CN110985885B - Conveying device with passively regulated flow - Google Patents
Conveying device with passively regulated flow Download PDFInfo
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- CN110985885B CN110985885B CN201911326766.8A CN201911326766A CN110985885B CN 110985885 B CN110985885 B CN 110985885B CN 201911326766 A CN201911326766 A CN 201911326766A CN 110985885 B CN110985885 B CN 110985885B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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Abstract
The invention discloses a conveying device for passively adjusting flow, which comprises a pipeline, wherein an annular opening is formed in the inner wall of the pipeline; the device also comprises a transmission mechanism, wherein the transmission mechanism comprises an annular active cavity, a passive cavity and a connecting channel for communicating the annular active cavity and the passive cavity, the annular active cavity, the passive cavity and the connecting channel are filled with flowing media, and the inner side wall of the annular active cavity is an extrusion deformation sheet and closes an annular opening; the device also comprises a quantity adjusting assembly, the transmission mechanism comprises a moving part and a plugging cylinder, the plugging cylinder is plugged at the position, located at the downstream of the extrusion deformation sheet, in the pipeline, a plurality of flow holes are formed in the plugging cylinder, and the moving part is movably connected to the plugging cylinder; the passive cavity is provided with an elastic telescopic part, and the extrusion stroke of the extrusion deformation sheet drives the moving part to shield the circulation hole. The conveying device with passively regulated flow, provided by the invention, passively regulates pulse liquid flow or air flow through the transmission mechanism, and obtains relatively constant flow speed and flow.
Description
Technical Field
The invention relates to the fluid and gas conveying technology, in particular to a conveying device with passively regulated flow
Background
The liquid or gas is transported through pipelines almost exists in various industries, generally speaking, the liquid transportation process needs to be controlled to keep constant flow rate, the flow rate control in the prior art comprises manual control and automatic control, wherein the manual control is used for controlling the opening amplitude of a mechanical valve to realize flow rate control, the automatic control generally comprises a sensor, a control module, a man-machine interaction module and an automatic control valve, the sensor detects the flow rate or the flow velocity of the liquid in the pipeline, and the control module controls the opening amplitude of the automatic control valve according to the data detected by the sensor, so that the automatic control of the flow rate or the flow velocity is realized.
In the prior art, as disclosed by CN202083670U, the publication date is 2011, 11/21, entitled "a gas flow rate automatic control device for ion mobility spectrometer", which includes a gas flow rate sensor for measuring the gas flow rate and converting and outputting a corresponding gas flow rate electric signal, a data acquisition and processing device for acquiring the converted gas flow rate electric signal and processing a post-output control signal, and a gas flow rate control device for controlling the gas flow rate through the control signal, wherein the gas flow rate sensor is connected with the input end of the data acquisition and processing device, and the output end of the data acquisition and processing device is connected with the gas flow rate control device. The utility model discloses at first measure the gas velocity of flow and convert the corresponding gas velocity of flow signal of output through gas velocity of flow sensor, then carry out the AD conversion, after the low pass filtration, calculate and obtain corresponding control value and export corresponding control signal, gas velocity of flow sensor controls it at corresponding aperture through this control signal to the gas velocity of flow in the accurate control gas circuit.
The prior art has the disadvantages that manual control cannot realize accurate and timely adjustment, automatic control has three defects, one of which needs to arrange a circuit, which has difficulty in partial fields such as temporary irrigation of large-scale farmlands and difficulty in arranging the circuit, the other one has more electrical elements and higher cost, and the third one has the overall concept that the flow or the flow rate is monitored to control the opening amplitude of a water inlet valve, so that the flow rate and the flow are controlled In the control mode, the pulse already exists when the control is performed, and the control mode has a hysteresis effect, so that the pulse change cannot be completely eliminated.
