Internal leakage monitoring device for multi-channel swivel joint

Abstract

The invention relates to an internal leakage monitoring device for a multi-channel swivel joint. The internal leakage monitoring device comprises a shell and an action core, the action core is arranged in the shell and can move between a first position and a second position in the shell; an oil inlet is formed in the shell, and a monitoring cavity is formed in the shell; a through hole is formed in the action core; the shell is provided with an observation window, and the liquid amount in the monitoring cavity can be obtained through the observation window; and the action core is also linked with an alarm indication rod. According to the internal leakage monitoring device for the multi-channel swivel joint, in the state that the medium leakage amount is low, the leaked medium directly flows through the through hole, can be observed and then is discharged through the monitoring opening of the device; and when the leakage amount of the medium between the channels is large, the sealing medium is prevented from continuing to leak, so that the equipment function is temporarily maintained, and meanwhile, conditions are created for preparing for maintenance before the equipment function fails.

Description

Technical Field

[0001] The present invention relates to a multi-channel rotary joint internal leakage monitoring device, belonging to the technical field of mechanical equipment. Background Art

[0002] Taking the metallurgical industry as an example, the rotary joint of the continuous casting machine turntable undertakes the transportation of many media such as hydraulic pressure, lubrication, compressed air, and argon. The number of its channels ranges from more than a dozen to more than twenty according to the differences in equipment design. These working media directly affect the main functions and accuracy of the equipment. Since the rotary joint is often located in the central area of the rotating equipment, it is difficult for personnel to approach for equipment status inspection considering safety factors during equipment operation. The leakage inspection ports (sealing and lubrication ports) of these equipment are usually in a closed state. For equipment that is continuously working or in a production condition for a long time, there is a lack of necessary means for monitoring the equipment status. Often when the actuator of the equipment has abnormal actions, a large amount of internal leakage has occurred in the rotary joint, and emergency replacement of the equipment is required. The spare parts manufacturing cycle of large rotary joint equipment is generally very long, and the replacement difficulty is relatively large, which is extremely likely to have a great impact on the equipment operation. Therefore, for a rotary joint such as a rotating equipment, the effectiveness of the seal between each channel is crucial, directly affecting the stable and reliable transmission of the transported medium, the precise control of the actuator, and the normal operation of the main equipment. Therefore, how to effectively monitor the leakage status between the channels of the rotary joint, evaluate and judge the equipment status in advance, and avoid losses caused by functional failures is the need for equipment maintenance and also the need for realizing intelligent monitoring and remote operation and maintenance of the equipment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the above-mentioned technical drawbacks and provide a monitoring device that is connected to the leakage observation hole or the sealing and lubrication hole of a multi-channel rotary joint to observe the leakage condition.

[0004] To solve the above technical problem, the technical solution proposed by the present invention is: a multi-channel rotary joint internal leakage monitoring device, including: a housing and an action core; the action core is placed inside the housing and can move between a first position and a second position inside the housing; the housing has an oil inlet and a monitoring chamber inside; the action core has a through hole; when the action core is in the first position, the through hole communicates the oil inlet with the monitoring chamber; when the action core is in the second position; the through hole is closed by the housing; the housing has an observation window, and the liquid volume in the monitoring chamber can be obtained through the observation window; the action core is also linked with an alarm indicating rod; when the action core is in the second position, the end of the alarm indicating rod protrudes outside the housing; A spring is installed between the housing and the action core, and the spring has a tendency to push the action core to move from the second position to the first position; According to the formula: , where Q is the allowable leakage rate, C d is the flow coefficient; α is the through-hole area; ρ is the density of the liquid flowing through the through-hole; Δp is the pressure difference across the moving core; Δp is calculated; Then, according to the formula: K·x = Δp·s, where: K is the spring stiffness coefficient; x is the moving stroke of the moving core; s is the area of one end of the moving core facing the oil inlet; the spring stiffness coefficient is determined.

[0005] A further improvement of the above solution is that: the flow coefficient C d takes a value from 0.62 to 0.63.

[0006] A further improvement of the above solution is that: the opening of the through-hole facing the monitoring cavity is located on an inclined surface of the moving core; a coaxial sealing step matching the shape of the inclined surface is provided in the housing; when the moving core is in the second position, the slope is close to the inclined surface, thereby closing the through-hole.

[0007] A further improvement of the above solution is that: the observation window is a graduated glass tube.

[0008] A further improvement of the above solution is that: the glass tube is hollow, and the alarm indicating rod is placed therein. When the moving core is in the second position, the end of the alarm indicating rod protrudes outside the glass tube.

[0009] A further improvement of the above solution is that: the observation window is a number of proximity switches arranged in sequence. The proximity switches are connected to a display device. When the liquid reaches different proximity switches, the display device displays different contents.

