Double-head plunger metering pump

Abstract

The utility model discloses a double-head plunger metering pump, which relates to the technical field of metering pumps and comprises a shell, a motor, a crankshaft, a left plunger and a right plunger, a left pump head and a right pump head are respectively arranged on the left side and the right side of the shell, a left liquid inlet and a left liquid outlet are respectively arranged at two ends of the left pump head, and a right liquid inlet and a right liquid outlet are respectively arranged at two ends of the right pump head. The left plunger and the right plunger are respectively arranged in the left pump head and the right pump head in a sliding manner; the crankshaft is rotationally installed in the shell, a left driving flywheel and a right driving flywheel are installed on the crankshaft, the left end of the left driving flywheel is connected with the left plunger through a left push rod, the right end of the right driving flywheel is connected with the right plunger through a right push rod, an output shaft of the motor is connected with the crankshaft, and the motor can drive the crankshaft to rotate. The left plunger and the right plunger are driven to move left and right in a reciprocating mode. The flow pulsation can be reduced, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of metering pumps, in particular to a double-head plunger metering pump. Background Art

[0002] A metering pump is a fluid conveying machine that can maintain a constant flow rate regardless of the discharge pressure. The metering pump can simultaneously complete the functions of conveying, metering and regulating, thereby simplifying the production process. Today, metering pumps have been widely used in various industrial fields such as petrochemicals, pharmaceuticals, and food.

[0003] Metering pumps can be divided into plunger type and diaphragm type metering pumps according to the structure of the flow passage part; among them, when the plunger pump is working, the motor drives the worm through the coupling and the worm gear speed reducer to make the main shaft and the eccentric wheel rotate, and the eccentric wheel drives the bow-shaped connecting rod to drive the plunger to reciprocate; when the plunger moves to the rear dead point, a vacuum is gradually formed in the pump chamber, the suction valve opens, and the liquid is sucked in; when the plunger moves to the front dead point, the suction valve is closed, the discharge valve opens, and the liquid is discharged when the plunger moves further; the reciprocating cycle of the pump forms a continuous pressurized and quantitative discharge of liquid. The flow of a single-pump structure metering pump is pulsating, which will cause flow errors; while the flow pulsation of a multi-pump structure plunger metering pump is small, but the structure will be more complicated. Utility Model Content

[0004] The utility model aims to provide a double-head plunger metering pump to solve the problems existing in the prior art, which can reduce the pulsation of flow and has a simple structure.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a double-head plunger metering pump, comprising a housing, a motor, a crankshaft, a left plunger and a right plunger, wherein a left pump head and a right pump head are respectively arranged on the left and right sides of the housing, two ends of the left pump head are respectively arranged with a left liquid inlet and a left liquid outlet, two ends of the right pump head are respectively arranged with a right liquid inlet and a right liquid outlet, the left plunger and the right plunger are respectively slidably arranged in the left pump head and the right pump head; the crankshaft is rotatably installed in the housing, and a left driving flywheel and a right driving flywheel are installed on the crankshaft, the left end of the left driving flywheel is connected to the left plunger through a left push rod, the right end of the right driving flywheel is connected to the right plunger through a right push rod, the output shaft of the motor is connected to the crankshaft, and the motor can drive the crankshaft to rotate, so as to drive the left plunger and the right plunger to move back and forth left and right.

[0007] Preferably, the motor is a servo motor, and the output shaft of the servo motor is connected to a reducer.

[0008] Preferably, the crankshaft comprises an upper shaft, a lower shaft and an intermediate shaft, the upper shaft is rotatably connected to the housing via an upper crankshaft bearing, the lower shaft is rotatably connected to the housing via a lower crankshaft bearing, and the upper shaft and the lower shaft are concentrically arranged;

[0009] Wherein, the bottom of the upper shaft and the top of the lower shaft are both horizontally provided with connecting parts, the intermediate shaft is connected to the same end of the two connecting parts, and the intermediate shaft is parallel to the upper shaft and the lower shaft and is eccentrically arranged.

[0010] Preferably, the intermediate shaft is detachably connected to the upper shaft and the lower shaft via crankshaft fixing screws, and the crankshaft upper bearing and the crankshaft lower bearing are both ceramic bearings.

[0011] Preferably, a left end cover is installed on the left side of the housing, the left pump head is installed on the left end cover, a left plunger sleeve is arranged inside the left end cover, and the left plunger is slidably installed in the left plunger sleeve;

[0012] A right end cover is installed on the right side of the shell, the right pump head is installed on the right end cover, a right plunger sleeve is arranged inside the right end cover, and the right plunger is slidably installed in the right plunger sleeve.

