Hand screwing type flow path connecting device

Abstract

The utility model provides a hand screwing type flow path connecting device, and relates to the technical field of pipeline connecting devices, the hand screwing type flow path connecting device comprises a first-stage connecting screw, the outer wall of the first-stage connecting screw is provided with a first-stage external thread connected with external adaptive equipment, and a capillary tube is provided with a check block; the end face of the capillary tube abuts against the inner wall of the matching part by adjusting the screwing length of the two-stage screw and adjusting the distance of the capillary tube extending out of the sealing head, zero-clearance fit between the capillary tube and the matching part is achieved, and meanwhile the capillary tube and the connecting device are fixed. According to the connecting device, a pipeline in external adaptive equipment can be rapidly connected, other tools are not needed, the secondary screw and the capillary tube are matched to lock the connecting position, the capillary tube is sleeved with the sealing head, the dead volume is reduced, and meanwhile high-pressure sealing is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline connection devices, and in particular to a hand-tightening flow path connection device. Background Art

[0002] During the liquid chromatography experiment, it is necessary to connect the capillary and the chromatographic column through a connector. Liquid or gas is transported between the components of the relevant equipment through suitable connecting pipes. The connecting pipes formed by it have appropriate connection systems (also called connecting devices) at both ends so that they can establish a sealed connection with the connectors of the components.

[0003] The existing capillary connecting device is difficult to quickly fix the capillary, and other tools are usually needed for connection, which makes the connecting device inconvenient to use and has poor sealing after connection, making it difficult to meet the use requirements of certain high-pressure environments. Utility Model Content

[0004] The embodiment of the present application provides a hand-tightened flow path connection device, wherein the outer wall of the first-level connecting screw is provided with a first-level external thread, and the first-level external thread is connected to the external adapter device, and the first-level connecting screw is screwed with the second-level connecting screw, so that the stopper abuts against the clamping groove, and the screwing length of the two-level screw is adjusted to adjust the distance that the capillary extends out of the sealing head, so that the front end face of the capillary abuts against the end face of the bottom of the inner hole of the matching piece, so as to achieve zero-gap matching between the capillary and the matching piece, and at the same time, the capillary is fixed to the connection device; a sealing head made of flexible material is provided at the end of the first-level connecting screw, and the capillary is plugged into the third through hole of the sealing head, so as to achieve a sealed connection between the capillary and the matching piece. The connection device provided by the present application can quickly connect the pipeline in the external adapter device without the aid of other tools, and the second-level screw and the capillary cooperate to lock the connection position, and the sealing head is sleeved on the capillary, so as to reduce the generation of dead volume and achieve high-pressure sealing at the same time, thereby solving the problem that the existing capillary connection device is difficult to quickly fix the capillary, and the sealing performance is poor after connection, and it is difficult to meet the use requirements of certain high-pressure environments. The embodiment of the present application provides a hand-tightening flow path connection device, including a primary connection screw, a secondary connection screw, a capillary tube, and a sealing head;

[0005] The outer wall of the primary connecting screw is provided with a primary external thread, the first through hole is provided inside the primary connecting screw, and the first thread is provided on the primary connecting screw;

[0006] The secondary connecting screw is provided with a second thread matched with the first thread, the end of the secondary connecting screw is provided with a clamping groove, and the secondary connecting screw is provided with a second through hole connected with the clamping groove;

[0007] The sealing head is provided on a side of the primary connecting screw away from the secondary connecting screw, a third through hole is provided in the sealing head, and the first through hole, the second through hole and the third through hole are connected to form a channel for the capillary to penetrate;

[0008] The capillary passes through the sealing head, the secondary connecting screw and the primary connecting screw. The capillary includes a tube body and a stopper arranged on the tube body. The stopper is arranged at one or both ends of the tube body. The stopper is in the shape of a cylinder, a cone, a hexagonal prism, etc., with an outer diameter greater than the outer diameter of the capillary. It can also be a sleeve with an outer diameter greater than the capillary, or a combination of the two forms.

