Female joint of hydraulic quick-change joint

Abstract

The invention relates to a female joint of a hydraulic quick-change joint, and aims to solve the technical problems that the female joint cannot allow a male joint to be smoothly connected after being inserted under the working pressure (250bar) due to poor structure and component design of the conventional like product, so that the operation of constructors is complicated, and the overall construction project efficiency is low. The female joint is characterized in that steel balls are arranged in steel ball holes which are formed in an orifice in one end of a clamping sleeve at the position of a joint body of the female joint at equal intervals respectively, a gasket and a sealing ring are arranged on the inner wall of the joint body, and a valve element assembly in the joint body is sleeved into the joint body through one end of a spring seat sleeve on the outer diameter of the valve element assembly; the spring seat sleeve abuts against and is limited to the inner wall end corner of the outer side of the center hole of the connector body through the middle spring, the other end of the spring seat sleeve abuts against a step hole in the inner diameter of the connector cap sleeved with the outer diameter of an orifice in the other end of the connector body through the middle spring, and the connector body and the connector cap are connected into a whole. Therefore, the male connector is allowed to be inserted under the working pressure (250bar).

Description

TECHNICAL FIELD

[0001] The invention relates to a hydraulic quick connector, and is a female connector of a hydraulic quick connector. BACKGROUND

[0002] The hydraulic quick connector is a very important element in the hydraulic system, which allows quick and easy connection or disconnection of hydraulic pipelines without using tools, while minimizing hydraulic oil leakage and air entering the system. The hydraulic quick connector is usually composed of two parts: a male head (a connector with a sharp spike) and a female head (a sleeve with a valve seat). The working pressure of the hydraulic quick connector must be greater than or equal to the maximum working pressure of the hydraulic system, commonly 250Bar, 350Bar, 420Bar, or even above 700Bar. When connecting, make sure the male and female heads are aligned, push to the bottom and rotate (if there is a locking ring) until it is locked. Before disconnecting, make sure the hydraulic system has been depressurized and the tool has been placed securely. The existing hydraulic quick connector including the male head and the female head, such as the authorized announcement number CN218625921U, authorized announcement date 2023.03.14, utility model name "quick connector with good sealing effect" disclosed in Chinese patent documents; but the structure and component design of the above product and similar products are not good, which leads to the fact that the male connector cannot be inserted into the female connector under working pressure (250bar), resulting in the objective reality problem that the construction personnel's operation is complex and the overall construction project efficiency is low. SUMMARY

[0003] To overcome the above shortcomings, the purpose of the present invention is to provide a female connector of a hydraulic quick connector to the field, which solves the technical problem that the structure and component design of the existing similar hydraulic quick connector products are not good, which leads to the fact that the female connector cannot allow the male connector to be inserted and connected smoothly under working pressure (250bar), resulting in the fact that the construction personnel's operation is complex and the overall construction project efficiency is low. The purpose is achieved through the following technical solutions.

