CN215674154U - Clearance seal type hydraulic center rotary joint - Google Patents

Abstract

The utility model discloses a clearance sealing type hydraulic central rotary joint which comprises a mandrel, a rotating shaft and a sealing ring, wherein the mandrel is longitudinally distributed; the outer surface of the mandrel is sleeved with a bush; the outer surface of the bush is sleeved with a rotating machine; the front end and the middle outer surface of the mandrel are respectively sleeved with a front bearing and a rear bearing; a circular channel is processed at the outer edge of the rear end face of the mandrel; one end of a compression spring is assembled on the rear end surface of the mandrel and is jointed with the circular groove; the other end of the compression spring is assembled on the fixed part. The mandrel is provided with two oil inlet and outlet ports, two leakage ports and a through port; one end of each of the two inlet and outlet metal pipes is respectively connected with two oil inlet and outlet ports on the rear end surface of the mandrel; one end of each of the two leakage opening metal pipes is respectively connected with the two leakage openings on the rear end surface of the mandrel; the other end of the outlet metal pipe and the other end of the leakage metal pipe are assembled on the fixing part. The utility model has good internal sealing performance and strong reliability, can reduce the leakage of fluid medium and increase the sealing effect of the structure.

Description

Clearance seal type hydraulic center rotary joint

Technical Field

The utility model relates to the technical field of hydraulic rotary joints, in particular to a clearance sealing type hydraulic central rotary joint.

Background

The existing gap sealing rotary joint generally comprises a front end cover, a rear end cover, an oil inlet and an oil outlet, a leakage opening, a mandrel, a joint body and a plurality of sealing parts, wherein the oil inlet and the oil outlet are arranged on the mandrel, the leakage opening is arranged on the joint body, and the rotary joint is fixed through the front end cover and the rear end cover.

For the existing gap sealing rotary joint, in the working process, the joint body and the end cover are kept fixed, and the mandrel can rotate freely. Common clearance seal rotary joint in the use, because each spare part rigidity, the small clearance between its inside spare part can receive the effect of uniform load and impact load and change to open the leak opening on the joint body, can increase the size of joint body, reduce the stability of its structure, influence the sealed effect of structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a clearance sealing type hydraulic center rotary joint aiming at the technical defects in the prior art.

To this end, the utility model provides a clearance-sealed hydraulic central swivel joint comprising longitudinally distributed spindles;

wherein, the outer surface of the mandrel is sleeved with a bush;

wherein, the outer surface of the bush is sleeved with a hollow rotating machine;

the front side and the rear side of the rotating machine are fixedly provided with a front end cover and a rear end cover respectively through fastening screws;

wherein, the front end and the middle outer surface of the mandrel are respectively sleeved with a front bearing and a rear bearing;

the front bearing and the rear bearing are respectively positioned on the rear side of the front end cover and the front side of the rear end cover;

wherein, the outer edge of the rear end surface of the mandrel is provided with a circular channel;

one end of a helical compression spring is assembled on the rear end surface of the mandrel and is jointed with the circular groove;

the other end of the compression spring is assembled on the fixed part.

The mandrel is provided with two oil inlet and outlet ports, two leakage ports and a through port;

the port is positioned in the center of the mandrel;

the two oil inlet and outlet ports and the two leakage ports are alternately and uniformly distributed around the through port;

one end of each of the two inlet and outlet metal pipes is respectively connected with two oil inlet and outlet ports on the rear end surface of the mandrel;

one end of each of the two leakage opening metal pipes is respectively connected with the two leakage openings on the rear end surface of the mandrel;

the other end of the outlet metal tube and the other end of the leakage metal tube are both assembled on the hollow fixed part.

Preferably, the front bearing is assembled between the front end face of the bushing and the rear end face of the front end cover;

and the rear bearing is assembled between the rear end surface of the bushing and the front end surface of the rear end cover.

Preferably, a front oil seal groove which is distributed in a surrounding way is processed in the front end cover;

an annular front oil seal and a front oil seal clamp spring are arranged in a front oil seal groove of the front end cover;

and the front oil seal clamp spring are tightly attached to the front oil seal groove.

