CN211145752U

CN211145752U - Fluid conveying system and fluid pulse absorption device

Info

Publication number: CN211145752U
Application number: CN201920751839.7U
Authority: CN
Inventors: 孔桂昌
Original assignee: Hangzhou Jingjin Technology Co ltd
Current assignee: Hangzhou Jingjin Technology Co ltd
Priority date: 2019-05-07
Filing date: 2019-05-23
Publication date: 2020-07-31
Anticipated expiration: 2029-05-23
Also published as: CN210440751U

Abstract

The utility model discloses a fluid pulse absorption device, which comprises a shell, wherein a fluid expansion cavity is arranged in the shell; wherein a first elastic body is arranged in the fluid expansion cavity, and the first elastic body can generate elastic deformation to absorb the fluid pulse when being subjected to the fluid pulse within a preset first pressure threshold range; the fluid expansion cavity is also internally provided with a second elastic body which can generate elastic deformation to absorb the fluid pulse when being subjected to the fluid pulse exceeding the preset second pressure threshold range; the first elastomer is capable of producing a much greater amount of volumetric strain than the second elastomer. The utility model discloses a scheme has one or more advantages such as pulse absorption range is wide at least, elasticity fatigue life is long difficult inefficacy, acid and alkali corrosion resistance is good, small, with low costs.

Description

Fluid conveying system and fluid pulse absorption device

Technical Field

The utility model relates to a fluid transport technical field especially relates to a fluid conveying system and fluid pulse absorbing device.

Background

The fluid in the fluid conveying system has pulse during conveying, and especially for high pressure fluid, the pulse problem is especially serious. In order to solve the pulse problem, the prior art generally uses an air bag, a spring and the like as a pulse canceller, but the volume of the air bag is large, so that the pulse canceller is large in volume, inconvenient to place and high in cost; the spring is not corrosion-resistant and is not suitable for strong acid and strong alkali, and the elasticity of the spring has a fixed range, and the spring can lose efficacy when exceeding a certain range.

Therefore, there is a need to provide a technical solution to overcome the above-mentioned drawbacks of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough, and provide a fluid pulse absorption method among fluid pulse absorbing device, fluid conveying system and the fluid conveying pipeline, have one or more advantages such as the pulse absorption scope is wide at least, elasticity fatigue life length is difficult for becoming invalid, acid and alkali corrosion resistance can be good, small, with low costs.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a fluid pulse absorbing device comprises a housing, a fluid expansion chamber arranged in the housing; a first elastic body and a second elastic body which can eliminate pulses in the fluid in a grading way are arranged in the fluid expansion cavity;

wherein the first elastomer generates a volume strain amount to absorb the fluid pulse of the level when subjected to the fluid pulse within a preset first pressure threshold range, and the second elastomer generates a volume strain amount to absorb the fluid pulse of the level when subjected to the fluid pulse beyond a preset second pressure threshold range;

wherein the first elastomer has a greater modulus of elasticity than the second elastomer.

Further, the volume strain amount generated by the first elastic body is far larger than that generated by the second elastic body.

Further, the first elastic body is a metal corrugated pipe, and a closed inner cavity isolated from the fluid expansion cavity is formed in the middle of the first elastic body.

Further, the first elastic body is a cup-shaped metal corrugated pipe with a bottom opening, the mouth of the first elastic body is connected with the shell in a mounting mode, and a sealing piece for isolating the fluid expansion cavity is arranged at the mouth of the first elastic body.

Further, the second elastomer is a rubber elastomer.

Further, the second elastic body is a silicon rubber block or a silicon rubber ball.

Further, the second elastic body is a silicon rubber ball.

Further, the second elastic body is a plurality of rubber elastic bodies having different elastic moduli.

Furthermore, the second elastic body is positioned at the bottom of the first elastic body and is pressed against the first elastic body to generate pre-deformation.

Further, the fluid expansion cavity is a cylindrical cavity, and a gap for fluid to flow is formed between the first elastic body and/or the second elastic body and the inner cavity wall of the fluid expansion cavity.

Further, the housing has a fluid inlet and a fluid outlet communicating with the fluid expansion chamber.

Further, the surface of the first elastomer and/or the second elastomer is provided with a corrosion-resistant layer for isolating corrosive fluid.

The utility model also provides a fluid conveying system, it includes the fluid conveying pipeline, be connected with above-mentioned arbitrary technical scheme among the fluid conveying pipeline fluid pulse absorbing device.

