore, the powder gas jetting device 100 provides a powder gas mixture and jets the powder gas mixture onto the tooth surface via a handheld component 18 for the removal of biofilm and / or calculus. In addition to the handheld component 18 including a nozzle, the powder gas jetting device 100 preferably has a fixing unit 20, which can be, for example, mounted on a table and is intended to generate and provide a powder gas mixture for air polishing. Furthermore, the powder gas jetting device 100 includes at least one removable and particularly replaceable powder gas chamber 30, which can be connected to the fixing unit 20 for providing a specific powder used during dental treatment.

[0049] Specifically, the powder-gas mixture used during air polishing is formed inside the powder chamber 30 through the following steps: introducing gas, particularly air, into the powder chamber 30; mixing the gas with powder inside the powder chamber 30, for example, by utilizing the Venturi effect; and finally exiting the powder chamber 30 as a powder-gas mixture. A piping system is specifically used to deliver the powder-gas mixture to the handheld device 18. For example, the piping system includes a tube 10 for conveying the medium, i.e., the powder-gas mixture, and a sleeve tube 31 surrounding the tube 10 for conveying the powder-gas mixture. Preferably, the piping system including the sleeve tube 31 and the tube 10 is flexible, allowing the operator to easily orient the handheld device 18 in the desired position or orientation. Preferably, the piping system is connected to the stationary unit 20 via a coupling 50. For example, this coupling 50 is located at the front panel of the stationary unit 20. To control the application of the powder-gas mixture via the handheld device 18, a valve system is required that controls whether the powder-gas mixture is ejected through the handheld device 18. This valve system can be controlled by a foot pedal (not shown), which can be actuated by the operator.

[0050] This valve is preferably located downstream of the powder chamber 30 because otherwise, the action on the foot pedal and the injection of the powder-gas mixture from the handheld device 18 would be delayed due to the powder chamber 30 needing to be initially filled with gas. However, positioning the valve system downstream of the powder chamber 30 presents specific challenges in selecting a suitable valve system. Valve systems with specific mechanisms and comprising several mechanical components can interact with the powder in the powder-gas mixture, causing these systems to be frequently damaged by the powder accumulating within them. Therefore, it has been shown that placing the clamping valve 1 downstream of the powder chamber 30 is a good choice for a suitable valve system in the powder-gas injection device. Thus, the powder-gas mixture interacts only with the inner portion 12 of the tube 10, which is part of the clamping valve 1.

[0051] exist Figure 1 In the embodiment shown, the clamping valve 1 is located in the connecting unit 32, which is inserted into the fixing unit 20 at the coupling 50 for connecting the piping system to the fixing unit 20.

[0052] exist Figure 2 The clamping valve 1, integrated within the connecting unit 32, is shown in detail. Preferably, the connecting unit 32 includes a housing 33 covering the clamping valve 1 and is configured to insert into a corresponding engagement 50 of the fixing unit 20. Specifically, the connecting unit 32 includes at least: a first input channel 41 that allows a powder-gas mixture to enter the connecting unit 32; and a second input channel 42 that allows the supply of air or other gas for actuating the clamping valve 1. Figure 2 In the illustrated embodiment, the clamping valve 1 includes a first portion 21 and a second portion 22, configured such that the distance between the first portion 21 and the second portion 22 can be changed, thereby positioning the tube 10 between the first portion 21 and the second portion 22. Therefore, the internal passage 11 of the tube 10 can be opened and closed, or the cross-sectional dimensions of the internal passage 11 formed by the inner side portion 12 of the tube 10 can be changed. In the open state, the powder-gas mixture passes through the clamping valve 1 and is conveyed to the handheld device 18 via the conveying direction T. In the closed state, the path for the powder-gas mixture within the connecting unit 32 is blocked, so that no medium, i.e., no powder-gas mixture, can be conveyed to the handheld device 18.

[0053] exist Figure 2 In the illustrated embodiment, the actuation mechanism of the clamping valve 1 includes a moving portion 25 and a spring element 2, which is incorporated within the moving portion 25. Although the first portion 21 is fixed to the same position during the open and closed states, the second portion 22 of the actuation mechanism switches or translates between two different positions to switch the clamping valve 1 between the open and closed states, respectively. Therefore, the cross-sectional dimensions of the internal channel 11 of the tube 10 can be changed by using the actuation mechanism.

[0054] The lifespan of this clamping valve 1 depends primarily on the interaction between the tube 10 and the powder in the powder-gas mixture, and also primarily on the actuation cycle of the clamping valve 1, i.e., the number of transitions from the open to the closed state. Specifically, results show that closing and / or opening, i.e., the interaction or action on the tube 10, supports the formation of fractures in the inner portion 12 of the tube 10, which are caused by particles of the powder / gas mixture penetrating the inner portion 12 of the tube 10. In particular, the action on the tube 10 during operation generally supports the tendency for fractures and / or cracks induced by the interaction between the powder and the inner portion 12 of the tube 10 to grow or expand.