[0004] A female connector of a hydraulic quick-connect coupling has the following structural design features: A first spring groove is provided on the inner wall of the sleeve opening at one end of the female connector; a second spring groove is provided in the middle of the outer diameter of the connector body corresponding to the first spring groove; a large spring located at the second spring groove extends above the second spring groove and is fixedly sealed within the spring cavity formed by the first and second spring grooves via a sleeve gasket and retaining ring at the sleeve opening at the first spring groove end; steel balls are respectively provided in equidistantly spaced steel ball holes within the opening of the sleeve opening of the connector body; steel ball grooves are provided on the upper and lower inner walls of the connector body at the steel ball locations to accommodate the steel balls when the connector body moves back and forth within the sleeve; a second gasket and a second sealing ring are provided in a protruding sealing groove on the inner wall of the connector body below the steel ball; a central hole smaller than the inner wall of the sealing groove is provided in the center of the connector body below the sealing groove; the central hole of the connector body is conical, with the diameter of the conical hole increasing symmetrically from one end of the steel ball to the other end; a valve core assembly is installed in the central hole from the other end of the connector body; the valve core assembly is connected to a spring on its outer diameter. As one end of the seat sleeve is inserted into the connector body, the spring seat sleeve is restrained by the middle spring at the inner corner of the inner wall outside the center hole of the connector body. The other end of the spring seat sleeve is restrained by the middle spring at the stepped hole in the inner diameter of the connector cap, which is inserted into the outer diameter of the other end of the connector body. The connector body and the connector cap are integrated. A head cap sealing ring is provided on the outer diameter of the connector cap. The conical head of the valve core assembly in the connector body is sealed by the valve core sealing ring in the sealing ring groove on the outer diameter, which abuts against the conical inner wall of the center hole of the connector body. The tapered surface of the outer diameter of the conical head corresponds and fits with the tapered surface of the center hole of the connector body. The channel rib at the spring seat at the other end of the valve core rod abuts against the inner hole of the inner diameter step of the spring seat sleeve, which narrows inwards at one end of the small spring at the valve core rod. The channel ribs are equidistantly positioned on the outer diameter of the spring seat. The conical head protrusion of the valve core aligns with the second sealing ring inside the connector body. The center hole of the connector body communicates with the through hole of the connector cap through the spring seat sleeve. The diameter of one end of the conical center hole of the connector body is smaller than the diameter of the symmetrical other end. Thus, the male connector corresponding to this female connector achieves rapid opening and closing of the hydraulic circuit by inserting and removing it from the female connector. The advantage of this design is that it allows the male connector to be inserted at the working pressure (250 bar), whereas the male connectors of existing conventional products must be inserted at 0 bar or residual pressure (0-50 bar).

[0005] The valve core assembly has a circular end face at the conical head protrusion of the valve core. Below the circular end face, the conical surface is an inwardly concave arc-shaped circumference. Below the arc-shaped circumference, the cylindrical surface has an outwardly increasing umbrella-shaped circumference. The groove on one side of the sealing ring groove below the umbrella-shaped circumference is higher than the groove on one side of the umbrella-shaped circumference. The outer diameter of the valve core sealing ring is at least higher than the groove on one side of the umbrella-shaped circumference. The above is a specific structural embodiment of one end of the conical head of the valve core. Air pressure can easily pass through the umbrella-shaped and arc-shaped circumferences of the valve core to impact the inner wall of the conical hole inside the connector, thereby pushing the valve core into the connector body and opening the valve core.

[0006] The steel ball at one end of the connector body is inserted into the male connector body. Simultaneously, the steel ball inside the connector body is embedded in the steel ball groove on the outer diameter of one end of the male connector body. At the same time, the outer diameter of the male connector body inside the connector body abuts against the second sealing ring and the second gasket. Another valve core assembly inside the male connector body abuts against the valve core assembly inside the connector body through the insertion orifice. The end of the valve core assembly at the spring seat inside the male connector body is limited by a retaining ring on the inner wall of the male connector body. Due to the 250 bar hydraulic oil pressure, the conical head at one end of the valve core assembly inside the male connector body remains extended beyond the orifice in the initial state. Simultaneously, the conical head of the valve core is limited to the inner wall of the orifice of the male connector body, and the valve core sealing ring at the conical head of the valve core inside the male connector body abuts against the inner wall of the conical part of the orifice for sealing.

[0007] The male connector body allows insertion into the orifice of the connector body at a working pressure of 250 bar.

[0008] The orifice diameter at one end of the valve core assembly of the connector body is the same as the orifice diameter at one end of the other valve core assembly of the male connector body. The orifice diameter at the other end of the male connector body increases radially outward from the inner diameter of the valve core assembly, and the increased orifice diameter at this end of the male connector body is larger than the diameter of the through hole in the connector cap. This structure allows air to be further compressed after entering at one end, then passes through the channels of the two valve core assemblies, and finally exits through the through hole of the connector cap. At the same time, it facilitates the opening of the channels of the two valve cores by the internal air pressure.

[0009] The end of the channel rib at the spring seat of the valve core assembly is fan-shaped and enlarged, with a notch abutting against the inner hole at the step of the inner wall of the spring seat sleeve.

