Electric feed pump capable of automatically adjusting rotating speed according to load change of thermal power plant

Abstract

The utility model discloses an electric feed pump capable of automatically adjusting rotating speed according to load change of a thermal power plant, and particularly relates to the technical field of thermal power plants, which comprises a first support base, a main feed pump and an auxiliary feed pump, and the main water feeding pump is arranged above the first supporting base through bolts, and an auxiliary water feeding pump is installed above the second supporting base through bolts. When a water source is conveyed, the main water feeding pump and the auxiliary water feeding pump regulate and control the rotating speed of turbine blades through a frequency conversion module in a control box at the moment, the flow conveyed by the water source is adjusted, and the water source can be shunted through a double-position inserting pipe at the moment; and therefore, the double-position inserting pipe conveys a water source into the main water feeding pump and the auxiliary water feeding pump correspondingly, the conveying flow of the water source can be adjusted and controlled according to the temperature of the thermal power plant boiler, and adjustment of the water source is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power plants, and more specifically, to an electric water supply pump capable of automatically adjusting its rotation speed according to load changes in the thermal power plant. Background Art

[0002] The feedwater pump in a thermal power plant is a key auxiliary equipment. Its main function is to increase the pressure of the feedwater in the deaerator tank and deliver it to the boiler to meet the boiler's water demand. The feedwater pump ensures sufficient and continuous water supply to the boiler, which is crucial to maintaining the normal operation of the thermal power plant and improving power generation efficiency.

[0003] After searching, the existing application number is: CN200910050488.8, which relates to a boiler feed water pump, specifically a high-pressure boiler feed water pump matched with a thermal power generating set, characterized in that: an inducer is provided on the pump shaft in front of the first-stage impeller of the multi-stage impeller, and the inducer and the first-stage impeller form an inducer mechanism; the beneficial effects of the present invention: due to the use of an inducer mechanism to solve the cavitation problem, combined with the double-shell structure technology, the designed high-speed and large-flow new high-pressure boiler feed water pump does not have a pre-pump, and is easy to maintain. By not having a pre-pump, the area occupied by the pump group is reduced, the system is simplified, the reliability and safety of the system are improved, and the project cost is reduced; by using a double-shell structure, there is no need to disconnect the inlet and outlet pipes, the pump seat and the pump casing components during maintenance, making installation, debugging, maintenance, and overhaul convenient and quick, reducing overhaul time, improving the utilization rate of the boiler, and increasing the economic benefits of the power plant. In the process of realizing the present utility model, the inventor found that the existing technology has the following problems:

[0004] In existing thermal power plants, when water is delivered to the boiler, if the temperature inside the boiler changes, the water source is only delivered to the boiler through a single feed water pump. This often results in the water source being unable to deliver a large amount of liquid to the boiler in a short period of time, thus affecting the use of the boiler in the thermal power plant.

[0005] Therefore, in order to solve the above problems, an electric feed water pump which automatically adjusts the speed according to the load change of the thermal power plant is proposed. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the utility model provides an electric water supply pump which automatically adjusts the rotation speed according to the load change of the thermal power plant, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an electric water feed pump that automatically adjusts the speed according to the load changes of a thermal power plant, comprising a first support base 1, a main water feed pump 2 and an auxiliary water feed pump 11, a second support base 12 is provided on the side of the first support base 1, and the main water feed pump 2 is provided on the top of the first support base 1 by bolts, and the auxiliary water feed pump 11 is installed on the top of the second support base 12 by bolts, and a control box 17 is provided on the side of the main water feed pump 2 away from the auxiliary water feed pump, and a frequency conversion module 22 is placed above the inner wall of the control box 17.

[0008] Preferably, a second water outlet 20 is provided above the main water supply pump 2, and a second water supply pipe 2001 is installed above the second water outlet 20, and a second water inlet 21 is provided at the water inlet end of the main water supply pump 2, and a first connecting pipe 3 is installed on the side of the second water inlet 21 away from the main water supply pump 2 through bolts.

