Tandem type constant-flux pump with pulsation suppression function

Abstract

The utility model discloses a tandem type constant-flux pump with a pulsation suppression function, which comprises a shell, a servo motor is arranged in the shell, a main control board is arranged at the top end in the shell, the servo motor is electrically connected with the main control board, a regulating valve is arranged on the front side of the shell, the top of the regulating valve is communicated with an output port, and the output port is communicated with a motor. The tail end of the adjusting valve communicates with a pressure sensor, and a pump body structure is arranged in the shell. The reciprocating motion of the transmission rod and the plunger is driven by the two cams, and the two cams compensate each other in the rotating process, so that the fluctuation of liquid output pressure is reduced, the suppression effect of output pulsation can be improved, the continuity and uniformity of liquid conveying are ensured, meanwhile, the output flow of the constant-flux pump can be finely adjusted, and the production efficiency of the constant-flux pump is improved. The stability of a detection signal is improved, so that the instrument can more accurately detect and analyze low-concentration and trace component samples.

Description

Technical Field

[0001] This utility model relates to the field of advection pump technology, and in particular to a series advection pump with pulsation suppression function. Background Technology

[0002] The advection pump is one of the most basic and crucial components in liquid chromatography (including ion chromatography) delivery systems. Its main function is to deliver the eluent to the column under high pressure using equal or gradient concentrations for elution of the analyte. The performance of the advection pump directly affects the stability, accuracy, and lifespan of the entire chromatographic system. Currently, many domestic manufacturers of advection pumps for ion chromatography use uniform rotation. They adjust the uniform rotation speed according to the set flow rate or modify the cam shape to optimize the impact of output pulsation on actual use. However, the pressure fluctuations caused by the periodic movement of the advection pump directly affect the detector's output signal, thus affecting experimental results. This is particularly problematic for the analysis of low-concentration and trace components, severely impacting quantification and even preventing detection.

[0003] The technical problem to be solved by this invention is how to design a series-type horizontal flow pump that can effectively suppress output pulsation and deliver liquid stably and evenly. Utility Model Content

[0004] This invention provides a series-connected advection pump with pulsation suppression function, which effectively suppresses the output pulsation of the advection pump, ensures the continuity and uniformity of liquid delivery, and finely adjusts the output flow rate of the advection pump to improve the stability of the detection signal, making the instrument more accurate in detecting and analyzing samples with low concentration and trace components.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a series-type horizontal flow pump with pulsation suppression function, including a housing, a servo motor installed inside the housing, a main control board disposed at the top of the housing, the servo motor being electrically connected to the main control board, a regulating valve disposed on the front of the housing, an output port connected to the top of the regulating valve, and a pressure sensor connected to the end of the regulating valve, and a pump body structure disposed inside the housing; the pump body structure includes a housing, a drive shaft, a cam, a transmission rod, a clamping wheel, a plunger, a pump head, a one-way valve, and a liquid inlet; the housing is fixed inside the housing, and the inside of the housing... A drive shaft is rotatably connected to the housing and is driven by a servo motor. Cams are fixedly connected to both sides of the outer wall of the drive shaft. Transmission rods are movably connected to both sides of the housing. A clamping wheel is rotatably connected to the end of the transmission rod near the cam. The clamping wheel is connected to the cam. A plunger is pressed against the end of the transmission rod away from the clamping wheel. The pump head is mounted on the front of the housing. The plunger is movably connected to the pump head. One-way valves are connected to both the upper and lower ends of the right side of the pump head. The one-way valve on the bottom side is connected to a liquid inlet. The one-way valve on the top side is connected to a regulating valve.

[0007] Preferably, a guide assembly is provided on the outside of the transmission rod; the guide assembly includes a sealing sleeve, a fixing sleeve, a compression spring, a limiting plate, and a connecting rod; two sealing sleeves are provided and installed on both sides of the back of the pump head, the sealing sleeves are movably connected to the plunger, a compression spring is provided on the side of the sealing sleeve and the fixing sleeve that are close to each other, and a limiting plate is connected to the side of the fixing sleeve that is away from the sealing sleeve, and the limiting plate is fixedly connected to the pump head through the connecting rod.

