CN115163461A - Diaphragm pump and accurate oil supply and discharge control method for diaphragm pump - Google Patents
Diaphragm pump and accurate oil supply and discharge control method for diaphragm pump Download PDFInfo
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- CN115163461A CN115163461A CN202211035565.4A CN202211035565A CN115163461A CN 115163461 A CN115163461 A CN 115163461A CN 202211035565 A CN202211035565 A CN 202211035565A CN 115163461 A CN115163461 A CN 115163461A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003921 oil Substances 0.000 claims abstract description 184
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 99
- 238000006073 displacement reaction Methods 0.000 claims abstract description 74
- 239000000523 sample Substances 0.000 claims abstract description 65
- 230000002159 abnormal effect Effects 0.000 claims description 33
- 238000007599 discharging Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000009434 installation Methods 0.000 description 6
- 239000013589 supplement Substances 0.000 description 5
- 230000002950 deficient Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0081—Special features systems, control, safety measures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a diaphragm pump and a diaphragm pump accurate oil supply and discharge control method, wherein the diaphragm pump comprises a pump body and a diaphragm, the diaphragm divides an inner cavity of the pump body into a hydraulic oil chamber and a medium chamber, a diaphragm guide rod is arranged in the middle of the diaphragm, the diaphragm guide rod can move along with the diaphragm, an oil supply and discharge control valve and a guide rod displacement probe are arranged on the hydraulic oil chamber at intervals, the oil supply and discharge control valve is communicated with a controller, the signal output end of the guide rod displacement probe is connected with the controller, the probe of the guide rod displacement probe extends into the hydraulic oil chamber and is adjacent to the end part of the diaphragm guide rod, the position of the end part of the diaphragm guide rod can be detected in real time, and the position information of the end part of the guide rod is fed back to the controller; after the controller receives the displacement information of the diaphragm guide rod, the current displacement interval of the diaphragm guide rod is judged according to the displacement information of the diaphragm guide rod, and the oil quantity condition of the hydraulic oil chamber is judged according to the current displacement interval of the diaphragm guide rod.
Description
Technical Field
The invention relates to the field of diaphragm pumps, in particular to a diaphragm pump and a method for controlling accurate oil supply and discharge of the diaphragm pump.
Background
Diaphragm pumps, also known as control pumps, are the main type of actuator that is operated by power to vary the fluid flow by receiving a control signal from a regulating control unit. The diaphragm pump is used in the control process to receive the control signal of the regulator or the computer, change the flow rate of the regulated medium and maintain the regulated parameters in the required range, so as to realize the automation of the production process. The diaphragm pump mainly changes the volume of a working chamber through the back-and-forth movement of a diaphragm so as to suck and discharge liquid, and in the application of the hydraulic diaphragm pump, the key technology for ensuring the performance of the hydraulic diaphragm pump is to control the hydraulic oil in a hydraulic chamber to achieve dynamic balance.
The existing diaphragm pump mainly adopts the following 2 control modes: one is mechanical oil supply and drainage control, and the other is electromagnetic oil supply and drainage control. Both of these have manually set the limit positions for oil replenishment or oil removal. The oil filling starting position of the diaphragm is judged by an oil filling probe (or a mechanical oil filling valve), or the oil discharging starting position of the diaphragm is judged by an oil discharging probe (or a mechanical oil discharging valve). In any case, the motion characteristics of the diaphragm near the front limit position and the rear limit position cannot be reflected, and signals are all switching value signals, so that the oil shortage or the oil excess of the hydraulic chamber is difficult to be accurately reflected, and accurate oil supplement and discharge control cannot be provided constantly. Meanwhile, the oil discharge probe and the oil supplement probe are both switching value signals, the motion characteristic of the diaphragm at the oil supplement and discharge position cannot be reflected, the diaphragm guide rod is provided with a magnetic ring, and the guide rod bracket and the delay are both made of non-magnetic materials, so that the processing difficulty is increased, and the cost is increased.
Disclosure of Invention
In view of the above disadvantages in the prior art, an object of the present invention is to provide a diaphragm pump and a method for controlling oil supply and discharge of the diaphragm pump accurately, which solve the problem that the oil supply and discharge of the existing diaphragm pump is not accurate enough and the limit position of oil supply and discharge needs to be set.