[0055] exist Figure 3 The diagram schematically illustrates a clamping valve 1 (upper part) and a tube 10 (lower part) for clamping the valve 1 according to a first exemplary embodiment of the invention. Contrary to the prior art, the tube 10 is configured such that it has a contraction section acting on the inner portion 12 of the tube 10 to establish contraction along at least a portion of an inner bend 13 of the tube 10, the inner bend 13 defining a cross-section of an internal channel 11 in a plane perpendicular to the delivery direction T. The compressive stress defines the contraction section, which causes the tube to tend to contract along the inner bend 13. Therefore, the tube 10 itself counteracts the formation of cracks or cuts, particularly the continuation of existing or formed cracks or cuts in the inner portion 12 of the tube 10. Specifically, the compressive stress required to establish the compressive stress is located in areas of the tube 10 positioned adjacent to or adjacent to the first portion 21 and the second portion 22 of the actuation mechanism, respectively. In other words, in the assembled state of the clamping valve 1, the first contraction section faces the first portion 21 and the second contraction section faces the second portion 22. Specifically, the contraction sections are formed in the sections of the tube 10 that contact the first portion 21 and / or the second portion 22 of the actuation mechanism of the clamping valve 1.

[0056] Specifically, the shape of the tube 10 is established at least in the non-compression state of the clamping valve 1. This contraction is achieved, for example, through the pre-forming of the tube 10. Therefore, the cross-section of the internal channel 11 measured in a plane perpendicular to the conveying direction T differs from a circular or perfectly circular cross-section, especially in the non-compression state. Figure 3In this embodiment, the cross-section of the internal channel 11 is elliptical. Preferably, the tube 10 is at least partially pre-formed, i.e., pre-formed in the portion connected to or located inside the actuation mechanism. The tube 10 outside the actuation mechanism or outside the connecting unit 32 may not be pre-formed. Furthermore, it may be configured that the radius of curvature changes along the inner side 12 of the tube 10 in the non-compression state. In particular, the radius of the inner bend 13 has a maximum value, for example, in the tube segment or region of the tube 10 positioned directly adjacent to the first portion 21 or the second portion 22 of the clamping valve 1 in the non-compression state. Preferably, the inner bend 13 has a curvature defined as the reciprocal of the radius of curvature (r) (1 / r). The curvature may be less than 1 1 / mm, more preferably less than 0.5 1 / mm, or most preferably less than 0.1 1 / mm, or even negative. In particular, the curvature is from 0 to 1 / mm. The inner bend 13 is distributed in the cross section perpendicular to the conveying direction T to the inner side 12 of the tube 10. Since these areas are the areas of greatest stress during operation, especially for tensile stress 10, the contraction avoids these tensile stresses, which would otherwise support the growth or continuation of cracks or fissures formed in the inner side 12 of the tube 10.

[0057] Preferably, the cross-section of the internal channel 11 in the non-actuated state has a geometry having a first axis D1 and a second axis D2. Therefore, the first axis D1 extends in a direction along which the distance between the first portion 21 and the second portion 22 of the actuation mechanism changes to transition the clamping valve 1 between a closed and open state. The second axis D2 is measured perpendicular to both the first axis D1 and the conveying direction T. Furthermore, it is preferably provided that the cross-section of the internal channel 11 in the non-pressurized state has a geometry in which the ratio of the first axis D1 to the second axis D2 has a value between 0.4 and 0.95, preferably between 0.5 and 0.8, and most preferably between 0.5 and 0.8.

[0058] For example, this preformed form with a shrinkage section is achieved by performing heat treatment during the deformation of the tube 10, which has a circular cross-section in its original state, i.e., before the heat treatment.

[0059] exist Figure 4The diagram schematically illustrates a tube 10 according to a second exemplary embodiment of the invention. Specifically, the inner portion 12 of the tube 10 is provided with at least one protrusion 15, which protrudes from the tube 10 within the inner channel 11 in a direction toward the center of the inner channel 11. Preferably, the tube 10 includes two protrusions 15 arranged opposite to each other in a direction perpendicular to the conveying direction T. In particular, at least one protrusion 15 is located in a tube segment adjacent to the first portion 21 and the second portion 22 of the actuation mechanism.