[0010] The multi-channel rotary joint internal leakage monitoring device provided by the present invention can timely detect and judge the internal leakage state of the device by continuously monitoring the rotary joint online; in the state of low medium leakage, the leakage medium directly flows through the through-hole and can be observed, and then is discharged through the monitoring port of the device; when the medium leakage between channels is large, when a certain flow rate of leakage medium passes through the through-hole, a pressure difference will be generated on the two end faces of the moving core. Finally, a line seal is formed by the contact between the upper conical surface of the moving core and the housing to cut off the external leakage channel of the leakage medium, and at the same time, a signal is sent. In this state, the sealing medium avoids continuous leakage, which not only helps to temporarily maintain the device function, but also creates conditions for making repair preparations before the device function fails, reflecting the practical application significance of the present invention; for the working condition of non-continuous medium transportation with a large amount of internal leakage, when the medium is cut off by the control system, the pressure begins to drop. When the acting force generated by the pressure difference across the monitoring valve core is lower than the thrust of the return spring, the moving core begins to descend and resets to the original state. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present invention.

[0012] Figure 2 is Figure 1 a schematic structural diagram of the moving core in

[0013] Figure 3 It is a schematic structural diagram of the present invention after being enclosed in a preferred embodiment. Embodiment

[0014] Embodiment: The multi-channel rotary joint internal leakage monitoring device of this embodiment, as Figure 1 shown, includes: a housing and a moving core 4; the housing is composed of an upper housing 1 and a lower housing 6, and a sealing ring 3 is used for sealing at the contact position. The moving core 4 is placed inside the housing and can move between a first position and a second position inside the housing; the housing has an oil inlet 5 and an internal monitoring cavity 8, and the oil inlet 5 is connected to the through pipe joint or hose of the rotary joint to be monitored; the moving core 4 has a through hole 11; when the moving core 4 is in the first position, the through hole 10 connects the oil inlet 5 with the monitoring cavity 8; when the moving core 4 is in the second position; the through hole 10 is closed by the housing; the housing has an observation window 9, and the volume quantity of the leakage medium introduced from the monitoring cavity 8 can be detected through the observation window 9; the moving core 4 is also linked with an alarm indicating rod 12; when the moving core 4 is in the second position, the end of the alarm indicating rod 12 protrudes outside the housing.

[0015] A spring 3 is installed between the housing and the moving core 4. The spring 3 has a tendency to push the moving core 4 to move from the second position to the first position and has a reset function.

[0016] Damping hole components with different pore diameters can be installed in the through hole 10. The damping holes 11 with different pore diameters also adjust the passable pore diameter size of the through hole 10, so as to adapt to more working conditions.

[0017] When there is leakage between the two channels of the rotary joint, the leakage medium passes through the oil inlet 5 and enters the monitoring cavity 8 through the damping orifice plate 11. When the medium flows through the damping orifice plate 11, according to the formula: , where Q is the allowable leakage amount, C d is the flow coefficient; α is the through hole area; ρ is the liquid density flowing through the through hole; Δp is the pressure difference at both ends of the moving core 4; calculate to obtain Δp; the flow coefficient selects different values according to different liquid media. In this embodiment, C d is taken as 0.62 to 0.63 according to conventional hydraulic oil.

[0018] Then according to the formula: K·x = Δp·s, where: K is the spring stiffness coefficient; x is the moving stroke of the moving core 4; s is the area of one end of the moving core 4 facing the oil inlet; determine the spring stiffness coefficient.

[0019] In this way, a spring with an appropriate stiffness coefficient K can be selected according to the allowable leakage amount. Similarly, different leakage amount detection requirements can be met by selecting two parameters, namely, the diameter of the damping hole, i.e., the through-hole area α. According to actual needs, the damping holes can also be symmetrically or evenly distributed on the moving core 4 to reduce the influence of the hydraulic force on the moving core 4. When the leakage amount does not exceed the allowable leakage amount, the moving core 4 is in the first position under the action of the spring 2. When the pressure difference generated by a small amount of liquid medium flowing through the damping hole 11 is not sufficient to compress the spring and move the moving core to the second position, the liquid medium flows into the monitoring chamber 8 from the oil inlet 5, and the liquid amount can be seen through the observation window 9. Once the leakage amount of the equipment exceeds the allowable range, the pressure difference generated by flowing through the damping hole 11 pushes the spring 2 to compress, and the moving core 4 moves to the second position, as Figure 3 shown; a line seal is formed between the housing 1 and the moving core 4, and the medium flowing through the damping hole 11 will be sealed and cannot enter the monitoring chamber 8; at this time, the leaking liquid medium no longer flows in the monitoring device, and the pressure generated by it becomes a static pressure and directly acts on the lower surface of the moving core 4. The area within the diameter d of the upper surface of the moving core 4 is directly connected to the monitoring chamber 8 in a non-pressure state. Under the action of the pressure difference between the upper and lower surfaces, the moving core 4 maintains a sealed state with the housing 1, thus safely and effectively preventing the leakage of the leaked oil to the outside; the end of the alarm indicating rod 12 linked to the moving core 4 protrudes to give a warning. The end is painted with a bright color, so as to facilitate the identification of its warning. When the set leakage amount is exceeded, it indicates that there is a large internal leakage or seal failure in the detection hole of the rotary joint.