In order to solve the technical problems, the invention adopts the following technical scheme:
a diaphragm pump comprises a pump body, wherein a diaphragm is arranged in the middle of the pump body, the diaphragm divides an inner cavity of the pump body into a hydraulic oil cavity and a medium cavity, a piston assembly is arranged at one end, far away from the diaphragm, of the hydraulic oil cavity, a piston of the piston assembly can reciprocate in the horizontal direction and pushes the diaphragm to move together after pushing hydraulic oil in a hydraulic oil cavity to move; an inlet valve group component for sucking the medium and a discharge valve group component for conveying the medium are respectively arranged at the upper end and the lower end of the medium cavity; the device is characterized in that a diaphragm guide rod with the tail end extending into a hydraulic oil chamber and horizontally arranged is arranged in the middle of a diaphragm, the diaphragm guide rod can move along with the diaphragm, an oil supplementing and discharging control valve and a guide rod displacement probe are arranged on the hydraulic oil chamber at intervals, the oil supplementing and discharging control valve is communicated with a controller, the signal output end of the guide rod displacement probe is connected with the controller, the probe of the guide rod displacement probe extends into the hydraulic oil chamber and is adjacent to the end part of the diaphragm guide rod, the position of the end part of the diaphragm guide rod can be detected in real time, and the position information of the end part of the guide rod is fed back to the controller; the controller is used for receiving the diaphragm guide rod displacement position sent by the guide rod displacement probe, recording return position information of the diaphragm guide rod, judging the oil shortage or excess oil state of the hydraulic oil chamber and the abnormal situation of the diaphragm motion state through the return position information of the diaphragm guide rod, calculating the displacement amount, the oil shortage amount and the excess oil amount of the diaphragm guide rod, controlling the oil supply and discharge control valve to open the oil supply channel according to the calculated oil shortage amount, supplying oil to the hydraulic oil chamber, controlling the oil supply and discharge control valve to open the oil discharge channel according to the calculated excess oil amount, and discharging the hydraulic oil in the hydraulic oil chamber; when the piston assembly moves towards one side of the medium chamber, the hydraulic oil and the diaphragm are pushed to move together, the pressure of the medium is forced to rise, the inlet valve of the inlet valve group component is closed, the discharge valve of the discharge valve group component is opened, and the medium is conveyed through the discharge valve; when the piston assembly moves towards one side of the hydraulic oil cavity, the pressure in the hydraulic oil cavity is reduced, the discharge valve is closed under the action of the pressure of the outlet pipeline of the discharge valve group component, and meanwhile, the inlet valve of the inlet valve group component is opened under the action of the inlet pressure of the inlet valve group component, so that the diaphragm is pushed to drive the diaphragm guide rod to move together to suck a medium.
Further, the pump body includes cylinder liner, hydraulic pipe, cylinder body and cylinder cap from a left side to right interconnect, the inner chamber of cylinder liner, hydraulic pipe and cylinder body communicates each other, forms the hydraulic oil cavity, piston assembly installs in the cylinder liner, is equipped with a guide arm support at the cylinder body inner chamber, diaphragm guide arm one end and diaphragm fixed connection, the other end passes behind the guide arm support, stretches out outside the guide arm support to can be with diaphragm horizontal migration together under the exogenic action.
Furthermore, the diaphragm is arranged in the cylinder body and consists of an annular installation part and a diaphragm part; an inner lining is arranged between the cylinder body and the diaphragm.
Furthermore, the guide rod displacement probe comprises a probe device box and a displacement probe, wherein a probe signal line interface is arranged at the top end of the probe device box and is connected with the controller through a signal line; the guide rod displacement probe is vertically arranged, and a gap is formed between the bottom of the displacement probe of the guide rod displacement probe and the diaphragm guide rod.
Furthermore, one end of the diaphragm guide rod, which is close to the guide rod displacement probe, corresponds to the middle of the guide rod displacement probe.
