Cavitation corrosion prevention device for circulating water pump of heat supply network

Abstract

The utility model discloses an anti-cavitation device for a circulating water pump of a heat supply network. The anti-cavitation device comprises a water inlet pipe and a water pump, the anti-gathering device is arranged at a water inlet of the water pump and is used for preventing gas from gathering; the gas collecting device is arranged between a water inlet pipe and the anti-gathering device; the gathering prevention device comprises a pipe joint which is flatly connected with the top of a water inlet pipe of the water pump; the gas collecting device comprises a second reducing pipe joint, a horizontal straight pipe section, a vertical pipe and an automatic exhaust valve; the automatic exhaust valve comprises a valve body, a floating ball, a guide column and a guide sleeve. The utility model has the beneficial effects that as the gas floats upwards in the fluid, the gas is prevented from entering the water pump after being gathered at the top of the pipe to cause cavitation of the water pump through the arranged pipe joint; and through the arranged second reducing pipe joint, gas in hot water can be gathered to the top of the pipeline, the gas can be conveniently discharged after being collected by an automatic exhaust valve of the horizontal straight pipe section, and cavitation of the water pump caused by the gas is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water pump application, in particular to an anti-cavitation device for a circulating water pump in a heating pipe network. Background Art

[0002] At present, our company's main products are used in the intelligent control of heating pipe networks. There are many problems reported by users during use. One of them is that the head of the water pump recommended by our company drops after one or two years of operation, and it is not good enough to maintain the stability of the pipe network pressure. The water pump manufacturer reported it to us, but there was no good solution. We observed and analyzed with the manufacturer and users of the water pumps and found that the main problem was cavitation in the water pump impeller.

[0003] Existing water pumps usually apply an anti-corrosion coating on the pump body to solve the cavitation phenomenon. Although this method has the effect of reducing the cavitation phenomenon, when the water pump transports high-temperature fluid for a long time, there is more gas in the hot water, which makes the anti-cavitation effect less effective and reduces the service life of the water pump. How to prevent cavitation has become a problem that needs to be solved.

[0004] Among the existing patents, the application number is 202221581750.9, and the name is a water pump anti-cavitation device. It discloses that a cooling pipe is embedded in the water inlet, and a rotating shaft is provided inside the cooling pipe. The two ends of the rotating shaft are respectively connected to the inner walls of the cooling pipe on both sides through bearings, and a number of rotating plates are provided around the outside of the rotating shaft. The outer walls of both sides of the rotating plates are embedded with condensing pipes distributed in an "S" shape, and a slow flow plate is also provided on the side of the outer end of the cooling pipe. Since a mechanical device is added to the water inlet, the resistance of the water flow is increased, which affects the power of the water pump.

[0005] There is also a patent with application number CN202322636030.9, named as the main water pump cavitation prevention system, which discloses a main water pump inlet pipe. The outside of the main water pump inlet pipe is provided with a pressure-stabilizing pipeline connected to it, and the end of the pressure-stabilizing pipeline is connected to an auxiliary water pump. This application requires the addition of an additional water pump, which is not economical; it needs to be solved. Utility Model Content

[0006] The purpose of the utility model is to provide a cavitation prevention device for a circulating water pump in a heating network, which can collect and discharge the gas in hot water, and set up special measures to avoid gas accumulation at the water pump inlet, thereby preventing gas from cavitating the blades of the water pump.

[0007] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0008] A cavitation prevention device for a circulating water pump in a heating network comprises a water inlet pipe and a water pump; an anti-aggregation device installed at the water inlet of the water pump to prevent gas aggregation, and a gas collecting device installed between the water inlet pipe and the anti-aggregation device.

[0009] Furthermore, the anti-aggregation device includes a pipe joint that is flush with the top of the water pump inlet pipe; the pipe joint includes a large end and a small end, the large end of the pipe joint is connected to the gas collection device; the small end of the pipe joint is connected to the water pump inlet.

[0010] Furthermore, the gas collection device includes a horizontal straight pipe section with one end sealed and connected to the water inlet pipe, a vertical pipe fixedly connected to the middle of the horizontal straight pipe section, and an automatic exhaust valve installed at the top of the vertical pipe.

[0011] Furthermore, the inner diameter of the horizontal straight pipe section is larger than the inner diameter of the water inlet pipe.

[0012] Furthermore, the gas collection device also includes a second reducer joint arranged between the horizontal straight pipe section and the water inlet pipe; the second reducer joint is connected to the horizontal straight pipe section by flat joint at the bottom of the pipe; the second reducer joint is provided with a small end and a large end; the small end of the second reducer joint is connected to the water inlet pipe; the large end of the second reducer joint is connected to the horizontal straight pipe section.

[0013] Furthermore, the diameter of the vertical pipe is equal to the diameter of the horizontal straight pipe section.