Preferably, a rear oil seal groove which is distributed in a surrounding way is processed in the rear end cover;

an annular rear oil seal and a rear oil seal snap spring are arranged in the rear oil seal groove;

and the rear oil seal snap spring are tightly attached to the rear oil seal groove.

Preferably, the mandrel has a plurality of circumferentially distributed rubber seal grooves on the outer surface thereof, and each rubber seal groove is fitted with an annular rubber seal in an interference fit manner.

Preferably, a plurality of hemispherical slotted holes are circumferentially arranged on one side end face of the front end cover close to the mandrel;

an end cover roller is respectively assembled in each hemispherical slotted hole;

the front end surface of the mandrel is provided with an annular hemispherical groove channel in a surrounding way at the position corresponding to the hemispherical slotted hole;

the two sides of the end cover roller are respectively tangent with the hemispherical slotted hole and the hemispherical groove.

Preferably, the rotating machine is provided with two oil inlet and outlet passage ports;

one end of each oil inlet and outlet channel opening is respectively communicated with one oil inlet and outlet opening.

Preferably, the outer surface of the mandrel is provided with an oil drainage groove;

the oil drainage groove is communicated with the two leakage ports;

the oil drainage groove is matched with the inner surface of the bushing to form an oil drainage cavity.

Preferably, the outer surface of the mandrel has an oil inlet and outlet groove;

the oil inlet and outlet groove is communicated with the two oil inlet and outlet ports;

the inner surface of the bush is provided with an inner groove at a position corresponding to the oil inlet and outlet groove;

the oil inlet and outlet grooves are matched with the inner grooves on the inner surface of the lining to form an oil inlet and outlet cavity.

Preferably, the outer surface of the mandrel is provided with an annular rubber sealing ring at a position between each oil leakage cavity and the adjacent oil inlet and outlet cavity.

Compared with the prior art, the gap-sealed hydraulic center rotary joint has the advantages that the structural design is scientific, the stability and the reliability of the gap-sealed rotary joint are improved, the internal sealing performance is good, the reliability is high, the leakage of a fluid medium can be reduced, the structural sealing effect is improved, the applicability of a hydraulic system adopting the rotary joint on a rotary machine is further improved, and the practical significance is great.

Drawings

FIG. 1 is a side-on-axis semi-sectional view of a clearance-sealing hydraulic center swivel provided in accordance with the present invention;

FIG. 2 is a cross-sectional view of a gap-sealing hydraulic center swivel according to the present invention, taken vertically along an axial direction;

FIG. 3 is a transverse cross-sectional view of a clearance-sealed hydraulic center swivel provided in accordance with the present invention;

FIG. 4 is a rear view of a gap-sealed hydraulic center swivel joint according to the present invention

FIG. 5a is a left side view of a gap-sealed hydraulic center swivel according to the present invention, having a line C-C;

FIG. 5b is a view taken along line C-C of FIG. 5 a;

FIG. 6a is a second left side view of a gap-sealing hydraulic center swivel according to the present invention, having lines D-D thereon;

FIG. 6b is a view taken along line D-D of FIG. 6 a;

in the figure: 1. the front end cover, 2, the front bearing, 3, the mandrel, 4, the bush, 5 and the rear bearing; 6. a rear end cover 7, a compression spring 8, an inlet and outlet metal pipe 9, a leakage opening metal pipe 10 and a rear oil seal groove; 11. a rear oil seal 12, a rubber sealing ring 13, a front oil seal groove 14, a sealing washer 15 and a front oil seal; 16. end cover rollers 17, oil inlet and outlet ports 18, leakage ports 19, through ports 20 and oil discharge chambers; 21. an oil inlet and outlet cavity 22, a fastening screw 23, a fixing part 24 and a rotary machine.

Detailed Description

In order to make the technical means for realizing the utility model easier to understand, the following detailed description of the present application is made in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that in the description of the present application, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In addition, it should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the term "mounted" and the like should be interpreted broadly, and may be, for example, either fixedly mounted or detachably mounted.

The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.

