Combined stainless steel quick coupling

Abstract

The utility model provides a kind of combined stainless steel quick connector belongs to stainless steel connector technical field, the combined stainless steel quick connector is composed of male end body, female end body, asymmetric guide key, mistake-proof coding part and sealing retaining part;The male end body and female end body are along same plug-in axis and towards suit, asymmetric guide key is integrally formed in male end body periphery, and extend along plug-in direction;The female end body inner periphery is equipped with the guide groove that is complementary with the asymmetric guide key, the guide groove only in single rotation orientation and the asymmetric guide key sliding fit;The mistake-proof coding part is located the key surface of asymmetric guide key, and with asymmetric guide key form same stainless steel body;The sealing retaining part is embedded in female end body inside and surrounds plug-in axis, after plug-in in place, radial embrace male end body realizes sealing, solve the problem that joint misplug, reverse plug, cause sealing failure and leakage due to unable visual in darkness or narrow space.

Description

Technical Field

[0001] This utility model belongs to the field of stainless steel connector technology, and specifically relates to a combined stainless steel quick connector. Background Technology

[0002] Combined stainless steel quick couplings are widely used connection devices in fluid transport systems. Their main function is to achieve quick connection and disconnection between pipelines, especially suitable for applications requiring frequent disassembly, maintenance, or replacement. These couplings typically consist of a male and a female end, connected by fitting, rotating, or pressing, and sealed with a sealing element. Made of stainless steel, they possess excellent corrosion resistance, high-temperature resistance, and high mechanical strength, making them widely used in petrochemical, shipbuilding, hydraulic systems, food and beverage, and medical equipment industries.

[0003] As industrial systems increasingly demand higher connection efficiency, safety, and ease of maintenance, the structural design of modular stainless steel quick couplings is constantly evolving. Early couplings mostly used threaded connections or simple snap-fit ​​structures, which, while providing a secure connection, had significant shortcomings in terms of operational efficiency, sealing reliability, and environmental adaptability. Therefore, in recent years, various quick coupling designs with guiding structures, automatic locking, and one-handed operation have emerged, aiming to improve connection efficiency and reduce the risk of human error.

[0004] However, despite advancements in connection speed and sealing performance, existing technologies still present numerous challenges in practical applications. Firstly, traditional modular stainless steel quick couplings generally lack effective restrictions on insertion orientation in their structural design. Operators in environments with obstructed visibility or confined spaces (such as ship bilges, mine tunnels, and equipment interiors) are prone to misinsertion, reverse insertion, or improper connection, leading to seal failure, fluid leakage, and even equipment malfunctions or safety accidents. Secondly, while some couplings incorporate guide structures, their guiding methods are often symmetrical or simple convex-concave fits, failing to fundamentally prevent reverse insertion. Furthermore, their tolerance for insertion angle errors is poor, requiring repeated adjustments even with slight deviations, severely impacting operational efficiency. Thirdly, traditional couplings often separate the sealing structure from the guide structure, making the sealing elements susceptible to uneven shearing or compression during insertion. Over time, this can lead to aging, displacement, or detachment, reducing the seal's lifespan. In addition, some connectors have external labels, color rings or electronic identification modules added to enhance identification capabilities. However, these additional structures not only increase manufacturing costs, but are also prone to falling off or failing in harsh environments, and cannot provide a stable and reliable identification method. Utility Model Content

[0005] In view of this, the present invention provides a combined stainless steel quick connector, which solves the problem of mis-insertion or reverse insertion of the connector due to lack of visual inspection in dark or confined spaces, leading to sealing failure and leakage.

[0006] This utility model is implemented as follows:

[0007] This utility model provides a combined stainless steel quick connector, which consists of a male end body, a female end body, an asymmetric guide key, an error-proof coding part, and a sealing and retaining part;

[0008] The male end body and the female end body are fitted together along the same insertion axis;

[0009] The asymmetric guide key is integrally formed on the periphery of the male end body and extends along the insertion direction;

[0010] The inner periphery of the female end body is provided with a guide groove that is complementary to the asymmetric guide key. The guide groove slides with the asymmetric guide key only in a single rotational direction.

[0011] The error-proof coding section is located on the key surface of the asymmetric guide key and forms the same stainless steel body with the asymmetric guide key;

[0012] The sealing retainer is embedded inside the female end body and surrounds the insertion axis, and after being inserted into place, it radially wraps around the male end body to achieve a seal.

