Flow-expandable hose diaphragm pump control system and control method

Abstract

The invention provides a flow-expandable hose diaphragm pump system and a control method. Comprising a feeding one-way valve (101), a discharging one-way valve (102), a diaphragm chamber (103), a propulsive liquid actuator (104), a closed variable pump (1), a cooling flush valve (2), an overflow valve (3), a first one-way valve (4), a second one-way valve (5), a double-acting actuator (6) and a variable rotating speed motor (7). The closed variable pump (1) is connected with the double-acting actuator (6); and the double-acting actuator (6) is connected with the diaphragm chamber (103) through the propulsive liquid actuator (104). The conveying loop of each diaphragm chamber (103) is an independent unit and is realized by increasing or reducing the number of the conveying loops of the diaphragm chambers and the single displacement, and the adaptability of the control system is high. Left-right staggered reciprocating control over movement of the double-acting actuator is achieved, the stacking speed of the double cylinders is always stable, flow pulsation in the conveying process is small, and the energy-saving efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of diaphragm pumps for slurry pipeline transportation, and in particular relates to a control system and a control method for a hose diaphragm pump with expandable flow rate. Background Art

[0002] Traditional reciprocating diaphragm pumps at home and abroad usually use mechanical crankshaft drive. In order to achieve stable high pressure and ultra-large flow delivery for a single diaphragm pump, the flow expansion and pulsation elimination of the diaphragm pump can only be achieved by increasing the number of working cylinders and the stroke. The design of the crank-connecting rod mechanism limits the compactness and lightness of the pump. The crankshaft of the multi-cylinder large-flow high-pressure pump is large in size, difficult to process and has high manufacturing costs. In addition, the increase in stroke affects the service life of the one-way valve and diaphragm.

[0003] In view of the technical defects of the above-mentioned mechanical crankshaft driven reciprocating diaphragm pump, there is an urgent need for a compact, low-pulsation, long-life diaphragm pump that can achieve flow expansion without increasing the stroke. Summary of the invention

[0004] The purpose of the present invention is to provide a flow-expandable hose diaphragm pump control system and control method. The present invention solves the problems of high cost, large flow pulsation and short service life of inlet and outlet one-way valves of current high-pressure and large-flow diaphragm pumps.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention relates to a hose diaphragm pump system with expandable flow rate, comprising: a feed check valve 101, a discharge check valve 102, a diaphragm chamber 103, a propulsion liquid actuator 104, a closed variable pump 1, a cooling flushing valve 2, a relief valve 3, a first check valve 4, a second check valve 5, a double-acting actuator 6, and a variable speed motor 7;

[0007] The closed variable pump 1 is connected to the double-acting actuator 6. The power of the present invention is that the closed variable pump 1 is directly connected to drive the double-acting actuator 6;

[0008] The double-acting actuator 6 is connected to the diaphragm chamber 103 via a propulsion fluid actuator 104;

[0009] The discharge check valve 102 and the feed check valve 101 are respectively arranged at the upper and lower ends of the diaphragm chamber 103;

[0010] The double-acting actuator 6 is provided with a displacement sensor, and the piston rods on both sides of the double-acting actuator 6 are respectively connected to the diaphragm chamber 103 through the propulsion liquid actuator 104, the oil outlet of the propulsion liquid actuator 104 is connected to the outer side of the diaphragm of the diaphragm chamber 103, the inner inlet of the diaphragm of the diaphragm chamber 103 is connected to the feed check valve 101, the feed check valve 101 is connected to the feed port pipeline, the inner outlet of the diaphragm in the diaphragm chamber is connected to the discharge check valve, and the discharge check valve 102 is connected to the discharge port pipeline;

