Protective device for mechanical seal of slurry pump

Abstract

The embodiment of the utility model provides a protection device for a mechanical seal of a slurry pump, which comprises a water receiving tank, a water inlet of the water receiving tank is communicated with a water outlet pipe of the mechanical seal of the slurry pump, and the water receiving tank is used for receiving and accommodating cooling water discharged from a cooling water system of the mechanical seal of the slurry pump; the detection end of the liquid level detection unit is arranged in the water receiving tank, and the liquid level detection unit is used for outputting a first on-off signal according to the water level of the cooling water in the water receiving tank; the input end of the time delay unit is connected with the output end of the liquid level detection unit, the output end of the time delay unit is connected in series in a secondary loop of the protected equipment, and the time delay unit is used for outputting a second on-off signal in a time delay mode according to the first on-off signal so as to control starting and stopping of the slurry pump. According to the device, the problem of a cooling water system can be found in time and treated, so that the service life of the mechanical seal of the slurry pump is prolonged, the equipment consumption cost is reduced, and the equipment maintenance frequency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment engineering, in particular to a protective device for the mechanical seal of a slurry pump. Background Art

[0002] In recent years, with the rapid development and technological advancement of the coal washing industry, heavy medium separation (DMS) has been widely adopted in many coal preparation plants due to its high efficiency and environmentally friendly features. In this process, DMS (such as magnetite powder and ferrosilicon powder) and other materials are typically continuously and stably transported by slurry pumps to ensure smooth separation. As a key piece of equipment, the stability of the slurry pump's operating performance directly impacts the efficiency and safety of the entire coal washing production line.

[0003] Slurry pumps are typically equipped with double-face mechanical seals, a sophisticated sealing structure used to prevent leakage of high-pressure liquid within the pump, ensuring the safety and reliability of equipment operation. However, double-face mechanical seals generate a large amount of frictional heat during operation and must rely on a cooling water system for continuous cooling to maintain a suitable operating temperature and prevent overheating damage. Once the cooling water system experiences abnormalities such as blockage or interruption, the mechanical seal will rapidly heat up due to poor heat dissipation in a short period of time. In severe cases, this can cause the mechanical seal to fail, triggering liquid leakage from the grouting pump body, which not only affects the normal operation of the equipment, but can also cause environmental pollution, equipment damage, and even safety accidents. Currently, although many coal preparation plants attach great importance to the daily maintenance and fault monitoring of slurry pumps, conventional monitoring methods often make it difficult to promptly address mechanical seal overheating caused by abnormalities in the cooling water system. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the embodiment of the present invention proposes a protective device for the mechanical seal of a slurry pump, which can promptly detect and handle problems in the cooling water system, thereby increasing the service life of the mechanical seal of the slurry pump, reducing equipment consumption costs, and reducing the frequency of equipment maintenance.

[0006] To achieve the above-mentioned purpose, an embodiment of the present utility model proposes a protection device for the mechanical seal of a slurry pump, comprising: a water receiving trough, the water inlet of the water receiving trough is connected to the water outlet pipe of the mechanical seal of the slurry pump, the water receiving trough is used to receive and accommodate cooling water discharged from the cooling water system of the mechanical seal of the slurry pump; a liquid level detection unit, the detection end of the liquid level detection unit is arranged in the water receiving trough, the liquid level detection unit is used to output a first on-off signal according to the water level of the cooling water in the water receiving trough; a delay unit, the input end of the delay unit is connected to the output end of the liquid level detection unit, the output end of the delay unit is connected in series in the secondary circuit of the protected equipment, and the delay unit is used to delay the output of a second on-off signal according to the first on-off signal to control the start and stop of the slurry pump.

[0007] The protective device for the mechanical seal of a slurry pump according to the embodiment of the present invention includes a water receiving trough, a liquid level detection unit, a delay unit, and a protection unit; wherein the water inlet of the water receiving trough is connected to the water outlet pipe of the mechanical seal of the slurry pump, and the water receiving trough is used to receive and accommodate cooling water discharged from the cooling water system of the mechanical seal of the slurry pump; the detection end of the liquid level detection unit is arranged in the water receiving trough, and the liquid level detection unit is used to output a first on-off signal according to the water level of the cooling water in the water receiving trough; the input end of the delay unit is connected to the output end of the liquid level detection unit, and the output end of the delay unit is connected in series in the secondary circuit of the protected equipment, and the delay unit is used to output a second on-off signal after delaying according to the first on-off signal to control the start and stop of the slurry pump. Therefore, by designing a protective device for the mechanical seal of the slurry pump, problems in the cooling water system can be discovered and handled in a timely manner, thereby increasing the service life of the mechanical seal of the slurry pump, reducing equipment consumption costs, and reducing the frequency of equipment maintenance.