Disclosure of Invention
The invention aims to provide a conveying device for passively adjusting flow, which aims to overcome the defects in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
a conveying device for passively adjusting flow comprises a pipeline, wherein an annular opening is formed in the inner wall of the pipeline;
the device also comprises a transmission mechanism, wherein the transmission mechanism comprises an annular active cavity, a passive cavity and a connecting channel for communicating the annular active cavity and the passive cavity, flowing media are filled in the annular active cavity, the passive cavity and the connecting channel, and the inner side wall of the annular active cavity is an extrusion deformation sheet and closes the annular opening;
the device also comprises a quantity adjusting assembly, the transmission mechanism comprises a moving part and a plugging cylinder, the plugging cylinder is plugged in the pipeline at the position located at the downstream of the extrusion deformation sheet, a plurality of flow holes are formed in the plugging cylinder, and the moving part is movably connected to the plugging cylinder;
the passive cavity is provided with an elastic telescopic part which drives the moving part, and the extruded stroke of the extrusion deformation sheet drives the moving part to shield the circulation hole.
In the conveying device for passively adjusting the flow, the annular active cavity, the passive cavity and the connecting channel are of an integrated structure.
In the above conveying device with passively regulated flow, the flowing medium is hydraulic oil.
The conveying device for passively adjusting the flow further comprises a fine adjustment assembly, wherein the fine adjustment assembly comprises a handle, a connecting rod and a piston which are sequentially connected, the piston is movably connected in the adjusting chamber, and the connecting rod is movably connected to the active cavity in a sealing mode.
In the above conveying device for passively adjusting the flow rate, the extrusion deformation sheet is an elastic metal sheet or a flexible deformation sheet.
The conveying device with the passively regulated flow further comprises a shell, an accommodating cavity is formed between the shell and the outer wall of the pipeline, and the transmission mechanism is located in the accommodating cavity.
The conveying device for passively adjusting the flow is characterized in that a driving hole is formed in the passive cavity, the elastic expansion part is located in the driving hole, a driving rod is arranged at one end of the moving part, and the driving rod is movably connected in the driving hole and connected with the elastic expansion part.
According to the conveying device for passively adjusting the flow, the plugging cylinder is further provided with the normally through hole, and the moving stroke of the moving part does not cover the normally through hole.
In the above conveying device for passively adjusting the flow rate, the flow hole is a rectangular hole, and the moving stroke of the moving element is from one side of the rectangular hole to the other side of the rectangular hole.
In the technical scheme, in the conveying device for passively regulating flow, the upstream water flow drives the extrusion deformation sheet, the downstream regulating assembly realizes the regulation of flow through the transmission mechanism, so that the synchronous and even advanced regulation is realized, the pulse liquid flow or air flow is passively regulated through the transmission mechanism, and the relatively constant flow speed and flow are obtained.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a conveying device with passively regulated flow according to an embodiment of the present invention in a first state;
fig. 2 is a schematic structural diagram of a conveying device with passively regulated flow according to an embodiment of the present invention in a second state;
FIG. 3 is a schematic structural view of an occlusion cartridge provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a moving element according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a plugging cylinder and a moving part in a first state according to an embodiment of the invention;
FIG. 6 is a schematic structural view of a plugging cylinder and a moving part in a first state according to an embodiment of the invention;
FIG. 7 is a schematic structural diagram of a passively flow-regulated delivery device according to another embodiment of the present invention in a first state;
FIG. 8 is a schematic structural view of a plugging cylinder and a moving part in a first state according to another embodiment of the invention;
FIG. 9 is a schematic structural view of a plugging cylinder and a moving part in a first state according to another embodiment of the invention;
fig. 10 is a schematic structural view of a ring-shaped elastic thread and a ring-shaped elastic thread according to an embodiment of the present invention.
Description of reference numerals:
1. a pipeline; 2. an annular active cavity; 2.1, extruding the deformation sheet; 3. a passive cavity; 3.1, an elastic expansion part; 4. a connecting channel; 5. a handle; 6. a connecting rod; 7. a piston; 8. a conditioning chamber; 9. a support bar; 9.1, accommodating cavities; 10. an annular elastic thread; 11. a moving member; 11.1, a driving rod; 12. a plugging cylinder; 12.1, flow holes; 12.2, a normally open hole; 13. an elastic telescopic structure; 14. a spring; 15. a housing.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
In the embodiments of the present invention, the upstream and the downstream are relative to the flow direction of the fluid or the gas, the flow direction of the fluid or the gas is from the upstream to the downstream, and the inner and the outer are relative to the pipe 1, such as the inner wall and the outer wall of the pipe 1. The intermediate device provided by the invention is mainly used for regulating the pulse liquid flow or the gas flow, can be used independently, and can also be used together with a flow speed or flow regulating device in the prior art such as an automatic regulating valve, so that a better technical effect is obtained.