[0009] When the end surface of the stopper facing away from the primary connecting screw is installed in abutment with the end surface of the clamping slot facing the primary connecting screw, the stopper is located in the clamping slot.

[0010] In a feasible implementation, the side wall of the secondary connecting screw is provided with an insertion groove, and the insertion groove is connected with the clamping groove and the second through hole;

[0011] The width of the insertion groove is greater than the outer diameter of the tube body.

[0012] In a feasible implementation, the connecting device further includes an anti-slip ring;

[0013] The anti-slip ring is provided with an avoidance gap, and the width of the avoidance gap is greater than the outer diameter of the tube body;

[0014] The anti-slip ring is arranged on the circumference of the secondary connecting screw, and the anti-slip ring is freely rotatable relative to the secondary connecting screw; when the capillary is installed, the avoidance notch and the insertion groove are staggered.

[0015] In a feasible implementation, a connection area is provided on the peripheral wall of the secondary connection screw, and the anti-slip ring is sleeved on the connection area;

[0016] Alternatively, a peripheral wall of the secondary connecting screw is provided with a groove, and the anti-slip ring is inserted into the groove.

[0017] In a feasible implementation, the primary connecting screw includes a first pipe part and a second pipe part, and the first pipe part and the second pipe part are coaxial integral structures;

[0018] The primary external thread is arranged on the outer wall of the first pipe part, the sealing head is arranged at the end of the first pipe part away from the second pipe part, and the first thread is arranged on the second pipe part.

[0019] In a feasible implementation, the secondary connecting screw includes a third pipe part and a fourth pipe part, the third pipe part and the fourth pipe part are coaxial integral structures, the second thread is arranged on the third pipe part, and the third pipe part has the clamping groove opened toward the end of the primary connecting screw.

[0020] In a feasible implementation, a connection groove is provided at the end of the first pipe part away from the secondary connection screw, and a first internal thread is provided on the inner wall of the connection groove, and the first internal thread is the first thread;

[0021] The outer wall of the third pipe part is provided with a first external thread, the first external thread is the second thread, and the first internal thread is threadedly connected with the first external thread.

[0022] In a feasible implementation, the outer wall of the first pipe part is provided with a second external thread, and the second external thread is the first thread;

[0023] The inner wall of the clamping groove is provided with a second internal thread, the second internal thread is the second thread, and the second external thread is threadedly connected with the second internal thread.

[0024] In a feasible implementation, the sealing head includes a plug-in portion and a first vertebral portion, the plug-in portion and the first vertebral portion are coaxial integral structures, and the third through hole passes through the middle of the plug-in portion and the first vertebral portion;

[0025] An end of the first pipe part away from the second pipe part is provided with a mounting groove threadedly connected to the second through hole, and the plug-in portion of the third through hole is plugged into the mounting groove.

[0026] In a feasible implementation, the sealing head includes a connecting portion and a second vertebral portion, the connecting portion and the second vertebral portion are coaxial integral structures, the third through hole passes through the middle of the connecting portion and the second vertebral portion, and an inserting groove is provided at one end of the connecting portion away from the second vertebral portion;

[0027] An insert block is provided at one end of the first pipe part away from the second pipe part, the first through hole passes through the insert block and is coaxial with the insert block, and the insert block is inserted into the insert slot.

[0028] The embodiment of the present application provides a hand-tightened flow path connection device, the outer wall of the first-level connection screw is provided with a first-level external thread connected to the external adapter device, the capillary has a stopper, when the first-level connection screw is screwed with the second-level connection screw, the end face of the stopper abuts against the end face of the clamping groove, by adjusting the screwing length of the two-level screw, adjusting the distance that the capillary extends out of the sealing head, so that the end face of the capillary abuts against the inner wall of the matching part, realizing zero-gap matching between the capillary and the matching part, and fixing the capillary to the connection device at the same time; by providing a sealing head made of flexible material at the end of the first-level connection screw, a third through hole is provided in the middle of the sealing head, and the capillary is plugged into the third through hole, so as to realize a sealed connection between the capillary and the matching part. The connection device provided by the present application can quickly connect the pipeline in the external adapter device without the aid of other tools, and the second-level screw and the capillary cooperate to lock the connection position, the sealing head is sleeved on the capillary, reducing the generation of dead volume while realizing high-pressure sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the first hand-tightening flow path connection device provided by the present application;

