Circulating pump

Abstract

The utility model relates to a circulating pump. A pump shell (1) is fixedly connected with a flow guide pipe (2), a middle plate (7) is connected to a heat insulation screen (9) of a motor (12), the heat insulation screen (9) is sleeved on a motor shaft (11), an impeller (6) is fixed on the motor shaft (11) through a key (10) and an impeller nut (3), a guide vane (5) is fixed on the middle plate (7) outside the impeller (6), and a piston ring (4) is arranged between the guide vane (5) and the flow guide pipe (2). The high-temperature and high-pressure wet-type motor matching pump is an important component of a heat supply reactor pressure boundary, guarantees completeness of a heat supply reactor loop, and is simple and novel in structure and convenient to disassemble and assemble.

Description

[0001] Technical field: The utility model relates to a circulation pump.

[0002] Background: The "pool-type low-temperature heating reactor" (LCHR) is a mature and highly safe nuclear reactor type used abroad, boasting significant advantages such as zero meltdown, zero emissions, easy decommissioning, and low investment. In addition to the reactor's multiple safety barriers, a higher-pressure isolation circuit is added to ensure radioactivity is isolated from the heating network. LCHRs offer flexible site selection, suitable for both inland and coastal locations, making them ideal for inland areas of northern China. LCHRs have a service life of 60 years. Economically, their heat price is far superior to natural gas, making them economically comparable to coal-fired power and combined heat and power generation. Complete reactor decommissioning allows for green reuse of the site. Building on over 50 years of safe and stable operation of LCHR research reactors, this safe, economical, and environmentally friendly reactor type has been developed to meet the heating needs of northern cities. Its principle is to place the reactor core deep within a normal-pressure water pool, utilizing the hydrostatic pressure of the water layer to raise the water temperature at the core outlet to meet heating requirements. Heat is transferred to the heating circuit through a two-stage heat exchanger, which then distributes the heat to households through the heating network.

[0003] The circulating pump for a nuclear pool-type low-temperature heating reactor is a wet-wound pump. Currently, domestic wet-wound pump technology is limited to boiler water circulating pumps in thermal power plants. However, wet-wound pump technology for nuclear heating reactors is significantly more complex than that for boiler water circulating pumps. It surpasses boiler water circulating pumps in terms of pump performance, water quality requirements, material properties, and structural performance. It also offers high head and multi-mode operation. Currently, this technology is not available in China. Therefore, there is an urgent need to develop wet-wound pump technology for nuclear pool-type low-temperature heating reactors.

[0004] Summary of the invention: The purpose of the utility model is to provide a circulating pump for a pool-type low-temperature nuclear energy heating reactor with a simple structure, stable performance, reliability and safety. The technical solution of the present invention is as follows: a circulating pump, wherein a pump housing (1) is fixedly connected to a flow guide pipe (2), an intermediate plate (7) is connected to a heat shield (9) of a motor (12), the heat shield (9) is sleeved on a motor shaft (11), an impeller (6) is fixed to the motor shaft (11) by a key (10) and an impeller nut (3), a guide vane (5) is fixed to the intermediate plate (7) outside the impeller (6), and a piston ring (4) is installed between the guide vane (5) and the flow guide pipe (2).

[0005] The pump housing (1) is a hemispherical structure and is provided with an inlet (1-1) and an outlet (1-2).

[0006] The impeller (5) is a closed centrifugal impeller.

[0007] A winding gasket (8) is installed between the motor (12) and the pump housing (1).

[0008] The working process of this utility model is:

[0009] The shaft (11) rotates to drive the impeller (6) to rotate, sucking the medium from the inlet (1-1) of the pump housing (1) and then guiding it through the guide pipe (2) into the impeller (6). After the energy is increased, the medium enters the guide vane (5) for rectification and is then discharged from the pump through the outlet (1-2) of the pump body (1).

[0010] The technical advantages of this utility model are:

[0011] 1. The nuclear main pump of the utility model is characterized in that the guide vane (4) is mounted on the intermediate plate (7), the intermediate plate (7) is directly mounted on the heat shield (9) of the motor (12), the impeller (6) is directly mounted on the shaft (11) of the motor (12) through the key (10) and the impeller nut (3), and is inserted into the interior of the pump housing (1) together with the motor (12) as a whole, and is easy to assemble and disassemble.

[0012] 2. The nuclear main pump of the utility model is characterized in that the pump housing (1) and the motor (12) are sealed with a spiral wound gasket (8), the structure is simple, the safety is high, and the installation and disassembly are convenient.

[0013] 3. The nuclear main pump of the utility model is characterized in that a piston ring (4) is added between the guide pipe (2) and the guide vane (5), which plays the role of internal sealing and pressure bearing. Description of the drawings:

[0014] Figure 1 This is a schematic diagram of a circulation pump of the utility model Specific implementation method:

[0015] like Figure 1 As shown: A circulating pump, the pump casing 1 is fixedly connected to the guide tube 2, the intermediate plate 7 is connected to the heat insulation screen 9 of the motor 12, the heat insulation screen 9 is mounted on the motor shaft 11, the impeller 6 is fixed to the motor shaft 11 by the key 10 and the impeller nut 3, the guide vane 5 is fixed to the intermediate plate 7 outside the impeller 6, and the piston ring 4 is installed between the guide vane 5 and the guide tube 2.

[0016] The pump housing 1 is a hemispherical structure and is provided with an inlet 1-1 and an outlet 1-2.

[0017] The impeller 5 is a closed centrifugal impeller.

[0018] A spiral wound gasket 8 is installed between the motor 12 and the pump housing 1 .

[0019] First, install the guide tube 2 on the pump housing 1. Install the intermediate plate 7 on the heat shield 9 of the motor 12, install the impeller 6 on the motor shaft 11 of the motor 12 using the key 10 and the impeller nut 3, and then put the guide vane 5 on the outside of the impeller 6 and install it on the intermediate plate 7.

[0020] Put the spiral wound pad 8 into the sealing groove of the heat shield 9, and then put the piston ring 4 into the groove of the guide vane 5. Finally, install the entire assembly of the impeller 6 and the pump casing 1 together.

Claims

1. A circulating pump, characterized in that: The pump housing (1) is fixedly connected to the guide tube (2), the intermediate plate (7) is connected to the heat shield (9) of the motor (12), the heat shield (9) is mounted on the motor shaft (11), the impeller (6) is fixed to the motor shaft (11) through a key (10) and an impeller nut (3), the guide vane (5) is fixed to the intermediate plate (7) outside the impeller (6), and a piston ring (4) is installed between the guide vane (5) and the guide tube (2).

2. A circulating pump according to claim 1, characterized in that: The pump housing (1) is a hemispherical structure and is provided with an inlet (1-1) and an outlet (1-2).

3. A circulating pump according to claim 1, characterized in that: The impeller (6) is a closed centrifugal impeller.

4. A circulating pump according to claim 1, characterized in that: A winding gasket (8) is installed between the motor (12) and the pump housing (1).

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