[0011] The oil port A of the double-acting actuator 6 is connected to the high-pressure oil outlet A0 on one side of the main oil circuit of the closed variable pump 1, and the high-pressure oil outlet A0 is connected in parallel to the pressure oil port of the cooling flushing valve 2 and the oil inlet of the second one-way valve 5 in sequence, and the oil outlet of the second one-way valve 5 is connected to the oil inlet of the relief valve 3, and the return oil ports of the cooling flushing valve 2 and the relief valve 3 are connected to the main oil pipe T0 and returned to the oil tank;

[0012] The oil port B of the double-acting actuator 6 is connected to the high-pressure oil outlet B0 on ​​one side of the main oil circuit of the closed variable pump 1. The high-pressure oil outlet B0 is connected in parallel to the pressure oil port of the cooling flushing valve 2 and the oil inlet of the first one-way valve 4. The oil outlet of the first one-way valve 4 is connected to the oil inlet of the overflow valve 3.

[0013] Preferably, the closed variable pump 1 includes: a variable pump 1-1, a high-pressure relief valve 1-2, an oil replenishment relief valve 1-3, a pressure cut-off valve 1-4, an oil replenishment pump 1-5, a filter 1-6, and a proportional control valve 1-7; the oil drain pipe and the oil return pipe of the closed variable pump 1 are connected back to the oil tank, and the oil inlet of the oil replenishment pump 1-5 is connected to the oil tank.

[0014] The present invention also relates to a control method of the aforementioned flow-expandable hose diaphragm pump system, comprising the following steps:

[0015] When the double-acting actuator 6 moves to the left, the diaphragm chamber 103 on the left is in a material pressing condition, and the diaphragm chamber 103 on the right is in a material suction condition. The proportional control valve 1-7 in the closed variable pump 1 is given a positive signal, and B0 of the closed variable pump 1 is a high-pressure oil port, and the A0 oil port is switched to an oil suction port. The propulsion liquid actuator 104 connected to the left side of the double-acting actuator 6 drives the diaphragm chamber 103 to discharge the slurry. At this time, the left feed check valve 101 is closed, and the discharge check valve 102 is opened to transport the high-pressure slurry to the high-pressure transport network. At the same time, the propulsion liquid actuator 104 connected to the right side of the double-acting actuator 6 moves to the left to drive the right diaphragm chamber 103 to inhale the slurry. At this time, the right discharge check valve 102 is closed, and the right feed check valve 101 is opened to inhale the low-pressure slurry into the inside of the right diaphragm chamber 103.

[0016] When the double-acting actuator 6 moves to the right, the diaphragm chamber 103 on the left is in the suction condition, and the diaphragm chamber 103 on the right is in the pressure condition. The proportional control valve 1-7 in the closed variable pump 1 is given a negative signal, and A0 of the closed variable pump 1 is the high-pressure oil port, and the B0 oil port is switched to the suction port. The propulsion liquid actuator 104 connected to the right side of the double-acting actuator 6 drives the diaphragm chamber 103 to discharge the slurry. At this time, the right feed check valve 101 is closed, and the discharge check valve 102 is opened to transport the high-pressure slurry to the high-pressure transportation pipeline. At the same time, the propulsion liquid actuator 104 connected to the left side of the double-acting actuator 6 moves to the right to drive the right and left diaphragm chambers 103 to inhale the slurry. At this time, the left discharge check valve 102 is closed, and the left feed check valve 101 is opened to inhale the low-pressure slurry into the inner side of the left diaphragm chamber 103.

[0017] The present invention controls the displacement of the closed variable pump 1 by adjusting the electrical function module, realizes the uniform acceleration, uniform speed and uniform deceleration of the double-acting actuator 6, realizes the left and right staggered reciprocating control of the movement of the double-acting actuator 6, the double-cylinder superposition speed is always stable, and the flow pulsation during the delivery process is small. According to needs, the speed of the double-acting actuator can be adjusted by the variable speed motor to achieve the number of reversing times, thereby realizing accurate control and adjustment of the delivery flow.

