Conduit ball head lossless switching device and switching method

Abstract

The invention belongs to the technical field of conduit connection, and particularly relates to a conduit ball head lossless switching device and a switching method.The conduit ball head lossless switching device comprises an adapter and a cushion block, the adapter is made of a metal material, the cushion block is made of a fluoroplastic material, and the adapter and the cushion block are formed through machining and assembled into a whole; the adapter is provided with a connecting structure matched with a guide pipe outer sleeve nut and a groove used for installing the cushion block, sealing thorns are arranged in the groove, the cushion block is provided with an exhaust hole, and the sealing end, making contact with a guide pipe ball head, of the cushion block is made of fluoroplastic materials. The switching method comprises an assembly step and a disassembly step, the conduit ball head and the metal adapter are isolated through the cushion block, and lossless connection and convenient disassembly and assembly are achieved. The device is simple in structure, high in universality, capable of avoiding damage to the sealing face of the conduit ball head and improving the assembling quality, and suitable for testing scenes such as airtight tests of various conduits.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of catheter connection, and particularly relates to a catheter ball head nondestructive switching device and a switching method. BACKGROUND

[0002] Catheters are widely used in the field of liquid propulsion and the like, and in order to ensure the safety and reliability of use, the catheters usually need to be subjected to strength tests such as air tightness tests. Traditional catheter ball head switching tooling is usually made of metal materials such as brass or stainless steel. Since the metal material has high hardness, and the sealing surface of the catheter ball head has high precision requirements, in the process of connecting the switching tooling and the catheter ball head, direct contact between the two can easily cause scratches, resulting in damage to the sealing surface of the catheter ball head, and thus affecting the sealing effect and test accuracy.

[0003] The related switching technology disclosed in patent CN109428215A has certain improvement in structural connection stability, but it does not specially design for the nondestructive protection of the sealing surface of the catheter ball head, and there is still a risk of direct contact between the metal components in the switching structure and the sealing surface of the ball head, which is difficult to avoid scratch damage in the process of assembly and testing. At the same time, the switching device of the prior art has poor universality, is difficult to adapt to catheters of different specifications, and has complicated disassembly and assembly operations, and cannot meet the test efficiency and sealing surface protection requirements.

[0004] In the prior art, since the catheter and the switching tooling need to form a linear seal, contact is unavoidable. How to avoid damage to the sealing surface of the catheter ball head while ensuring that the overall strength of the device meets the requirements of the air tightness test, and at the same time realize the lightness and easy operation of the device and the universality, has become a technical problem to be solved in the field. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a catheter ball head nondestructive switching device and a switching method, which can not only ensure the structural strength of the switching device to meet the test requirements, but also avoid damage to the sealing surface of the catheter ball head, and at the same time has the characteristics of simple structure, strong universality and convenient disassembly and assembly.

[0006] According to the catheter ball head nondestructive switching device provided by the present application, the switching head and the pad can be assembled into an integrated structure, and the integrated structure can be used in cooperation with the catheter. The switching head is provided with a switching head groove and an external thread structure, the switching head groove is used for installing the pad, and a deformation gap is reserved between the length direction of the switching head groove and the pad. One end of the pad is provided with an arc-shaped sealing end adapted to the catheter ball head, and the other end of the pad is provided with an exhaust hole. The catheter comprises a sleeve nut, a ball head and a pipe, the sleeve nut is provided with an internal thread adapted to the external thread of the switching head, and the ball head can be tightly attached to the arc-shaped sealing end of the pad to form a seal.

[0007] Furthermore, the metal material of the adapter is brass or stainless steel, and the adapter also includes an adapter body, an adapter vent hole, a sealing spike, and two outer ends of the adapter. The external thread is provided at the two outer ends of the adapter for threaded connection with the outer nut of the conduit.

[0008] Furthermore, the inner diameter of the adapter groove is larger than the diameter of the pad, and a deformation gap is reserved between the adapter groove and the pad in the length direction, so that the pad can deform after being squeezed to fill the gap and achieve a seal.

[0009] Furthermore, the sealing spike is located on the inner end face of the adapter groove. The sealing spike has an annular groove structure that can be embedded into the end face of the pad to increase the sealing contact area and form a double sealing structure.

[0010] Furthermore, the fluoroplastic material of the pad is polytetrafluoroethylene, and the inner diameter of the vent hole of the pad is smaller than the inner diameter of the vent hole of the adapter. The vent hole can both allow gas to flow and balance the air pressure, and facilitate the pad to be pushed by a rod during disassembly.

