CN219388939U - Rotary joint - Google Patents

Abstract

The utility model discloses a rotary joint, comprising: a first flange; a second flange; the middle assembly comprises a rotating shaft, a shaft sleeve, a plug seal and a rotating piece, wherein the rotating shaft is connected with the first flange, the shaft sleeve is connected with the second flange, the rotating shaft is rotatably arranged on the shaft sleeve, the rotating piece is arranged at the rotating connection part of the rotating shaft and the shaft sleeve, the plug seal is arranged at the opening part of a gap between the rotating shaft and the shaft sleeve, when the rotating joint is connected with low-temperature gas, air is pressurized to enter the gap, when the rotating joint stops working, the air temperature rises to form water, so that the rotating piece rusts, when the rotating joint is operated again next time, the rotating joint is connected with low-temperature gas, and the water is frozen to form ice, so that the rotating piece is blocked, the plug seal is arranged at the gap, and external air is prevented from entering the gap.

Description

Rotary joint

Technical Field

The utility model relates to the field of low-temperature engineering, and further relates to a rotary joint.

Background

The low-temperature engineering technology has a wide application range, such as aerospace, electronic superconducting, food drying, medical systems, low-temperature fluid transportation and the like. The low-temperature rotary joint is taken as an important component of the low-temperature fluid loading and unloading arm and plays an important role in the low-temperature fluid loading and unloading process. The cryogenic rotary joint is a closed pipeline element which can rotate 360 degrees along the axial direction. The tail end of the low-temperature conveying pipeline is required to be provided with a section of compensation pipeline connected with the storage tank, and the common compensation pipeline is provided with a metal corrugated hose and a loading arm. Since stainless steel corrugated metal hose may break without symptoms during high-strength operation, it is not recommended to apply to the filling of flammable and explosive liquids, especially in frequent operation situations, such as LNG receiving stations.

The low-temperature loading and unloading arm can increase the degree of freedom through the combined use of a plurality of rotary joints, realize freely adjusting the interface position in a certain range, and realize the function of being connected with the target storage tank joint. The loading arm is convenient to operate and high in reliability, and no sign burst is generated due to fatigue.

At present, the low-temperature rotary joint is mainly used for LNG loading and unloading arms, and the rotary joint is kept smooth in rotary operation during operation, freezing clamping stagnation is avoided, and a nitrogen purging mode is generally adopted to keep the drying of the cavity of the rotary shaft. Therefore, not only is nitrogen consumed, but also a purging pipeline is required to be arranged to convey the nitrogen, so that the manufacturing and operation cost is increased, and in addition, when the loading and unloading arm is used for conveying a medium (such as liquid hydrogen) below a liquid nitrogen temperature zone, the scheme of purging and drying the nitrogen cannot be realized.

Disclosure of Invention

The present utility model is directed to a rotary joint, in which a sealing plug is disposed in a gap between a shaft sleeve and a rotary shaft to prevent external air from entering the gap between the rotary shaft and the shaft sleeve.

In order to achieve the above object, an object of the present utility model is to provide a rotary joint including: a first flange; a second flange; the middle assembly comprises a rotating shaft, a shaft sleeve, a plug seal and balls, wherein the rotating shaft is connected with the first flange, the shaft sleeve is connected with the second flange, the rotating shaft is rotatably arranged on the shaft sleeve, the balls are arranged at the rotating connection part of the rotating shaft and the shaft sleeve, and the plug seal is arranged at the opening part of a gap between the rotating shaft and the shaft sleeve so as to prevent external air from entering the gap between the rotating shaft and the shaft sleeve.

In the above rotary joint, the plug sealing comprises a first extending part and a second extending part which are staggered, the first extending part is mounted at the opening of the gap between the shaft sleeve and the rotary shaft, and the second extending part is fixed at one end of the shaft sleeve away from the first flange.

In the above rotary joint, the rotary joint further comprises a pressing ring and a first fixing piece, wherein the pressing ring is abutted to the outer side of the second extension part and is fixed to the shaft sleeve through the first fixing piece so as to fix the second extension part to the shaft sleeve.

In the above rotary joint, the universal plug seal further includes a third extension portion located in a gap between the pressing ring and the rotary shaft to seal the gap between the pressing ring and the rotary shaft.

In the above rotary joint, a side of the third extension portion, which is close to the pressure ring, has an inclined slope, and the third extension portion gradually decreases in size from the first extension portion to the outside.