[0013] The technical advantages of the combined stainless steel quick connector provided by this utility model are as follows: Through the purely mechanical shape matching of "asymmetric guide key - complementary guide groove", the connector can be inserted in the only direction by feel in the dark or narrow bottom of the tank, etc., without visual visibility. The sealing and retaining part automatically completes radial circumferential sealing at the insertion end, thus integrating "error prevention" and "sealing" into the same insertion action, completely eliminating the risk of leakage caused by incorrect insertion, and eliminating the need for additional positioning pins or electronic identification components. The structure is extremely simple and highly reliable.

[0014] Based on the above technical solution, the combined stainless steel quick connector of this utility model can be further improved as follows:

[0015] The asymmetric guide key has a key width that gradually changes along the insertion direction to form a wedge-shaped profile. The guide groove is correspondingly provided with a wedge-shaped cavity, so that the key and the groove are automatically centered and slide into the groove in one direction during the insertion process.

[0016] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the wedge-shaped gradient profile ensures that the guide key is continuously subjected to lateral force throughout the entire insertion process. This force automatically corrects the initial angle deviation until the key and groove are completely aligned and centered. Therefore, even if the worker is wearing thick gloves and is in a blind state, the key can be smoothly inserted in one go, which significantly reduces the insertion time and labor intensity, and avoids the key teeth from being bumped and deformed due to forced insertion.

[0017] Furthermore, the wedge-shaped profile of the asymmetric guide key is eccentrically arranged relative to the insertion axis, with the eccentric direction on the same side as the key width change direction, further eliminating the possibility of reverse insertion.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the wedge profile is eccentrically arranged relative to the axis to form a single-value correspondence of "key thickness-groove depth". When inserted in reverse, the key and the groove wall will generate rigid interference, achieving 100% mechanical repulsion. 180° reverse insertion accidents can be eliminated without the need for memory markings, and maintenance safety in dark places such as ship bilges and mine tunnels can be greatly improved.

[0019] Furthermore, the error-proof coding section consists of several recessed or raised characters, which are continuously arranged along the key surface and are flush with or below the key surface, for tactile identification of the insertion position.

[0020] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the recessed or raised characters are integrally formed on the key surface, so that the operator can confirm the connector model and flow direction by touch with his fingertips, avoiding the mixing of different pipelines; the characters are flush with or slightly lower than the key surface, without adding extra radial dimensions, maintaining the continuity of the outer contour of the connector, preventing the characters from being peeled off by external force, and extending the recognition life.

[0021] Furthermore, the characters in the error-proof coding section are distributed in a gradient along the insertion direction, and the character depth or height gradually increases from the insertion end inward, forming a tactile guidance sequence.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the gradient characters form a tactile sequence of "from light to dark" in the insertion direction, and the correct insertion direction can be perceived when the finger slides along the key, just like "Braille navigation", which further shortens the alignment time, and can still be clearly distinguished when wearing oily gloves, thus improving the success rate of blind insertion in a single attempt.

[0023] Furthermore, the sealing retaining part includes an annular sealing cavity and an elastic sealing body placed in the cavity. The annular sealing cavity is located downstream of the guide groove and coaxially surrounds the insertion axis. After the male end body is inserted, the sealing body is radially compressed between the outer periphery of the male end and the inner wall of the female end.

[0024] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the sealing cavity is set downstream of the guide groove and coaxially surrounds it. Once the insertion action is completed, the sealing body is automatically compressed to form a 360° continuous sealing band. This allows the error prevention structure and sealing function to be arranged in series along the same axis, shortening the overall length of the machine, reducing the number of sealing points, and reducing potential leakage paths.

[0025] Furthermore, the downstream end of the annular sealing cavity is provided with an inwardly protruding limiting shoulder, which protrudes toward the insertion axis and stops at the axial end face of the elastic sealing body to prevent the sealing body from slipping under negative pressure or backflow.

[0026] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: When the system experiences negative pressure or fluid backflow, the inner convex limiting shoulder blocks the sealing body from the axial end face, preventing it from being sucked out or displaced, thereby maintaining a long-term stable sealing specific pressure and extending the maintenance-free cycle. It is particularly suitable for water hammer back pumping conditions at the moment of pump shutdown.