[0009] Preferably, a first water outlet 18 is provided above the auxiliary water pump 11, and a first water supply pipe 1901 is installed above the first water outlet 18, and a first water inlet 19 is provided at the water inlet end of the auxiliary water pump 11, and a second connecting pipe 10 is provided on the side of the first water inlet 19 away from the auxiliary water pump 11.

[0010] Preferably, a liquid observation box 4 is provided on the side of the first connecting pipe 3 away from the main water pump 2, and two groups of docking pipes 501 are provided on the side of the liquid observation box 4 away from the first connecting pipe 3, and a first electric valve 5 is installed at the center of the two groups of docking pipes 501.

[0011] Preferably, a second electric valve 9 is provided on the side of the second connecting pipe 10 away from the auxiliary water supply pump 11, and a double-position plug-in pipe 6 is installed on the side of the first connecting pipe 3 and the second connecting pipe 10 away from the main water supply pump 2, and a mounting ring 7 is provided on the side of the double-position plug-in pipe 6 away from the first connecting pipe 3, and a water supply pipe 8 is provided on the side of the mounting ring 7 away from the double-position plug-in pipe 6.

[0012] Preferably, a delivery pipe 13 is provided at the center of the first water delivery pipe 1901 and the second water delivery pipe 2001, and a docking joint 14 is provided on the side of the delivery pipe 13 away from the double-position plug-in pipe 6, and a liquid delivery pipe 15 is provided on the side of the docking joint 14 away from the delivery pipe 13, and an inspection ring 16 is provided on the side of the liquid delivery pipe 15 away from the docking joint 14.

[0013] Preferably, the inspection ring 16 includes a connecting groove 23 , a temperature detection probe 24 and a limit block 25 , and the temperature detection probe 24 is provided below the connecting groove 23 , and the limit block 25 is provided above the connecting groove 23 .

[0014] Technical effects and advantages of this utility model:

[0015] 1. Compared with the existing technology, when the electric feed water pump that automatically adjusts the speed according to the load change of the thermal power plant is inspected on the boiler through the inspection ring, the temperature of the boiler can be monitored in real time through the temperature detection probe in the inspection ring, so that the temperature change in the boiler can be obtained in real time, which makes it convenient to regulate the flow rate of the feed water pump according to the temperature in the boiler.

[0016] 2. Compared with the existing technology, this electric feed water pump that automatically adjusts the speed according to the load changes of the thermal power plant regulates the water source during the transportation process through the main feed water pump and the auxiliary feed water pump. When transporting the water source, the main feed water pump and the auxiliary feed water pump regulate the speed of rotation of their turbine blades through the frequency conversion module in the control box, and the flow rate of the water source can be diverted through the double-position plug-in pipe, so that the double-position plug-in pipe can transport the water source into the main feed water pump and the auxiliary feed water pump respectively, so that the water source transportation flow rate can be regulated according to the temperature of the thermal power plant boiler, thereby completing the regulation of the water source. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a structural diagram of the double-position plug-in of the present utility model.

[0019] Figure 3 This is a structural diagram of the auxiliary water supply pump of the utility model.

[0020] Figure 4 This is a structural diagram of the main water supply pump of the present utility model.

[0021] Figure 5 This is a schematic structural diagram of the inspection ring of the present utility model.

[0022] The accompanying drawings are marked as follows: 1. first supporting base; 2. main water supply pump; 3. first connecting pipe; 4. liquid observation box; 5. first electric valve; 501. docking pipe; 6. double-position plug-in pipe; 7. mounting ring; 8. water supply pipe; 9. second electric valve; 10. second connecting pipe; 11. auxiliary water supply pump; 12. second supporting base; 13. delivery pipe; 14. docking joint; 15. liquid delivery pipe; 16. inspection ring; 17. control box; 18. first water outlet; 19. first water inlet; 1901, first water supply pipe; 20. second water outlet; 2001, second water supply pipe; 21. second water inlet; 22. frequency conversion module; 23. connecting groove; 24. temperature detection probe; 25. limit block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] As attached Figures 1 to 5 The electric feed water pump shown here automatically adjusts the speed according to the load changes of the thermal power plant, includes a first support base 1, a main feed water pump 2 and an auxiliary feed water pump 11. A second support base 12 is provided on the side of the first support base 1, and the main feed water pump 2 is provided on the top of the first support base 1 by bolts, and the auxiliary feed water pump 11 is installed on the top of the second support base 12 by bolts, and a control box 17 is provided on the side of the main feed water pump 2 away from the auxiliary feed water pump, and a frequency conversion module 22 is placed on the inner wall of the control box 17.