In the above rotary joint, the third extension portion is a water blocking ring.

In the above rotary joint, the first extension part is a main sealing structure and comprises an elastic sealing body, wherein an accommodating cavity is formed in the elastic sealing body, and an elastic piece is arranged in the accommodating cavity.

In the above rotary joint, the rotary shaft is provided with a sliding groove, and the sliding groove is provided with a rotary member, and the rotary member is a ball.

In the above rotary joint, the shaft sleeve has a mounting hole, the rotary joint further includes a second fixing member, a retaining screw, and a groove cover plate, the mounting hole corresponds to the sliding groove, the second fixing member is mounted to the mounting hole, the second fixing member abuts against the ball, the retaining screw is mounted to the second fixing member away from one end of the ball, and the groove cover plate is mounted to the outer side of the retaining screw.

In the above rotary joint, a first sealing member is provided at a side of a gap between the rotary shaft and the shaft sleeve, which is close to the second flange, and a second sealing member is provided at a gap between the second flange and the rotary shaft.

Compared with the prior art, the utility model has the following beneficial effects:

1. through setting up the pan plug and sealing in the clearance between axle sleeve and rotation axis, prevent that air from getting into, avoid freezing the jamming and the ball rust.

2. The utility model discloses a general plug sealing structure integrated with a water retaining ring, a static sealing ring and a main sealing surface, which realizes the static sealing on the shaft sleeve side and the water retaining function on the shaft side while taking the sealing function of the general plug sealing into consideration.

3. Through setting up recess apron welded seal, realized the reliable seal of steel ball mounting hole, adopt laser cold welding simultaneously, the welding seam is as little as possible, when needs dismantlement, only need use the angle mill to grind the welding seam can.

4. The shaft, the shaft sleeve, related steel balls, sealing rings and other wearing parts form an intermediate assembly, the intermediate assembly is transported back to the factory for maintenance by adopting an integral replacement scheme when in need of field maintenance, and the replacement is very convenient and quick.

5. The method is widely applied to mediums below a liquid nitrogen temperature zone.

6. The drying of the rotating shaft cavity is kept without adopting a nitrogen purging mode.

Drawings

The above features, technical features, advantages and implementation of the present utility model will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clear and easily understood manner.

FIG. 1 is a subjective view of a swivel joint according to a preferred embodiment of the utility model;

FIG. 2 is an overall view of a preferred embodiment rotary union of the present utility model;

FIG. 3 is a cross-sectional view of a preferred embodiment rotary union of the present utility model;

FIG. 4 is an enlarged partial view of a preferred embodiment B of the present utility model;

FIG. 5 is an enlarged partial view of a preferred embodiment C of the present utility model;

fig. 6 is an exploded perspective view of a rotary joint according to a preferred embodiment of the present utility model.

Reference numerals illustrate:

the sealing device comprises a first flange 100, an intermediate assembly 200, a second flange 300, a first sealing ring 110, a rotating shaft 210, a shaft sleeve 220, a sliding groove 211, balls 212, a flood seal 213, a first fixing piece 214, a first extending part 215, a second extending part 216, a third extending part 217, a water blocking ring 218, an elastic piece 219, a containing cavity 2110, a compression ring 221, a second fixing piece 222, a groove cover 223, a retaining screw 224, a first sealing piece 225, a second sealing ring 310 and a second sealing piece 320.

Detailed Description

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will explain the specific embodiments of the present utility model with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the utility model, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

For simplicity of the drawing, only the parts relevant to the utility model are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

Referring to fig. 1-6, in one embodiment there is provided a rotary joint comprising: a first flange 100; a second flange 300; the middle assembly 200 comprises a rotating shaft 210, a shaft sleeve 220, a flood seal 213 and balls 212, wherein the rotating shaft 210 is connected with the first flange 100, the shaft sleeve 220 is connected with the second flange 300, the rotating shaft 210 is rotatably installed on the shaft sleeve 220, the balls 212 are installed at the rotating connection part of the rotating shaft 210 and the shaft sleeve 220, and the flood seal 213 is arranged at the opening part of a gap between the rotating shaft 210 and the shaft sleeve 220 so as to prevent external air from entering the gap between the rotating shaft 210 and the shaft sleeve 220.

