阅读说明：本技术 一种核级往复式液压隔膜泵 (Nuclear-grade reciprocating hydraulic diaphragm pump ) 是由 王天周 陈礼 郭伟 王文文 符义红 霍开子 于 2020-05-18 设计创作，主要内容包括：本发明涉及隔膜泵领域,具体公开了一种核级往复式液压隔膜泵。包括缸体和柱塞,缸体上设有泵进口和泵出口,缸体内固定有隔膜,隔膜将缸体内腔分隔为液压腔和介质腔,柱塞与液压腔侧壁滑动密封,泵进口和泵出口均与介质腔连通；缸体上设有与液压腔上端连通并可封闭的排气通道。本发明的核级往复式液压隔膜泵可以提高核级泵的使用寿命,避免含辐射介质频繁、大量泄漏。(The invention relates to the field of diaphragm pumps, and particularly discloses a nuclear-grade reciprocating hydraulic diaphragm pump. The hydraulic cylinder comprises a cylinder body and a plunger, wherein a pump inlet and a pump outlet are arranged on the cylinder body, a diaphragm is fixed in the cylinder body, the diaphragm divides an inner cavity of the cylinder body into a hydraulic cavity and a medium cavity, the plunger is in sliding seal with the side wall of the hydraulic cavity, and the pump inlet and the pump outlet are both communicated with the medium cavity; the cylinder body is provided with an exhaust passage which is communicated with the upper end of the hydraulic cavity and can be closed. The nuclear-grade reciprocating hydraulic diaphragm pump can prolong the service life of the nuclear-grade pump and avoid frequent and large-amount leakage of the medium containing radiation.)

1. The utility model provides a reciprocating type hydraulic pressure diaphragm pump of nuclear level, includes cylinder body and plunger, be equipped with pump inlet and pump export on the cylinder body, its characterized in that: a diaphragm is fixed in the cylinder body, the diaphragm divides an inner cavity of the cylinder body into a hydraulic cavity and a medium cavity, the plunger is in sliding seal with the side wall of the hydraulic cavity, and the pump inlet and the pump outlet are both communicated with the medium cavity; and the cylinder body is provided with an exhaust channel which is communicated with the upper end of the hydraulic cavity and can be closed.

2. A nuclear grade reciprocating hydraulic diaphragm pump according to claim 1 wherein: the exhaust channel is communicated with an exhaust groove.

3. A nuclear grade reciprocating hydraulic diaphragm pump according to claim 2 wherein: the hydraulic cavity is communicated with a hydraulic medium collecting tank.

4. A nuclear grade reciprocating hydraulic diaphragm pump according to claim 3 wherein: the exhaust groove is communicated with the hydraulic medium collecting groove.

5. The nuclear grade reciprocating hydraulic diaphragm pump of claim 4 wherein: the diaphragm includes membrane portion and annular installation department, the installation department is fixed with membrane portion, and the installation department is located the periphery of membrane portion, the thickness of installation department is greater than the thickness of membrane portion.

6. A nuclear grade reciprocating hydraulic diaphragm pump according to claim 1 wherein: one side of the diaphragm, which is close to the medium cavity, is provided with a medium side limiting plate, the medium side limiting plate is fixed with the inner wall of the cylinder body, and a gap for the medium to pass through is arranged between the medium side limiting plate and the side wall of the medium cavity.

7. The nuclear grade reciprocating hydraulic diaphragm pump of claim 6 wherein: the medium side limiting plate is provided with a plurality of medium through holes.

8. The nuclear grade reciprocating hydraulic diaphragm pump of claim 6 wherein: one side of the diaphragm, which is close to the hydraulic cavity, is provided with a hydraulic side limiting plate, and a gap for liquid to pass through is arranged between the hydraulic side limiting plate and the side wall of the hydraulic cavity.

9. A nuclear grade reciprocating hydraulic diaphragm pump according to claim 8 wherein: and a plurality of hydraulic medium through holes are formed in the hydraulic side limiting plate.

10. A nuclear grade reciprocating hydraulic diaphragm pump according to claim 8 or 9 wherein: the upper end of the hydraulic side limiting plate is provided with a guide channel, and one end of the guide channel, which is close to the diaphragm, is positioned at the upper end of a space between the diaphragm and the hydraulic side limiting plate.

Technical Field

The invention relates to the field of diaphragm pumps, in particular to a nuclear-grade reciprocating hydraulic diaphragm pump.

