Horizontal flow metering pump

Abstract

The present application discloses a horizontal flow metering pump, comprising a pump body, a crankshaft, a half-stroke plunger and a full-stroke plunger; a half-stroke cavity and a full-stroke cavity are arranged on the pump body, the half-stroke plunger and the full-stroke plunger are both slidably mounted on the pump body, one end of the half-stroke plunger is located in the half-stroke cavity, and the full-stroke plunger is located in the full-stroke cavity; the present invention has the following beneficial effects: by making the flow peak phases of the full-stroke pump cavity and the half-stroke pump cavity 180 degrees to each other, the pulsation is greatly reduced after superposition, and the flow is stable; and during the liquid suction process of the half-stroke pump cavity, the half-stroke plunger will generate a reverse thrust acting on the crankshaft, which assists the liquid discharge process of the full-stroke plunger pump head and reduces energy consumption.

Description

Technical Field

[0001] The invention relates to the field of pumps, in particular to a horizontal flow metering pump. Background Art

[0002] The metering pump has the characteristics of precise and adjustable flow rate, the flow rate is basically unaffected by the operating pressure, and can transport the medium with high precision under high pressure conditions. It is widely used in energy, petrochemical, thermal power, and other industries.

[0003] The metering pump is a positive displacement pump, so there is inevitably pulsation when conveying the medium, which will cause vibration of the pipeline system and even resonance, damaging the pipeline accessories. In order to reduce pulsation, buffers are mainly installed on the inlet and outlet pipes of the metering pump.

[0004] There are four main structures of buffers currently in use: air type, bladder type, diaphragm type and mechanical type. All four structures have disadvantages: the gas inside the air buffer will quickly dissolve into the liquid and be lost, and compressed gas needs to be added frequently; the bladder of the bladder buffer is a rubber product and cannot be used in many chemical solvents; the diaphragm buffer is only suitable for low-pressure conditions; the mechanical buffer will wear out quickly under the erosion of high-pressure and high-speed materials, and the buffering effect will decrease. Summary of the invention

[0005] In view of the above problems, the present invention proposes a horizontal flow metering pump.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A horizontal flow metering pump comprises a pump body, a crankshaft, a half-stroke plunger and a full-stroke plunger;

[0008] The pump body is provided with a half-stroke cavity and a full-stroke cavity, the half-stroke plunger and the full-stroke plunger are both slidably mounted on the pump body, one end of the half-stroke plunger is located in the half-stroke cavity, and the full-stroke plunger is located in the full-stroke cavity;

[0009] A first one-way valve is arranged on the half-stroke chamber, a second one-way valve is arranged between the full-stroke chamber and the half-stroke chamber, a third one-way valve and a liquid inlet valve are arranged on the full-stroke chamber, the first one-way valve is used to control the one-way outflow of liquid from the half-stroke chamber, the second one-way valve is used to control the one-way flow of liquid from the full-stroke chamber into the half-stroke chamber, the third one-way valve is used to control the one-way outflow of liquid from the full-stroke chamber, and the liquid inlet valve is used to control the one-way flow of liquid into the full-stroke chamber;

[0010] The crankshaft is rotatably mounted on the pump body, and a first crank and a second crank are provided on the crankshaft. The eccentricity of the first crank is half of the eccentricity of the second crank, and the phase angle of the first crank and the second crank is 180 degrees apart. The first crank is used to drive the half-stroke plunger movement, and the second crank is used to drive the full-stroke plunger movement.

[0011] The phase angles of the first crank and the second crank are 180 degrees apart, so the inlet and outlet states of the half-stroke chamber and the full-stroke pump chamber are completely opposite, that is, when the full-stroke chamber is in the inlet state, the half-stroke chamber is in the discharge state, and when the full-stroke chamber is in the discharge state, the half-stroke chamber is in the inlet state. In this way, the peak flow phases of the full-stroke chamber and the half-stroke chamber are 180 degrees to each other, and the pulsation is greatly reduced after superposition, and the flow is stable; at the same time, because the half-stroke plunger pump head sucks the high-pressure fluid supplied by the full-stroke plunger pump head for discharge, the half-stroke plunger generates a reverse thrust on the crankshaft when the half-stroke chamber is inlet, which helps the full-stroke plunger pump head discharge process, and this process can greatly reduce energy consumption.

[0012] To summarize, in this solution, the flow peak phases of the full-stroke chamber and the half-stroke chamber are set at 180 degrees to each other, and the pulsation is greatly reduced after superposition, and the flow is stable; and during the liquid suction process of the half-stroke chamber, the half-stroke plunger will generate a reverse thrust on the crankshaft, which assists the full-stroke plunger pump head in the discharge process and reduces energy consumption.