[0014] Furthermore, the automatic exhaust valve includes a valve body fixedly connected to the vertical pipe, a float arranged in the valve body, a guide column fixedly connected to the float, and a guide sleeve fixedly connected to the valve body; the guide column is slidably connected to the guide sleeve; an air outlet is provided at the center of the guide column; an air inlet is provided on the side wall of the air outlet; the guide sleeve is provided with an air outlet portion; the guide sleeve is provided with a guide hole; the guide column is slidably connected to the guide hole; the air inlet is connected to the air outlet portion through the air outlet and the guide hole.

[0015] Furthermore, a sealing ring is provided on the guide column; the sealing ring is located above the air inlet.

[0016] The positive effects of this utility model are:

[0017] Since gas tends to float upward in the fluid, pipe joints are provided to prevent gas from gathering at the top of the pipe and entering the water pump, causing cavitation in the water pump.

[0018] By setting the reducing pipe joint, the gas in the hot water can be gathered to the top of the pipeline, so that it can be collected and discharged by the automatic exhaust valve of the horizontal straight pipe section, avoiding cavitation of the water pump caused by the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 It is a structural diagram of the automatic exhaust valve;

[0021] Figure 3 This is a structural diagram of the automatic exhaust valve when exhausting;

[0022] Figure 4 Schematic diagram of the structure of the automatic exhaust valve of Example 3.

[0023] In the picture:

[0024] 1-water inlet pipe, 2-second reducing pipe joint, 3-horizontal straight pipe section, 4-vertical pipe, 5-automatic exhaust valve, 6-pipe joint, 7-water pump;

[0025] 51-valve body, 52-float, 53-guide column, 54-guide sleeve, 55-air outlet, 56-air outlet hole, 57-air inlet hole, 58-guide hole, 59-sealing ring. DETAILED DESCRIPTION

[0026] Example 1

[0027] like Figures 1 to 3 As shown,

[0028] A device for preventing cavitation of a circulating water pump in a heating network, comprising a water inlet pipe 1 and a water pump 7;

[0029] It also includes a gas collection device installed between the water inlet pipe 1 and the water inlet of the water pump 7, which automatically discharges the gas after collection; the hot water in the water inlet pipe 1 maintains a positive pressure.

[0030] The gas collection device includes a horizontal straight pipe section 3 with one end sealedly connected to the water inlet pipe 1, a vertical pipe 4 fixedly connected to the middle of the horizontal straight pipe section 3, and an automatic exhaust valve 5 installed at the top of the vertical pipe 4.

[0031] The inner diameter of the horizontal straight pipe section 3 is larger than the inner diameter of the water inlet pipe 1. In this way, the water flow is decelerated in the straight pipe section, which is convenient for the precipitation of gas, and the precipitated gas is discharged through the automatic exhaust valve 5.

[0032] In order to better gather gas, the gas collection device further includes a second reducing pipe joint 2 provided between the horizontal straight pipe section 3 and the water inlet pipe 1; the second reducing pipe joint 2 is connected to the horizontal straight pipe section 3 by a flat bottom connection; the flat bottom connection is conducive to gathering gas at the top of the pipe, which is convenient for the automatic exhaust valve 5 to collect gas;

[0033] The second reducer 2 is provided with a small end and a large end; the small end of the second reducer 2 is communicated with the water inlet pipe 1 ; the large end of the second reducer 2 is communicated with the horizontal straight pipe section 3 .

[0034] The diameter of the vertical pipe 4 is equal to the diameter of the horizontal straight pipe section 3 or the diameter of the vertical pipe 4 is slightly smaller, so as to have a sufficiently large area to collect gas.

[0035] The detailed structure of the automatic exhaust valve 5 is:

[0036] The automatic exhaust valve 5 includes a valve body 51, which has a cavity inside. A valve cover (not shown in the figure, belonging to the prior art) is provided on the top of the valve body 51. A guide sleeve 54 is connected to the valve cover by a thread. A guide post 53 is slidably connected to the guide sleeve 54. A float 52 is fixedly connected to one end of the guide post 53. An air outlet 56 for exhaust is provided at the other end of the guide post 53. The air outlet 56 is a blind hole. An air inlet 57 is provided on the side wall of the air outlet 56.

[0037] A guide hole 58 is provided in the guide sleeve 54, and the guide post 53 slides in the guide hole 58;

[0038] The side wall of the guide sleeve 54 is provided with an air outlet 55 communicating with the guide hole 58 for exhausting air.

[0039] The gas in the valve body 51 is discharged through the air inlet 57, the air outlet 56, the guide hole 58 and finally through the air outlet portion 55 on the guide sleeve 54;

[0040] The working process of this utility model is:

[0041] The gas in the water in the hot water pipe network will float upward. Since the valve body 51 is located at the highest point of the pipe network, the gas will gather at the top of the valve body 1. When the gas pressure is greater than the pressure of the water in the pipe network, the gas compresses the float 52 downward, and the float 52 drives the guide column 53 downward. When the air inlet 57 of the guide column 53 is located below the guide sleeve 54, the gas will pass through the air inlet 57, the air outlet 56, the guide hole 58, and finally through the air outlet part 55 on the guide sleeve 54. When the gas is emptied, the pressure decreases, the float 52 rises, and waits for the gas to gather and then be exhausted again.