[0030] Figure 2 yes Figure 1 Exploded diagram of

[0031] Figure 3 is a cross-sectional view of a first hand-tightening flow path connection device;

[0032] Figure 4 is a cross-sectional view of a second hand-tightening flow path connection device;

[0033] Figure 5 It is a schematic diagram of another structure of an anti-slip ring;

[0034] Figure 6 is a structural schematic diagram of a third hand-tightening flow path connection device;

[0035] Figure 7 yes Figure 6 Exploded diagram of

[0036] Figure 8 It is an exploded view of the fourth hand-tightening flow path connection device;

[0037] Fig. 9 It is a structural schematic diagram of another state of connection between the sealing head and the primary connecting screw;

[0038] Fig.10 is a cross-sectional view of the hand-tightening flow path connection device provided by the present application and the connection state of the matching piece;

[0039] Fig.11 It is a structural schematic diagram of the matching parts.

[0040] Description of reference numerals:

[0041] 10-first-level connecting screw; 20-second-level connecting screw; 30-capillary tube; 40-sealing head; 50-anti-slip ring;

[0042] 11-first through hole; 12-first thread; 13-primary external thread; 14-connecting groove; 15-first knurling; 16-assembly groove; 17-plug-in block;

[0043] 21-clamping groove; 22-second through hole; 23-second thread; 24-insertion groove; 25-groove; 26-second knurling; 31-tube body; 32-stopper; 41-third through hole; 42-plug-in portion; 43-first vertebral body; 44-connecting portion; 45-second vertebral body; 46-plug-in groove; 51-avoidance gap. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0045] Liquid chromatography is an instrument used to separate and analyze different components in a mixture. It uses liquid as the mobile phase, which is delivered to the chromatographic column by a high-pressure pump. The sample interacts with the stationary phase in the chromatographic column, and the distribution coefficients of different components between the stationary phase and the mobile phase are different, thus achieving separation.

[0046] Liquid chromatography has the advantages of high separation efficiency, high sensitivity and high selectivity, and is widely used in chemistry, biology, medicine, environment and other fields. It can be used to analyze various compounds, such as organic small molecules, biological macromolecules, drugs, pesticides, food additives, etc.

[0047] Liquid chromatographs are usually composed of an infusion system, an injection system, a chromatographic column, a detector, and a data processing system. The infusion system is responsible for providing a stable mobile phase; the injection system introduces the sample into the chromatographic column; the chromatographic column is the core component of separation; the detector is used to detect the separated components; and the data processing system processes and analyzes the detection signal. Different types of liquid chromatographs have different characteristics and application ranges, and the most common ones are high performance liquid chromatographs (HPLC), ultra high performance liquid chromatographs (UPLC), etc.

[0048] When using a liquid chromatograph, it is necessary to select the appropriate chromatographic column, mobile phase and detection method according to the specific analysis requirements, and calibrate and maintain the instrument to ensure the accuracy and reliability of the analysis results. Existing capillary connection devices are difficult to quickly fix the capillary, and other tools are usually required for connection, resulting in the connection device being inconvenient to use, and the sealing performance after connection is poor, which is difficult to meet the use requirements of certain high-pressure environments.