[0027] Furthermore, the male end body has an inlet cone surface at its front end, which smoothly transitions to the insertion end of the asymmetric guide key, so that the key is automatically rotated and aligned by the cone surface when it deviates from the correct position.

[0028] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the tapered surface and the front end of the guide key are smoothly transitioned. When there is a small angular error in the initial orientation of the key, the tapered surface first contacts the funnel opening and generates a rotational torque, forcing the male end to automatically rotate to the correct angle, realizing the blind insertion process of "first coarse adjustment and then fine adjustment", reducing the number of tactile probes and avoiding key tooth impact damage.

[0029] Furthermore, the guide groove of the female end body is provided with an expanding funnel-shaped opening at the insertion end. The inner wall of the funnel-shaped opening is continuously tangent to the side wall of the guide groove to form a tactile guiding surface, allowing the asymmetric guide key to slide in smoothly without visual inspection.

[0030] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the expanded funnel opening enlarges the guide groove inlet into a continuous tangent guide surface, so that the asymmetric guide key can be captured by the funnel opening and slide into the groove even when the deviation angle is large. This is equivalent to providing a "tactile guide horn" for blind insertion operation, so that the insertion can be successful in one go even under the conditions of hull swaying and limited space.

[0031] Furthermore, the male end body, female end body, and asymmetric guide key are all integrally machined from the same stainless steel, and the error-proof coding part is synchronously processed and formed with the guide key surface to form an integrated blind insertion error-proof structure without welds or splicing.

[0032] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the integrated cutting and forming method eliminates the welding, splicing or gluing process, which not only eliminates the strength reduction caused by heat-affected zone or crevice corrosion, but also ensures that the asymmetric guide key, the error-proof coding part and the body maintain the same material continuity. Even in harsh environments with alternating salt spray, oil stains and mud, it can still maintain the original dimensional accuracy and tactile recognition function, significantly extend the service life of the joint and reduce maintenance costs.

[0033] Compared with existing technologies, the beneficial effects of the combined stainless steel quick connector provided by this utility model are as follows: This utility model integrates an asymmetric guiding structure, tactile recognition features, and sealing function into the same connector body, constructing a combined stainless steel quick connector with blind insertion error prevention capability, significantly improving connection reliability and operational efficiency in complex environments. Its most prominent advantage lies in the use of the asymmetric trapezoidal guide key and complementary guide groove, which structurally achieves unique insertion orientation. Even in completely dark or space-constrained environments, operators can accurately complete the insertion by touch alone, avoiding sealing failure and equipment damage caused by misinsertion or reverse insertion, fundamentally improving system safety.

[0034] Meanwhile, the error-proof coding integrated on the guide key surface allows for tactile identification of connector type or flow direction information, eliminating the need for visual identification or additional markings, thus greatly enhancing identification reliability in harsh environments. This coding is integrally formed with the guide key, avoiding the risk of detachment from traditional labels, color rings, and other easily damaged structures, ensuring clear identification functionality even after long-term use. Furthermore, the guide key features a wedge-shaped gradient contour design, automatically correcting angle deviations during insertion, making the connection smoother, reducing the number of repeated adjustments, improving operational efficiency, and reducing labor intensity.

[0035] Regarding the sealing structure, this invention places the sealing retaining part downstream of the guide groove and arranges it coaxially with the insertion axis. This allows the sealing body to be automatically compressed into a uniform sealing band after insertion, preventing the sealing element from being sheared or unevenly squeezed during insertion and extending its service life. Simultaneously, a limiting shoulder structure is provided within the sealing cavity, which effectively prevents axial slippage of the sealing body when negative pressure or fluid backflow occurs in the system, maintaining sealing stability and improving the adaptability of the joint under complex working conditions.