[0042] Example 2

[0043] The difference between this embodiment and embodiment 1 is that:

[0044] like Figure 1 As shown,

[0045] In order to prevent impeller cavitation of the water pump 7, measures are added to prevent gas from gathering at the water inlet of the water pump 7 on the basis of Example 1, and an anti-gathering device is installed at the water inlet of the water pump 7 behind the horizontal straight pipe section 3 of the gas collection device.

[0046] The anti-aggregation device includes a pipe joint 6 that is flush with the top of the water inlet pipe of the water pump 7; the pipe joint 6 includes a large end and a small end, the large end of the pipe joint 6 is connected to the horizontal straight pipe section 3 of the gas collection device; the small end of the pipe joint 6 is connected to the water inlet of the water pump 7.

[0047] The pipe joint 6 is provided to prevent gas from gathering, thereby preventing the gas from causing cavitation on the impeller.

[0048] Example 3

[0049] The difference between this embodiment and embodiment 2 is that:

[0050] like Figure 4 As shown,

[0051] A sealing ring 59 is provided on the guide pillar 53 ; the sealing ring 59 is located above the air inlet 57 .

[0052] An annular groove 59 is provided on the guide post 53 , and a sealing ring 59 is provided in the annular groove to prevent air or water leakage in the gap between the guide post 53 and the guide hole 58 .

[0053] The above-mentioned embodiments are described in a relatively detailed and specific manner, expressing preferred embodiments of the present invention. They are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, they are not limited to the present invention alone, and the patent scope of the present invention cannot be limited solely by these embodiments. That is, any equivalent changes or modifications made to the spirit disclosed by the present invention, for researchers or technicians in this field, without departing from the structure of the present invention, local improvements within the system and changes and conversions between subsystems, etc., are still within the patent scope of the present invention.

Claims

1. A device for preventing cavitation of a circulating water pump in a heating network, comprising a water inlet pipe (1) and a water pump (7); characterized in that: It also includes an anti-aggregation device installed at the water inlet of the water pump (7) to prevent gas from gathering, and a gas collecting device installed between the water inlet pipe (1) and the anti-aggregation device.

2. The anti-cavitation device for a circulating water pump in a heating network according to claim 1, characterized in that: The anti-aggregation device comprises a pipe joint (6) that is flush with the top of the water inlet pipe of the water pump (7); the pipe joint (6) comprises a large end and a small end, the large end of the pipe joint (6) is connected to the gas collection device; the small end of the pipe joint (6) is connected to the water inlet of the water pump (7).

3. The anti-cavitation device for a circulating water pump in a heating network according to claim 2, characterized in that: The gas collection device comprises a horizontal straight pipe section (3) with one end in sealed communication with the water inlet pipe (1), a vertical pipe (4) fixedly connected to the middle of the horizontal straight pipe section (3), and an automatic exhaust valve (5) installed at the top end of the vertical pipe (4).

4. The anti-cavitation device for a circulating water pump in a heating network according to claim 3, characterized in that: The inner diameter of the horizontal straight pipe section (3) is greater than the inner diameter of the water inlet pipe (1).

5. The anti-cavitation device for a circulating water pump in a heating network according to claim 4, characterized in that: The gas collection device further comprises a second reducing pipe joint (2) provided between the horizontal straight pipe section (3) and the water inlet pipe (1); the second reducing pipe joint (2) is connected to the horizontal straight pipe section (3) by a pipe bottom flat connection; the second reducing pipe joint (2) is provided with a small end and a large end; the small end of the second reducing pipe joint (2) is in communication with the water inlet pipe (1); the large end of the second reducing pipe joint (2) is in communication with the horizontal straight pipe section (3).

6. The anti-cavitation device for a circulating water pump in a heating network according to claim 4, characterized in that: The diameter of the vertical pipe (4) is equal to the diameter of the horizontal straight pipe section (3).

7. The anti-cavitation device for a circulating water pump in a heating network according to claim 6, characterized in that: The automatic exhaust valve (5) comprises a valve body (51) fixedly connected to the vertical pipe (4), a float (52) arranged in the valve body (51), a guide column (53) fixedly connected to the float (52), and a guide sleeve (54) fixedly connected to the valve body (51); the guide column (53) is slidably connected to the guide sleeve (54); an air outlet (56) is provided at the center of the guide column (53); an air inlet (57) is provided on the side wall of the air outlet (56); the guide sleeve (54) is provided with an air outlet portion (55); the guide sleeve (54) is provided with a guide hole (58); the guide column (53) is slidably connected to the guide hole (58); the air inlet (57) is connected to the air outlet portion (55) through the air outlet (56) and the guide hole (58).

8. The anti-cavitation device for a circulating water pump in a heating network according to claim 7, characterized in that: A sealing ring (59) is provided on the guide column (53); the sealing ring (59) is located above the air inlet (57).

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