[0013] Preferably, the left end cover is mounted on the left side of the housing by fixing screws, the left pump head is mounted on the left end cover by fixing screws, and sealing rings are provided between the left pump head and the left end cover, and between the left end cover and the housing;

[0014] The right end cover is mounted on the right side of the housing by fixing screws, the right pump head is mounted on the right end cover by fixing screws, and sealing rings are provided between the right pump head and the right end cover, and between the right end cover and the housing.

[0015] Preferably, the left push rod and the right push rod both include a push rod body and a push rod head, one end of the push rod body is rotatably connected to the left drive flywheel or the right drive flywheel, and the other end is provided with the push rod head, which is a spherical body and is used to form a ball joint with the left plunger or the right plunger.

[0016] Preferably, the left plunger and the right plunger each include a piston head and a push rod cover, a spherical cavity is formed between the piston head and the push rod cover, the push rod head is rotatably installed in the spherical cavity, and a piston ring is arranged on the outer side of the piston head;

[0017] Wherein, the piston head and the push rod cover are detachably connected via a plunger fixing screw, and the piston head is a ceramic piston.

[0018] Preferably, the left driving flywheel and the right driving flywheel both comprise a driving flywheel upper portion and a driving flywheel lower portion, the driving flywheel upper portion and the driving flywheel lower portion are buckled and detachably connected via flywheel fixing screws;

[0019] The middle parts of the left drive flywheel and the right drive flywheel are rotatably mounted on the crankshaft through flywheel bearings, and push rod mounting holes are provided on the left drive flywheel and the right drive flywheel for connecting the left push rod or the right push rod.

[0020] Preferably, the flywheel bearing is a ceramic bearing.

[0021] Compared with the prior art, the utility model has achieved the following technical effects:

[0022] The left pump head and the right pump head are respectively arranged on the left and right sides of the shell of the utility model, and a double-head (double pump) structure is adopted to effectively reduce flow pulsation; moreover, a left drive flywheel and a right drive flywheel are installed on the crankshaft, the left end of the left drive flywheel is connected with the left plunger through a left push rod, and the right end of the right drive flywheel is connected with the right plunger through a right push rod. The crankshaft is driven to rotate by a motor, which can drive the left plunger and the right plunger to move back and forth left and right, so that the left pump head and the right pump head can take turns to inhale and discharge liquid, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the structure of a double-headed plunger metering pump in an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of a crankshaft in an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the piston drive structure in an embodiment of the utility model.

[0027] In the figure: 1-servo motor; 2-reducer; 3-housing; 4-crankshaft; 41-upper shaft; 42-intermediate shaft; 43-lower shaft; 44-crankshaft fixing screw; 5-crankshaft upper bearing; 6-crankshaft lower bearing; 7-left plunger; 71-piston head; 72-push rod cover; 73-piston ring; 74-plunger fixing screw; 8-left plunger sleeve; 9-left drive flywheel; 91-drive flywheel upper part; 92-drive flywheel lower part; 93-flywheel bearing; 94 -push rod mounting hole; 95-flywheel fixing screw; 10-left push rod; 101-push rod head; 11-left end cover; 111-first screw hole; 12-left pump head; 121-left liquid inlet; 122-left liquid outlet; 123-second screw hole; 13-right plunger; 14-right plunger sleeve; 15-right driving flywheel; 16-right push rod; 17-right end cover; 18-right pump head; 181-right liquid inlet; 182-right liquid outlet; 19-sealing ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model aims to provide a double-head plunger metering pump to solve the problems existing in the prior art, which can reduce the pulsation of flow and has a simple structure.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Embodiment 1

[0032] like Figure 1-Figure 3As shown, a double-head plunger metering pump is provided in this embodiment, which mainly includes a housing 3, a motor, a crankshaft 4, a left plunger 7 and a right plunger 13. A left pump head 12 and a right pump head 18 are respectively arranged on the left and right sides of the housing 3. The two ends of the left pump head 12 are respectively provided with a left liquid inlet 121 and a left liquid outlet 122, and the two ends of the right pump head 18 are respectively provided with a right liquid inlet 181 and a right liquid outlet 182. The left plunger 7 and the right plunger 13 are respectively slidably arranged in the left pump head 12 and the right pump head 18; the crankshaft 4 rotates The motor is dynamically installed in the housing 3, and a left drive flywheel 9 and a right drive flywheel 15 are installed on the crankshaft 4. The left end of the left drive flywheel 9 is connected to the left plunger 7 through a left push rod 10, and the right end of the right drive flywheel 15 is connected to the right plunger 13 through a right push rod 16. The output shaft of the motor is connected to the crankshaft 4. The motor can drive the crankshaft 4 to rotate, so as to drive the left plunger 7 and the right plunger 13 to move back and forth left and right, so that the left pump head 12 and the right pump head 18 can take turns to inhale and discharge liquid, and the structure is simple.