[0018] The present invention has the following advantages:

[0019] (1) The flow-expandable hose diaphragm pump control system of the present invention has the advantages of compact structure, stable flow, low cost and high efficiency;

[0020] (2) The flow-expandable hose diaphragm pump control system involved in the present invention is powered by one or more groups of closed pump-controlled single-cylinder double-acting actuators superimposed on each other. The total output flow can be modularly expanded to meet the needs of application scenarios with different flow requirements.

[0021] (3) The present invention adopts a closed proportional variable pump to directly drive and control the double-acting actuator, and executes uniform acceleration start, uniform speed movement and uniform deceleration movement according to the set periodic function, so as to realize the left and right staggered reciprocating control of the double-acting actuator movement. The superimposed speed of the two cylinders is always stable, the flow pulsation in the conveying process is small, and the energy saving efficiency is high.

[0022] (4) Compared with the crank slider diaphragm pump driving method in the prior art, the diaphragm chamber delivery circuit of the present invention can be modularly designed. Each diaphragm chamber delivery circuit is an independent unit. Different flow specifications, especially ultra-large flow and expensive hose diaphragm pumps, can be achieved by increasing or reducing the number and single displacement of diaphragm chamber delivery circuits, and the control system has strong adaptability.

[0023] (5) The present invention can greatly reduce the reciprocating working stroke by increasing the effective volume of the diaphragm cavity and the stroke of the double-acting actuator, thereby reducing the working frequency of the one-way valve and extending its service life; the use of a closed pump-controlled double-acting actuator makes the entire power system compact.

[0024] (6) The present invention can adjust the speed of the variable speed motor and the swing angle signal of the closed variable pump according to the working conditions to achieve flow matching output, and at the same time, achieve pulsation-free transportation by staggered control of the output flow phase sequence between the modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the working principle of a diaphragm pump in the prior art;

[0026] Figure 2 It is a hydraulic control principle diagram of a closed pump-controlled single-cylinder double-acting diaphragm pump of the present invention;

[0027] Figure 3 It is a control principle diagram of the conveying circuit of multiple groups of closed pump-controlled single-cylinder double-acting diaphragm chambers of the present invention;

[0028] Figure annotation:

[0029] Figure 1 In the figure: 101 is a feed check valve, 102 is a discharge check valve, 103 is a diaphragm chamber, 104 is a propulsion fluid actuator, 105 is a slider, and 106 is a power end mechanical device;

[0030] Figure 2 In the figure: 101 is a feed check valve, 102 is a discharge check valve, 103 is a diaphragm chamber, 104 is a propulsion fluid actuator; 1 is a closed variable pump, 1-1 is a variable pump, 1-2 is a high-pressure relief valve, 1-3 is an oil replenishment relief valve, 1-4 is a pressure cut-off valve, 1-5 is an oil replenishment pump, 1-6 is a filter, 1-7 is a proportional control valve, 2 is a cooling flushing valve, 3 is a relief valve, 4 is a first check valve, 5 is a second check valve, 6 is a double-acting actuator, and 7 is a variable speed motor;

[0031] Figure 3 Middle: Ⅰ is the conveying circuit of the first group of diaphragm chambers, and Ⅱ is the conveying circuit of the 2nd to nth groups of diaphragm chambers. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments are only further descriptions of the present invention, but the protection scope of the present invention is not limited to the following embodiments.

[0033] Example

[0034] This embodiment relates to a hose diaphragm pump with expandable flow rate, such as Figure 2As shown, the oil port A of the double-acting actuator 6 provided with a displacement sensor is connected to the high-pressure oil outlet A0 on one side of the main oil circuit of the closed pump, and the high-pressure oil outlet A0 is connected in parallel with the pressure oil port of the cooling flushing valve 2 and the oil inlet of the second one-way valve 5 in sequence, the oil outlet of the second one-way valve 5 is connected to the oil inlet of the relief valve 3, and the return oil ports of the cooling flushing valve 2 and the relief valve 3 are connected to the main oil pipe T0 and returned to the oil tank; the oil port B of the double-acting actuator 6 provided with a displacement sensor is connected to the high-pressure oil outlet B0 on ​​one side of the main oil circuit of the closed pump, and the high-pressure oil outlet B0 is connected in parallel with the pressure oil port of the cooling flushing valve 2 and the oil inlet of the first one-way valve 4 in sequence, and the oil outlet of the first one-way valve 4 is connected to the oil inlet of the relief valve 3;

