A quick connector

Abstract

A quick connector includes a housing assembly, an inner sleeve, a valve housing assembly, a valve assembly, a sealing assembly, and a first return spring. The housing assembly has a pressure relief hole on its side wall; the inner sleeve contains a hollow connecting tube with a through hole and a first annular groove, and its sealing section has a liquid outlet communicating with the pressure relief hole; the valve housing assembly is axially movable and fitted outside the inner sleeve, containing a first cavity and a second cavity connected by the connecting hole, the second cavity wall having a second liquid inlet hole, and an end having a through hole for inserting the hollow connecting tube; the sealing assembly is fitted around the outer circumference of the hollow connecting tube. When the external connector is inserted, it pushes the valve housing assembly to move, causing the sealing component to move into the first annular groove to form a pressure relief channel. High-pressure liquid is discharged sequentially through this channel, the hollow connecting tube, the through hole, the liquid outlet, and the pressure relief hole, achieving synchronous insertion and pressure relief. This invention solves the docking difficulties caused by high-pressure locking, allowing connection to be completed without stopping the machine, significantly improving the operating efficiency of tractor and agricultural implement hydraulic systems.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system control technology, specifically to a quick connector suitable for hydraulic passage connection scenarios between tractors and agricultural implements. Background Technology

[0002] In agricultural machinery operations, the hydraulic connections between tractors and implements such as seeders, harvesters, and plows require quick-connect couplings, and the efficiency of this connection directly affects the overall work progress. Existing tractor-implant hydraulic systems typically maintain stable high pressure to ensure reliable power transmission, but this can easily cause the valve core inside the quick-connect coupling to remain in a continuously tightened state, creating a "high-pressure lock-up," making it difficult to insert the external workpiece on the implement side.

[0003] The currently common "shutdown and depressurization" method requires operators to first shut down the tractor engine and wait for the system pressure to drop to zero naturally before inserting an external fork to complete the connection. This method has significant drawbacks: agricultural operations require high efficiency, and frequent starting and stopping of the tractor seriously occupies effective working time, which can easily delay progress when multiple implements are working alternately; at the same time, the hydraulic parameters need to be readjusted after the tractor is restarted, which is a cumbersome process and parameter deviations may affect the accuracy of implement operation.

[0004] To address the aforementioned issues, existing technologies have attempted related improvements. For example, Chinese invention patent application No. 202311278887.6 (publication number CN117704174A), entitled "Female Connector for Hydraulic Quick-Connect," proposes a push-pull connection structure. This structure, by incorporating a connecting sleeve, locking sleeve, multiple springs, and seals within the housing, and providing a vent at the front of the connector body, aims to improve the ease of interface replacement and reduce connection resistance, thus improving usability and reliability to some extent. However, this solution primarily focuses on simplifying the connection operation and reducing resistance, failing to address the fundamental issue of "high-pressure locking" through a pressure relief mechanism. The vent is only used to balance pressure changes and cannot effectively release high-pressure oil; it still requires shutdown or additional operation to release the lock, failing to achieve "synchronous insertion of the external connector and pressure relief," and thus cannot fundamentally improve docking efficiency under high-pressure conditions.

[0005] In summary, existing technologies have not yet established a coordinated mechanism between "no external triggering – synchronous pressure relief upon insertion – high-pressure sealing". Current solutions either rely on cumbersome shutdown operations or only optimize the connection mechanical structure while neglecting the high-pressure relief requirement, generally resulting in complex operation and low docking efficiency. Therefore, there is an urgent need for a compact solution that can simultaneously complete pressure relief and maintain high-pressure sealing performance when an external fork is inserted, in order to significantly improve docking efficiency and system reliability. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a quick connector with a compact structure that can simultaneously release pressure when an external foreman is inserted, in light of the above-mentioned technical status.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: the quick connector, comprising...

[0008] The outer casing assembly has an inlet at the first end, an opening at the second end, and a pressure relief hole through the side wall.

[0009] The inner sleeve is located inside the outer shell assembly. One end has an opening, and the outer periphery has a sealing section that seals with the inner wall of the outer shell assembly. The sealing section has a first liquid inlet hole that runs horizontally through it, and a liquid outlet that extends radially to the inner wall of the inner sleeve and connects to the pressure relief hole. The inner sleeve also has an axially extending hollow connecting pipe with an open end. The pipe wall of the hollow connecting pipe has a through hole, and the outer periphery has a first annular groove.

[0010] The valve housing assembly is axially movable within the outer housing assembly, with a portion of its structure extending into the inner sleeve. It forms a first cavity and a second cavity connected by a communication port. The first cavity has an insertion port corresponding to the opening of the outer housing assembly for inserting an external tool. The wall of the second cavity has a second liquid inlet hole. The end of the valve housing assembly away from the first cavity has a perforation for inserting the hollow connecting pipe.

