Combined double-end-face mechanical seal cooling water leakage detection device

Abstract

The utility model discloses a combined type double-end-face mechanical seal cooling water leakage detection device which comprises a cavity, a first impeller cavity and a second impeller cavity, the first impeller cavity and the second impeller cavity are arranged in the cavity, and the first impeller cavity and the second impeller cavity are respectively provided with a cooling water inlet and a cooling water outlet. A first impeller is rotatably arranged in the first impeller cavity, a second impeller is rotatably arranged in the second impeller cavity, a movable shaft assembly hole is formed in the position, between the first impeller cavity and the second impeller cavity, in the cavity, a movable shaft is arranged in the movable shaft assembly hole, one end of the movable shaft extends out of one end of the cavity, and the other end of the movable shaft extends out of the other end of the cavity. And a transparent observation cover is arranged on the outer wall of the cavity. The combined type double-end-face mechanical seal cooling water leakage detection device can accurately and rapidly detect whether the combined type double-end-face mechanical seal cooling water leaks into a medium or not, can also detect whether the medium leaks into the cooling water or not, and can be widely applied to the field of pipeline conveying equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline conveying equipment field especially is related to a combined double-end face mechanical seal cooling water leakage detection device. BACKGROUND

[0002] The combined double-end face mechanical seal is an advanced sealing system for rotating equipment (such as pumps, compressors, etc.), which is often used in the pipeline connection of chemical enterprises, and its core feature is to use two sets of single-end face mechanical seals in combination. When the combined double-end face mechanical seal is working, the high-speed rotation and friction between the sealing dynamic ring and the static ring will generate high temperature (up to more than 200 DEG C), which needs to be cooled by cooling water (or other isolation fluids such as lubricating oil, ethylene glycol solution, etc.). The cooling water circulates through the isolation cavity and carries away more than 70% of the friction heat.

[0003] With the continuous operation of the equipment, the sealing surface of the combined double-end face mechanical seal will leak cooling water into the medium due to wear, deformation and other reasons. The leakage of cooling water into the process medium in the pipeline will affect the purity of the process medium, and in severe cases, it will cause chemical reactions and explosions. The operator cannot observe the leakage. At present, in order to ensure safe production, enterprises generally ensure the normal operation of the equipment through regular shutdown maintenance, which not only wastes time and effort, but also affects the production efficiency of the enterprise due to high-frequency shutdown. Therefore, a detection device needs to be designed to detect the leakage of cooling water in the combined double-end face mechanical seal into the medium in a timely manner. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a combined double-end face mechanical seal cooling water leakage detection device to solve the problems in the background.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a combined double-end mechanical seal cooling water leakage detection device, including a cavity, a first impeller chamber and a second impeller chamber disposed within the cavity, both the first and second impeller chambers being provided with cooling water inlets and cooling water outlets, a rotatable first impeller rotatably disposed within the first impeller chamber, and a rotatable second impeller rotatably disposed within the second impeller chamber, a movable shaft assembly hole being provided within the cavity between the first and second impeller chambers, and a movable shaft being disposed within the movable shaft assembly hole. The movable shaft has a splined portion at one end in the first impeller chamber and a lead screw portion at one end in the second impeller chamber. Between the splined portion and the lead screw portion is a smooth rod portion adapted to the mounting hole of the movable shaft. The first impeller is sleeved on the splined portion and has a splined groove hole adapted to the splined portion. The second impeller is sleeved on the lead screw portion and has a threaded hole adapted to the lead screw portion. One end of the movable shaft extends out of one end of the cavity, and one end of the cavity has a movable shaft extension hole. The outer wall of the cavity is provided with a transparent observation cover covering the end of the movable shaft extending out of the cavity.

[0006] To prevent the first impeller and the second impeller from moving left and right, the thickness of the first impeller is adapted to the width of the first impeller chamber, and the thickness of the second impeller is adapted to the width of the second impeller chamber.

[0007] To facilitate observation of whether the movable axis moves and the direction of movement, the transparent observation cover is provided with size scale lines.

[0008] Preferably, the cavity is provided with a first locking component and a second locking component that can lock the first impeller and the second impeller.

[0009] To achieve locking, the first locking component includes a pin, the cavity has a pin hole adapted to the pin, one end of the pin has a screw, the cavity has a screw bracket, and the screw bracket has a screw hole adapted to the screw. The second locking component includes a second pin, the cavity has a second pin hole adapted to the second pin, and the structure of the second locking component is the same as that of the first locking component.

[0010] To facilitate timely monitoring of movement of the movable axis, an infrared monitor is also installed on the observation cover, and an alarm is connected to the infrared monitor.

[0011] Preferably, a countersunk hole for the movable shaft is provided at the other end of the transparent observation cover inside the cavity.

