CN113915446A - A pulsation damper and fluid transfer system for fluid transfer - Google Patents

Abstract

The invention relates to a pulse damper (3) for fluid transfer and a fluid transfer system, wherein the pulse damper (3) for fluid transfer comprises a closed rigid shell, an elastic bag (13), a fluid inlet and a fluid outlet, a containing cavity (18) is formed in the rigid shell, the elastic bag (13) is arranged in the containing cavity (18), the fluid inlet and the fluid outlet are arranged on the rigid shell, the fluid inlet and the fluid outlet are communicated with a buffer cavity (19) of the elastic bag (13), and transferred fluid can flow into the pulse damper (3) through the fluid inlet and flow out of the pulse damper (3) through the fluid outlet. The pulse damper can monitor the running state of the fluid transmission pipeline in real time and timely process abnormal conditions, can effectively reduce the fluid transmission flow and flow velocity pulsation, and realizes non-contact fluid pressure monitoring.

Description

A pulsation damper and fluid transfer system for fluid transfer

technical field

The invention belongs to the technical field of fluid transmission, and in particular relates to a pulse damper and a fluid transmission system for fluid transmission.

Background technique

The fluid transfer pump is the core power component of the fluid transfer system, and the power of the pump body itself is usually provided by the motor. An open-loop system is used between the motor controller and the motor. The motor controller controls the motor operation in one direction, but the motor controller cannot obtain the actual running status of the motor and the pump body and the running status of the transmission pipeline.

Taking a typical peristaltic pump for fluid transfer as an example, during operation of the peristaltic pump, the pump head may unexpectedly cause the roller to stop, the pipeline is squeezed and blocked, the hose moves unexpectedly, and the pipeline is damaged and fluid leaks. For example, fluid leakage will cause the working parts to be corroded and damaged and unable to operate normally, the unexpected movement of the hose and the abnormal bending will cause the pipeline in the fluid transfer pump to block, and large foreign objects will appear in the pipeline transmission liquid, etc. Once the above situation occurs, it may also cause damage to the internal drive module of the peristaltic pump and failure of the transmission system. At this time, if the user cannot obtain the fault information in time, it will further lead to interruption of actual production or experiment, and liquid pollution, resulting in more serious consequences.

At the same time, the existing fluid transfer pumps, especially the plunger pump, diaphragm pump, peristaltic pump, etc., have different degrees of instantaneous flow pulsation inside the pipeline during the process of outputting fluid, and the speed of the output fluid at different times is not uniform. It affects the flow stability of the outlet end of the fluid transmission system and reduces the accuracy of liquid transmission.

Therefore, how to minimize or even eliminate flow pulsation has become a common problem in the field of fluid transmission. In order to reduce the fluid pulsation of the fluid transfer pump to maintain the flow stability at the outlet end, it is a common practice to install a pulsation damper in the pipeline of the flow transfer system. However, the common problem of the existing pulse damper is that the volume is too large, and the internal space of the pulse damper needs to be filled before it can be used normally; and when it is stopped, the fluid inside the pulse damper will be slowly discharged, causing unnecessary Waste, the pulsation damper needs to be filled again when restarting, and the efficiency is low.

SUMMARY OF THE INVENTION

In order to solve the technical problems that the above-mentioned fluid transmission pump cannot obtain the running state in real time during the operation process and the pulse damper in the pipeline has large internal space, inconvenient use and waste, the present invention provides a pulse damper for fluid transmission and fluid transfer system.

The pulsation damper for fluid transmission includes a closed rigid shell, an elastic bladder, a fluid inlet and a fluid outlet, a accommodating cavity is formed in the rigid shell, the elastic bladder is arranged in the accommodating cavity, and the fluid An inlet and a fluid outlet are provided on the rigid housing, the fluid inlet and fluid outlet communicate with the buffer cavity of the elastic bladder, and the fluid being transmitted can flow into the pulsation damper through the fluid inlet and from the fluid outlet through the fluid outlet. out of the pulse damper.

In one embodiment, the rigid housing includes a housing body and a sealing cover, the housing body is cylindrical, and one end is provided with an opening, and the sealing cover is hermetically and fixedly mounted on the opening of the housing body.