[0013] Optionally, it also includes a connecting rod, wherein the first crank drives the half-stroke plunger movement through the connecting rod, and the second crank drives the full-stroke plunger movement through the connecting rod.

[0014] Because the rotation of the crankshaft is a rotational motion, and the motion of the full-stroke plunger and the half-stroke plunger are both linear motions, a connecting rod is provided to realize the linkage between the crankshaft and the full-stroke plunger and the half-stroke plunger through the action of the connecting rod. Specifically, both ends of the connecting rod are hingedly connected to the crankshaft and the full-stroke plunger.

[0015] Optionally, it also includes a liquid guiding tube and a joint, wherein the liquid guiding tube and the joint are connected to the full-stroke cavity and the half-stroke cavity, and a second one-way valve is connected to the joint or the liquid guiding tube.

[0016] Optionally, it further includes a drain pipe, the first one-way valve is connected to the third one-way valve through the drain pipe, and a drain interface is provided on the drain pipe.

[0017] Optionally, a plunger stuffing box is further included. The plunger stuffing box is provided on the full-stroke cavity and the half-stroke cavity, and the full-stroke plunger and the half-stroke plunger are slidably matched with the plunger stuffing box.

[0018] Optionally, a variable frequency motor is also included, and the variable frequency motor drives the crankshaft to rotate through a worm gear.

[0019] The function of the variable frequency motor and worm gear is to stably drive the crankshaft to rotate and minimize energy consumption.

[0020] Optionally, a full-stroke pump head and a half-stroke pump head are provided on the pump body, the half-stroke cavity is provided in the half-stroke pump head, and the full-stroke cavity is provided in the full-stroke pump head.

[0021] Optionally, a liquid inlet interface is provided on the liquid inlet valve.

[0022] Optionally, the full-stroke chamber includes a first through hole and a second through hole, and the first through hole is connected to the second through hole; the half-stroke chamber includes a first through hole and a second through hole, and the first through hole is connected to the second through hole.

[0023] Both the full-stroke cavity and the half-stroke cavity adopt the design of the first through hole and the second through hole. One reason is to facilitate the rapid installation of the first drain valve, the second drain valve, the third drain valve, the full-stroke plunger and the half-stroke plunger; the other is to ensure that the liquid can flow stably.

[0024] The beneficial effects of the present invention are: by making the flow peak phases of the full-stroke chamber and the half-stroke chamber 180 degrees to each other, the pulsation is greatly reduced after superposition, and the flow is stable; and during the liquid suction process of the half-stroke chamber, the half-stroke plunger will generate a reverse thrust on the crankshaft, which assists the full-stroke plunger pump head in the liquid discharge process and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a horizontal flow metering pump.

[0026] Figure 2 yes Figure 1 AA section diagram.

[0027] Figure 3 yes Figure 1 The schematic diagram of the BB section is shown in the figure.

[0028] Figure 4 It is a schematic diagram showing the working principle of a horizontal flow metering pump.

[0029] The reference numerals in the figure are: 1, crankshaft, 2, connecting rod, 3, half-stroke plunger, 4, half-stroke pump head, 501, first one-way valve, 502, second one-way valve, 503, third one-way valve, 6, discharge interface, 7, full-stroke pump head, 8, liquid inlet valve, 9, liquid inlet interface, 10, plunger stuffing box, 11, full-stroke plunger, 1201 first crank, 1202 second crank, 13, first through hole, 14, second through hole, 15, joint, 1601, liquid guide tube, 1602, discharge tube, 17, worm gear, 18, worm, 19, variable frequency motor, 20, half-stroke cavity, 21, full-stroke cavity. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the accompanying drawings.

[0031] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a horizontal flow metering pump comprises a pump body, a crankshaft 1, a half-stroke plunger 3 and a full-stroke plunger 11;

[0032] The pump body is provided with a half-stroke cavity and a full-stroke cavity, the half-stroke plunger 3 and the full-stroke plunger 11 are both slidably mounted on the pump body, one end of the half-stroke plunger 3 is located in the half-stroke cavity, and the full-stroke plunger 11 is located in the full-stroke cavity;

[0033] A first one-way valve 501 is provided on the half-stroke chamber 20, a second one-way valve 502 is provided between the full-stroke chamber 21 and the half-stroke chamber 20, a third one-way valve 503 and a liquid inlet valve 8 are provided on the full-stroke chamber 21, the first one-way valve 501 is used to control the one-way outflow of liquid from the half-stroke chamber 20, the second one-way valve 502 is used to control the one-way flow of liquid from the full-stroke chamber 21 into the half-stroke chamber 20, the third one-way valve 503 is used to control the one-way outflow of liquid from the full-stroke chamber 21, and the liquid inlet valve 8 is used to control the one-way flow of liquid into the full-stroke chamber 21;

[0034] The crankshaft 1 is rotatably mounted on the pump body. A first crank 1201 and a second crank 1202 are provided on the crankshaft 1. The eccentricity of the first crank 1201 is half of the eccentricity of the second crank 1202. The phase angles of the first crank 1201 and the second crank 1202 are 180 degrees apart. The first crank 1201 is used to drive the half-stroke plunger 3 to move, and the second crank 1202 is used to drive the full-stroke plunger 11 to move.