[0033] This embodiment adopts a double-head (double-pump) structure, which effectively reduces flow pulsation and has a simple structure.

[0034] In this embodiment, the motor is preferably a servo motor 1, which has a wide speed regulation range, more stable operation, and more accurate measurement; and the output shaft of the servo motor 1 is connected to a reducer 2, which drives the crankshaft 4 to rotate.

[0035] In this embodiment, the crankshaft 4 mainly includes an upper shaft 41, a lower shaft 43 and an intermediate shaft 42, the upper shaft 41 is rotatably connected to the housing 3 through an upper crankshaft bearing 5, the lower shaft 43 is rotatably connected to the housing 3 through a lower crankshaft bearing 6, and the upper shaft 41 and the lower shaft 43 are concentrically arranged;

[0036] Among them, the bottom of the upper shaft 41 and the top of the lower shaft 43 are both horizontally provided with a connecting part, which is preferably a rectangular block. The intermediate shaft 42 is connected to the same end of the two connecting parts. The intermediate shaft 42 is parallel to the upper shaft 41 and the lower shaft 43, and is eccentrically arranged.

[0037] In this embodiment, threaded inner holes are processed at the centers of both ends of the intermediate shaft 42, and the intermediate shaft 42 is detachably connected to the upper shaft 41 and the lower shaft 43 via crankshaft fixing screws 44, which is convenient for assembly and simple to process.

[0038] In this embodiment, a left end cover 11 is installed on the left side of the shell 3, the left pump head 12 is installed on the left end cover 11, a left plunger sleeve 8 is provided in the left end cover 11, and the left plunger 7 is slidably installed in the left plunger sleeve 8; a right end cover 17 is installed on the right side of the shell 3, the right pump head 18 is installed on the right end cover 17, a right plunger sleeve 14 is provided in the right end cover 17, and the right plunger 13 is slidably installed in the right plunger sleeve 14.

[0039] In this embodiment, the left end cover 11 is mounted on the left side of the housing 3 by fixing screws, the left pump head 12 is mounted on the left end cover 11 by fixing screws, and a sealing ring 19 is provided between the left pump head 12 and the left end cover 11, and between the left end cover 11 and the housing 3;

[0040] Similarly, the right end cover 17 is installed on the right side of the shell 3 by fixing screws, the right pump head 18 is installed on the right end cover 17 by fixing screws, and sealing rings 19 are provided between the right pump head 18 and the right end cover 17, and between the right end cover 17 and the shell 3.

[0041] Specifically, taking the left pump head 12 as an example, a plurality of first screw holes 111 and threaded internal threads are provided on the left end cover 11. The first screw holes 111 are screwed to fix the left end cover 11 to the housing 3. A plurality of second screw holes 123 are opened on the left pump head 12, which are connected to the threaded internal threads of the left end cover 11 by screws to fix the left pump head 12 to the left end cover 11. The installation method of the right pump head 18 is similar.

[0042] In this embodiment, the left push rod 10 and the right push rod 16 both include a push rod body and a push rod head 101. One end of the push rod body is rotatably connected to the left drive flywheel 9 or the right drive flywheel 15, and the other end is provided with the push rod head 101. The push rod head 101 is a sphere and is used to form a ball joint with the left plunger 7 or the right plunger 13.

[0043] In this embodiment, the left plunger 7 and the right plunger 13 both include a piston head 71 and a push rod cover 72, a spherical cavity is formed between the piston head 71 and the push rod cover 72, the push rod head 101 is rotatably installed in the spherical cavity, and a piston ring 73 is provided on the outer side of the piston head 71; wherein, the piston head 71 and the push rod cover 72 are detachably connected by a plunger fixing screw 74.

[0044] In this embodiment, the left driving flywheel 9 and the right driving flywheel 15 both include a driving flywheel upper portion 91 and a driving flywheel lower portion 92, and the driving flywheel upper portion 91 and the driving flywheel lower portion 92 are buckled and detachably connected by a flywheel fixing screw 95;

[0045] The middle parts of the left drive flywheel 9 and the right drive flywheel 15 are rotatably mounted on the crankshaft 4 through flywheel bearings 93, and push rod mounting holes 94 are provided on the left drive flywheel 9 and the right drive flywheel 15 for connecting the left push rod 10 or the right push rod 16.

