A buffer based on peristaltic pump pulse rejection

Abstract

The utility model relates to a kind of buffer based on peristaltic pump pulse inhibition, comprising: encapsulation shell, hard pipe is equipped in encapsulation shell, and adapter is installed in encapsulation shell, and the opening of hard pipe is sealedly connected with adapter, and fluid inlet is threadedly connected with adapter, and adapter is communicated with flow outlet;After the hard pipe of pulse fluid is introduced, buffer area is provided for fluid, channel volume is increased to weaken pulse energy, and the hard pipe of U shape prolongs fluid flow path and residence time, further enhances buffering, so that pulse energy is gradually dissipated, to ensure that fluid is smoothly transported to subsequent equipment or system.

Description

Technical Field

[0001] This invention belongs to the field of peristaltic pump technology, specifically relating to a buffer based on peristaltic pump pulse suppression. Background Technology

[0002] A peristaltic pump is a positive displacement pump that delivers fluid by squeezing a flexible tubing. Its core working principle is to mimic the contraction of intestinal peristalsis: by alternately squeezing and releasing the tubing through rollers or pressure blocks, a negative pressure is created inside the tubing, which propels the fluid to flow toward the outlet. It is widely used in medical / laboratory, food industry, water treatment, chemical and other fields.

[0003] In light scattering-based aerosol detection, a clean and stable sheath gas is required. The most fatal drawback of peristaltic pumps, which are used to provide sheath gas, is that the flow output of peristaltic pumps is inherently pulsating, caused by the alternating squeezing / releasing of the tubing by the rollers. This is an inherent property of peristaltic pumps and cannot be solved by the peristaltic pump itself for the time being. To address this issue, we propose a buffer based on peristaltic pump pulse suppression. Utility Model Content

[0004] The purpose of this invention is to provide a buffer based on peristaltic pump pulse suppression to solve the problems existing in the background art.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A buffer based on peristaltic pump pulse suppression, comprising:

[0007] Encapsulation shell;

[0008] A rigid tube, wherein the rigid tube is disposed inside the encapsulation housing;

[0009] Two adapters are provided. Two through slots are provided on one side of the encapsulation shell. The two adapters are respectively installed on the inner wall of the encapsulation shell and located inside the two through slots. The two adapters are sealed to the two openings of the rigid tube.

[0010] A fluid inlet, wherein the fluid inlet is threadedly connected to one end of any of the adapters that extends beyond the outer side of the encapsulation housing;

[0011] A flow outlet, which is connected to one end of another of the adapters that extends out of the outer side of the package housing.

[0012] Furthermore, the rigid tube is configured as a U-shape.

[0013] Further defining the fluid inlet, the end furthest from the encapsulation shell is configured as a stepped shaft, and is provided with a plurality of coaxial cylindrical segments with decreasing diameters along the axial direction, with adjacent cylindrical segments smoothly connected by a conical surface.

[0014] Further specified, a connector is sleeved on the outside of the flow outlet.

[0015] Furthermore, each of the two adapters has a slot at the end that abuts against the rigid tube, and both slots on the same side have an O-shaped sealing ring inside.

[0016] The beneficial effects of this utility model are:

[0017] 1. By adopting a rigid tube structure, compared with the flexible tube of a peristaltic pump, it will not deform with the pulse. It uses its internal space to provide a buffer area for the fluid, increases the channel volume to weaken the pulse energy, and directly suppresses the root cause of the pulse generation from the structure.

[0018] 2. By setting the rigid pipe to a U-shape, the flow path and residence time of the fluid in the pipe are extended, which can more effectively enhance the buffering effect on the pulse compared with ordinary straight pipes, and further weaken the pulse energy.

[0019] 3. By designing the end of the fluid inlet away from the encapsulation shell as a stepped shaft (multiple coaxial cylindrical segments with decreasing diameters, and adjacent segments smoothly transitioning through a conical surface), compared to a single-diameter inlet, it can adapt to external rubber tubes with different inner diameters, enhancing the compatibility and sealing of connections with external pipelines. Furthermore, the conical transition reduces the resistance to pipe insertion, preventing pipeline damage. Attached Figure Description

[0020] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of a buffer based on peristaltic pump pulse suppression according to the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of a buffer based on peristaltic pump pulse suppression according to the present invention.

[0023] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0024] The symbols for the main components are explained below:

[0025] Encapsulation housing 100, rigid tube 101, adapter 102, fluid inlet 103, flow outlet 104.

[0026] Connector 105, O-ring seal 106. Detailed Implementation

[0027] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] like Figures 1-3 As shown, a buffer based on peristaltic pump pulse suppression includes:

[0029] Encapsulation housing 100;

[0030] Rigid tube 101 is disposed inside the encapsulation housing 100;

[0031] Two adapters 102 are provided. Two through slots are provided on one side of the encapsulation shell 100. The two adapters 102 are respectively installed on the inner wall of the encapsulation shell 100 and located inside the two through slots. The two adapters 102 are sealed and connected to the two openings of the rigid tube 101.