[0060] exist Figure 5 The diagram illustrates a pump assembly 60 including a pressing mechanism. Specifically, the pump assembly 60 is based on the peristaltic pump principle and has a tube 10 located between a pressing element 61, such as a moving roller, and a fixed wall 62. To move fluid or slurry located inside the tube 10, the pressing element 61 is pressed against the tube 10, causing the tube 10 to be compressed. Figure 5 In the illustrated embodiment, the extrusion elements 61 are movable rollers arranged at the ends of the support elements 63 of the rotating element 64. In the illustrated embodiment, the rotating element 64 has three support elements 63, each with a movable roller at its end. The support elements 63 are equidistant along a rotational direction in which they move during pumping. During rotation, the position of the extrusion tube 10 is moved to transfer fluid or slurry within the tube 10.

[0061] However, this type of pump assembly 60 implies significant extrusion deformation of the tube 10 to ensure the sealing of the encapsulated volume. This deformation results in fatigue degradation of the tube 10, which can lead to premature failure. Furthermore, this extrusion deformation generates internal stress within the tube 10, which increases with the wall thickness of the tube 10. Therefore, in cases where a thicker tube 10 is required to support higher head pressures at the outlet of the pump assembly 60, replacement of the tube 10 becomes necessary. In addition, the increased wall thickness of the tube 10 increases the extrusion force. Consequently, a higher counter-torque is required at the rotating element 64. All of these factors introduce some risk of drift or actuator stall and will result in less energy efficiency.

[0062] This has several disadvantages, such as the need for, for example, high-performance tubing 10 and the cost of replacing these tubing 10s. Furthermore, it is difficult to achieve a compact design due to the size of the multi-head pump and the necessity of a larger actuator. Additionally, energy efficiency is reduced, and maintenance work is increased for interchangeable tubing 10s or pumping mechanisms, such as the extrusion element 61 located on the fixed rotating element 63. Therefore, it is advantageous to use tubing 10, which at least partially has an oval cross-section to reduce the force exerted on it. Preferably, tubing 10 corresponds at least partially, particularly in the extruded section, to the tubing 10 of the present invention. Therefore, the torque or counter-torque required at the rotating element 64 can be reduced. Therefore, tubing 10 with thicker walls can be used particularly in applications where higher pressures are required at the outlet or output of the pump assembly 61.

[0063] In particular, the oval shape of tube 10 further reduces the internal pressure of tube 10 due to the reduced strain during compression. Therefore, fatigue behavior is significantly improved. Specifically, tube 10 can withstand higher head pressures because a thicker tube wall can be selected.

[0064] Figure 6 The diagram illustrates the process of forming a supply. Figure 5 The mold / fixture for the pipe 10 used in the pump device 60.

[0065] In order to generate a combination Figure 4The specific route and shape of the tube 10 in the pump assembly 61 are preferably configured such that the tube 10, initially having a circular cross-section, is arranged inside a specific mold 70 and / or fixture having a forming base 72 and preferably a forming cap 71 with a tube groove. Specifically, the tube 10 is arranged inside the forming base 72 such that the overall route of the tube 10 corresponds to the overall route of the tube 10 when it is assembled in the pump assembly 61. Additionally, the tube 10 is deformed such that at least a portion of the circular cross-section is deformed into an oval cross-section. To generate the required internal stress and maintain the shape established by the mold 70 or fixture, it is preferably configured such that the tube 10 within the mold or fixture is subjected to a heating medium, such as hot water, for several minutes. Subsequently, the tube 10 is cooled using a cooling medium, such as cold water. Thus, after the tube 10 is removed from the mold 70 / fixture, the deformed cross-section is retained. While such deformation of the tube 10 can be achieved in a planar design, it is advantageous to produce an overall route for the tube 10 that conforms to its path during the assembly phase of the pump assembly 30, as there is at least some risk of tube kinking, which could impair pump function and / or induce tube 10 adhesion. Therefore, it is beneficial to use a mold 70 / fixture that substantially corresponds to the inner wall of the pump assembly 60, determining the positioning or arrangement of the tube 10 within the mold 70 / fixture.

