Diaphragm type pulse damper

Abstract

The utility model discloses a diaphragm type pulse damper which comprises a damper shell body, a liquid inlet, a liquid outlet and a diaphragm, a cavity is formed in the damper shell body, and at least one liquid inlet communicated with the cavity and at least one liquid outlet communicated with the cavity are formed in the outer side face of the damper shell body. The diaphragm piece is fixedly arranged in the damper shell, a cavity of the damper shell is divided into a damping liquid cavity and a fluid channel by the diaphragm piece, and the fluid channel is communicated with each liquid inlet and each liquid outlet; and the damping liquid is filled in the damping liquid cavity. The utility model has the advantages of simple structure, small volume, simplicity and convenience in installation and maintenance, capability of being used under high-pressure working conditions and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid conveying equipment, in particular to a diaphragm type pulse damper. Background Art

[0002] In the field of fluid transportation, with the technological upgrading of the industry, the requirements for the infusion accuracy and infusion pulse of infusion pumps are getting higher and higher. However, even a constant flow infusion pump will inevitably generate instantaneous flow fluctuations during operation. These instantaneous flow fluctuations will spread along the conveying pipeline and be manifested in the form of pulses, resulting in pulses in the entire conveying system and affecting the flow accuracy and stability of the infusion pump.

[0003] To overcome this problem, a pulse damper is usually installed downstream of the outlet end of the infusion pump to absorb or buffer the pulses in the pipeline and improve the infusion accuracy of the infusion pump. The principle of the pulse damper is to utilize the property that elastic substances can store energy when compressed. When the pressure of the fluid conveying system increases, the elastic substance is compressed and stores energy. When the pressure of the conveying system decreases, the elastic substance releases the stored energy, thereby achieving the purpose of balancing the system pressure and reducing the system pulse.

[0004] The pulse dampers used in the prior art are mainly airbag type pulse dampers. However, such airbag type pulse dampers have the following disadvantages:

[0005] 1. When the pressure of the conveying system is too high, due to the large compression coefficient of the gas, the airbag of the damper will be compressed beyond its deformation range in the face of high-pressure pulses, losing the function of buffering pulses. Therefore, the airbag type pulse damper can be used at a relatively low conveying pressure.

[0006] 2. Even if high-pressure gas is filled into the airbag type pulse damper so that it can be used under high-pressure working conditions, the high-pressure gas is prone to leakage, and the pressure needs to be released in time when not in use to prevent the airbag from being damaged.

[0007] 3. In order to provide sufficient pulse damping, the airbag type pulse damper usually needs to be designed with a large volume, which has relatively high requirements for the installation space.

[0008] Therefore, through beneficial exploration and research, the applicant has found a solution to the above problems, and the technical solution to be introduced below has been generated under this background. Summary of the Utility Model

[0009] The technical problem to be solved by the utility model is: to provide a diaphragm type pulse damper with a simple and reliable structure and capable of being used under high-pressure working conditions in view of the deficiencies of the prior art.

[0010] The technical problem to be solved by the utility model can be realized by adopting the following technical solutions:

[0011] A diaphragm type pulse damper, comprising:

[0012] A damper housing, within which a chamber is formed, and at least one liquid inlet communicating with the chamber and at least one liquid outlet communicating with the chamber are provided on an outer side surface of the damper housing;

[0013] A diaphragm fixedly arranged within the damper housing, which divides the chamber of the damper housing into a damping liquid chamber and a fluid passage, and the fluid passage communicates with each liquid inlet and each liquid outlet; and

[0014] Damping liquid filled within the damping liquid chamber.

[0015] In a preferred embodiment of the present utility model, the damper housing comprises a cylindrical housing with a bottom and an end cover, the end cover is detachably installed at an opening of the cylindrical housing, the diaphragm is located between the cylindrical housing and the end cover, a damping liquid chamber is formed by enclosing between one end face of the diaphragm and an inner peripheral surface of the cylindrical housing, a fluid passage is formed by enclosing between the other end face of the diaphragm and an inner side surface of the end cover, and each liquid inlet and each liquid outlet are provided on the end cover.

[0016] In a preferred embodiment of the present utility model, the end cover is fixed at the opening of the cylindrical housing by a plurality of fastening screws arranged at circumferential intervals.

[0017] In a preferred embodiment of the present utility model, an annular bracket is arranged between a peripheral edge of the opening of the cylindrical housing and the end cover, an inner sealing ring and an outer sealing ring are arranged on an end face of the annular bracket facing the end cover, the inner sealing ring is located inside the outer sealing ring, a peripheral edge of the diaphragm is embedded between the inner sealing ring and the outer sealing ring, and the diaphragm, the inner sealing ring and the outer sealing ring are compressed by the cylindrical housing, the end cover and the annular bracket to form a seal.

[0018] In a preferred embodiment of the present utility model, sintered filter sheets are respectively installed at each liquid inlet and each liquid outlet within the fluid passage.

