JPS6126712Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention reliably transfers ultra-high pressure liquid from the stationary side member to the rotating side member or from the rotating side member to the stationary side member without leakage of the passing fluid. The construction of a rotary joint for ultra-high pressure liquid that can provide good bridging flow will be described in detail below with reference to the accompanying drawings showing one embodiment.

oil. This system bridges and circulates ultra-high pressure liquid such as water from a stationary side member to a rotating side member or from a rotating side member to a stationary side member, and a rotating body 2 is rotatably attached to the front part of a stationary body 1. A large plunger 3, which is slidable in the direction of the rotation center axis of the rotating body 2, is fitted into the rotating body 2 and is attached by a press-fitting large spring 4 with its rear end surface abutted against the front end surface of the stationary body 1. The large plunger 3 is formed into a two-stage plunger with a small diameter portion at the front and a large diameter portion at the rear.
A small plunger 5 that can freely slide in the direction of the central axis of
A small pressure spring 6 is applied to the front end surface of the stationary main body 1 and installed inside the stationary body 1, and a communication passage 7 is bored through the small plunger 5 on the central axis thereof, and a small diameter sliding hole 8 of the large plunger 3 is formed. A rotation A port 9 is formed in the rotary body 2 so as to communicate with the front part, and the large sliding hole 10 is connected to the front part of the rotary body 2 and the stepped surface part 1 of the large plunger 3 is formed in the rotary body 2.
1 to form a rotating B port 12, while a stationary ring body 13 externally fitted to the rear of the stationary body 1 is formed with a stationary A port 14 and a stationary B port 15, and the stationary A Port 14 and the stationary body 1
A stationary main passage 16 communicating with the front end surface of the stationary body 1 and a stationary sub passage 17 communicating between the stationary B port 15 and the front end surface of the stationary body 1 are respectively bored in the stationary body 1, and 9 and the rear end surface of the small plunger 5 through the small plunger sliding hole 18. A rotating main passage 19 that communicates with the communicating passage 7 and a rotating sub passage 20 that communicates between the rotating B port 12 and the rear end surface of the large plunger 3 via the stepped surface portion 11 are connected to the stationary main passage. A hole is formed in the large plunger 3 so as to face the sub passages 16 and 17, and the pressure contact rear end surface area of the large plunger 3 and the small plunger 5 and the large plunger 3. A pressure contact force balanced by adjusting the area difference between the front end surface area of the small plunger 5 or the area of the stepped surface portion 11 according to the working pressure of the liquid and the rotation speed is applied between the front end surface of the stationary main body 1 and the large plunger 3. It is characterized in that it is configured to be provided between the small plunger 5 and the rear end surface of the small plunger 5.

In this figure, a rotating body 2 is rotatably fitted onto a stationary body 1 through a bearing 21, and a large plunger 3. Each small plunger 5 has a steel ball 22. Keyway-shaped groove 23. Rotation is prevented by a bolt 24.

Further, an O-ring 25 is interposed between the stationary ring body 13 and the stationary main body 1, and the stationary A port 1
4. Pressure oil sent from the stationary B port 15 causes the O-ring 25 to flex, thereby sealing the bearing surface.

Further, an annular groove 26 is formed on the rear end surface of the large plunger 3 so as to be continuous with the rotating sub-path 20, while a pressure ring 26 having excellent wear resistance is formed on the front end surface of the stationary body 1.
7 is installed.

Reference numeral 28 is a drain port.

Further, a coolant introduction chamber 29 is formed outside the bearing 21, and is communicated with the coolant introduction chamber 29, so that a liquid inlet 30 and an outlet 3 are connected to the rotary body 2.
1 are formed respectively, and the cooling liquid is passed through the cooling liquid introduction chamber 29 to suppress heat generation in each part.

Also, large plunger 3. The pressing force between the pressing rear end surface of the small plunger 5 and the pressing front end surface of the stationary body 1 is determined based on the hydraulic balance based on the pressure of the liquid used and the rotation speed. It is determined by considering the contact surface pressure, but for example, in the case of the diameter as shown in Fig. 2, () Hydraulic balance In the bridge between the rotating main passage 19 and the stationary main passage 16, πd ² ₃ / 4 and πd ² ₁ /4 In the bridge between the rotating sub-path 20 and the stationary sub-path 17, (πD ² /4−πd ² /4) and (πD ² ₃ /4−π
Balance ( ) with D ² ₂ /4) Contact surface pressure In the bridge between the rotating main passage 19 and the stationary main passage 16, πd ² ₃ /4−πd ² ₁ /4) and (πd ² ₂ / 4-π
Balance with (πD ² /4−πd ² /4 ^{) and (πD 2 2} _/ 4−π ₎ in the bridge between the rotating sub-passage 20 and the stationary sub-passage 17.
D ² ₁ /4) + (πD ² ₄ /4−πd ² ₃ /4), and such a hydraulic balance. Consider the contact surface pressure to obtain an appropriate contact force. For ultra-high pressure, increasing the hydraulic balance will create a perfect seal, and for ultra-high speeds, reducing the contact pressure can increase the speed. becomes.

Hitherto, this type of ultra-high pressure liquid rotary joint has been known as disclosed in Japanese Patent Publication No. 51-41933 Koho, etc., and this conventional technology presses and moves a plunger by the pressure of the pressure oil passing through it to move between the bridge end faces. Pressure is applied to prevent leakage of pressure oil.

However, ultra-high speed (3000~10000r.pm),
When bridging liquid from a stationary side member to a stationary side member or in the opposite direction under severe conditions of ultra-high pressure (700Kg/cm ² ), this structure allows the pressure oil bridging end face to match the pressure of the pressure oil. This has the disadvantage that a satisfactory function cannot be obtained at ultra-high speeds and ultra-high pressures.