[0066] Figure Labels

[0067] 1 clamping valve

[0068] 10 tubes

[0069] 11 internal passages

[0070] 12 Inner side

[0071] 13 Inner Curve

[0072] 15 protrusions

[0073] 18 handheld items

[0074] 20 fixed units

[0075] 21 Part 1

[0076] 22 Part Two

[0077] 24 spring elements

[0078] 25 moving parts

[0079] 30 Powder Chamber

[0080] 31 sleeves

[0081] 32 connection units

[0082] 33 casing

[0083] 40 handheld items

[0084] 41 First Input Channel

[0085] 42 Second Input Channel

[0086] 50 joints

[0087] 60 pump unit

[0088] 61 Extrusion Components

[0089] 62 walls

[0090] 63 pillar components

[0091] 64 rotating elements

[0092] 70 mold

[0093] 71 covers

[0094] 72 basic body

[0095] 100 Powder Gas Injection Device

[0096] T conveying direction

[0097] D1 First Axis

[0098] D2 Second Axis

Claims

1. A tube (10) for a clamping valve (1), the tube (10) being incorporated into a powder gas injection device (100), the tube (10) having an internal channel (11) for conveying a medium under pressure along a conveying direction (T) in an operating mode, the tube (10) having an inner bend (13) that defines the circumference of the internal channel (11) in a cross-section of the tube (10) along a plane perpendicular to the internal channel (11), the shape of the tube (10) being configured such that the inner bend (13) at least presents a constricted section, the constricted section being subjected to a deformation force in the operating mode that tends to contact the constricted section (13). in, The inner curved portion (13) includes two constricted segments that are opposite each other in diameter. In order to form the contraction section, the thickness and / or radius of curvature of the tube (10) distributed to the inner bend (13) varies along the circumferential direction. The inner curved portion (13) is characterized by having a protrusion (15) facing the center of the tube (10).

2. The tube (10) according to claim 1, wherein, The cross-section of the internal channel (11) is non-circular in the non-compression state.

3. The tube (10) according to claim 2, wherein, The cross-section of the internal channel (11) is elliptical in the non-compression state.

4. The tube (10) according to claim 2, wherein, The cross-section of the internal channel (11) has a first axis (D1) and a second axis (D2), the second axis (D2) being non-parallel to the first axis (D1), wherein the ratio of the first axis (D1) to the second axis (D2) has a value between 0.1 and 0.

95.

5. The tube (10) according to claim 4, wherein, The ratio of the first axis (D1) to the second axis (D2) has a value between 0.2 and 0.

8.

6. The tube (10) according to claim 5, wherein, The ratio of the first axis (D1) to the second axis (D2) has a value between 0.55 and 0.

8.

7. The tube (10) according to any one of claims 1 to 6, wherein, The cross-section of the internal channel (11) in a plane perpendicular to the transport direction (T) roughly corresponds to the Cassini oval shape.

8. The tube (10) according to any one of claims 1 to 6, wherein, The tube (10) is preformed to provide the contraction section.

9. The tube (10) according to any one of claims 1 to 6, wherein, The radius of curvature changes along the inner bend (13), wherein the curvature of the inner bend (13) is defined as the reciprocal of the radius of curvature and is less than 1 1 / mm.

10. The tube (10) according to claim 9, wherein, The curvature of the inner curved portion (13) is less than 0.5 1 / mm.

11. The tube (10) according to claim 10, wherein, The curvature of the inner curved portion (13) is less than 0.1 1 / mm.

12. The tube (10) according to claim 11, wherein, The curvature of the inner curved portion (13) has a negative value.

13. The tube (10) according to any one of claims 1 to 6, wherein, The inner side (12) of the tube (10) is at least partially coated.

14. A clamping valve (1) having a pipe (10) according to any one of claims 1 to 13, the clamping valve (1) having an actuation mechanism, wherein, The actuation mechanism includes a first portion (21) and a second portion (22) arranged opposite to each other, wherein the actuation mechanism is configured to change the distance between the first portion (21) and the second portion (22) to open or close the internal channel (11), the tube (10) being located between the first portion (21) and the second portion (22), wherein a first constricted section of the tube is positioned adjacent to the first portion (21) and a second constricted section of the tube is positioned adjacent to the second portion (22).

15. A method for producing the tube (10) according to any one of claims 1 to 13, wherein, The tube is placed in a mold or fixture for changing the cross-section of the tube and / or for changing the internal stress of the tube.

16. The method of claim 15, comprising: - Heat the tube to a temperature between 40°C and 500°C for 0 to 30 minutes, and / or - Cool the tube to a temperature between 1°C and 50°C.

17. The method according to claim 16, wherein, The tube is heated to a temperature between 60°C and 200°C.

18. The method according to claim 17, wherein, The tube is heated to a temperature between 80°C and 100°C.

19. The method of claim 16, wherein, The heating process takes 1 to 20 minutes.

20. The method according to claim 19, wherein, The heating process requires 1 to 10 minutes.

21. The method according to claim 16, wherein, The tube is cooled to a temperature between 5°C and 50°C.

22. The method according to claim 21, wherein, The tube is cooled to a temperature between 15°C and 25°C.

23. A pump device (60) comprising a squeezing mechanism and a tube (10) according to any one of claims 1 to 13.

24. The pump device (60) according to claim 23, wherein, The pump device (60) is a peristaltic pump.

25. The pump device (60) according to claim 23 or 24, wherein, The pump device (60) is integrated into the powder gas injection device (100).

26. A powder gas injection device (100) comprising a clamping valve (1) according to claim 14.

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