[0008] Preferably, a transmission assembly is provided on the side of the housing; the transmission assembly includes a first synchronous pulley, a second synchronous pulley, and a synchronous belt; the first synchronous pulley is installed at the output end of the servo motor, the second synchronous pulley is installed at the end of the drive shaft, and the first synchronous pulley is connected to the second synchronous pulley via the synchronous belt.

[0009] Preferably, a speed sensor is installed on the housing below the second synchronous pulley, and the speed sensor is electrically connected to the main control board.

[0010] Preferably, a cooling fan is installed on the back of the housing, the cooling fan is electrically connected to the main control board, and heat dissipation holes are provided at equal intervals on both sides of the outer wall of the housing.

[0011] Preferably, a control component is provided on the front of the housing; the control component includes a display screen and control buttons; both the display screen and control buttons are mounted on the front of the housing and are electrically connected to the main control board.

[0012] Preferably, the regulating valve has a drain port connected to its side, and a knob is threadedly connected to the inner wall of the regulating valve.

[0013] Preferably, the pump head is provided with a rear flushing device on both the left and right sides.

[0014] Preferably, guide sleeves are fixedly connected to both sides of the interior of the housing, and the guide sleeves are movably connected to the transmission rod.

[0015] Preferably, the bottom sides of the outer casing are fixedly connected with feet at equal intervals.

[0016] The technical solution of this utility model has the following technical effects compared with the prior art: By driving the transmission rod and plunger to reciprocate through two cams, the two pump chambers connected in series continuously deliver liquid. The two cams compensate for each other during rotation, thereby reducing the fluctuation of liquid output pressure, improving the suppression effect of output pulsation, and ensuring the continuity and uniformity of liquid delivery. At the same time, the main control board precisely controls the speed of the servo motor based on the pressure signal fed back by the pressure sensor and finely adjusts the output flow of the horizontal flow pump, thereby improving the stability of the detection signal and making the instrument more accurate in detecting and analyzing samples with low concentration and trace components. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the series-connected horizontal flow pump with pulsation suppression function according to this utility model;

[0018] Figure 2 This is a schematic diagram of the appearance of the series-connected horizontal flow pump with pulsation suppression function according to this utility model;

[0019] Figure 3 This is a cross-sectional view of the series-connected horizontal flow pump with pulsation suppression function according to this utility model;

[0020] Figure 4 This is a schematic diagram of the servo motor, cam, and speed sensor in the series-connected horizontal flow pump with pulsation suppression function of this utility model.

[0021] Figure 5 for Figure 4 A magnified view of a portion of region A in the middle.

[0022] Reference numerals: 1. Housing; 2. Servo motor; 3. Main control board; 4. Regulating valve; 5. Output port; 6. Pressure sensor; 7. Pump body structure; 71. Housing; 72. Drive shaft; 73. Cam; 74. Transmission rod; 75. Pressing wheel; 76. Plunger; 77. Pump head; 78. Check valve; 79. Liquid inlet; 8. Guide assembly; 81. Sealing sleeve; 82. Fixing sleeve; 83. Compression spring; 84. Limiting plate; 85. Connecting rod; 9. Transmission assembly; 91. First synchronous pulley; 92. Second synchronous pulley; 93. Synchronous belt; 10. Speed ​​sensor; 11. Cooling fan; 12. Heat dissipation hole; 13. Control assembly; 131. Display screen; 132. Control button; 14. Drain port; 15. Knob; 16. Post-flushing; 17. Guide sleeve; 18. Foot. Detailed Implementation