[0010] At least one inner sealing groove is provided on the inner wall of the connector body at the outer diameter of the spring seat sleeve, and an inner sealing gasket and an inner sealing ring are provided in the inner sealing groove of the connector body.

[0011] The outer diameter of the ferrule is fixed with a plastic sleeve. The plastic sleeve is limited to the outer diameter of the ferrule opening and is integrated with the ferrule. The outer diameter of the plastic sleeve is symmetrically provided with flat key surfaces on both sides, and a lug is provided on the outer diameter side between the flat key surfaces to facilitate pushing.

[0012] The connector body and connector cap are connected as one piece by internal and external threads, and the outer diameter of the connector cap is provided with an external hexagon. This facilitates the adjustment of the spring force by rotating the head cap.

[0013] One end of the middle spring is fitted into and confined within the stepped groove on the outer diameter of the spring end opening of the spring seat sleeve, while the other end of the middle spring abuts against the outside of the through hole of the connector cap inside the connector body at the connection between the connector body and the connector cap.

[0014] The present invention has a reasonable structural design, is easy to assemble and use, and has good sealing and stability. In particular, the male connector allows the female connector to be inserted under working pressure (250 bar). It is suitable for use as the female connector of hydraulic quick-change connectors, as well as for structural improvements of similar products. Attached Figure Description

[0015] Figure 1 This is an exploded structural diagram of the present invention.

[0016] Figure 2 yes Figure 1 A schematic diagram of the assembled three-dimensional structure.

[0017] Figure 3 yes Figure 2 A top view of the steel ball structure is shown in the figure, with AA and BB sections shown.

[0018] Figure 4 yes Figure 3 A schematic diagram of the AA cross-sectional structure.

[0019] Figure 5 yes Figure 3 Schematic diagram of the BB cross-section structure.

[0020] Figure 6 yes Figure 1 A magnified schematic diagram of the valve core assembly.

[0021] Figure 7 yes Figure 6 A schematic diagram of the exploded structure of the valve core assembly.

[0022] Figure 8 yes Figure 4 The diagram shows the assembly cross-sectional structure, with the male connector just inserted into the female connector.

[0023] Figure 9 yes Figure 8 A cross-sectional view of the male connector after it has been inserted into the female connector and is in a balanced state.

[0024] Figure 10 yes Figure 9 A schematic diagram of the three-dimensional structure.

[0025] Attached figures and their names: 1. Plastic sleeve, 2. Compression sleeve, 3. Large spring, 4. Steel ball, 5. First gasket, 6. First sealing ring, 7. Connector body, 8. Valve core assembly, 801. Sealing ring, 802. Valve core, 8021. Umbrella-shaped circumference, 803. Small spring, 804. Spring seat, 8041. Channel rib, 9. Spring seat sleeve, 10. Middle spring, 11. Second gasket, 12. Second sealing ring, 13. Compression sleeve gasket, 14. Snap ring, 15. Connector cap, 16. Head cap sealing ring, 17. Male connector body, 18. Snap ring. Implementation