Furthermore, the number of the fluid pulse absorbing devices is at least two, and the fluid pulse absorbing devices are connected in series.

The utility model provides a technical scheme has following technological effect at least:

1. the fluid pulse absorption device adopts the first elastic body and the second elastic body with different volume deformation amounts, the first elastic body plays a role in mainly absorbing pulses within a first preset pressure threshold range, when the second elastic body exceeds a second pressure threshold, the second elastic body plays a role in mainly absorbing pulses, and the volume deformation amount which can be generated by the first elastic body is far larger than the elastic deformation amount of the second elastic body, so that the first elastic body is more suitable for absorbing the fluid pulses with smaller pressure, and the second elastic body is more suitable for absorbing the fluid pulses with larger pressure, therefore, the utility model discloses a range for absorbing the fluid pulses is widened, the pulses with different frequency spectrums can be effectively eliminated, and the graded elimination of the pulses at first is also realized;

2. the utility model creatively combines the metal corrugated pipe and the elastic rubber piece together, and utilizes the elastic rubber piece to lead the metal corrugated pipe to generate certain predeformation, the elastic rubber piece can adopt a rubber block or a rubber ball, obviously, the elastic deformation quantity which can be generated by the metal corrugated pipe is far larger than that of the elastic rubber piece, and the elastic fatigue life of the metal corrugated pipe and the elastic rubber piece is longer and is not easy to lose efficacy; in addition, the surface of the first elastomer and/or the second elastomer which are not corrosion-resistant is coated with the corrosion-resistant layer for isolating corrosive fluid, so the corrosion resistance is good, and the elastomer can be suitable for more occasions, and of course, the utility model can also directly adopt corrosion-resistant materials to manufacture the first elastomer and the second elastomer;

3. compared with the traditional air bag structure, the fluid pulse suction device has small volume and low cost.

Drawings

Fig. 1 is a top view of a fluid pulse absorbing device according to the present invention.

Fig. 2 is a side view of a fluid pulse absorbing device of the present invention.

Fig. 3 is a cross-sectional view of the fluid pulse absorbing device of the present invention taken along line B-B of fig. 2.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic cross-sectional view of a fluid delivery system of the present invention.

Reference numerals:

100-a fluid pulse absorbing device; 101-a fluid inlet; 102-a fluid outlet; 110-a housing; 1101-a step portion; 1102-voids; 111-a first elastomer; 1110-sealing the lumen; 1111-mouth part; 112-a second elastomer; 113-a seal; 114-an inner cover; 115-outer cover; 10. 20-fluid delivery line.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 4, a fluid pulse absorbing device 100 includes a housing 110, a fluid expansion chamber is disposed in the housing 110; the fluid expansion cavity is provided with a first elastic body 111 and a second elastic body 112 which can eliminate pulses in the fluid in a grading way; in the present invention, the term "eliminating the impulse in the fluid at different levels" means that the first elastic body 111 and the second elastic body 112 can absorb or eliminate the impulse of the fluid at different pressure levels. In fact, the first elastomer 111 is mainly used to eliminate the fluid pulses of the low pressure stage, and the second elastomer 112 is mainly used to eliminate the fluid pulses of the high pressure stage.

Wherein the first elastic body 111 generates a volume strain amount to absorb the fluid pulse of the level when subjected to the fluid pulse within a preset first pressure threshold range, and the second elastic body 112 generates a volume strain amount to absorb the fluid pulse of the level when subjected to the fluid pulse beyond a preset second pressure threshold range;

wherein the elastic modulus of the first elastic body 111 is greater than that of the second elastic body 112. And the volume strain amount generated by the first elastic body 111 is far larger than that generated by the second elastic body 112.

Generally, when an external force is applied to an elastic body, the elastic body will change its shape (called "deformation"), and the "elastic modulus" is generally defined as: the stress in the unidirectional stress state is divided by the strain in that direction. For a metal bellows, the unidirectional stress is applied along the central axis thereof, for an elastic rubber block, the unidirectional stress is applied along the thickness thereof, and for an elastic rubber ball, the unidirectional stress is applied in either direction. In the elastic deformation stage of the material, the stress and the strain are in a proportional relation (namely, the material conforms to Hooke's law), and the proportionality coefficient of the material is called elastic modulus. The unit of the elastic modulus is dynes per square centimeter. "elastic modulus" is a physical quantity describing the elasticity of a substance, and is a general term indicating that the method may be "young's modulus", "bulk modulus", or the like.

