CN103883766B - Check valve for self-priming system - Google Patents

Abstract

The invention discloses a check valve for a self-priming system, which includes a suction section and a valve box, wherein the top of the suction section is connected to the valve box, and there is a filter screen in the suction section, which is interposed between the suction section and the valve box. It includes valve seat, flat pad block and valve box connection part. The valve seat is embedded in the bottom of the valve box and has a through hole. The flat pad block is inside the valve box and connected with the valve box. The flat pad block is the same as the above A spherical valve core is formed between the through holes of the valve seat, and the valve box connection part is located on one side of the valve box, and is used for connecting with the jet nozzle. The check valve is used in a new type of self-priming system, so that this type of pump does not need additional auxiliary devices, and it is completely integrated with the pump. The whole system is driven by a diesel engine. It has the advantages of simple structure, easy casting, convenient installation, and low cost. features.

Description

A check valve for self-priming system

technical field

The invention belongs to the field of valves, in particular to a check valve used in a self-priming system of a novel self-priming pump.

Background technique

At present, domestic self-priming pumps mostly adopt internal mixing and external mixing self-priming methods. This kind of self-priming method has relatively large defects, that is, large mechanical loss and hydraulic loss; water needs to be added to the pump chamber before the pump runs; It is difficult to achieve self-priming when encountering large flow conditions. At present, there are few studies on jet-type self-priming pumps, and the existing jet-type self-priming pumps are all external auxiliary devices, which need to be driven by two or more motors. The overall structure is more complicated and the operation is inconvenient.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a check valve with simple structure, low cost and convenient installation which is applied in the self-priming system of the new self-priming pump.

Technical scheme of the present invention:

A check valve for a self-priming system includes a suction section and a valve box. The top of the suction section is connected to the valve box, and there is a filter in the suction section, which is interposed between the suction section and the valve box, and can filter impurities flowing through the suction section.

The valve box includes a valve seat, a flat pad stopper and a valve box connection part, the valve seat is embedded in the bottom end of the valve box and has a through hole, and the flat pad stopper is inside the valve box The valve box is connected as a whole, and the integrated casting of the flat pad block does not require additional casting of the valve cover, which saves materials; the spherical valve core between the flat pad block and the through hole of the valve seat plays the role of opening and closing. The function of the check valve; the connecting part of the valve box is located on one side of the valve box, and is used for connecting with the jet nozzle.

Beneficial effects of the present invention: the present invention proposes a check valve used in the self-priming system of a new type of self-priming pump. It runs together with the pump, and the whole system is driven by a diesel engine. Its characteristics are: simple structure, easy casting, convenient installation, and low cost.

Description of drawings

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

In the figure: 1. Suction section; 2. Filter screen; 3. Valve seat; 4. Valve core; 5. Valve box; 6. Flat pad block; 7. Valve box connection.

detailed description

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

A structure of a check valve for a novel self-priming system of the present invention is shown in Figure 1, comprising: a suction section 1, a filter screen 2, a valve seat 3, a valve core 4, a valve box 5, a flat pad block 6, Valve box connection part 7.

The top of the suction section 1 is connected to the valve box 5, and there is a filter screen 2 in it, which is between the suction section 1 and the valve box 5. The filter screen 2 is hemispherical and protrudes downward by about 22mm. The material is copper, and its surface is covered with The through hole with a diameter of 1mm can filter the impurities flowing through the suction section 1. The valve box 5 part includes a valve seat 3, a flat pad stopper 6 and a valve box connection part 7, wherein a valve seat 3 is embedded between the valve box 5 and the suction section 1, and a through hole is opened on the valve seat 3 with a diameter of 16 mm. , the valve box 5 and the suction section 1 are connected through the through hole, the valve seat 3 is cylindrical and the upper port of the through hole has an annular chute inclined outward at 45 degrees; the flat pad stopper 6 is inside the valve box 5 and It is integrated with the valve box 5, since the flat pad block 6 is integrally cast with the valve box 5, there is no need to cast the valve cover separately, saving materials; between the flat pad block 6 and the through hole of the valve seat 3 is a spherical valve core 4. The spherical valve core 4 is placed on the valve seat, made of rubber, with a diameter of 25mm, and plays the role of opening and closing the check valve. The deviation between the actual center of gravity and the geometric center of gravity of the spherical valve core 4 is not greater than that of the spherical valve 5% of the radius of the core, and the lifting height of the spherical valve core 4 is 5% to 10% of its diameter, so as to ensure that the spherical valve core 4 is in a stable state when the opening state is opened, so that the gas can flow through the channel evenly and smoothly. Holes; the distance between the surface of the flat pad block 6 and the top of the spherical valve core 4 is about 5 mm, and the bottom surface of the flat pad block 6 and the contact end surface of the spherical valve core 4 are a cylindrical groove and 3 mm inwardly. The diameter is larger than the diameter of the spherical valve core 4, which can limit the movement of the spherical valve core 4 in the opening state; the valve box connecting part 7 is located on one side of the valve box 5, and is used for connecting with the jet nozzle.