[0036] The overall structure is formed by integrated cutting, avoiding material discontinuities and corrosion risks associated with welding and splicing processes. This ensures that the joint maintains good dimensional accuracy and structural strength even in harsh environments such as salt spray, oil stains, and mud. At the same time, this structure simplifies the manufacturing process, reduces production costs, and facilitates large-scale application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of a first embodiment of a combined stainless steel quick coupling;

[0039] Figure 2 A side view of a first embodiment of a combined stainless steel quick coupling;

[0040] Figure 3 A diagram showing the sealing and retaining part of a first embodiment of a combined stainless steel quick connector;

[0041] Figure 4 Example diagram of a second embodiment of a combined stainless steel quick coupling;

[0042] Figure 5 A side view of a second embodiment of a combined stainless steel quick coupling;

[0043] The attached diagram lists the components represented by each number as follows:

[0044] 10. Male end body; 11. Inlet cone surface; 20. Female end body; 21. Funnel opening; 30. Asymmetric guide key; 40. Sealing and retaining part. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0046] This utility model provides a combined stainless steel quick connector, which consists of a male end body 10, a female end body 20, an asymmetric guide key 30, an error-proof coding part, and a sealing and retaining part.

[0047] The male end body 10 and the female end body 20 are fitted together facing each other along the same insertion axis;

[0048] The asymmetric guide key 30 is integrally formed on the outer periphery of the male end body 10 and extends along the insertion direction;

[0049] The inner circumference of the female end body 20 is provided with a guide groove that is complementary to the asymmetric guide key 30. The guide groove slides with the asymmetric guide key 30 only in a single rotational direction.

[0050] The error-proof coding section is located on the key surface of the asymmetric guide key 30 and forms the same stainless steel body with the asymmetric guide key;

[0051] The sealing retainer is embedded inside the female end body 20 and surrounds the insertion axis. After being inserted into place, it radially surrounds the male end body 10 to achieve a seal.

[0052] In the above technical solution, the width of the asymmetric guide key gradually changes along the insertion direction to form a wedge-shaped profile, and the guide groove is correspondingly provided with a wedge-shaped cavity, so that the key and the groove are automatically centered and slide into one direction during the insertion process.

[0053] Furthermore, in the above technical solution, the wedge-shaped profile of the asymmetric guide key is eccentrically arranged relative to the insertion axis, and the eccentric direction is on the same side as the key width change direction, further eliminating the possibility of reverse insertion.

[0054] Furthermore, in the above technical solution, the error-proof coding section consists of several recessed or raised characters, which are continuously arranged along the key surface and are flush with or below the key surface, for tactile identification of the insertion position.

[0055] Furthermore, in the above technical solution, the characters in the error-proof coding section are distributed in a gradient along the insertion direction, and the character depth or height gradually increases from the insertion end inward, forming a tactile guidance sequence.

[0056] Furthermore, in the above technical solution, the sealing and retaining part includes an annular sealing cavity and an elastic sealing body placed in the cavity. The annular sealing cavity is located downstream of the guide groove and coaxially surrounds the insertion axis. After the male end body 10 is inserted, the sealing body is radially compressed between the outer periphery of the male end and the inner wall of the female end.

[0057] Furthermore, in the above technical solution, the downstream end of the annular sealing cavity is provided with an inwardly protruding limiting shoulder. The limiting shoulder protrudes toward the insertion axis and stops at the axial end face of the elastic sealing body to prevent the sealing body from slipping under negative pressure or backflow.

[0058] Furthermore, in the above technical solution, the front end of the male end body 10 is provided with an inlet cone surface 11, which smoothly transitions with the insertion end of the asymmetric guide key, so that the key is automatically rotated and aligned by the cone surface when it deviates from the correct position.

[0059] Furthermore, in the above technical solution, the guide groove of the female end body 20 is provided with an expanding funnel-shaped opening 21 at the insertion end. The inner wall of the funnel-shaped opening 21 is continuously tangent to the side wall of the guide groove to form a tactile guiding surface, allowing the asymmetric guide key to slide in smoothly without visual inspection.

[0060] Furthermore, in the above technical solution, the male end body 10, the female end body 20 and the asymmetric guide key are all integrally machined from the same stainless steel, and the error-proof coding part is synchronously processed and formed with the guide key surface to form an integrated blind insertion error-proof structure without weld seams or splicing.

[0061] First embodiment: as follows Figure 1-3 As shown, this embodiment provides a blind-insertion, error-proof, modular stainless steel quick-connect coupling suitable for ship bilge sewage pipelines. The coupling is integrally machined from 316L stainless steel. The male end has an asymmetrical trapezoidal guide key on its outer circumference, with the key width continuously widening in a wedge shape from the insertion end. Corresponding complementary guide grooves are formed on the inner wall of the female end. Three raised transverse ridges are laser-etched on the guide key surface as error-proof coding, with the spacing between the ridges matching the width of a finger, allowing for tactile confirmation of flow direction in the dark. The sealing retainer is located downstream of the guide groove and consists of a fluororubber O-ring and a convex limiting shoulder on the female end. After insertion, the O-ring is radially compressed to form a circumferential seal.