Background

Nuclear power plant systems include various types of pumps, wherein nuclear-grade pumps are generally used for conveying media containing radiation, small-flow and high-pressure nuclear-grade pumps are basically key devices of the nuclear power plant systems which need to perform safety functions, particularly a filling pump is one of the most key devices of a chemical and volume control (KBA) system, and a plunger type reciprocating pump is generally adopted at present, namely a plunger is in direct contact with the conveying medium of the pump, and the filling material at the position of the plunger is used for sealing the high-pressure media containing radiation.

However, the plunger packing sealing principle determines that the service life is short and leakage exists inevitably, the water containing radiation is leaked and then is generally recycled by adopting a recycling structure and discharged into a sewage system of a nuclear power plant, the leaked water cannot be recycled by adopting a complete sealing structure, and radiation can enter the running environment of a pump to cause negative influence on the environment and increase the sewage treatment difficulty and treatment cost, particularly, the water temperature is about 100 ℃ when the water is pumped and conveyed at a small flow rate, most of the leakage treatment media of the plunger sealing pair are in a steam state, the environment pollution is more serious, and the recycling difficulty is higher. In addition, in a nuclear power station, a pump for injecting high-pressure boric acid also contains easily crystallized boric acid, once the pump stops running or a pump conveying medium stays at a filler sealing part in the running process, the temperature of the medium is reduced to be lower than the crystallization temperature, crystals at the filler part cause great damage to the filler and the plunger when the pump is started, and the service life of the plunger and the filler sealing is rapidly reduced.

When the plunger seals and damages, the medium that contains radiation in the nuclear level pump can take place to leak, and is big to the operating environment pollution, when concentrating the processing to the medium recovery that leaks, handles to contain the radiation medium expense extremely high, and when keeping in repair and retrieving the medium that leaks to the nuclear level pump, the radiation in the medium causes the injury easily to the people, and the cost that will keep apart these radiations is extremely high.

In addition, for the conventional diaphragm pump, a very small amount of gas is inevitably mixed in the liquid under normal pressure, the gas is easy to precipitate when the plunger slides back and forth to increase and decrease the pressure in the hydraulic cavity, and the liquid in the hydraulic cavity is also vaporized to form gas when the pressure in the hydraulic cavity increases and decreases.

Disclosure of Invention

The invention aims to provide a nuclear-grade reciprocating hydraulic diaphragm pump, which is used for prolonging the service life of a nuclear-grade pump, discharging gas precipitated in a hydraulic cavity and avoiding frequent leakage, large amount of leakage and diaphragm rupture of a medium containing radiation.

In order to achieve the purpose, the invention adopts the following technical scheme: a nuclear-grade reciprocating hydraulic diaphragm pump comprises a cylinder body and a plunger, wherein a pump inlet and a pump outlet are formed in the cylinder body, a diaphragm is fixed in the cylinder body and divides an inner cavity of the cylinder body into a hydraulic cavity and a medium cavity, the plunger is in sliding seal with the side wall of the hydraulic cavity, and the pump inlet and the pump outlet are both communicated with the medium cavity; the cylinder body is provided with an exhaust passage which is communicated with the upper end of the hydraulic cavity and can be closed.

The beneficial effect of this scheme does:

1. according to the invention, the medium containing radiation enters the medium cavity from the pump inlet and is then discharged from the pump outlet, and the diaphragm plays a sealing role on the medium cavity, so that the medium cannot enter the hydraulic cavity, and therefore, even if the plunger is damaged in sealing, the medium cannot leak from the damaged part, thereby preventing the radiation in the medium from damaging the environment and human body, and reducing the high cost caused by the medium leakage for recovering the medium.

2. When the pump is used, gas formed by separation and vaporization can be discharged along the exhaust channel, so that damage to the diaphragm caused by overlarge pressure in the hydraulic cavity is avoided, and the service life of the diaphragm is prolonged.

Further, the exhaust channel is communicated with an exhaust groove.

The beneficial effect of this scheme does: because the hydraulic pressure intracavity is full of liquid, so when discharge gas, a small amount of liquid also discharges thereupon, and gas and a small amount of liquid enter the air discharge duct after the hydraulic pressure chamber is discharged in this scheme, and liquid gathers in the air discharge duct bottom under self action of gravity and is collected. The recoverable used repeatedly of liquid in this scheme avoids liquid extravagant.

Further, the hydraulic cavity is communicated with a hydraulic medium collecting tank.