[0008] In addition, the protective device for the mechanical seal of the slurry pump proposed in the embodiment of the utility model may also have the following additional technical features:

[0009] According to one embodiment of the present invention, the protection device further comprises:

[0010] An alarm unit is connected to the liquid level detection unit and is used to send an alarm signal.

[0011] According to one embodiment of the present invention, the liquid level detection unit includes: a first electrode, a second electrode and a liquid level relay; wherein,

[0012] The first electrode and the second electrode are arranged on both sides of the interior of the water receiving tank, the first electrode is connected to the first electrode end of the liquid level relay via a first cable, and the second electrode is connected to the second electrode end of the liquid level relay via a second cable;

[0013] The first contact of the first target normally closed switch of the liquid level relay is respectively connected to the live wire end and the live wire of the liquid level relay, and the second contact of the first target normally closed switch is respectively connected to the delay unit and the alarm unit; wherein, the first target normally closed switch is a group of normally closed switches selected from the liquid level relay.

[0014] According to one embodiment of the present invention, the delay unit includes:

[0015] A time relay, wherein the live wire end of the time relay is connected to the second contact of the first target normally closed switch, the neutral wire end of the time relay is connected to the neutral wire end of the liquid level relay, the first contact of the second target normally closed switch of the time relay and the second contact of the second target normally closed switch are connected in series with the secondary circuit of the protected device; wherein the second target normally closed switch is a group of normally closed switches selected from the liquid level relay.

[0016] According to one embodiment of the present utility model, the alarm unit includes: an audible and visual alarm, the live wire end of the audible and visual alarm is respectively connected to the second contact of the first target normally closed switch and the live wire end of the time relay, and the neutral wire end of the audible and visual alarm is respectively connected to the neutral wire end of the liquid level relay and the neutral wire end of the time relay.

[0017] According to an embodiment of the present invention, a drain outlet with adjustable water volume is provided at the lower end of the water receiving trough.

[0018] According to one embodiment of the present invention, an overflow port is provided at a set height position of the water receiving trough.

[0019] According to an embodiment of the present invention, both the first electrode and the second electrode are graphite electrodes.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 It is a schematic diagram of a protective device for the mechanical seal of a slurry pump according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following describes the protective device for the mechanical seal of a slurry pump according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of a protective device for the mechanical seal of a slurry pump according to an embodiment of the utility model.

[0026] It should be noted that the slurry pump in the embodiment of the present invention may be a double-end mechanical seal slurry pump.

[0027] like Figure 1 As shown, the protective device for the mechanical seal of a slurry pump according to an embodiment of the present invention includes: a water receiving trough, a liquid level detection unit and a delay unit.

[0028] The water inlet of the water receiving trough is connected to the outlet pipe of the slurry pump's mechanical seal. The water receiving trough is used to receive and store cooling water discharged from the cooling water system of the slurry pump's mechanical seal. The detection end of the liquid level detection unit is located within the water receiving trough and is used to output a first on / off signal based on the cooling water level within the trough. The input end of the delay unit is connected to the output end of the liquid level detection unit, and the output end of the delay unit is connected in series to the secondary circuit of the protected equipment. The delay unit is used to delay the output of the first on / off signal to output a second on / off signal to control the start and stop of the slurry pump.

[0029] In this embodiment, when the cooling water level in the water receiving tank is higher than the set water level, the first on-off signal generated by the liquid level detection unit is an off signal, and the second on-off signal output by the delay unit is a closing signal. In this case, the slurry pump continues to operate. However, when the cooling water level in the water receiving tank is lower than the set water level, the first on-off signal generated by the liquid level detection unit is a closing signal, and the second on-off signal output by the delay unit after a set delay time, such as 30 seconds, is an off signal, thereby stopping the slurry pump.