[0012] To prevent cooling water in the first impeller chamber and the second impeller chamber from leaking into each other through the movable shaft assembly hole, a first sealing ring adapted to the movable shaft is provided in the movable shaft assembly hole.

[0013] To prevent cooling water from leaking out from the first pin hole and the second pin, a second sealing ring adapted to the pin is provided in the pin hole.

[0014] The beneficial effects of this invention are as follows: This invention uses cooling water input from the combined double-end face mechanical seal to drive the first impeller to rotate, and cooling water output from the combined double-end face mechanical seal to drive the second impeller to rotate. The first impeller and the movable shaft rotate synchronously through a splined section and spline slot. When a leak occurs, the flow rate of cooling water input to the combined double-end face mechanical seal is not equal to the flow rate of cooling water output from the combined double-end face mechanical seal, causing a speed difference between the first and second impellers. The second impeller moves relative to the first impeller and the movable shaft on the lead screw section. The second impeller drives the movable shaft to move left and right through a threaded hole and the lead screw section. The movement of the movable shaft can be observed through a transparent observation cover to determine whether a leak of cooling water or medium has occurred. Simultaneously, the inclusion of an infrared monitor and alarm provides an automatic alarm function, enabling timely detection of leaks and preventing equipment failures and safety accidents caused by leaks, thus ensuring safe and stable production. Meanwhile, the first and second impellers can be locked in place by rotating the screw to prevent them from rotating. This prevents the first impeller and the second impeller from moving left and right due to the difference in speed caused by the flow difference between the first and second impeller chambers when the pipe is connected to the cooling water supply or when the pipe is removed.

[0015] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Fig. 1 This is a three-dimensional structural diagram of the present invention.

[0017] Fig. 2 This is a top horizontal sectional view of the present invention.

[0018] Fig. 3 This is a right-side sectional view of the first impeller chamber in this utility model.

[0019] Fig. 4 This is a right-side sectional view of the second impeller chamber in this utility model.

[0020] Fig. 5 This is a schematic diagram of the transparent observation cover in this utility model.

[0021] Fig. 6 This is a schematic diagram of the locking component in this utility model.

[0022] Fig. 7 This is a connection diagram for actual use of this utility model. Detailed Implementation

[0023] like Figs. 1 to 7 As shown, a combined double-end mechanical seal cooling water leakage detection device includes a horizontally arranged cylindrical cavity 1, with a support 19 at the bottom of the cavity 1. A first impeller chamber 11 and a second impeller chamber 12 are vertically arranged within the cavity from left to right. Both the first impeller chamber 11 and the second impeller chamber 12 are provided with cooling water inlets 13 and cooling water outlets 14. A first impeller 2 is rotatably arranged in the first impeller chamber 11, and a second impeller 3 is rotatably arranged in the second impeller chamber 12. Cooling water acts on the first blade 22 of the first impeller 2 and the second blade 32 of the second impeller 3, driving the first impeller 2 and the second impeller 3 to rotate. The first impeller chamber 11 and the second impeller chamber 12 have the same dimensions, and the first impeller 2 and the second impeller 3 have the same external dimensions and the same number of blades. The thickness of the first impeller 2 is adapted to the width of the first impeller chamber 11, and the thickness of the second impeller 3 is adapted to the width of the second impeller chamber 12. The first impeller 2 and the second impeller 3 are respectively limited by the left and right inner walls of the first impeller chamber 11 and the left and right side walls of the second impeller chamber 12, ensuring that the first impeller 2 and the second impeller 3 can only rotate around the axis and cannot move in the left and right directions.

[0024] A movable shaft assembly hole 15 is provided in the cavity between the first impeller chamber 11 and the second impeller chamber 12, and a movable shaft 4 is disposed in the movable shaft assembly hole 15. One end of the movable shaft 4 located in the first impeller chamber 11 is a spline portion 41, and the other end located in the second impeller chamber 12 is a lead screw portion 42. Between the spline portion 41 and the lead screw portion 42 is a smooth rod portion 43 that is adapted to the movable shaft assembly hole 15. The movable shaft 4 can rotate and slide left and right within the movable shaft assembly hole 15 through the smooth rod portion 43. The first impeller 2 is sleeved on the spline portion 41, and the first impeller 2 is provided with a spline groove 21 that matches the spline portion 41. The first impeller 2 rotates synchronously with the movable shaft 4 under the action of the spline portion 41 and the spline groove 21, and the movable shaft 4 can slide left and right in the spline groove 21 of the first impeller 2 through the spline portion 41. The second impeller 3 is sleeved on the lead screw portion 42, and the second impeller 3 is provided with a threaded hole 31 that matches the lead screw portion 42. When the second impeller 3 rotates relative to the movable shaft 4, the movable shaft 4 can be driven to move left and right through the interaction between the threaded hole 31 and the lead screw portion 42. The splined portion 41 of the movable shaft 4 extends out of one end of the cavity 1. One end of the cavity 1 is provided with a movable shaft extension hole 16 adapted to the splined portion 41. A transparent observation cover 5 is provided on the outer wall of the cavity 1, covering the end of the movable shaft 4 that extends out of the cavity 1. The opening of the transparent observation cover 5 is sealed to the cavity 1 and communicates with the first impeller chamber 11 through the movable shaft extension hole 16. During operation, the transparent observation cover 5 is also filled with coolant, and the left and right movement of the movable shaft 4 can be observed through the transparent observation cover 5. A movable shaft countersunk hole 18 is provided at the other end of the cavity 1 located at the transparent observation cover 5. When the movable shaft 4 moves to the right, its end can extend into the movable shaft countersunk hole 18.

