Preparation type high-pressure three-pump-head plunger pump special for liquid phase

Abstract

The utility model provides a preparation type high-pressure plunger pump with three pump heads special for a liquid phase, and relates to the field of preparation type high-pressure plunger pumps special for the liquid phase, the preparation type high-pressure plunger pump comprises a delivery pump assembly and a driving assembly, the delivery pump assembly comprises a plunger, a sliding block, a first bearing, a connecting rod, a second bearing, a large shaft, a pump body, pump heads, a liquid inlet assembly and a liquid outlet assembly, the driving assembly comprises belt wheels, a belt and a motor, the number of the belt wheels is four, and every two belt wheels form a group; the motor drives the driving assembly composed of the belt wheel and the belt to drive the large shaft to move, the large shaft moves to drive one end of the connecting rod to conduct circular motion, the other end of the connecting rod is connected with the sliding block, the sliding block conducts reciprocating motion, the plunger is driven to conduct reciprocating motion when the sliding block conducts reciprocating motion, and therefore suction force is generated, and liquid suction and liquid outlet functions are achieved. Through a three-plunger form, the common problems of large pressure pulsation, low flow accuracy and poor flow repeatability of a high-pressure infusion pump in the liquid chromatogram preparation process are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of liquid phase special preparation type high pressure plunger pump, specifically liquid phase special preparation type high pressure three pump head plunger pump. BACKGROUND

[0002] The purpose of liquid phase preparation is to extract and purify monomers of products, compared with traditional purification methods (such as distillation, extraction), preparation liquid phase is a more effective separation method, so it is widely used in extraction and purification of sample and product, the basic principle of liquid chromatography preparation is based on the difference of distribution coefficient of each component in mixture between stationary phase and mobile phase, liquid chromatography preparation passes through high pressure infusion pump with high speed to flow phase, and realizes separation by using adsorption, distribution and other effects of each component on stationary phase;

[0003] At present, high pressure infusion pump in liquid chromatography preparation commonly uses piston reciprocating type high pressure infusion pump, and the high pressure infusion pump is one of key components of liquid chromatograph, is the device for conveying mobile phase to chromatographic column under the condition of higher pressure and stable flow rate, so that samples are analyzed one by one, and the performance directly influences the reliability of the whole instrument and analysis result;

[0004] The piston reciprocating type high pressure infusion pump of some manufacturers on the market commonly adopts double plunger form, drives the slider through eccentric wheel, drives the plunger through the slider, utilizes the cooperation of high pressure sealing ring and plunger, controls the one-way flow of liquid through one-way valve, and periodically operates the transmission structure for resetting to make the high pressure infusion pump convey liquid, and this structure can appear many problems in actual production and use, for example, metal spring can appear metal fatigue phenomenon after long time operation, which can lead to poor output flow precision of high pressure infusion pump and unstable output pressure, and the double pump head infusion pump can also appear running dead point in structure, and two eccentric wheels can appear a work state of not doing work in a running cycle, therefore, the high pressure infusion pump with double pump head spring form has poor application effect in actual production and use process, and cannot meet the production process and requirement of high flow precision, small pressure pulsation and good flow repeatability.

[0005] Therefore, the utility model provides liquid phase special preparation type high pressure three pump head plunger pump to solve the above problems. Utility model content

[0006] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0007] The utility model relates to a liquid phase special preparation high pressure three pump head plunger pump, including conveying pump subassembly and drive subassembly, the conveying pump subassembly includes plunger, slider, first bearing, connecting rod, second bearing, axle, pump body, pump head, liquid inlet subassembly and liquid outlet subassembly, the drive subassembly includes pulley, belt and motor, the number of pulley sets four, and every two is a group, the number of belt sets two, and is respectively set up in the surface of two groups pulley, the rear end of pump body is set up with the installation cavity, the slider, connecting rod and axle all install in the inner chamber of installation cavity, the slider installs in the inner chamber of pump body, and with the inner chamber of pump body sliding connection, the plunger installs in the front end of slider, the plunger, slider and connecting rod set up three groups, and three connecting rod all install in the surface of axle.

[0008] Further, in the utility model, the slider and the connecting rod are movably connected through the first bearing, the connecting rod and the axle are movably connected through the second bearing, and the slider and the inner wall of the pump body are slidably connected through the linear bearing.