[0023] like Figures 1-5 As shown, this utility model provides a series-type parallel flow pump with pulsation suppression function, including a housing 1. A servo motor 2 is installed inside the housing 1, and a main control board 3 is set at the top of the inside of the housing 1. The servo motor 2 is electrically connected to the main control board 3. A regulating valve 4 is set on the front of the housing 1. The top of the regulating valve 4 is connected to an output port 5, and the end of the regulating valve 4 is connected to a pressure sensor 6. A pump body structure 7 is set inside the housing 1. The pump body structure 7 includes a housing 71, a drive shaft 72, a cam 73, a transmission rod 74, a clamping wheel 75, a plunger 76, a pump head 77, a one-way valve 78, and a liquid inlet 79. The housing 71 is fixed inside the housing 1, and the inside of the housing 71 can rotate. A drive shaft 72 is connected to a servo motor 2. Cams 73 are fixedly connected to both sides of the outer wall of the drive shaft 72. Transmission rods 74 are movably connected to both sides of the housing 71. A clamping wheel 75 is rotatably connected to the end of the transmission rod 74 near the cam 73. The clamping wheel 75 is connected to the cam 73. A plunger 76 is pressed and connected to the end of the transmission rod 74 away from the clamping wheel 75. A pump head 77 is installed on the front of the housing 1. The plunger 76 is movably connected to the pump head 77. One-way valves 78 are connected to both the upper and lower ends of the right side of the pump head 77. The one-way valve 78 located on the bottom side is connected to the liquid inlet 79. The one-way valve 78 located on the top side is connected to the regulating valve 4.

[0024] In the specific implementation process, it is worth noting that the outer casing 1 is the protective casing of the horizontal flow pump, the servo motor 2 is the drive motor of the horizontal flow pump, and the casing 71 is the metal casing of the pump body. The servo motor 2 drives the drive shaft 72, causing the two cams 73 to rotate. The protruding parts of the two cams 73 are located on both sides of the drive shaft 72, and the two cams 73 are respectively pressed against the clamping wheel 75 of the transmission rod 74. The liquid is delivered to one side of the pump cavity inside the pump head 77 through the liquid inlet 79. When the cams 73 rotate, they push the transmission rod 74. The reciprocating motion of plunger 76 and pump head 4 causes the liquid in the pump chamber to be unidirectionally transported to the pump chamber on the other side of pump head 77 through check valve 78, realizing the series connection of the two pump chambers in pump head 77. With the reciprocating motion of plunger 76 in the other pump chamber, the liquid is unidirectionally transported to regulating valve 4, and the liquid is continuously transported through the output port 5 of regulating valve 4. At the same time, the pressure sensor 6 senses the liquid output pressure and transmits the sensing signal to the main control board 3 in real time, so that the control system can automatically adjust the speed of servo motor 2 according to the real-time pressure. This allows for precise control of the output flow and pressure of the horizontal flow pump, improving its delivery efficiency and stability. Through the cooperation between the housing 1, servo motor 2, main control board 3, regulating valve 4, output port 5, pressure sensor 6, housing 71, drive shaft 72, cam 73, transmission rod 74, clamping wheel 75, plunger 76, pump head 77, check valve 78, and inlet 79, the reciprocating motion of the transmission rod 74 and plunger 76, driven by two cams 73, enables the two series-connected pump chambers to continuously deliver liquid. The two cams 73 rotate... During operation, they compensate each other to reduce fluctuations in liquid output pressure, improve the suppression of output pulsation, and ensure the continuity and uniformity of liquid delivery. At the same time, the main control board 3 precisely controls the speed of the servo motor 2 based on the pressure signal fed back by the pressure sensor 6, thereby achieving fine adjustment of the output flow of the advection pump, which improves the stability of the detection signal and makes the instrument more accurate in detecting and analyzing samples with low concentration and trace components. The specific models of the servo motor 2, main control board 3 and pressure sensor 6 are not limited, as long as they meet the usage requirements.

[0025] In one feasible embodiment, a guide assembly 8 is provided on the outside of the transmission rod 74; the guide assembly 8 includes a sealing sleeve 81, a fixing sleeve 82, a compression spring 83, a limiting plate 84, and a connecting rod 85; two sealing sleeves 81 are provided and installed on both sides of the back of the pump head 77. The sealing sleeves 81 are movably connected to the plunger 76. A compression spring 83 is provided on the side of the sealing sleeve 81 and the fixing sleeve 82 that are close to each other. The side of the fixing sleeve 82 that is away from the sealing sleeve 81 is connected to the limiting plate 84. The limiting plate 84 is fixedly connected to the pump head 77 through the connecting rod 85.