[0026] The structure and use of the present invention will now be further described with reference to the accompanying drawings. Figures 1-10 As shown, the inner wall of the sleeve 2 at one end of the female connector has a first spring groove, and the middle of the outer diameter of the connector body 7 corresponding to the first spring groove has a second spring groove. The large spring 3 located at the second spring groove protrudes from the second spring groove and is fixedly sealed in the spring cavity formed by the sleeve gasket 13 and the retaining ring 14 at the sleeve opening of the sleeve at the first spring groove. Steel balls 4 are respectively provided in the steel ball holes equidistantly arranged in the opening of the sleeve at one end of the connector body. The upper and lower inner walls of the connector body at the steel ball location are respectively provided with connecting... The head body has a ball groove that accommodates steel balls when it moves back and forth within the ferrule. A second gasket 11 and a second sealing ring 12 are located in a raised sealing groove on the inner wall of the connector body below the steel balls. A central hole, smaller than the inner wall of the sealing groove, is located in the center of the connector body below the sealing groove. This central hole is conical, with its diameter increasing symmetrically from one end of the steel ball towards the other. A valve core assembly 8 is installed in the central hole, inserted through the other end of the connector body. Simultaneously, the valve core assembly is fitted into the connector body through a spring seat 9 on the outer diameter of the valve core assembly. The spring seat is positioned at the inner corner of the outer side of the center hole of the connector body by the middle spring 10. The other end of the spring seat abuts against the stepped hole in the inner diameter of the connector cap 15, which is fitted into the outer diameter of the other end of the connector body, through the middle spring. The connector body and the connector cap are integrated. A head cap sealing ring 16 is provided on the outer diameter of the connector cap. The valve core 802 of the valve core assembly in the connector body has a tapered head at one end, which abuts against the tapered inner wall of the center hole of the connector body through the valve core sealing ring 801 in the sealing ring groove on the outer diameter. The outer diameter of the tapered head of the valve core is tapered. The conical surface at the center hole of the connector body corresponds and fits. The channel rib 8041 at the spring seat 804 at the other end of the valve core rod abuts against the inner hole at the inner diameter step of the spring seat sleeve where the small spring 803 at the rod of the valve core narrows inward. The channel ribs are equidistantly set on the outer diameter of the spring seat. The conical head protrusion of the valve core is aligned with the second sealing ring in the connector body. The center hole of the connector body is connected to the through hole of the connector cap through the spring seat sleeve. The diameter of one end of the conical center hole of the connector body is smaller than the diameter of the other symmetrical end.

[0027] The valve core assembly described above has a circular end face at the conical head protrusion of the valve core. Below the circular end face, the conical surface is an inwardly concave arc-shaped circumference. Below the arc-shaped circumference, the cylindrical surface has an outwardly increasing umbrella-shaped circumference 8021. The groove on the other side of the sealing ring groove below the umbrella-shaped circumference is higher than the groove on one side of the umbrella-shaped circumference. The outer diameter of the valve core sealing ring is at least higher than the groove on one side of the umbrella-shaped circumference. The end of the channel rib at the spring seat of the valve core assembly is fan-shaped and has a notch that abuts against the inner orifice of the step on the inner wall of the spring seat sleeve. One end of the steel ball in the connector body is inserted into the male connector body 17. The steel ball in the connector body is embedded in the steel ball groove on the outer diameter of one end of the male connector body. At the same time, the outer diameter of the male connector body in the connector body abuts and seals against the second sealing ring and the second gasket. Another valve core assembly in the male connector body abuts against the valve core assembly in the connector body through the insertion orifice. The end of the valve core assembly in the male connector body is limited to the retaining ring 18 on the inner wall of the male connector body. Due to the hydraulic oil pressure of 250 bar, the conical head of the valve core assembly in the male connector body is kept protruding from the orifice in the initial state. The conical head of the valve core is limited to the inner wall of the orifice of the male connector body. At the same time, the valve core sealing ring at the conical head of the valve core in the male connector body abuts and seals against the inner wall of the conical part of the orifice. The diameter of one end of the valve core assembly of the connector body is the same as the diameter of one end of the valve core assembly of the male connector body. The diameter of the other end of the male connector body increases radially outward from the valve core assembly of the male connector body. The increased diameter of this end of the male connector body is larger than the diameter of the through hole in the connector cap.

[0028] The inner wall of the connector body at the outer diameter of the aforementioned spring seat sleeve is provided with at least one inner sealing groove, and an inner sealing gasket and an inner sealing ring are provided in the inner sealing groove of the connector body. A plastic sleeve 1 is fixedly attached to the outer diameter of the ferrule, and the plastic sleeve is limited to the outer diameter of the ferrule hole. The plastic sleeve is integrally connected to the ferrule, and symmetrical flat key surfaces are provided on both sides of the outer diameter of the plastic sleeve. A lug is provided on one side of the outer diameter between the flat key surfaces to facilitate pushing. The connector body and the connector cap are integrally connected by internal and external threads, and the outer diameter of the connector cap has an external hexagonal shape. One end of the middle spring is fitted into and limited to the stepped groove on the outer diameter of the spring end of the spring seat sleeve, and the other end of the middle spring abuts against the outside of the through hole of the connector cap inside the connector body at the connection between the connector body and the connector cap.