The method for accurately controlling oil supply and drainage of the diaphragm pump is as follows:
after the controller receives the displacement information of the diaphragm guide rod, judging the current displacement interval of the diaphragm guide rod according to the displacement information of the diaphragm guide rod, and judging the oil quantity condition of the hydraulic oil chamber according to the current displacement interval of the diaphragm guide rod; specifically, the detection width of the guide rod displacement probe is divided into five intervals according to the normal movement stroke of the diaphragm and the displacement interval of the diaphragm guide rod in the stroke, the five intervals are sequentially divided from one side of the hydraulic oil chamber to one side of the medium chamber into a severe oil shortage and extreme abnormal interval of the diaphragm movement state, an oil shortage stroke interval, a normal stroke interval, a multi-oil stroke interval, a severe multi-oil and extreme abnormal interval of the diaphragm movement state, and when the current return stroke interval of the diaphragm guide rod is in the severe oil shortage and extreme abnormal interval of the diaphragm movement state, the hydraulic oil chamber is judged to be in the severe oil shortage and extreme abnormal state of the diaphragm movement state; when the current return interval of the diaphragm guide rod is in the oil-starved stroke interval, judging that the hydraulic oil chamber is in an oil-starved state; when the current return interval of the diaphragm guide rod is in a multi-oil stroke interval, judging that the hydraulic oil chamber is in a multi-oil state; when the current return interval of the diaphragm guide rod is in a severe oil-rich and diaphragm movement state extreme abnormal interval, determining that the hydraulic oil chamber is in a severe oil-rich and diaphragm movement state extreme abnormal state;
when the hydraulic oil chamber is determined to be in an oil shortage state, the oil shortage quantity meets the following functional relation: oil quantity Q qy = f (x, D), where x is a return displacement of a current diaphragm guide rod, D is a minimum inflexible size of a central portion of the diaphragm, and D is a clamping size of the diaphragm; after the oil shortage is calculated, the controller controls the time for controlling the oil supply and drainage control valve to open the oil supply channel according to the oil shortage and the oil supply pressure parameter, and further accurate oil supply to the hydraulic oil cavity is achieved;
when the hydraulic oil chamber is judged to be in a multi-oil state, the multi-oil quantity meets the following functional relation: multiple oil mass Q dy = g (x, D), wherein x is a return stroke displacement amount of a current diaphragm guide rod, D is a minimum inflexible size of a central part of the diaphragm, and D is a diaphragm clamping size; after the oil amount is calculated, the controller controls the time for opening the oil discharge channel of the oil supply and discharge control valve according to the calculated oil amount and the oil discharge pressure, and therefore the hydraulic oil in the hydraulic oil chamber is discharged accurately.
Further, when the hydraulic oil chamber is in a serious oil shortage and extreme abnormal state of the movement state of the diaphragm or the hydraulic oil chamber is in a serious oil shortage and extreme abnormal state of the movement state of the diaphragm, the controller sends out an alarm signal.
Compared with the prior art, the invention has the following beneficial effects:
the method has the advantages that the real-time detection of the motion characteristics of the diaphragm near the natural position of the diaphragm by the single analog quantity signal detection probe is realized, and the accurate control of the oil quantity of the hydraulic chamber is further realized. Compared with the oil-discharge-free control technology of mechanical type and electromagnetic type, the oil-discharge-free control technology has qualitative changes: mechanical (electromagnetic) is point-to-point control, while the patented technology is continuous analog signal control.
The abnormal condition of the diaphragm moving near the natural position can be effectively judged, and fault diagnosis such as diaphragm breakage can be realized.
And thirdly, accurate oil supplement or oil discharge can be realized according to specific quantitative parameters of oil shortage or oil excess, and the diaphragm is in a hydraulic oil balance state in each working stroke.
The control technology can realize that the diaphragm is automatically recognized to be in an oil shortage state or a multi-oil state, hydraulic oil balance adjustment is automatically carried out, and manual intervention and manual prejudgment of the front and rear limit positions of the diaphragm are not needed (the front and rear limit positions of the diaphragm are manually prejudged to have more uncertainty and rationality).
The control idea and principle are completely different from electromagnetic control (or mechanical type), and the intelligent degree of the control method is very high
Sixthly, the device is not influenced by environments such as a magnetic field and temperature, is wide in application range, convenient to overhaul and maintain and high in reliability.