[0011] A valve assembly, located within a valve housing assembly and movable with the valve housing assembly, includes a valve head and a valve sleeve. The valve head extends into the valve sleeve and can move axially relative to the valve sleeve. It can also open the communication port between the first and second chambers under the push of an external tool. A third liquid inlet is provided on the valve head.

[0012] A sealing assembly is disposed on the valve housing assembly and sleeved on the outer periphery of the hollow connecting pipe. It includes a sealing element. In the non-pressure relief state, the sealing element is sleeved on the outer periphery of the hollow connecting pipe to seal the end opening of the hollow connecting pipe, so that the second cavity forms a high-pressure seal. High-pressure liquid enters from the inlet and flows into the second cavity in sequence through the first liquid inlet hole, the second liquid inlet hole, and the third liquid inlet hole.

[0013] The first return spring is connected between the valve housing assembly and the inner sleeve. It is used to drive the valve housing assembly to return to its original position after the external tool is pulled out, so that the second cavity can be sealed again.

[0014] When the external fork is inserted into the insertion port and pushes the valve body assembly toward the hollow connecting pipe by the insertion action alone, the sealing member moves synchronously with the valve body assembly to the corresponding outer peripheral side of the first annular groove and forms a gap with the first annular groove. This gap constitutes a pressure relief channel. High-pressure liquid enters the interior of the hollow connecting pipe through the pressure relief channel and the end opening of the hollow connecting pipe in sequence, and then exits through the through hole, the liquid outlet and the pressure relief hole, so as to realize the synchronous insertion of the external fork and the system pressure relief.

[0015] To improve the sealing reliability between the inner sleeve and the outer shell assembly and achieve multi-channel uniform pressure relief and optimize oil drainage efficiency, preferably, the outer periphery of the sealing section of the inner sleeve is provided with two spaced first sealing rings, and a circumferentially extending second annular groove is formed between the two first sealing rings. The inner sleeve has multiple liquid outlets, each of which extends radially to the inner wall of the inner sleeve and communicates with the second annular groove. The outer shell assembly has multiple pressure relief holes, each of which is connected to the second annular groove.

[0016] To enhance the structural integrity and sealing performance of the sealing assembly and to precisely guide the pressure relief oil path, preferably, the sealing assembly further includes a sealing sleeve and a gasket bracket. One end of the sealing sleeve is an open end, and its inner diameter is larger than the outer diameter of the hollow connecting pipe. There are two sealing elements, which are spaced apart and connected to the open side of the sealing sleeve, and the two sealing elements are connected by the gasket bracket. In the non-pressure relief state, the two sealing elements are respectively fitted onto the outer periphery of the hollow connecting pipe located on both sides of the first annular groove. In the pressure relief state, the sealing assembly moves synchronously with the valve body assembly, so that the sealing elements are aligned with the first annular groove. The high-pressure liquid flows sequentially through the first annular groove, the gap between the outer periphery of the hollow connecting pipe and the inner wall of the sealing sleeve, the end opening of the hollow connecting pipe, the through hole, the liquid outlet, and the pressure relief hole before being discharged.

[0017] To ensure the stability of valve sleeve movement and the reliability of reset sealing, preferably, the valve sleeve is movably disposed within the valve housing assembly, and a third sealing ring is provided between the outer periphery of the valve sleeve and the inner wall of the valve housing assembly; it also includes a second reset spring, which is disposed between the valve sleeve and the sealing assembly, and is used to drive the valve sleeve to reset after the external tool is pulled out.

[0018] To utilize hydraulic pressure for auxiliary piston drive and one-way locking, optimize valve head reset performance, and prevent oil backflow, preferably, the valve assembly further includes a piston and a third reset spring; the piston is built into the valve sleeve and can move axially relative to it; the third reset spring is located between the piston and the valve head and is used to drive the piston to reset; the piston has a liquid passage extending axially through it, and a one-way plug is provided in the liquid passage, the one-way plug being configured to allow liquid to flow unidirectionally from the first side near the valve head to the second side where the plugging assembly is located.

[0019] To improve the fluid flow at the opening end of the inner sleeve and prevent hydraulic oil from stagnating or generating eddies, preferably, the opening end of the inner sleeve is provided with multiple notches, which are used to allow liquid to flow smoothly from the first inlet hole to the second inlet hole.

[0020] To optimize the processing and assembly of the valve housing assembly and to achieve a modular layout of the functional cavities, preferably, the valve housing assembly includes a first valve housing and a second valve housing, the first valve housing and the second valve housing together forming the second cavity; the first cavity is disposed on the second valve housing, and the second liquid inlet and the perforation are both disposed on the first valve housing.

[0021] To achieve convenient maintenance and high-strength sealing of the housing assembly, and to adapt to structural stability under complex working conditions, preferably, the housing assembly includes a first housing and a second housing, the first housing and the second housing are detachably connected by threads, the inlet and pressure relief hole are provided on the first housing, and the opening of the housing assembly is provided on the second housing; a fourth sealing ring is provided between the outer periphery of the valve housing assembly and the inner wall of the second housing.