Referring to fig. 1 to 6b, the present invention provides a gap-sealed hydraulic center rotary joint, comprising a mandrel 3 longitudinally distributed;

wherein, the outer surface of the mandrel 3 is sleeved with a bush 4;

wherein, the outer surface of the bush 4 is sleeved with a hollow rotating mechanism 24 (namely, a hollow cylinder structure);

the front side and the rear side of the rotating machine 24 are fixedly provided with a front end cover 1 and a rear end cover 6 through fastening screws 22 respectively;

wherein, the front end and the middle outer surface of the mandrel 3 are respectively sleeved with a front bearing 2 and a rear bearing 5;

the front bearing 2 and the rear bearing 5 are respectively positioned on the rear side of the front end cover 1 and the front side of the rear end cover 6.

In particular, a circular groove is processed on the outer edge of the rear end face of the mandrel 3;

one end of a helical compression spring 7 is fitted on the rear end face of the spindle 3 to engage with the circular groove;

the other end of the hold-down spring 7 is fitted on the fixing part 23.

It should be noted that, for the present invention, when the rotary joint of the present invention is applied to a wheel, a small turbine and a small winding machine, the rotary machine 24 may correspond to the rotary structures such as a wheel hub, an inner rotor of a wind turbine, a winding drum on a winding machine, a connecting flange, etc., respectively; the fixed parts 23 may be non-rotating structures such as a vehicle suspension swing arm or a knuckle, a wind turbine inner stator or mechanism housing, and a bobbin winder upper bearing cover or bearing seat, respectively.

In the utility model, the front bearing 2 is assembled between the front end surface of the bush 4 and the rear end surface of the front end cover 1;

and the rear bearing 5 is assembled between the rear end surface of the bushing 4 and the front end surface of the rear end cover 6.

In the utility model, in the concrete implementation, a front oil seal groove 13 which is distributed in a surrounding way is processed in the front end cover 1;

an annular front oil seal 15 and a front oil seal snap spring (usually in an annular shape with a gap) are arranged in the front oil seal groove 13 of the front end cover 1;

and the front oil seal 15 and the front oil seal clamp spring are tightly attached to the front oil seal groove 13.

In the utility model, in the concrete implementation, a rear oil seal groove 10 which is distributed in a surrounding way is processed in the rear end cover 6;

an annular rear oil seal 11 and a rear oil seal snap spring (usually in an annular shape with a gap) are arranged in the rear oil seal groove 10;

and the rear oil seal 11 and the rear oil seal snap spring are tightly attached to the rear oil seal groove 10.

It should be noted that, for the present invention, the sleeve 4 is fitted over the mandrel 3, and both are enclosed together between the front end cap 1 and the rear end cap 6. Wherein the inner surface of the bushing 4 is a close fit with the outer surface of the mandrel 3.

In the present invention, in a specific implementation, the outer surface of the mandrel 3 has a plurality of circumferentially distributed rubber seal grooves, and an annular rubber seal 12 is fitted in each rubber seal groove in an interference fit manner.

In the present invention, in particular, referring to fig. 1 and 2, a plurality of hemispherical groove holes (i.e. concave holes) are circumferentially arranged on an end surface of the front end cover 1 near the mandrel 3;

in each hemispherical groove hole, an end cover roller 16 is respectively assembled;

the front end surface of the mandrel 3 is provided with an annular hemispherical groove channel in a surrounding way at the position corresponding to the hemispherical slotted hole;

the two sides of the end cover roller 16 are respectively tangent with the hemispherical groove hole and the hemispherical groove.

In the present invention, in a specific implementation, as shown in fig. 4, the mandrel 3 has two oil inlets and outlets 17, two leakage ports 18, and a through port 19;

the through opening 19 is positioned in the center of the mandrel 3;

the two oil inlet and outlet ports 17 and the two leakage ports 18 are alternately and uniformly distributed around the through port 19;

the two oil inlet/outlet ports 17 are not communicated with the two leak ports 18 and the port 19.

In particular, the rotary machine 24 (i.e., the hollow cylinder structure) is provided with two oil inlet and outlet ports 170;

one end of each oil inlet/outlet passage port 170 is respectively communicated with one end of one oil inlet/outlet port 17;

the other end of the inlet/outlet oil passage port 170 communicates with an oil inlet port of an externally located hydraulic actuator (e.g., a hydraulic motor and a hydraulic cylinder) (e.g., via a hydraulic line).

In a specific implementation, as shown in fig. 4 to 6b, the central holes are formed in the mandrel 3 and the front end cap 1, so as to form a through opening 19.