In the whole check valve mentioned above, the filter screen 2 and the valve seat 3 are made of copper, the spherical valve core 4 is made of rubber, and the material of the suction section 1, the valve box 5 and the flat pad block 6 is HT200.

The working principle of the check valve is as follows: before the pump starts to work, the suction section 1 is filled with air, and the upper and lower parts of the valve core 4 are filled with air at atmospheric pressure. Due to its own gravity, the valve core 4 is pressed on the valve seat 3, and the valve The core 4 is in a sealed state, and the entire check valve is closed; when the pump starts to run, the jet nozzle starts to work, and since the valve box connection part 7 on one side of the valve box 5 is connected to the jet nozzle, the nozzle will gradually draw out the air in the valve box , the upper space of the spool 4 gradually generates negative pressure, because the lower part is atmospheric pressure, and due to the pressure difference, when the differential pressure is greater than the gravity of the spool 4, the spherical spool 4 is pushed upwards, and the air in the suction section 1 is sucked in into the valve box 5 and discharged by the jet nozzle. Due to the effect of the flat pad block 6, the spherical valve core 4 will not be sucked away together. When the gas in the pump cavity is completely discharged from the suction section 1, the liquid medium is filled with 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 5. Due to the pressure difference, The spherical valve core 4 is pressed down, the spherical valve core 4 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 state of negative pressure, the spherical valve core 4 will always be in a negative pressure state. Sealing, the check valve is always closed, and the working medium will not be sucked into the valve box 5 or even the jet nozzle through the spherical valve core 4, thus not affecting the normal operation of the pump.

Claims (7)

1. a kind of non-return valve for self-suction system, including suction casing (1) it is characterised in that: described suction casing (1) upper end is provided with Clack box (5), is embedded with valve seat (3), described valve seat (3) opens up through hole between described clack box (5) and described suction casing (1), described Clack box (5) and described suction casing (1), by described through hole insertion, described clack box (5) are additionally provided with clack box connecting portion (7), described Clack box connecting portion (7) is used for connecting jet nozzle；It is fixed with plain cushion block (6), described plain cushion block inside described clack box (5) (6) it is provided with valve element (4) and described through hole between.

2. a kind of non-return valve for self-suction system according to claim 1 it is characterised in that on described valve seat (3) The annular skewed slot of outside 45 degree of inclinations is had, described valve element (4) is spherical valve core at described through hole upper port.

3. a kind of non-return valve for self-suction system according to claim 2 is it is characterised in that described plain cushion block (6) With described spherical valve core (4) just to contact end face be a cylinder shape groove, described cylinder shape groove with diameter greater than described ball The diameter of shape valve element (4).

4. a kind of non-return valve for self-suction system according to Claims 2 or 3 is it is characterised in that described spherical valve core (4) deviation of actual center gravity and geometric center of gravity is not more than the 5% of described spherical valve core radius, the lifting of described spherical valve core (4) It is highly the 5%～10% of its diameter.

5. a kind of non-return valve for self-suction system according to claim 1 or 2 or 3 is it is characterised in that described plain cushion keeps off Block (6) is integrated casting with described clack box (5).

6. a kind of non-return valve for self-suction system according to claim 1 or 2 or 3 is it is characterised in that described suction casing (1) it is provided with filter screen (2) and described clack box (5) between.

7. a kind of non-return valve for self-suction system according to claim 6 is it is characterised in that described filter screen (2) and institute The material stating valve seat (3) is copper, and the material of described valve element (4) is rubber, described suction casing (1), described clack box (5) and described put down The material of pad block (6) is ht200.