[0019] In a preferred embodiment of the present utility model, the damping liquid is a compressible liquid.

[0020] In a preferred embodiment of the present utility model, the diaphragm is made of a flexible elastic material.

[0021] In a preferred embodiment of the present utility model, a base is further included, and the damper housing is horizontally and fixedly arranged on the base.

[0022] In a preferred embodiment of the present utility model, a damping fluid addition port communicating with the damping fluid chamber is provided on the outer side surface of the damper housing, and a plug is installed on the damping fluid addition port.

[0023] In a preferred embodiment of the present utility model, a pressure detection installation port communicating with the damping fluid chamber is provided on the outer side surface of the damper housing, and a pressure detection device is installed on the pressure detection installation port.

[0024] Due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows: The present utility model has the advantages of simple structure, small volume, convenient installation, maintenance and servicing, and can be used under high-pressure working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 is a three-dimensional structural schematic diagram of Embodiment 1 of the present utility model.

[0027] Figure 2 is a sectional view of Embodiment 1 of the present utility model.

[0028] Figure 3 is Figure 2 a partial enlarged schematic diagram at Location A of

[0029] Figure 4 is a structural schematic diagram of Embodiment 2 of the present utility model.

[0030] Figure 5 is a structural schematic diagram of Embodiment 3 of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below with reference to specific illustrations.

[0032] Embodiment 1

[0033] Refer to Figure 1 and Figure 2 , what is shown in the figure is a diaphragm type pulse damper, including a damper housing 100, a diaphragm 200, and a damping fluid 300.

[0034] A chamber is formed inside the damper housing 100. An inlet port 101 communicating with the chamber and an outlet port 102 communicating with the chamber are provided on the outer side surface of the damper housing. Of course, the number of the inlet port 101 and the outlet port 102 is not limited to that in this embodiment and should be set according to design requirements. The diaphragm 200 is fixedly arranged inside the damper housing 100. The diaphragm 200 divides the chamber of the damper housing 100 into a damping liquid chamber 103 and a fluid passage 104. The fluid passage 104 communicates with the inlet port 101 and the outlet port 102. The damping liquid 300 is filled in the damping liquid chamber 103 of the damper housing 100. In this embodiment, the damping liquid 300 is a compressible liquid, such as liquids like hydraulic oil, glycerol, silicone oil, methanol, and ethanol. The diaphragm 200 is made of a flexible elastic material, such as materials like PTFE, PVDF, PCTFE, and rubber.

[0035] In this embodiment, the damper housing 100 includes a cylindrical housing 110 with a bottom and an end cap 120. The end cap 120 is detachably and fixedly installed at the opening of the cylindrical housing 110 through a plurality of fastening screws 121 arranged at circumferential intervals.

[0036] The diaphragm 200 is located between the cylindrical housing 110 and the end cap 120. A damping liquid chamber 103 is formed by enclosing between one end face of the diaphragm 200 and the inner peripheral surface of the cylindrical housing 110. A fluid passage 104 is formed by enclosing between the other end face of the diaphragm 200 and the inner side surface of the end cap 120. At least a part of the fluid passage 104 is in contact with the other end face of the diaphragm 200. The inlet port 101 and the outlet port 102 are provided on the end cap 120 and communicate with the fluid passage 104.

[0037] See Figure 3 and in combination with Figure 2 , a ring bracket 130 is provided between the opening periphery of the cylindrical housing 110 and the end cap 120. An inner sealing ring 140 and an outer sealing ring 150 are provided on the end face of the ring bracket 130 facing the end cap 120. The inner sealing ring 140 is located inside the outer sealing ring 150. The periphery of the diaphragm 200 is embedded between the inner sealing ring 140 and the outer sealing ring 150. The diaphragm 200, the inner sealing ring 140, and the outer sealing ring 150 are squeezed by the cylindrical housing 110, the end cap 120, and the ring bracket 130 to form a seal, achieving the purpose of mutual sealing and improving the sealing performance of the overall structure.

[0038] Sintered filter sheets 160 are respectively installed at the inlet port 101 and the outlet port 102 in the fluid passage 104. The sintered filter sheets 160 can filter impurities in the transported fluid to prevent them from blocking the flow path or damaging the diaphragm 200.

[0039] The diaphragm type pulse damper of the present utility model further includes a base 400. The damper housing 100 is horizontally and fixedly arranged on the base 400, and the base 400 is fixedly connected to the damper housing 100 by means of threaded connection.