[0026] Among them: when it is used again in the thermal power plant, the water supply pipe 8 transports the water source into the two-position plug-in pipe 6, and the second electric valve 9 is closed at this time, and then the first electric valve 5 is opened, so that the water source is transported to the first connecting pipe 3 through the two-position plug-in pipe 6, so that the water source enters the interior of the liquid observation box 4 through the first connecting pipe 3, and enters the interior of the main water supply pump 2 through the liquid observation box 4, and then the water source is transported into the interior of the second water supply pipe 2001 through the main water supply pump 2, and then the water source is transported into the interior of the delivery pipe 13 through the second water supply pipe 2001, so that the delivery pipe 13 transports the water source into the interior of the liquid delivery pipe 15, Thereby, the water source is delivered to the boiler. At this time, when the detection ring 16 detects the temperature change of the boiler, the second electric valve 9 is opened, so that the water source flows to the inside of the first connecting pipe 3 and the second connecting pipe 10 respectively through the double-position plug-in pipe 6, thereby completing the diversion of the water source, and the second electric valve 9 is opened, so that the water source is delivered to the inside of the auxiliary water supply pump 11 through the second connecting pipe 10, and then the frequency conversion module 22 inside the control box 17 regulates the frequency of the main water supply pump 2 and the auxiliary water supply pump 11, so that the water source enters the inside of the delivery pipe 13 through the main water supply pump 2 and the auxiliary water supply pump 11 at the same time, thereby completing the regulation of the water supply flow rate.

[0027] Example 2

[0028] Based on Example 1, the solution in Example 1 is further detailed in combination with the following specific working methods. Figures 1 to 5 As shown, see the following description for details:

[0029] As a preferred embodiment, a second water outlet 20 is provided above the main water pump 2, and a second water supply pipe 2001 is installed above the second water outlet 20, and a second water inlet 21 is provided at the water inlet end of the main water pump 2, and a first connecting pipe 3 is installed on the side of the second water inlet 21 away from the main water pump 2 through bolts, wherein the second water supply pipe 2001 above the main water pump 2 is installed with the second water outlet 20 of the main water pump 2, so when the water source enters the interior of the main water pump 2 through the second water inlet 21, the turbine blades inside the main water pump 2 drive the water source to spray toward the second water outlet 20, thereby completing the transportation of the water source.

[0030] As a preferred embodiment, a first water outlet 18 is provided above the auxiliary water pump 11, and a first water supply pipe 1901 is installed above the first water outlet 18, and a first water inlet 19 is provided at the water inlet end of the auxiliary water pump 11, and a second connecting pipe 10 is provided on the side of the first water inlet 19 away from the auxiliary water pump 11. Then, when the first water supply pipe 1901 above the auxiliary water pump 11 is installed with the first water outlet 18 of the auxiliary water pump 11, when the water source enters the interior of the auxiliary water pump 11 through the first water inlet 19, the turbine blades inside the auxiliary water pump 11 drive the water source to spray toward the first water outlet 18, thereby completing the transportation of the water source.

[0031] As a preferred embodiment, a liquid observation box 4 is provided on the side of the first connecting pipe 3 away from the main water supply pump 2, and two groups of docking pipes 501 are provided on the side of the liquid observation box 4 away from the first connecting pipe 3, and a first electric valve 5 is installed at the center of the two groups of docking pipes 501. Then, when the flow rate of water source delivered to the main water supply pump 2 is regulated by the first electric valve 5, it is convenient to adjust the delivery volume of the delivered liquid. Then, when the water source flows through the first connecting pipe 3, the water source will enter the interior of the liquid observation box 4 before entering the interior of the main water supply pump 2, so that the water source will first enter the interior of the liquid observation box 4, so that the structure of the liquid inside the liquid observation box 4 can be used to conveniently confirm the appearance of the water source during the delivery process.

