CN204386896U - Centrifugal pump self-priming backflow self controller - Google Patents

Abstract

The utility model provides a centrifugal pump self-suction backflow self-controller, the main feature of which is that the gas-liquid separation chamber is provided with an outlet flange and a bottom flange, the inlet flange is connected to the inner sleeve and communicates with the inside of the gas-liquid separation chamber, and the gas-liquid separation chamber A float is set in the liquid separation chamber, and the float is covered with a limit sheath, and a support plate is welded outside the limit sheath. The lower part of the gas-liquid separation chamber is provided with a return pipe. One end of the lever is connected to the float, and the other end is connected to the return pipe plug. The float controls the return pipe block to close and open the return pipe through the lever. A return valve is installed on the return pipe, and a guide rod is installed under the return pipe block. There is a liquid injection hole on the top of the gas-liquid separation chamber, which is convenient for priming the pump before the first use. The advantage is that it solves the problem that the return hole of the internal backflow self-priming pump is too small and easy to be blocked, and if the backflow hole is enlarged, the internal circulation is too much and the efficiency of the self-priming pump is low. The return pipe can be opened and closed automatically without manual operation, and the safety is good, which prevents the operator from forgetting to close the return pipe, which may cause the pump efficiency to drop or fail to work normally.

Description

Centrifugal pump self-priming backflow automatic controller

technical field

The utility model relates to a centrifugal pump for lifting and self-priming working conditions under the medium liquid, in particular to a self-suction and backflow automatic controller for the centrifugal pump.

Background technique

With the gradual maturity of the self-priming pump technology, the self-priming pump has replaced the ordinary centrifugal pump with a bottom valve and needs manual pumping in the working condition of lifting the medium liquid. There are many types of self-priming pumps. Gas-liquid hybrid self-priming pumps have a small footprint, simple structure, and are widely used at low prices. The efficiency drops greatly, and the return hole is often made very thin. The return hole is too thin and often blocked. There are many faults and maintenance is frequent and the self-priming time is too long; Serious waste; 3. Manually closing the return valve is low in automation, and the user often forgets to cause the equipment to operate abnormally. The spring of the return valve is in direct contact with the medium, and it is easy to fail when transporting the medium containing more impurities, resulting in the lax closure of the return hole and self-priming The loss of pump efficiency is too large; 4. Integral structure, the transformation of the original pump can only be replaced by the whole pump, which is not suitable for the transformation of the original centrifugal pump.

Contents of the invention

The purpose of this utility model is to provide a centrifugal pump self-suction reflux auto-controller for the deficiencies in the above-mentioned technologies. The self-suction controller can be directly installed at the outlet of an ordinary centrifugal pump to transform the ordinary centrifugal pump into a self-priming pump. The reflux hole and Compared with the original self-priming pump, it is several times larger, the self-priming time is greatly shortened and it is not easy to be blocked, and the return hole is automatically opened and closed, with a high degree of automation.

The purpose of the utility model is achieved in the following way: it comprises two parts, a backflow control device and a gas-liquid separation device. The backflow control device includes a backflow pipe, a backflow valve, a guide rod, a backflow pipe plug, a lever, a float, and a limit sheath, and the gas-liquid separation device includes a gas-liquid separation chamber, an inlet and outlet flange, a liquid injection hole, and an inner sleeve. It is characterized in that the gas-liquid separation chamber is equipped with outlet and inlet flanges, the inlet flange is connected with an inner sleeve, and communicates with the inside of the gas-liquid separation chamber, the gas-liquid separation chamber is equipped with a float, the lower part of the gas-liquid separation chamber is provided with a return pipe, and one end of the lever Connect to the float, the other end is connected to the return pipe plug, and the top of the gas-liquid separation chamber is provided with a liquid injection hole. Install a return valve on the return pipe. Install the guide rod under the return pipe plug. The return pipe is connected to the inlet of the centrifugal pump. Before the first use, inject a certain amount of medium into the centrifugal pump and the gas-liquid separation chamber through the liquid injection hole. At this time, there is little medium in the gas-liquid separation chamber, the float sinks, and the return pipe inlet is opened. After the pump is started, the gas in the pump inlet pipe enters the pump, enters the impeller from the impeller suction port, fully mixes the gas and liquid in the impeller, and then enters the gas-liquid separation chamber for gas-liquid separation. When the medium with gas flows out from the inner sleeve, the liquid falls back to the bottom of the gas-liquid separation chamber due to its large specific gravity, the gas escapes from the mixed state and is discharged from the outlet of the gas-liquid separation chamber, and the medium in the gas-liquid separation chamber returns to the pump through the return pipe Inside. This reciprocates until the gas in the suction line is completely emptied, and there is no gas left in the pump. The centrifugal pump continues to run, and the liquid level in the gas-liquid separation chamber begins to rise. When the liquid level reaches the float position, the float moves up and pushes the lever to close the return hole, and the centrifugal pump enters the normal working state. In order to prevent the medium from directly washing the buoy and causing the buoy to float abnormally, two protection methods are adopted: adding a limit sheath on the outside of the buoy or adding a partition on the upper part of the inlet flange. When the form of an external limit sheath is adopted, the support plate is welded outside the limit sheath. When adopting the form of adding a partition on the upper part of the inlet flange, a limit plate is added on the upper part of the float. The centrifugal pump self-priming backflow automatic controller is installed at the outlet of the centrifugal pump.

