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Sealed liquid ammonia pump for conveying liquid ammonia

A sealed and liquid ammonia technology, which is applied in the field of liquid ammonia pumps, can solve the problems of reduced service life of liquid ammonia pumps, increased pump internal pressure, and easy damage to internal parts, so as to reduce environmental requirements, prolong service life, and improve The effect of the cooling effect

Active Publication Date: 2022-07-29
SICHUAN MIANZHU CHUANRUN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the principle that the magnetic field can penetrate the air gap and non-magnetic medium, when the motor drives the outer magnetic rotor to rotate, the inner magnetic rotor connected to the impeller is coupled to rotate synchronously through the action of the magnetic force line, realizing the non-contact transmission of torque, by In the past, one shaft of the conventional pump was replaced with a shaft seal part and two shafts were equipped with a spacer sleeve structure, which transformed the dynamic seal into a static seal, thereby completely solving the problem of medium leakage, and was used to transport various non-leaking corrosion According to the corrosive characteristics of liquid ammonia, the existing liquid ammonia pump has completely solved the leakage problem of the liquid ammonia pump by using the principle of magnetic field transmission. , because the existing liquid ammonia pump itself does not have a cooling function, the transportation of liquid ammonia has higher requirements on the transportation environment. At the same time, when the impeller of the liquid ammonia pump rotates to transport liquid ammonia, the high-speed rotation of the impeller will generate heat. The pump body of the liquid ammonia pump heats up, causing the heated liquid ammonia to easily decompose into gas, which affects the quality of liquid ammonia and further increases the pressure inside the pump, resulting in a reduction in the service life of the liquid ammonia pump under high pressure, and the internal parts are easily damaged. In severe cases, the pump body is damaged and a large amount of liquid ammonia leaks

Method used

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  • Sealed liquid ammonia pump for conveying liquid ammonia
  • Sealed liquid ammonia pump for conveying liquid ammonia
  • Sealed liquid ammonia pump for conveying liquid ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example one, as Figure 1 to Figure 6As shown, a sealed liquid ammonia pump for liquid ammonia transportation includes a magnetic pump housing 1 and a motor 2. The output shaft of the motor 2 is connected to the main shaft 3 in the magnetic pump housing 1. Due to the particularity of liquid ammonia, It is necessary to use a liquid ammonia pump with strong airtightness to transport liquid ammonia. Therefore, a magnetic pump is used to transport liquid ammonia. The magnetic pump couples the inner magnetic rotor connected to the impeller to rotate synchronously through the action of magnetic lines of force, and realizes the torque The non-contact transmission, from the original conventional pump with a shaft seal on one shaft to two shafts with an isolation sleeve structure, converts the dynamic seal into a static seal, thus completely solving the problem of medium leakage, with super strong The tightness of the liquid ammonia meets the transportation requirements of liqui...

Embodiment 2

[0029] Embodiment 2, on the basis of embodiment 1, further, as image 3 and Figure 4 As shown, the cooling housing 4 is connected with an oil inlet pipe 14 and an oil return pipe 15 at the end of the piston chamber 5 away from the main shaft 3. The oil inlet pipe 14 and the oil return pipe 15 are respectively connected to the oil inlet hose 9 and the oil return hose 10. The oil return pipe 15 and the oil inlet pipe 14 are respectively provided with a one-way oil return valve 16 and a one-way oil inlet valve 17. When the one-way oil inlet valve 17 is turned on, the one-way oil return valve 16 is closed, and when the one-way oil return valve 16 leads When it is on, the one-way oil inlet valve 17 is closed, and the one-way oil return valve 16 and the one-way oil inlet valve 17 are both closed under normal conditions. When the piston 6 moves away from the main shaft 3, under the action of the pressure difference, the one-way oil The oil inlet valve 17 is automatically turned on,...

Embodiment 3

[0032] Embodiment 3, on the basis of embodiment 2, further, as figure 2 and Image 6 As shown, the piston chamber 5 is located below the driving chamber 13, so that the cooling oil in the piston chamber 5 cannot easily leak into the driving chamber 13 under the action of gravity. When sliding in the piston cavity 5, a gap will inevitably occur, and a small amount of overflow occurs. Therefore, on this basis, a sealing component is also provided at the connection between the cooling shell 4 and the main shaft 3 to prevent the leakage of cooling oil. Therefore, both ends of the cooling casing 4 along the axial direction of the main shaft 3 are provided with sealing grooves 32 , the axis of the sealing groove 32 is parallel to the axis of the driving cavity 13 , the diameter of the sealing groove 32 is larger than that of the driving cavity 13 , and the inner diameter of the sealing groove 32 is larger than that of the driving cavity 13 . A sealing assembly is provided. The sea...

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Abstract

The invention discloses a sealed liquid ammonia pump for conveying liquid ammonia, which comprises a magnetic drive pump shell and a motor, an output shaft of the motor is connected with a main shaft in the magnetic drive pump shell, the sealed liquid ammonia pump also comprises a cooling shell, the cooling shell is positioned between the magnetic drive pump shell and the motor, a piston cavity is arranged in the cooling shell, the axis of the piston cavity is perpendicular to the axis of the main shaft, and the piston cavity is communicated with the main shaft. Cooling oil is arranged in the piston cavity, a piston is arranged in the piston cavity in a sliding fit mode, the piston is connected with the main shaft through a connecting rod mechanism, a cooling circulation cavity is formed between the inner wall and the outer wall of the magnetic drive pump shell, an oil inlet hose and an oil return hose are connected between the cooling shell and the magnetic drive pump shell, and the two ends of the oil return hose are communicated with the piston cavity and the cooling circulation cavity respectively. The two ends of the oil inlet hose communicate with the piston cavity and the cooling circulation cavity correspondingly. The magnetic drive pump shell is cooled through circularly flowing cooling oil, the environment in the pump is improved, the conveying quality of liquid ammonia is guaranteed, the service life of the liquid ammonia pump is prolonged, and meanwhile the environment use requirement of the liquid ammonia pump is lowered.

Description

technical field [0001] The invention relates to the technical field of liquid ammonia pumps, in particular to a sealed liquid ammonia pump used for liquid ammonia transportation. Background technique [0002] Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong pungent odor, a relative density of 0.77 (liquid), a melting point of -77.7°C, and a boiling point of -33.5°C. Ammonia is an important chemical raw material. For the convenience of transportation and storage, liquid ammonia is usually obtained by pressurizing or cooling gaseous ammonia. Liquid ammonia is easily soluble in water, and forms ammonium ions NH4+ and hydroxide ions OH- after being dissolved in water. The solution is alkaline and cannot coexist with acetaldehyde, acrolein, boron and other substances, and decomposes into ammonia and hydrogen at high temperature. Liquid ammonia is widely used in industry, is corrosive and easily volatile, so its chemical accident rate is very h...

Claims

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Application Information

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IPC IPC(8): F04D29/58F04D29/42F04D13/06F04D7/00F04B9/02
CPCF04D29/5886F04D29/426F04D13/06F04D7/00F04B9/02
Inventor 杨先林许世军任明军李华涛周俊
Owner SICHUAN MIANZHU CHUANRUN CHEM CO LTD
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