[0049] The connecting device provided by the present application is provided with a primary external thread 13 on the outer wall of the primary connecting screw 10, the primary external thread 13 is connected to the external adapter device, the primary connecting screw 10 is threadedly connected with the secondary connecting screw 20, so that the block 32 abuts against the clamping groove 21, so that the capillary and the connecting device are fixed, and a sealing head 40 made of flexible material is provided at the end of the primary connecting screw 10, and the capillary is plugged into the third through hole 41 of the sealing head 40, so that the capillary and the connecting device are sealed. The connecting device provided by the present application can quickly connect the external adapter device and the capillary without the aid of other tools, and the secondary screw and the capillary cooperate to lock the connection position, and the sealing head 40 is sleeved on the capillary, thereby reducing the generation of dead volume and achieving high-pressure sealing.

[0050] The specific structure of the hand-tightening flow path connection device provided in the present application is described in detail below in conjunction with the accompanying drawings.

[0051] Reference Figure 1-Figure 7 As shown, the embodiment of the present application provides a hand-tightening flow path connection device, including a primary connection screw 10, a secondary connection screw 20, a sealing head 40 and a capillary 30, wherein the secondary connection screw 20, the primary connection screw 10 and the sealing head 40 are connected in sequence, and the capillary 30 is plugged into the primary connection screw 10, the secondary connection screw 20 and the sealing head 40;

[0052] The outer wall of the primary connecting screw 10 is provided with a primary external thread 13, which is a universal connecting thread for matching instruments. The present connecting device can be quickly connected to an external instrument through the primary connecting screw 10; a first through hole 11 is provided inside the primary connecting screw 10, and the first through hole 11 penetrates the primary connecting screw 10 from top to bottom. The first through hole 11 is used for a capillary to penetrate the primary connecting screw 10. A first thread 12 is provided on the outer wall or inner wall of the primary connecting screw 10, and the first thread 12 is used to connect the secondary connecting screw 20;

[0053] The secondary connecting screw 20 is provided with a second thread 23 that matches the first thread 12, and the primary connecting screw 10 and the secondary connecting screw 20 are screwed together through the first thread 12 and the second thread 23;

[0054] A clamping groove 21 is provided at one end of the secondary connecting screw 20 facing the primary connecting screw 10. The clamping groove 21 may be a circular blind groove. A second through hole 22 connected to the clamping groove 21 is provided in the secondary connecting screw 20. The second through hole 22 penetrates the secondary connecting screw 20 from top to bottom. The second through hole 22 is used for a capillary to penetrate the secondary connecting screw 20.

[0055] The sealing head 40 is made of a corrosion-resistant flexible material. The sealing head 40 is provided with a first-level connecting screw 10 on a side away from the second-level connecting screw 20. A third through hole 41 is provided in the sealing head 40. The third through hole 41 is vertically arranged to penetrate the sealing head 40. The first through hole 11, the second through hole 22 and the third through hole 41 are connected to form a channel for the capillary to penetrate.

[0056] After the connection device is connected to the external equipment, the corrosion-resistant metal supports the sealing head made of corrosion-resistant flexible material, which is assembled separately and graded, making it very convenient to replace the sealing head;

[0057] The capillary 30 wraps the tube body 31 and sets a stopper 32 on the tube body 31. The stopper 32 can be a conical stopper, a cylindrical stopper or a square stopper. The stopper 32 is fixed to the outer wall of the tube body 31. A circular hole matching the outer diameter of the tube body 31 can be set in the middle of the stopper 32. The tube body 31 is inserted into the circular hole and fixedly connected with the stopper 32; Figure 3 and Figure 4 As shown, when the end face of the stopper 32 facing away from the primary connecting screw 10 is installed in abutment with the end face of the snap-in groove 21 facing the primary connecting screw 10, that is, the top end face of the stopper 32 is installed in abutment with the top plate end face of the snap-in groove 21, the stopper 32 is located in the snap-in groove 21, and the capillary 30 is fixed to the connecting device.

[0058] It is easy to think that the connection between capillaries of different diameters can also be regarded as a "stopper" for abutment. Capillaries of different diameters include at least a thin-diameter capillary and a thick-diameter capillary. The thin-diameter capillary and the thick-diameter capillary are fixedly connected and communicated. During assembly, the thick-diameter capillary is located in the secondary connecting screw 20, and a partial area of ​​the end face of the thick-diameter capillary abuts against the end face of the clamping groove 21 to fix the capillaries of different diameters to the connecting device.