[0022] To achieve mechanical self-locking after connection, prevent accidental disengagement of the external fork, and improve the safety of continuous equipment operation, preferably, a connecting sleeve is provided between the second outer shell and the valve shell assembly. The peripheral wall of the second valve shell has multiple through-holes with conical holes, each containing a ball bearing. The inner wall of the connecting sleeve has an inclined surface that mates with the ball bearing. When the valve shell assembly moves in the depressurization direction, the ball bearing disengages from the inclined surface and can move radially outward. When the external fork is inserted and the valve shell assembly is reset, the inclined surface of the connecting sleeve presses against the ball bearing, locking and positioning the external fork.

[0023] In order to improve the sealing and centering of the valve head when closed by means of a conical sealing pair and to limit excessive movement of the valve head, preferably, a first conical surface is formed on the outer periphery of the valve head, an annular seal is provided on the first conical surface, and a second conical surface adapted to the first conical surface is formed on the communication port. When the valve head is driven to reset in the direction of the first cavity by the first return spring, the first conical surface abuts against the second conical surface to limit excessive movement of the valve head.

[0024] In order to achieve targeted recovery of the pressure relief liquid to avoid resource waste and environmental pollution, and at the same time ensure the sealing reliability of the connection between the outer pipe and the first shell to prevent liquid leakage, the first shell is also provided with an outer pipe that communicates with the pressure relief hole. The outer pipe is used to connect the pressure relief recovery pipeline, and a fifth sealing ring is provided at the connection between the outer pipe and the first shell.

[0025] Compared with the prior art, the advantages of this utility model are as follows: By integrating a housing assembly, an inner sleeve, a valve housing assembly, a valve assembly, a sealing assembly, and a first return spring into a quick connector, and by providing a hollow connecting tube with a first annular groove and a through hole inside the inner sleeve, and forming a communicating cavity with an insertion port and a second liquid inlet hole inside the valve housing assembly, and by placing the sealing assembly around the outer periphery of the hollow connecting tube; when an external tool is inserted, the valve housing assembly can be moved by the insertion action alone, causing the sealing component to move synchronously to the first annular groove to form a pressure relief channel, through which high-pressure liquid flows through the hollow connecting tube. The nozzle end opening, through hole, liquid outlet, and pressure relief hole allow for rapid discharge. This structure enables the pressure relief process to be completed automatically and synchronously with the insertion of the external tool, without the need to stop the machine to relieve pressure or perform any additional operations. This completely solves the docking difficulties caused by high pressure locking. Users can instantly release the high pressure of the system simply by inserting the external tool in a normal working posture. This not only avoids the waste of working time caused by frequent tractor starts and stops and the progress delays when multiple implements are used alternately, but also eliminates the accuracy deviation caused by the re-adjustment of hydraulic parameters after restarting. This significantly improves the efficiency of the hydraulic connection between the tractor and agricultural implements. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0027] Figure 2 This is a schematic diagram of the decomposed state structure of this embodiment;

[0028] Figure 3 This is a schematic diagram of the exploded state structure of the valve assembly in this embodiment;

[0029] Figure 4 This is a schematic diagram of the exploded state structure of the blocking component in this embodiment;

[0030] Figure 5 This is a three-dimensional structural diagram of the inner sleeve in this embodiment;

[0031] Figure 6 This is a schematic diagram of the three-dimensional structure of the hollow connecting tube in this embodiment;

[0032] Figure 7 This is a cross-sectional view of the structure in this embodiment;

[0033] Figure 8 for Figure 7 A magnified structural diagram of part A;

[0034] Figure 9 This is a cross-sectional view of the structure in this embodiment (in an undepressurized state);

[0035] Figure 10 This is a cross-sectional structural diagram of this embodiment (depressurization state after the valve housing assembly is moved). Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] Figures 1-10 The figure shown is the preferred embodiment of this utility model.

[0038] The quick connector in this embodiment mainly includes a housing assembly 1, an inner sleeve 2, a valve housing assembly 3, a valve assembly 4, a sealing assembly 5, and a first return spring 6. It is also equipped with a first sealing ring 7, a third sealing ring 8, a second return spring 9, a third return spring 10, a fourth sealing ring 11, a connecting sleeve 12, a ball bearing 13, an annular seal 14, an outer pipe 15, and a fifth sealing ring 16. It aims to solve the problem of "high-pressure locking" in existing quick connectors for tractor-implant hydraulic passages, which makes it difficult for external foreman to connect, requires machine shutdown for pressure relief, and is inefficient. Through the synergistic effect of "external foreman insertion pushing the valve housing assembly to move - the sealing component and the annular groove forming a pressure relief channel - high-pressure liquid synchronously releasing", synchronous pressure relief without stopping the machine or additional operation is achieved, while ensuring high-pressure sealing performance in non-pressure relief state, improving docking efficiency and system reliability.