As shown in fig. 1 to 10, a conveying device for passively adjusting a flow rate according to an embodiment of the present invention includes a pipeline 1, wherein an annular opening is disposed on an inner wall of the pipeline 1; the device is characterized by further comprising a transmission mechanism, wherein the transmission mechanism comprises an annular active cavity 2, a passive cavity 3 and a connecting channel 4 for communicating the annular active cavity 2 with the passive cavity 3, flowing media are filled in the annular active cavity 2, the passive cavity 3 and the connecting channel 4, the inner side wall of the annular active cavity 2 is an extrusion deformation sheet 2.1 and closes the annular opening; the device also comprises a quantity adjusting assembly, the transmission mechanism comprises a moving part 11 and a plugging cylinder 12, the plugging cylinder 12 is plugged at the position, located at the downstream of the extrusion deformation sheet 2.1, in the pipeline 1, the plugging cylinder 12 is provided with a plurality of flow holes 12.1, and the moving part 11 is movably connected to the plugging cylinder 12; the passive cavity 3 is provided with an elastic telescopic part 3.1, the elastic telescopic part 3.1 drives the moving part 11, and the extruded stroke of the extrusion deformation sheet 2.1 drives the moving part 11 to shield the circulation hole 12.1.
Specifically, the conveying device provided in this embodiment is used for being connected to a conveying pipeline 1 for gas or liquid to provide a passive adjusting device for flow rate or flow rate, the main body of the conveying device is a pipeline 1, one end of the pipeline 1 is a feeding port, the other end of the pipeline 1 is a discharging port, an annular opening is formed in the inner wall of the pipeline 1, the annular opening is sealed by a compression deformation sheet 2.1, the compression deformation sheet 2.1 is hermetically connected to the annular opening of the pipeline 1, if the edge portion of the compression deformation sheet is hermetically bonded to the pipe wall of a transmission port, that is, the gas or liquid in the pipeline 1 cannot leak through the annular opening, but obviously, the liquid or gas flowing in the pipeline 1 can apply a radially outward extrusion force to the compression deformation sheet 2.1, the compression deformation sheet 2.1 is a sheet material which can deform after being extruded, such as an elastic metal sheet or a flexible deformation sheet, the elastic metal sheet such as a corrugated thin steel sheet can deform after being extruded, flexible deformable sheets such as plastic sheets, cloth sheets, rubber sheets, etc. are also deformed after being pressed.
In this embodiment, the extrusion deformation sheet 2.1 is an inner wall plate of the annular active cavity 2, the annular active cavity 2 is connected to the passive cavity 3 through the connecting channel 4, the annular active cavity 2, the passive cavity 3 and the connecting channel 4 are filled with flowing medium, preferably hydraulic oil, the passive cavity 3 is provided with an elastic expansion part 3.1, the elastic expansion part 3.1 is similar to the extrusion deformation sheet 2.1, and is a material capable of elastically expanding and contracting after being extruded, such as elastic plastic or rubber material, rubber sheet or rubber bag capable of elastically contracting and expanding, and the like, so that when the annular elastic sheet is pressurized and deformed inwards, the flowing medium flows in the annular active cavity 2, the passive cavity 3 and the connecting channel 4, and the elastic expansion part 3.1 at the other end is forced to expand and contract, such as a cylindrical rubber bag, and becomes long or thick along with the filling of the flowing medium, this completes the actuation of the resilient bellows 3.1 by the fluid compression in the conduit 1.