[0030] Therefore, the utility model can timely discover and deal with problems in the cooling water system through the protection device designed for the mechanical seal of the slurry pump, thereby increasing the service life of the mechanical seal of the slurry pump, reducing equipment consumption costs, and reducing the frequency of equipment maintenance.

[0031] Next, continue to combine Figure 1 The protective device for the mechanical seal of a slurry pump according to an embodiment of the utility model is described.

[0032] like Figure 1As shown, the protection device for the mechanical seal of the slurry pump further includes: an alarm unit, which is connected to the liquid level detection unit and is used to send an alarm signal.

[0033] like Figure 1 As shown, the liquid level detection unit includes a first electrode, a second electrode, and a liquid level relay. The first and second electrodes are disposed on opposite sides of the water receiving tank. The first electrode is connected to the first electrode terminal of the liquid level relay via a first cable, and the second electrode is connected to the second electrode terminal of the liquid level relay via a second cable. The first contact of the first target normally closed switch of the liquid level relay is connected to the live wire terminal and the live wire of the liquid level relay, respectively. The second contact of the first target normally closed switch is connected to the delay unit and the alarm unit, respectively. The first target normally closed switch is a group of normally closed switches selected from the liquid level relay. Both the first and second electrodes can be graphite electrodes.

[0034] In practical applications, the first electrode end of the liquid level relay can be as follows Figure 1 The 5 or 6 terminal of the liquid level relay shown, the second electrode terminal of the liquid level relay can be as follows Figure 1 The 4-terminal of the liquid level relay shown in FIG. 1 and the first contact of the first target normally closed switch can be as follows: Figure 1 The first terminal of the liquid level relay shown in FIG1 and the second contact of the first target normally closed switch can be as follows Figure 1 The terminals of the liquid level relay are shown as follows: the live wire terminal of the liquid level relay is terminal 3, and the neutral wire terminal of the liquid level relay is terminal 9.

[0035] like Figure 1 As shown, the delay unit includes a time relay. The live terminal of the time relay is connected to the second contact of a first target normally closed switch, the neutral terminal of the time relay is connected to the neutral terminal of a liquid level relay, and the first contact of a second target normally closed switch of the time relay and the second contact of a second target normally closed switch are connected in series with the secondary circuit of the protected device. The second target normally closed switch is a set of normally closed switches selected from the liquid level relay.

[0036] It should be noted that the live wire end of the time relay is end 1, the neutral wire end of the time relay is end 2, the first contact of the second target normally closed switch is end 3 of the time relay, and the second contact of the second target normally closed switch is end 5 of the time relay.

[0037] like Figure 1 As shown, the alarm unit includes: an audible and visual alarm, the live wire end of the audible and visual alarm is respectively connected to the second contact of the first target normally closed switch and the live wire end of the time relay, and the neutral wire end of the audible and visual alarm is respectively connected to the neutral wire end of the liquid level relay and the neutral wire end of the time relay.

[0038] like Figure 1As shown, a drain outlet with adjustable water volume is provided at the lower end of the water receiving trough, and an overflow outlet is provided at a set height position of the water receiving trough, such as an overflow outlet of appropriate size at 2 / 3 of the height of the water receiving trough.

[0039] It should be noted that when the cooling water level in the water tank of the liquid level relay is higher than the set value, the first target normally closed switch is in the open state. When the cooling water level in the water tank of the liquid level relay is lower than the set value or the cooling water flow is interrupted, the first target normally closed switch switches from open to closed. When the time relay is without power supply, the second target normally closed switch is in the closed state. When power supply is provided, the second target normally closed switch switches from closed to open.

[0040] In practice, when the liquid level relay is not in use, the first target normally closed switch is in the normally closed state. After the liquid level relay is in use, if the liquid level relay detects that the cooling water level in the water tank is below the set value or the cooling water flow is interrupted, the first target normally closed switch is closed or switched from open to closed. At this time, the audible and visual alarm sounds an alarm signal, and the time relay is connected to the power supply, causing the time relay to start timing. After the inspection personnel hear the alarm signal, they check and resolve the problem. If the problem has not been resolved before the time relay reaches the set time, the second target normally closed switch in the time relay switches from normally closed to open and closed, controlling the protected equipment, such as the slurry pump, to stop operation. However, if the audible and visual alarm no longer sounds an alarm before the time relay reaches the set time, it indicates that the cooling water level problem in the water tank has been resolved. At this time, the first target normally closed switch is open, the second target normally closed switch is closed, and the slurry pump continues to operate.