In addition, an overall pressure p is applied to the elastic body, this pressure is called "volume stress", and the volume reduction amount of the elastic body is called "volume strain amount", that is, in the elastic strain range of the present invention, when the first elastic body 111 and the second elastic body 112 are subjected to the same volume stress, the volume strain amount of the first elastic body 111 is much larger than that of the second elastic body 112. The volume strain can also be expressed in terms of elastic deformation.

In this embodiment, the second pressure threshold is greater than the first pressure threshold, but in other embodiments, the second pressure threshold may be slightly smaller than or equal to the first pressure threshold, which may satisfy the requirement of the present invention for absorbing the pulse in the fluid in stages.

The actual magnitudes of the first pressure threshold and the second pressure threshold are determined by the elastic modulus, the volume strain, the deformation limit of the first elastic body 111 and the second elastic body 112, and other factors, neither the first pressure threshold value nor the second pressure threshold value can be defined by a specific value, which in practice can be designed empirically according to the actual needs, for example, when the pressure of the transported fluid is 1Mpa, we need to further test the range of the pulse pressure generated in the fluid at that pressure, then, the sizes of the first pressure threshold value and the second pressure threshold value are determined according to the pulse pressure range, after the first pressure threshold value and the second pressure threshold value are determined, the elastic modulus and other parameters of the first elastic body and the second elastic body are further designed, and finally a reasonable and adaptive parameter value range is obtained through repeated experiments. Thus, the first pressure threshold and the second pressure threshold in the present invention need to be set specifically according to the actual requirement of absorbing the pulse, but for the determined first elastic body or the determined second elastic body, the preset first pressure threshold and the preset second pressure threshold are determined. When there are a plurality of first elastic bodies, the maximum pressure value at which they can absorb pulses in combination is the first pressure threshold value. When there are a plurality of second elastic bodies, the minimum pressure value at which they can absorb pulses in combination is the second pressure threshold value.

Specifically, the housing 110 is provided with a fluid inlet 101, a fluid outlet 102 and a fluid expansion cavity, the fluid inlet 101, the fluid outlet 102 and the fluid expansion cavity are communicated, the first elastic body 111 and the second elastic body 112 are disposed in the fluid expansion cavity, the second elastic body 112 is located at the bottom of the first elastic body 111, the second elastic body 112 presses against the first elastic body 111 to generate pre-deformation, that is, the first elastic body 111 is located above the second elastic body 112 to support the first elastic body 111, and in an initial state, the first elastic body 111 is pressed by the second elastic body 112 to have a certain pre-compression deformation, which is to improve the temporary response efficiency of the metal bellows in the harmful pulse, so as to avoid that the response of the metal bellows to the harmful pulse with a large pressure is missed due to an excessively long deformation time in a low-pressure stage.

Referring to fig. 4, as a preferred structure, the fluid expansion cavity is a cylindrical cavity, and a gap 1102 for fluid to flow is provided between the first elastic body 111 and the second elastic body 112 and an inner cavity wall of the fluid expansion cavity, that is, a gap 1102 for fluid to flow is provided between the first elastic body 111 and the second elastic body 112 and the fluid expansion cavity, but in this embodiment, the sizes of the gaps 1102 between the first elastic body 111 and the inner wall and the second elastic body 112 are different. In practice, however, in this embodiment, the first elastic body 111 and the second elastic body 112 have a gap between the inner cavity wall of the fluid expansion cavity for fluid to flow,

referring to fig. 3, in the present embodiment, the first elastic body 111 is a metal bellows, which is a cup-shaped metal bellows with an open bottom, and has a closed inner cavity 1110 at the middle part thereof, which is isolated from the fluid expansion cavity. The mouth 1111 of the metal corrugated pipe is connected with the shell 110 in an installing mode, a flanging is arranged at the mouth 1111, and a sealing element 113 used for isolating a fluid expansion cavity is sleeved on the inner side of the flanging. A step 1101 is arranged at the port of the shell 110, and the sealing member 113 is pressed between the flanging of the mouth 1111 of the metal corrugated pipe and the step 1101 of the shell 110.