[0020] As Figure 2 shown, in order to better achieve the closing effect when the allowable leakage amount is exceeded, the opening of the through-hole 10 facing the monitoring chamber 8 is located on the conical slope of the moving core 4, below the sealing line between it and the housing 1; there is a circular step coaxial with the moving core 4 inside the housing; when the moving core 4 is in the second position, the step is close to the slope, thus closing the through-hole. This closing method is a line closing, and the effect is better.

[0021] In this embodiment, the observation window 9 is a glass tube measuring tool with scales. The glass tube is hollow, and the alarm indicating rod 12 is placed therein. When the moving core 4 is in the second position, the end of the alarm indicating rod protrudes outside the glass tube. By regularly checking the increase in the oil amount inside the glass tube measuring tool, the leakage amount between the holes and its change situation can be judged.

[0022] The observation window 9 can also adopt electronic detection elements. For example, a proximity switch for detecting the ejector rod of the moving core can be used to remotely judge whether there is a phenomenon of exceeding the leakage amount by whether the proximity switch sends a signal; an electronic flowmeter directly connected to the monitoring chamber 8 can be used to remotely achieve remote continuous monitoring of a lower leakage amount; therefore, different equipment state detection means and objectives can be achieved through different detection elements.

[0023] For the rotary joint channels in a non - continuous working state, the leakage volume inside the channels is directly related to the pressure of the medium inside the channels. When the medium inside the channels is cut off or the pressure is very low, under the action of the spring 2, the actuating core 4 can be reset, and at this time the entire monitoring device returns to its original state.

[0024] The present invention is not limited to the above - mentioned embodiments. Any technical solutions formed by equivalent substitution fall within the protection scope required by the present invention.

Claims

1. A multi-channel rotary joint internal leakage monitoring device, characterized in that, Comprising: A housing and an actuating core; the actuating core is disposed within the housing and is capable of moving between a first position and a second position within the housing; the housing has an oil inlet and a monitoring chamber inside; the actuating core has a through hole; when the actuating core is in the first position, the through hole communicates the oil inlet with the monitoring chamber; when the actuating core is in the second position, the through hole is closed by the housing; the housing has an observation window through which the liquid volume within the monitoring chamber can be obtained; the actuating core is also linked to an alarm indicating rod; when the actuating core is in the second position, the end of the alarm indicating rod protrudes outside the housing. A spring is installed between the housing and the actuating core, and the spring has a tendency to push the actuating core to move from the second position to the first position. According to the formula: , where Q is the allowable leakage rate, C d is the flow coefficient; α is the through-hole area; ρ is the density of the liquid flowing through the through-hole; Δp is the pressure difference across the moving core; calculate Δp; Then, according to the formula: K·x = Δp·s, where: K is the spring stiffness coefficient; x is the moving stroke of the actuating core; s is the area of the end of the actuating core facing the oil inlet, the spring stiffness coefficient is determined.

2. The multi-channel rotary joint internal leakage monitoring device according to claim 1, characterized in that: It is the flow coefficient C d The value ranges from 0.62 to 0.

63.

3. The multi-channel rotary joint internal leakage monitoring device according to claim 1, characterized in that: The opening of the through hole facing the monitoring chamber is located on an inclined surface of the actuating core; a coaxial sealing step matching the shape of the inclined surface is provided inside the housing; when the actuating core is in the second position, the slope is close to the inclined surface, thereby closing the through hole.

4. The multi-channel rotary joint internal leakage monitoring device according to claim 1, characterized in that: The observation window is a graduated glass tube.

5. The multi-channel rotary joint internal leakage monitoring device according to claim 4, characterized in that: The glass tube is hollow, and the alarm indicating rod is disposed therein. When the actuating core is in the second position, the end of the alarm indicating rod protrudes outside the glass tube.

6. The multi-channel rotary joint internal leakage monitoring device according to claim 1, characterized in that: The observation window is a plurality of proximity switches arranged in sequence. The proximity switches are connected to a display device. When the liquid reaches different proximity switches, the display device displays different contents.

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