[0025] To facilitate observation of the movement direction of the movable shaft 4, the transparent observation cover 5 is provided with a size scale line 51. In the initial state, the end of the movable shaft 4 is aligned with the starting scale line 511. To promptly detect whether there is a leak of cooling water or medium, the observation cover 5 is also provided with an infrared detector 7. The infrared detector 7 is connected to an alarm 8. When the infrared detector 7 detects movement of the movable shaft 4, it can transmit a signal to the alarm 8 to sound an alarm.

[0026] To prevent the movable shaft 4 from moving left and right when connecting to the pipeline to input cooling water and disassembling from the pipeline, thus causing the index of the movable shaft 4 on the dimensional scale line 51 to change, the cavity 1 is respectively provided with a first locking component 6 and a second locking component 9 to lock the first impeller 2 and the second impeller 3. The first locking component 6 includes a pin 61, and the cavity 1 is provided with a pin hole 17 adapted to the pin 61. One end of the pin 61 is provided with a screw 611, and the cavity 1 is provided with a screw bracket 62. The screw bracket 62 is provided with a screw hole 621 adapted to the screw 611, and the screw hole 621 is provided with threads. The structure of the second locking component 9 is the same as that of the first locking component 6. Before connecting the pipeline to input cooling water, and before disassembling the present invention from the pipeline, the screw 611 is rotated to move the pin 61 towards the left side wall of the first impeller 2 and abut against and lock it. Then, the screw 611 is rotated to move the pin 61 towards the right side wall of the second impeller 3 and abut against and lock it. This locks the first impeller 2 and the second impeller 3 so that the first impeller 2, the second impeller 3 and the movable shaft 4 do not rotate. Therefore, the second impeller 3 will not rotate relative to the first impeller 2 and the movable shaft 4, and the movable shaft 4 will remain stationary in the left and right directions, thus avoiding reading errors.

[0027] To prevent cooling water in the first impeller chamber 11 and the second impeller chamber 12 from leaking into each other through the movable shaft mounting hole 15, a first sealing ring 44 adapted to the movable shaft 4 is provided in the movable shaft mounting hole 15. To prevent cooling water from leaking out of the cavity 1 through the first pin hole 17, a second sealing ring 612 adapted to the first pin 61 is provided in the first pin hole 17.

[0028] The working principle of this utility model is as follows: During installation, the cooling water inlet 13 of the first impeller chamber 11 is connected to a first water inlet pipe 131, the cooling water outlet 14 of the first impeller chamber 11 is connected to the cooling water inlet pipe 201 of the combined double-end mechanical seal (hereinafter referred to as mechanical seal) 20, the cooling water inlet 13 of the second impeller chamber 12 is connected to the cooling water outlet pipe 202 of the mechanical seal, and the cooling water outlet 14 of the second impeller chamber 12 is connected to a second water outlet pipe 141. Cooling water is output from the circulation pipe under the action of the transfer pump, enters the first impeller chamber 11 from the first inlet pipe 131, flows counterclockwise in the first impeller chamber 11 and drives the first impeller 2 to rotate counterclockwise, and then exits from the cooling water outlet 14 of the first impeller chamber 11. It enters the mechanical seal through the cooling water inlet pipe 201. After absorbing heat, the cooling water exits from the cooling water outlet pipe 202 of the mechanical seal and enters the second impeller chamber 12 from the cooling water inlet 13. The cooling water flows counterclockwise in the second impeller chamber 12 and drives the second impeller 3 to rotate counterclockwise. Finally, it exits from the cooling water outlet 14 of the second impeller chamber 12 and returns to the circulation pipe through the second outlet pipe 141 for cooling and temperature reduction.

