High-pressure-resistant integrated joint

Abstract

The utility model provides a high pressure resistant integrated joint which is used for fixing a capillary tube in a connector and comprises a first screw, the first screw is provided with a capillary tube through hole for the capillary tube to penetrate through, a screw rod of the first screw is in threaded connection with the connector, a first conical head is arranged at the end of the screw rod of the first screw, and a second conical head is arranged at the end of the first conical head. The screw rod of the first screw is provided with a kerf in the axial direction, the screw rod of the second screw is evenly divided into two parts by the kerf, multi-stage fastening of the capillary tube can be achieved through the first screw, the high pressure resistance of the connector is enhanced, meanwhile, the stress point position of the capillary tube is dispersed, and the stress concentration phenomenon of the capillary tube is relieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high efficiency liquid chromatography system joint technical field especially relates to a high pressure -resisting integrated joint. BACKGROUND

[0002] In liquid chromatography analysis system, the detection of different target compounds needs to match the corresponding chemical detection method, and its flow path system generally involves multi-stage high pressure pipeline connection, including pump system to perfusion switching valve, perfusion switching valve to high pressure sampling valve and the flow path switching between each high pressure valve body. Especially in clinical chromatography and mass spectrometry therapeutic drug monitoring (TDM) system, although the high pressure pipeline and joint of traditional 316L stainless steel material have excellent mechanical strength (pressure value can reach 70-100MPa), but there is a risk of Fe ion dissolution under high pressure operation environment, which makes it not suitable for clinical detection scene. Although the elastic capillary tube made of PEEK (polyether ether ketone) high polymer material can effectively avoid the problem of metal ion pollution, but due to the strength of PEEK material, the existing joint will cause local ring extrusion PEEK capillary tube, which will cause stress concentration, and the capillary tube will be deformed and even blocked, and the capillary tube will be exploded or the capillary tube will be reversed.

[0003] Such as patent number "CN219417359U" discloses a liquid chromatograph hand screw joint, including pipeline and threaded sleeve on the pipeline threaded joint part, one end of the threaded joint part is provided with the blade ring sleeved on the pipeline, the threaded joint part away from the blade ring one end is provided with hand screw joint part, the hand screw joint part is movably sleeved on the pipeline, the clamping groove of the hand screw joint part is clamped in the lug of the threaded joint part, by screwing the hand screw joint part, so that the threaded joint part extrudes the blade ring, so that the blade ring and the pipeline are tightly matched and fastened on the pipeline, and the two joint parts are matched to extrude the blade ring when screwing; but the above scheme only extrudes the blade ring to tightly seal the capillary tube, which can easily cause the capillary tube to be deformed and even blocked due to stress concentration. UTILITY MODEL CONTENTS

[0004] In view of the defects of the prior art, the utility model aims at solving the problem that the existing joint structure for fastening the capillary tube made of PEEK material can easily cause the capillary tube to be deformed and even blocked.

[0005] The technical scheme of the utility model is: a high pressure -resisting integrated joint is used for fixing the capillary tube in the interface, characterized by comprising a first screw, the first screw is provided with a capillary tube through hole for the capillary tube to pass through, the screw rod of the first screw is screwed with the interface, the screw rod end of the first screw is provided with a first conical head, and at least one slit is arranged on the screw rod of the first screw in the axial direction.

[0006] Preferably, the screw rod of the first screw is symmetrically provided with two slits along the axial direction, and the screw rod of the second screw is uniformly divided into two parts by the slits.

[0007] Preferably, the first screw is further provided with a connecting screw hole at the head portion, the bottom of the connecting screw hole is tapered, and the second screw is provided with a second tapered head at the end of the screw rod.

[0008] Preferably, the head portion of the first screw and the second screw is selected from any one of knurled shape, external hexagonal shape and petal shape.

[0009] Preferably, the first screw, the second screw and the capillary tube are made of high-molecular soft material or metal material.

