A female connector with a triangular valve tongue structure and a dry quick connector suitable for cryogenic fluids

Abstract

This invention discloses a female connector and a dry quick connector with a triangular valve tongue structure suitable for cryogenic fluids. The female connector includes a female valve core, which is a triangular structure composed of a first valve tongue, a second valve tongue, and a third valve tongue; an axial valve seat, sleeved on the female valve core, the female valve core being axially movable relative to the axial valve seat, the axial valve seat having a plurality of circumferentially arranged limiting blocks; a rotating valve housing, having a plurality of circumferentially arranged limiting guide wheels, a spring being provided between the rotating valve housing and the axial valve seat, the spring being at maximum compression when the limiting blocks are in phase with the limiting guide wheels; and a fixed valve housing, sleeved on the rotating valve housing, the rotating valve housing being rotatable relative to the fixed valve housing. In this invention, the female valve core adopts a triangular valve tongue structure, which has reliable rigidity, ensuring that the valve tongue of the dry quick connector is not easily affected by repeated torsional deformation after multiple operations, thus maintaining the seal.

Description

Technical Field

[0001] This invention relates to the field of quick coupling technology, and further to a female coupling with a triangular valve tongue structure suitable for cryogenic fluids and a dry quick coupling. Background Technology

[0002] In the refueling, loading, and unloading of cryogenic fluids, dry quick couplings are typically used to quickly connect rigid pipes and flexible hoses to improve transport efficiency. Because cryogenic fluids have low boiling points, they evaporate rapidly upon leakage. Some fluids, such as liquefied natural gas and liquid hydrogen, are flammable and explosive, posing significant safety hazards after leakage. This places high demands on the reliability of the cryogenic seal of dry quick couplings. Current technologies do not offer a satisfactory solution for the cryogenic sealing of dry quick couplings; most are designed for room-temperature fluids and cannot guarantee their application at low temperatures. Furthermore, many dry quick couplings use a single-piece valve tongue design, which is prone to deformation due to torsion after prolonged use, affecting the service life of the dry quick coupling.

[0003] Therefore, it is necessary to design a female connector with a triangular valve tongue structure and a dry quick connector suitable for cryogenic fluids to solve the above problems. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a female connector and a dry quick connector with a triangular valve tongue structure suitable for cryogenic fluids. The female connector valve core adopts a triangular valve tongue structure, which has reliable rigidity and can ensure that the valve tongue of the dry quick connector is not easily affected by repeated torsional deformation after multiple operations, thus ensuring a good seal.

[0005] To achieve the above objectives, the present invention provides a female connector with a triangular valve tongue structure suitable for cryogenic fluids, comprising:

[0006] The female valve core is a triangular structure composed of a first valve tongue, a second valve tongue, and a third valve tongue.

[0007] An axial valve seat is sleeved on the female valve core, the female valve core is axially movable relative to the axial valve seat, and the axial valve seat is provided with a plurality of circumferentially arranged limiting blocks.

[0008] A rotating valve housing is provided with a plurality of circumferentially arranged limiting guide wheels. A spring is provided between the rotating valve housing and the axial valve seat. The spring is subjected to maximum compression when the limiting block and the limiting guide wheel are in phase.

[0009] A fixed valve housing is sleeved on the rotating valve housing, and the rotating valve housing is rotatable relative to the fixed valve housing.

[0010] In some embodiments, the first valve tongue, the second valve tongue, and the third valve tongue are respectively provided with roller pins, and each roller pin is connected to a roller;

[0011] The rotating valve housing is provided with three spiral grooves, and each roller is adapted to be disposed in the corresponding spiral groove. When the rotating valve housing rotates, the roller moves in the spiral groove, so that the female valve core moves axially relative to the axial valve seat.

[0012] In some embodiments, a double-row ball bearing assembly and a bushing are provided between the rotating valve housing and the fixed valve housing, the double-row ball bearing assembly and the bushing being used to enable the rotating valve housing and the fixed valve housing to rotate relative to each other; wherein, the bushing is made of modified PTFE material that can withstand the low temperature of liquid nitrogen.