[0041] In summary, the protection device for the mechanical seal of a slurry pump according to an embodiment of the present invention includes a water receiving trough, a liquid level detection unit, a delay unit, and a protection unit; wherein the water inlet of the water receiving trough is connected to the water outlet pipe of the mechanical seal of the slurry pump, and the water receiving trough is used to receive and accommodate cooling water discharged from the cooling water system of the mechanical seal of the slurry pump; the detection end of the liquid level detection unit is arranged in the water receiving trough, and the liquid level detection unit is used to output a first on-off signal according to the water level of the cooling water in the water receiving trough; the input end of the delay unit is connected to the output end of the liquid level detection unit, and the output end of the delay unit is connected in series in the secondary circuit of the protected equipment, and the delay unit is used to output a second on-off signal according to the first on-off signal to control the start and stop of the slurry pump. Therefore, by designing a protection device for the mechanical seal of the slurry pump, problems in the cooling water system can be discovered and handled in a timely manner, thereby increasing the service life of the mechanical seal of the slurry pump, reducing equipment consumption costs, and reducing the frequency of equipment maintenance.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A protective device for a mechanical seal of a slurry pump, characterized in that: include: A water receiving trough, the water inlet of which is connected to the water outlet pipe of the mechanical seal of the slurry pump, and the water receiving trough is used to receive and contain cooling water discharged from the cooling water system of the mechanical seal of the slurry pump; A liquid level detection unit, wherein a detection end of the liquid level detection unit is disposed in the water receiving tank, and the liquid level detection unit is used to output a first on-off signal according to the water level of the cooling water in the water receiving tank; A delay unit, wherein the input end of the delay unit is connected to the output end of the liquid level detection unit, the output end of the delay unit is connected in series in the secondary circuit of the protected equipment, and the delay unit is used to delay the output of the second on-off signal according to the first on-off signal to control the start and stop of the slurry pump.

2. The protective device for the mechanical seal of a slurry pump according to claim 1, characterized in that: The protection device also includes: An alarm unit is connected to the liquid level detection unit, and is used to send out an alarm signal.

3. The protective device for the mechanical seal of a slurry pump according to claim 1, characterized in that: The liquid level detection unit comprises: a first electrode, a second electrode and a liquid level relay; wherein, The first electrode and the second electrode are arranged on both sides of the inside of the water receiving tank, the first electrode is connected to the first electrode end of the liquid level relay by a first cable, and the second electrode is connected to the second electrode end of the liquid level relay by a second cable; The first contact of the first target normally closed switch of the liquid level relay is respectively connected to the live wire end and the live wire of the liquid level relay, and the second contact of the first target normally closed switch is respectively connected to the delay unit and the alarm unit; wherein, the first target normally closed switch is a group of normally closed switches selected from the liquid level relay.

4. The protective device for the mechanical seal of a slurry pump according to claim 1, characterized in that: The delay unit comprises: A time relay, wherein the live wire end of the time relay is connected to the second contact of the first target normally closed switch, the neutral wire end of the time relay is connected to the neutral wire end of the liquid level relay, the first contact of the second target normally closed switch of the time relay and the second contact of the second target normally closed switch are connected in series with the secondary circuit of the protected device; wherein the second target normally closed switch is a group of normally closed switches selected from the liquid level relay.

5. The protective device for the mechanical seal of a slurry pump according to claim 2, characterized in that: The alarm unit comprises: an audible and visual alarm, wherein the live wire end of the audible and visual alarm is respectively connected to the second contact of the first target normally closed switch and the live wire end of the time relay, and the neutral wire end of the audible and visual alarm is respectively connected to the neutral wire end of the liquid level relay and the neutral wire end of the time relay.

6. The protective device for the mechanical seal of a slurry pump according to claim 1, characterized in that: A drain outlet with adjustable water volume is provided at the lower end of the water receiving trough.

7. The protective device for the mechanical seal of a slurry pump according to claim 1, characterized in that: An overflow port is provided at a set height position of the water receiving trough.

8. The protective device for the mechanical seal of a slurry pump according to claim 3, characterized in that: The first electrode and the second electrode are both graphite electrodes.

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