In one embodiment, the housing body is cylindrical, the lower end is open to form an opening, and an annular stopper is provided on the inner wall of the lower end of the housing body; the sealing cover is embedded in the opening of the housing body, and is pressed by The tight block presses the sealing cover on the annular stop part, so that the edge of the sealing cover abuts against the annular stop part to form a sealing structure.

In one embodiment, the sealing cover is disc-shaped.

In one embodiment, the pressing block is in interference fit with the inner wall of the opening of the housing body or is screwed at the opening of the housing body through a threaded structure.

In one embodiment, the fluid inlet and the fluid outlet are provided on the sealing cover, the opening of the elastic bag is sealingly arranged on the sealing cover, and the fluid inlet and the fluid outlet are in direct communication with the buffer cavity of the elastic bag.

In one embodiment, the pulsation damper further includes an input line and an output line, the input line is inserted into the fluid inlet from the outside of the sealing cover, and the output line is connected from the seal The outside of the cover is plugged into the fluid outlet.

In one embodiment, the pulsation damper further includes a pressure detection device, the pressure detection device is communicated with the accommodating cavity, and can monitor the pressure in the accommodating cavity between the elastic bladder and the rigid shell.

In one embodiment, the rigid casing is further provided with a pressure regulating device for adjusting the pressure in the accommodating cavity between the elastic bladder and the rigid casing.

In one embodiment, the pressure regulating device is a pressure regulating plug rod, and the pressure regulating plug rod includes a plug head and a plug rod; the plug head is arranged in a cylindrical rigid housing, and is connected with the accommodating cavity side of the rigid housing. The wall is slidably sealed and connected; one end of the plug rod is connected with the plug head, and the other end protrudes out of the rigid shell; a sealing structure is provided on the part of the rigid shell that is in contact with the plug rod; or,

The pressure regulating device is a pressure regulating valve.

The fluid delivery system includes a fluid delivery pump and the pulsation damper as described above, the output end of the fluid delivery pump being in communication with the fluid inlet of the pulsation damper.

In one embodiment, the fluid transmission system further includes a controller, the pulse damper includes a pressure detection device, the controller is electrically connected to the pressure detection device and the fluid transmission pump, respectively, and the controller obtains the detected pressure of the pressure detection device. pressure value, when the detected pressure value is within a predetermined range, it is determined that the fluid transmission system has reached a working state, and the fluid transmission pump is adjusted to operate according to the set parameters.

In one embodiment, the fluid transmission system further includes a switch, the switch is arranged on one side of the output pipeline of the pulse damper, the controller is electrically connected with the switch, and can control the switch state of the switch , to open and close the fluid output of the pulse damper.

In one embodiment, the pulse damper further comprises a pressure regulating device, the controller is electrically connected to the pressure regulating device through an actuator, and/or the fluid transfer pump is preferably a peristaltic pump.

Beneficial effects of the present invention: The pulse damper and fluid transmission system for fluid transmission proposed in the embodiment of the present invention can absorb the fluid flow and flow rate through the double buffering effect of the elasticity of the elastic bag and the air pressure of the sealing gas in the accommodating cavity. The fluctuating peaks and troughs can greatly reduce the output flow and flow rate pulsation of the fluid transfer pump; the transmitted fluid is not in direct contact with the pressure detection device, which overcomes the defect that the existing pipeline pressure detection device directly contacts the fluid, and the use process is safe and hygienic, especially suitable It is suitable for fields with high requirements on hygiene level such as food, medicine, and reagents, and applications for transmitting corrosive fluids; the pulse damper of the embodiment of the present invention is small in size, low in replacement cost of consumables, and is suitable for various fluids such as acid, alkali, and medicament. type.

In addition, the fluid transmission system of the embodiment of the present invention realizes the real-time monitoring of the operating conditions of the fluid transmission pump body and the transmission pipeline through the cooperation of the fluid transmission pump, the controller, the pulse damper and the switch, and can issue an alarm in time and automatically deal with it. Abnormal conditions; when the fluid transfer work is completed or the system is suspended, the switch is automatically closed to avoid fluid loss in the damper.

