Single-end-face mechanical seal leak detection device

Abstract

The utility model relates to the technical field of mechanical seal leak detection, and discloses a single-end-face mechanical seal leak detection device, which comprises a detection box, a detection cavity and a pressure cavity are arranged in the detection box, detection assemblies are arranged on the top surface and the left side of the detection box, and each detection assembly comprises a driving rotating shaft arranged in the detection cavity. The top end of the rotating shaft penetrates and extends to the top surface of the detection box. The mechanical sealing element is installed on the outer wall of the rotating shaft, then oil liquid is input into the detection cavity, gas is input into the pressure cavity, when the mechanical sealing element leaks, the gas in the pressure cavity leaks into the detection cavity from the mechanical sealing element under the action of high pressure, bubbles are formed in the oil liquid in the detection cavity, and then the mechanical sealing element is detected. In the detection process, the rotating shaft can be driven to rotate, so that the moving ring of the mechanical sealing element rotates, the working state of the mechanical sealing element is simulated, and the mechanical sealing element can be detected in dynamic and static states at the same time.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal leak detection technology, and in particular to a single-end mechanical seal leak detection device. Background Technology

[0002] Single-end mechanical seals are commonly used in fluid equipment to prevent leakage of the working medium. However, leaks may occur at the seal due to long-term operation or improper installation, requiring timely detection and maintenance. Therefore, designing an efficient and convenient leak detection device for single-end mechanical seals is of great significance.

[0003] An existing single-end mechanical seal leak detection device (publication number: CN221037856U) has at least the following drawbacks: In actual use, this device can only perform sealing performance testing on mechanical seals under static conditions. However, mechanical seals are usually accompanied by dynamic conditions such as rotation, vibration and temperature changes in actual working environments. Static testing cannot reflect the influence of these factors on sealing performance, resulting in deviations between test results and actual working conditions. Therefore, this utility model is proposed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a single-end mechanical seal leak detection device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A single-end mechanical seal leak detection device includes a detection box. The detection box has two cavities, an upper and a lower detection chamber and a pressure chamber. Detection components are provided on the top and left sides of the detection box. Each detection component includes a drive shaft disposed inside the detection chamber. The top end of the shaft extends through to the top surface of the detection box. A mechanical seal is installed on the outer wall of the shaft. A pull plate is rotatably connected to the outer wall of the shaft. A square rod is slidably disposed on the top end of the shaft. An air pump and a gear pump are respectively disposed on the left side of the detection box.

[0007] As a further embodiment of this utility model, a mounting plate is fixed on the left side of the testing box, and both the air pump and the gear pump are fixed on the top surface of the mounting plate. An air valve is installed at one end of the air pump's inflation pipe, and one end of the air valve is fixed to the left side of the testing box and communicates with the inside of the pressure chamber. An oil valve is installed at the oil supply pipe end of the gear pump, and one end of the oil valve is fixed to the left side of the testing box and communicates with the testing chamber. An oil tank is provided on the left side of the gear pump, and one end of the gear pump's oil suction pipe extends through to the bottom surface of the inside of the oil tank.

[0008] As a further embodiment of this utility model, a mounting frame is fixed on the top surface of the testing box, and a drive motor and an electric push rod are respectively fixed on the top surface of the mounting frame. The output shaft of the drive motor is fixed to the top end of the square rod, the bottom end of the telescopic rod of the electric push rod is fixed to the top surface of the pull plate, and a limit rod is fixed on the top surface of the pull plate. The limit rod is slidably inserted into the bottom surface of the mounting frame.

[0009] As a further embodiment of this utility model, the inner bottom surface of the detection chamber is provided with a countersunk hole that communicates with the pressure chamber. Several locking blocks are fixed on the inner bottom surface of the countersunk hole. The locking blocks are adapted to and engaged with the locking groove on the bottom surface of the stationary ring of the mechanical seal. The pressure ring of the mechanical seal is detachably installed to the outer wall of the drive shaft by bolts.

[0010] As a further embodiment of this utility model, a sealing cover is connected to the front side of the detection chamber via a hinge. The sealing cover is locked to the detection box via a snap fastener. Both the sealing cover and the detection box are made of transparent material, and a sealing ring is fixed at the contact point between the sealing cover and the detection box.