For the present invention, the second elastic body 112 is a rubber elastic body; preferably, the second elastic body 112 is a silicone rubber block or a silicone rubber ball; more preferably, the second elastic body 112 is a silicone rubber ball. In this embodiment, the second elastic body 112 is made of a silicone rubber block, in other embodiments, in order to further improve the pulse absorption effect, 3 silicone rubber balls with different elastic moduli may be further provided to adapt to the pulse elimination in a wider pressure range, and on the premise that the materials are the same, the elastic modulus difference generally means that the hardness of the silicone rubber is different, for example, the rockwell hardness of the 3 silicone rubber balls is 30 degrees, 50 degrees and 70 degrees respectively.

In order to improve the weather resistance, especially the acid and alkali resistance, of the first elastic body 111 and the second elastic body 112, the outer surface of the first elastic body 111 is coated with a corrosion-resistant layer in this embodiment, the corrosion-resistant layer may be made of a material resistant to corrosion by strong acid and strong alkali, such as FEP, PFA, or PTFE, and in this embodiment, the corrosion-resistant layer is made of FEP material. Of course, in other embodiments, the second elastic body 112 may be made of corrosion-resistant elastic rubber directly, and the corrosion resistance of the first elastic body 111 may be increased by using corrosion-resistant elastic metal or coating the metal surface with other coatings.

Referring to fig. 3, an inner cover 114 is further disposed outside the mouth 1111 of the first elastic body 111 to further enhance the sealing effect, an outer cover 115 is disposed outside the inner cover 114, and the outer cover 115 and the housing 110 are both fixed to achieve the installation of the entire fluid pulse absorbing device 100. The outer cover 115 and the housing 110 are preferably mounted in a threaded connection.

In the technical scheme of the utility model, first elastomer 111 and second elastomer 112 both can play the effect of elastic energy storage for absorb fluid pulse. The elastic deformation of the first elastic body 111 and the elastic deformation of the second elastic body 112 are different, so that the fluid pulses with different pressure thresholds can be absorbed, the first elastic body 111 adopts a corrugated pipe, the second elastic body 112 adopts a rubber elastic body, the elastic deformation of the first elastic body 111 is far larger than that of the second elastic body 112, and the pulse absorption range is wide. The first elastic body 111 may also be a rubber corrugated tube, for example, the first elastic body 111 and the second elastic body 112 are made of materials such as FEP, PFA, PTFE, etc. that is resistant to acid and alkali corrosion, and have a small volume and are not easy to fail. The second elastic body 112 may be spherical, cylindrical, square, annular, elongated, etc. As a modified example, it is also possible to seal an elastic energy storage material such as rubber by means of a flange using a PFA film and fit it into the flow path.

During the operation of the fluid, the fluid flowing from the fluid inlet 101 enters the fluid expansion cavity, and when the pressure of the fluid is increased, the first elastic body 111 and the second elastic body 112 are sequentially compressed and deformed to absorb the pulse; the first elastic body 111 and the second elastic body 112 can rebound under low pressure or no pressure, so that the continuous and uninterrupted delivery of the fluid from the fluid outlet 102 is realized, and finally, the smooth flow of the fluid is realized, and the purposes of convenient metering and the like are achieved.

Referring to fig. 5, the present invention further provides a fluid delivery system, which includes

fluid delivery pipes

10 and 20, the

fluid delivery pipes

10 and 20 are respectively connected to a fluid inlet 101 and a fluid outlet 102 of a fluid pulse absorbing device 100, so as to connect the fluid pulse absorbing device 100 to the fluid delivery system. In one embodiment, the fluid delivery system may be a hydraulic pump, for example, a plunger pump. The utility model provides a fluid conveying system, owing to adopted above technical scheme fluid pulse absorbing device 100, the beneficial effect that it has can be referred to above, no longer repeated here.

It should be noted that, in a specific application, a plurality of fluid pulse absorbing devices may be disposed in the fluid conveying pipeline and connected in series. In addition, in order to better achieve the staged elimination of the pulses, a plurality of fluid pulse absorbing devices may also be preset with different first and second pressure thresholds, and different fluid pulse absorbing devices may absorb different ranges of fluid pulses.