In this embodiment, the plugging cylinder 12 is disposed downstream of the crush deformation sheet 2.1 in the pipeline 1, and covers a radial cross section of the pipeline 1, for example, it is a cylindrical structure, and it is internally sleeved on an inner wall of the pipeline 1, and even may be an integrated structure with the pipeline 1, the plugging cylinder 12 is provided with a plurality of flow holes 12.1, and the flow holes 12.1 are used for allowing liquid or gas in the pipeline 1 to flow through, and move from one side of the plugging cylinder 12 to the other side; the moving member 11 is movably connected and attached to the plugging cylinder 12, the moving member 11 is driven by the elastic expansion part 3.1, that is, the expansion stroke of the elastic expansion part 3.1 drives the moving member 11 to move, and the moving member 11 moves to shield the flow through hole 12.1 on the plugging cylinder 12, so that the adjustment of the flow is realized, preferably, as shown in fig. 1-6, the moving member 11 is provided with a structure through which gas and liquid can pass, such as a through hole or a gap, and the like, and in one state, as shown in fig. 1 and 5, the through hole on the moving member 11 is overlapped with the flow through hole 12.1, at this time, the gas and the liquid can pass through the flow through hole 12.1 smoothly, and in the other state, as shown in fig. 2 and 6, the moving member 11 at least partially shields the flow through hole 12.1, at this time, the gas and the liquid cannot pass through the flow through hole 12.1 smoothly, and the flow rate is adjusted.
In this case, it is preferable that the flow holes 12.1 are rectangular holes and the movement of the moving element 11 is from one side of the rectangular hole to the other side, so that a uniform adjustment is achieved, with the same movement closing the openings of the same proportion.
The conveying device provided by the embodiment of the invention is in the first state under the state of normal flow velocity, for example, the normal flow velocity is 1m/s, that is, as shown in fig. 1/5/7, the state of the crush deformation pieces 2.1, the transmission mechanism, the moving element 11 and the plugging cylinder 12 is such that the pipe body can pass the maximum flow, that is, each flow hole 12.1 of the plugging cylinder 12 is not limited, preferably, the crush deformation pieces 2.1 are not deformed, and then, when the flow velocity becomes larger, such as gradually changing to 1.5m/s, the larger flow velocity impacts and extrudes the deformation sheet 2.1 to deform the deformation sheet, thus driving the transmission mechanism and the moving piece 11, the moving piece 11 moves on the plugging cylinder 12 to gradually close the flow hole 12.1, the flow is regulated in such a way that the greater the flow rate, the more the pressure deformation sheet 2.1 is pressed and the greater the area of the flow opening 12.1 that is closed. That is, the pressing process of the crush lobes 2.1 drives the moving member 11 to close the flow opening 12.1.
According to the conveying device for passively adjusting the flow, provided by the embodiment of the invention, the upstream water flow drives the extrusion deformation sheet 2.1, the downstream adjusting component realizes the adjustment of the flow through the transmission mechanism, so that the synchronous and even advanced adjustment is realized, the pulse liquid flow or air flow is passively adjusted through the transmission mechanism, and the relatively constant flow speed and flow are obtained.
In another embodiment provided by the embodiment of the present invention, preferably, a driving hole is formed in the passive cavity 3, the elastic expansion portion 3.1 is located in the driving hole, a driving rod 11.1 is disposed at one end of the moving member 11, the driving rod 11.1 is movably connected to the driving hole and connected to the elastic expansion portion 3.1, and the driving hole is used for limiting the elastic expansion portion 3.1 and the driving rod 11.1, so that on one hand, the elastic expansion portion 3.1 can only expand and contract in the driving hole to lengthen or shorten, and the driving rod 11.1 can only reciprocate in the driving hole, thereby achieving convenience of transmission and guidance and convenience of limiting.
In another embodiment provided by the embodiment of the present invention, preferably, the annular active cavity 2, the passive cavity 3, and the connecting channel 4 are an integrated structure, and for example, the transmission mechanism includes an integrated housing, two cavities and a channel connecting the two cavities are formed inside the housing, and the two cavities are respectively provided with the crush deformation sheet 2.1 and the elastic expansion portion 3.1, which is advantageous in that the integrated structure is convenient to arrange and reduces the probability of leakage.
In still another embodiment provided by the embodiment of the present invention, further, the present invention further includes a fine adjustment assembly, the fine adjustment assembly includes a handle 5, a connecting rod 6 and a piston 7, which are connected in sequence, the piston 7 is movably connected in the adjustment chamber 8, the connecting rod 6 is movably connected to the active cavity in a sealing manner, obviously, the movement of the piston 7 will extrude the flowing medium, which substantially adjusts the internal volume of the transmission mechanism, that is, adjusts the extrusion degree of the flowing medium to the extrusion deformation sheet 2.1 and the elastic expansion portion 3.1, that is, adjusts the initial position of the moving member 11, that is, adjusts the movement amplitude of the moving member 11 at the same flow rate.