[0039] The structure and connection relationship of each component in this embodiment are as follows:

[0040] Housing assembly 1: Housing assembly 1: Reference Figure 1 and Figure 7 As shown, the outer casing assembly 1 can be made of high-strength aluminum alloy and is cylindrical in shape, including a first outer casing 1d and a second outer casing 1e, which are detachably connected by external and internal threads. The first outer casing 1d has a circular inlet 1a at its first end; four pressure relief holes 1c are evenly distributed along the circumference of the side wall of the first outer casing 1d, with the axis of each pressure relief hole 1c perpendicular to the axis of the first outer casing 1d; the outer pipe 15 and the fifth sealing ring 16 are optional configurations. When it is not necessary to recover the pressure relief liquid, the outer pipe 15 can be omitted, and the high-pressure liquid can be discharged directly through the pressure relief hole 1c; when it is necessary to recover the pressure relief liquid, an outer pipe 15 is provided on the outer periphery of the first outer casing 1d, one end of which is connected to the corresponding pressure relief hole 1c, and the other end is used to connect to the pressure relief recovery pipeline. A fifth sealing ring 16 is provided at the connection between the outer pipe 15 and the first outer casing 1d. The fifth sealing ring 16 is an O-ring used to prevent liquid leakage. The end of the second housing 1e away from the first housing 1d forms a circular opening 1b. A fourth sealing ring 11 is provided between the outer periphery of the valve housing assembly 3 and the inner wall of the second housing 1e. The fourth sealing ring 11 is an O-ring, which is embedded in the annular groove of the inner wall of the second housing 1e to achieve dynamic sealing.

[0041] Inner Sheet 2: Reference Figure 2 , Figure 5 and Figure 7As shown, the inner sleeve 2 is a one-piece molded part, fitted inside the first outer shell 1d, with one end forming an opening near the second outer shell 1e and the other end closed. An annular sealing section 2a is provided in the middle of the outer periphery of the inner sleeve 2, the outer diameter of which matches the inner diameter of the first outer shell 1d. Two first sealing rings 7 are axially spaced around the outer periphery of the sealing section 2a, forming a circumferentially extending second annular groove 2e between the two first sealing rings 7. Four transversely penetrating first liquid inlet holes 2b are evenly provided on the sealing section 2a. The inlet end of the first liquid inlet hole 2b connects to the inlet 1a of the first outer shell 1d, and the outlet end connects to the gap between the outer shell assembly 1 and the inner sleeve 2. This gap also connects to the gap between the inner sleeve 2 and the valve housing assembly 3, allowing liquid to flow through the notch 2f to the second liquid inlet hole 3c1 on the first valve housing 3e. The inner sleeve 2 has four liquid outlets 2c evenly distributed circumferentially on its sidewall. Each liquid outlet 2c extends radially, with its inner end penetrating the inner wall of the inner sleeve 2 and its outer end communicating with the second annular groove 2e. Each pressure relief hole 1c corresponds to the second annular groove 2e. A hollow connecting pipe 2d is integrally formed axially inside the inner sleeve 2. One end of the hollow connecting pipe 2d is connected to the closed end of the inner sleeve 2, and the other end is open. The wall of the hollow connecting pipe 2d has four through holes 2d1 evenly distributed circumferentially, and a first annular groove 2d2 is provided in the center of its outer periphery. The open end of the inner sleeve 2 has four notches 2f evenly distributed circumferentially to ensure smooth liquid flow.

[0042] Valve housing assembly 3: Reference Figure 2 and Figure 7 As shown, the valve housing assembly 3 includes a first valve housing 3e and a second valve housing 3f, which are detachably connected by threads and enclose each other to form the second cavity 3c. The valve housing assembly 3 is axially movable inside the outer housing assembly 1, and a portion of its structure extends into the inner sleeve 2. Specifically, the section of the first valve housing 3e away from the second valve housing 3f extends into the internal cavity of the inner sleeve 2, and the second valve housing 3f is entirely located inside the second outer housing 1e of the outer housing assembly 1. The valve housing assembly 3 can move smoothly axially within the fitting space between the outer housing assembly 1 and the inner sleeve 2, and the outer periphery of the first valve housing 3e is clearance-fitted with the inner wall of the inner sleeve 2, which does not affect the axial movement.

[0043] The first cavity 3b is disposed on the second valve housing 3f: the end of the second valve housing 3f away from the first valve housing 3e is integrally formed with a cylindrical first cavity 3b, the end of the first cavity 3b is provided with a circular insertion port 3b1, the insertion port 3b1 is coaxially corresponding to the opening 1b of the outer shell assembly 1, for the external foreman to be precisely inserted; a conical connecting port 3a is provided between the first cavity 3b and the second cavity 3c to ensure the continuity of the liquid flow path, and the inner wall of the connecting port 3a is also formed with a second conical surface 3a1.