The utility model also provides a fluid pulse absorption method in the fluid conveying pipeline, wherein be connected with in the fluid pulse pipeline fluid pulse absorbing device 100 sets up in the fluid inflation chamber in this pulse absorbing device 100: a first elastic body 111 elastically deforming to absorb a fluid pulse within a preset first pressure threshold range when subjected to the fluid pulse; a second elastic body 112 which elastically deforms to absorb a fluid pulse exceeding a preset second pressure threshold range when subjected to the fluid pulse; the first elastic body 111 is elastically deformed by a much larger amount than the second elastic body 112. Further, the first elastic body 111 is a metal corrugated pipe, and the second elastic body 112 is a rubber elastic body; the second elastic body 112 presses against the bottom of the first elastic body 111 to pre-deform the same.

It should be noted that, the volume strain amount generated by the first elastic body 111 is much larger than the volume strain amount of the second elastic body 112, which means that the volume strain amount of the first elastic body 111 is much larger than the volume strain amount of the second elastic body 112 in the elastic strain range of the two elastic bodies, but the volume strain amount is far larger than the volume strain amount generated by the second elastic body 112, but the volume strain amount is not limited by an absolute value, but can be determined qualitatively. The main purpose of this arrangement is that the first elastic body 111 has a more sensitive response capability to fluid pulses with lower pressure, whereas the second elastic body 112 has a more sensitive response capability to fluid pulses with higher pressure, in particular when the elastic deformation of the first elastic body 111 exceeds a limit value, i.e. the first elastic body 111 has a higher response sensitivity at low pressure, whereas the second elastic body 112 has a higher response sensitivity at high pressure. Moreover, in the present invention, the first elastomer 111 will eliminate a greater proportion or range of fluid pulses than the second elastomer 112 within the range of pulse pressures that may be generated in the fluid, while the second elastomer 112 will primarily play a positive role in the high pressure range.

The technical solution of the present invention can be clearly understood from the above description, the present invention discloses a fluid pulse absorption device, a fluid delivery system and a fluid pulse absorption method in a fluid delivery pipeline, which adopts a first elastic body and a second elastic body with different volume strain quantities, can absorb fluid pulses with different pressure threshold values, and has a wide pulse absorption range; the first elastic body and the second elastic body adopt corrugated pipes and rubber pieces, so that the elastic fatigue life is long, and the failure is not easy to occur; the rubber part has good acid and alkali corrosion resistance; compared with the traditional air bag structure, the fluid pulse suction device has small volume and low cost.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A fluid pulse absorbing device comprises a housing, a fluid expansion chamber arranged in the housing; the fluid expansion cavity is internally provided with a first elastic body and a second elastic body which can eliminate pulses in the fluid in a grading way;

2. The fluid pulse absorber of claim 1, wherein the first elastomer produces a much greater amount of volumetric strain than the second elastomer.

3. The fluid pulse absorber of claim 2, wherein the first elastomer is a metal bellows having a closed inner cavity in a middle portion thereof isolated from the fluid expansion chamber.

4. The fluid pulse absorber according to claim 3, wherein the first elastic body is a cup-shaped metal bellows with a bottom opening, a mouth of the cup-shaped metal bellows is connected with the housing, and a sealing member for isolating the fluid expansion chamber is provided at the mouth of the cup-shaped metal bellows.

5. The fluid pulse absorbing device according to claim 1, 2, 3 or 4, wherein the second elastomer is a rubber elastomer.

6. The fluid pulse absorber of claim 5, wherein the second elastomer is a silicone rubber block or a silicone rubber ball.

7. The fluid pulse absorber of claim 5, wherein the second elastomer is a silicone rubber ball.

8. The fluid pulse absorber of claim 5, wherein the second elastomer is a plurality of rubber elastomers having different elastic moduli.

9. The fluid pulse absorber of claim 5, wherein the second resilient body is located at the bottom of the first resilient body and is pre-deformed by pressing against the first resilient body.

10. The fluid pulse absorber of claim 1, wherein the fluid expansion chamber is a cylindrical chamber, and a gap for fluid flow is provided between the first elastomer and/or the second elastomer and the inner chamber wall of the fluid expansion chamber.

11. The fluid pulse absorbing device according to claim 10, wherein the housing has a fluid inlet and a fluid outlet communicating with the fluid expansion chamber.

12. A fluid pulse absorber according to claim 1, wherein the surface of the first elastomer and/or the second elastomer has a corrosion resistant layer that insulates against corrosive fluids.

13. A fluid transfer system comprising a fluid transfer line, wherein at least one fluid pulse absorbing device according to any one of claims 1 to 12 is connected to the fluid transfer line.

14. The fluid delivery system of claim 13, wherein said fluid pulse absorbing means are at least two and are connected in series.