[0026] In the specific implementation process, it is worth noting that when the transmission rod 74 reciprocates, the sealing sleeve 81 keeps the pump cavity inside the pump head 77 closed, the fixed sleeve 82 moves synchronously with the transmission rod 74, and the compression spring 83 provides elastic force to the fixed sleeve 82 away from the pump head 77. When the protruding part of the cam 73 rotates to the side of the pressing wheel 75, it pushes the transmission rod 74 and the fixed sleeve 82 to move closer to the pump head 77, compressing the compression spring 83. As the cam 73 continues to rotate, under the elastic force of the compression spring 83, the transmission rod 74 and the fixed sleeve 82 move away from the pump head 77, so that the pressing wheel 75 and the cam 73 remain pressed together. At the same time, the fixed sleeve 82 is limited by the limiting plate 84, which restricts the range of motion of the transmission rod 74, ensuring that the reciprocating motion of the transmission rod 74 is within the predetermined stroke, thereby ensuring the stability and accuracy of the transmission rod 74 during movement.

[0027] In one possible implementation, a transmission assembly 9 is provided on the side of the housing 71; the transmission assembly 9 includes a first synchronous pulley 91, a second synchronous pulley 92 and a synchronous belt 93; the first synchronous pulley 91 is mounted on the output end of the servo motor 2, the second synchronous pulley 92 is mounted on the end of the drive shaft 72, and the first synchronous pulley 91 is connected to the second synchronous pulley 92 via the synchronous belt 93.

[0028] In the specific implementation process, it is worth noting that the first synchronous pulley 91 is installed at the output end of the servo motor 2, and the second synchronous pulley 92 is installed at the end of the drive shaft 72. When the first synchronous pulley 91 rotates, the second synchronous pulley 92 is driven to rotate through the synchronous belt 93, ensuring the uniform transmission of driving force. When the speed of the servo motor 2 changes, the speed of the drive shaft 72 is adjusted synchronously, effectively reducing energy loss in the transmission process, improving transmission efficiency, and helping to improve the user experience of the entire horizontal flow pump.

[0029] In one feasible embodiment, a speed sensor 10 is mounted on the housing 1 below the second synchronous pulley 92, and the speed sensor 10 is electrically connected to the main control board 3.

[0030] In the specific implementation process, it is worth noting that the speed sensor 10 is used to monitor the speed of the second synchronous pulley 92 in real time and transmit the sensing signal to the main control board 3 in real time. This allows the main control board 3 to accurately control the speed of the servo motor 2 based on the signals fed back by the pressure sensor 6 and the speed sensor 10, thereby accurately controlling the output flow and pressure of the parallel flow pump. The specific model of the speed sensor 10 is not limited, as long as it meets the usage requirements.

[0031] In one feasible embodiment, a cooling fan 11 is installed on the back of the housing 1, the cooling fan 11 is electrically connected to the main control board 3, and heat dissipation holes 12 are provided at equal intervals on both sides of the outer wall of the housing 1.

[0032] In the specific implementation process, it is worth noting that the cooling fan 11 works under the control of the main control board 3 to ensure that the servo motor 2 and the main control board 3 will not be affected by overheating during long-term operation, thereby improving the stability and service life of the equipment. The heat dissipation holes 12 help with natural convection heat dissipation, further enhancing the heat dissipation effect and ensuring that the equipment can maintain good heat dissipation performance in various working environments. The specific model of the cooling fan 11 is not limited, as long as it meets the usage requirements.

[0033] In one feasible embodiment, a control component 13 is provided on the front of the housing 1; the control component 13 includes a display screen 131 and control buttons 132; both the display screen 131 and the control buttons 132 are mounted on the front of the housing 1, and both the display screen 131 and the control buttons 132 are electrically connected to the main control board 3.

[0034] In the specific implementation process, it is worth noting that the display screen 131 is used to display the output flow and output pressure of the horizontal flow pump in real time, and the control button 132 is used to preset the output flow of the horizontal flow pump. The specific models of the display screen 131 and the control button 132 are not limited, as long as they meet the usage requirements.

[0035] In one feasible embodiment, the side of the regulating valve 4 is connected to a drain port 14, and the inner wall of the regulating valve 4 is threaded with a knob 15.

[0036] In the specific implementation process, it is worth noting that by rotating the knob 15, the channel of the drain port 14 is connected to the regulating valve 4, which facilitates the discharge of residual liquid or gas in the pump head 77 and ensures the purity of the delivered liquid.