[0035] The piston rods on both sides of the double-acting actuator 6 equipped with a displacement sensor are respectively connected to the propulsion liquid actuator 104 connected to the left and right groups of diaphragm chambers 103, the oil outlet of the propulsion liquid actuator 104 is connected to the outer side of the diaphragm in the diaphragm chamber 103, the inner inlet of the diaphragm in the diaphragm chamber 103 is connected to the feed check valve 101, the feed check valve 101 is connected to the feed port pipeline, the inner outlet of the diaphragm in the diaphragm chamber 103 is connected to the discharge check valve 101, and the discharge check valve 101 is connected to the discharge port pipeline;

[0036] The closed variable pump device 1 comprises a variable pump 1-1, a high-pressure relief valve 1-2, an oil replenishment relief valve 1-3, a pressure cut-off valve 1-4, an oil replenishment pump 1-5, a filter 1-6 and a proportional control valve 1-7; the oil drain pipe of the closed variable pump device 1 is connected to the oil return pipe T0 to return to the oil tank, and the oil inlet of the oil replenishment pump 1-5 is connected to the oil tank T0.

[0037] See also Figure 3 The present invention relates to a control method for a flow-expandable hose diaphragm pump system, comprising Ⅰ for the first group and the second-n group of diaphragm chamber delivery control circuits; wherein Ⅰ is the first group of diaphragm chamber delivery control circuits, and Ⅱ is the second-n group of diaphragm chamber delivery control circuits. The first group and the second-n group of proportional locking circuits are respectively connected in parallel with the low-pressure feed port and the high-pressure discharge port to form multiple groups of closed pump-controlled single-cylinder double-acting diaphragm chamber delivery circuits.

[0038] When the double-acting actuator 6 of the present invention moves to the left, the left diaphragm chamber 103 is in a material pressing condition, and the right diaphragm chamber 103 is in a material suction condition. The proportional control valve 1-7 in the closed variable pump 1 is given a positive signal, and B0 of the closed variable pump 1 is a high-pressure oil port, and the A0 oil port is switched to an oil suction port. The left propulsion liquid actuator 104 connected to the double-acting actuator 6 drives the diaphragm chamber 103 to discharge slurry. At this time, the left feed check valve 101 is closed, and the discharge check valve 102 is opened to transport high-pressure slurry to the high-pressure transport network. At the same time, the right propulsion liquid actuator 104 of the double-acting actuator 6 moves to the left to drive the right diaphragm chamber 103 to inhale slurry. At this time, the right discharge check valve 102 is closed, and the right feed check valve 102 is opened to inhale low-pressure slurry into the inside of the right diaphragm chamber 103.

[0039] When the double-acting actuator 6 moves to the right, the left diaphragm chamber 103 is in the suction condition, and the right diaphragm chamber 103 is in the pressure condition. The proportional control valve 1-7 in the closed variable pump 1 is given a negative signal, and A0 of the closed variable pump 1 is the high-pressure oil port, and the B0 oil port is switched to the suction port. The right-side propulsion fluid actuator 104 connected to the double-acting actuator 6 drives the diaphragm chamber 103 to discharge the slurry. At this time, the right-side feed check valve 101 is closed, and the discharge check valve 102 is opened to transport the high-pressure slurry to the high-pressure transportation pipeline. At the same time, the left-side propulsion fluid actuator 104 connected to the double-acting actuator 6 moves to the right to drive the right and left diaphragm chambers 103 to inhale the slurry. At this time, the left-side discharge check valve 102 is closed, and the left-side feed check valve 102 is opened to inhale the low-pressure slurry into the inner side of the left diaphragm chamber 103.