[0035] The phase angles of the first crank 1201 and the second crank 1202 are 180 degrees apart, so the liquid inlet and outlet states of the half-stroke chamber 20 and the full-stroke pump chamber are completely opposite, that is, when the full-stroke chamber 21 is in the liquid inlet state, the half-stroke chamber 20 is in the liquid discharge state, and when the full-stroke chamber 21 is in the liquid discharge state, the half-stroke chamber 20 is in the liquid inlet state. In this way, the peak flow phases of the full-stroke chamber 21 and the half-stroke chamber 20 are 180 degrees to each other, and the pulsation is greatly reduced after superposition, and the flow is stable; at the same time, because the half-stroke plunger 3 pump head suction liquid is the high-pressure fluid supplied by the full-stroke plunger 11 pump head discharge liquid, the half-stroke plunger 3 generates a reverse thrust on the crankshaft 1 when the half-stroke chamber 20 is in the liquid inlet, which assists the full-stroke plunger 11 pump head discharge process, and this process can greatly reduce energy consumption.

[0036] In summary, in this solution, the flow peak phases of the full-stroke chamber 21 and the half-stroke chamber 20 are set to 180 degrees from each other, and the pulsation is greatly reduced after superposition, and the flow is stable; and during the liquid suction process of the half-stroke chamber 20, the half-stroke plunger 3 will generate a reverse thrust on the crankshaft 1, which assists the full-stroke plunger 11 pump head in the liquid discharge process, reduces energy consumption, and can save 25% of energy consumption.

[0037] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a connecting rod 2, the first crank 1201 drives the half-stroke plunger 3 to move through the connecting rod 2, and the second crank 1202 drives the full-stroke plunger 11 to move through the connecting rod 2.

[0038] Because the rotation of the crankshaft 1 is a rotational motion, and the movements of the full-stroke plunger 11 and the half-stroke plunger 3 are both linear motions, a connecting rod 2 is provided to realize the linkage between the crankshaft 1 and the full-stroke plunger 11 and the half-stroke plunger 3 through the action of the connecting rod 2. Specifically, both ends of the connecting rod 2 are hingedly connected to the crankshaft 1 and the full-stroke plunger 11.

[0039] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a liquid guiding tube 1601 and a connector 15 , which connect the full-stroke chamber 21 and the half-stroke chamber 20 , and the second one-way valve 502 is connected to the connector 15 or the liquid guiding tube 1601 .

[0040] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a discharge pipe 1602 , the first one-way valve and the third one-way valve are connected through the discharge pipe 1602 , and a discharge interface 6 is provided on the discharge pipe 1602 .

[0041] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a plunger stuffing box 10. The full-stroke cavity 21 and the half-stroke cavity 20 are both provided with plunger stuffing boxes 10. The full-stroke plunger 11 and the half-stroke plunger 3 are both slidably matched with the plunger stuffing box 10.

[0042] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, it also includes a variable frequency motor 19, which drives the crankshaft 1 to rotate through the worm gear 17 and the worm 18.

[0043] The functions of the variable frequency motor 19 and the worm gear 17 and worm 18 are to stably drive the crankshaft 1 to rotate and to minimize energy consumption.

[0044] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a full-stroke pump head 7 and a half-stroke pump head 4 are provided on the pump body, the half-stroke chamber 20 is provided in the half-stroke pump head 4 , and the full-stroke chamber 21 is provided in the full-stroke pump head 7 .

[0045] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, a liquid inlet interface 9 is provided on the liquid inlet valve 8 .

[0046] As attached Figure 1 , Attachment Figure 2 And attached Figure 3 As shown, the full-stroke chamber 21 includes a first through hole 13 and a second through hole 14, and the first through hole 13 is connected to the second through hole 14; the half-stroke chamber 20 includes a first through hole 13 and a second through hole 14, and the first through hole 13 is connected to the second through hole 14. The first through hole 13 and the second through hole 14 are perpendicular to each other.

[0047] The full-stroke chamber 21 and the half-stroke chamber 20 both adopt the design of the first through hole 13 and the second through hole 14. One reason is to facilitate the rapid installation of the first drain valve, the second drain valve, the third drain valve, the full-stroke plunger 11 and the half-stroke plunger 3; the other reason is to ensure that the liquid can flow stably.