The purpose of the present invention is to eliminate such inconveniences, and since it is constructed as described above, the stationary side supply pipe is connected to the stationary A port 14 and the stationary B port 15 of the stationary ring body 13, and When connecting a rotation side supply pipe to the rotation A port 9 and rotation B port 12 of the rotation main body 2 and supplying high pressure oil from the rotation side to the stationary side, on the one hand, high pressure oil is supplied via the rotation A port 9. , the high-pressure oil flows into the main rotating passage 19 of the large plunger 3 through the small-diameter sliding hole 8 and then through the small plunger sliding hole 1.
8. It reaches the rear end surface of the small plunger 5 through the tower passage 7, is bridged between the rear end surface of the small plunger 5 and the front end surface of the stationary main body 1, flows into the stationary main passage 16, and then flows into the stationary A port 14. At this time, the high pressure oil supplied to the rotation A port 9 is discharged from the working liquid pressure. Oil pressure balance appropriately determined by rotation speed. The large plunger 3, especially the small plunger 5, is brought into contact with the front end surface of the stationary body 1 with appropriate pressure contact force with a contact surface pressure, and on the other hand, when high pressure oil is supplied through the rotation B port 12, high pressure is generated. The oil flows between the large-diameter sliding hole 10 and the stepped surface 11, passes through the rotating sub-passage 20, reaches the rear end surface of the large plunger 3, and reaches the rear end surface of the large plunger 3 and the front end of the stationary body 1. The high-pressure oil supplied to the rotating B port 12 is bridged with the surface, flows into the stationary sub passage 17, and is discharged from the stationary B port 15. Fluid pressure. Hydraulic balance appropriately determined by rotation speed. The large plunger 3 is brought into contact with the front end surface of the stationary body 1 with an appropriate contact force, and as the pressure of the high pressure oil increases, the contact force also increases,
This allows for more reliable and better bridging without oil leakage.

Furthermore, the hydraulic balance mentioned above. By optimizing the contact surface pressure, the thrust force on the bearing 21 can be suppressed, and the ultra-high pressure liquid can be more reliably bridgingly distributed.

In particular, since the plunger type is a combination of a large plunger 3 and a small plunger 5, an even more appropriate hydraulic balance can be achieved. Contact surface pressure can be obtained and it is extremely effective.

Also, contrary to this embodiment, even if the rotating body 2 is connected to the stationary side member and the stationary body 1 is connected to the rotating side member,
Moreover, even if the flow direction of the liquid is reversed, exactly the same effect can be obtained, which is extremely effective.

As described above, according to the present invention, ultra-high pressure liquid can be
Ensures no leakage of passing objects from the stationary side member to the rotating side member or from the rotating side member to the stationary side member. The present invention provides a rotary joint for ultra-high pressure liquid that achieves excellent practical effects such as good bridging flow.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a longitudinal sectional view, and FIG. 2 is a longitudinal sectional view of the main part. 1...Stationary body, 2...Rotating body, 3...Large plunger, 4...Large pressure spring, 5...Small plunger, 6...Small pressure spring, 7...Communication path, 8...Small diameter portion Sliding hole, 9...Rotation A port, 10...Large diameter sliding hole, 11...Step surface part, 12...Rotation B port, 13...Stationary ring body, 14...Stationation A port,
15... Stationary B port, 16... Stationary main passage, 1
7... Stationary auxiliary passage, 18... Small plunger sliding hole, 19... Rotating main passage, 20... Rotating auxiliary passage.

Claims (1)

[Scope of utility model registration request] This is a system that bridges ultra-high pressure liquid such as oil or water from a stationary side member to a rotating side member or from a rotating side member to a stationary side member. A large plunger, which is slidable in the rotation center axis direction of the rotating body, is fitted into the rotating body and is biased by a press-fitting large spring with the rear end face abutting the front end face of the stationary body. , the large plunger is formed into a two-stage plunger with a small diameter portion at the front and a large diameter portion at the rear, and a small plunger that is slidable in the direction of the center axis of the large plunger within the large plunger, A small pressure spring is applied to the front end surface of the stationary body, and a communication passage is bored through the center axis of the small plunger, and communicates with the front part of the small diameter sliding hole of the large plunger. A rotating A port is formed in the rotating body, and a rotating B port is formed in the rotating body by communicating between the front part of the large-diameter sliding hole and the step surface of the large plunger, while the rear part of the stationary body A stationary A port and a stationary B port are formed in a stationary ring body externally fitted on the stationary body, a stationary main passage communicating between the stationary A port and the front end surface of the stationary body, and a stationary main passage that communicates the stationary B port and the front end of the stationary body. Stationary sub-passages communicating with the surfaces are bored in the stationary main body, and the rotation A port and the rear end surface of the small plunger are connected to the small plunger sliding hole. A rotating main passage that communicates with the communicating passage and a rotating sub passage communicating with the rotating B port and the rear end of the large plunger via the stepped surface are connected to the stationary main passage. A hole is formed in the large plunger facing the sub passage, and the large plunger. Pressure rear end surface area of small plunger and large plunger. The pressure contact force is balanced between the front end surface of the stationary body and the large plunger by adjusting the area difference between the front end surface area of the small plunger and the stepped surface area in accordance with the working pressure and rotational speed of the liquid. An ultra-high pressure liquid rotary joint characterized in that it is configured to be provided between the rear end surface of a small plunger and the rear end surface of a small plunger.