A corrosion-resistant chemical centrifugal pump

Abstract

The present invention discloses an anti-corrosion chemical centrifugal pump, including a housing, a motor cover, a rotor, a stator, an impeller and a plurality of bearings. The housing has an inlet in the middle of one end, an outlet is arranged at the side edge, and the other end is fixedly connected to the motor cover, and a pump cavity is formed between the housing and the motor cover; the stator is connected to the inner surface of the motor cover, the rotor is rotatably connected to the stator through a plurality of bearings, one end of the rotor passes through the motor cover and extends into the pump cavity to be connected to the center of the impeller, a mechanical sealing structure is arranged between the rotor and the motor cover, and lubricating oil is poured into the motor cover; the two ends of the upper part of the motor cover are respectively connected to a purge pipe and an exhaust pipe, and the purge pipe pumps dry gas into the motor cover. The lubricating oil increases the lubrication performance and makes the rotor run smoothly; the purge pipe pumps dry gas into the motor cover, which not only maintains the dry environment inside the motor cover, but also can carry out the moisture in the motor cover, the lubricating oil contains less water, and the lubrication performance is stable.

Description

Technical Field

[0001] The invention relates to an anti-corrosion chemical centrifugal pump, in particular to a ventilation protection structure thereof. Background Art

[0002] Chemical centrifugal pumps have the advantages of simple structure, low wear, smooth operation, low noise, uniform water discharge, convenient adjustment, and high efficiency, so they have been widely used. The working principle of chemical centrifugal pumps is that when the pump is full of liquid, the impeller rotates to generate centrifugal force, so the pressure at the center of the impeller decreases. This pressure is lower than the pressure in the liquid inlet pipe, and the liquid flows into the impeller from the suction pool under the action of this pressure difference. In this way, the chemical centrifugal pump can continuously absorb water; the outlet pressure at the edge of the impeller is the highest, and it can continuously supply liquid.

[0003] However, the existing chemical centrifugal pumps have defects. Due to the complex and changeable working environment, they often work in high humidity and high temperature environments. The internal structure of the motor drive part is not completely sealed, and corrosion and rust often occur inside, causing the rotor to get stuck and the motor to be damaged. Therefore, how to prevent the internal structure of the motor drive part from corroding and rusting is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] In order to overcome the above disadvantages, the purpose of the present invention is to provide a corrosion-resistant chemical centrifugal pump to solve the defect that the motor drive part of the chemical centrifugal pump is prone to corrosion and oxidation.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: an anti-corrosion chemical centrifugal pump, including a shell, a motor cover, a rotor, a stator, an impeller and a plurality of bearings, the shell has an inlet in the middle of one end, an outlet is arranged on the side edge, and the other end is fixedly connected to the motor cover, a pump cavity is formed between the shell and the motor cover, and the impeller is arranged in the pump cavity; the stator is connected to the inner surface of the motor cover, the rotor is rotatably connected to the stator through a plurality of bearings, one end of the rotor passes through the motor cover and extends into the pump cavity and is connected to the center of the impeller, a mechanical sealing structure is arranged between the rotor and the motor cover, and lubricating oil is poured into the motor cover; the two ends of the upper part of the motor cover are respectively connected to a purge pipe and an exhaust pipe, and the purge pipe pumps dry gas into the motor cover.

[0006] The present invention is further configured as follows: the corrosion-resistant chemical centrifugal pump also includes an instrument air pipe, an instrument gas tank, a measuring air pipe and a pressure control valve, the instrument air pipe is connected to the instrument gas tank; one end of the measuring air pipe is connected to the outlet, and the other end is connected to the pressure control valve, and the pressure control valve controls the connection and disconnection between the instrument air pipe and the purge pipe according to the pressure in the measuring air pipe.