[0059] The connection device provided by the present application can quickly connect the pipeline in the external adapter device without the aid of other tools, and the secondary screw and the capillary cooperate to lock the connection position, and the sealing head is sleeved on the capillary, thereby reducing the generation of dead volume and achieving high-pressure sealing; the outer wall of the primary connection screw is provided with a primary external thread connected to the external adapter device, and the capillary has a stopper. When the primary connection screw is screwed with the secondary connection screw, the end face of the stopper abuts against the end face of the clamping groove, and the distance that the capillary extends out of the sealing head is adjusted by adjusting the screw connection length of the two-stage screw, so that the end face of the capillary abuts against the inner wall of the fitting, thereby achieving zero-gap fit between the capillary and the fitting, and fixing the capillary to the connection device at the same time;

[0060] like Fig.10 and Fig.11 As shown in the figure, A is a fitting, and the fitting A can be a corrosion-resistant metal. The top of the fitting A is provided with a first circular hole a1 matching with the primary connecting screw 10, and the upper inner wall of the first circular hole a1 is provided with a connecting internal thread a5 matching with the primary external thread 13, and the lower part of the first circular hole a1 is provided with a tapered hole a2 matching with the sealing head 40, and the lower part of the tapered hole a2 is provided with a second circular hole a3 matching with the tube body 31 of the capillary 30, and the lower part of the second circular hole a3 is provided with a third circular hole a4 penetrating through the bottom end of the fitting A;

[0061] The inner diameter of the third circular hole a4 is smaller than the inner diameter of the second circular hole a3, and the second circular hole a3 and the third circular hole a4 are T-shaped, so that the bottom end of the second circular hole a3 forms a connecting surface;

[0062] When the connecting device is connected to the fitting A, the primary external thread 13 of the primary connecting screw 10 is screwed with the internal thread a5, the sealing head 40 is inserted into the tapered hole a2, and the tube body 31 is inserted into the second circular hole a3. In addition, by adjusting the screw connection length of the two-stage screws, the distance that the tube body 31 of the capillary 30 extends out of the sealing head 40 is adjusted, so that the bottom end of the tube body 31 abuts against the connecting surface of the fitting A, thereby achieving zero-gap fit between the capillary and the fitting, and fixing the capillary 30 to the connecting device at the same time.

[0063] Reference Figure 2 and Figure 4 As shown, in some embodiments, the side wall of the secondary connecting screw 20 is provided with an insertion slot 24, which is a rectangular slot body, and the insertion slot 24 is connected with the clamping slot 21 and the second through hole 22;

[0064] The width of the insertion groove 24 is greater than the outer diameter of the tube body 31 , and the capillary moves into the second through hole 22 through the insertion groove 24 .

[0065] Reference Figure 2-Figure 5 As shown, in some embodiments, the connection device further includes an anti-slip ring 50;

[0066] The anti-slip ring 50 can be made of stainless steel or other materials. The anti-slip ring 50 is provided with an avoidance gap 51. The width of the avoidance gap 51 is greater than the outer diameter of the tube body 31. The capillary enters the anti-slip ring 50 through the avoidance gap 51.

[0067] The anti-slip ring 50 is arranged on the circumference of the secondary connecting screw 20, and the anti-slip ring 50 is equivalent to the secondary connecting screw 20 being able to rotate freely;

[0068] After the capillary is installed, the anti-drop ring 50 is rotated so that the avoidance notch 51 of the anti-drop ring 50 is offset from the insertion groove 24 of the secondary connecting screw 20, thereby preventing the capillary located in the secondary connecting screw 20 from moving from the insertion groove 24 to the outside of the secondary connecting screw 20.