[0029] The working principle of this female connector is as follows: When the male connector, fully pressurized (250 bar), is inserted into the female connector, it first pushes open the valve core to the left. Then, the valve core drives the small spring, spring seat, spring seat sleeve, and middle spring to move to the left together until the steel ball locks the male connector, completing the connection. At this time, the pressure at the equipment end connected to the female connector opens, and the valve core drives the above-mentioned parts to slowly move to the right until the pressure on both sides reaches the balanced working pressure (250 bar). The valve cores of the female connector and the male connector are in a balanced state of mutual restraint, the flow channel is unobstructed, and power transmission is realized. That is, the male connector body can be inserted into the orifice of the connector body under working pressure (250 bar). When disconnecting, the user needs to release the pressure on the male and female connectors as with conventional products, and then press down on the plastic sleeve. The male and female connectors will automatically disconnect. Figure 9 The male and female connectors shown are inserted together in a balanced state and as follows: Figure 8 The state shown is when they are just inserted together, as follows: Figure 8 As shown, when the male connector is inserted into the female connector body under a working pressure of 250 bar, the valve core of the valve core assembly is held in place by the 250 bar pressure, thus being pushed to the port. In this state, the steel ball of the female connector and the steel ball groove (external retaining groove) of the male connector are locked together, forming a connection. Figure 9 As shown, the equipment at the port of the female connector starts working, the engine starts, and it also provides a pressure of 250 bar. Therefore, the valve core and other corresponding parts at the valve core assembly of the female connector move to the right, and the internal liquid passage reaches a balance.

[0030] The above description is intended to illustrate the technical means of the present invention and is not intended to limit the scope of the invention. Any obvious improvements or substitutions made to the present invention by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of the present invention.

Claims

1. A female connector for a hydraulic quick-connect coupling, characterized in that... The inner wall of the sleeve (2) at one end of the female connector is provided with a first spring groove. The middle of the outer diameter of the connector body (7) corresponding to the first spring groove is provided with a second spring groove. The large spring (3) set at the second spring groove is higher than the second spring groove and is fixed and sealed in the spring cavity formed by the sleeve gasket (13) and the retaining ring (14) at the sleeve opening of the sleeve at one end of the first spring groove. Steel balls (4) are respectively provided in the steel ball holes equidistantly arranged in the sleeve opening of the connector body. The upper and lower inner walls of the connector body at the steel ball are respectively provided with The connector body has a ball groove that accommodates the steel ball when it moves back and forth in the ferrule. A second gasket (11) and a second sealing ring (12) are provided in the sealing groove protruding on the inner wall of the connector body below the steel ball. A central hole smaller than the inner wall of the sealing groove is provided in the center of the connector body below the sealing groove. The central hole of the connector body is conical. The diameter of the conical hole at the central hole of the connector body increases from one end of the steel ball to the other end symmetrically. A valve core assembly (8) is provided in the central hole and is inserted into the connector body through the spring seat (9) on the outer diameter of the valve core assembly. The spring seat is positioned at the inner corner of the outer side of the center hole of the connector body by the middle spring (10). The other end of the spring seat is abutted by the middle spring and the stepped hole at the inner diameter of the connector cap (15) that is fitted into the outer diameter of the other end of the connector body. The connector body and the connector cap are integrated. The outer diameter of the connector cap is provided with a head cap sealing ring (16). The conical head of the valve core (802) of the valve core assembly in the connector body is sealed by the valve core sealing ring (801) in the sealing ring groove at the outer diameter and the conical inner wall at the center hole of the connector body. The outer diameter tapered surface corresponds to and fits with the tapered surface at the center hole of the connector body. The channel rib (8041) at the spring seat (804) at the end of the rod of the valve core abuts against the inner hole at the inner diameter step of the spring seat sleeve, which is narrowed inward at one end of the spring sleeve, through the small spring (803) at the rod of the valve core. The channel ribs are equidistantly arranged on the outer diameter of the spring seat. The tapered head protrusion of the valve core is aligned with the second sealing ring in the connector body. The center hole of the connector body is connected to the through hole of the connector cap through the spring seat sleeve. The diameter of one end of the tapered center hole of the connector body is smaller than the diameter of the other symmetrical end hole.