In the present invention, the port 19 is used to conduct a small pipe such as a control line and an air pipe of an inflation/deflation system when the rotary joint of the present invention is operated.

In the utility model, in the concrete implementation, one ends of two inlet and outlet metal pipes 8 are respectively connected with two oil inlet and outlet ports 17 on the rear end surface of the mandrel 3, and the assembly is carried out in a threaded connection mode;

one end of each of the two leakage metal pipes 9 is connected to the two leakage ports 18 on the rear end surface of the mandrel 3, and the two leakage metal pipes are assembled in a threaded manner.

In a specific implementation, the other end of the inlet/outlet metal pipe 8 and the other end of the leakage metal pipe 9 are both assembled on the hollow fixing part 23 (for example, by means of screw connection).

It should be noted that, for the present invention, the oil inlet/outlet 17 is communicated to the existing hydraulic system (including the valve body for regulation and control, the hydraulic pump, the hydraulic pipeline, etc.) located outside through the inlet/outlet metal pipes 8 and the hydraulic oil pipe connected to the inlet/outlet metal pipes 8. In the working process of the mechanism, a hydraulic medium driven and controlled by an external hydraulic system enters the oil inlet and outlet 17 in the rotary joint through a hydraulic oil pipe, then enters the oil inlet and outlet channel 170 on the rotary machine 24, and finally is guided into a hydraulic actuator (such as a hydraulic motor and a hydraulic cylinder) to realize hydraulic transmission.

In particular, the outer surface of the mandrel 3 is provided with an oil drainage groove;

the oil drainage groove is communicated with two leakage ports 18;

the oil drainage groove, in cooperation with the inner surface of the bush 4, constitutes an oil drainage chamber 20.

In particular, the outer surface of the mandrel 3 is provided with an oil inlet and outlet groove;

the oil inlet and outlet grooves are communicated with the two oil inlet and outlet ports 17;

an inner surface of the liner 4 having an inner groove at a position corresponding to the oil inlet/outlet groove;

the oil inlet/outlet groove is fitted (specifically, precisely fitted) with an inner groove on the inner surface of the liner 4, and constitutes an oil inlet/outlet chamber 21.

In concrete implementation, the outer surface of the mandrel 3 is provided with an annular rubber sealing ring 12 at a position between each oil leakage cavity 20 and the adjacent oil inlet and outlet cavity 21.

In particular, the inlet and outlet metal pipes 8, the oil inlet and outlet 17 and the oil inlet and outlet chamber 21 together form an oil inlet and outlet passage (two oil inlet and outlet passages in total) in the rotary joint;

the leakage opening metal pipe 9, the leakage opening 18 and the oil drainage cavity 20 together form a leakage oil channel in the rotary joint.

Based on the above technical solutions, the present invention adopts the gap sealing technology, the bearing is assembled between the spindle 3 and the rotary machine 24, and the leakage of the fluid medium is limited by the small gap between the bush 4 and the spindle 3.

For the utility model, in particular, the mandrel 3 is sleeved in the bushing 4;

the outer surface of the mandrel 3 is fitted (specifically, precisely fitted) to the inner surface of the bush 4 with a predetermined gap (specifically, a slight gap) left therebetween.

For the utility model, a front bearing 2 and a rear bearing 5 are respectively assembled at the front and the rear of a mandrel 3, and a front end cover 1 and a rear end cover 6 are respectively assembled outside the two bearings. The front end cover 1 and the rear end cover 6 are respectively provided with a plurality of threaded holes which can be fixed on the rotating machine 24 through threaded connection.

For the present invention, the mandrel 3 is drilled with two oil inlet and outlet ports 17, two leakage ports 18, and one through port 19, respectively. Wherein, there are metal oil pipes (specifically, import and export metal pipes and leakage mouth metal pipes) at the rear end of the mandrel 3, and the metal oil pipes are respectively communicated with the oil inlet and outlet 17 and the leakage mouth 18 through threads, and the metal pipes are matched with the fixing part 23.

For the utility model, the outer edge of the rear end of the mandrel 3 is provided with a hemispherical groove, the compression spring 7 is matched with the hemispherical groove, namely, the compression spring is pressed at the rear end of the mandrel 3, and the mandrel 3 is pressed towards the front end cover 1 under the action of the spring force.