[0009] Further, in the utility model, the output shaft of the motor is in transmission connection with the pulley, the pulley is in transmission connection with the axle, and the motor is fixed to the rear end of the pump body.

[0010] Further, in the utility model, one end of the plunger away from the slider extends to the inner chamber of the pump head, and the one end of the plunger away from the slider is also provided with a high-pressure sealing ring and a guide ring, the high-pressure sealing ring is used for providing sealing, and the guide ring is used for limiting.

[0011] Further, in the utility model, the liquid inlet subassembly and the liquid outlet subassembly are respectively installed at the lower end and the upper end of the pump head and are in communication with the inner chamber of the pump head, and the upper and lower ends of the pump head are both provided with a one-way valve.

[0012] Further, in the utility model, the bottom of the pump body is provided with a buffer pad, the buffer pad is used for shock absorption, the pump head is installed at the front end of the pump body and is in communication with the inner chamber of the pump body.

[0013] Beneficial effects, the utility model has following beneficial effects:

[0014] The utility model discloses a drive assembly and conveying pump assembly are set up, have played the effect of the stable liquid conveying, the drive assembly that motor drive pulley and belt constitute drive big axle movement, and one end of connecting rod does circular motion under the drive of big axle movement, and the other end of connecting rod is connected to the slider, makes the slider reciprocating motion, and the reciprocating motion of slider drives the reciprocating motion of plunger, thereby generates suction, realizes the function of liquid absorption and liquid outlet, and the one -way flow of check valve is carried out the conveying of liquid, and check valve can prevent liquid from flowing or refluxing in the conveying process, through three plunger form, thereby solve the problem that the pressure pulsation of high pressure infusion pump is big, and the flow precision is low, and the flow repeatability is poor in the process of liquid chromatography preparation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the front view structure schematic diagram of the utility model;

[0016] Figure 2 It is the side view sectional structure schematic diagram of the utility model;

[0017] Figure 3 It is the utility model Figure 2 A place partial close -up structure schematic diagram of the utility model.

[0018] In the drawing:

[0019] 1, plunger;2, high pressure seal ring;3, slider;4, first bearing;5, connecting rod;6, second bearing;7, big axle;8, pump body;9, pulley;10, belt;11, motor;12, buffer pad;13, guide ring;14, installation cavity;15, pump head;16, liquid inlet assembly;17, liquid outlet assembly. DETAILED DESCRIPTION

[0020] In order to more understand the technical content of the utility model, specific embodiment is raised and the following is described with the accompanying drawings.The aspects of the utility model are described in the disclosure with reference to the drawings, and many embodiments of the description are shown in the drawings.The embodiments of the disclosure are not necessarily defined in all aspects including the utility model.It should be understood that the above various concepts and embodiments, and those concepts and implementation modes described in more detail below can be implemented in any one of many ways, because the concepts and embodiments disclosed by the utility model are not limited to any implementation mode.In addition, some aspects of the utility model can be used alone, or used in any appropriate combination with other aspects of the utility model.

[0021] Embodiment 1

[0022] As Figures 1-3As shown, the first embodiment of the utility model provides the preparation type high pressure three pump head plunger pump special for liquid phase, including conveying pump assembly and drive assembly, conveying pump assembly includes plunger 1, sliding block 3, first bearing 4, connecting rod 5, second bearing 6, large shaft 7, pump body 8, pump head 15, liquid inlet assembly 16 and liquid outlet assembly 17, drive assembly includes pulley 9, belt 10 and motor 11, the number of pulley 9 is provided with four, and every two is a group, the number of belt 10 is provided with two, and is respectively set in the surface of two groups of pulley 9, the rear end of pump body 8 is provided with installation cavity 14, sliding block 3, connecting rod 5 and large shaft 7 are all installed in the inner chamber of installation cavity 14, sliding block 3 is installed in the inner chamber of pump body 8, and is connected with the inner chamber of pump body 8 slidingly, plunger 1 is installed at the front end of sliding block 3, plunger 1, sliding block 3 and connecting rod 5 are provided with three groups, and three connecting rods 5 are all installed on the surface of large shaft 7.