[0069] Reference Figure 2 and Figure 3 As shown, in some embodiments, the peripheral wall of the secondary connecting screw 20 is provided with a connecting area, the connecting area is an annular area, the anti-slip ring 50 is a circular metal ring, and the anti-slip ring 50 is sleeved in the connecting area;

[0070] Or, refer to Figure 5 As shown, the anti-slip ring 50 is a U-shaped workpiece, the peripheral wall of the secondary connecting screw 20 is provided with a groove 25, the anti-slip ring 50 is inserted into the groove 25, and the sealing end of the U-shaped workpiece corresponds to the insertion groove 24.

[0071] Reference Figure 3 and Figure 4 As shown, in some embodiments, the primary connecting screw 10 includes a first pipe part and a second pipe part, the lower part of the primary connecting screw 10 is the first pipe part, the upper part of the primary connecting screw 10 is the second pipe part, and the first pipe part and the second pipe part are a coaxial integrated structure;

[0072] The primary external thread 13 is arranged on the outer wall of the first pipe part, the sealing head 40 is arranged at one end of the first pipe part away from the second pipe part, that is, the sealing head 40 is arranged at the bottom end of the first pipe part, and the first thread 12 is arranged on the second pipe part.

[0073] In some embodiments, the secondary connecting screw 20 includes a third pipe part and a fourth pipe part, the lower part of the secondary connecting screw 20 is the third pipe part, the upper part of the secondary connecting screw 20 is the fourth pipe part, and the third pipe part and the fourth pipe part are a coaxial integrated structure;

[0074] The second thread 23 is arranged on the third pipe part, the third pipe part is threadedly connected with the second pipe part, and the third pipe part has a clamping groove 21 at one end facing the primary connecting screw 10, that is, the bottom end of the third pipe part has a clamping groove 21.

[0075] Further, in some embodiments, a connection groove 14 is provided at one end of the second pipe part facing the secondary connection screw 20, and the connection groove 14 may be a circular groove, and a first internal thread is provided on the inner wall of the connection groove 14, and the first internal thread is the first thread 12;

[0076] The outer wall of the third pipe part is provided with a first external thread, the first external thread is the second thread 23, and the first internal thread is threadedly connected with the first external thread.

[0077] In some embodiments, the outer wall of the first pipe part is provided with a second external thread, and the second external thread is the first thread 12;

[0078] The inner wall of the clamping groove 21 is provided with a second internal thread, the second internal thread is a second thread 23, and the second external thread is threadedly connected with the second internal thread.

[0079] Reference Figure 4 As shown, in some embodiments, the sealing head 40 includes a plug-in portion 42 and a first vertebral portion 43, the plug-in portion 42 is a ring, the first vertebral portion 43 is a cone, the plug-in portion 42 and the first vertebral portion 43 are a coaxial integral structure, and the third through hole 41 passes through the middle of the plug-in portion 42 and the first vertebral portion 43;

[0080] An end of the first pipe part away from the second pipe part is provided with a mounting groove 16 threadedly connected to the second through hole 22 , and the plug-in portion 42 of the third through hole 41 is plugged into the mounting groove 16 .

[0081] Reference Figure 8 and Fig. 9 As shown, in some embodiments, the sealing head 40 includes a connecting portion 44 and a second vertebral portion 45, the connecting portion 44 may be a column, the second vertebral portion 45 is a vertebral body, the connecting portion 44 and the second vertebral portion 45 are a coaxial integral structure, the third through hole 41 passes through the middle of the connecting portion 44 and the second vertebral portion 45, and an inserting groove 46 is provided at one end of the connecting portion 44 away from the second vertebral portion 45, the inserting groove 46 may be a circular slot, and the inserting groove 46 is connected to the third through hole 41;

[0082] An insert block 17 is provided at one end of the first pipe part away from the second pipe part. The insert block 17 may be a column insert block. The end of the insert block 17 is chamfered. The first through hole 11 passes through the insert block 17 and is coaxial with the insert block 17.