[0007] The present invention is further configured as follows: the pressure control valve includes a tubular body, a first tube cavity is provided in the tubular body, first clamps are connected to both ends of the first tube cavity, the measuring air pipe and the purge pipe are respectively connected to a pair of first clamps, and the instrument air pipe is connected to the middle of the first tube cavity; a first spring and a plug are filled between the pair of first blocks, when the pressure in the measuring air pipe is atmospheric pressure, the first spring drives the plug to move toward the measuring air pipe, and the instrument air pipe is connected to the purge air pipe; when the pressure in the measuring air pipe reaches the outlet pressure of the anti-corrosion chemical centrifugal pump, the pressure in the measuring air pipe drives the plug to move toward the purge air pipe to separate the purge pipe from the instrument air pipe.

[0008] The present invention is further configured as follows: a liquid level meter is connected to the side of the motor cover.

[0009] The present invention is further configured as follows: an oil injection device is connected to the bottom of the motor cover, the oil injection device includes a through hole arranged at the bottom of the motor cover, a connecting pipe connected to the through hole, a second tube cavity is provided in the connecting pipe, a second clamping block is provided at the end of the second tube cavity away from the through hole, a steel ball and a second spring are provided in the second tube cavity, the diameter of the steel ball is the same as the inner diameter of the second tube cavity, and the second spring drives the steel ball to block the second clamping block; a bypass pipe is provided in the middle side wall of the connecting pipe; and an annular clamping groove is provided on the outer surface of the end of the connecting pipe away from the through hole.

[0010] The present invention is further configured as follows: a mounting seat is provided on the inner surface of the side wall of the motor cover, a static ring is clamped in the mounting seat, and the static ring is connected to the end of the rotor away from the impeller.

[0011] Compared with the prior art, the beneficial effects of the present invention are: lubricating oil is poured into the motor cover to increase the lubrication performance and enable the rotor to run smoothly; a purge pipe and an exhaust pipe are respectively connected to the two ends of the upper part of the motor cover, and the purge pipe pumps dry gas into the motor cover, which not only maintains a dry environment inside the motor cover, but also can carry out the moisture in the motor cover, the lubricating oil contains less water and the lubrication performance is stable.

[0012] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an anti-corrosion chemical centrifugal pump shown in a preferred embodiment of the present invention;

[0014] Figure 2 for Figure 1 The schematic diagram of the structure with a partial enlargement of the middle circle A;

[0015] Figure 3 for Figure 1 Structural diagram of another state of the anti-corrosion chemical centrifugal pump.

[0016] In the figure: 1, outlet; 2, shell; 3, inlet; 4, impeller; 5, bearing; 6, rotor; 7, mounting seat; 8, level gauge; 9, static ring; 10, motor cover; 11, stator; 12, purge pipe; 13, pressure control valve; 14, instrument air pipe; 15, instrument air tank; 16, measuring air pipe; 17, exhaust pipe; 18, through hole; 19, connecting pipe; 20, bypass pipe; 21, slot; 22, steel ball; 23, second clamp block; 24, second tube cavity; 25, second spring; 26, first clamp block; 27, first spring; 28, plug block; 29, first tube cavity. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] See attached Figure 1-3 As shown, an anti-corrosion chemical centrifugal pump in this embodiment includes a housing 2, a motor cover 10, a rotor 6, a stator 11, an impeller 4 and a plurality of bearings 5. The housing 2 has an inlet 3 in the middle of one end, an outlet 1 is provided at the side edge, and the other end is fixedly connected to the motor cover 10. A pump cavity is formed between the housing 2 and the motor cover 10, and the impeller 4 is arranged in the pump cavity; the stator 11 is connected to the inner surface of the motor cover 10, and the rotor 6 is rotatably connected to the stator 11 through a plurality of bearings 5. One end of the rotor 6 passes through the motor cover 10 and extends into the pump cavity and is connected to the center of the impeller 4. A mechanical sealing structure is provided between the rotor 6 and the motor cover 10, and the motor cover 10 is filled with lubricating oil; the upper ends of the motor cover 10 are respectively connected to a purge pipe 12 and an exhaust pipe 17, and the purge pipe 12 pumps dry gas into the motor cover 10.

[0019] Lubricating oil is poured into the motor cover 10 to increase the lubrication performance and make the rotor 6 run smoothly; by connecting the purge pipe 12 and the exhaust pipe 17 at both ends of the upper part of the motor cover 10, the purge pipe 12 pumps dry gas into the motor cover 10, which not only maintains the dry environment inside the motor cover 10, but also can carry out the moisture in the motor cover 10. The lubricating oil contains less water and the lubrication performance is stable.