[0023] As Figures 1-3 As shown, the drive assembly formed by motor 11, pulley 9 and belt 10 drives large shaft 7 to move, one end of connecting rod 5 makes circular motion driven by the movement of large shaft 7, the other end of connecting rod 5 is connected with sliding block 3, so that sliding block 3 reciprocates, and plunger 1 reciprocates when sliding block 3 reciprocates, thereby generating suction, realizing liquid suction and liquid outlet function, and realizing liquid one-way flow through the one-way valve equipped in liquid inlet assembly 16 and liquid outlet assembly 17, through three plunger forms, thereby solving the problems of large pressure pulsation, low flow precision and poor flow repeatability of high-pressure infusion pump in the process of liquid chromatography preparation, the transmission structure adopts hard connection mode, large shaft 7, first bearing 4, second bearing 6, connecting rod 5 and sliding block 3 are connected with each other, compared with common spring transmission structure in the running process, the transmission structure has the advantages of smaller movable gap, more stable and more accurate plunger 1 in the reciprocating process, compared with the direct contact transmission structure of eccentric wheel, has the characteristics of small friction resistance, long maintenance period, stable operation and long service life.

[0024] Embodiment 2

[0025] Referring to Figures 1-3 , the second embodiment of the utility model, the embodiment is based on the previous embodiment.

[0026] In the embodiment, sliding block 3 and connecting rod 5 are movably connected through first bearing 4, connecting rod 5 and large shaft 7 are movably connected through second bearing 6, and sliding block 3 and the inner wall of pump body 8 are slidably connected through linear bearing.

[0027] The output shaft of motor 11 is in transmission connection with pulley 9, pulley 9 is in transmission connection with large shaft 7, and motor 11 is fixed to the rear end of pump body 8.

[0028] The end of the plunger 1 away from the slider 3 extends to the inner cavity of the pump head 15, and the end of the plunger 1 away from the slider 3 is also provided with a high-pressure sealing ring 2 and a guide ring 13, the high-pressure sealing ring 2 is used to provide sealing, and the guide ring 13 is used for limiting.

[0029] The liquid inlet assembly 16 and the liquid outlet assembly 17 are respectively installed at the lower end and the upper end of the pump head 15, and are in communication with the inner cavity of the pump head 15, and the upper and lower ends of the pump head 15 are provided with a one-way valve.

[0030] The bottom of the pump body 8 is provided with a buffer pad 12 for shock absorption, and the pump head 15 is installed at the front end of the pump body 8 and is in communication with the inner cavity of the pump body 8.

[0031] As shown in Figures 1-3 The second bearing 6 can be a cylindrical roller bearing, and the first bearing 4 can be a needle bearing, which is supported and mechanically rotated by the bearing. The selection of the bearing can increase lubrication and reduce the friction coefficient during movement to ensure good transmission efficiency and service life. The high-pressure sealing ring 2 cooperates to realize sealing. The plunger 1 reciprocates in the cavity to change the volume of the sealed working cavity to realize liquid suction and liquid outlet functions. The plunger 1, the high-pressure sealing ring 2, and the high-pressure sealing ring groove processed at the pump head perfectly cooperate to realize a process flow pressure of 10 MPa, and the maximum can reach 35 MPa. The guide ring 13 structure of the pump head 15 can make the plunger 1 and the high-pressure sealing ring 2 have good concentricity, so that the high-pressure sealing ring 2 is uniformly stressed and not biased during the reciprocating operation of the plunger 1, so that the high-pressure sealing ring 2 is in the best working state to ensure the stability of the output flow and pressure, prolong the service life and reduce the cost. The three-plunger driving mode makes the structure design more reasonable, and the three plungers 1 work alternately to reduce the amount of work of each sealing structure. Under the same flow conditions, compared with the common double-pump head high-pressure infusion pump on the market, this structure reduces the wear of the high-pressure sealing ring 2. The large shaft 7 is an integrated crankshaft structure, the material of the large shaft 7 is 45# steel and is subjected to metal conditioning treatment and surface blackening treatment, which enhances the strength of the transmission structure and increases the corrosion resistance. The three-equal crankshaft structure makes the large shaft 7 more balanced, and the plunger 1 realizes stable output of the transported liquid during periodic reciprocating motion. The pump head 15 structure adopts modular design, and the output flow can be switched by replacing different forms of plunger mechanism. The modular structure is simpler, more flexible, more efficient, more convenient, and lower in cost for actual production and use. The contact liquid material of the pump head 15 can be customized, and the application range is wider, the adaptability is stronger, and the matching degree is higher.