[0083] When the sealing head 40 is assembled with the primary connecting screw 10, the plug-in block 17 is plugged into the plug-in groove 46;

[0084] The connecting portion 44 of the sealing head 40 can be made of elastic material. In the natural state, the inner diameter of the plug-in groove 46 is smaller than the outer diameter of the plug-in block 17. When the plug-in block 17 is plugged into the plug-in groove 46, that is, the sealing head 40 is sleeved with the plug-in block 17 of the primary connecting screw 10, the connecting portion 44 of the sealing head 40 fits tightly with the plug-in block 17 of the primary connecting screw 10, which not only ensures the stability of the connection between the sealing head 40 and the primary connecting screw 10, but also facilitates the replacement of a new sealing head 40.

[0085] Reference Figure 1 As shown, in some embodiments, the outer wall of the second pipe part is provided with a first knurling 15;

[0086] The outer wall of the fourth pipe part is provided with a second knurling 26, so as to facilitate the rotation of the primary connecting screw 10 and the secondary connecting screw 20, and facilitate the connection or disassembly of the connecting device.

[0087] According to the above technical features, the working principle of the hand-tightening flow path connection device provided by the present application in the actual application scenario is:

[0088] When in use, the capillary tube 30 is moved into the second through hole 22 through the insertion groove 24, the lower part of the capillary tube 30 is inserted into the first through hole 11, and the primary connecting screw 10 and the secondary connecting screw 20 are screwed together; the sealing head 40 is installed, and the assembly groove 16 can be squeezed and deformed to clamp the plug-in portion 42 of the sealing head 40, and the tube body 31 is inserted into the third through hole 41;

[0089] The primary external thread 13 of the primary connecting screw 10 is screwed with the internal thread a5, and the inner wall of the tapered hole a2 of the fitting A supports the sealing head 40 made of corrosion-resistant flexible material, so that the sealing head 40 is stably fixed, and the tube body 31 is inserted into the second circular hole a3. In addition, by adjusting the screw connection length of the two-stage screw, the distance that the tube body 31 of the capillary 30 extends out of the sealing head 40 is adjusted, so that the top of the stopper 32 abuts against the clamping groove 21, and the bottom end of the tube body 31 abuts against the connecting surface of the fitting A, so that the capillary 30 and the fitting are matched with zero clearance, and the capillary 30 is fixed to the connecting device at the same time;

[0090] The connecting device provided in the present application can quickly connect the pipeline in the external adapter equipment without the aid of other tools. In addition, the secondary screw and the capillary 30 cooperate to lock the connection position, and the sealing head 40 is sleeved on the capillary 30, thereby reducing the generation of dead volume and achieving high-pressure sealing. This solves the problem that the existing capillary connecting device is difficult to quickly fix the capillary and has poor sealing after connection, making it difficult to meet the use requirements of certain high-pressure environments.

[0091] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0092] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A hand-tightening flow path connection device, characterized in that: include; A primary connecting screw (10), wherein the outer wall of the primary connecting screw (10) is provided with a primary external thread (13), a first through hole (11) is provided inside the primary connecting screw (10), and a first thread (12) is provided on the primary connecting screw (10); A secondary connecting screw (20), wherein the secondary connecting screw (20) is provided with a second thread (23) matching with the first thread (12), an end of the secondary connecting screw (20) is provided with a clamping groove (21), and the secondary connecting screw (20) is provided with a second through hole (22) communicating with the clamping groove (21); a sealing head (40), the sealing head (40) being arranged on a side of the primary connecting screw (10) away from the secondary connecting screw (20), a third through hole (41) being arranged in the sealing head (40), the first through hole (11), the second through hole (22) and the third through hole (41) being connected to form a channel for the capillary to penetrate; A capillary tube (30) passes through the sealing head (40), the secondary connecting screw (20) and the primary connecting screw (10), wherein the capillary tube (30) comprises a tube body (31) and a stopper (32) arranged on the tube body (31); when the end face of the stopper (32) facing away from the primary connecting screw (10) is abutted against the end face of the clamping groove (21) facing the primary connecting screw (10), the stopper (32) is located in the clamping groove (21).