[0044] Both the second inlet hole 3c1 and the perforation 3d are provided on the first valve shell 3e: four second inlet holes 3c1 are evenly provided on the circumferential wall of the first valve shell 3e, and each second inlet hole 3c1 penetrates the circumferential wall. Since the first valve shell 3e extends into the inner sleeve 2, the outer end of the second inlet hole 3c1 can directly connect to the gap between the opening end of the inner sleeve 2 and the valve shell assembly 3 to receive the liquid flowing out from the first inlet hole 2b, and the inner end connects to the second cavity 3c to ensure that the high-pressure liquid flows in smoothly; the end of the first valve shell 3e away from the second valve shell 3f (that is, the end of the valve shell assembly 3 away from the first cavity 3b) is provided with a circular perforation 3d. The inner diameter of the perforation 3d is adapted to the outer diameter of the hollow connecting tube 2d, so that the hollow connecting tube 2d can be inserted and the two are fitted with a clearance to ensure that when the valve shell assembly 3 moves axially, the perforation 3d can slide along the outer wall of the hollow connecting tube 2d without jamming.

[0045] In addition, four through-holes 3f1 are evenly provided on the circumferential wall of the second valve housing 3f. The axis of each through-hole 3f1 is perpendicular to the axis of the second valve housing 3f. Each through-hole 3f1 is fitted with a high-carbon steel ball 13. The diameter of the ball 13 is slightly larger than the minimum diameter of the through-hole 3f1, which not only prevents the ball 13 from falling out of the through-hole 3f1, but also ensures that it can move radially along the through-hole 3f1, and cooperates with the connecting sleeve 12 to achieve the locking of the forehead.

[0046] Valve assembly 4: Reference Figure 2 , Figure 3 and Figure 7 As shown, valve assembly 4 is located in the second cavity 3c and includes a valve head 4a, a valve sleeve 4b, a piston 4c, and a third return spring 10. The valve sleeve 4b is axially movable within the second cavity 3c, and a third sealing ring 8, an O-ring, is fitted inside its annular groove to achieve a seal with the inner wall of the second cavity 3c. The valve sleeve 4b is hollow and open at both ends. The valve head 4a partially extends into the valve sleeve 4b and can move axially relative to it. Specifically, the end of the valve head 4a near the first cavity 3b protrudes outside the opening of the valve sleeve 4b facing the first cavity 3b (to facilitate receiving external thrust), while the end near the piston 4c extends into the valve sleeve 4b. The outer wall of the section where the valve head 4a extends into the valve sleeve 4b is flush with the valve sleeve 4b. The inner wall clearance fit ensures that the valve head 4a can move without jamming along the axial direction of the valve sleeve 4b; a first conical surface 4a2 is formed on the outer periphery of the valve head 4a, which is adapted to the second conical surface 3a1 of the connecting port 3a, and an annular sealing element 14 is sleeved on the first conical surface 4a2; four third liquid inlet holes 4a1 are evenly opened in the circumferential direction on the side wall of the valve head 4a, the third liquid inlet holes 4a1 are located in the section of the valve head 4a exposed outside the opening of the valve sleeve 4b, and penetrate the pipe wall radially, and the outlet end of each third liquid inlet hole 4a1 penetrates into the internal channel of the valve head 4a so that liquid can flow into the interior of the valve sleeve 4b.

[0047] The piston 4c is built into the valve sleeve 4b and can move axially relative to the valve sleeve 4b. It has a liquid channel 4c1 running through it axially. The end of the liquid channel 4c1 near the valve head 4a is provided with a conical seat that is adapted to the one-way plug 4c2. The one-way plug 4c2 is placed on the conical seat. The one-way plug 4c2 is configured to allow liquid to flow unidirectionally from the first side near the valve head 4a to the second side where the sealing assembly 5 is located. When the high-pressure liquid enters the valve sleeve 4b through the third inlet hole 4a1, the liquid pressure pushes the one-way plug 4c2 away from the conical seat, and the liquid can flow through the liquid channel 4c1 to the depth of the second chamber 3c. If the liquid has a reverse flow tendency, the reverse pressure will make the one-way plug 4c2 fit tightly against the conical seat, sealing the liquid channel 4c1 and preventing the high-pressure liquid from flowing back to the first chamber 3b, which would cause sealing failure or pressure fluctuation. The third reset spring 10 is a cylindrical helical compression spring, sleeved between the valve head 4a and the piston 4c. One end abuts against the end face of the valve head 4a, and the other end abuts against the end face of the piston 4c, used to drive the piston 4c to reset.