Description of drawings

1 is a schematic structural diagram of a pulse damper for fluid transmission proposed in a first embodiment of the present invention;

2 is a schematic structural diagram of another pulsation damper for fluid transmission proposed by the first embodiment of the present invention;

3 is a schematic structural diagram of a fluid transmission system proposed by a third embodiment of the present invention;

4 is a control logic block diagram of a fluid transmission system proposed by a third embodiment of the present invention;

5a-5e are real-time flow comparison diagrams of the flow transmission system with the flow transmission system of the embodiment of the present invention and the flow transmission system of the control group (without the pulse damper of the embodiment of the present invention).

The reference numerals are specified as follows: fluid transfer pump 1, pressure detection device 2, pulse damper 3, first communication line 4, second communication line 5, switch 6, input hose 7, output hose 8, controller 9. The third communication line 10, the housing main body 11, the sealing cover 12, the elastic bag 13, the input pipeline 14, the output pipeline 15, the pressing block 16, the mounting bracket 17, the accommodating cavity 18, the buffer cavity 19, the pressure regulating device 20

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. However, those skilled in the art know that the present invention is not limited to the accompanying drawings and the following embodiments.

The first embodiment of the present invention proposes a pulsation damper 3 for fluid transmission. As shown in FIG. 1 , the pulsation damper 3 includes a closed rigid shell, an elastic bladder 13 , a fluid inlet and a fluid outlet. The rigid An accommodating cavity 18 is formed in the shell, the elastic bag 13 is arranged in the accommodating cavity 18, the fluid inlet and the fluid outlet are arranged on the rigid shell, the fluid inlet and the fluid outlet and the buffer of the elastic bag 13 The cavity 19 communicates through which the fluid being conveyed can flow into the pulsation damper 3 and flow out of the pulsation damper 3 through the fluid outlet.

Specifically, as shown in FIG. 1 , the rigid housing includes a housing body 11 and a sealing cover 12 . The housing main body 11 is cylindrical, and one end is provided with an opening. The sealing cover 12 is airtightly and fixedly mounted on the opening of the housing main body 11 . In this embodiment, the housing main body 11 is cylindrical, the lower end is open to form an opening, an annular stopper is provided on the inner wall of the lower end of the housing main body 11 ; the sealing cover 12 is disc-shaped and is embedded in the housing main body 11, and the disc-shaped sealing cover is pressed against the annular stop part by the pressing block 16, so that the edge of the disc-shaped sealing cover abuts against the annular stop part to form a sealing structure. The pressing block 16 is in interference fit with the inner wall of the opening of the housing main body 11 or screwed at the opening of the housing main body 11 through a threaded structure.

The elastic bag 13 is made of an elastomer material with a certain modulus, and the elastomer material is not limited to silica gel, rubber, elastic plastic, etc. The elastic bag 13 has openings for fluid to flow in and out. In this embodiment, the fluid inlet and the fluid outlet are arranged on the sealing cover 12 , the opening of the elastic bag 13 is sealed and arranged on the sealing cover 12 , the fluid inlet and the fluid outlet and the buffering of the elastic bag 13 The cavity 19 communicates directly. In this way, the elastic bag 13 is disposed on the sealing cover 12 through its open end, so that the elastic bag 13 can be removed from the housing main body 11 along with the sealing cover 12, which is convenient for equipment maintenance. The pulsation damper 3 further includes an input line 14 and an output line 15, the input line 14 is inserted into the fluid inlet from the outside of the sealing cover 12, and the output line 15 extends from the seal. The outer side of the cover 12 is plugged into the fluid outlet. During operation, the fluid from the outside of the pulse damper 3 can enter the pulse damper 3 through the input pipeline 14 and be discharged from the pulse damper 3 through the output pipeline 15. The fluid is only connected to the input pipeline 14, the output pipeline 15, The elastic bladder 13 is in contact with the sealing cover 12 to minimize the chance of fluid being contaminated.