Preferably, when the rotary joint is connected to the device, the low-temperature gas passes through the rotary joint, and through the opening part of the gap between the rotary shaft 210 and the shaft sleeve 220 provided with the flood plug 213, when the rotary joint is connected to the low-temperature gas, air cannot enter the gap between the rotary shaft 210 and the shaft sleeve 220, so that the ball 212 is prevented from being frozen and stuck, the flood plug 213 has a simple structure, is widely applied, can be applied to a medium below a liquid nitrogen temperature region, is convenient to use, and does not need to adopt a nitrogen purging mode to keep the drying of the cavity of the rotary shaft.

Referring to fig. 4, in one embodiment, the flood-seal 213 includes first extending portions 215 and second extending portions 216 that are staggered, the first extending portions 215 are installed at an opening of a gap between the shaft sleeve 220 and the rotating shaft 210, the second extending portions 216 are fixed at an end of the shaft sleeve 220 away from the first flange 100, and the flood-seal 213 is fixed at the gap between the rotating shaft 210 and the shaft sleeve 220 to prevent the flood-seal 213 from loosening.

Referring to fig. 4, in one embodiment, the rotary shaft further includes a compression ring 221 and a first fixing member 214, wherein the compression ring 221 abuts against the outer side of the second extension portion 216 and is fixed to the shaft sleeve 220 by the first fixing member 214 to fix the second extension portion 216 to the shaft sleeve 220, the compression ring 221 fixes the second extension portion 216 to the shaft sleeve 220, and the first fixing member 214 fixes the second extension portion 216 to the compression ring 221, so that a sealing form is formed to prevent external air from entering a gap between the rotary shaft 210 and the shaft sleeve 220.

Preferably, the first fixing member 214 is a screw by which the second extension 216 is fixed to the pressing ring 221. Alternatively, the first fixing member 214 can also be a rivet.

Referring to fig. 4, in one embodiment, the flood seal 213 further includes a third extension 217, where the third extension 217 is located in a gap between the pressure ring 221 and the rotating shaft 210 to seal the gap between the pressure ring 221 and the rotating shaft 210, and the pressure ring 221 presses the third extension 217 to form a sealed space between the rotating shaft 210 and the sleeve 220, so as to perform a sealing function to prevent external air from entering the gap between the rotating shaft 210 and the sleeve 220.

Referring to fig. 4, in one embodiment, a side of the third extension portion 217 near the compression ring 221 has an inclined slope, the outward dimension of the third extension portion 217 from the first extension portion 215 is gradually reduced, after the inclined surface of the third extension portion 217 contacts with the compression ring 221, the compression ring 221 moves relatively to the first extension portion 215, because the outward dimension of the inclined surface of the third extension portion 217 from the first extension portion 215 is gradually reduced, the gap between the compression ring 221 and the third extension portion 217 is smaller and smaller, and the tightness of the plug seal 213 is increased, so as to prevent the external air from entering the gap between the rotation shaft 210 and the sleeve 220.

Referring to fig. 4, in one embodiment, the third extension portion 217 is a water blocking ring 218, when the rotary joint is connected to low-temperature air, the low-temperature air will enter the gap between the rotary shaft 210 and the shaft sleeve 220, when the rotary joint ends working, the ambient temperature returns to normal, at this time, the low-temperature gas will be converted into water to flow into the gap between the rotary shaft 210 and the shaft sleeve 220, and the water blocking ring 218 isolates the water outside the flood-seal 213 through the water blocking ring 218, so as to avoid the condensed water from entering the gap between the rotary shaft 210 and the flood-seal 213.

Referring to fig. 4, in one embodiment, the first extension 215 is a main sealing structure, and includes an elastic sealing body, in which a receiving cavity 2110 is formed, and an elastic member 219 is disposed in the receiving cavity, and the contact area and pressure between the sealing plug and the shaft sleeve 220 and the rotating shaft 210 are increased by the elastic member 219, so as to increase the sealing performance.

Referring to fig. 5, in one embodiment, the rotation shaft 210 is provided with a sliding groove 211, and balls 212 are installed on the sliding groove 211, and when the rotation shaft 210 rotates, the balls 212 move along with the rotation shaft, thereby reducing friction and improving transmission efficiency of mechanical power.