The beneficial effects of the utility model: 1. It solves the problem that the return hole of the internal backflow self-priming pump is too small and easy to block, and if the backflow hole is enlarged, the internal circulation is too much and the self-priming pump is inefficient; 2. The return pipe is automatically opened and closed, No manual operation is required, and the safety is good, which prevents the operator from forgetting to close the return pipe and cause the pump efficiency to drop or not work normally; 3. More stable performance, low cost and easy processing, especially suitable for transforming existing ordinary centrifugal pumps into self-priming pumps; 4 1. The medium in the pump reciprocates, and only a small amount of medium is injected into the pump to discharge the gas in the suction pipeline. Compared with the existing tank-type self-priming pump, the occupied area is smaller; 5. The centrifugal pump self-priming backflow automatic controller Two-piece design with the pump body, compared with other integrated self-priming pumps, the thickness of the return pipe is not limited by the space of the pump body, and the diameter of the pipeline is several times or even dozens of times larger than the original pump type; 6. No spring, avoiding Particles and debris in the medium accumulate on the spring part, causing the valve to fail to close or not to close tightly, and the efficiency loss of the self-priming pump is too large.

Description of drawings:

Fig. 1 is the structural representation of the utility model

Figure 2 is a schematic diagram of the closed state of the return hole of the present invention

Figure 3 is a schematic diagram of adding a partition on the inlet flange of the utility model

Fig. 4 is a structural schematic diagram of the utility model applied in a horizontal pump

Fig. 5 is a structural schematic diagram of the utility model applied in a vertical pump

Fig. 6 is a schematic diagram without an inner sleeve on the inlet flange of the utility model.

Detailed ways:

Embodiment of the present invention will be further described below in conjunction with accompanying drawing:

It can be seen from Figure 1-2 that the centrifugal pump self-priming backflow automatic controller includes two parts, the backflow control device and the gas-liquid separation device, and the backflow control device includes the backflow pipe 1, the backflow valve 2, the guide rod 3, the backflow pipe plug 4, and the lever 6 , float 11 and limit sheath 7, the gas-liquid separation device includes a gas-liquid separation chamber 5, an outlet flange 8, an inlet flange 13, a liquid injection hole 10 and an inner sleeve 12. The gas-liquid separation chamber 5 is provided with an outlet flange 8, and an inlet flange 13 is provided below. The inlet flange 13 is connected to the inner sleeve 12 and communicates with the inside of the gas-liquid separation chamber 5. The gas-liquid separation chamber 5 is provided with a float 11, and the float 11 is covered Limiting sheath 7, in order to increase the strength of limiting sheath 7, weld support plate 9 outside limiting sheath 7. The lower part of the gas-liquid separation chamber 5 is provided with a return pipe 1, one end of the lever 6 is connected to the float 11, and the other end is connected to the return pipe plug 4, and the float 11 controls the return pipe plug 4 to close and open the return pipe 1 through the lever 6, and a return valve is installed on the return pipe 1 2 It is used to manually close the return hole in case the automatic control device fails. In order to prevent that the position of the backflow pipe plug 4 is too large, a guide rod 3 is installed below the backflow pipe plug 4 . The top of the gas-liquid separation chamber 5 is provided with a liquid injection hole 10 to facilitate filling the pump before the first use, and a suction line 17 is added in front of the pump inlet flange, and the suction line 17 is connected to the inlet pipe 16 to ensure that the storage medium in the pump is sufficient to realize the self-priming function.

What Figure 1 shows is that the float sinks and the return hole is opened.

As shown in FIG. 3 , the structure of adding a partition plate 14 on the inlet flange 13 is adopted to avoid direct washing of the buoy 11 by the medium. In order to prevent the lever from bending under the long-term erosion of the medium, a limit plate 15 is added to the upper part of the float.

As shown in Fig. 6, the inner sleeve 13 can be eliminated according to different working conditions in specific applications, the inlet flange 13 is directly connected to the gas-liquid separation chamber 5, and there is no inner sleeve on the inlet flange.

Claims (5)

1. A centrifugal pump self-priming backflow self-controller, including two parts, a backflow control device and a gas-liquid separation device, wherein the backflow control device includes a backflow pipe, a backflow valve, a guide rod, a backflow pipe plug, a lever, a float and a limit sheath , The gas-liquid separation device includes a gas-liquid separation chamber, an inlet and outlet flange, a liquid injection hole and an inner sleeve. It is characterized in that the gas-liquid separation chamber is provided with outlet and inlet flanges. The inside of the separation chamber is connected, a float is installed in the gas-liquid separation chamber, and a return pipe is arranged at the lower part of the gas-liquid separation chamber. One end of the lever is connected to the float, and the other end is connected to the return pipe plug. Install the guide rod under the return pipe plug. 2. The centrifugal pump self-priming backflow self-controller according to claim 1, characterized in that a separator is added to the inlet flange, and a limit plate is added to the upper part of the float. 3. The centrifugal pump self-suction backflow automatic controller according to claim 1, wherein the return pipe communicates with the suction line at the inlet of the centrifugal pump. 4. The centrifugal pump self-priming backflow automatic controller according to claim 1, characterized in that there is no inner sleeve on the inlet flange. 5. The centrifugal pump self-priming backflow automatic controller according to claim 1, characterized in that the centrifugal pump self-priming backflow automatic controller is installed at the outlet of a horizontal pump or a vertical pump.