The pulsation damper 3 of the present invention can reduce the pulsation of the fluid transmission flow during the fluid transmission process. In the initial working stage, the pumping fluid from the outside of the pulse damper 3 enters the buffer cavity 19 of the elastic bladder 13 through the input pipeline 14. Based on the external pumping pressure, the elastic bladder 13 elastically deforms in the accommodating cavity 18, and the volume gradually increases. Increase, the occupied volume of the accommodating cavity 18 also gradually increases, so that the volume of the accommodating cavity 18 between the elastic bag 13 and the rigid shell gradually decreases, and the pressure gradually increases. When the pressures on the inner and outer sides of the side wall of the elastic bag 13 reach an equilibrium state, the fluid can be normally transmitted through the output pipeline 15 . During normal operation, under the action of the fluid transfer pump, when the fluid flow into the buffer chamber 19 through the input pipeline 14 transitions from the average value to the peak value of fluctuation, the internal pressure of the buffer chamber 19 increases, the buffer chamber 19 expands, and the elasticity of the buffer chamber 19 increases. When the bladder 13 is inflated, the flow rate of the fluid discharged from the buffer chamber 19 through the output line 15 is lower than the flow rate input from the input line 14, but it can still be maintained at an average level; when the fluid entering the buffer chamber 19 through the input line 14 When the flow rate transitions from the average value to the fluctuating valley value, the internal pressure of the buffer chamber 19 decreases, the buffer chamber 19 decreases, the elastic bag 13 contracts, and the flow rate of the fluid discharged from the buffer chamber 19 through the output pipeline 15 is higher than that from the input pipeline 14 The incoming flow is high but still average. Therefore, the addition of the pulsation damper 3 can reduce the pulsation of the fluid transmission flow, so that the output fluid flow is stabilized at the average flow level.

Since the cross-sectional area of the fluid flowing through is constant, the flow rate is positively related to the flow rate, that is: flow rate = flow rate * cross-sectional area. Therefore, the pulsation damper 3 of the present invention can simultaneously reduce the pulsation of the fluid transmission flow rate during the fluid transmission process.

In addition, the pulse damper 3 further includes a pressure detection device 2, which is communicated with the accommodating cavity 18, and can monitor the pressure in the accommodating cavity 18 between the elastic bladder 13 and the rigid shell. Preferably, the pulse damper 3 further includes a detachable mounting bracket 17 arranged on the inner wall of the rigid housing, and the detection component of the pressure detection device 2 is arranged on the mounting bracket 17 . Those skilled in the art should know that the detection component of the pressure detection device 2 should be arranged at a position away from the elastic bag 13 to avoid contact with the elastic bag. When the fluid transmission pipeline is blocked or damaged, the pressure value detected by the pressure detection device 2 will fluctuate abnormally, so that by monitoring the pressure value in the accommodating cavity 18, it can be judged whether the fluid transmission system is working normally, And an alarm can be issued or displayed based on abnormal work.

The above-mentioned pressure detection device 2 can be a pressure sensor, a distance sensor for monitoring the distance between the mounting frame 17 and the elastic bag 13, a barometer, a scale mark, etc. that can measure and/or display the pressure/elastic bag deformation. The device has a mark display It can display the pressure in the accommodating cavity through the display device connected to the outside of the pulse damper 3. When the fluid transmission system only includes the fluid transmission pump and the pulsation damper, the user can judge the pressure in the accommodating cavity 18 through the scale. Whether it is within the normal pressure range, so as to achieve simple fault monitoring capabilities.

More preferably, the rigid housing is also provided with a pressure regulating device 20 for adjusting the pressure in the accommodating cavity 18 between the elastic bladder 13 and the rigid shell, and the pressure in the accommodating cavity 18 can be adjusted according to actual use conditions. pressure to adjust.

In one embodiment, as shown in FIG. 2 , the pressure regulating device 20 is a pressure regulating plug rod, and the pressure regulating plug rod includes a plug head and a plug rod. The plug head is arranged in the cylindrical rigid shell, and is slidably and sealedly connected with the side wall of the accommodating cavity 18 of the rigid shell. One end of the plug rod is connected with the plug head, and the other end protrudes out of the rigid shell. A sealing structure is provided on the contact position between the rigid shell and the plug rod to ensure the airtightness of the accommodating cavity 18 . During operation, by pushing and pulling the plug head with the plug rod, the space size of the area of the accommodating cavity 18 where the elastic bag 13 is located can be adjusted, so that the pressure in the pulse damper 3 can be adjusted.