[0013] In some embodiments, the rotary valve housing is provided with staggered vent holes and inflation holes, the vent holes and inflation holes are respectively connected to the rolling bearing double track space of the double-row ball assembly, and the vent holes and inflation holes are respectively provided with detachably connected screw plugs.

[0014] During assembly, nitrogen gas is used to purge the air from the double track space of the rolling bearing to ensure that the nitrogen gas fills the double track space of the rolling bearing. After purging, the screw plug is used to seal the exhaust port and the inflation port.

[0015] In some implementations, it also includes:

[0016] The first sealing ring of the female head is disposed on the side of the female head valve core and is used to ensure the seal between the female head valve core and the axial valve seat to close the passage when not connected;

[0017] And / or, a second sealing ring for the female head, which is disposed on the side of the axial valve seat and is used to form a radial seal with the inner hole of the male head when the male and female heads are connected.

[0018] In some implementations, it also includes:

[0019] And / or, a third sealing ring and a fourth sealing ring for the female head, wherein the third sealing ring and the fourth sealing ring for the female head are respectively located between the axial valve seat and the rotating valve housing, for the purpose of providing a double-layer sealing effect;

[0020] And / or, a fifth sealing ring and a sixth sealing ring for the female head, wherein the fifth sealing ring and the sixth sealing ring for the female head are respectively disposed on both sides of the double-row ball assembly, for achieving radial and axial sealing between the rotating valve housing and the fixed valve housing.

[0021] In some embodiments, the first sealing ring of the female head is a plug seal ring;

[0022] And / or, the second sealing ring of the female head is a plug seal ring;

[0023] And / or, the third sealing ring of the female head is a plug seal ring;

[0024] And / or, the fourth sealing ring of the female head is a plug seal ring;

[0025] And / or, the fifth sealing ring of the female head is a plug seal ring;

[0026] And / or, the sixth sealing ring of the female head is a plug seal ring.

[0027] In some embodiments, the rotary valve housing is provided with a plurality of handwheels arranged circumferentially, and a force-applying rod is detachably installed on the handwheels. Rotating the force-applying rod will drive the handwheels and the rotary valve housing connected thereto to rotate synchronously.

[0028] According to another aspect of the present invention, the present invention further provides a dry quick coupling, comprising a female coupling with a triangular valve tongue structure suitable for cryogenic fluids as described in any one of the above, and further comprising:

[0029] A male connector is adapted to connect with a female connector having a triangular valve tongue structure suitable for cryogenic fluids.

[0030] In some embodiments, the male connector includes:

[0031] The male valve body has a guide groove and a limiting ring groove at one end, which are used to adapt and connect with the limiting block of the female connector. The other end of the male valve body has a male flange, which is used to connect with a cryogenic fluid pipeline.

[0032] A male sealing gland is disposed in the male valve body and located at the end of the male valve body away from the male flange. A second male sealing ring is also disposed on the male valve body. The second male sealing ring is used to achieve axial sealing when the male connector and the female connector are connected.

[0033] A male sealing spring seat is disposed in the male valve body. A male first sealing ring is provided between the male sealing spring seat and the male sealing gland and is fixed by a countersunk screw to achieve radial sealing.

[0034] A male positioning ring, the inner hole of which is clearance-fitted with the male valve stem of the male sealing spring seat, so that the male valve stem of the male sealing spring seat can move axially along the male positioning ring;

[0035] A male spring is sleeved on the male valve stem and located between the male positioning ring and the male sealing spring seat, and is capable of axial extension and retraction.

[0036] Compared with the prior art, the female connector and dry quick connector with triangular valve tongue structure for cryogenic fluids provided by the present invention have the following advantages:

[0037] 1. The low-temperature fluid suitable female connector with triangular valve tongue structure provided by the present invention has a female valve core with triangular valve tongue structure, which ensures that the female valve core is subjected to uniform force during torsion, is not easily deformed, has reliable rigidity, and can ensure that the valve tongue of the dry quick connector is not easily affected by repeated torsion deformation after multiple operations.

[0038] 2. The dry quick connector provided by the present invention uses a double-row ball bearing assembly to realize the rolling bearing support and relative rotation function of the rotating valve body of the female connector, which enhances the load-bearing capacity of the external valve body and is not easy to jam; the double-row ball bearing assembly is sealed with nitrogen to prevent frost from forming on the relatively rotating parts inside the structure, which would hinder the rotation of the structure and make it less likely to jam between the rotating valve body and the fixed valve body.