[0011] Furthermore, the inner diameter of the outer nut of the conduit is adapted to the outer diameter of the tube, the tube is a hollow cylindrical structure, the ball head is a hemispherical protrusion structure and is integrally formed at the end of the tube, and the axis of the tube coincides with the axis of the ball head and the outer nut.

[0012] Furthermore, the sealing spike is a circular ring, and the sealing spike is arranged along the circumferential direction of the inner end face of the adapter groove.

[0013] The present invention also provides a method for connecting a non-destructive adapter for a catheter bulb tip, comprising the following steps: Step S1: Place the pad smoothly into the adapter groove of the adapter, ensuring that the pad and the sealing spikes in the adapter groove are in full contact without any misalignment, thus completing the integrated assembly of the adapter and the pad. Step S2: Align the integrated adapter with the conduit, align the external threads of the two outer ends of the adapter with the internal threads of the conduit outer sleeve nut, and tighten the outer sleeve nut until the gasket sealing end and the conduit ball head are tightly fitted and there is no relative slippage. Step S3: After the airtightness test is completed, loosen the outer nut of the conduit in a counterclockwise direction and unscrew it completely from both ends of the adapter to separate the conduit from the adapter. Take out the conduit for subsequent testing. Step S4: Select a cylindrical rod with a diameter smaller than the vent hole of the pad, insert the rod into the vent hole of the adapter body, and push the end face of the pad smoothly along the axial direction to make the pad come out of the groove of the adapter, thus completing the separation of the adapter and the pad and the overall disassembly.

[0014] Furthermore, in step S2, the pad deforms along the length of the adapter groove under the squeezing action, and the deformation gap is completely filled. At the same time, the sealing thorn is embedded in the end face of the pad to form a double sealing structure. The adapter vent and the pad vent simultaneously discharge the gas trapped during the assembly process, balance the internal and external air pressure, ensure that there is no bubble leakage on the sealing surface, and that there are no scratches or damage on the sealing surface of the guide tube ball head.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses a polytetrafluoroethylene pad to flexibly contact the tube ball head, avoiding direct metal-to-metal friction, completely eliminating scratches and damage to the sealing surface, ensuring the sealing performance and testing accuracy of the tube, and solving the core pain point of easy damage to the sealing surface in the prior art.

[0016] 2. The adapter sealing burr and the gasket deformation filling gap of the present invention form a double seal, which, together with the exhaust hole, balances the air pressure and ensures that there is no air bubble leakage during the airtightness test. The sealing effect is better than the traditional single sealing structure and meets the sealing requirements of high strength test.

[0017] 3. The adapter of this invention can be processed to fit the specifications of the conduit and is compatible with conduits of different diameters; during disassembly, it can be separated by pushing the vent hole of the pad with a rod-shaped object, which is easy to operate and takes into account both versatility and testing efficiency.

[0018] 4. The adapter of this invention is made of brass or stainless steel to ensure the overall structural strength. The pad is made of wear-resistant and corrosion-resistant fluoroplastic to balance strength requirements and durability, extend the service life of the device and reduce testing costs. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the adapter structure of the present invention; Figure 2 This is a schematic diagram of the structure of the pad block of the present invention; Figure 3 This is an axial sectional view of the adapter of the present invention; Figure 4 This is an axial sectional view of the pad block of the present invention; Figure 5 This is a schematic diagram of the internal structure of the catheter of the present invention; Figure 6 This is a fully assembled sectional view of the non-destructive adapter for the catheter ball head of the present invention.

[0020] The following are the labeling elements in the figure: 1. Adapter; 2. Gasket; 3. Conduit; 101. Adapter body; 102. Adapter vent; 103. Sealing spike; 104. Adapter groove; 105. Two outer ends of the adapter; 201. Vent hole; 202. Sealing end of gasket; 301. Outer nut; 302. Ball head; 303. Pipe. Detailed Implementation

[0021] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0022] like Figures 1-6 As shown, the present invention discloses a non-destructive adapter for a conduit ball head, including an adapter 1 and a pad 2. The adapter 1 and the pad 2 can be assembled into an integral structure, and the integral structure formed by the adapter 1 and the pad 2 can be used in conjunction with a conduit 3. One end of the conduit 3 is provided with a ball head 302 and an outer nut 301, and the other end of the conduit 3 is a tube 303.

