A closed-loop circulation device for sealing water in a pump and motor seal

Abstract

This utility model relates to the field of chemical equipment technology, and in particular to a closed-loop circulation device for mechanical seals of pumps, including a demineralized water tank. One end of the demineralized water tank is connected to a water inlet pipe, and one side of the demineralized water tank is connected to a remote level gauge. A first circulation pump and a second circulation pump are located on the side of the demineralized water tank furthest from the remote level gauge. A heat exchanger is located behind the first and second circulation pumps. Each pump's mechanical seal box is located behind the demineralized water tank, and a return pipe is located on one side of each pump's mechanical seal box. The first circulation pump is connected to the demineralized water tank and the heat exchanger via a connecting pipe. The second circulation pump is connected to the first circulation pump and the heat exchanger via a connecting pipe. The heat exchanger is connected to each pump's mechanical seal box via a connecting pipe. In this utility model, demineralized water can be directly circulated in a closed loop without external discharge, carrying away the heat from the mechanical seals. This allows for cooling of the mechanical seals with a relatively small amount of demineralized water used for circulation.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a closed-loop circulation device for pumps, mechanical seals, and water supply. Background Technology

[0002] Chemical plant refers to a complete set of equipment systems designed and built in the chemical industry to achieve process objectives such as physical changes of materials, chemical reactions, and product separation and purification. It is usually composed of multiple units, which are connected by pipelines, valves, instruments, etc. to form a complete process flow. Chemical plant is an indispensable infrastructure in the production of fertilizer materials such as urea.

[0003] In chemical production plants, the seals of pumps and motors are critical components. Leakage of mechanical seals not only increases the workload of maintenance personnel but also threatens the stable operation of the entire chemical plant. Many media in chemical pumps are high-temperature and high-pressure, such as ammonium nitrate solution in ammonium nitrate plants, methyl ammonium solution in urea plants, and urea solution in melamine plants. The temperature of these media can reach 140°-180°. Mechanical seals need to be cooled to ensure their service life.

[0004] The existing method involves directly cooling the mechanical seal with demineralized water and then discharging it into the condensate tank. This process consumes a large amount of demineralized water. Furthermore, since the demineralized water carries the pump's internal medium after cooling, it needs to be recycled before reuse, resulting in a large consumption of demineralized water. Therefore, companies not only have to pay for the cost of the demineralized water used for cooling, but also for the cost of purifying the related cooling discharge liquid. To address these issues, a closed-loop circulation device for the sealing water of the pump and mechanical seal is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a closed-loop water circulation device for pumps and mechanical seals to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A closed-loop circulation device for pump and mechanical seal water supply includes a demineralized water tank. A water inlet pipe is connected to one rear end of the demineralized water tank. A remote level gauge is connected to one side of the demineralized water tank. A first circulation pump and a second circulation pump are located on the side of the demineralized water tank furthest from the remote level gauge. A heat exchanger is located behind the first and second circulation pumps. Each pump and mechanical seal box is located behind the demineralized water tank. A return pipe is located on one side of each pump and mechanical seal box. The first circulation pump is connected to the demineralized water tank and the heat exchanger via a connecting pipe. The second circulation pump is connected to the first circulation pump and the heat exchanger via a connecting pipe. The heat exchanger is connected to each pump and mechanical seal box via a connecting pipe.

[0008] As a further optimization of this utility model, one end of the return pipe is connected to the sealing box of each pump, the other end of the return pipe is provided with a filter assembly, and the return pipe is connected to the demineralized water tank through the filter assembly.

[0009] As a further optimization of this utility model, the filter assembly includes a filter box, and a door is hinged to the side of the filter box near the water inlet pipe via a hinge shaft. A sealing strip is fixedly connected to the inner edge of the door, and a sealing groove adapted to the sealing strip is provided on the side wall edge of the filter box near the door.

[0010] As a further optimization of this utility model, the inner cavity of the filter box is fixedly connected with a first filter plate and a second filter plate, the first filter plate being close to the return pipe and the second filter plate being close to the desalination tank.