Referring to fig. 3 and 5, in one embodiment, the shaft sleeve 220 has a mounting hole, the rotary joint further includes a second fixing member 222, a retaining screw 224 and a groove cover plate 223, the mounting hole corresponds to the sliding groove 211, the second fixing member 22 is mounted on the mounting hole, the second fixing member 222 is abutted against the ball 212, the retaining screw 224 is mounted at one end of the second fixing member 222 far away from the ball 212, the groove cover plate 223 is mounted at the outer side of the retaining screw 224, the ball 212 is abutted against the sliding groove 211 by means of the retaining screw 224, the groove cover plate 223, the second fixing member 222 and the ball 212, the groove cover plate 223 is welded with the retaining screw 224 by means of laser cold welding, a welding seam is as small as possible, reliable sealing of the mounting hole is achieved, meanwhile, the ball 212 can be detached only by using an angle grinder during maintenance, and the second fixing member 222 is a steel ball plug.

Referring to fig. 3, in one embodiment, a gap between the rotation shaft 210 and the sleeve 220 has a first seal 225 at a side thereof adjacent to the second flange, and a gap between the second flange 300 and the rotation shaft 210 is provided with a second seal 320, and the gap between the rotation shaft 210 and the sleeve 220 and the gap between the second flange 300 and the rotation shaft 210 are sealed to prevent air from entering the gap between the rotation shaft 210 and the sleeve 220 and the gap between the second flange 300 and the rotation shaft 210.

Referring to fig. 3, a gap between the first flange 100 and the rotation shaft 210 is provided with a first sealing ring 110, a gap between the second flange 300 and the sleeve 220 is provided with a second sealing ring 310, and the gap between the first flange 100 and the rotation shaft 210 and the gap between the second flange 300 and the sleeve 220 are sealed to prevent air from entering the gap between the first flange 100 and the rotation shaft 210 and the gap between the second flange 300 and the sleeve 220.

Referring to fig. 1, 2 and 6, the intermediate assembly 200 is detachably connected to the first flange 100 and the second flange 300, and the first flange 100 and the second flange 300 are connected to the intermediate assembly 200 through countersunk screws, and the intermediate assembly is detachable to be returned to the factory for maintenance when the intermediate assembly needs maintenance, which is very convenient and quick to replace.

It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (8)

1. Rotary joint, its characterized in that includes:

a first flange;

a second flange;

the middle assembly comprises a rotating shaft, a shaft sleeve, a plug seal and a rotating piece, wherein the rotating shaft is connected with the first flange, the shaft sleeve is connected with the second flange, the rotating shaft is rotatably arranged on the shaft sleeve, the rotating piece is arranged at the rotating connection part of the rotating shaft and the shaft sleeve, and the plug seal is arranged at the opening part of a gap between the rotating shaft and the shaft sleeve so as to prevent external air from entering the gap between the rotating shaft and the shaft sleeve;

the plug sealing comprises a first extending part and a second extending part which are arranged in a staggered manner, the first extending part is arranged at the opening part of a gap between the shaft sleeve and the rotating shaft, and the second extending part is fixed at one end of the shaft sleeve, which is far away from the first flange; the rotary joint further comprises a pressing ring and a first fixing piece, wherein the pressing ring is abutted to the outer side of the second extension part and is fixed to the shaft sleeve through the first fixing piece so as to fix the second extension part to the shaft sleeve.

2. The rotary joint of claim 1 wherein the flood seal further comprises a third extension located in a gap between the pressure ring and the rotating shaft to seal the gap between the pressure ring and the rotating shaft.

3. The rotary joint of claim 2 wherein a side of the third extension adjacent the compression ring has an inclined ramp, the third extension tapering from the first extension outward dimension.

4. The rotary joint of claim 2 wherein the third extension is a water stop ring.

5. The rotary joint according to claim 1, wherein the first extension is a primary seal structure comprising an elastomeric seal body having a receiving cavity therein with an elastomeric member.

6. The rotary joint according to claim 1, wherein the rotary shaft is provided with a sliding groove, and a rotating member is mounted on the sliding groove, and the rotating member is a ball.

7. The rotary joint according to claim 6, wherein the shaft sleeve is provided with a mounting hole, the rotary joint further comprises a second fixing piece, a retaining screw and a groove cover plate, the mounting hole corresponds to the sliding groove, the second fixing piece is mounted on the mounting hole, the second fixing piece is abutted to the ball, the retaining screw is mounted at one end, far away from the ball, of the second fixing piece, and the groove cover plate is mounted on the outer side of the retaining screw.

8. The rotary joint according to claim 1, wherein a gap between the rotary shaft and the bushing has a first seal on a side thereof adjacent to a second flange, and wherein a gap between the second flange and the rotary shaft has a second seal.