[0023] The adapter 1 is made of brass or stainless steel and is formed by machining to ensure that the structural strength meets the requirements of airtightness test and other tests. The adapter 1 can be adapted to the inner diameter of the outer nut 301 of the conduit, and can be adapted to conduits 3 of different diameters, which greatly improves the versatility of the device. The adapter 1 includes an adapter body 101, an adapter vent hole 102, a sealing spike 103, an adapter groove 104, and two outer ends 105 of the adapter.

[0024] The two outer ends 105 of the adapter are provided with external threads, which are used to achieve threaded connection with the outer nut 301 of the conduit 3. The groove 104 of the adapter is used to install the pad 2. The inner diameter of the groove 104 is larger than the diameter of the pad 2, and a deformation gap is reserved between the length direction of the groove 104 and the pad 2 to ensure that the pad 2 can generate effective deformation after being tightened and squeezed, thereby achieving a reliable seal. The sealing spike 103 is provided on the inner end face of the groove 104 of the adapter. The sealing spike 103 can increase the sealing area between the adapter 1 and the pad 2 and improve the overall sealing effect.

[0025] The pad 2 is made of polytetrafluoroethylene fluoroplastic material and is formed by mechanical processing. Fluoroplastic material has moderate hardness, wear resistance and corrosion resistance, which can avoid damage when it comes into contact with the conduit ball head 302. The pad 2 includes a vent hole 201 and a pad sealing end 202.

[0026] The inner diameter of the vent 201 is smaller than the inner diameter of the vent 102 of the adapter. The vent 201 facilitates gas flow and also facilitates the pushing of the pad 2 by a rod during disassembly. The sealing end 202 of the pad is an arc-shaped surface that matches the ball head 302 of the conduit 3, ensuring that the two fit tightly to form an effective seal.

[0027] The conduit 3 is machined into an integrated structure to ensure that the components are firmly connected without assembly gaps, and to meet the pressure bearing requirements during fluid transmission and testing. The conduit 3 includes an outer nut 301, a ball head 302, and a tube 303.

[0028] The inner diameter of the outer nut 301 is adapted to the outer diameter of the tube 303 to ensure smooth sliding without excessive clearance; the length of the outer nut 301 is designed according to actual assembly requirements; the ball head 302 is integrally formed at the end of the tube 303, and the ball head 302 is a hemispherical protrusion structure; the tube 303 is a hollow cylindrical structure, which is the core channel for fluid transmission, and the axis of the tube 303 coincides with the axis of the ball head 302 and the outer nut 301.

[0029] The specific steps for the connection method based on the above-mentioned non-destructive adapter for catheter bulb tips are as follows: Step S1: Place the pad 2 smoothly into the adapter groove 104 of the adapter 1, ensuring that the pad 2 and the sealing spike 103 in the adapter groove 104 make good contact, so that the adapter 1 and the pad 2 are assembled as one unit.

[0030] Step S2: Align the assembled adapter with the conduit 3, aligning the external threads of the two outer ends 105 of the adapter with the internal threads of the outer sleeve nut 301 of the conduit. Slowly tighten the outer sleeve nut 301 until the gasket sealing end 202 is in close contact with the conduit ball head 302. At this time, the gasket 2 deforms along the length of the adapter groove 104 under the pressure, and the deformation gap is filled. At the same time, the sealing spike 103 is embedded in both ends of the gasket, forming a double sealing structure. The adapter vent 102 and the gasket vent 201 are used to balance the air pressure generated during the assembly process to prevent the air pressure from affecting the sealing effect.

[0031] Step S3: After the test is completed, loosen the outer nut 301 of the conduit counterclockwise and completely unscrew it from the two outer ends 105 of the adapter to separate the conduit 3 from the adapter. At this time, the conduit 3 can be taken out for subsequent testing or processing.