[0011] As a further embodiment of this utility model, a pressure sensor is fixed on the left side of the detection box, and the detection end of the pressure sensor extends into the interior of the pressure chamber. A PLC controller is fixed on the front side of the detection box. The air pump, gear pump, drive motor, electric push rod and pressure sensor are all electrically connected to the PLC controller.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By installing the mechanical seal on the outer wall of the rotating shaft, oil is then introduced into the detection chamber and gas into the pressure chamber. When the mechanical seal leaks, the gas in the pressure chamber leaks from the mechanical seal into the detection chamber under high pressure, forming bubbles in the oil in the detection chamber. During the detection process, the rotating shaft can also be driven to rotate, causing the rotating ring of the mechanical seal to rotate, simulating the working state of the mechanical seal. This allows for simultaneous detection of the mechanical seal in both static and dynamic states, effectively preventing the mechanical seal from being affected by dynamic conditions such as rotation, vibration, and temperature changes in the actual working environment. This avoids the problem that single static testing cannot reflect the impact of these factors on the sealing performance, leading to deviations between the test results and actual working conditions. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a single-end mechanical seal leak detection device proposed in this utility model;

[0015] Figure 2 This is a three-dimensional disassembled structural diagram of a single-end mechanical seal leak detection device proposed in this utility model;

[0016] Figure 3This is a three-dimensional sectional view of the detection box of a single-end mechanical seal leak detection device proposed in this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the countersunk hole of a single-end mechanical seal leak detection device proposed in this utility model.

[0018] In the diagram: 1. Detection box; 101. Detection chamber; 102. Pressure chamber; 2. Rotating shaft; 201. Mechanical seal; 202. Pull plate; 203. Square rod; 204. Air pump; 205. Gear pump; 206. Mounting plate; 207. Oil tank; 208. Mounting bracket; 209. Drive motor; 210. Electric push rod; 211. Limiting rod; 3. Countersunk hole; 301. Locking block; 4. Sealing cover; 5. Air pressure sensor. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1-4As shown, a single-end mechanical seal leak detection device includes a detection box 1. The detection box 1 has two cavities, an upper and a lower detection chamber 101 and a pressure chamber 102. Detection components are provided on the top and left sides of the detection box 1. The detection components include a drive shaft 2 disposed inside the detection chamber 101. The top end of the shaft 2 extends through to the top surface of the detection box 1. A mechanical seal 201 is installed on the outer wall of the shaft 2. A pull plate 202 is rotatably connected to the outer wall of the shaft 2. A square rod 203 is slidably disposed on the top end of the shaft 2. An air pump 204 and a gear pump 205 are respectively disposed on the left side of the detection box 1.

[0023] like Figures 2-4 As shown, in this embodiment, a mounting plate 206 is fixed to the left side of the detection box 1. Both the air pump 204 and the gear pump 205 are fixed to the top surface of the mounting plate 206. An air valve is installed at one end of the air pump 204's inflation pipe, and one end of the air valve is fixed to the left side of the detection box 1 and communicates with the inside of the pressure chamber 102. An oil valve is installed at the end of the gear pump 205's oil supply pipe, and one end of the oil valve is fixed to the left side of the detection box 1 and communicates with the detection chamber 101. An oil tank 207 is provided on the left side of the gear pump 205. One end of the 205 oil extraction pipe extends through to the bottom of the oil tank 207. By opening the gear pump 205 and the oil valve, oil is drawn from the oil tank 207 and input into the detection chamber 101. After reaching a certain water level, the oil valve is closed, the air pump 204 and the air valve are opened, and gas is input into the pressure chamber 102 to increase the air pressure inside the pressure chamber 102. Then, it is observed whether bubbles are continuously generated inside the detection chamber 101. If there is no abnormality, the sealing test of the mechanical seal 201 under static conditions is completed.