[0020] The rotating rotor 6 often throws the lubricating oil to the exhaust pipe 17. Under the action of the instrument gas, the lubricating oil flows out of the exhaust pipe 17. In order to prevent the lubricating oil from flowing out of the motor cover 10 during the operation of the rotor 6, the present invention is further configured as follows: the corrosion-resistant chemical centrifugal pump also includes an instrument gas pipe 14, an instrument gas tank 15, a measuring gas pipe 16 and a pressure control valve 13. The instrument gas pipe 14 is connected to the instrument gas tank 15; one end of the measuring gas pipe 16 is connected to the outlet 1, and the other end is connected to the pressure control valve 13. The pressure control valve 13 controls the connection and disconnection between the instrument gas pipe 14 and the purge pipe 12 according to the pressure in the measuring gas pipe 16. When the rotor 6 is stationary, the lubricating oil is in a constant non-flowing state; when the rotor 6 rotates, the instrument gas pipe 14 is disconnected from the purge pipe 12, keeping the motor housing at the same pressure as the outside pressure, no fluid flows in the exhaust pipe 17, and the lubricating oil will not flow out of the exhaust pipe 17.

[0021] The present invention is further configured as follows: the pressure control valve 13 includes a tubular body, a first tube cavity 29 is provided in the tubular body, and first clamping blocks 26 are connected to both ends of the first tube cavity 29; the measuring air pipe 16 and the purge pipe 12 are respectively connected to a pair of first clamping blocks 26, and the instrument air pipe 14 is connected to the middle of the first tube cavity 29; a first spring 27 and a plug 28 are filled between the pair of first clamping blocks 26; when the pressure in the measuring air pipe 16 is atmospheric pressure, the first spring 27 drives the plug 28 to move toward the measuring air pipe 16, and the instrument air pipe 14 is connected to the purge pipe 12; when the pressure in the measuring air pipe 16 reaches the outlet 1 pressure of the anti-corrosion chemical centrifugal pump, the pressure in the measuring air pipe 16 drives the plug 28 to move toward the purge pipe 12 to separate the purge pipe 12 from the instrument air pipe 14. The plug 28 reciprocates in the first tube cavity under the action of the pressure in the measuring air pipe 16 and the elastic force of the first spring 27; when the pressure in the measuring air pipe 16 exceeds the elastic force of the first spring 27, the first spring 27 is compressed, the plug 28 moves toward the purge pipe 12, and blocks the instrument air pipe 14, and the instrument air pipe 14 and the purge pipe 12 are blocked by the plug 28. The pressure inside the motor cover 10 will not discharge the lubricating oil from the exhaust pipe 17. When the elastic force of the first spring 27 exceeds the pressure in the measuring air pipe 16, the first spring 27 stretches, the plug 28 moves toward the measuring air pipe 16, and the instrument air pipe 14 and the purge pipe 12 are connected. Keep the inside of the motor cover 10 dry.

[0022] In order to understand the situation in the motor cover 10 and maintain a suitable lubricating oil level, the present invention is further configured as follows: a liquid level meter 8 is connected to the side of the motor cover 10 .

[0023] In order to facilitate the injection of lubricating oil into the motor housing, the present invention is further configured as follows: the bottom of the motor cover 10 is connected with an oil injection device, the oil injection device includes a through hole 18 provided at the bottom of the motor cover 10, a connecting pipe 19 connected to the through hole 18, a second tube cavity 24 is provided in the connecting pipe 19, a second clamping block 23 is provided at one end of the second tube cavity 24 away from the through hole 18, a steel ball 22 and a second spring 25 are provided in the second tube cavity 24, the diameter of the steel ball 22 is the same as the inner diameter of the second tube cavity 24, and the second spring 25 drives the steel ball 22 to block the second clamping block 23; a bypass pipe 20 is provided in the middle side wall of the connecting pipe 19; and an annular clamping groove 21 is provided on the outer surface of the end of the connecting pipe 19 away from the through hole 18. The annular clamping groove 21 is connected to an oil gun for injecting engine oil, and the structure of the oil gun is the same as that of the oil gun in the prior art, which will not be repeated here. When the steel ball 22 is subjected to the pressure of the lubricating oil pumped out by the oil gun, the second spring 25 is compressed and the steel ball 22 moves toward the through hole 18. When the steel ball 22 is in the middle of the bypass pipe 20, the force exerted on the steel ball 22 is balanced and the steel ball 22 stops moving. The lubricating oil pumped out by the oil gun flows into the motor cover 10 through the bypass pipe 20.