In a further embodiment provided by the embodiment of the present invention, preferably, the present invention further includes an outer casing 15, an accommodating cavity 9.1 is formed between the outer casing 15 and an outer wall of the pipeline 1, the transmission mechanism is located in the accommodating cavity 9.1, and the transmission mechanism is better protected by the outer casing 15 to be disposed in an exposed environment.
In still another embodiment provided by the embodiment of the present invention, further, a normally through hole 12.2 is further provided on the plugging cylinder 12, and the moving stroke of the moving element 11 does not cover the normally through hole 12.2. I.e. the through-holes 12.2 remain normally open under all conditions, thus preventing the moving element 11 from completely closing the passage, causing the liquid or gas to be unable to pass through.
In each embodiment of the invention, the main resistance in the transmission process is the friction force between the moving piece 11 and the plugging cylinder 12, and a roller can be arranged between the moving piece and the plugging cylinder to reduce the resistance through rolling.
In still another embodiment provided by the embodiment of the present invention, as shown in fig. 7-9, the moving element 11 is also an elastic telescopic structure 13, and the inside is directly communicated with the elastic telescopic portion 3.1, the expansion of the elastic telescopic portion 3.1 can make the moving element 11 synchronously expand and contract, for example, the moving element 11 is a flat elastic telescopic bag, the diameter of the flat elastic telescopic bag is 1cm in the contraction state, and the diameter of the flat elastic telescopic bag can reach 2cm in the expansion state, and the inside is communicated with the elastic telescopic bag, so that the flowing medium flows into the elastic telescopic bag after the extrusion deformation sheet 2.1 is extruded, the elastic telescopic bag expands from 1cm to 2cm in diameter, and the process is performed in the flow through hole 12.1, so that the flow area of the flow through hole 12.1 is reduced, which is advantageous in that the whole process has almost no mechanical transmission structure and very small resistance.
Still further, when the moving member 11 is an elastic telescopic structure 13, a spring 14 is disposed inside the moving member, and in an initial state, that is, when the elastic sheet is not deformed, the spring 14 and the elastic telescopic structure 13 are both in a deformed state, that is, the elastic telescopic structure 13 stretches and contracts to drive the spring 14 to deform, so that on one hand, the spring 14 can provide a restoring force, and on the other hand, the elastic force, the pressure of the flowing medium and the liquid flow in the pipe 1 form a balance on the surface of the elastic telescopic structure 13, so that the pressure of the flowing medium and the liquid flow in the pipe 1 make the pressing deformation sheet 2.1 sensitive to the change of the flow velocity with a small speed, and the response is quicker, for example, the initial deformation resistance of the elastic telescopic structure 13 is 3N, and the pressure of the flowing medium in the initial state is only 1N, so that the pressing deformation sheet 2.1 is at least subjected to a pressure, when the spring 14 is introduced and is in a deformed state, the elastic force, the pressure of the flowing medium and the liquid flow in the pipe 1 are maintained in a dynamic balance due to the balance of the spring 14, and at this time, the elastic expansion structure 13 is deformed as long as the pressure of the flowing medium is changed, thereby eliminating the initial amount of 2N.
In yet another embodiment provided by the embodiment of the present invention, further, the extrusion deformation sheet 2.1 at least partially protrudes from the inner wall of the pipeline 1, and the protrusion from the inner wall has two advantages, one of which narrows the flow channel of the pipeline 1 at the position of the extrusion deformation sheet 2.1, accelerates the flow velocity at the position, and promotes the impact force, and the other of which facilitates the direct impact of the liquid flow or the air flow by the extrusion deformation sheet 2.1 protruding from the inner wall.
