Diaphragm pump for conveying ammonium phosphate slurry

Abstract

The utility model discloses a diaphragm pump for conveying ammonium phosphate slurry, which is characterized in that a driving motor is arranged on a cylinder body of the diaphragm pump, the driving motor is connected with a worm, the worm is connected with an eccentric wheel set, the eccentric wheel set is connected with a connecting rod through a crosshead, a plunger is arranged at the front end of the connecting rod, and the front end of the plunger is in non-contact connection with a diaphragm on an overflowing device. And the diaphragm is arranged in the middle of an overflowing pipeline in the overflowing mechanism. The plunger pump has the advantages that the diaphragm is in contact with a medium, corrosion and abrasion to the plunger caused by the direct contact mode of a traditional plunger pump and the medium are avoided, the operation cycle is prolonged, and the maintenance cycle is about one year. The maintenance cycle is prolonged, and the maintenance cost and the production cost are saved; 2, maintenance personnel are invested, the plunger pump is maintained by two persons on average, and the salary of each person is about 160000 yuan every year, and the salary of the maintenance personnel is about 160000 yuan every year; the diaphragm pump is only planned to be overhauled once every year and does not need to be maintained by a full-time maintainer; and 3, the safety risk and the environmental health risk are correspondingly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of ammonium phosphate production, in particular to a diaphragm pump for conveying ammonium phosphate slurry. Background Art

[0002] Powdered monoammonium phosphate is usually used as raw material for compound fertilizer, base fertilizer, fire extinguishing agent, etc. It has a large market demand and is also one of the leading products in major phosphate and compound fertilizer industries.

[0003] Powder spray drying is a crucial step in the production of powdered monoammonium phosphate. The high-pressure pump is also the primary piece of equipment, and the only high-pressure equipment involved. The pump transports the ammonium phosphate slurry to the top of the powder spray tower, where it undergoes high-pressure spraying and drying to produce powdered monoammonium phosphate. Therefore, the selection of the high-pressure pump directly impacts long-term stable production, labor intensity, production costs, and the on-site environment.

[0004] At present, the most common method for powdered monoammonium phosphate is to use a plunger-type high-pressure pump, which uses the plunger to reciprocately suck and discharge the slurry in the cylinder and pressurize it to the powder spraying tower.

[0005] Disadvantages of this equipment: short operating cycle and frequent fault maintenance.

[0006] 1. Because the plunger of the plunger pump is in direct contact with the material, it is mainly sealed by the sealing ring. The sealing ring is very easy to be damaged under high temperature acidic slurry and long-term reciprocating abrasion. Leakage is the most common fault of the plunger pump. After leakage, the plunger is abraded. The average service life of a set of packing and plunger is 3-7 days.

[0007] 2. Material leakage leads to poor on-site environment and increases environmental risks;

[0008] 3. Frequent maintenance increases operational safety risks;

[0009] 4. Increased spare parts and labor costs;

[0010] 5. Frequent starting and stopping lead to production fluctuations and increased production costs.

[0011] Therefore, the high failure rate of plunger pumps is the biggest pain point in the production of powdered monoammonium phosphate.

[0012] To address the pain points of powdered monoammonium phosphate production, our company has developed a high-pressure pump specifically for powdering ammonium phosphate slurries, drawing inspiration from high-pressure diaphragm pumps used in the mining industry. This patented high-pressure diaphragm pump replaces traditional high-pressure plunger pumps in powdered monoammonium phosphate production, achieving energy savings, reduced consumption, and reduced labor intensity. Summary of the Invention

[0013] In response to the problems of short operating cycle and frequent fault maintenance of the above-mentioned plunger pump, the utility model provides a diaphragm pump for conveying phosphate ammonium slurry, and its technical solution is: it consists of a diaphragm pump, a flow mechanism and a feeding mechanism, a drive motor is provided on the cylinder body of the diaphragm pump, the drive motor is connected to the worm transmission, the worm is connected to the eccentric wheel group, the eccentric wheel group is connected to the connecting rod through a cross head, a plunger is provided at the front end of the connecting rod, the front end of the plunger is non-contact connected to the diaphragm on the flow device, and the diaphragm is opened in the middle of the flow pipe in the flow mechanism.