[0032] Step S4: Select a rod with a diameter smaller than the inner diameter of the vent hole 201 of the pad, insert the rod into the vent hole 102 of the adapter body 101, and push the end face of the pad 2 to make the pad 2 come out of the adapter groove 104, thus completing the separation of the adapter 1 and the pad 2 and completing the overall disassembly; during the disassembly process, the rod applies force through the vent hole 201 of the pad to avoid damaging the sealing end 202 of the pad and the sealing spike 103 of the adapter groove 104.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A non-destructive adapter for a catheter ball head, characterized in that, It includes an adapter (1) and a pad (2) that can be assembled into a single structure, which can be used in conjunction with a conduit (3); The adapter (1) is provided with an adapter groove (104) and an external thread structure. The adapter groove (104) is used to install the pad (2), and a deformation gap is reserved between the length direction of the adapter groove (104) and the pad (2). The pad (2) has an arc-shaped sealing end (202) at one end that is adapted to the guide tube ball head (302), and an exhaust hole (201) at the other end. The conduit (3) includes an outer nut (301), a ball head (302) and a tube (303). The outer nut (301) has an inner thread that is compatible with the external thread of the adapter (1). The ball head (302) can fit tightly with the arc-shaped sealing end (202) of the pad (2) to form a seal.

2. The non-destructive adapter for the catheter ball head according to claim 1, characterized in that, The metal material of the adapter (1) is brass or stainless steel. The adapter (1) also includes an adapter body (101), an adapter vent hole (102), a sealing spike (103) and two outer ends (105) of the adapter. The external thread is provided on the two outer ends (105) of the adapter and is used to achieve threaded connection with the outer nut (301) of the conduit (3).

3. The non-destructive adapter for the catheter ball head according to claim 2, characterized in that, The inner diameter of the adapter groove (104) is larger than the diameter of the pad (2). A deformation gap is reserved between the length direction of the adapter groove (104) and the pad (2) for the pad (2) to deform after being squeezed to fill the gap and achieve sealing.

4. The non-destructive adapter for the catheter ball head according to claim 2, characterized in that, The sealing spike (103) is located on the inner end face of the adapter groove (104). The sealing spike (103) is an annular groove that can be embedded into the end face of the pad (2) to increase the sealing contact area and form a double sealing structure.

5. The non-destructive adapter for the catheter ball head according to claim 1, characterized in that, The fluoroplastic material of the pad (2) is polytetrafluoroethylene. The inner diameter of the vent hole (201) of the pad (2) is smaller than the inner diameter of the vent hole (102) of the adapter. The vent hole (201) can both allow gas flow to balance the air pressure and facilitate the pad (2) to be pushed by a rod during disassembly.

6. The non-destructive adapter for the catheter ball head according to claim 1, characterized in that, The inner diameter of the outer nut (301) of the conduit (3) is adapted to the outer diameter of the tube (303). The tube (303) is a hollow cylindrical structure. The ball head (302) is a hemispherical protrusion structure and is integrally formed at the end of the tube (303). The axis of the tube (303) coincides with the axis of the ball head (302) and the outer nut (301).

7. The non-destructive adapter for the catheter ball head according to claim 4, characterized in that, The sealing spike (103) is a circular ring, and the sealing spike (103) is arranged along the circumferential direction of the inner end face of the adapter groove (104).

8. A method for connecting a catheter ball head using a non-destructive adapter as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Place the pad (2) smoothly into the adapter groove (104) of the adapter (1), ensuring that the pad (2) is in full contact with the sealing spike (103) in the adapter groove (104) without any offset, and complete the integrated assembly of the adapter (1) and the pad (2). Step S2: Align the integrated adapter with the conduit (3), align the external threads of the two outer ends (105) of the adapter with the internal threads of the outer sleeve nut (301) of the conduit, and tighten the outer sleeve nut (301) until the gasket sealing end (202) and the conduit ball head (302) are tightly fitted and there is no relative slippage. Step S3: After the airtightness test is completed, loosen the outer nut (301) of the conduit in a counterclockwise direction and unscrew it completely from both outer ends (105) of the adapter to separate the conduit (3) from the adapter and remove the conduit (3) for subsequent testing. Step S4: Select a cylindrical rod with a diameter smaller than the vent hole (201) of the pad, insert the rod into the vent hole (102) of the adapter body (101) and push the end face of the pad (2) smoothly along the axial direction so that the pad (2) comes out of the adapter groove (104) and completes the separation of the adapter (1) and the pad (2) and the overall disassembly.

9. The switching method according to claim 8, characterized in that, In step S2, the pad (2) deforms along the length of the adapter groove (104) under the squeezing action, and the deformation gap is completely filled. At the same time, the sealing spike (103) is embedded in the end face of the pad (2) to form a double sealing structure. The adapter exhaust hole (102) and the pad exhaust hole (201) simultaneously discharge the gas trapped during the assembly process, balance the internal and external air pressure, ensure that there is no bubble leakage on the sealing surface, and that there are no scratches or damage on the sealing surface of the guide tube ball head (302).

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