And the diaphragm guide rod is a conventional part (without a magnetic ring, special materials and manufacturing are not needed), special design, processing and material control are not needed, and the mounting difficulty and cost are reduced.
And the guide rod bracket is also made of conventional materials, so that special materials and control are not needed, and the cost is reduced.
The self-lifting device has the advantages of self-lifting, simple structure and low running cost of the whole device.
The control method has the advantages that fewer parts are needed for realizing the control method, fewer wearing parts are needed in the operation, and the operation cost is reduced.
The structure of the heat exchanger and the assembly connection is simple and the realization is easy.
Drawings
FIG. 1 is a schematic sectional view of a diaphragm pump according to an embodiment;
FIG. 2 is an enlarged schematic view of the mounting structure of the diaphragm and guide displacement probe in the embodiment;
fig. 3 is an enlarged schematic view of the portion I in fig. 2.
In the figure: 1. a piston member; 2. a cylinder liner; 3. a hydraulic tube; 4. an oil supply and discharge control valve; 5. a guide rod displacement probe; 51. a probe signal line interface; 52. a probe device cartridge; 53. a displacement probe; 6. a diaphragm guide rod; 7. a guide bar support; 8. a cylinder body; 9. a diaphragm; 10. an inner liner; 11. a discharge valve block member; 12. a cylinder cover; 13. an inlet valve block component; 14. a straw seat; 15. a support member.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-3, a diaphragm pump includes a pump body, a diaphragm 9 is disposed in the middle of the pump body, the diaphragm 9 divides an inner cavity of the pump body into a hydraulic oil chamber and a medium chamber, a piston assembly 1 is disposed at one end of the hydraulic oil chamber far from the diaphragm 9, a piston of the piston assembly 1 can reciprocate in a horizontal direction, and pushes the diaphragm 9 to move together after pushing hydraulic oil in the hydraulic oil chamber to move; an inlet valve group component 13 for sucking the medium and a discharge valve group component 11 for conveying the medium are respectively arranged at the upper end and the lower end of the medium chamber; a diaphragm guide rod 6 with the tail end extending into the hydraulic oil chamber and horizontally arranged is arranged in the middle of the diaphragm 9, the diaphragm guide rod 6 can move along with the diaphragm 9, an oil supply and discharge control valve 4 and a guide rod displacement probe 5 are arranged on the hydraulic oil chamber at intervals, the oil supply and discharge control valve 4 is communicated with a controller, the signal output end of the guide rod displacement probe 5 is connected with the controller (not shown in the figure), the probe of the guide rod displacement probe 5 extends into the hydraulic oil chamber and is adjacent to the end part of the diaphragm guide rod 6, the position of the end part of the diaphragm guide rod 6 can be detected in real time, and the position information of the end part of the guide rod is fed back to the controller; the controller is used for receiving the displacement position of the diaphragm guide rod 6 sent by the guide rod displacement probe 5, judging the oil shortage or excess state of the hydraulic oil chamber and the abnormal situation of the motion state of the diaphragm 9 through the return position information of the diaphragm guide rod 6 after recording the return position information of the diaphragm guide rod 6, calculating the displacement amount, oil shortage amount and excess oil amount of the diaphragm guide rod 6, controlling the oil supply and discharge control valve 4 to open an oil supply channel according to the calculated oil shortage amount, supplying oil to the hydraulic oil chamber, controlling the oil supply and discharge control valve 4 to open an oil discharge channel according to the calculated excess oil amount, and discharging the hydraulic oil in the hydraulic oil chamber; when the piston assembly 1 moves towards one side of the medium chamber, the hydraulic oil is pushed to move together with the diaphragm 9, the pressure of the medium is forced to rise, the inlet valve of the inlet valve block component 13 is closed, the discharge valve of the discharge valve block component 11 is opened, and the medium is conveyed through the discharge valve; when the piston assembly 1 moves towards one side of the hydraulic oil chamber, the pressure in the hydraulic oil chamber is reduced, the discharge valve is closed under the action of the pressure of the outlet pipeline of the discharge valve block assembly 11, and meanwhile, the inlet valve of the inlet valve block assembly 13 is opened under the action of the inlet pressure of the inlet valve block assembly 13, so that the diaphragm 9 is pushed to drive the diaphragm guide rod 6 to move together to suck a medium.