[0037] In one feasible embodiment, a back flush 16 is provided on both the left and right sides of the pump head 77.

[0038] In the specific implementation process, it is worth noting that the post-flushing 16 can connect the chamber between the plunger 76 and the sealing sleeve 81 with the outside, thus preventing crystallization during the reciprocating motion of the plunger 76 and ensuring the smoothness and fluidity of the reciprocating motion of the plunger 76.

[0039] In one feasible embodiment, guide sleeves 17 are fixedly connected to both sides of the interior of housing 71, and the guide sleeves 17 are movably connected to transmission rod 74.

[0040] In the specific implementation process, it is worth noting that the guide sleeve 17 is used to guide the transmission rod 74 and ensure the stability of the reciprocating motion of the transmission rod 74.

[0041] In one feasible embodiment, the bottom sides of the housing 1 are fixedly connected with feet 18 at equal intervals.

[0042] In the specific implementation process, it is worth noting that the foot 18 is used to support the horizontal flow pump and is made of rubber material to reduce the impact of vibration on the equipment, reduce noise, and ensure the stability of the horizontal flow pump during operation.

[0043] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A series-type horizontal flow pump with pulsation suppression function, comprising a housing, characterized in that: A servo motor is installed inside the housing, and a main control board is located at the top of the housing. The servo motor is electrically connected to the main control board. A regulating valve is located on the front of the housing. An output port is connected to the top of the regulating valve, and a pressure sensor is connected to the end of the regulating valve. A pump body structure is located inside the housing. The pump body structure includes a housing, a drive shaft, a cam, a transmission rod, a clamping wheel, a plunger, a pump head, a check valve, and a liquid inlet; The housing is fixed inside the outer shell. A drive shaft is rotatably connected inside the housing and is driven by a servo motor. Cams are fixedly connected to both sides of the outer wall of the drive shaft. Transmission rods are movably connected to both sides of the housing. A clamping wheel is rotatably connected to the end of the transmission rod near the cam. The clamping wheel is connected to the cam. A plunger is pressed against the end of the transmission rod away from the clamping wheel. The pump head is mounted on the front of the outer shell. The plunger is movably connected to the pump head. One-way valves are connected to both the upper and lower ends of the right side of the pump head. The one-way valve on the bottom side is connected to a liquid inlet, and the one-way valve on the top side is connected to a regulating valve.

2. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: The transmission rod is provided with a guide assembly on its exterior; The guide assembly includes a sealing sleeve, a fixing sleeve, a compression spring, a limiting plate, and a connecting rod; Two sealing sleeves are provided and installed on both sides of the back of the pump head. The sealing sleeves are movably connected to the plunger. A compression spring is provided on the side of the sealing sleeve and the fixed sleeve that are close to each other. A limit plate is connected to the side of the fixed sleeve that is away from the sealing sleeve. The limit plate is fixedly connected to the pump head through a connecting rod.

3. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: A transmission assembly is provided on the side of the housing; The transmission assembly includes a first synchronous pulley, a second synchronous pulley, and a synchronous belt; The first synchronous pulley is installed at the output end of the servo motor, and the second synchronous pulley is installed at the end of the drive shaft. The first synchronous pulley is connected to the second synchronous pulley via a synchronous belt.

4. The series-type horizontal flow pump with pulsation suppression function according to claim 3, characterized in that: A speed sensor is mounted on the housing below the second synchronous pulley, and the speed sensor is electrically connected to the main control board.

5. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: A cooling fan is installed on the back of the housing, and the cooling fan is electrically connected to the main control board. Heat dissipation holes are provided at equal intervals on both sides of the outer wall of the housing.

6. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: The front of the housing is provided with control components; The control components include a display screen and control buttons; The display screen and control buttons are both mounted on the front of the housing and are electrically connected to the main control board.

7. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: The regulating valve has a drain port connected to its side, and a knob is threaded onto its inner wall.

8. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: The pump head is equipped with rear flushing on both the left and right sides.

9. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: Guide sleeves are fixedly connected to both sides of the interior of the housing, and the guide sleeves are movably connected to the transmission rod.

10. The series-type horizontal flow pump with pulsation suppression function according to claim 1, characterized in that: Both sides of the bottom of the outer casing are fixedly connected with feet at equal intervals.

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