[0024] like Figures 2-4 As shown in this embodiment, a mounting bracket 208 is fixed to the top surface of the test box 1. A drive motor 209 and an electric push rod 210 are fixed to the top surface of the mounting bracket 208. The output shaft of the drive motor 209 is fixed to the top end of the square rod 203. The bottom end of the telescopic rod of the electric push rod 210 is fixed to the top surface of the pull plate 202. A limit rod 211 is fixed to the top surface of the pull plate 202. The limit rod 211 is slidably inserted into the bottom surface of the mounting bracket 208. By starting the drive motor 209, the square rod 203 and the rotating shaft 2 are rotated, thereby causing the rotating ring of the mechanical seal 201 to rotate, simulating the working state of the mechanical seal 201. If there is no abnormality, the sealing test of the mechanical seal 201 under dynamic conditions is completed. Thus, the mechanical seal 201 can be tested in both dynamic and static states at the same time. This effectively prevents the mechanical seal 201 from being subjected to dynamic conditions such as rotation, vibration, and temperature changes in the actual working environment, which would cause the single static test to fail to reflect the influence of these factors on the sealing performance, resulting in a deviation between the test results and the actual working conditions.

[0025] like Figures 2-4As shown, in this embodiment, the inner bottom surface of the detection chamber 101 is provided with a countersunk hole 3 that communicates with the pressure chamber 102. Several locking blocks 301 are fixed to the inner bottom surface of the countersunk hole 3. The locking blocks 301 are adapted to and engaged with the groove on the bottom surface of the stationary ring of the mechanical seal 201. The pressure ring of the mechanical seal 201 is detachably installed to the outer wall of the drive shaft 2 via bolts. By pressing the stationary ring of the mechanical seal 201 into the countersunk hole 3, the locking blocks 301 engage with the bottom surface of the stationary ring of the mechanical seal 201. The groove adapter is snapped in place, and then the mechanical seal 201 pressure ring is detachably installed to the outer wall of the rotating shaft 2 by bolts. Then, the electric push rod 210 is activated to drive the rotating shaft 2 downward, so that the bottom end of the rotating shaft 2 passes through the countersunk hole 3 and extends into the interior of the pressure chamber 102. During this process, the rotating shaft 2 slides on the outer wall of the square rod 203. At this time, the stationary ring and the moving ring of the mechanical seal 201 abut against each other to achieve a seal, thereby allowing the mechanical seal 201 to be installed on the rotating shaft 2, simulating the normal working environment of the mechanical seal 201.

[0026] like Figures 2-4 As shown, in this embodiment, the front side of the detection chamber 101 is connected to a sealing cover 4 via a hinge. The sealing cover 4 is locked to the detection box 1 via a buckle. Both the sealing cover 4 and the detection box 1 are made of transparent material. A sealing ring is fixed at the contact point between the sealing cover 4 and the detection box 1. The sealing cover 4 facilitates the disassembly and assembly of the mechanical seal 201 and the testing by the staff.

[0027] like Figures 2-4 As shown, in this embodiment, a pressure sensor 5 is fixed on the left side of the detection box 1. The detection end of the pressure sensor 5 extends into the interior of the pressure chamber 102. A PLC controller is fixed on the front side of the detection box 1. The air pump 204, gear pump 205, drive motor 209, electric push rod 210 and pressure sensor 5 are all electrically connected to the PLC controller. By setting the pressure sensor 5, the pressure chamber 102 can be controlled to adjust the internal air pressure, thereby simulating different working conditions and increasing the detection accuracy.