[0062] When a ship is sailing, the bilge pump needs to be frequently disassembled and inspected. The bilge is unlit and has a height of less than half a meter. Traditional symmetrical connectors are easy to be inserted backwards, which can lead to sewage leaks and trigger alarms.

[0063] The crew member, wearing oily gloves, held the male end with one hand and inserted it into the female end. The funnel opening and the inlet cone surface first captured the key edge, and the wedge force automatically rotated to the correct position. A "click" sound was heard upon insertion, confirming that the transverse edge sequence was correct. The limiting shoulder prevented the O-ring from slipping when the pump was stopped and under negative pressure. During the six-month voyage, zero leakage and zero misinsertion were achieved, and the maintenance time was reduced from twenty minutes to three minutes.

[0064] Second embodiment: as follows Figure 4 , Figure 5 As shown, this embodiment provides a blind-fit, error-proof, combined stainless steel quick connector for use in grouting vehicles in high-altitude tunnels. Structure: Two short wedge-shaped guide keys arranged at 90-degree angles to each other are provided on the outer periphery of the male end, with key widths gradually changing in opposite directions. A corresponding double guide groove is opened on the female end. Arc-shaped recesses are milled into the key tops to form an error-proof code, with the recesses arranged to correspond to different grout grades. The sealing and retaining part adopts a double-layer O-ring series structure; the upstream ring is responsible for high-pressure grouting sealing, and the downstream ring prevents backflow during pressure relief.

[0065] The tunnel was filled with dust and the headlights were glaring. The grouting truck had to change the grouting pipes three times a day. Operators had to wear anti-freeze gloves and their vision was obstructed. Incorrect connection of ordinary joints caused the grout to solidify and block the pipes, delaying the construction period.

[0066] Operators can distinguish grout numbers by touching the arc-shaped indentation with their fingers. The double short key provides a larger initial guiding area, ensuring one-time alignment even inside the vibrating chamber. After insertion, the double-layer O-rings are compressed sequentially, with no leakage even at a grouting pressure of 20 MPa. During depressurization, the downstream ring traps residual grout, preventing mixing and contamination within the pipe. No pipe blockage occurred during the entire winter construction period, and pipe replacement time was reduced from 15 minutes to 2 minutes, ensuring continuous tunnel excavation.

[0067] Specifically, the principle of this utility model is as follows: Based on structural geometric matching and tactile feedback mechanisms, it achieves unique insertion orientation through an asymmetric guiding structure and utilizes wedge-shaped contours and tactile coding to achieve blind insertion guidance and recognition, thereby completing a highly reliable connection operation without visual inspection. Its core lies in integrating guidance, recognition, and sealing functions into the same structural system, enabling the insertion process to possess self-centering, self-recognition, and self-sealing capabilities.

[0068] First, the asymmetric guide key and complementary guide groove form a geometric locking system. The guide key is eccentrically arranged around the insertion axis, with a wedge-shaped gradient profile, while the guide groove has a completely complementary shape. Because the key and groove interfere structurally in all directions except for the unique orientation, any reverse or offset insertion is mechanically prevented, thus ensuring the uniqueness of the insertion orientation. This principle does not rely on elastic deformation or complex mechanisms, and offers extremely high structural reliability and repeatability.

[0069] Secondly, the wedge-shaped profile generates a lateral force during insertion, which drives the male end to automatically rotate to the correct angle at the initial stage of insertion, achieving a self-aligning effect. This process requires no manual adjustment and can be successfully completed even with greasy gloves, in confined spaces, or with obstructed vision, significantly improving operational efficiency.

[0070] In terms of identification, the error-proof coding section forms tactile identification features on the key surface through recessed or raised character structures. Since the characters and guide keys are integrally formed, their position, shape, and arrangement correspond one-to-one with the connector type or flow information. Operators can perceive the character sequence by sliding their fingertips, thereby confirming the connector attributes. This identification method does not rely on vision and is unaffected by dirt, oil stains, or wear, exhibiting extremely high environmental adaptability.