[0048] Blocking component 5: Reference Figure 2 , Figure 4 and Figure 8 As shown, the sealing assembly 5 is located at the inner end of the first valve housing 3e away from the second valve housing 3f, and is fitted around the outer periphery of the hollow connecting pipe 2d. It includes two sealing elements 5a, a sealing sleeve 5b, and a gasket bracket 5c. The sealing sleeve 5b is a cylindrical sleeve with an open end and an inner diameter larger than the outer diameter of the hollow connecting pipe 2d, forming an annular gap. The sealing elements 5a are polyurethane annular sealing gaskets. The two sealing elements 5a are arranged axially at intervals and are connected to the inner wall of the open side of the sealing sleeve 5b by an interference fit. The inner diameter of the sleeve matches the outer diameter of the hollow connecting pipe 2d. The gasket bracket 5c is a metal annular piece, sandwiched between the two sealing elements 5a and fixedly connected to them. It is used to support the sealing elements 5a to prevent high-pressure deformation. The sealing element 5a away from the sealing sleeve 5b is fixed to the end of the second valve housing 3f, thereby fixing the entire sealing assembly 5 onto the valve housing assembly 3.

[0049] First reset spring 6 and second reset spring 9: (Reference) Figure 7 As shown, the first return spring 6 is a cylindrical helical compression spring, sleeved in the gap between the inner sleeve 2 and the valve housing assembly 3. One end abuts against the outer peripheral stepped surface of the valve housing assembly 3, and the other end abuts against the inner peripheral stepped surface of the inner sleeve 2 near the opening end, for driving the valve housing assembly 3 to return to its original position. The second return spring 9 is a cylindrical helical compression spring, one end abutting against the outer peripheral stepped surface of the valve sleeve 4b, and the other end abutting against the outer peripheral stepped surface of the sealing sleeve 5b, for driving the valve sleeve 4b to return to its original position and maintaining a sealing fit with the valve housing assembly 3.

[0050] Connecting sleeve 12: Reference Figure 7As shown, the connecting sleeve 12 is a cylindrical sleeve that is fitted in the gap between the second outer shell 1e and the valve shell assembly 3. One end is connected to the inner wall of the second outer shell 1e through a compression spring, and the other end is a free end. An inclined surface 12a is formed on the inner wall of the connecting sleeve 12. The inclination angle of the inclined surface 12a is adapted to the axis angle of the tapered hole 3f1, which is used to squeeze the ball 13 to achieve external locking.

[0051] The working principle of the quick connector in this embodiment is as follows:

[0052] 1. Non-pressure relief state (standby / operating state)

[0053] Under the elastic force of the first return spring 6, the valve housing assembly 3 is in the initial position of sealing the hollow connecting pipe 2d; the two sealing parts 5a of the sealing assembly 5 are respectively sleeved on both sides of the first annular groove 2d2, tightly fitting the outer wall of the hollow connecting pipe 2d, sealing its end opening; under the elastic force of the third return spring 10, the valve head 4a remains partially inserted into the valve sleeve 4b, and moves axially relative to the valve sleeve 4b towards the first cavity 3b to reset, until the first conical surface 4a2 abuts against the second conical surface 3a1, the annular seal 14 achieves sealing, isolates the first cavity 3b from the second cavity 3c, and maintains the high pressure state of the second cavity.

[0054] Liquid Flow: High-pressure liquid from the tractor side flows into the gap between the first outer shell 1d and the inner sleeve 2 from inlet 1a, flows in through the first inlet hole 2b, and then flows through the notch 2f to the second inlet hole 3c1 on the first valve shell 3e, entering the second chamber 3c. After the external tool head is inserted and pushes the valve head 4a to move, the first chamber 3b and the second chamber 3c are connected. Liquid flows from the second chamber 3c into the first chamber 3b through the connecting port 3a, and then power is delivered through the agricultural implement pipeline. The one-way plug 4c2 opens under liquid pressure, and the liquid flows through the liquid channel 4c1 to the sealing component 5 side. The reverse flow is blocked to prevent backflow (see details). Figure 9 As shown in the diagram, the arrows indicate the direction of liquid flow.

[0055] 2. Depressurization state (external foreman insertion process):

[0056] Synchronous trigger pressure relief: The external end cap is aligned with the opening 1b and inserted into the first cavity 3b, contacting the end face of the valve head 4a; the external end cap is further inserted, overcoming the elastic force of the first reset spring 6 to push the valve body assembly 3 towards the hollow connecting pipe 2d; the sealing assembly 5 moves synchronously, so that the sealing part 5a corresponds to the first annular groove 2d2, forming an annular pressure relief channel.

[0057] High-pressure liquid release: High-pressure liquid in the second chamber 3c flows into the gap between the sealing sleeve 5b and the hollow connecting pipe 2d, enters the first annular groove 2d2 through the pressure relief channel, then enters its interior through the end opening of the hollow connecting pipe 2d, flows out through the through hole 2d1 to the gap between the inner sleeve 2 and the hollow connecting pipe 2d, flows into the second annular groove 2e through the liquid outlet 2c, and finally is discharged through the pressure relief hole 1c. Some liquid enters the recovery pipeline through the outer pipe 15, eliminating the "high-pressure lock-up", and the external foreman can be easily inserted into place (see details). Figure 10 As shown in the diagram, the arrows indicate the direction of liquid depressurization.