For the utility model, the front end cover 1 is provided with a hemispherical slotted hole (hemispherical groove) on the end surface adjacent to the mandrel 3, the mandrel 3 is provided with a hemispherical groove channel at the position corresponding to the front end surface adjacent to the front end cover, a spherical end cover roller 16 is added in the hemispherical groove channel, and the end cover roller 16 is respectively tangent with the hemispherical slotted hole and the hemispherical groove channel, thereby realizing the relative movement between the front end cover 1 and the mandrel 3 and changing the relative movement into the rolling of the spherical end cover roller.

According to the utility model, gap sealing is adopted, the bushing 4 is added between the mandrel 3 and the rotary machine 24, the leakage of fluid medium is limited by a small gap between the inner surface of the bushing 4 and the outer surface of the mandrel 3, and oil drainage grooves are respectively processed between the front section and the rear section of the mandrel 3 and between two oil inlet and outlet channels, as shown in fig. 5b and 6b, the three oil drainage grooves and the inner surface of the bushing 4 are matched to form an oil drainage cavity 20, so that the medium leaked out in the gap sealing can be stored and guided back to an external oil tank.

In the present invention, the gap seal mainly uses a minute gap between the components to form a flow resistance required for sealing. In the utility model, in a small gap between the outer surface of the mandrel 3 and the inner surface of the bushing 4, the flow of the fluid medium is greatly blocked, and the reverse pressure borne during the flow is large, while in a larger gap space such as the oil drainage cavity 20, the flow of the fluid medium is relatively slightly blocked, and the reverse pressure borne during the flow is small, so that the generated pressure difference drives the fluid medium leaked from the oil inlet and outlet cavity 21 to converge into the oil drainage cavity 20.

The oil leakage chamber 20 is directly communicated with the leakage port 18, and the rear end of the leakage port 18 is communicated with the leakage port metal pipe 9. In practical application, the metal leakage pipe 9 is conducted to an external hydraulic oil tank through a connected hydraulic oil pipe. The hydraulic medium in the drain chamber 20 can thus pass through the leakage opening 18, the leakage opening metal tube 9 and the hydraulic oil line and finally flow back into the hydraulic oil tank located outside.

For the utility model, two oil inlet and outlet ports 17, two leakage ports 18 and a through port 19 are respectively arranged on the rear end surface of the mandrel 3, wherein the through port 19 is positioned in the center of the mandrel 3 and penetrates through the mandrel 3, the oil inlet and outlet ports 17 and the leakage ports 18 are uniformly and alternately distributed around the through port 19, the oil inlet and outlet ports 17 are used as a part of an oil inlet and outlet channel and are communicated to an oil inlet and outlet cavity 21, and the leakage port 18 is used as a part of an oil leakage channel and is communicated to an oil drainage cavity 20.

According to the utility model, a circular groove is processed on the outer edge of the rear end face of the mandrel 3, the compression spring 7 behind the mandrel is matched with the circular groove, and the mandrel 3 is pushed to the front end cover 1 under the action of the compression spring 7, so that parts in the central rotating joint can be kept in a tight matching state.

For the utility model, a plurality of hemispherical concave holes (i.e. hemispherical slotted holes) are processed on one surface of the front end cover 1 close to the front end surface of the mandrel 3, a hemispherical groove is processed on the front end surface of the mandrel 3, an end cover roller 16 is assembled between the front end cover 1 and the mandrel 3, and the end cover roller 16 is matched with the hemispherical concave holes and tangent to the hemispherical groove, so that when the mandrel 3 is pressed to the front end cover 1 and the mandrel 3 moves relatively, the friction between the mandrel and the front end cover 1 can be reduced through the end cover roller 16.

For the utility model, the central position of the end surface of the mandrel 3 is provided with a round hole penetrating through the mandrel 3, the central position of the end surface of the front end cover 1 is also provided with a round hole penetrating through the front end cover 1, and the round hole of the mandrel 3 and the round hole of the front end cover 1 form a through hole 19 together.