[0048] Combined with Figure 4 , the working process of the present advection metering pump is further described, when the full stroke plunger 11 moves downward (with the attached Figure 4 ), the volume of the full-stroke cavity 21 increases, generating negative pressure. At this time, the second one-way valve 502 and the third one-way valve 503 are closed, the liquid inlet one-way valve 8 is opened, and the liquid enters the full-stroke cavity 21. At this time, the half-stroke pump head 4 is in the process of discharging liquid. When the full-stroke plunger 11 runs to the rear dead point, the liquid suction process is completed.

[0049] Discharge process of horizontal flow metering pump:

[0050] When the full-stroke plunger 11 moves forward, the volume of the full-stroke chamber 21 decreases, generating positive pressure. At this time, the liquid inlet check valve 8 is closed, and the third check valve 503 is opened. Half of the liquid is discharged through the third check valve 503, and the other half of the liquid is discharged through the second check valve 502 and enters the half-stroke chamber 20. At this time, the half-stroke pump head 4 is in the process of absorbing liquid. When the full-stroke plunger 11 runs to the front dead point, the liquid discharge process is completed;

[0051] The phase difference between the half-stroke pump body 4 and the full-stroke pump head body 7 is 180°, that is, when the full-stroke pump head body 7 is in the process of sucking liquid, the half-stroke pump body 4 is in the process of discharging liquid, and when the full-stroke pump head body 7 is in the process of discharging liquid, the half-stroke pump body 4 is in the process of sucking liquid. The flow rates are mutually adjusted and supplemented, which smoothes the pulsation. Figure 4 The black arrow in the middle indicates the flow direction of the liquid.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A horizontal flow metering pump, characterized in that: Including pump body, crankshaft, half-stroke plunger and full-stroke plunger; The pump body is provided with a half-stroke cavity and a full-stroke cavity, the half-stroke plunger and the full-stroke plunger are both slidably mounted on the pump body, one end of the half-stroke plunger is located in the half-stroke cavity, and the full-stroke plunger is located in the full-stroke cavity; A first one-way valve is arranged on the half-stroke chamber, a second one-way valve is arranged between the full-stroke chamber and the half-stroke chamber, a third one-way valve and a liquid inlet valve are arranged on the full-stroke chamber, the first one-way valve is used to control the one-way outflow of liquid from the half-stroke chamber, the second one-way valve is used to control the one-way flow of liquid from the full-stroke chamber into the half-stroke chamber, the third one-way valve is used to control the one-way outflow of liquid from the full-stroke chamber, and the liquid inlet valve is used to control the one-way flow of liquid into the full-stroke chamber; The crankshaft is rotatably mounted on the pump body, and a first crank and a second crank are provided on the crankshaft. The eccentricity of the first crank is half of the eccentricity of the second crank, and the phase angle of the first crank and the second crank is 180 degrees apart. The first crank is used to drive the half-stroke plunger movement, and the second crank is used to drive the full-stroke plunger movement. It also includes a liquid guiding tube and a joint, wherein the liquid guiding tube and the joint are connected to the full-stroke cavity and the half-stroke cavity, and a second one-way valve is connected to the joint or the liquid guiding tube; It also includes a liquid discharge pipe, through which the first one-way valve and the third one-way valve are connected, and a liquid discharge interface is provided on the liquid discharge pipe; The full-stroke chamber includes a first through hole and a second through hole, and the first through hole is connected to the second through hole; the half-stroke chamber includes a first through hole and a second through hole, and the first through hole is connected to the second through hole.

2. The horizontal flow metering pump according to claim 1, characterized in that: It also includes a connecting rod, wherein the first crank drives the half-stroke plunger to move through the connecting rod, and the second crank drives the full-stroke plunger to move through the connecting rod.

3. The horizontal flow metering pump according to claim 1, characterized in that: It also includes a plunger stuffing box, which is provided on the full-stroke cavity and the half-stroke cavity, and the full-stroke plunger and the half-stroke plunger are slidably matched with the plunger stuffing box.

4. The horizontal flow metering pump according to claim 1, characterized in that: It also includes a variable frequency motor, which drives the crankshaft to rotate through a worm gear.

5. The horizontal flow metering pump according to claim 1, characterized in that: The pump body is provided with a full-stroke pump head and a half-stroke pump head, the half-stroke cavity is arranged in the half-stroke pump head, and the full-stroke cavity is arranged in the full-stroke pump head.

6. The horizontal flow metering pump according to claim 1, characterized in that: The liquid inlet valve is provided with a liquid inlet interface.

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