[0058] External fork locking and positioning: After the external fork is inserted into place, the operator stops applying force, and the first return spring 6 pushes the valve housing assembly 3 to reset; during the reset process, the ball 13 on the second valve housing 3f contacts the inclined surface 12a, and the inclined surface 12a generates a radial inward squeezing force on the ball 13, causing the ball 13 to move towards the inside of the conical hole 3f1 and press against the pre-set groove on the outer periphery of the external fork, thereby achieving external fork locking and positioning; at the same time, the valve head 4a slightly resets, and the first conical surface 4a2 and the second conical surface 3a1 maintain a gap, ensuring that the first cavity 3b and the second cavity 3c are connected, and the liquid is normally delivered to the agricultural implement.

[0059] 3. External foreman pulls out and component reset

[0060] During disassembly, the operator pulls the external fork, which overcomes the locking force of the ball bearing 13 and moves the valve body assembly 3. The ball bearing 13 disengages from the inclined surface 12a and moves radially outward to release the lock. After the external fork is pulled out, the first return spring 6 pushes the valve body assembly 3 to reset, and the sealing part 5a is re-fitted onto both sides of the first annular groove 2d2 to seal the opening at the end of the hollow connecting pipe 2d. The second cavity 3c restores the high-pressure seal. The second return spring 9 pushes the valve sleeve 4b to reset, and the third return spring 10 pushes the piston 4c and valve head 4a to reset. The first conical surface 4a2 and the second conical surface 3a1 abut and seal, and the connector returns to the non-pressure relief state.

[0061] Furthermore, in the description of this embodiment, the terms "front," "rear," "left," "right," "up," and "down," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing this utility model 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 utility model. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A quick connector, characterized in that: include The outer casing assembly (1) has an inlet (1a) at its first end, an opening (1b) at its second end, and a pressure relief hole (1c) through its sidewall. The inner sleeve (2) is located inside the outer shell assembly (1). One end of the inner sleeve has an opening, and the outer periphery has a sealing section (2a) that seals with the inner wall of the outer shell assembly (1). The sealing section (2a) has a first liquid inlet hole (2b) that is transversely through it, and a liquid outlet (2c) that extends radially to the inner wall of the inner sleeve (2) and communicates with the pressure relief hole (1c). The inner sleeve (2) also has an axially extending hollow connecting pipe (2d) with an open end. The hollow connecting pipe (2d) has a through hole (2d1) on its pipe wall and a first annular groove (2d2) on its outer periphery. The valve housing assembly (3) is axially movable within the outer housing assembly (1), and a portion of its structure extends into the inner sleeve (2). Inside, a first cavity (3b) and a second cavity (3c) are formed, connected by a connecting port (3a). The first cavity (3b) is provided with an insertion port (3b1) corresponding to the opening (1b) of the outer housing assembly for insertion of an external tool. The cavity wall of the second cavity (3c) is provided with a second liquid inlet hole (3c1). The end of the valve housing assembly (3) away from the first cavity (3b) is provided with a perforation (3d) for insertion of the hollow connecting pipe (2d). A valve assembly (4) is located inside the valve housing assembly (3) and can move with the valve housing assembly (3). It includes a valve head (4a) and a valve sleeve (4b). The valve head (4a) extends into the valve sleeve (4b) and can move axially relative to the valve sleeve (4b). It can also open the communication port (3a) between the first chamber (3b) and the second chamber (3c) under the push of an external tool. A third liquid inlet hole (4a1) is provided on the valve head (4a). The sealing assembly (5) is disposed on the valve housing assembly (3) and sleeved on the outer periphery of the hollow connecting pipe (2d). It includes a sealing element (5a). In the non-depressurization state, the sealing element (5a) is sleeved on the outer periphery of the hollow connecting pipe (2d) to seal the end opening of the hollow connecting pipe (2d), so that the second cavity (3c) forms a high-pressure seal. The high-pressure liquid enters from the inlet (1a) and flows into the second cavity (3c) in sequence through the first liquid inlet hole (2b), the second liquid inlet hole (3c1), and the third liquid inlet hole (4a1). The first return spring (6) is connected between the valve housing assembly (3) and the inner sleeve (2) and is used to drive the valve housing assembly (3) to reset after the external tool is pulled out, so that the second cavity (3c) can be sealed again. When the external fork is inserted into the insertion port (3b1) and pushes the valve housing assembly (3) towards the hollow connecting pipe (2d) by the insertion action, the sealing member (5a) moves synchronously with the valve housing assembly (3) to the corresponding outer peripheral side of the first annular groove (2d2) and forms a gap with the first annular groove (2d2). This gap constitutes a pressure relief channel. High-pressure liquid enters the interior of the hollow connecting pipe (2d) through the pressure relief channel and the end opening of the hollow connecting pipe (2d) in sequence, and then exits through the through hole (2d1), the liquid outlet (2c) and the pressure relief hole (1c), so as to realize the synchronous insertion of the external fork and the system pressure relief.