The clearance sealing type hydraulic center rotary joint provided by the utility model can be used for high-speed and high-pressure rotary machines, and has the advantages of stable structure, small leakage amount of fluid medium and good overall sealing property.

In the utility model, the component with the compressing function comprises a gland and a compression spring, and is used for compressing and fixing the integral structure to enable all parts in the integral structure to be tightly attached; the bearings (including the front bearing 2 and the rear bearing 5) are used to reduce friction between the rotary machine and the swing mechanism.

The slewing mechanism comprises a mandrel and a bushing, wherein the mandrel is provided with an oil inlet and outlet, an oil drain opening and a through opening, so that the smoothness of an oil way in the rotation process of an assembly machine can be ensured; the metal oil pipe (including the inlet and outlet metal pipe 8 and the leakage metal pipe 9) is used for connecting an external oil path (a connecting pipeline of the external oil path enters the hollow fixed part 23), and meanwhile, the rotary mechanism can also be connected with the fixed part, so that the rotary mechanism is kept static.

In order to more clearly understand the technical scheme of the utility model, the working principle and the working process of the patent of the utility model are explained as follows:

the central rotary joint adopts clearance sealing, and the loss of a fluid medium is limited mainly by a tiny clearance between the inner surface of the lining 4 and the outer surface of the mandrel 3;

the center rotary joint is limited by a front end cover 1 and a rear end cover 6 and is fixed on a rotary machine 24;

wherein, the mandrel 3 is indirectly assembled on the fixed part 23 through the inlet and outlet metal tube 8 and the leakage metal tube 9;

the front bearing 2 and the rear bearing 5 between the mandrel 3 and the rotating machine 24 can reduce the friction loss generated by the relative movement of the mandrel 3 and the rotating machine;

the mandrel 3 is pushed to the front end cover 1 under the action of the rear compression spring 7, so that the internal parts of the central rotating joint can be kept in a tight fit state, and the end cover roller 16 is arranged between the front end cover 1 and the mandrel 3, so that friction generated by relative movement of the front end cover 1 and the mandrel 3 can be reduced.

For the utility model, when the central rotary joint works, the front end cover 1 and the rear end cover 6 move together with the rotary machine 24, and the mandrel 3, the inlet and outlet metal pipes 8 and the leakage metal pipe 9 keep relatively static;

when hydraulic fluid medium is fed in by the external hydraulic system drive control, it flows into the rotary machine 24 through the inlet and outlet oil passages to provide hydraulic power to the hydraulic components in the rotary machine 24, and when the fluid medium flows back, the flow direction is opposite to that of the feed.

The fluid medium leaking from the small gap between the inner surface of the bushing 4 and the outer surface of the mandrel 3 accumulates in the oil drain cavity 20 and flows back to the hydraulic oil tank located outside through the leakage oil passage (including the leakage metal pipe 9, the leakage 18 and the oil drain cavity 20).

In the utility model, the clearance sealing type hydraulic center rotary joint can be arranged at the center of a high-speed rotary machine such as a wheel, a small turbine, a small drum machine and the like, and in the process of the rotary work of the machine, the clearance sealing type hydraulic center rotary joint keeps an oil way smooth and keeps relatively static, the internal sealing property is good, the reliability is strong, and the applicability of a hydraulic system on the rotary machine can be effectively improved.

Compared with the prior art, the gap sealing type hydraulic center rotary joint provided by the utility model has the advantages that the structural design is scientific, the stability and the reliability of the gap sealing type rotary joint are improved, the internal sealing performance is good, the reliability is high, the leakage of a fluid medium can be reduced, the structural sealing effect is improved, the applicability of a hydraulic system adopting the rotary joint on a rotary machine is further improved, and the practical significance is great.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A clearance-sealed hydraulic centre swivel, characterized by comprising a longitudinally distributed spindle (3);

wherein, the outer surface of the mandrel (3) is sleeved with a bush (4);

wherein, the outer surface of the bushing (4) is sleeved with a hollow rotating machine (24);

the front side and the rear side of the rotating machine (24) are fixedly provided with a front end cover (1) and a rear end cover (6) through fastening screws (22);

wherein, the front end and the middle outer surface of the mandrel (3) are respectively sleeved with a front bearing (2) and a rear bearing (5);