[0029] The principle of this invention for determining leakage is as follows: When the input and output of cooling water in the mechanical seal are equal, the cooling water flow rates in the first impeller chamber 11 and the second impeller chamber 12 are the same. Therefore, the first impeller 2 and the second impeller 3 rotate at the same speed under the action of the water flow. At this time, the first impeller 2, the second impeller 3, and the movable shaft 4 rotate synchronously counterclockwise, remaining relatively stationary. The movable shaft 4 remains stationary in the left-right direction, indicating that the mechanical seal is operating normally without leakage. When the input of cooling water in the mechanical seal is greater than the output, the cooling water flow rate in the first impeller chamber 11 is greater than the cooling water flow rate in the second impeller chamber 12. Therefore, the speed of the first impeller 2 is greater than the speed of the second impeller 3. At this time, the first impeller 2 and the movable shaft 4 rotate synchronously. When the mechanical seal's cooling water input is less than its output, the cooling water flow rate in the first impeller chamber 11 is less than that in the second impeller chamber 12. Therefore, the rotational speed of the first impeller 2 is less than that of the second impeller 3. At this time, the first impeller 2 and the movable shaft 4 rotate synchronously, while the second impeller 3 rotates counterclockwise relative to the first impeller 2 and the movable shaft 4. Under the action of the screw thread 31 pressing the screw thread 42 to the left, it drives the movable shaft 4 to the left, indicating that the medium inside the mechanical seal has leaked into the cooling water. This invention can accurately and quickly detect whether cooling water has leaked into the medium, and also accurately and quickly detect whether the medium has leaked into the cooling water.

[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A combined double mechanical seal cooling water leakage detection device, characterized in that: The utility model provides a kind of cooling water cooling device, including cavity (1), first impeller chamber (11) and second impeller chamber (12) being arranged in cavity, cooling water inlet (13) and cooling water outlet (14) are arranged on the first impeller chamber (11) and second impeller chamber (12), rotatable first impeller (2) is arranged in the first impeller chamber (11), rotatable second impeller (3) is arranged in the second impeller chamber (12), movable shaft assembly hole (15) is arranged between the first impeller chamber (11) and the second impeller chamber (12) in the cavity, movable shaft (4) is arranged in the movable shaft assembly hole (15), the one end of movable shaft (4) is spline part (41) in the first impeller chamber (11), the one end is screw rod part (42) in the second impeller chamber (12), between spline part (41) and screw rod part (42) it is light pole part (43) with movable shaft assembly hole (15) adaptation, first impeller (2) is sleeved on spline part (41), and first impeller (2) is provided with spline slot hole (21) with spline part (41) adaptation, second impeller (3) is sleeved on screw rod part (42), and second impeller (3) is provided with screw hole (31) with screw rod part (42) adaptation, one end of movable shaft (4) is stretched out from one end of cavity (1), one end of cavity (1) is provided with movable shaft stretch-out hole (16), the outer wall of cavity (1) is provided with transparent observation cover (5) that stretches out one end of cavity (1) of movable shaft (4).

2. The combined double mechanical seal cooling water leakage detection device of claim 1, wherein: The thickness of the first impeller (2) is adapted to the width of the first impeller chamber (11), and the thickness of the second impeller (3) is adapted to the width of the second impeller chamber (12).

3. The combined double mechanical seal cooling water leakage detection device of claim 1, wherein: The transparent observation cover (5) is provided with a size scale line (51).

4. The combined double mechanical seal cooling water leakage detection device of claim 1, wherein: The cavity (1) is respectively provided with a first locking assembly (6) and a second locking assembly (9) for locking the first impeller (2) and the second impeller (3).

5. The combined double mechanical seal cooling water leakage detection device of claim 4, wherein: The first locking assembly (6) includes a latch (61), and the cavity (1) is provided with a latch hole (17) adapted to the latch (61). One end of the latch (61) is provided with a screw rod (611), and the cavity (1) is provided with a screw rod support (62). The screw rod support (62) is provided with a screw rod hole (621) adapted to the screw rod (611). The second locking assembly (9) has the same structure as the first locking assembly (6).

6. The combined double mechanical seal cooling water leakage detection device of claim 1, wherein: The observation cover (5) is further provided with an infrared monitor (7), and the infrared monitor (7) is connected with an alarm (8).

7. The combined double mechanical seal cooling water leakage detection device of claim 1, wherein: The cavity (1) is provided with a movable shaft avoiding sink hole (18) at the other end of the transparent observation cover (5).

8. The combined double mechanical seal cooling water leakage detection device of claim 1, wherein: The movable shaft assembly hole (15) is provided with a first sealing ring (44) adapted to the movable shaft (4).

9. The combined double mechanical seal cooling water leakage detection device of claim 5, wherein: The latch hole (17) is provided with a second sealing ring (612) adapted to the latch (61).

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