2. The quick connector according to claim 1, characterized in that: The inner sleeve (2) has two spaced first sealing rings (7) on its outer periphery of the sealing section (2a). A second annular groove (2e) extending circumferentially is formed between the two first sealing rings (7). The inner sleeve (2) has multiple liquid outlets (2c). Each liquid outlet (2c) extends radially to the inner wall of the inner sleeve (2) and communicates with the second annular groove (2e). The outer shell assembly (1) has multiple pressure relief holes (1c). Each pressure relief hole (1c) is connected to the second annular groove (2e).

3. The quick connector according to claim 1, characterized in that: The sealing assembly (5) further includes a sealing sleeve (5b) and a washer bracket (5c). One end of the sealing sleeve (5b) is an open end, and its inner diameter is larger than the outer diameter of the hollow connecting pipe (2d). There are two sealing elements (5a). The two sealing elements (5a) are arranged at intervals and connected to the open side of the sealing sleeve (5b), and the two sealing elements (5a) are connected to each other through the washer bracket (5c). In the non-depressurized state, the two sealing components (5a) are respectively sleeved on the outer periphery of the hollow connecting pipe (2d) located on both sides of the first annular groove (2d2); in the depressurized state, the sealing assembly (5) moves synchronously with the valve housing assembly (3), so that the sealing component (5a) is aligned with the first annular groove (2d2), and the high-pressure liquid flows sequentially through the first annular groove (2d2), the gap between the outer periphery of the hollow connecting pipe (2d) and the inner wall of the sealing sleeve (5b), the end opening of the hollow connecting pipe (2d), the through hole (2d1), the liquid outlet (2c) and the pressure relief hole (1c) to be discharged.

4. The quick connector according to claim 1, characterized in that: The valve sleeve (4b) is movably disposed within the valve housing assembly (3), and a third sealing ring (8) is provided between the outer periphery of the valve sleeve (4b) and the inner wall of the valve housing assembly (3); It also includes a second reset spring (9), which is disposed between the valve sleeve (4b) and the sealing assembly (5) and is used to drive the valve sleeve (4b) to reset after the external tool is pulled out.

5. The quick connector according to claim 1, characterized in that: The valve assembly (4) further includes a piston (4c) and a third return spring (10); the piston (4c) is built into the valve sleeve (4b) and is axially movable relative to it; The third reset spring (10) is located between the piston (4c) and the valve head (4a) and is used to drive the piston (4c) to reset. The piston (4c) is provided with a liquid passage (4c1) extending axially, and a one-way plug (4c2) is provided in the liquid passage (4c1). The one-way plug (4c2) is configured to allow liquid to flow unidirectionally from the first side near the valve head (4a) to the second side where the sealing assembly (5) is located.

6. The quick connector according to claim 1, characterized in that: The inner sleeve (2) has multiple notches (2f) at its open end, which are used to allow liquid to flow smoothly from the first inlet hole (2b) to the second inlet hole (3c1).

7. The quick connector according to claim 1, characterized in that: The valve housing assembly (3) includes a first valve housing (3e) and a second valve housing (3f), the first valve housing (3e) and the second valve housing (3f) enclosing each other to form the second cavity (3c); the first cavity (3b) is disposed on the second valve housing (3f), and the second liquid inlet (3c1) and the perforation (3d) are both disposed on the first valve housing (3e).

8. The quick connector according to claim 7, characterized in that: The housing assembly (1) includes a first housing (1d) and a second housing (1e), the first housing (1d) and the second housing (1e) are detachably connected by threads, the inlet (1a) and the pressure relief hole (1c) are provided on the first housing (1d), and the opening (1b) of the housing assembly (1) is provided on the second housing (1e); a fourth sealing ring (11) is provided between the outer periphery of the valve housing assembly (3) and the inner wall of the second housing (1e).

9. The quick connector according to claim 8, characterized in that: A connecting sleeve (12) is provided between the second outer shell (1e) and the valve housing assembly (3). The peripheral wall of the second valve housing (3f) is provided with a plurality of through conical holes (3f1), and each of the conical holes (3f1) is provided with a ball (13). The inner wall of the connecting sleeve (12) is provided with an inclined surface (12a) that cooperates with the ball (13). When the valve housing assembly (3) moves in the depressurization direction, the ball (13) disengages from the inclined surface (12a) and can move radially outward; when the external end is inserted and the valve housing assembly (3) is reset, the inclined surface (12a) of the connecting sleeve (12) squeezes the ball (13) and locks the external end in position.

10. The quick connector according to claim 1, characterized in that: The valve head (4a) has a first conical surface (4a2) formed on its outer periphery. An annular seal (14) is provided on the first conical surface (4a2). A second conical surface (3a1) adapted to the first conical surface (4a2) is formed on the communication port (3a). When the valve head (4a) is driven to return to the first cavity (3b) by the first return spring (6), the first conical surface (4a2) and the second conical surface (3a1) abut against each other to limit the excessive movement of the valve head (4a).

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