[0032] Fluid inlet 103 is threadedly connected to one end of any adapter 102 that extends out of the outer side of the encapsulation housing 100.

[0033] The flow outlet 104 is connected to one end of another adapter 102 that extends out of the outer side of the encapsulation housing 100.

[0034] The housing 100 serves as the external protective structure for the entire buffer, providing installation space and support for internal components such as the rigid tube 101 and the adapter 102, while also protecting and securing the internal rigid tube 101 and the adapter 102.

[0035] The rigid tube 101 is the main channel for fluid flow inside the buffer, and its structural characteristics directly affect the suppression effect on peristaltic pump pulses.

[0036] Among them, the rigid tube 101 is made of rigid material. After the pulsed fluid from the peristaltic pump enters the rigid tube 101, the rigid structure of the rigid tube 101 prevents it from deforming with the pulse like the flexible hose of the peristaltic pump. At the same time, it uses its own channel space to allow the fluid to be buffered and adjusted. By increasing the channel volume through which the fluid flows, the energy of the pulse is weakened.

[0037] The adapter 102 connects the rigid pipe 101 to the external fluid inlet 103 and flow outlet 104, enabling fluid to flow inside and outside the buffer while ensuring the sealing of the connection to prevent fluid leakage.

[0038] Fluid inlet 103 serves as the inlet for the fluid to enter the buffer, receiving fluid from the peristaltic pump outlet rubber tube;

[0039] The fluid inlet 103 is threadedly connected to the adapter 102, and can be replaced according to connection requirements to make the buffer more widely applicable.

[0040] The flow outlet 104 serves as a buffered fluid outlet, smoothly delivering the fluid to subsequent equipment or systems.

[0041] The rigid tube 101 is set in a U-shape.

[0042] The U-shaped rigid tube 101 has a U-shaped structure that can extend the flow path and residence time of the fluid in the tube, and enhance the buffering effect against pulses.

[0043] When the gas with a pulse enters the U-shaped rigid tube 101, the rigid tube 101 will not deform with the pulse due to its rigidity, and the U-shaped structure increases the flow path of the gas, allowing the gas to have more space for energy release and pressure adjustment inside the tube, and the pulse is gradually weakened during the flow process.

[0044] The end of the fluid inlet 103 away from the encapsulation shell 100 is shaped as a stepped shaft, and has multiple coaxial cylindrical segments with decreasing diameters arranged sequentially along the axial direction. Adjacent cylindrical segments are smoothly connected by a conical surface.

[0045] Multiple coaxial cylindrical segments with decreasing diameters can correspond to different specifications of external rubber tube inner diameters. When the external pipe is fitted, a cylindrical segment that matches its own inner diameter can be selected to achieve a tight fit.

[0046] The smooth transition of the conical surface between adjacent cylindrical sections serves as a guide, reducing resistance when the pipe is inserted and avoiding pipe wrinkles or damage caused by abrupt changes in diameter. This further ensures the sealing of the connection, prevents gas leakage, and ensures that the pulsed gas from the peristaltic pump can stably enter the buffer.

[0047] A connector 105 is sleeved on the outside of the flow outlet 104.

[0048] The connector 105 is fitted on the outside of the flow outlet 104 and is mainly used to enhance the connection performance between the flow outlet 104 and the downstream pipeline, ensuring the stability and sealing of the connection.

[0049] Both adapters 102 have slots at the ends that abut against the rigid tube 101, and both slots on the same side have O-shaped sealing rings 106 inside.

[0050] After the adapter 102 is combined with the slot on the rigid tube 101, it forms an O-shaped slot, which matches the O-shaped sealing ring 106 to prevent fluid leakage at the connection between the two and ensure that all fluid flows through the buffer according to the preset path.

[0051] The O-ring 106 is made of elastic material. When the adapter 102 is connected to the rigid pipe 101, it will be squeezed by the two grooves to produce elastic deformation, fill the tiny gaps between the connecting surfaces, form a reliable sealing barrier, and prevent fluid from seeping out of the gaps.

[0052] When using a buffer:

[0053] S1. Receiving pulsed fluid:

[0054] The fluid inlet 103 receives pulsed fluid from the rubber tube at the outlet of the peristaltic pump. It is threadedly connected to the adapter 102 and can be replaced as needed to adapt to different connection scenarios, ensuring that the pulsed fluid enters the buffer stably.

[0055] S2. Guide fluid into rigid pipe 101:

[0056] The adapter 102 connects the fluid inlet 103 to the rigid pipe 101, guiding the pulsed fluid from the fluid inlet 103 into the rigid pipe 101. At the same time, the adapter 102 and the rigid pipe 101 are sealed together by the slot and the O-ring seal 106 to prevent fluid leakage and ensure that all fluid enters the rigid pipe 101.