[0032] As a preferred embodiment, a second electric valve 9 is provided on the side of the second connecting pipe 10 away from the auxiliary water supply pump 11, and a double-position plug-in pipe 6 is installed on the side of the first connecting pipe 3 and the second connecting pipe 10 away from the main water supply pump 2, and a mounting ring 7 is provided on the side of the double-position plug-in pipe 6 away from the first connecting pipe 3, and a water supply pipe 8 is provided on the side of the mounting ring 7 away from the double-position plug-in pipe 6, and then the water source flows through the water supply pipe 8, and the water source enters the interior of the double-position plug-in pipe 6 through the water supply pipe 8, thereby completing the diversion of the water source, and then the mounting ring 7 is used to install the water supply pipe 8 and the double-position plug-in pipe 6.

[0033] As a preferred embodiment, a delivery pipe 13 is provided at the center of the first water delivery pipe 1901 and the second water delivery pipe 2001, and a docking joint 14 is provided on the side of the delivery pipe 13 away from the double-position plug-in pipe 6, and a liquid delivery pipe 15 is provided on the side of the docking joint 14 away from the delivery pipe 13, and an inspection ring 16 is provided on the side of the liquid delivery pipe 15 away from the docking joint 14, and the first water delivery pipe 1901 and the second water delivery pipe 2001 connected on both sides of the delivery pipe 13 are staggered with each other, so that when the first water delivery pipe 1901 and the second water delivery pipe 2001 supply water at the same time, the two will not impact each other's water supply end through the water source, and when the liquid delivery pipe 15 is installed inside the boiler, the inspection ring 16 is installed at the center of the liquid delivery pipe 15 and the boiler, so that while completing the fixation of the liquid delivery pipe 15, it is also used to connect the inspection ring 16 to the boiler.

[0034] As a preferred embodiment, the inspection ring 16 includes a connecting groove 23, a temperature detection probe 24 and a limit block 25, and the temperature detection probe 24 is arranged below the connecting groove 23, and the limit block 25 is arranged above the connecting groove 23, wherein the connecting groove 23 of the inspection ring 16 is used to connect with the liquid delivery pipe 15, and then the temperature detection probe 24 is inserted into the interior of the boiler, and then when the inspection ring 16 is connected to the boiler, the limit block 25 is squeezed at this time, so that the extrusion block 25 is tilted up, so that the inspection ring 16 is stuck on the outer surface of the boiler.

[0035] The working process of the utility model is as follows: when it is used again in the thermal power plant, the water supply pipe 8 transports the water source into the double-position plug-in pipe 6. At this time, the second electric valve 9 is closed, and then the first electric valve 5 is opened, so that the water source is transported to the first connecting pipe 3 through the double-position plug-in pipe 6, so that the water source enters the interior of the liquid observation box 4 through the first connecting pipe 3, and the water source enters the interior of the main water supply pump 2 through the liquid observation box 4, and then the water source is transported into the interior of the second water supply pipe 2001 through the main water supply pump 2, and then the water source is transported into the interior of the delivery pipe 13 through the second water supply pipe 2001, so that the delivery pipe 13 transports the water source into the interior of the liquid delivery pipe 15, thereby completing the delivery of the water source to the boiler. At this time, when the detection ring 16 detects the temperature change of its boiler, the second electric valve 9 is opened, so that the water source flows to the first connecting pipe 3 through the double-position plug-in pipe 6. The interior of a connecting pipe 3 and a second connecting pipe 10 completes the diversion of the water source, and opens the second electric valve 9, so that the water source is transported into the interior of the auxiliary water supply pump 11 through the second connecting pipe 10, and then the frequency conversion module 22 in the control box 17 regulates the frequency of the main water supply pump 2 and the auxiliary water supply pump 11, so that the water source enters the interior of the delivery pipe 13 through the main water supply pump 2 and the auxiliary water supply pump 11 at the same time, thereby completing the regulation of the water supply flow rate, wherein the connection groove 23 of the inspection ring 16 is used to connect with the liquid delivery pipe 15, and then the temperature detection probe 24 is inserted into the interior of the boiler, and then when the inspection ring 16 is connected to the boiler, the limit block 25 is squeezed at this time, so that the extrusion block 25 is tilted, so that the inspection ring 16 is stuck on the outer surface of the boiler. The above is the working principle of an electric water supply pump that automatically adjusts the speed according to the load changes of the thermal power plant.