[0010] Preferably, the first screw, the second screw and the capillary tube are made of PEEK material, stainless steel, titanium (Ti), stainless steel coated PEEK (inner layer PEEK and outer layer stainless steel), PEEK coated fused quartz or polytetrafluoroethylene (PTFE) material.

[0011] Compared with the prior art, the advantages of the utility model are:

[0012] In the high-pressure-resistant integrated connector, the first screw is screwed in to make the first tapered head and the interface be pressed against each other, so that the first tapered head deforms and shrinks the capillary tube hole, thereby realizing the sealing and the first-stage fastening of the capillary tube.

[0013] In the high-pressure-resistant integrated connector, the tapered end of the second screw gradually presses against the tapered hole of the tail portion of the first screw to deform during the process of being screwed into the tail hole of the first screw, thereby shrinking the capillary tube and forming the third-stage fastening, and further enhancing the fastening of the connector to the capillary tube.

[0014] The high-pressure-resistant integrated connector divides the fastening of the capillary tube into multiple stages by the first screw and the second screw, thereby dispersing the stress points of the capillary tube, eliminating the stress concentration phenomenon of the capillary tube, and greatly reducing the force borne by each stress point of the capillary tube, so that the capillary tube is prevented from being deformed and blocked due to stress concentration.

[0015] The capillary tube and the second screw are standard components, which are low in cost and high in economic benefit.

[0016] The detailed structure of the present application is further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is an overall appearance schematic view of the present application embodiment 1.

[0018] Fig. 2 It is an explosion schematic view of the present application embodiment 1.

[0019] Fig. 3 It is a sectional view of the present application embodiment 1.

[0020] Fig. 4 It is an overall appearance schematic view of the present application embodiment 2.

[0021] Fig. 5 It is an explosion schematic view of the present application embodiment 2.

[0022] Fig. 6 It is a sectional view of the present application embodiment 2.

[0023] Wherein, 1, first screw; 11, first conical head; 12, cutting seam; 13, connecting screw hole; 2, capillary tube; 21, capillary tube through hole; 3, second screw; 31, second conical head. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application embodiments clearer, the technical scheme in the present application embodiments will be described clearly and completely below in combination with the drawings in the present application embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. EMBODIMENT

[0025] As Figs. 1-3As shown in the utility model provides a kind of high-pressure-resistant integrated joint, for fixing capillary 2 in interface, including first screw 1, the first screw 1 is equipped with the capillary through hole 21 for capillary 2, the screw rod of the first screw 1 is screwed with interface, the screw rod end of the first screw 1 is equipped with first tapered head 11, the screw rod of the first screw 1 is equipped with slit 12 along the axial direction, the screw rod of the second screw 3 is evenly divided into two parts by slit 12.When the first screw 12 is screwed into interface, the first tapered head 1121 of the first screw 12 will be extruded with the inner taper surface of interface, causing the first tapered head 11 to be deformed, the capillary through hole 21 on the first screw 1 is contracted and holds tightly capillary 2, forming first level fastening;At the same time, when the first screw 1 extrudes the interface, the inner taper surface of the interface will extrude the first tapered head 11 of the first screw 1 reversely, so that the first screw 1 with slit 12 is extruded and deformed, the screw rod part of the first screw 1 will gradually bend towards the axial direction, the capillary through hole 21 reduces and clamps the outer diameter of capillary 2, realizes second level fastening reinforcement, and further improves the pressure rating.

[0026] The utility model distributes the point of fastening capillary 2 at each place of capillary 2, not only disperses the stress point of capillary 2, alleviates the stress concentration phenomenon of capillary 2, and the dispersed stress point also makes the force borne by single stress point of capillary 2 greatly reduce, avoids that capillary 2 occurs serious deformation and blockage due to stress concentration.

[0027] Specifically, the head profile of the first screw 1 and the second screw 3 is selected from any one of knurling shape, outer hexagonal shape and petal shape; it is convenient for operators to operate the first screw 1 and the second screw 3 into and out.