[0057] S3. Suppress pulse:

[0058] The rigid tube 101 is a rigid structure that will not deform with the pulse. Its internal space is larger than that of the fluid inlet 103, providing a buffer area for the fluid and increasing the channel volume through which the fluid flows to weaken the pulse energy.

[0059] Furthermore, the rigid tube 101 is designed in a U-shape, which prolongs the flow path and residence time of the fluid in the tube, further enhancing the buffering effect on the pulse and allowing the pulse energy to gradually dissipate during the flow process.

[0060] S4. Outputs a smooth fluid:

[0061] After being buffered by the rigid pipe 101, the stable fluid is delivered to the flow outlet 104 through the adapter 102 at the other end. The connector 105 on the outside of the flow outlet 104 enhances the stability and sealing of the connection with the downstream pipeline, ensuring that the stable fluid is reliably delivered to subsequent equipment or systems.

[0062] In summary, when the pulsed gas enters the rigid tube 101 from the fluid inlet 103, the channel of the pulsed gas will suddenly increase, resulting in acoustic impedance mismatch.

[0063] Acoustic impedance (Z) is a physical quantity that describes the resistance of a medium to the propagation of sound waves. For a plane wave in a pipe, the acoustic impedance is defined as:

[0064]

[0065] in:

[0066] p is the density of the gas (air is approximately 1.2 kg / m³). 3 );

[0067] c is the speed of sound (approximately 340 m / s for air).

[0068] A is the cross-sectional area of ​​the pipe (A = π (d / 2)). 2 );

[0069] Acoustic impedance is inversely proportional to cross-sectional area A. Changes in pipe diameter will cause changes in impedance ratio, which in turn leads to the reflection and transmission of pressure waves.

[0070] Calculate the area ratio and impedance ratio:

[0071] Fluid inlet 103 area:

[0072]

[0073] Area of ​​rigid tube 101:

[0074]

[0075] Area ratio:

[0076]

[0077] Impedance ratio: (derived from the acoustic impedance formula: Z∝1 / A, where the p and c of the medium remain constant)

[0078]

[0079] When a pressure wave propagates from a medium with impedance Z1 to a medium with impedance Z2, the pressure transmission coefficient (T) p ) and reflection coefficient (R p )for:

[0080]

[0081] Most of the above formulas are basic physical formulas or formulas derived through conventional derivation, and belong to the scope of existing technology.

[0082] Therefore, based on the above formula, we can conclude that:

[0083] The pulsed gas contains rapidly changing pressure waves. At the point where the pipe diameter increases, the impedance mismatch filters out most of the pulsating energy (reflected back to the source), and only small, gradual changes enter the interior of the rigid tube 101.

[0084] A 90% duty cycle pulse means that the gas flow is intermittent, but this mechanism significantly reduces the peak amplitude of the pulsation, making the flow into the inlet of the rigid tube 101 smoother.

[0085] In this embodiment, by providing a buffer area for the fluid after the pulsed fluid is introduced into the rigid tube, the channel volume is increased to weaken the pulse energy, and the U-shaped rigid tube extends the fluid flow path and residence time, further enhancing the buffer and allowing the pulse energy to dissipate gradually, thereby ensuring that the fluid is smoothly delivered to subsequent equipment or systems.

[0086] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A buffer based on peristaltic pump pulse rejection, characterized in that, Include: The package shell (100); Hard pipe (101), the hard pipe (101) is arranged inside the package shell (100); Two adapter interfaces (102), two through slots are formed on the side of the package shell (100), two adapter interfaces (102) are respectively installed on the inner wall of the package shell (100) and are located inside the two through slots, two adapter interfaces (102) are in sealing connection with two openings of the hard pipe (101); Fluid inlet (103), the fluid inlet (103) is in threaded connection with one end of any adapter interface (102) extending outside the package shell (100); Flow outlet (104), the flow outlet (104) is in communication with one end of another adapter interface (102) extending outside the package shell (100).

2. A buffer based on peristaltic pump pulse rejection according to claim 1, characterized in that: The hard pipe (101) is arranged in U shape.

3. The buffer based on peristaltic pump pulse rejection of claim 1, wherein: The shape of the end of the fluid inlet (103) away from the package shell (100) is arranged in stepped shaft shape, and a plurality of coaxial cylindrical segments with decreasing diameters are sequentially arranged along the axial direction, and the adjacent cylindrical segments are connected by taper surface smooth transition.

4. The buffer based on peristaltic pump pulse rejection of claim 1, wherein: The flow outlet (104) is sleeved with a connecting piece (105) outside.

5. The buffer based on peristaltic pump pulse rejection of claim 1, wherein: The end of two adapter interfaces (102) abutting with the hard pipe (101) is provided with a clamping groove, and the inside of two clamping grooves on the same side is provided with an O-shaped sealing ring (106).

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