[0011] As a further optimization of this utility model, a vibration motor is fixedly installed at the center of the side wall of the first filter plate and the second filter plate on the side away from the return pipe. A protective cover is fitted on the outside of the vibration motor, and the protective cover is fixedly connected to the side wall of the first filter plate and the second filter plate on the side away from the return pipe.

[0012] As a further optimization of this utility model, the bottom of the filter box is provided with two sunken triangular settling troughs, which are located on the side of the first filter plate and the second filter plate near the return pipe, respectively. The settling troughs are provided with matching triangular cleaning blocks.

[0013] As a further optimization of this utility model, a first magnetic block is embedded on the side of the cleaning block away from the door, and a second magnetic block is embedded at the bottom of the inner wall of the filter box away from the door. The first magnetic block and the second magnetic block are opposite magnetic poles with corresponding positions and matching specifications.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, the demineralized water tank, water supply pipe, first circulation pump, second circulation pump, heat exchanger, mechanical seal boxes of each pump, and return pipe allow for direct closed-loop circulation of demineralized water without external discharge. This removes heat from the mechanical seals, enabling cooling of the mechanical seals with a smaller amount of demineralized water used for circulation. Consequently, the stable operating time of the pumps is increased, ensuring long-term, full-capacity, and stable operation of the chemical plant. The filter components filter the demineralized water during the reflux process, preventing impurities from clogging the pipes or accelerating wear and corrosion of the first circulation pump, second circulation pump, heat exchanger, and other equipment, thus avoiding a reduction in equipment lifespan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the filter assembly of this utility model. Figure 1 ;

[0019] Figure 4 This is a schematic diagram of the structure of the filter assembly of this utility model. Figure 2 ;

[0020] Figure 5 This is a cross-sectional view of the filter assembly of this utility model;

[0021] Figure 6 This is a cross-sectional view of the bottom of the filter box of this utility model. Figure 1 ;

[0022] Figure 7 This is a cross-sectional view of the bottom of the filter box of this utility model. Figure 2 ;

[0023] Figure 8 This utility model Figure 7 Enlarged view of point A.

[0024] In the diagram: 1. Demineralized water tank; 2. Water supply pipe; 3. Remote level gauge; 4. First circulation pump; 5. Second circulation pump; 6. Heat exchanger; 7. Pump casings; 8. Return pipe; 9. Filter assembly; 901. Filter box; 902. Box door; 903. Sealing strip; 904. Sealing groove; 905. First filter plate; 906. Second filter plate; 907. Vibration motor; 908. Protective cover; 909. Settling tank; 910. Cleaning block; 911. First magnetic block; 912. Second magnetic block. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Please see Figures 1-8 This utility model provides a technical solution:

[0028] A closed-loop circulation device for pump and mechanical seal water supply includes a demineralized water tank 1. A water inlet pipe 2 is connected to one end of the rear side of the demineralized water tank 1. A remote level gauge 3 is connected to one side of the demineralized water tank 1. A first circulation pump 4 and a second circulation pump 5 are provided on the side of the demineralized water tank 1 away from the remote level gauge 3. A heat exchanger 6 is provided on the rear side of the first circulation pump 4 and the second circulation pump 5. Each pump and mechanical seal box 7 is provided on the rear side of the demineralized water tank 1. A return pipe 8 is provided on one side of each pump and mechanical seal box 7. The first circulation pump 4 is connected to the demineralized water tank 1 and the heat exchanger 6 through a connecting pipe. The second circulation pump 5 is connected to the first circulation pump 4 and the heat exchanger 6 through a connecting pipe. The heat exchanger 6 is connected to each pump and mechanical seal box 7 through a connecting pipe.

[0029] As a further implementation of this scheme, one end of the return pipe 8 is connected to each pump seal box 7, and the other end of the return pipe 8 is equipped with a filter assembly 9. The return pipe 8 is connected to the demineralized water tank 1 through the filter assembly 9. The above arrangement allows the demineralized water discharged from the demineralized water tank 1 to be circulated back to the demineralized water tank 1 after cooling, so that the cooling of the mechanical seal can be guaranteed by using less demineralized water for circulation.