[0039] 3. The dry quick coupling provided by the present invention uses a bushing supported by modified PTFE material, which is set between the rotating valve shell and the fixed valve shell of the female coupling. By utilizing its anti-friction properties, it can prevent the rotating valve shell and the fixed valve shell from directly contacting each other, reduce rotational resistance, delay wear, and reduce equipment material consumption.

[0040] 4. The dry quick coupling provided by the present invention is provided with multiple PVC seal rings. By utilizing the excellent low-temperature sealing performance of PVC seals, it is ensured that there is no leakage when the male and female couplings are not connected. The dynamic sealing surface is provided with axial and radial seals to ensure that there is no low-temperature liquid leakage when connected. Attached Figure Description

[0041] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0042] Figure 1 This is a cross-sectional view of the female connector according to a preferred embodiment of the present invention;

[0043] Figure 2 This is a right view of the female connector according to a preferred embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of the rotating valve housing according to a preferred embodiment of the present invention;

[0045] Figure 4 This is a cross-sectional view of the male connector according to a preferred embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the structure of the male connector according to a preferred embodiment of the present invention;

[0047] Figure 6 This is a cross-sectional view of the dry quick connector in the preferred embodiment of the present invention in the connected state.

[0048] Explanation of icon numbers:

[0049] Male sealing gland 1, male first sealing ring 11, countersunk screw 12, male sealing spring seat 2, male valve stem 21, male spring 3, male valve body 4, male positioning ring 5, male second sealing ring 51, guide groove 52, limit ring groove 53, male flange 54, female valve core 6, first valve tongue 61, second valve tongue 62, third valve tongue 63, roller pin 64, roller 641, female first sealing ring 65, axial valve seat 7, spring 71, female second sealing ring 72, limit block 73, female third sealing ring 74, female fourth sealing ring 75, rotating valve body 8, limit guide wheel 81, double row ball assembly 82, bushing 83, female fifth sealing ring 84, female sixth sealing ring 85, spiral groove 86, handwheel 87, force lever 871, fixed valve body 9. Detailed Implementation

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0051] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0052] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0053] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0055] In one embodiment, refer to the appendix to the specification. Figures 1 to 3 The present invention provides a female connector with a triangular valve tongue structure suitable for cryogenic fluids, comprising: a female valve core 6, an axial valve seat 7, a rotating valve housing 8, and a fixed valve housing 9. The female valve core 6 is a triangular structure composed of a first valve tongue 61, a second valve tongue 62, and a third valve tongue 63. The axial valve seat 7 is sleeved on the female valve core 6, and the female valve core 6 can move axially relative to the axial valve seat 7. The axial valve seat 7 is provided with a plurality of circumferentially arranged limiting blocks 73. The rotating valve housing 8 is provided with a plurality of circumferentially arranged limiting guide wheels 81. A spring 71 is provided between the rotating valve housing 8 and the axial valve seat 7. The spring 71 is under maximum pressure when the limiting blocks 73 and the limiting guide wheels 81 are in phase. The fixed valve housing 9 is sleeved on the rotating valve housing 8, and the rotating valve housing 8 can rotate relative to the fixed valve housing 9.

[0056] In this embodiment, the female valve core 6 adopts a triangular valve tongue structure, which ensures that the female valve core 6 is subjected to uniform force during torsion, is not easily deformed, and has reliable rigidity. This ensures that the valve tongue of the dry quick connector is not easily affected by repeated torsion deformation after multiple operations, thus ensuring the seal is not affected.

[0057] In one embodiment, refer to the appendix to the specification. Figures 1 to 3 Each of the first valve tongue 61, the second valve tongue 62, and the third valve tongue 63 is provided with a roller pin 64, and a roller 641 is connected to each roller pin 64. The rotating valve housing 8 is provided with three spiral grooves 86, each spiral groove having a smooth transition section at both ends. Each roller 641 is adapted to be set in the corresponding spiral groove. When the rotating valve housing 8 rotates, the roller 641 moves in the spiral groove, causing the female valve core 6 to move axially relative to the axial valve seat 7.