Claims

1. An electric feedwater pump that automatically adjusts its speed according to load changes in a thermal power plant, comprising a first support base (1), a main feedwater pump (2) and an auxiliary feedwater pump (11), characterized in that: A second support base (12) is provided on the side of the first support base (1), and the main water supply pump (2) is provided on the top of the first support base (1) by means of bolts, and an auxiliary water supply pump (11) is installed on the top of the second support base (12) by means of bolts, and a control box (17) is provided on the side of the main water supply pump (2) away from the auxiliary water supply pump, and a frequency conversion module (22) is placed on the inner wall of the control box (17).

2. The electric water supply pump that automatically adjusts the speed according to the load change of the thermal power plant according to claim 1 is characterized in that: A second water outlet (20) is provided above the main water supply pump (2), and a second water supply pipe (2001) is installed above the second water outlet (20), and a second water inlet (21) is provided at the water inlet end of the main water supply pump (2), and a first connecting pipe (3) is installed on the side of the second water inlet (21) away from the main water supply pump (2) through bolts.

3. The electric water supply pump that automatically adjusts the speed according to the load change of the thermal power plant according to claim 2 is characterized in that: A first water outlet (18) is provided above the auxiliary water supply pump (11), and a first water supply pipe (1901) is installed above the first water outlet (18), and a first water inlet (19) is provided at the water inlet end of the auxiliary water supply pump (11), and a second connecting pipe (10) is provided on the side of the first water inlet (19) away from the auxiliary water supply pump (11).

4. The electric water supply pump that automatically adjusts the speed according to the load change of the thermal power plant according to claim 3 is characterized in that: A liquid observation box (4) is provided on the side of the first connecting pipe (3) away from the main water supply pump (2), and two groups of butt joints (501) are provided on the side of the liquid observation box (4) away from the first connecting pipe (3), and a first electric valve (5) is installed at the center of the two groups of butt joints (501).

5. The electric water supply pump that automatically adjusts the speed according to the load change of the thermal power plant according to claim 4 is characterized in that: A second electric valve (9) is provided on the side of the second connecting pipe (10) away from the auxiliary water supply pump (11), and a double-position plug-in pipe (6) is installed on the side of the first connecting pipe (3) and the second connecting pipe (10) away from the main water supply pump (2), and a mounting ring (7) is provided on the side of the double-position plug-in pipe (6) away from the first connecting pipe (3), and a water supply pipe (8) is provided on the side of the mounting ring (7) away from the double-position plug-in pipe (6).

6. The electric water supply pump capable of automatically adjusting the rotational speed according to the load change of the thermal power plant according to claim 5, characterized in that: A delivery pipe (13) is provided at the center of the first water delivery pipe (1901) and the second water delivery pipe (2001), and a docking joint (14) is provided on the side of the delivery pipe (13) away from the double-position plug-in pipe (6), and a liquid delivery pipe (15) is provided on the side of the docking joint (14) away from the delivery pipe (13), and an inspection ring (16) is provided on the side of the liquid delivery pipe (15) away from the docking joint (14).

7. The electric water supply pump capable of automatically adjusting the rotational speed according to the load change of the thermal power plant according to claim 6, characterized in that: The inspection ring (16) comprises a connecting groove (23), a temperature detection probe (24) and a limit block (25), wherein the temperature detection probe (24) is provided below the connecting groove (23), and the limit block (25) is provided above the connecting groove (23).

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