2. The female connector of the hydraulic quick-connect coupling according to claim 1, characterized in that... The valve core assembly (8) has a circular end face at the conical head protrusion of the valve core (802). The conical surface below the circular end face is an inwardly concave arc-shaped circumferential surface. The cylindrical surface below the arc-shaped circumferential surface has an umbrella-shaped circumferential surface (8021) that increases outwardly at an angle. The groove on the other side of the sealing ring groove below the umbrella-shaped circumferential surface is higher than the groove on one side of the umbrella-shaped circumferential surface. The outer diameter of the valve core sealing ring (801) is at least higher than the groove on one side of the umbrella-shaped circumferential surface.

3. The female connector of the hydraulic quick-connect coupling according to claim 2, characterized in that... The steel ball (4) of the connector body (7) is inserted into the male connector body (17) through one end orifice. The steel ball in the connector body is embedded in the steel ball groove of the outer diameter of one end of the male connector body. At the same time, the outer diameter of the male connector body in the connector body abuts and seals against the second sealing ring (12) and the second gasket (11). Another valve core assembly (8) in the male connector body abuts against the valve core assembly in the connector body through the orifice of the insertion. The end of the spring seat (804) of the valve core assembly in the male connector body is limited to the snap ring (18) on the inner wall of the male connector body. Due to the action of 250 bar hydraulic oil pressure, the conical head of the valve core (802) in the male connector body remains in the state of protruding from the orifice in the initial state. The conical head of the valve core is limited to the inner wall of the orifice of the male connector body. At the same time, the valve core sealing ring (801) at the conical head of the valve core in the male connector body abuts and seals against the inner wall of the conical part of the orifice.

4. The female connector of the hydraulic quick-connect coupling according to claim 3, characterized in that... The male connector body (17) allows insertion into the orifice of the connector body (7) at a working pressure of 250 bar.

5. The female connector of the hydraulic quick-connect coupling according to claim 4, characterized in that... The diameter of one end of the valve core assembly (8) of the connector body (7) is the same as the diameter of one end of the valve core assembly of the male connector body (17). The diameter of the other end of the male connector body increases radially outward from the valve core assembly of the male connector body. The increased diameter of this end of the male connector body is greater than the diameter of the through hole in the connector cap (15).

6. The female connector of the hydraulic quick-connect coupling according to claim 1, characterized in that... The end of the channel rib (8041) at the spring seat (804) of the valve core assembly (8) is fan-shaped and enlarged, with a notch abutting against the inner side opening of the step on the inner wall of the spring seat sleeve (9).

7. The female connector of the hydraulic quick-connect coupling according to claim 1, characterized in that... At least one inner sealing groove is provided on the inner wall of the connector body (7) on the outer diameter of the spring seat sleeve (9), and an inner sealing gasket and an inner sealing ring are provided in the inner sealing groove of the connector body.

8. The female connector of the hydraulic quick-connect coupling according to claim 1, characterized in that... The outer diameter of the sleeve (2) is fixed with a plastic sleeve (1). The plastic sleeve is limited to the outer diameter of the sleeve hole on one side. At the same time, the plastic sleeve is connected to the sleeve as a whole. The outer diameter of the plastic sleeve is symmetrically provided with flat key surfaces on both sides. The outer diameter side between the flat key surfaces is provided with a lug for easy pushing.

9. The female connector of the hydraulic quick-connect coupling according to claim 1, characterized in that... The connector body (7) and the connector cap (15) are connected as one unit by internal and external threads, and the outer diameter of the connector cap is provided with an external hexagon.

10. The female connector of the hydraulic quick-connect coupling according to claim 1, characterized in that... One end of the middle spring (10) is fitted into and confined in the stepped groove of the outer diameter of the spring end sleeve of the spring seat sleeve (9), and the other end of the middle spring abuts against the outside of the through hole of the connector cap inside the connector body (7) at the connection between the connector body (7) and the connector cap (15).

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