[0028] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: In use, the sealing cover 4 is opened, and the stationary ring of the mechanical seal 201 is pressed into the countersunk hole 3, so that the locking block 301 and the bottom groove of the stationary ring of the mechanical seal 201 are matched and engaged. Then, the pressure ring of the mechanical seal 201 is detachably installed to the outer wall of the rotating shaft 2 by bolts. Then, the electric push rod 210 is started to drive the rotating shaft 2 to move downward, so that the bottom end of the rotating shaft 2 passes through the countersunk hole 3 and extends into the pressure chamber 102. During this process, the rotating shaft 2 slides on the outer wall of the square rod 203. At this time, the stationary ring and the moving ring of the mechanical seal 201 abut against each other to achieve sealing. Then, the sealing cover 4 is closed, the gear pump 205 and the oil valve are opened, and the oil in the oil tank 207 is drawn and input into the detection chamber 101. After reaching a certain water level, the oil valve is closed, and the air pump 204 and the air valve are opened. Gas is introduced into the pressure chamber 102 to increase the internal air pressure. The air pressure sensor 5 monitors this in real time. When the air pressure reaches a certain value, the air pressure sensor 5 sends a signal to the PLC controller. The PLC controller controls the air pump 204 to stop filling and close the air valve. Then, it is observed whether bubbles are continuously generated inside the detection chamber 101. If there is no abnormality, the drive motor 209 is started to drive the square rod 203 and the rotating shaft 2 to rotate, thereby driving the rotating ring of the mechanical seal 201 to rotate, simulating the working state of the mechanical seal 201. This allows for simultaneous detection of the mechanical seal 201 in both dynamic and static states, effectively preventing the mechanical seal 201 from being affected by dynamic conditions such as rotation, vibration, and temperature changes in the actual working environment. This prevents the single static test from failing to reflect the influence of these factors on the sealing performance, resulting in deviations between the test results and the actual working conditions.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A single-end mechanical seal leak detection device, comprising a detection box (1), characterized in that, The inside of the test box (1) has two cavities, an upper and lower chamber, a test chamber (101) and a pressure chamber (102). The top and left sides of the test box (1) are provided with test components. The test components include a drive shaft (2) set inside the test chamber (101). The top end of the shaft (2) extends through to the top surface of the test box (1). A mechanical seal (201) is installed on the outer wall of the shaft (2). A pull plate (202) is rotatably connected to the outer wall of the shaft (2). A square rod (203) is slidably set on the top end of the shaft (2). An air pump (204) and a gear pump (205) are respectively set on the left side of the test box (1).

2. The single-end mechanical seal leak detection device according to claim 1, characterized in that, A mounting plate (206) is fixed on the left side of the test box (1). The air pump (204) and the gear pump (205) are both fixed on the top surface of the mounting plate (206). An air valve is installed at one end of the air pump (204)'s air inlet pipe. One end of the air valve is fixed to the left side of the test box (1) and communicates with the inside of the pressure chamber (102). An oil valve is installed at the oil delivery pipe end of the gear pump (205). One end of the oil valve is fixed to the left side of the test box (1) and communicates with the test chamber (101). An oil tank (207) is provided on the left side of the gear pump (205). One end of the gear pump (205)'s oil extraction pipe extends through to the bottom surface of the inside of the oil tank (207).

3. The single-end mechanical seal leak detection device according to claim 2, characterized in that, The top surface of the test box (1) is fixed with a mounting bracket (208). The top surface of the mounting bracket (208) is fixed with a drive motor (209) and an electric push rod (210). The output shaft of the drive motor (209) is fixed with the top end of the square rod (203). The bottom end of the telescopic rod of the electric push rod (210) is fixed with the top surface of the pull plate (202). The top surface of the pull plate (202) is fixed with a limit rod (211). The limit rod (211) is slidably inserted into the bottom surface of the mounting bracket (208).

4. The single-end mechanical seal leak detection device according to claim 3, characterized in that, The inner bottom surface of the detection chamber (101) is provided with a countersunk hole (3) that communicates with the pressure chamber (102). Several locking blocks (301) are fixed on the inner bottom surface of the countersunk hole (3). The locking blocks (301) are adapted to the locking groove on the bottom surface of the stationary ring of the mechanical seal (201). The pressure ring of the mechanical seal (201) is detachably installed on the outer wall of the drive shaft (2) by bolts.

5. A single-end mechanical seal leak detection device according to claim 4, characterized in that, The front side of the detection chamber (101) is connected to a sealing cover (4) via a hinge. The sealing cover (4) is locked to the detection box (1) via a buckle. Both the sealing cover (4) and the detection box (1) are made of transparent material. A sealing ring is fixed at the contact point between the sealing cover (4) and the detection box (1).

6. A single-end mechanical seal leak detection device according to claim 5, characterized in that, A pressure sensor (5) is fixed on the left side of the detection box (1). The detection end of the pressure sensor (5) extends into the pressure chamber (102). A PLC controller is fixed on the front side of the detection box (1). The air pump (204), gear pump (205), drive motor (209), electric push rod (210) and pressure sensor (5) are all electrically connected to the PLC controller.

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