In another embodiment, the pressure regulating device 20 is a pressure regulating valve, and the pressure in the pulse damper 3 can be adjusted by opening/closing the pressure regulating valve.

A fluid transmission system proposed by the second embodiment of the present invention includes a fluid transmission pump and the above-mentioned pulsation damper 3 , an output end of the fluid transmission pump 3 and a fluid inlet of the pulsation damper 3 connected, the fluid transfer pump is preferably a peristaltic pump.

The related working principle has been described above, and will not be repeated here.

The third embodiment of the present invention proposes a fluid transmission system, as shown in FIG. 3 and FIG. 4 , the fluid transmission system includes a fluid transmission pump 1 , a pulse damper 3 as described in the first embodiment, and a controller 9. The pulse damper 3 includes a pressure detection device 2 .

The output of the fluid transfer pump 3 is connected to the input line 14 of the pulsation damper 3 , for example via the input hose 7 . The controller 9 is electrically connected to the pressure detection device 2 and the fluid transfer pump 1 through the first communication line 4 and the third communication line 10, for example, the communication lines in FIG. 3 are wired lines, of course, wireless lines can also be used.

In the start-up stage of the fluid transfer system of the embodiment of the present invention, the elastic bag 13 is not filled, the accommodating cavity 18 between the elastic bag 13 and the rigid shell is in a low pressure state, the controller 9 controls the fluid transfer pump 1 to operate to pump the fluid, Generally, the fluid is filled into the buffer cavity 19 of the elastic bag 13 in a short time, and the pressures on the inner and outer sides of the side wall of the elastic bag 13 are balanced, and the fluid transmission system reaches the working state. The pressure detection device 2 monitors the pressure of the accommodating cavity 18 between the elastic bag 13 and the rigid shell, the controller 9 obtains the pressure value detected by the pressure detection device 2, and when the detected pressure value is within a predetermined range, determines the The fluid transfer system is in working condition. The controller 9 then adjusts the operating state of the fluid transfer pump 1 to the set parameter output operating state to shorten the waiting time for the outlet of the fluid transfer system.

In the stop phase of the fluid transmission system, the elastic bag 13 is filled with fluid, the accommodating cavity 18 between the elastic bag 13 and the rigid shell is in a high pressure state, and the switch on the output pipeline of the pulse damper 3 is directly closed and the fluid is stopped. The operation of the transfer pump 1 ensures that no fluid is discharged from the outlet of the fluid transfer system to avoid pollution. After the fluid transmission system is stopped, if it needs to continue to be used, the fluid transmission pump 1 can be started and the switch on the output pipeline of the pulse damper 3 can be turned on, and the fluid transmission system can be used immediately. In addition, after the fluid transmission system is stopped, the fluid transmission pump 1 can be set to reverse, so as to withdraw the fluid in the buffer chamber 19 of the elastic bladder 13 . When the fluid transmission system is shut down, if the liquid in the fluid transmission system needs to be emptied, the fluid inlet of the fluid transmission system can be disconnected, the fluid transmission pump 1 can be started, and the switch on the output pipeline of the pulse damper 3 can be turned on to transmit the fluid. Fluid in the system is evacuated.

The fluid transmission system further includes a switch 6, and the switch 6 can be an electromagnetic switch, an on-off valve, or other device for closing the pipeline. The switch 6 is arranged on one side of the output pipeline 15 of the pulse damper 3 , and is used to control the opening and closing of the fluid output of the pulse damper 3 . In this embodiment, the switch 6 is arranged on the output hose 8 connected to the output pipeline 15 of the pulse damper 3 . The controller 9 is electrically connected to the switch 6 through, for example, the second communication line 5 , and can control the switching state of the switch 6 .

In the startup phase of the fluid transmission system, the switch 6 can be in an open or closed state, and the switch 6 in the closed state is more beneficial to shorten the waiting time for the outlet of the fluid transmission system.

When the transmission pipeline of the fluid transmission system is blocked or damaged, and the pressure value detected by the pressure detection device 2 exceeds the normal pressure range, the controller 9 issues an alarm, and at the same time the controller 9 also suspends the operation of the fluid transmission pump 1. The switch 6 is operated and closed to stop the output of fluid.