2. The hand-tightening flow path connection device according to claim 1, characterized in that: The side wall of the secondary connecting screw (20) is provided with an insertion groove (24), and the insertion groove (24) is connected to the clamping groove (21) and the second through hole (22); The width of the insertion groove (24) is greater than the outer diameter of the tube body (31).

3. The hand-tightening flow path connection device according to claim 2, characterized in that: The connecting device also includes an anti-slip ring (50); The anti-slip ring (50) is provided with an avoidance notch (51), and the width of the avoidance notch (51) is greater than the outer diameter of the tube body (31); The anti-slip ring (50) is arranged on the circumference of the secondary connecting screw (20), and the anti-slip ring (50) is freely rotatable relative to the secondary connecting screw (20); when the capillary tube (30) is installed, the avoidance notch (51) and the insertion groove (24) are arranged in a staggered manner.

4. The hand-tightening flow path connection device according to claim 3, characterized in that: A connection area is provided on the peripheral wall of the secondary connection screw (20), and the anti-slip ring (50) is sleeved on the connection area; Alternatively, a groove (25) is provided on a peripheral wall of the secondary connecting screw (20), and the anti-slip ring (50) is inserted into the groove (25).

5. The hand-tightening flow path connection device according to claim 1, characterized in that: The primary connecting screw (10) comprises a first pipe part and a second pipe part, wherein the first pipe part and the second pipe part are coaxial integral structures; The primary external thread (13) is arranged on the outer wall of the first pipe part, the sealing head (40) is arranged on an end of the first pipe part away from the second pipe part, and the first thread (12) is arranged on the second pipe part.

6. The hand-tightening flow path connection device according to claim 5, characterized in that: The secondary connecting screw (20) comprises a third pipe part and a fourth pipe part, the third pipe part and the fourth pipe part are coaxial integral structures, the second thread (23) is arranged on the third pipe part, and the third pipe part is provided with the clamping groove (21) at one end facing the primary connecting screw (10).

7. The hand-tightening flow path connection device according to claim 6, characterized in that: A connection groove (14) is provided at one end of the second pipe part facing the secondary connection screw (20), and a first internal thread is provided on the inner wall of the connection groove (14), and the first internal thread is the first thread (12); The outer wall of the third pipe part is provided with a first external thread, the first external thread is the second thread (23), and the first internal thread is threadedly connected to the first external thread.

8. The hand-tightening flow path connection device according to claim 6, characterized in that: The outer wall of the first pipe part is provided with a second external thread, and the second external thread is the first thread (12); The inner wall of the clamping groove (21) is provided with a second internal thread, the second internal thread is the second thread (23), and the second external thread is threadedly connected to the second internal thread.

9. The hand-tightening flow path connection device according to claim 6, characterized in that: The sealing head (40) comprises a plug-in portion (42) and a first vertebral portion (43), the plug-in portion (42) and the first vertebral portion (43) being a coaxial integral structure, and the third through hole (41) passes through the middle of the plug-in portion (42) and the first vertebral portion (43); An end of the first pipe part away from the second pipe part is provided with an assembly groove (16) threadedly connected to the second through hole (22), and the plug-in portion (42) of the third through hole (41) is plugged into the assembly groove (16).

10. The hand-tightening flow path connection device according to claim 6, characterized in that: The sealing head (40) comprises a connecting portion (44) and a second vertebral portion (45); the connecting portion (44) and the second vertebral portion (45) are coaxial integral structures; the third through hole (41) passes through the middle of the connecting portion (44) and the second vertebral portion (45); and an inserting groove (46) is provided at one end of the connecting portion (44) away from the second vertebral portion (45); An insert block (17) is provided at one end of the first pipe part away from the second pipe part, the first through hole (11) passes through the insert block (17) and is coaxial with the insert block (17), and the insert block (17) is inserted into the insert slot (46).

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