[0058] A double-row ball assembly 82 and a bushing 83 are provided between the rotating valve housing 8 and the fixed valve housing 9. The double-row ball assembly 82 and the bushing 83 are used to realize the mutual rotation of the rotating valve housing 8 and the fixed valve housing 9. The double-row ball assembly 82 includes several rolling steel balls, and the bushing 83 is made of modified PTFE material that can withstand the low temperature of liquid nitrogen.

[0059] The rotating valve housing 8 is provided with staggered vent holes and inflation holes, which are respectively connected to the double-track space of the rolling bearing of the double-row ball assembly 82. Removable plugs are provided at the vent holes and inflation holes. During assembly, nitrogen is used to purge the air from the double-track space of the rolling bearing to ensure that the space is completely filled with nitrogen. After purging, the vent holes and inflation holes are sealed with plugs.

[0060] In this embodiment, the rotating valve housing 8 uses a double-row ball bearing assembly 82 to achieve rolling bearing support and relative rotation function, enhancing the load-bearing capacity of the external valve body and preventing jamming. The double-row ball bearing assembly 82 is sealed with nitrogen to prevent frost formation on the relatively rotating parts inside the structure, which would hinder the rotation of the structure and make it less likely for the rotating valve housing 8 and the fixed valve housing 9 to jam. A bushing 83 supported by modified PTFE material is set between the rotating valve housing 8 and the fixed valve housing 9. Utilizing its anti-friction properties, it can prevent direct contact between the rotating valve housing 8 and the fixed valve housing 9, reduce rotational resistance, delay wear, and reduce material consumption of the equipment.

[0061] Furthermore, the female connector with a triangular valve tongue also includes:

[0062] The first sealing ring 65 of the female head is disposed on the side of the female head valve core 6 and is used to ensure the seal between the female head valve core 6 and the axial valve seat 7 to close the passage when not connected.

[0063] The second sealing ring 72 of the female head is disposed on the side of the axial valve seat 7 and is used to form a radial seal with the inner hole of the male head when the male and female heads are connected.

[0064] The third sealing ring 74 and the fourth sealing ring 75 of the female head are located between the axial valve seat 7 and the rotating valve body 8, respectively, and are used to play a double-layer sealing role.

[0065] The fifth sealing ring 84 and the sixth sealing ring 85 of the female head are respectively disposed on both sides of the double-row ball assembly 82 to achieve radial and axial sealing between the rotating valve housing 8 and the fixed valve housing 9.

[0066] Preferably, the first sealing ring 65, the second sealing ring 72, the third sealing ring 74, the fourth sealing ring 75, the fifth sealing ring 84, and the sixth sealing ring 85 of the female connector are all Pan-Plug seals. A Pan-Plug seal is a high-performance seal with a U-shaped Teflon core and a special spring. Appropriate spring force combined with system fluid pressure pushes the sealing lip (face) forward, gently pressing it against the sealed metal surface to create an excellent sealing effect. The spring's actuation effect overcomes slight eccentricity of the metal mating surfaces and wear of the sealing lip, thus maintaining the expected sealing performance. By setting multiple Pan-Plug seals and utilizing their excellent low-temperature sealing performance, no leakage occurs when the male and female connectors are not connected. Axial and radial seals are provided on the dynamic sealing surface to ensure no low-temperature liquid leakage during connection.

[0067] Furthermore, the rotary valve housing 8 is provided with several handwheels 87 arranged circumferentially, and the force lever 871 is detachably installed on the handwheels 87. Rotating the force lever 871 will drive the handwheels 87 and the rotary valve housing 8 connected thereto to rotate synchronously.

