CN105298857B - A kind of non-return valve of big-flow self-priming centrifugal pump self-suction system - Google Patents

Abstract

The invention relates to a check valve for a self-priming system of a large-flow self-priming centrifugal pump, which includes a suction section, a valve box is installed on the suction section, and a valve seat is arranged between the valve box and the suction section. The valve seat is provided with a through hole, and the through hole communicates the valve box with the suction section; the check valve is installed in the through hole, and the check valve is connected with the sliding pair of the through hole; A nozzle inlet pipe and a jet nozzle are installed on the valve box. The invention has the beneficial effects of simple structure, reliable action, good sealing performance, easy casting, convenient assembly and maintenance, and low cost.

Description

A non-return valve for a self-priming system of a large-flow self-priming centrifugal pump

technical field

The invention relates to a check valve of a novel large-flow self-priming centrifugal pump self-priming system.

Background technique

Through extensive market research on large-flow self-priming centrifugal pump units, the existing problems of large-flow self-priming centrifugal pump units are summarized: the self-priming principle and structure of self-priming centrifugal pumps are single, the new self-priming structure and self-priming The research on the principle is not deep enough, and the self-priming performance of large-flow self-priming centrifugal pumps is difficult to meet the needs of water-saving and energy-saving irrigation and the market; domestic manufacturers of large-flow self-priming centrifugal pump units are few, and among domestic self-priming centrifugal pump manufacturers , mainly producing self-priming centrifugal pumps with internal mixing and external mixing structures, lack of innovation, and cannot solve the self-priming performance of large-flow self-priming centrifugal pumps.

For this reason, the applicant proposes a check valve used in the self-priming system of a new type of large-flow self-priming centrifugal pump. It runs integrally with the pump, and the whole system is driven by a diesel engine. Its characteristics are: simple structure, reliable operation, good sealing performance, easy casting, convenient assembly and maintenance, and low cost.

Contents of the invention

The object of the present invention is to provide a check valve used in the self-priming system of a large-flow self-priming centrifugal pump. The check valve is used in the self-priming system, so that the self-priming pump does not need additional auxiliary devices and is completely integrated with the pump. Running, the whole system is driven by a diesel engine.

In order to achieve the above object, the technical solution adopted by the present invention is: a check valve for a self-priming system of a large-flow self-priming centrifugal pump, including a suction section, a valve box is installed on the suction section, and the valve box is connected to the A valve seat is provided between the suction sections, and a through hole is provided on the valve seat, and the through hole communicates the valve box with the suction section; the check valve is installed in the through hole, and the check valve The valve is connected with the sliding pair of the through hole; the nozzle inlet pipe and the jet nozzle are installed on the valve box.

In the above scheme, the valve seat is provided with a valve seat arc surface around the through hole, and the check valve is a four-claw bowl check valve, and the four-claw bowl check valve is located at the center of the valve box. One end is provided with a bowl-shaped arc surface, and the valve seat arc surface can fit and seal with the bowl-shaped arc surface; the four-claw bowl-type check valve is provided with a spacer at one end of the suction section.

In the above solution, the diameter of the bowl arc surface of the four-claw bowl check valve is 40 mm, and the spacers are four identical rubber spacers evenly distributed.

In the above solution, the sliding height of the four-claw bowl check valve in the through hole is 7%-14% of the total height of the four-claw bowl check valve.

In the above solution, the nozzle inlet pipe and the central axis of the jet nozzle are collinear.

In the above solution, a filter screen is also provided on the suction section, and the filter screen is located below the check valve.

In the above solution, the filter screen is bent into an arc with a central angle of 90 degrees, and the material is copper.

In the above solution, the valve seat and the valve box are fixedly connected by bolts.

In the above scheme, the inner diameter of the valve seat is 16 mm, the height is 19 mm, and its material is copper.

In the above solution, the material of the suction section and the valve box are both HT200.

Beneficial effects of the present invention: (1) The non-return valve of the present invention is used in the self-priming system, so that the self-priming pump does not need additional auxiliary devices, and is completely integrated with the pump. (2) The structure is simple, the action is reliable, and the sealing performance is good , easy to cast, easy to assemble and maintain, and low cost.

Description of drawings

Fig. 1 is a structural schematic diagram of a check valve of the present invention.

detailed description

The technical solution of the present invention will be described in more detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a check valve for a self-priming system of a large-flow self-priming centrifugal pump includes a suction section 1 on which a valve box 4 is installed, and the valve box 4 is connected to the suction section 1. A valve seat 3 is provided between them, and a through hole is provided on the valve seat 3, and the through hole communicates the valve box 4 with the suction section 1; the check valve 5 is installed in the through hole, so that The check valve 5 is connected with the through-hole sliding pair; the valve box 4 is equipped with a nozzle intake pipe 7 and a jet nozzle 6 . The valve seat 3 is provided with a valve seat arc surface 3-1 around the through hole, the check valve 5 is a four-claw bowl check valve, and the four-claw bowl check valve is located in the valve box One end of 4 is provided with a bowl-shaped arc surface 5-1, and the valve seat arc surface 3-1 can fit and seal with the bowl-shaped arc surface 5-1; the four-claw bowl-type check valve is located in the suction section 1 One end of is provided with spacer 5-2. Preferably, the inner diameter of the valve seat 3 is 16mm and the height is 19mm, the diameter of the bowl arc surface 5-1 of the four-claw bowl check valve is 40mm, and the spacers 5-2 are four evenly distributed The same rubber spacer, the sliding height of the four-claw bowl check valve in the through hole is 7%-14% of the total height of the four-claw bowl check valve, which can better ensure the working efficiency of the check valve achieve the best. Preferably, the central axes of the nozzle inlet pipe 7 and the jet nozzle 6 are collinear, so that the gas in the nozzle inlet pipe 7 is directly ejected from the jet nozzle 6 , and better forms a low-pressure area in the valve box 4 . Preferably, the suction section 1 is further provided with a filter screen 2, the filter screen 2 is located below the check valve 5, the filter screen 2 is bent into an arc with a central angle of 90 degrees, and the material is copper.