In the case where the pulse damper 3 includes the pressure regulating device 20 , the controller 9 is electrically connected to the pressure regulating device 20 through an actuator, so that the controller 9 can control the pressure regulating device 20 to adjust the pressure in the pulse damper 3 to Adjustment. For example, according to the pressure value detected by the pressure detection device 2, the pressure in the pulse damper 3 is adjusted to obtain a predetermined range.

With regard to the fluid transmission system of the third embodiment of the present invention, the inventor conducts a comparative test with the other two groups of fluid transmission systems. Among them, the rigid shell including the damper in the comparison group 1 adopts a non-hermetic structure, that is, the accommodating cavity outside the elastic bag is in pressure communication with the outside of the rigid shell; the comparison group 2 is a fluid transmission system that does not include a pulse damper; the embodiment of the present invention The fluid transmission system is used as the experimental group. In the experimental group, there are three types of impulse dampers. The only difference is that the wall thickness of the elastic bladder of the impulse damper is different, as follows:

ZN-Q0: The elastic bladder of the pulse damper adopts standard silicone membrane (thickness 0.4mm);

ZN-Q1: The elastic bladder of the pulse damper adopts a thickened silicone film (thickness 0.8mm);

ZN-Q2: The elastic bladder of the pulse damper adopts ultra-thin silicone membrane (thickness 0.2mm);

Comparison group 1: The elastic bladder of the pulse damper adopts an ultra-thin silicone membrane (thickness 0.4mm) and adopts a non-sealed rigid shell.

For the test instruments of the experimental group and the comparison groups 1 and 2, except for the difference between the pulse damper and the closed rigid shell, the same experimental instruments were used, including the fluid transfer pump (BT100 driver + YZ15 pump head, where the BT100 driver flow rate range is 0.0001-720mL/min, YZ15 pump head flow range 0.0006-420mL/min), pump head hose adopts 14# silicone tube (wall thickness 1.7mm, inner diameter 1.6mm), pulse damper and flowmeter, flowmeter for fluid transmission The flow of fluid at the outlet of the system is metered.

The test conditions are: normal temperature and pressure, using water as the transmission medium, setting the test speed of the drive motor to 10 rpm, and recording the outlet fluid flow of the fluid transmission system detected by the flowmeter.

The test data table is as follows: (unit: μL/min)

The liquid flow-time graph of the fluid transfer system using the ZN-Q0 pulse damper is shown in Figure 5a, and the real-time flow graph of the fluid transfer system using the ZN-Q1 pulse damper is shown in Figure 5b, using the ZN-Q2 pulse damper Figure 5c shows the real-time flow diagram of the fluid transfer system of the control group, and Figure 5d shows the real-time flow diagram of the fluid transfer system of the control group.

Test conclusion: Based on the fluid transmission system of the third embodiment of the present invention, the operation status of the fluid transmission pipeline can be monitored in real time, and when the fluid pipeline is blocked, because the pressure value detected by the pressure detection device exceeds the normal pressure range, the controller 9 issues an alarm, at the same time suspends the operation of the fluid transfer pump 1, and closes the switch 6, so that abnormal conditions can be dealt with in time. It can be seen from the above calculation that, compared with the comparison group 2, the comparison group 1 can eliminate about 50% of the fluid pulsation at the output end of the fluid transmission system, while the technical solution of the present invention can eliminate more than 90% of the fluid transmission system output. Based on the above statistical results, it can be seen that the effect of the closed rigid shell pulse damper of the present invention on fluid pulsation is significantly better than that of the non-closed rigid shell pulse damper, that is to say, the two-way buffer between the closed air pressure and the elastic bag in the accommodating cavity A synergistic damping effect is produced under the action.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (14)