[0030] As a further implementation of this solution, the filter assembly 9 includes a filter box 901. A door 902 is hinged to the side of the filter box 901 near the water inlet pipe 2 via a hinge shaft. A sealing strip 903 is fixedly connected to the inner edge of the door 902. A sealing groove 904, matching the sealing strip 903, is formed on the side wall edge of the filter box 901 near the door 902. A first filter plate 905 and a second filter plate 906 are fixedly connected to the inner cavity of the filter box 901. The first filter plate 905 is near the return pipe 8, and the second filter plate 906 is near the desalination tank 1. A vibration motor 907 is fixedly installed at the center of the side wall of both the first filter plate 905 and the second filter plate 906 away from the return pipe 8. A protective cover 908 is fitted around the vibrating motor 907, and the protective cover 908 is positioned away from the first filter plate 905 and the second filter plate 906 away from the return pipe. The side wall of the filter box 901 is fixedly connected to the filter box 901. The bottom of the filter box 901 is provided with two sunken triangular settling tanks 909. The two settling tanks 909 are located on the side of the first filter plate 905 and the second filter plate 906 near the return pipe 8, respectively. The settling tank 909 is provided with a matching triangular cleaning block 910. The cleaning block 910 is embedded with a first magnetic block 911 on the side away from the box door 902. The bottom of the inner wall of the filter box 901 on the side away from the box door 902 is embedded with a second magnetic block 912. The first magnetic block 911 and the second magnetic block 912 are set with opposite magnetic poles that are corresponding in position and matching in specification. The above arrangement can filter the demineralized water when it is circulated back, so as to prevent the demineralized water from being entrained with impurities after circulation back and clogging the pipes or accelerating the wear and corrosion of the first circulation pump 4, the second circulation pump 5, the heat exchanger 6, the pipes and other equipment, and avoid reducing the service life of the equipment.

[0031] Workflow: Demineralized water from the water inlet pipe 2 enters the demineralized water tank 1. After being pressurized to 0.4~0.5MPa by the first circulation pump 4, it enters the heat exchanger 6. The heat in the heat exchanger 6 is carried away by the circulating cooling water, which then branches to each pump's mechanical seal box 7 for cooling after passing through the connecting pipe. It then returns to the demineralized water tank 1 through the return pipe 8, and is then drawn in again by the first circulation pump 4 and pressurized before being transported to the heat exchanger 6 to continue the circulating cooling of the mechanical seal. The liquid level in the demineralized water tank 1 is partially lost due to the loss of some mechanical seals. The liquid level can be replenished in time by controlling the valve of the water inlet pipe 2 according to the remote level gauge 3. The first circulation pump 4 and the second circulation pump 5 serve as backup pumps for each other. When the first circulation pump 4 fails and needs maintenance, it is manually switched to the second circulation pump 5. Through the above method, the demineralized water entering the mechanical seal is guaranteed to be normal in real time, thereby ensuring the normal cooling of the mechanical seal, ensuring the normal use of the mechanical seal, and finally ensuring the normal operation of the pumps and the service life of the mechanical seal.