Preferably, the valve seat 3 is fixedly connected to the valve box 4 by bolts, and its material is copper. The material of the suction section 1 and the valve box 4 are both HT200.

The working principle of the check valve of the present invention is as follows: before the pump starts to work, the suction section 1 is filled with air, and the upper and lower sides of the four-claw bowl check valve 5 are all air at atmospheric pressure. Due to its own gravity, the four-claw bowl check valve The check valve 5 is embedded in the valve seat 3, the four-claw bowl check valve 5 is in a sealed state, and the entire check valve is closed; 6 is connected to the air compressor through the nozzle inlet pipe 7, the compressed air generated by the air compressor enters the jet nozzle 6 and produces jet flow, which makes the pressure at the suction port 8 of the nozzle drop sharply, and the upper space of the four-claw bowl check valve 5 gradually Negative pressure is generated, and the lower part is atmospheric pressure. Due to the pressure difference, when the differential pressure is greater than the gravity of the four-claw bowl check valve 5, the four-claw bowl check valve 5 is pushed upward, and the air in the suction section 1 is Pumped into the valve box 4 and discharged by the jet nozzle, the gas in the pump chamber is continuously entrained into the jet nozzle, and is discharged from the gas outlet of the nozzle together with the compressed air. Since four identical rubber spacers are evenly distributed on the lower end of the four-claw bowl check valve 5, the four-claw bowl check valve 5 will not be sucked away together. When the gas in the pump chamber is completely discharged from the suction section 1, the liquid medium fills the suction section 1, and there is no more air in the suction section 1, and a negative pressure will be generated inside, which is lower than the pressure in the valve box 4. Due to the pressure difference, The four-claw bowl check valve 5 is pressed down, the four-claw bowl check valve 5 is sealed, the check valve is closed, and the pump starts to work normally. Since the suction section is kept full of liquid during the working process, that is, the negative pressure state , so the four-claw bowl check valve 5 will always be sealed, the check valve is always closed, the working medium will not be sucked into the valve box 4 through the four-claw bowl check valve 5, and will not affect the normal operation of the pump Work.

Claims (8)

1. a kind of non-return valve of big-flow self-priming centrifugal pump self-suction system, it is characterised in that including suction casing (1), the suction Clack box (4) is installed in section (1), is provided with valve seat (3) between the clack box (4) and the suction casing (1), on the valve seat (3) Provided with through hole, the through hole connects the clack box (4) with the suction casing (1)；Check-valves (5) is arranged in the through hole, The check-valves (5) is connected with the through hole sliding pair；Nozzle air inlet pipe (7) and jet nozzle are installed on the clack box (4) (6)；Valve seat cambered surface (3-1) is surrounded by positioned at the through hole on the valve seat (3), the check-valves (5) is four paws bowl formula Check-valves, one end that the four paws bowl formula check-valves is located at clack box (4) are provided with bowl formula cambered surface (5-1), the valve seat cambered surface (3-1) Being capable of gluing, sealing with the bowl formula cambered surface (5-1)；One end that the four paws bowl formula check-valves is located at suction casing (1) is provided with spacer block (5-2)；The central shaft of the nozzle air inlet pipe (7) and the jet nozzle (6) is conllinear.

A kind of 2. non-return valve of big-flow self-priming centrifugal pump self-suction system according to claims 1, it is characterised in that institute A diameter of 40mm of the bowl formula cambered surface (5-1) of four paws bowl formula check-valves is stated, the spacer block (5-2) is equally distributed four complete Identical rubber spacer block.

A kind of 3. non-return valve of big-flow self-priming centrifugal pump self-suction system according to claims 2, it is characterised in that institute Slip height of the four paws bowl formula check-valves in through hole is stated as the total high 7%-14% of four paws bowl formula check-valves.

4. the non-return valve of a kind of big-flow self-priming centrifugal pump self-suction system according to claims 1, it is characterised in that inhale Enter and filter screen (2) is additionally provided with section (1), the filter screen (2) is located at below the check-valves (5).

5. the non-return valve of a kind of big-flow self-priming centrifugal pump self-suction system according to claim 4, it is characterised in that described Filter screen (2) is bent to the circular arc that central angle is 90 degree, and material is copper.

A kind of 6. non-return valve of big-flow self-priming centrifugal pump self-suction system according to claims 1, it is characterised in that institute Valve seat (3) is stated to be bolted to connection with the clack box (4).

A kind of 7. non-return valve of big-flow self-priming centrifugal pump self-suction system according to claims 1, it is characterised in that institute The internal diameter for stating valve seat (3) is 16mm, and height 19mm, its material is copper.

A kind of 8. non-return valve of big-flow self-priming centrifugal pump self-suction system according to claims 1, it is characterised in that institute Suction casing (1) is stated, the material of the clack box (4) is HT200.