Furthermore, a ring-shaped elastic thread 10 is arranged around the press-deformable piece 2.1, the ring-shaped elastic thread 10 on the one hand assists the regular deformation of the press-deformable piece 2.1 and on the other hand provides a restoring force after the press-deformable piece 2.1 is deformed.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (9)
1. A flow passively regulated conveying device comprises a pipeline, and is characterized in that an annular opening is formed in the inner wall of the pipeline;
the device also comprises a transmission mechanism, wherein the transmission mechanism comprises an annular active cavity, a passive cavity and a connecting channel for communicating the annular active cavity and the passive cavity, flowing media are filled in the annular active cavity, the passive cavity and the connecting channel, and the inner side wall of the annular active cavity is an extrusion deformation sheet and closes the annular opening;
the device also comprises a quantity adjusting assembly, the transmission mechanism comprises a moving part and a plugging cylinder, the plugging cylinder is plugged in the pipeline at the position located at the downstream of the extrusion deformation sheet, a plurality of flow holes are formed in the plugging cylinder, and the moving part is movably connected to the plugging cylinder;
the passive cavity is provided with an elastic telescopic part which drives the moving part, and the extruded stroke of the extrusion deformation sheet drives the moving part to shield the circulation hole.
2. The passively flow-regulated delivery device according to claim 1, wherein the annular active cavity, passive cavity, and connecting channel are of unitary construction.
3. The passively flow-regulated delivery device according to claim 1, wherein the flowing medium is hydraulic oil.
4. The passive flow regulation conveying device according to claim 1, further comprising a fine-tuning assembly, wherein the fine-tuning assembly comprises a handle, a connecting rod and a piston which are connected in sequence, a regulation chamber is arranged in the annular active cavity or the annular passive cavity, the piston is movably connected in the regulation chamber, and the connecting rod is movably connected to the active cavity in a sealing manner.
5. The passively flow-regulated delivery device according to claim 1, wherein the crush lobes are resilient metal or flexible lobes.
6. The passively flow-regulated delivery device according to claim 1, further comprising a housing forming a receiving cavity with an outer wall of the conduit, the transmission mechanism being located in the receiving cavity.
7. The passive flow regulation conveying device according to claim 1, wherein a driving hole is formed in the passive cavity, the elastic expansion part is located in the driving hole, and a driving rod is arranged at one end of the moving part and movably connected in the driving hole and connected with the elastic expansion part.
8. The passively flow-regulated delivery device according to claim 1, wherein the plugging cylinder is further provided with a constant-through hole, and the movement stroke of the moving element does not cover the constant-through hole.
9. The passively flow-rate regulated delivery device according to claim 8, wherein said flow opening is a rectangular opening and said movable member moves through a stroke from one side of said rectangular opening to the other side.
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| CN201911326766.8A CN110985885B (en) | 2019-12-20 | 2019-12-20 | Conveying device with passively regulated flow |
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| CN201911326766.8A CN110985885B (en) | 2019-12-20 | 2019-12-20 | Conveying device with passively regulated flow |
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| DE10322918A1 (en) * | 2003-05-21 | 2004-12-16 | Robert Bosch Gmbh | Valve for controlling a fluid |
| CN101025235A (en) * | 2006-02-24 | 2007-08-29 | 罗伯特·博世有限公司 | Directional or flow control valve |
| KR100980612B1 (en) * | 2008-09-02 | 2010-09-07 | 한국항공우주연구원 | A flow regulation valve |
| CN204852487U (en) * | 2015-06-29 | 2015-12-09 | 温州市慧能机械科技有限公司 | Hose flow control valve |
| CN106593802B (en) * | 2017-02-06 | 2019-06-18 | 宁波天泰美克智能科技有限公司 | A kind of pneumatic structure of oleo-pneumatic pump |
| CN108081243B (en) * | 2017-08-24 | 2021-02-26 | 深圳市罗伯医疗科技有限公司 | Walking-aid knee joint actuator and walking-aid robot |
| CN107387387B (en) * | 2017-08-30 | 2020-01-14 | 王湫锂 | Low-pressure variable-volume flow adjusting method and adjusting mechanism for flow-adjusting injection pump |
| CN207268170U (en) * | 2017-10-10 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of flow control valve |
| CN108168639B (en) * | 2017-12-11 | 2019-09-10 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of passive piston volume tube of overturning valve plug type |
| CN108150471B (en) * | 2017-12-26 | 2019-10-25 | 江苏艾伦弗罗机械制造有限公司 | A kind of two-way one-way speed-regulating valve |
| CN107917162B (en) * | 2017-12-27 | 2023-08-08 | 苏州西捷克缓冲科技有限公司 | Adjustable oil pressure buffer with automatic compensation function |
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