[0068] According to another aspect of the invention, reference is made to the appended specification. Figures 1 to 6 The present invention further provides a dry quick coupling, comprising a female coupling with a triangular valve tongue suitable for cryogenic fluids as described in any one of the above-mentioned embodiments, and further comprising a male coupling adapted to and connected to the female coupling with the triangular valve tongue. The male coupling comprises a male valve body 4, a male sealing gland 1, a male sealing spring seat 2, a male positioning ring 5, and a male spring 3. One end of the male valve body 4 is provided with a guide groove 52 and a limiting ring groove 53, which are adapted to and connected to the limiting block 73 and the limiting guide wheel 81 of the female coupling. The other end of the male valve body 4 is provided with a male flange 54, which is used to connect to a cryogenic fluid pipeline. The male sealing gland 1 is disposed inside the male valve body 4 and located at the end of the male valve body 4 away from the male flange 54. The male valve body 4 is also provided with a male second sealing ring 51, which is used to achieve axial sealing when the male coupling and the female coupling are connected. A male valve stem sealing spring seat 2 is disposed within the male valve body 4. A male first sealing ring 11 is provided between the male valve stem sealing spring seat 2 and the male sealing gland 1, and is fixed by a countersunk screw 12 to achieve radial sealing. The inner hole of the male valve stem positioning ring 5 is clearance-fitted with the male valve stem 21 of the male valve stem sealing spring seat 2, allowing the male valve stem 21 of the male valve stem sealing spring seat 2 to move axially along the male valve stem positioning ring 5. A male spring 3 is sleeved on the male valve stem 21 and located between the male valve stem positioning ring 5 and the male valve stem sealing spring seat 2, and can extend and retract axially.

[0069] In this embodiment, the dry quick connector includes a male connector and a female connector that mate with each other. The female valve core 6 is a triangular valve tongue structure designed for low-temperature sealing, making it less prone to deformation. The male connector includes a male sealing gland 1, a male sealing spring seat 2, a male spring 3, a male valve body 4, and a male positioning ring 5. The male sealing gland 1 is fixed to the male sealing spring seat 2 by countersunk screws 12, forming a sealing groove, in which a first male sealing ring 11 is provided. A second male sealing ring 51 is provided on the right end face of the male valve body 4, achieving axial sealing when the male connector and the mating female connector are connected. The male valve stem 21 on the male sealing spring seat 2 is clearance-fitted with the inner hole of the male positioning ring 5, allowing it to move axially along the male positioning ring 5. The male spring 3, located between the male positioning ring 5 and the male sealing spring seat 2, is sleeved on the male valve stem 21 and can extend and retract axially to achieve pre-tightening. The male valve body 4 is provided with a guide groove 52 and a limit ring groove 53 corresponding to the limit block 73 and the limit guide wheel 81. The male valve body 4 is connected to the cryogenic fluid pipeline through a male flange 54.

[0070] When the male connector is not connected to the female connector, the preload force of the male connector spring 3 pushes the male connector sealing spring seat 2 and the male connector sealing cap 1 connected to it onto the valve seat of the male connector valve body 4, thus closing the male connector flow channel. The male connector first sealing ring 11 forms a seal with the valve seat of the male connector valve body 4 to prevent leakage of cryogenic fluid.

[0071] The female connector includes a female valve core 6, an axial valve seat 7, a rotating valve housing 8, a fixed valve housing 9, a handwheel 87, and a lever 871. A double-row ball bearing assembly 82 and a bushing 83 are installed between the rotating valve housing 8 and the fixed valve housing 9, allowing them to rotate relative to each other. The bushing 83 is made of modified PTFE material. Three helical grooves 86 are provided on the rotating valve housing 8, and several limiting guide wheels 81 are evenly arranged circumferentially. A ring-shaped spring 71 is installed between the rotating valve housing 8 and the axial valve seat 7. Several limiting guide wheels 81 are arranged circumferentially on the rotating valve housing 8, and several limiting blocks 73 are arranged circumferentially on the end face of the axial valve seat 7. When the male and female connectors are not connected, the limiting guide wheels 81 and limiting blocks 73 are in phase, and the axial valve seat 7 pre-tightens the spring 71 under pressure. The female valve core 6 is located inside the axial valve seat 7, and the female valve core 6 can move axially relative to the axial valve seat 7. The female valve core 6 is a triangular structure composed of a first valve tongue 61, a second valve tongue 62, and a third valve tongue 63. Each valve tongue is fixed with a roller pin 64, and a roller 641 is connected to the roller pin 64. The roller 641 and the spiral groove 86 are in clearance fit. A handwheel 87 is installed on the rotating valve housing 8. The handwheel 87 has circumferentially arranged force-applying rod insertion holes. The force-applying rod 871 drives the rotating valve housing 8 to rotate together through the handwheel 87. When the rotating valve housing 8 rotates, the spiral groove 86 inside it drives the roller 641 to achieve axial movement of the female valve core 6.

