Protection device for make-up pump

Abstract

The utility model discloses a make-up pump protection device, which belongs to the technical field of make-up pump protection and comprises a plate heat exchanger, one side of the plate heat exchanger is connected with a heat source through a primary water return pipeline, the other side of the plate heat exchanger is connected with a heat user through a secondary water supply pipeline, and a circulating pump is arranged on the secondary water supply pipeline. The secondary water supply pipeline is connected with a double-pump parallel configuration through a water replenishing pipeline, and the double-pump parallel configuration is connected with a water replenishing tank through a water outlet pipeline; a liquid level sensor is arranged in the water replenishing tank, and the liquid level sensor and the double pumps are arranged in parallel and are electrically connected with a controller; and filters are respectively arranged on the double-pump parallel configuration. The protection device for the make-up pump can prevent the make-up pump from dry rotation in a water-free state, so that the situation that the make-up pump is burnt down is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to water supplement pump protection technical field especially relates to a water supplement pump protection device. BACKGROUND

[0002] City central heating is the important infrastructure of city, is one of the important measures of energy saving, reducing environmental pollution. Heat station is one of three components in city central heating system, is the bridge connecting city heat pipe network and user heat network, and its main equipment heat exchanger unit is the complete set of regional heating equipment integrating heat exchanger, circulating water pump, water supplement pump, filter, instrument, various sensing components, pipeline, valve and industrial control instrument.

[0003] In central heating system, the pipeline system and use working condition of secondary side heat user circulating system are relatively complex, therefore, the phenomenon of water loss is more common, and too much water loss will lead to system pressure drop, and even will lead to the serious consequences of heat user water shortage and system shutdown. Therefore, generally, water supplement pump system is arranged on the secondary backwater pipeline of heat exchanger unit, that is, circulating water pump inlet, and water is supplemented to heat user circulating pump system. The normal operation of water supplement pump system can ensure the safe and stable operation of secondary side system.

[0004] However, in actual operation process, water supplement pump often encounters the situation that water tank is short of water due to large water supplement amount, water tank water is exhausted or water tank inlet pipeline fault, when water supplement pump cannot extract water tank water, water pump will be burnt due to idling, and then the serious consequences of heat user shortage and heat exchange system shutdown are caused, and there is the problem of serious water pump wear caused by poor water quality, and for some water pumps adopting filter device, the insufficient inlet flow of water supplement pump caused by blockage can lead to dry running problem. Based on this, the utility model provides a water supplement pump protection device. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a water supplement pump protection device, and solves the above-mentioned problems.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The utility model discloses a water supplement pump protection device, including plate heat exchanger, one side of plate heat exchanger is connected with heat source through primary backwater pipeline, and the other side is connected with heat user through secondary water supply pipeline, be provided with circulating pump on secondary water supply pipeline, secondary water supply pipeline is connected with double pump parallel configuration through water supplement pipeline, and double pump parallel configuration is connected with water supplement tank through outlet pipeline;Liquid level sensor is arranged in water supplement tank, and liquid level sensor and double pump parallel configuration are electrically connected with controller;Filter is arranged on double pump parallel configuration respectively.

[0008] Furthermore, the water supply tank is connected to a water network.

[0009] Furthermore, the dual-pump parallel configuration includes parallel distributed makeup water pumps.

[0010] Furthermore, the filter includes an integrally formed filter tube body, an inlet pipe body, and an outlet pipe body. A filter screen is installed inside the filter tube body, and both ends of the filter screen are sealed to the filter tube body and the inlet pipe body, respectively. A flange is connected to the port of the filter tube body by a clamp. A cleaning mechanism is provided on the inner wall of the filter screen, and a drive motor is connected to one end of the cleaning mechanism that protrudes from the flange.

[0011] Furthermore, the cleaning mechanism includes a rotating shaft connected to a brush roller. A rotating roller is provided at one end of the brush roller away from the rotating shaft. Several staggered scrapers are provided on the rotating roller. A claw-shaped scraper is provided at the end of the rotating roller away from the brush roller. The brush roller, the staggered scrapers, and the claw-shaped scrapers all abut against the inner wall of the filter screen.

[0012] Furthermore, several of the misaligned scrapers are spirally distributed on the rotating roller.

[0013] Furthermore, a central hole is provided at the center of the flange for the rotating shaft to pass through, and supports are symmetrically arranged on both sides of the central hole. A support sleeve is integrally formed between the supports, and the support sleeve is rotatably connected to the rotating shaft; the drive motor is disposed on the end face of the support sleeve.