[0014] As a preferred solution, the flow pipe is connected to one end of the feed pipe in the feed mechanism, and an inlet one-way valve is provided at the pipe mouth of the feed pipe.

[0015] As a preferred solution, an outlet one-way valve is provided at the top lining of the flow pipe.

[0016] As a preferred solution, a filter is provided on the feed pipe.

[0017] As a preferred solution, a safety valve group is provided on the feed pipeline.

[0018] As the preferred solution, because ammonium phosphate slurry has the characteristics of high temperature (120℃), high viscosity, high specific gravity (1.55-1.60g / ml), acid corrosion (PH value 3.8-4), and crystal abrasion, the cylinder body and filter in this solution are made of 316L stainless steel, the outlet one-way valve, inlet one-way valve, and safety valve group are all made of 2507 stainless steel, and the diaphragm is made of EPDM rubber.

[0019] As a preferred solution, when the pressure in the cylinder exceeds the set value, the safety valve group can be automatically opened to discharge the material, thereby achieving a safe pressure relief effect.

[0020] As a preferred solution, the diaphragm pump is interlocked with the inlet one-way valve and the outlet one-way valve. When the crosshead drives the plunger to move backward, the outlet one-way valve is closed and the inlet one-way valve is opened. When the crosshead drives the plunger to move forward, the outlet one-way valve is opened and the inlet one-way valve is closed.

[0021] Beneficial effects of the utility model:

[0022] This device uses a diaphragm to contact the medium, avoiding the corrosion and abrasion of the plunger caused by the direct contact between the traditional plunger pump and the medium, extending the operating cycle and the maintenance cycle is about once a year.

[0023] 1. The extension of the maintenance cycle saves maintenance costs and production costs. The diaphragm pump is about RMB 30,000 per unit per year (excluding labor); the plunger pump is overhauled every 15-20 days, with a maintenance fee of RMB 25,000 per time;

[0024] 2. Maintenance personnel input: In a powdered monoammonium phosphate plant, an average of two people are dedicated to maintaining the plunger pump. Based on an annual salary of 80,000 yuan per person, the annual maintenance worker salary is approximately 160,000 yuan. However, diaphragm pumps are only scheduled for maintenance once a year and do not require dedicated maintenance personnel.

[0025] 3. Reduce safety risks and environmental health risks accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the present utility model.

[0027] In the figure: drive motor 1, eccentric wheel group 2, worm 3, crosshead 4, connecting rod 5, outlet check valve 6, plunger 7, diaphragm 8, inlet check valve 9, safety valve group 10, filter 11, cylinder 12, feed pipe 13, flow pipe 14. DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example

[0030] like Figure 1 A diaphragm pump for conveying ammonium phosphate slurry is shown, which consists of a diaphragm pump, a flow mechanism and a feeding mechanism. A drive motor 1 is provided on the cylinder body 12 of the diaphragm pump, the drive motor 1 is connected to the worm 3, the worm 3 is connected to the eccentric wheel group 2, the eccentric wheel group 2 is connected to the connecting rod 5 through the crosshead 4, a plunger 7 is provided at the front end of the connecting rod 5, and the front end of the plunger 7 is non-contact connected to the diaphragm 8 on the flow device, and the diaphragm 8 is opened in the middle of the flow pipe 14 in the flow mechanism.

[0031] Furthermore, the flow pipe 14 is connected to one end of the feed pipe 13 in the feed mechanism, and an inlet one-way valve 9 is provided at the pipe mouth of the feed pipe 13.