[0071] The sealing function relies on the linkage between the sealing retainer and the insertion action. The sealing cavity is located downstream of the guide groove. After the male end body is inserted into place, the sealing body is radially compressed between the outer circumference of the male end and the inner wall of the female end, forming a continuous sealing band. Because the sealing action occurs after the guiding is completed, the sealing body is not subjected to shearing or uneven compression during insertion, avoiding the sealing failure problem caused by the simultaneous guiding and sealing in traditional structures. Simultaneously, the limiting shoulder within the sealing cavity can prevent the sealing body from sliding from the axial end face when negative pressure or fluid backflow occurs in the system, maintaining sealing stability.

[0072] The entire joint structure is integrally machined, allowing functional areas such as the guide key, coding section, and sealing cavity to transition continuously on the same stainless steel body. This avoids structural discontinuities and stress concentrations caused by welding and splicing processes. This forming method not only improves structural strength and corrosion resistance but also simplifies the manufacturing process and reduces production costs.

Claims

1. A composite stainless steel quick coupling, characterized in that, It consists of a male end body, a female end body, an asymmetric guide key, an error-proof coding section, and a sealing and retaining section; The male end body and the female end body are fitted together along the same insertion axis; The asymmetric guide key is integrally formed on the periphery of the male end body and extends along the insertion direction; The inner periphery of the female end body is provided with a guide groove that is complementary to the asymmetric guide key. The guide groove slides with the asymmetric guide key only in a single rotational direction. The error-proof coding section is located on the key surface of the asymmetric guide key and forms the same stainless steel body with the asymmetric guide key; The sealing retainer is embedded inside the female end body and surrounds the insertion axis, and after being inserted into place, it radially wraps around the male end body to achieve a seal.

2. The combined stainless steel quick coupling according to claim 1, characterized in that, The width of the asymmetric guide key gradually changes along the insertion direction to form a wedge-shaped profile. The guide groove is correspondingly provided with a wedge-shaped cavity, so that the key and the groove are automatically centered and slide into the groove in one direction during the insertion process.

3. A combined stainless steel quick coupling according to claim 2, characterized in that, The wedge-shaped profile of the asymmetric guide key is eccentrically arranged relative to the insertion axis, with the eccentric direction on the same side as the key width change direction, further eliminating the possibility of reverse insertion.

4. A combined stainless steel quick coupling according to claim 3, characterized in that, The error-proof coding section consists of several recessed or raised characters, which are continuously arranged along the key surface and are flush with or below the key surface, for tactile identification of the insertion position.

5. A combined stainless steel quick coupling according to claim 4, characterized in that, The characters in the error-proof coding section are distributed in a gradient along the insertion direction, and the character depth or height gradually increases from the insertion end inward, forming a tactile guidance sequence.

6. A combined stainless steel quick coupling according to claim 5, characterized in that, The sealing and retaining part includes an annular sealing cavity and an elastic sealing body placed in the cavity. The annular sealing cavity is located downstream of the guide groove and coaxially surrounds the insertion axis. After the male end body is inserted, the sealing body is radially compressed between the outer periphery of the male end and the inner wall of the female end.

7. A combined stainless steel quick coupling according to claim 6, characterized in that, The downstream end of the annular sealing cavity is provided with an inwardly protruding limiting shoulder. The limiting shoulder protrudes toward the insertion axis and stops at the axial end face of the elastic sealing body to prevent the sealing body from slipping under negative pressure or backflow.

8. A combined stainless steel quick coupling according to claim 7, characterized in that, The male end body has an inlet cone surface at its front end, which smoothly transitions to the insertion end of the asymmetric guide key, so that the key is automatically rotated and aligned by the cone surface when it deviates from the correct position.

9. A combined stainless steel quick coupling according to claim 8, characterized in that, The guide groove of the female end body is provided with an expanding funnel-shaped opening at the insertion end. The inner wall of the funnel-shaped opening is continuously tangent to the side wall of the guide groove, forming a tactile guiding surface, allowing the asymmetric guide key to slide in smoothly without visual inspection.

10. A combined stainless steel quick coupling according to claim 9, characterized in that, The male end body, female end body, and asymmetric guide key are all integrally machined from the same stainless steel. The error-proof coding part and the guide key surface are processed synchronously to form an integrated blind insertion error-proof structure without welds or splicing.

Images