[0014] Furthermore, the flange is provided with a drain port for connecting to a sewage pipe, and the sewage pipe is provided with a drain valve.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0016] This utility model provides a protection device for the water replenishment pump. When the water level in the tank falls below a set value, the water replenishment pump stops operating. Once the tank has been replenished and the water level rises above the set value, the pump resumes operation, thus protecting the pump. Furthermore, the parallel configuration of two pumps is a crucial solution for improving system reliability and ensuring continuous water replenishment. One pump is in operation while the other is on standby, or they operate alternately. Automatic switching occurs when a single pump fails, preventing system shutdowns and reducing wear on individual pumps through alternating operation. The filter design prevents severe pump wear caused by poor water quality, and the periodic cleaning mechanism prevents complete clogging after prolonged operation, effectively avoiding dry running due to insufficient inlet flow. In summary, this utility model's water replenishment pump protection device prevents the pump from burning out due to dry running in a waterless state. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a system diagram of the water supply pump protection device of this utility model;

[0019] Figure 2 This is a schematic diagram of the filter structure;

[0020] Figure 3 This is a cross-sectional view of the filter;

[0021] Figure 4 For cleaning the structural diagram of the mechanism;

[0022] Explanation of reference numerals in the attached diagram: 1. Plate heat exchanger; 2. Heat source; 3. Primary return water pipeline; 4. Heat user; 5. Secondary water supply pipeline; 6. Circulation pump; 7. Makeup water pipeline; 8. Makeup water tank; 9. Outlet water pipeline; 10. Makeup water pump; 11. Filter; 12. Liquid level sensor; 13. Controller; 14. Water network;

[0023] 1101. Filter pipe body; 1102. Inlet pipe body; 1103. Outlet pipe body; 1104. Flange; 1105. Clamp; 1106. Center hole; 1107. Bracket; 1108. Support sleeve; 1109. Drain outlet; 1110. Filter screen; 1111. Cleaning mechanism;

[0024] 1111-1, Rotating shaft; 1111-2, Brush roller; 1111-3, Rotating roller; 1111-4, Offset scraper; 1111-5, Claw scraper. Detailed Implementation

[0025] like Figures 1-4As shown, a water supply pump protection device includes a plate heat exchanger 1. One side of the plate heat exchanger 1 is connected to a heat source 2 via a primary return water pipeline 3, and the other side is connected to a heat user 4 via a secondary water supply pipeline 5. A circulating pump 6 is installed on the secondary water supply pipeline 5. The secondary water supply pipeline 5 is connected to a dual-pump parallel configuration via a water supply pipeline 7. The dual-pump parallel configuration includes parallel distributed water supply pumps 10, preferably of the same model and with the same parameters, to ensure head-flow curve matching during parallel operation. In addition, one pump serves as the main pump, and the other as a standby pump. The standby pump is started at least once a month to prevent mechanical seal adhesion or bearing corrosion. The dual-pump parallel configuration is connected to a water supply tank 8 via an outlet water pipeline 9. The water supply tank 8 is connected to a water network 14, which can use tap water or softened water. A liquid level sensor 12 is installed in the water supply tank 8, and both the liquid level sensor 12 and the dual-pump parallel configuration are electrically connected to a controller 13. The signal measured by the liquid level sensor 12 in the water tank is transmitted to the controller 13 (using a PLC sensor) in the control cabinet. The measured value of the liquid level sensor 12 is compared with the set value in the controller 13. When the value is lower than the set value, the controller 13 outputs a command to stop the water pump 10 if it is running. When the measured value of the liquid level sensor 12 is higher than the set value in the controller 13, the controller 13 outputs a command to allow the water pump 10 to start running. This can prevent the water pump 10 from running dry in a waterless state, which could cause the water pump to burn out.

[0026] The dual-pump parallel configuration is equipped with filters 11, each filter 11 comprising an integrally formed filter tube 1101, an inlet pipe 1102, and an outlet pipe 1103. A filter screen 1110 is installed inside the filter tube 1101, with both ends of the filter screen 1110 sealed to the filter tube 1101 and the inlet pipe 1102, respectively. A flange 1104 is connected to the port of the filter tube 1101 via a clamp 1105. A cleaning mechanism 1111 is installed on the inner wall of the filter screen 1110, with one end of the cleaning mechanism 1111 extending out of the flange 1104 and connected to a drive motor.

[0027] The cleaning mechanism 1111 includes a rotating shaft 1111-1 connected to a brush roller 1111-2 for cleaning the bottom of the inner wall of the filter screen 1110. A rotating roller 1111-3 is mounted on the end of the brush roller 1111-2 away from the rotating shaft 1111-1. Several staggered scrapers 1111-4 are mounted on the rotating roller 1111-3 in a spiral arrangement. The staggered scrapers 1111-4 can clean impurities adhering to the inner wall of the filter screen 1110 in the middle section. A claw-shaped scraper 1111-5 is mounted on the end of the rotating roller 1111-3 away from the brush roller 1111-2. The claw-shaped scraper 1111-5 can clean the head portion of the inner wall of the filter screen 1110. In addition, since the space between the staggered scraper 1111-4 and the claw scraper 1111-5 and the filter screen 1110 is large, it will not block the water flow or affect the flow rate.