[0028] Specifically, the material of the first screw 1, the second screw 3 and the capillary 2 is selected from any one of high molecular soft material and metal. In the embodiment, the materials of the first screw 1, the second screw 3 and the capillary 2 are all PEEK (polyether ether ketone). Embodiment

[0029] As Figs. 4-6 shown, on the basis of embodiment 1, further including second screw 3, the head of the first screw 1 is equipped with the connecting screw hole 13 connected with the second screw 3, the hole bottom of the connecting screw hole 13 is conical, the screw rod end of the second screw 3 is equipped with the second tapered head 31 matched with the connecting screw hole 13. The utility model passes through the second screw 3 when being screwed into the connecting screw hole 13 of the first screw 1, the second tapered head 31 of the second screw 3 is extruded and deformed with the connecting screw hole 13, so that the capillary through hole 21 is contracted and holds tightly capillary 2, realizes third level fastening.

[0030] Working process and principle:

[0031] The first taper head 11 is extruded with the interface under the thrust of the first screw 1, and the first taper head 11 is deformed, so that the capillary through hole 21 at the first taper head is contracted to tightly hold the outer diameter of the capillary 2 to realize the sealing performance and the first level of fastening; meanwhile, the screw rod of the first screw 1 is provided with a slit 12, and the counterforce of the interface to the first taper head 11 in the process of screwing the first screw 1 makes the screw rod of the first screw 1 be extruded and deformed, and the capillary 2 on the first screw 1 is contracted to tightly hold the outer diameter of the capillary 2, so that the second level of fastening is realized.

[0032] The utility model further has the second screw 3, and the second screw 3 is screwed into the connecting screw hole 13 of the first screw 1, the outer taper surface of the first taper head 11 is extruded with the connecting screw hole 13, the capillary through hole 21 at the first taper head 11 is deformed and contracted to tightly hold the outer diameter of the capillary 2, so that the third level of fastening is realized.

[0033] Pipe diameter: 0.02in

[0034] Test instrument: Waters QDA

[0035] Chromatographic pump: ACQUITY UPLC H-Class four-element solvent manager QSM

[0036] Chromatographic column: MSCB 3.0*100*2.5um

[0037] Flow rate: 0.75ml / min

[0038] Test pressure: 80MPA / 11603 psi, the connecting joint of example 2 is used for testing.

[0039] Material: all PEEK materials,

[0040] Through testing, the joint device of the utility model can bear the pressure of 50MPa within 30min.

[0041] The above is the specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field can make equivalent replacement or change according to the technical scheme and the conception of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model claim.

Claims

1. A high-pressure resistant one-piece fitting for fixing a capillary tube (2) in a port, characterized in that, The first screw (1) is provided with a capillary tube through hole (21) for the capillary tube (2) to pass through, the screw rod of the first screw (1) is screwed with the interface, the screw rod end of the first screw (1) is provided with a first tapered head (11), and at least one slit (12) is arranged on the screw rod of the first screw (1) in the axial direction.

2. A high pressure resistant integral fitting according to claim 1, characterized in that The screw rod of the first screw (1) is provided with two symmetrical slits (12) in the axial direction.

3. A high pressure resistant integral fitting according to claim 1, wherein The second screw (3) is further included, the head of the first screw (1) is provided with a connecting screw hole (13) connected with the second screw (3), the hole bottom of the connecting screw hole (13) is tapered, the screw rod end of the second screw (3) is provided with a second tapered head (31) matched with the connecting screw hole (13).

4. A high pressure resistant one-piece fitting according to any one of claims 1-3, characterized in that The head contour of the first screw (1) and the second screw (3) is selected from any one of knurling shape, outer hexagonal shape and petal shape.

5. A high pressure resistant integral fitting according to claim 4, wherein The first screw (1), the second screw (3) and the capillary tube (2) are products prepared from high polymer soft material or metal material.

6. A high pressure resistant one-piece fitting according to claim 5, wherein, The first screw (1), the second screw (3) and the capillary tube (2) are products prepared from any one of PEEK material, stainless steel, titanium, stainless steel coated PEEK, PEEK coated fused quartz and polytetrafluoroethylene PTFE material.

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