As shown in fig. 1, the pump body in this embodiment includes a cylinder sleeve 2, a hydraulic tube 3, a cylinder body 8, and a cylinder cover 12, which are connected to each other from left to right, inner cavities of the cylinder sleeve 2, the hydraulic tube 3, and the cylinder body 8 are communicated with each other to form the hydraulic oil chamber, the piston assembly 1 is installed in the cylinder sleeve 2 (and is in sliding seal with the cylinder sleeve), a guide rod support 7 is disposed in the cylinder body inner cavity, one end of the diaphragm guide rod 6 is fixedly connected to the diaphragm 9, and the other end of the diaphragm guide rod extends out of the guide rod support 7 after passing through the guide rod support 7, and can horizontally move in the hydraulic oil chamber together with the diaphragm 9 under the action of an external force. In order to facilitate the assembly of the diaphragm guide, a transverse channel for the reciprocating movement of the diaphragm guide 6 is provided in the middle of the guide support 7.
As shown in fig. 1 and 2, the diaphragm 9 is installed in the cylinder 8 and is composed of an annular installation part and a membrane part, one side of the annular installation part is connected with the outer edge of the membrane part, the other side of the annular installation part is connected with each other, and the annular installation part and the membrane part are integrally formed; an inner liner 10 is provided between the cylinder 8 and the diaphragm 9. The inner lining body is mainly used for solving the problem of stress concentration of the inner cavity of the cylinder body at high temperature and high pressure, the inner lining body is firstly installed in the cylinder body during installation, and the edge of the diaphragm is tightly pressed through the cylinder cover after the diaphragm is installed, so that the diaphragm divides the inner cavity of the cylinder body into a hydraulic oil chamber and a medium chamber.
The pump body is supported and fixed by a bearing part 15, and the medium chamber is communicated with the inlet valve group part 13 by a suction pipe seat 14.
As shown in fig. 2 and 3, the guide rod displacement probe 5 includes a probe device box 52 and a displacement probe 53 which are arranged up and down, a probe signal line interface 51 is arranged at the top end of the probe device box 52, and the probe signal line interface 51 is connected with the controller through a signal line; the guide rod displacement probe 5 is vertically arranged, and a gap is formed between the bottom of the displacement probe of the guide rod displacement probe 5 and the diaphragm guide rod 6.
The diaphragm guide 6 in this embodiment is a conventional part, and one end of the diaphragm guide 6 near the guide displacement probe 5 corresponds to the middle of the guide displacement probe 5.
The accurate oil supply and discharge control method of the diaphragm pump comprises the following steps: after the controller receives the displacement information of the diaphragm guide rod 6, judging the current displacement interval of the diaphragm guide rod 6 according to the displacement information of the diaphragm guide rod 6, and judging the oil quantity condition of the hydraulic oil chamber according to the current displacement interval of the diaphragm guide rod 6; specifically, the detection width of the guide rod displacement probe 5 is divided into five intervals according to the movement stroke of the diaphragm 9 and the displacement interval of the diaphragm guide rod 6 in the stroke (the division of the specific interval range is determined by jointly calculating according to the diaphragm size, the diaphragm deflection frequency and the natural maximum displacement position of the diaphragm), and the detection width is from one side of the hydraulic oil chamber to the medium chamberOne side is divided into severe oil shortage and extremely abnormal interval of diaphragm motion state (L in figure 3) 5 -L 4 Interval range), oil shortage stroke interval (L in fig. 3) 4 -L 3 Interval range), normal trip interval (L in fig. 3) 3 -L 2 Interval range), multiple oil stroke interval (L in fig. 3) 2 -L 1 Interval range), severe oily and extremely abnormal interval of diaphragm motion state (L in fig. 3) 1 Interval range), when the current return interval of the diaphragm guide rod 6 is in a serious oil shortage and extremely abnormal interval of the movement state of the diaphragm 9 (namely the interval range from L5 to L4 in the figure), the hydraulic oil chamber is judged to be in a serious oil shortage and extremely abnormal state of the movement state of the diaphragm 9; when the current return stroke interval of the diaphragm guide rod 6 is in the oil shortage stroke interval (namely L) 4 -L 3 Interval range), determining that the hydraulic oil chamber is in an oil shortage state; when the current return interval of the diaphragm guide rod 6 is in a multi-oil stroke interval (namely L) 2 -L 1 Interval range), the hydraulic oil chamber is judged to be in a multi-oil state; when the current return interval of the diaphragm guide rod 6 is in a severe oily and extremely abnormal interval (namely L) of the motion state of the diaphragm 9 1 Interval range), the hydraulic oil chamber is judged to be in a serious oil-rich and extremely abnormal state of the movement state of the diaphragm;