[0032] Furthermore, an outlet one-way valve 6 is provided at the top lining of the flow pipe 14 .

[0033] Furthermore, a filter 11 is provided on the feed pipe 13 .

[0034] Furthermore, a safety valve group 10 is provided on the feed pipeline 13 .

[0035] Furthermore, because ammonium phosphate slurry has the characteristics of high temperature (120°C), high viscosity, high specific gravity (1.55-1.60g / ml), acid corrosion (PH value 3.8-4), and crystal abrasion, the cylinder body 12 and filter 11 in this patent are made of 316L stainless steel, the outlet one-way valve 6, the inlet one-way valve 9, and the safety valve group 10 are all made of 2507 stainless steel, and the diaphragm 8 is made of EPDM rubber.

[0036] Furthermore, when the pressure in the cylinder 12 exceeds a set value, the safety valve group 10 can be automatically opened to discharge the material, thereby achieving a safe pressure relief effect.

[0037] Furthermore, the diaphragm pump is interlocked with the inlet one-way valve 9 and the outlet one-way valve 6. When the crosshead 4 drives the plunger 7 to move backward, the outlet one-way valve 6 is closed and the inlet one-way valve 9 is opened. When the crosshead 4 drives the plunger 7 to move forward, the outlet one-way valve 6 is opened and the inlet one-way valve 9 is closed.

[0038] The above-mentioned device operates as follows: the drive motor 1 drives the worm 3 to drive the eccentric wheel group 2, and the eccentric wheel group 2 drives the crosshead 4 to operate, which in turn drives the plunger 7 to move backward to generate suction, the outlet check valve 6 automatically closes, and the inlet check valve 9 opens. The ammonium phosphate slurry with a moisture content of 18-20% and a temperature of about 120°C enters the flow pipe 14 through the filter 11 and the feed pipe 13. When the plunger 7 moves backward to the limit, the crosshead 4 pushes the plunger 7 forward in the opposite direction to generate thrust. At this time, the inlet check valve 9 automatically closes, the outlet check valve 6 opens, and the slurry in the cylinder body 12 enters the powder spraying tower through the flow pipe 14 due to the propulsion pressure of the plunger 7 and the diaphragm 8. In order to prevent the outlet pipe from being blocked or the outlet valve group from malfunctioning and failing to open, the pump is equipped with a safety valve group 10. When the pressure in the pump cavity cylinder body 12 exceeds the set value, it automatically opens to discharge the material and acts as a safety pressure relief.

Claims

1. A diaphragm pump for conveying ammonium phosphate slurry, characterized in that: The invention consists of a diaphragm pump, a flow mechanism and a feeding mechanism. A driving motor (1) is provided on the cylinder body (12) of the diaphragm pump. The driving motor (1) is connected to the worm (3) by transmission. The worm (3) is connected to the eccentric wheel group (2) by transmission. The eccentric wheel group (2) is connected to the connecting rod (5) through a cross head (4). A plunger (7) is provided at the front end of the connecting rod (5). The front end of the plunger (7) is non-contactly connected to the diaphragm (8) on the flow device. The diaphragm (8) is opened in the middle of the flow pipe (14) in the flow mechanism.

2. A diaphragm pump for conveying ammonium phosphate slurry according to claim 1, characterized in that: The flow pipe (14) is connected to one end of the feed pipe (13) in the feed mechanism, and an inlet one-way valve (9) is provided at the pipe mouth of the feed pipe (13).

3. A diaphragm pump for conveying ammonium phosphate slurry according to claim 2, characterized in that: An outlet one-way valve (6) is provided at the top lining of the flow pipe (14).

4. A diaphragm pump for conveying ammonium phosphate slurry according to claim 2, characterized in that: A filter (11) is provided on the feed pipe (13).

5. A diaphragm pump for conveying ammonium phosphate slurry according to claim 2, characterized in that: A safety valve group (10) is provided on the feed pipe (13).

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