The beneficial effect of this scheme does: liquid is stored in the hydraulic medium collecting tank, after the liquid in the hydraulic cavity is discharged along with gas, the liquid in the hydraulic medium collecting tank can enter the hydraulic cavity, the liquid in the hydraulic cavity is quickly supplemented, and the phenomenon that the diaphragm cannot be driven and a medium is pumped due to too little liquid is avoided.

Further, the exhaust groove is communicated with the hydraulic medium collecting groove.

The beneficial effect of this scheme does: the liquid collected in the exhaust groove can be led into the hydraulic medium collecting groove and directly recycled.

Further, the diaphragm includes membrane portion and annular installation department, the installation department is fixed with membrane portion, and the installation department is located the periphery of membrane portion, the thickness of installation department is greater than the thickness of membrane portion.

The beneficial effect of this scheme does: the thickness of installation department is great, and when the installation, elastic deformation can take place for the installation department, avoids appearing the gap between diaphragm and the cylinder body, leads to the medium infiltration of medium intracavity to the negative pressure intracavity.

Furthermore, one side of the diaphragm, which is close to the medium cavity, is provided with a medium side limiting plate, the medium side limiting plate is fixed with the inner wall of the cylinder body, and a gap for the medium to pass through is arranged between the medium side limiting plate and the side wall of the medium cavity.

The beneficial effect of this scheme does: the medium side limiting plate limits the distance of the diaphragm which swells towards one side close to the medium cavity, the phenomenon that the diaphragm swells towards one side close to the medium cavity to the excessive degree when the plunger slides towards one side close to the medium cavity to enable the pressure in the hydraulic cavity to be excessively increased due to the fact that the pressure in the hydraulic cavity is excessively increased due to the fact that the pressure in.

Further, a plurality of medium through holes are arranged on the medium side limiting plate.

The beneficial effect of this scheme does: in the process of the diaphragm swelling, the size of the space between the diaphragm and the medium side limiting plate is continuously changed, and when the space is increased, the medium in the medium cavity enters the space; when the space reduces, the medium in the space is discharged, and the medium through hole increases the space between diaphragm and the medium side limiting plate and the communicating space of medium chamber for the medium is at the space between diaphragm and the medium side limiting plate and the flow speed between the medium chamber to make the diaphragm can the rapid change.

Furthermore, one side of the diaphragm, which is close to the hydraulic cavity, is provided with a hydraulic side limiting plate, and a gap for liquid to pass through is arranged between the hydraulic side limiting plate and the side wall of the hydraulic cavity.

The beneficial effect of this scheme does: similar with the effect of medium side restriction board, the hydraulic pressure side restriction board in this scheme can restrict the range of waving of diaphragm, avoids the plunger to keeping away from medium chamber one side sliding distance too big, leads to the diaphragm to break.

Furthermore, a plurality of hydraulic medium through holes are arranged on the hydraulic side limiting plate.

The beneficial effect of this scheme does: the hydraulic medium through hole can accelerate the flow speed of the hydraulic medium between the space between the diaphragm and the hydraulic side limiting plate and the hydraulic cavity, so that the diaphragm can be changed rapidly.

Furthermore, a guide channel is arranged at the upper end of the hydraulic side limiting plate, and one end of the guide channel, which is close to the diaphragm, is positioned at the upper end of a space between the diaphragm and the hydraulic side limiting plate.

The beneficial effect of this scheme does: when the hydraulic pressure side limiting plate is used, the hydraulic medium in the space between the diaphragm and the hydraulic pressure side limiting plate can also generate gas, and the gas is easy to accumulate in the space between the diaphragm and the hydraulic pressure side limiting plate.

Drawings

FIG. 1 is a full sectional view of example 1 of the present invention;

fig. 2 is a full sectional view of embodiment 2 of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the hydraulic pressure cavity comprises a hydraulic pressure cavity 1, a plunger 2, a medium cavity 3, a cylinder body 4, an exhaust valve group 5, an exhaust channel 6, an oil discharge valve group 7, a hydraulic pressure side limiting plate 8, a diaphragm 9, a medium side limiting plate 10, a medium through hole 11, an oil supplementing channel 12, a pump inlet 13, a liquid inlet 14, a cylinder cover 16, a liquid supplementing pipe 17, a valve cover 18, a spring 19, a sealing plate 20, a valve seat 21, a flange 22, an exhaust groove 23 and a guide channel 81.