[0032] In use, the driving assembly composed of the belt wheel 9 and the belt 10 is driven by the motor 11 to drive the large shaft 7 to move, the large shaft 7 drives one end of the connecting rod 5 to move in a circle when moving, the other end of the connecting rod 5 is connected with the sliding block 3, so that the sliding block 3 moves back and forth, the sliding block 3 drives the plunger 1 to move back and forth when moving back and forth, so that suction is generated, the liquid suction and liquid discharge functions are realized, the one-way valves equipped in the liquid inlet assembly 16 and the liquid outlet assembly 17 are used to realize the one-way flow of the liquid, the three-plunger form is used, so that the problems of large pressure pulsation, low flow precision and poor flow repeatability of the high-pressure infusion pump commonly seen in the process of liquid chromatography preparation are solved.

[0033] The standard parts used in the present application can be purchased from the market, and can be ordered according to the description and drawings, and the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt the conventional types in the prior art, the control mode is automatically controlled through a controller, the control circuit of the controller can be realized by simple programming of the person skilled in the art, which belongs to the common knowledge in the art, and the present application is mainly used to protect the mechanical device, so the control mode and circuit connection will not be explained in detail.

[0034] Although the present application has been disclosed with the above preferred embodiments, it is not intended to limit the present application. Those skilled in the art can make various modifications and decorations without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the definition of the claims.

Claims

1. A high-pressure three-pump head plunger pump for liquid phase preparation, comprising a delivery pump assembly and a drive assembly, characterized in that: The delivery pump assembly includes a plunger (1), a slider (3), a first bearing (4), a connecting rod (5), a second bearing (6), a main shaft (7), a pump body (8), a pump head (15), an inlet assembly (16), and an outlet assembly (17). The drive assembly includes pulleys (9), a belt (10), and a motor (11). There are four pulleys (9), arranged in pairs. There are two belts (10), each fitted onto one of the two sets of pulleys. On the surface of 9), the rear end of the pump body (8) is provided with an installation cavity (14). The slider (3), connecting rod (5) and the main shaft (7) are all installed in the inner cavity of the installation cavity (14). The slider (3) is installed in the inner cavity of the pump body (8) and is slidably connected to the inner cavity of the pump body (8). The plunger (1) is installed at the front end of the slider (3). There are three sets of plunger (1), slider (3) and connecting rod (5), and all three connecting rods (5) are installed on the surface of the main shaft (7).

2. The liquid-phase preparation-specific high-pressure three-pump head plunger pump as described in claim 1, characterized in that: The slider (3) and the connecting rod (5) are movably connected by the first bearing (4), the connecting rod (5) and the main shaft (7) are movably connected by the second bearing (6), and the slider (3) and the inner wall of the pump body (8) are slidably connected by the linear bearing.

3. The liquid-phase preparation-specific high-pressure three-pump head plunger pump as described in claim 1, characterized in that: The output shaft of the motor (11) is connected to the pulley (9) for transmission, the pulley (9) is connected to the shaft (7) for transmission, and the motor (11) is fixed to the rear end of the pump body (8).

4. The liquid-phase preparation-specific high-pressure three-pump head plunger pump as described in claim 1, characterized in that: The plunger (1) extends into the inner cavity of the pump head (15) at the end away from the slider (3). A high-pressure sealing ring (2) and a guide ring (13) are also installed at the end of the plunger (1) away from the slider (3). The high-pressure sealing ring (2) is used to provide a seal, and the guide ring (13) is used to limit movement.

5. The liquid-phase preparation-specific high-pressure three-pump head plunger pump as described in claim 1, characterized in that: The liquid inlet assembly (16) and liquid outlet assembly (17) are respectively installed at the lower end and upper end of the pump head (15), and both are connected to the inner cavity of the pump head (15). One-way valves are installed at both the upper and lower ends of the pump head (15).

6. The liquid-phase preparation-specific high-pressure three-pump head plunger pump as described in claim 1, characterized in that: A buffer pad (12) is installed at the bottom of the pump body (8). The buffer pad (12) is used for shock absorption and buffering. The pump head (15) is installed at the front end of the pump body (8) and communicates with the inner cavity of the pump body (8).

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