[0040] The present invention controls the displacement of the closed variable pump 1 by adjusting the electrical function module, realizes the uniform acceleration, uniform speed and uniform deceleration of the double-acting actuator 6, realizes the left and right staggered reciprocating control of the double-acting actuator movement, the double-cylinder superposition speed is always stable, and the flow pulsation during the delivery process is small. The speed of the double-acting actuator 6 can be adjusted by the variable speed motor 7 as needed to realize the number of reversals of the double-acting actuator 6, thereby realizing accurate control and adjustment of the delivery flow. The power system of the present invention adopts the closed variable pump 1 to directly connect and drive the double-acting actuator 6, eliminating the intermediate hydraulic control valve, reducing the energy loss in the fluid flow process, and improving the energy efficiency and response speed of the system.

[0041] For hose diaphragm pumps with ultra-large flow specifications, flow expansion can be achieved by increasing or reducing the number and displacement of the diaphragm chamber conveying control circuits. The flow adjustment range is large and the control system has strong adaptability. The system is driven by a closed pump control hydraulic system, the system oil tank volume is small, and the diaphragm pump power system is compact.

[0042] The overflow valve 3 is used to set the maximum working pressure of the diaphragm pump system for conveying slurry to prevent accidents. The flushing cooling valve 2 can replace the hydraulic oil of the closed pump control system to the oil tank through low-pressure overflow for circulating cooling to ensure long-term stable operation of the system. The replenishing pump 1-5 and filter 1-6 of the closed variable pump 1 are used to compensate for the leakage oil returned from the cooling flushing valve 2 by the double-acting actuator 6. The high-pressure overflow valve 1-2 provides protection against the pressure peak and the maximum pressure of the system when the swash plate swings rapidly. When the set pressure is reached, the pressure cut-off valve 1-4 adjusts the displacement to the minimum to prevent the high-pressure overflow valve 1-2 from operating during acceleration or deceleration. Other internal known components of the closed variable pump 1 are not introduced one by one.

[0043] Prior art Figure 1As shown, it is a schematic diagram of the working principle of a diaphragm pump in the prior art, which includes: a feed check valve 101, a discharge check valve 102, a diaphragm chamber 103, a propulsion liquid actuator 104, a slider 105, and a power end mechanical device 106.

[0044] The present invention and Figure 1 Compared with the prior art, the slider 105 and the power end mechanical device 106 are reduced, and the power system (power end) of the present application adopts a closed variable pump 1 to directly connect and drive the double-acting actuator 6, eliminating the intermediate hydraulic control valve, reducing the energy loss during the fluid flow process, and improving the energy efficiency and response speed of the system.

[0045] In addition, the diaphragm chamber 103 delivery circuit of the present invention can be modularly designed, and each diaphragm chamber 103 delivery circuit is an independent unit. Different flow specifications, especially ultra-large flow and expensive hose diaphragm pumps, can be achieved by increasing or reducing the number and single displacement of the diaphragm chamber delivery circuits, and the control system has strong adaptability.