the front bearing (2) and the rear bearing (5) are respectively positioned on the rear side of the front end cover (1) and the front side of the rear end cover (6);

wherein, the outer edge of the rear end surface of the mandrel (3) is provided with a circular groove;

one end of a helical compression spring (7) is assembled on the rear end surface of the mandrel (3) and is jointed with the circular groove;

the other end of the compression spring (7) is assembled on the fixed part (23);

wherein, the mandrel (3) is provided with two oil inlet and outlet ports (17), two leakage ports (18) and a through port (19);

the through opening (19) is positioned in the center of the mandrel (3);

the two oil inlet and outlet ports (17) and the two leakage ports (18) are alternately and uniformly distributed around the through port (19);

one end of each of the two inlet and outlet metal pipes (8) is respectively connected with two oil inlet and outlet ports (17) on the rear end surface of the mandrel (3);

one ends of the two leakage opening metal pipes (9) are respectively connected with two leakage openings (18) on the rear end surface of the mandrel (3);

the other end of the outlet metal pipe (8) and the other end of the leakage opening metal pipe (9) are both assembled on a hollow fixed part (23).

2. The gap-sealing hydraulic center rotary joint according to claim 1, wherein the front bearing (2) is fitted between a front end face of the bushing (4) and a rear end face of the front end cover (1);

and the rear bearing (5) is assembled between the rear end surface of the bushing (4) and the front end surface of the rear end cover (6).

3. The gap-sealing type hydraulic center swivel joint according to claim 1, wherein a front oil seal groove (13) is formed circumferentially in the front end cap (1);

an annular front oil seal (15) and a front oil seal clamp spring are arranged in a front oil seal groove (13) of the front end cover (1);

and the front oil seal (15) and the front oil seal clamp spring are tightly attached to the front oil seal groove (13).

4. The gap-sealing hydraulic centre swivel as claimed in claim 1, characterised in that in the rear end cap (6) there is machined a circumferentially distributed rear oil seal groove (10);

an annular rear oil seal (11) and a rear oil seal snap spring are arranged in the rear oil seal groove (10);

and the rear oil seal (11) and the rear oil seal clamp spring are tightly attached to the rear oil seal groove (10).

5. The gap-sealing hydraulic centre swivel as claimed in claim 1, characterized in that the mandrel (3) has on its outer surface a plurality of circumferentially distributed rubber sealing ring grooves, in each of which an annular rubber sealing ring (12) is fitted in an interference fit.

6. The gap-sealing type hydraulic center rotary joint according to claim 1, wherein a plurality of hemispherical groove holes are circumferentially provided on an end surface of the front end cover (1) on a side close to the mandrel (3);

each hemispherical groove hole is provided with an end cover roller (16);

the front end surface of the mandrel (3) is provided with an annular hemispherical groove channel in a surrounding way at the position corresponding to the hemispherical slotted hole;

two sides of the end cover roller (16) are respectively tangent with the hemispherical slotted hole and the hemispherical groove.

7. The gap-sealing hydraulic center rotary joint according to claim 1, wherein the rotary machine (24) is provided with two oil inlet and outlet passage ports (170);

one end of each oil inlet and outlet passage port (170) is respectively communicated with one oil inlet and outlet port (17).

8. The gap-sealing hydraulic centre swivel as claimed in claim 1, characterised in that the outer surface of the spindle (3) has oil relief grooves;

the oil drainage groove is communicated with the two leakage ports (18);

the oil drainage groove is matched with the inner surface of the bushing (4) to form an oil drainage cavity (20).

9. The gap-sealing hydraulic center swivel according to claim 8, characterized in that the outer surface of the spindle (3) has oil inlet and outlet grooves;

the oil inlet and outlet grooves are communicated with the two oil inlet and outlet ports (17);

the inner surface of the bush (4) is provided with an inner groove at a position corresponding to the oil inlet and outlet groove;

the oil inlet and outlet groove is matched with the inner groove on the inner surface of the bushing (4) to form an oil inlet and outlet cavity (21).

10. Gap-sealing hydraulic centre rotary joint according to claim 9, characterised in that the outer surface of the mandrel (3) is provided with an annular rubber sealing ring (12) at a position between each oil drain chamber (20) and the adjacent oil inlet and outlet chamber (21).

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