1. A pulse damper (3) for fluid transmission, characterized in that it comprises a closed rigid casing, an elastic bladder (13), a fluid inlet and a fluid outlet, and an accommodation cavity (18) is formed in the rigid casing ), the elastic bag (13) is arranged in the accommodating cavity (18), the fluid inlet and the fluid outlet are arranged on the rigid shell, the fluid inlet and the fluid outlet are connected to the buffer cavity of the elastic bag (13) (19) Communication, the transmitted fluid can flow into the pulsation damper (3) through the fluid inlet and flow out of the pulsation damper (3) through the fluid outlet. 2. The pulsation damper (3) according to claim 1, characterized in that the rigid casing comprises a casing main body (11) and a sealing cover (12), the casing main body (11) is cylindrical, and one end is provided with an opening, and the sealing cover (12) is hermetically and fixedly mounted on the opening of the housing main body (11). 3. The pulsation damper (3) according to claim 2, characterized in that the housing main body (11) is cylindrical, the lower end is open to form an opening, and an annular stopper is provided on the inner wall of the lower end of the housing main body (11). The sealing cover (12) is inserted into the opening of the housing body (11), and the sealing cover (16) is pressed against the annular stop by the pressing block (16), so that the sealing cover (12) is The edge abuts against the annular stop to form a sealing structure. 4. The pulsation damper (3) according to claim 3, characterized in that, the sealing cover (12) is in the shape of a disc. 5 . The pulse damper ( 3 ) according to claim 3 , wherein the pressing block ( 16 ) has an interference fit with the inner wall of the opening of the housing body ( 11 ) or is screwed on the inner wall of the housing body ( 11 ) by means of a threaded structure. 6 . at the opening of the housing main body (11). 6. The pulsation damper (3) according to any one of claims 2-5, characterized in that, the fluid inlet and the fluid outlet are arranged on the sealing cover (12), and the opening of the elastic bag (13) is sealed Provided on the sealing cover (12), the fluid inlet and the fluid outlet are in direct communication with the buffer cavity (19) of the elastic bag (13). 7. The pulse damper (3) according to claim 6, characterized in that, the pulse damper (3) further comprises an input pipeline (14) and an output pipeline (15), the input pipeline ( 14) Plugging into the fluid inlet from the outside of the sealing cover (12), and inserting the output line (15) into the fluid outlet from the outside of the sealing cover (12). 8. The pulsation damper (3) according to claim 1, characterized in that, the pulsation damper (3) further comprises a pressure detection device (2), the pressure detection device (2) being communicated to the accommodating cavity In (18), the pressure in the accommodating cavity (18) between the elastic bladder (13) and the rigid shell can be monitored. 9. The pulsation damper (3) according to claim 8, characterized in that, the rigid casing is further provided with a pressure control device on the accommodating cavity (18) between the elastic bladder (13) and the rigid casing. Adjusted pressure regulator (20). 10. The pulse damper (3) according to claim 9, wherein the pressure regulating device (20) is a pressure regulating plug rod, and the pressure regulating plug rod comprises a plug head and a plug rod; the plug The head is arranged in the cylindrical rigid shell, and is slidably and sealedly connected with the side wall of the accommodating cavity (18) of the rigid shell; one end of the plug rod is connected with the plug head, and the other end protrudes out of the rigid shell; A sealing structure is provided on the part that is in contact with the plug rod; or, The pressure regulating device (20) is a pressure regulating valve. 11. A fluid transmission system, characterized in that it comprises a fluid transmission pump and the pulsation damper (3) according to one of claims 1-10, the output end of the fluid transmission pump (1) and the pulsation damper The fluid inlet of (3) is communicated. 12. The fluid transfer system according to claim 11, characterized in that the fluid transfer system further comprises a controller (9), the pulsation damper (3) comprises a pressure detection device (2), the controller (9) respectively electrically connected to the pressure detection device (2) and the fluid transfer pump (1), the controller (9) obtains the pressure value detected by the pressure detection device (2), and when the detected pressure value is within a predetermined range, determines that the fluid When the transmission system reaches the working state, the fluid transmission pump (1) is adjusted to operate according to the set parameters. 13. The fluid transmission system according to claim 12, characterized in that, the fluid transmission system further comprises a switch (6), and the switch (6) is arranged on one side of the output pipeline (15) of the pulse damper (3) , the controller (9) is electrically connected with the switch (6), and can control the switch state of the switch (6) to control the opening and closing of the fluid output of the pulse damper (3). 14. The fluid transmission system according to claim 12, wherein the pulse damper (3) further comprises a pressure regulating device (20), and the controller (9) is electrically connected to the pressure regulating device (20) through an actuator , and/or, the fluid transfer pump (1) is a peristaltic pump.

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