[0072] When the female connector is not connected to the male connector, the roller pin 64 and roller 641 connected to the valve tongue are located at the starting point of the spiral groove 86 on the rotating valve housing 8, and the position of the female valve core 6 does not exceed the end face of the axial valve seat 7, thus closing the internal flow channel of the female valve core. At this time, the limiting guide wheel 81 and the limiting block 73 on the rotating valve housing 8 are in phase, blocking the limiting block 73 and compressing the spring 71 on the axial valve seat 7 connected to it. A first sealing ring 65 is installed on the side of the female valve core 6 to ensure the sealing between the female valve core 6 and the axial valve seat 7. The third sealing ring 74 and the fourth sealing ring 75 of the female valve core can seal the gap between the axial valve seat 7 and the rotating valve housing 8. The double-row ball assembly 82 has a fifth sealing ring 84 and a sixth sealing ring 85 on both sides, which serve to seal the gap between the rotating valve housing 8 and the fixed valve housing 9.

[0073] When connecting the male and female connectors, align the limiting guide wheel 81 and limiting block 73 of the female connector with the guide groove 52 on the male connector, allowing the limiting guide wheel 81 to pass through the guide groove 52 and enter the limiting ring groove 53, while the limiting block 73 is precisely positioned within the guide groove 52. Rotate the force rod 871 to make the limiting guide wheel 81 rotate within the limiting ring groove 53, causing the limiting guide wheel 81 to move away from the front of the limiting block 73. The limiting block 73 is no longer subject to resistance, and the axial valve seat 7 pops out under the action of the spring 71, its end face tightly pressing against the second sealing ring 51 of the male connector. The second sealing ring 72 of the female connector, located on the side of the axial valve seat 7, forms a radial seal to ensure no liquid leakage after connection. When the lever 871 is rotated, the spiral groove 86 on the rotating valve housing 8 rotates, pushing the roller pin 64, roller 641 and female valve core 6 forward and overcoming the clamping force of the male spring 3, causing the male sealing cover 1, male sealing spring seat 2 and male valve stem 21 to retract, thereby opening the flow channel.

[0074] During separation, the force-applying rod 871 rotates in the opposite direction, and the spiral groove 86 also rotates in the opposite direction. The female valve core 6 moves backward, and the male sealing spring seat 2 and the male sealing gland 1 gradually reset under the action of the male spring 3, eventually falling onto the valve seat of the male valve body 4. After the female valve core 6 returns to its original position, the limiting guide wheel 81 and the limiting block 73 also return to their original positions.

[0075] In the above embodiments, all sealing surfaces can be processed using a roll-hardening surface treatment to improve the hardness of the sealing surface, reduce surface roughness, and ensure the reliability of the seal. All sealing rings used are Pan-Sea sealing rings, which are suitable for low-temperature environments and have stable performance. All rigid structures are made of 316L low-temperature resistant stainless steel, which is cold-resistant, high-strength, and structurally reliable. Safety margins are incorporated into the structural design to ensure structural reliability. The dimensions of the male connector guide groove can be matched with the dimensions of the female connector limiting guide wheel and limiting block to achieve guidance and positioning, and the dimensions of the male connector limiting ring groove can be matched with the dimensions of the female connector limiting guide wheel.