[0024] The present invention is further configured as follows: a mounting seat 7 is provided on the inner surface of the side wall of the motor cover 10, a stationary ring 9 is clamped in the mounting seat 7, and the stationary ring 9 is connected to the end of the rotor 6 away from the impeller 4. During the operation of the rotor 6, the stationary ring 9 acts as a thrust stop on the rotor 6 to prevent the rotor 6 from moving in the axial direction.

[0025] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant chemical centrifugal pump, comprising a housing, a motor cover, a rotor, a stator, an impeller and a plurality of bearings, wherein the housing has an inlet in the middle of one end, an outlet is arranged at the side edge, and the other end is fixedly connected to the motor cover, a pump cavity is formed between the housing and the motor cover, and the impeller is arranged in the pump cavity; the stator is connected to the inner surface of the motor cover, the rotor is rotatably connected to the stator through a plurality of bearings, one end of the rotor passes through the motor cover and extends into the pump cavity and is connected to the center of the impeller, a mechanical seal structure is arranged between the rotor and the motor cover, and is characterized in that: The motor cover is filled with lubricating oil; the two ends of the upper part of the motor cover are respectively connected with a purge pipe and an exhaust pipe, and the purge pipe pumps dry gas into the motor cover; The anti-corrosion chemical centrifugal pump also includes an instrument air pipe, an instrument air tank, a measuring air pipe and a pressure control valve, wherein the instrument air pipe is connected to the instrument air tank; one end of the measuring air pipe is connected to the outlet, and the other end is connected to the pressure control valve, and the pressure control valve controls the connection and disconnection between the instrument air pipe and the purge pipe according to the pressure in the measuring air pipe; The pressure control valve includes a tubular body, a first tube cavity in the tubular body, first clamps are connected to both ends of the first tube cavity, the measuring air pipe and the purge pipe are respectively connected to a pair of first clamps, and the instrument air pipe is connected to the middle of the first tube cavity; a first spring and a plug are filled between the pair of first blocks, when the pressure in the measuring air pipe is atmospheric pressure, the first spring drives the plug to move toward the measuring air pipe, and the instrument air pipe is connected to the purge air pipe; when the pressure in the measuring air pipe reaches the outlet pressure of the anti-corrosion chemical centrifugal pump, the pressure in the measuring air pipe drives the plug to move toward the purge air pipe to separate the purge pipe from the instrument air pipe.

2. The corrosion-resistant chemical centrifugal pump according to claim 1, characterized in that: A liquid level meter is connected to the side of the motor cover.

3. The corrosion-resistant chemical centrifugal pump according to claim 2, characterized in that: The bottom of the motor cover is connected to an oil injection device, which includes a through hole arranged at the bottom of the motor cover and a connecting pipe connected to the through hole. The connecting pipe is provided with a second tube cavity, and a second clamping block is arranged at the end of the second tube cavity away from the through hole. A steel ball and a second spring are arranged in the second tube cavity. The diameter of the steel ball is the same as the inner diameter of the second tube cavity, and the second spring drives the steel ball to block the second clamping block; a bypass pipe is arranged in the middle side wall of the connecting pipe; and an annular clamping groove is arranged on the outer surface of the end of the connecting pipe away from the through hole.

4. The corrosion-resistant chemical centrifugal pump according to any one of claims 1 to 3, characterized in that: A mounting seat is arranged on the inner surface of the side wall of the motor cover, a static ring is clamped in the mounting seat, and the static ring is connected to the end of the rotor away from the impeller.

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