[0028] The brush roller 1111-2, the staggered scraper 1111-4, and the claw-shaped scraper 1111-5 all abut against the inner wall of the filter screen 1110 to ensure the cleaning effect.

[0029] A central hole 1106 is provided at the center of the flange 1104 for the rotating shaft 1111-1 to pass through. Supports 1107 are symmetrically mounted on both sides of the central hole 1106, and a support sleeve 1108 is integrally formed between the supports 1107. The support sleeve 1108 is rotatably connected to the rotating shaft 1111-1. The drive motor is mounted on the end face of the support sleeve 1108. By starting the drive motor, the rotating shaft 1111-1 rotates, and subsequently, the brush roller 1111-2, the staggered scraper 1111-4, and the claw-shaped scraper 11-5 on it rotate, cleaning impurities from the inner wall of the filter screen 1110.

[0030] The flange 1104 has a drain port 1109 for connecting to the sewage pipe. The sewage pipe is equipped with a drain valve. When the drain valve is opened, impurities are discharged under the action of water flow. Regular sewage discharge is required.

[0031] The operation process of this utility model is as follows:

[0032] First, the signal measured by the liquid level sensor 12 in the water tank is transmitted to the controller 13 (using a PLC sensor) in the control cabinet. Then, the measured value of the liquid level sensor 12 is compared with the set value in the controller 13. If the value is lower than the set value, the controller 13 outputs a command to stop the water supply pump 10 if it is running. When the measured value of the liquid level sensor 12 is higher than the set value in the controller 13, the controller 13 outputs a command to allow the water supply pump 10 to start running, which can prevent the water supply pump 10 from running dry in a waterless state and causing it to burn out. Finally, the filter 11 is cleaned regularly to prevent the water supply pump 10 from running dry due to blockage.

[0033] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A water supply pump protection device, comprising a plate heat exchanger (1), one side of which is connected to a heat source (2) through a primary return water pipeline (3), and the other side of which is connected to a heat user (4) through a secondary water supply pipeline (5), a circulating pump (6) being arranged on the secondary water supply pipeline (5), characterized in that: The secondary water supply pipeline (5) is connected with the double-pump parallel configuration through the water supplement pipeline (7), the double-pump parallel configuration is connected with the water supplement tank (8) through the water outlet pipeline (9), the liquid level sensor (12) is arranged in the water supplement tank (8), and the liquid level sensor (12) and the double-pump parallel configuration are electrically connected with the controller (13); the filter (11) is arranged on the double-pump parallel configuration.

2. The water supply pump protection device according to claim 1, characterized in that: The water supplement tank (8) is connected with the water network (14).

3. The water supply pump protection device according to claim 1, characterized in that: The double-pump parallel configuration comprises the water supplement pumps (10) arranged in parallel.

4. The water supply pump protection device according to claim 1, characterized by: The filter (11) comprises an integrally-formed filter pipe body (1101), a water inlet pipe body (1102) and a water outlet pipe body (1103), the filter pipe body (1101) is provided with a filter screen (1110) therein, both ends of the filter screen (1110) are sealingly connected with the filter pipe body (1101) and the water inlet pipe body (1102) respectively, a flange (1104) is connected with the port of the filter pipe body (1101) through a clamp (1105), a cleaning mechanism (1111) is arranged on the inner wall of the filter screen (1110), and one end of the cleaning mechanism (1111) penetrating out of the flange (1104) is connected with a driving motor.

5. The water supply pump protection device according to claim 4, characterized in that: The cleaning mechanism (1111) comprises a rotating shaft (1111-1), the rotating shaft (1111-1) is connected with a brush roller (1111-2), one end of the brush roller (1111-2) away from the rotating shaft (1111-1) is provided with a rotating roller (1111-3), a plurality of staggered scrapers (1111-4) are arranged on the rotating roller (1111-3), and a claw-shaped scraper (1111-5) is arranged on the end of the rotating roller (1111-3) away from the brush roller (1111-2); the brush roller (1111-2), the staggered scrapers (1111-4) and the claw-shaped scraper (1111-5) are all abutted against the inner wall of the filter screen (1110).

6. The water supply pump protection device according to claim 5, characterized in that: The plurality of staggered scrapers (1111-4) are arranged in a spiral shape on the rotating roller (1111-3).

7. The water supply pump protection device according to claim 5, characterized by: A center hole (1106) for the rotating shaft (1111-1) to penetrate out is formed in the center position of the flange (1104), supports (1107) are symmetrically arranged on both sides of the center hole (1106), a support sleeve (1108) is integrally formed between the supports (1107), and the support sleeve (1108) is rotationally connected with the rotating shaft (1111-1); the driving motor is arranged on the end face of the support sleeve (1108).

8. The water supply pump protection device according to claim 5, characterized by: A blowdown opening (1109) connected with a blowdown pipeline is formed in the flange (1104), and a blowdown valve is arranged on the blowdown pipeline.

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