[0046] In this embodiment, the crankshaft upper bearing 5, the crankshaft lower bearing 6, and the flywheel bearing 93 are all ceramic bearings, and the piston head 71 is a ceramic piston. Ceramics are corrosion-resistant and wear-resistant, and have the characteristics of long life and high reliability.

[0047] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A double-head plunger metering pump, characterized in that: The invention comprises a shell, a motor, a crankshaft, a left plunger and a right plunger, wherein a left pump head and a right pump head are respectively arranged on the left and right sides of the shell, two ends of the left pump head are respectively arranged with a left liquid inlet and a left liquid outlet, two ends of the right pump head are respectively arranged with a right liquid inlet and a right liquid outlet, the left plunger and the right plunger are respectively slidably arranged in the left pump head and the right pump head; the crankshaft is rotatably installed in the shell, and a left driving flywheel and a right driving flywheel are installed on the crankshaft, the left end of the left driving flywheel is connected with the left plunger through a left push rod, the right end of the right driving flywheel is connected with the right plunger through a right push rod, the output shaft of the motor is connected with the crankshaft, and the motor can drive the crankshaft to rotate, so as to drive the left plunger and the right plunger to move back and forth left and right.

2. The double-head plunger metering pump according to claim 1, characterized in that: The motor is a servo motor, and the output shaft of the servo motor is connected with a reducer.

3. The double-head plunger metering pump according to claim 1, characterized in that: The crankshaft comprises an upper shaft, a lower shaft and an intermediate shaft, the upper shaft is rotatably connected to the housing via an upper crankshaft bearing, the lower shaft is rotatably connected to the housing via a lower crankshaft bearing, and the upper shaft and the lower shaft are concentrically arranged; Wherein, the bottom of the upper shaft and the top of the lower shaft are both horizontally provided with connecting parts, the intermediate shaft is connected to the same end of the two connecting parts, and the intermediate shaft is parallel to the upper shaft and the lower shaft and is eccentrically arranged.

4. The double-head plunger metering pump according to claim 3, characterized in that: The intermediate shaft is detachably connected to the upper shaft and the lower shaft via crankshaft fixing screws, and both the crankshaft upper bearing and the crankshaft lower bearing are ceramic bearings.

5. The double-head plunger metering pump according to claim 1, characterized in that: A left end cover is installed on the left side of the housing, the left pump head is installed on the left end cover, a left plunger sleeve is arranged inside the left end cover, and the left plunger is slidably installed in the left plunger sleeve; A right end cover is installed on the right side of the shell, the right pump head is installed on the right end cover, a right plunger sleeve is arranged inside the right end cover, and the right plunger is slidably installed in the right plunger sleeve.

6. The double-head plunger metering pump according to claim 5, characterized in that: The left end cover is mounted on the left side of the housing by fixing screws, the left pump head is mounted on the left end cover by fixing screws, and sealing rings are provided between the left pump head and the left end cover, and between the left end cover and the housing; The right end cover is mounted on the right side of the housing by fixing screws, the right pump head is mounted on the right end cover by fixing screws, and sealing rings are provided between the right pump head and the right end cover, and between the right end cover and the housing.

7. The double-head plunger metering pump according to claim 1, characterized in that: The left push rod and the right push rod both include a push rod body and a push rod head. One end of the push rod body is rotationally connected to the left drive flywheel or the right drive flywheel, and the other end is provided with the push rod head. The push rod head is a spherical body and is used to form a ball joint with the left plunger or the right plunger.

8. The double-head plunger metering pump according to claim 7, characterized in that: The left plunger and the right plunger each include a piston head and a push rod cover, a spherical cavity is formed between the piston head and the push rod cover, the push rod head is rotatably installed in the spherical cavity, and a piston ring is arranged on the outer side of the piston head; Wherein, the piston head and the push rod cover are detachably connected via a plunger fixing screw, and the piston head is a ceramic piston.

9. The double-head plunger metering pump according to claim 1 or 7, characterized in that: The left driving flywheel and the right driving flywheel both include a driving flywheel upper portion and a driving flywheel lower portion, the driving flywheel upper portion and the driving flywheel lower portion are buckled and detachably connected via flywheel fixing screws; The middle parts of the left drive flywheel and the right drive flywheel are rotatably mounted on the crankshaft through flywheel bearings, and push rod mounting holes are provided on the left drive flywheel and the right drive flywheel for connecting the left push rod or the right push rod.

10. The double-head plunger metering pump according to claim 9, characterized in that: The flywheel bearing is a ceramic bearing.

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