[0040] The working principle of the diaphragm type pulse damper of the present utility model is as follows:

[0041] Since the damping liquid chamber 103 of the damper housing 100 is filled with damping liquid 300, the damping liquid 300 is a compressible liquid, and the diaphragm 200 is made of a flexible elastic material, separating the damping liquid 300 from the fluid passage 104. When transporting fluid, the fluid enters the fluid passage 104 through the liquid inlet 101 and fills the fluid passage 104. Due to the back pressure of the transported fluid, the transported fluid causes the diaphragm 200 to undergo elastic deformation, forming a double buffering effect through the elasticity of the diaphragm 200 and the damping liquid 300 filled in the damping liquid chamber 103. When the pressure of the transported fluid increases, the diaphragm 200 and the damping liquid 300 are compressed and store energy. When the pressure of the transport system decreases, the diaphragm 200 and the damping liquid 300 release the stored energy again, thereby achieving the balance of the system pressure, absorbing the peaks and valleys of the transported fluid pulse, and greatly reducing the transported fluid pulse. Since the damping liquid 300 is a liquid, its compression coefficient is much smaller than that of a gas, which can well support the diaphragm 200 without being torn by the pressure, enabling the diaphragm type pulse damper of the present utility model to be used stably and reliably under high-pressure working conditions.

[0042] Embodiment 2

[0043] The diaphragm type pulse damper in this embodiment is substantially the same in structure as the diaphragm type pulse damper in Embodiment 1, and the difference lies in: Refer to Figure 4 , a damping liquid addition port 105a communicating with the damping liquid chamber 103a is provided on the outer side surface of the cylindrical housing 110a of the damper housing 100a, and a plug 106a is installed on the damping liquid addition port 105a. The damping liquid 300a can be filled or replaced through the damping liquid addition port 105a, making maintenance simple and convenient.

[0044] Embodiment 3

[0045] The diaphragm type pulse damper in this embodiment is substantially the same in structure as the diaphragm type pulse damper in Embodiment 2, and the difference lies in: Refer to Figure 5 , a pressure detection installation port 107b communicating with the damping liquid chamber 103b is provided on the outer side surface of the cylindrical housing 110b of the damper housing 100b, and a pressure detection device 108b is installed on the pressure detection installation port 107b. The pressure detection device 108b is fixedly installed by means of threaded connection. In this embodiment, the pressure detection device 108b can adopt a pressure sensor.

[0046] The pressure detection device 108b is not in direct contact with the conveyed fluid, and indirectly measures the pressure of the conveyed fluid through the diaphragm 200b and the damping liquid 300b, overcoming the defect that the existing pipeline pressure detection device is in direct contact with the conveyed fluid. The use process is clean and hygienic, and it is especially suitable for fields with high cleanliness requirements such as biomedicine and semiconductors, as well as working conditions of strongly corrosive fluids that the materials of the conveying pressure detection device cannot withstand.

[0047] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A diaphragm pulse damper, characterized in that: include: A damper housing, wherein a chamber is formed in the damper housing, and an outer surface of the damper housing is provided with at least one liquid inlet communicating with the chamber and at least one liquid outlet communicating with the chamber; a diaphragm fixedly disposed in the damper housing, the diaphragm dividing the chamber of the damper housing into a damping fluid chamber and a fluid channel, the fluid channel being in communication with each liquid inlet and each liquid outlet; and A damping fluid filled in the damping fluid chamber; The damper housing comprises a cylindrical housing with a bottom and an end cover, the end cover is detachably mounted at the opening of the cylindrical housing, the diaphragm is located between the cylindrical housing and the end cover, one end surface of the diaphragm and the inner circumferential surface of the cylindrical housing are enclosed to form the damping liquid chamber, the other end surface of the diaphragm and the inner side surface of the end cover are enclosed to form the fluid channel, and each liquid inlet and each liquid outlet are opened on the end cover; An annular bracket is provided between the opening periphery of the cylindrical shell and the end cover, an inner sealing ring and an outer sealing ring are provided on the end surface of the annular bracket facing the end cover, the inner sealing ring is located on the inner side of the outer sealing ring, the periphery of the diaphragm is embedded between the inner sealing ring and the outer sealing ring, and the diaphragm, the inner sealing ring and the outer sealing ring are squeezed by the cylindrical shell, the end cover and the annular bracket to form a seal; A sintered filter sheet is installed at each liquid inlet and each liquid outlet in the fluid channel.

2. The diaphragm type pulse damper according to claim 1, characterized in that: The end cover is fixed at the opening of the cylindrical shell by a plurality of fixing screws arranged at circumferential intervals.

3. The diaphragm type pulse damper according to claim 1, characterized in that: The damping fluid is a compressible liquid.

4. The diaphragm type pulse damper according to claim 1, characterized in that: The diaphragm is made of flexible elastic material.

5. The diaphragm type pulsation damper according to claim 1, characterized in that: It also includes a base, and the damper housing is horizontally fixed on the base.

6. The diaphragm type pulsation damper according to any one of claims 1 to 5, characterized in that A damping fluid adding port communicating with the damping fluid chamber is provided on the outer surface of the damper housing, and a plug is installed on the damping fluid adding port.

7. The diaphragm type pulsation damper according to claim 6, characterized in that: A pressure detection installation port communicating with the damping fluid chamber is provided on the outer surface of the damper housing, and a pressure detection device is installed on the pressure detection installation port.

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