[0076] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0077] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dry-type quick coupling, characterized in that, This includes a female connector with a triangular valve tongue structure suitable for cryogenic fluids and a male connector adapted to connect with the female connector, wherein the female connector includes: The female valve core is a triangular structure composed of a first valve tongue, a second valve tongue, and a third valve tongue. An axial valve seat is sleeved on the female valve core, the female valve core is axially movable relative to the axial valve seat, and the axial valve seat is provided with a plurality of circumferentially arranged limiting blocks. A rotating valve housing is provided with a plurality of circumferentially arranged limiting guide wheels. A spring is provided between the rotating valve housing and the axial valve seat. The spring is subjected to maximum compression when the limiting block and the limiting guide wheel are in phase. A fixed valve housing is sleeved on the rotating valve housing, and the rotating valve housing is rotatable relative to the fixed valve housing; The first valve tongue, the second valve tongue and the third valve tongue are respectively provided with roller pins, and each roller pin is connected to a roller. The rotating valve housing is provided with three spiral grooves, and each roller is adapted to be disposed in the corresponding spiral groove. When the rotating valve housing rotates, the roller moves in the spiral groove, so that the female valve core moves axially relative to the axial valve seat. One end of the male connector is provided with a guide groove and a limiting ring groove, which are used to adapt and connect with the limiting block and limiting guide wheel of the female connector.

2. The dry quick coupling according to claim 1, characterized in that, A double-row ball bearing assembly and a bushing are provided between the rotating valve housing and the fixed valve housing. The double-row ball bearing assembly and the bushing are used to enable the rotating valve housing and the fixed valve housing to rotate relative to each other. The bushing is made of modified PTFE material that can withstand the low temperature of liquid nitrogen.

3. The dry quick coupling according to claim 2, characterized in that, The rotary valve housing is provided with staggered exhaust holes and inflation holes. The exhaust holes and inflation holes are respectively connected to the double track space of the rolling bearing of the double-row ball assembly. The exhaust holes and inflation holes are respectively provided with detachable screw plugs. During assembly, nitrogen gas is used to purge the air from the double track space of the rolling bearing to ensure that the nitrogen gas fills the double track space of the rolling bearing. After purging, the screw plug is used to seal the exhaust port and the inflation port.

4. The dry quick coupling according to claim 3, characterized in that, Also includes: The first sealing ring of the female head is disposed on the side of the female head valve core and is used to ensure the seal between the female head valve core and the axial valve seat to close the passage when not connected; And / or, a second sealing ring for the female head, which is disposed on the side of the axial valve seat and is used to form a radial seal with the inner hole of the male head when the male and female heads are connected.

5. The dry quick coupling according to claim 4, characterized in that, Also includes: And / or, a third sealing ring and a fourth sealing ring for the female head, wherein the third sealing ring and the fourth sealing ring for the female head are respectively located between the axial valve seat and the rotating valve body, for the purpose of providing a double-layer sealing function; And / or, a fifth sealing ring and a sixth sealing ring for the female head, wherein the fifth sealing ring and the sixth sealing ring for the female head are respectively disposed on both sides of the double-row ball assembly, for achieving radial and axial sealing between the rotating valve housing and the fixed valve housing.

6. The dry quick coupling according to claim 5, characterized in that, The first sealing ring of the female head is a plug seal ring; And / or, the second sealing ring of the female head is a plug seal ring; And / or, the third sealing ring of the female head is a plug seal ring; And / or, the fourth sealing ring of the female head is a plug seal ring; And / or, the fifth sealing ring of the female head is a plug seal ring; And / or, the sixth sealing ring of the female head is a plug seal ring.

7. The dry quick coupling according to any one of claims 1-6, characterized in that, The rotary valve housing is provided with several handwheels arranged circumferentially. A force-applying rod is detachably installed on the handwheels. Rotating the force-applying rod will drive the handwheels and the rotary valve housing connected to them to rotate synchronously.

8. The dry quick coupling according to claim 1, characterized in that, The male connector includes: The male valve body has a guide groove and a limiting ring groove at one end, and a male flange at the other end, which is used to connect to a cryogenic fluid pipeline. A male sealing gland is disposed in the male valve body and located at the end of the male valve body away from the male flange. A second male sealing ring is also disposed on the male valve body. The second male sealing ring is used to achieve axial sealing when the male connector and the female connector are connected. A male sealing spring seat is disposed in the male valve body. A male first sealing ring is provided between the male sealing spring seat and the male sealing gland and is fixed by a countersunk screw to achieve radial sealing. A male positioning ring, the inner hole of which is clearance-fitted with the male valve stem of the male sealing spring seat, so that the male valve stem of the male sealing spring seat can move axially along the male positioning ring; A male spring is sleeved on the male valve stem and located between the male positioning ring and the male sealing spring seat, and is capable of axial extension and retraction.

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