[0032] The filter assembly 9 filters the demineralized water before it circulates back to the demineralized water tank 1 through the return pipe 8. This prevents impurities from clogging the pipes or accelerating the wear and corrosion of equipment such as the first circulation pump 4, the second circulation pump 5, the heat exchanger 6, and other pipelines after the demineralized water circulates back, thus avoiding a reduction in equipment lifespan. After circulation, the demineralized water is introduced into the filter box 901 through the return pipe 8 and undergoes double filtration through the first filter plate 905 and the second filter plate 906. Impurities are blocked by the first filter plate 905 and the second filter plate 906, preventing them from flowing back into the demineralized water tank 1. The sinking settling tank 909 collects the blocked impurities. Inevitably, some impurities will adhere to the first filter plate 905 and the second filter plate 906 during filtration. The vibration motor 907 can vibrate the first filter plate 905 and the second filter plate 906 at high frequency to remove the adhering impurities. Impurities on the first filter plate 905 and the second filter plate 906 are shaken off into the settling tank 909. The protective cover 908 provides good sealing protection for the vibration motor 907. When it is necessary to clean the impurities, the box door 902 is opened, and then the magnetic attraction between the first magnetic block 911 and the second magnetic block 912 is overcome, and the cleaning block 910 is slid along the settling tank 909 toward the box door 902. The cleaning block 910 can push out the impurities collected in the settling tank 909. After cleaning, the cleaning block 910 is pushed inward along the settling tank 909 until the cleaning block 910 is magnetically fixed by the first magnetic block 911 and the second magnetic block 912. Then the box door 902 is closed. When the box door 902 is closed, the sealing strip 903 will be tightly inserted into the sealing groove 904 and fill the gap of the sealing groove 904 to ensure the sealing between the box door 902 and the filter box 901.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A closed-loop circulation device for sealing water in a pump and motor seal, comprising a demineralized water tank (1), characterized in that: The demineralized water tank (1) is connected to a water supply pipe (2) at one end of its rear side, and a remote level gauge (3) is connected to one side of the demineralized water tank (1). A first circulation pump (4) and a second circulation pump (5) are provided on the side of the demineralized water tank (1) away from the remote level gauge (3). A heat exchanger (6) is provided on the rear side of the first circulation pump (4) and the second circulation pump (5). Each pump sealing box (7) is provided on the rear side of the demineralized water tank (1), and a return pipe (8) is provided on one side of each pump sealing box (7). The first circulating pump (4) is connected to the demineralized water tank (1) and the heat exchanger (6) through a connecting pipe. The second circulating pump (5) is connected to the first circulating pump (4) and the heat exchanger (6) through a connecting pipe. The heat exchanger (6) is connected to each pump casing (7) through a connecting pipe.

2. A pump seal sealing water closed circuit circulating device according to claim 1, characterized in that: One end of the return pipe (8) is connected to each pump sealing box (7), and the other end of the return pipe (8) is provided with a filter assembly (9), and the return pipe (8) is connected to the demineralized water tank (1) through the filter assembly (9).

3. A pump seal sealing water closed circuit circulating device according to claim 2, characterized in that: The filter assembly (9) includes a filter box (901). A door (902) is hinged to the side of the filter box (901) near the water pipe (2) via a hinge shaft. A sealing strip (903) is fixedly connected to the inner edge of the door (902). A sealing groove (904) adapted to the sealing strip (903) is provided on the side wall edge of the filter box (901) near the door (902).

4. A pump seal sealing water closed circuit circulating device according to claim 3, characterized in that: The inner cavity of the filter box (901) is fixedly connected with a first filter plate (905) and a second filter plate (906). The first filter plate (905) is close to the return pipe (8), and the second filter plate (906) is close to the desalination tank (1).

5. A pump seal sealing water closed circuit circulating device according to claim 4, characterized in that: Vibration motors (907) are fixedly installed at the center of the sidewalls of the first filter plate (905) and the second filter plate (906) away from the return pipe (8). A protective cover (908) is fitted on the outside of the vibration motor (907), and the protective cover (908) is fixedly connected to the sidewalls of the first filter plate (905) and the second filter plate (906) away from the return pipe (8).

6. A pump seal sealing water closed circuit circulating device according to claim 4, characterized in that: The bottom of the filter box (901) is provided with two sunken triangular settling troughs (909). The two settling troughs (909) are located on the side of the first filter plate (905) and the second filter plate (906) near the return pipe (8), respectively. The settling troughs (909) are provided with matching triangular cleaning blocks (910).

7. A pump seal sealing water closed circuit circulating device according to claim 6, characterized in that: The cleaning block (910) has a first magnetic block (911) embedded on the side away from the door (902), and the filter box (901) has a second magnetic block (912) embedded at the bottom of the inner wall on the side away from the door (902). The first magnetic block (911) and the second magnetic block (912) are opposite magnetic poles with corresponding positions and matching specifications.

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