Multi-stage sectional type high-pressure water feeding pump capable of monitoring condition of balancing device

Abstract

The utility model relates to the technical field of multi-stage sectional type high-pressure feed pumps, in particular to a multi-stage sectional type high-pressure feed pump capable of monitoring the condition of a balancing device, which comprises a shell, a suction inlet is arranged at one end of the shell, and a discharge port and an axial thrust balancing device are arranged at the other end of the shell; the axial thrust balancing device comprises a balancing sleeve, a balancing drum and a balancing pipe, one end of the balancing sleeve is communicated with the interior of the shell, and the other end is closed; the balance drum is slidably connected in the balance sleeve, two ends of the balance pipe are respectively communicated with the balance sleeve and the suction inlet, and a pressure measuring device is mounted on the balance pipe; the pressure measuring device is a pressure transmitter which is electrically connected with a DCS (Distributed Control System); by arranging the pressure measuring device, whether the balancing device is abraded or not can be judged by detecting the pressure of the balancing pipe, so that the condition of the balancing device can be monitored in time, and the expansion of accidents is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage segmented high-pressure water supply pumps, in particular to a multi-stage segmented high-pressure water supply pump capable of monitoring the status of a balancing device. Background Art

[0002] Thermal power generating units above 135MW are all equipped with multi-stage segmented core-pack integrally extractable high-pressure feed water pumps. The high-pressure feed water pump has a high head, low pressure at the suction end, and high pressure at the discharge end, which causes axial thrust from the high-pressure side to the low-pressure side. The water pump is equipped with an axial thrust balancing device to balance the axial thrust. Currently, there is no effective monitoring method for the axial thrust balancing device of the high-pressure feed water pump. Once the balancing device has abnormal conditions such as wear, it is easy to cause the accident to expand and even affect the safe operation of the generator set. Utility Model Content

[0003] The main purpose of the utility model is to provide a multi-stage segmented high-pressure water supply pump that can monitor the status of the balancing device, so as to solve the problem in the above-mentioned prior art that the axial thrust balancing device has no effective monitoring means and abnormal conditions can easily cause accidents to escalate.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a multi-stage segmented high-pressure water supply pump capable of monitoring the status of a balancing device, comprising a shell, one end of which is provided with a suction port, and the other end of which is provided with a discharge port and an axial thrust balancing device; the axial thrust balancing device comprises a balancing sleeve, a balancing drum and a balancing pipe, one end of the balancing sleeve is connected to the interior of the shell, and the other end is closed; the balancing drum is slidably connected in the balancing sleeve, and both ends of the balancing pipe are respectively connected to the balancing sleeve and the suction port, and a pressure measuring device is installed on the balancing pipe.

[0005] Furthermore, the pressure measuring device is a pressure transmitter, and the pressure transmitter is electrically connected to a DCS system.

[0006] Furthermore, a central shaft is installed inside the shell, and an impeller is installed on the central shaft; the central shaft extends into the interior of the balancing sleeve, and the balancing drum is installed on the central shaft.

[0007] The utility model is provided with a pressure measuring device, which can determine whether the balancing device is worn by detecting the pressure of the balancing pipe, thereby being able to monitor the condition of the balancing device in time and avoid the expansion of accidents.

[0008] The utility model can transmit the value measured by the pressure measuring device to the DCS system, so that the control room personnel can obtain the status of the balancing device in time and take measures in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0010] Figure 1 It is a structural schematic diagram of an embodiment;

[0011] In the figure: 1. Shell; 101. Suction port; 102. Discharge port; 2. Axial thrust balancing device; 201. Balancing sleeve; 202. Balancing drum; 203. Balancing pipe; 3. Pressure transmitter; 4. Center shaft; 5. Impeller; 6. Mechanical seal. DETAILED DESCRIPTION

[0012] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0013] like Figure 1 As shown, according to an embodiment of the present invention, a multi-stage segmented high-pressure water supply pump capable of monitoring the status of a balancing device is provided, comprising a shell 1, one end of the shell 1 being provided with a suction port 101, and the other end being provided with a discharge port 102 and an axial thrust balancing device 2; the axial thrust balancing device 2 comprising a balancing sleeve 201, a balancing drum 202 and a balancing pipe 203, one end of the balancing sleeve 201 being connected to the interior of the shell 1, and the other end being closed; the balancing drum 202 is slidably connected in the balancing sleeve 201, and both ends of the balancing pipe 203 are respectively connected to the balancing sleeve 201 and the suction port 101, and a pressure measuring device is installed on the balancing pipe 203.

[0014] The pressure measuring device is a pressure transmitter 3 , which is electrically connected to a DCS system.

[0015] A central shaft 4 is installed inside the housing 1 , and an impeller 5 is installed on the central shaft 4 ; the central shaft 4 extends into the interior of the balancing sleeve 201 , and the balancing drum 202 is installed on the central shaft 4 ; the central shaft 4 is connected to the housing 1 and the balancing sleeve 201 through a mechanical seal 6 .

[0016] The working principle of this embodiment is: under normal working conditions, the pressure measured by the pressure transmitter 3 is basically stable and is within the range of 1.5MPa-2.2MPa; when the pressure of the pressure transmitter 3 increases and exceeds the range of 1.5MPa-2.2MPa, it indicates that the balance drum 202 in the axial thrust balancing device 2 is worn, causing the water on the high-pressure side in the shell 1 to flow into the balance pipe 203; after the worker reads that the value of the pressure transmitter 3 is out of range, the high-pressure water pump is shut down and the axial thrust balancing device 2 is repaired.

[0017] This embodiment provides a pressure measuring device to detect the pressure of the balancing pipe 203 to determine whether the axial thrust balancing device 2 is worn, thereby timely monitoring the condition of the axial thrust balancing device 2 and preventing the escalation of accidents. This embodiment can transmit the value measured by the pressure measuring device to the DCS system, so that control room personnel can obtain the condition of the axial thrust balancing device 2 in a timely manner and take timely measures.

[0018] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multi-stage segmented high-pressure water supply pump capable of monitoring the status of a balancing device, comprising a housing (1), one end of the housing (1) being provided with a suction port (101), the other end being provided with a discharge port (102) and an axial thrust balancing device (2); the axial thrust balancing device (2) comprising a balancing sleeve (201), a balancing drum (202) and a balancing pipe (203); one end of the balancing sleeve (201) being in communication with the interior of the housing (1) and the other end being closed; the balancing drum (202) being slidably connected in the balancing sleeve (201), and both ends of the balancing pipe (203) being in communication with the balancing sleeve (201) and the suction port (101), respectively, characterized in that: A pressure measuring device is installed on the balance pipe (203).

2. The multi-stage segmented high-pressure water supply pump capable of monitoring the status of the balancing device according to claim 1, characterized in that: The pressure measuring device is a pressure transmitter (3), and the pressure transmitter (3) is electrically connected to a DCS system.

3. The multi-stage segmented high-pressure water supply pump capable of monitoring the status of the balancing device according to claim 1, characterized in that: A central shaft (4) is installed inside the housing (1), and an impeller (5) is installed on the central shaft (4); the central shaft (4) extends into the interior of the balancing sleeve (201), and the balancing drum (202) is installed on the central shaft (4).

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