[0046] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A hose diaphragm pump system with expandable flow, characterized in that: include: A feed check valve (101), a discharge check valve (102), a diaphragm chamber (103), a propulsion fluid actuator (104), a closed variable pump (1), a cooling flushing valve (2), a relief valve (3), a first check valve (4), a second check valve (5), a double-acting actuator (6), and a variable speed motor (7); The closed variable displacement pump (1) is connected to the double-acting actuator (6); The double-acting actuator (6) is connected to the diaphragm chamber (103) via a propulsion fluid actuator (104); The discharge check valve (102) and the feed check valve (101) are respectively arranged at the upper and lower ends of the diaphragm chamber (103); The double-acting actuator (6) is provided with a displacement sensor. The piston rods on both sides of the double-acting actuator (6) are respectively connected to the diaphragm chamber (103) through the propulsion liquid actuator (104). The oil outlet of the propulsion liquid actuator (104) is connected to the outer side of the diaphragm of the diaphragm chamber (103). The inner inlet of the diaphragm of the diaphragm chamber (103) is connected to the feed check valve (101). The feed check valve (101) is connected to the feed port pipeline. The inner outlet of the diaphragm chamber (103) is connected to the discharge check valve (102). The discharge check valve (102) is connected to the discharge port pipeline. The oil port A of the double-acting actuator (6) is connected to the high-pressure oil outlet port A0 on one side of the main oil circuit of the closed variable pump (1); the high-pressure oil outlet port A0 is connected in parallel to the pressure oil port of the cooling flushing valve (2) and the oil inlet port of the second one-way valve (5); the oil outlet port of the second one-way valve (5) is connected to the oil inlet port of the relief valve (3); the oil return ports of the cooling flushing valve (2) and the relief valve (3) are connected to the main oil pipe T0 and returned to the oil tank; The oil port B of the double-acting actuator (6) is connected to a high-pressure oil outlet B0 on ​​one side of the main oil circuit of the closed variable pump (1); the high-pressure oil outlet B0 is connected in parallel to the pressure oil port of the cooling flushing valve (2) and the oil inlet of the first non-return valve (4); the oil outlet of the first non-return valve (4) is connected to the oil inlet of the overflow valve (3).

2. The flow-expandable hose diaphragm pump system according to claim 1, characterized in that: The closed variable pump (1) comprises: a variable pump (1-1), a high-pressure relief valve (1-2), an oil replenishment relief valve (1-3), a pressure cut-off valve (1-4), an oil replenishment pump (1-5), a filter (1-6), and a proportional control valve (1-7); an oil drain pipe and an oil return pipe of the closed variable pump (1) are connected to an oil tank, and an oil inlet of the oil replenishment pump (1-5) is connected to the oil tank.

3. The control method of the flow-expandable hose diaphragm pump system according to claim 1, characterized in that: The following steps are involved: When the double-acting actuator (6) moves to the left, the diaphragm chamber (103) on the left is in a material pressing condition, and the diaphragm chamber (103) on the right is in a material suction condition. The proportional control valve (1-7) in the closed variable pump (1) is given a positive signal, and the B0 of the closed variable pump (1) is the high-pressure oil port, and the A0 oil port is switched to the suction port. The propulsion liquid actuator (104) connected to the left side of the double-acting actuator (6) drives the diaphragm chamber (103) to discharge the slurry. At this time, the left feed check valve (101) is closed, and the discharge check valve (102) is opened to transport the high-pressure slurry to the high-pressure transport network. At the same time, the propulsion liquid actuator (104) connected to the right side of the double-acting actuator (6) moves to the left to drive the right diaphragm chamber (103) to suck the slurry. At this time, the right discharge check valve (102) is closed, and the right feed check valve (101) is opened to suck the low-pressure slurry into the inside of the right diaphragm chamber (103); When the double-acting actuator (6) moves to the right, the diaphragm chamber (103) on the left is in the suction state, and the diaphragm chamber (103) on the right is in the pressure state. The proportional control valve (1-7) in the closed variable pump (1) is given a negative signal, and the A0 of the closed variable pump (1) is the high-pressure oil port, and the B0 oil port is switched to the suction port. The propulsion liquid actuator (104) connected to the right side of the double-acting actuator (6) drives the diaphragm chamber (103) to discharge the slurry. At this time, the right feed check valve (101) is closed, and the discharge check valve (102) is opened to transport the high-pressure slurry to the high-pressure transport network. At the same time, the propulsion liquid actuator (104) connected to the left side of the double-acting actuator (6) moves to the right to drive the right and left diaphragm chambers (103) to suck the slurry. At this time, the left discharge check valve (102) is closed, and the left feed check valve (101) is opened to suck the low-pressure slurry into the inner side of the left diaphragm chamber (103).

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