when the hydraulic oil chamber is determined to be in an oil shortage state: the oil shortage quantity satisfies the following functional relation: oil quantity Q qy = f (x, D), where x is a return displacement of a current diaphragm guide rod, D is a minimum inflexible size of a central portion of the diaphragm, and D is a clamping size of the diaphragm; after the oil shortage quantity is calculated, the controller controls the time for opening the oil supply channel of the oil supply and discharge control valve according to the oil shortage quantity and the oil supply pressure parameter, and therefore accurate oil supply to the hydraulic oil cavity is achieved;
when the hydraulic oil chamber is judged to be in a multi-oil state, the multi-oil quantity meets the following functional relation: multiple oil mass Q dy = g (x, D), wherein x is the return stroke displacement of the current diaphragm guide rod, D is the minimum unflexed size of the central part of the diaphragm, and D is the diaphragm clamping size; after calculating the amount of the oil, the controller controls the oil supply and discharge control according to the calculated amount of the oil in combination with the oil discharge pressureAnd after the valve opens the oil discharge channel, the hydraulic oil in the hydraulic oil chamber is accurately discharged.
When the hydraulic oil chamber is in a serious oil shortage state and a diaphragm movement state extreme abnormal state or the hydraulic oil chamber is in a serious oil shortage state and a diaphragm movement state extreme abnormal state, the controller sends out an alarm signal, a worker judges whether the diaphragm movement state is abnormal or not according to the strength of the alarm signal and the alarm time, if the diaphragm movement state is seriously abnormal, fault diagnosis is sent out, and if the diaphragm movement state is generally normal, the hydraulic oil chamber is judged to be in a serious oil shortage state or a serious oil excess state.
And under the severe oil-rich state, the oil-rich quantity is calculated by adopting a calculation formula of the oil-rich quantity, and under the severe oil-deficient state, the oil-deficient quantity is calculated by adopting a calculation formula of the oil-deficient quantity.
Adopt above-mentioned diaphragm pump to mend after oil extraction control, compare prior art, have following beneficial effect:
the method has the advantages that the real-time detection of the motion characteristics of the diaphragm near the natural position of the diaphragm by the single analog quantity signal detection probe is realized, and the accurate control of the oil quantity of the hydraulic chamber is further realized. Compared with the oil-discharge-free control technology of mechanical type and electromagnetic type, the oil-discharge-free control technology has qualitative changes: mechanical (electromagnetic) is point-to-point control, while the patented technology is continuous analog signal control.
The abnormal condition of the diaphragm moving near the natural position can be effectively judged, and fault diagnosis such as diaphragm breakage can be realized.
And thirdly, accurate oil supplement or oil discharge can be realized according to specific quantitative parameters of oil shortage or oil abundance, and the diaphragm is in a hydraulic oil balance state in each working stroke.
And fourth, the control technology can realize that the diaphragm is automatically recognized to be in an oil shortage state or a multi-oil state, hydraulic oil balance adjustment is automatically carried out, and manual intervention and manual prejudgment on the front and rear limit positions of the diaphragm are not needed (the front and rear limit positions of the diaphragm are manually prejudged to have more uncertainty and rationality).
The control idea and principle are completely different from electromagnetic control (or mechanical type), and the intelligent degree of the control method is very high
Sixthly, the device is not influenced by environments such as a magnetic field and temperature, is wide in application range, convenient to overhaul and maintain and high in reliability.
The diaphragm guide rod is a conventional part (without a magnetic ring, special materials and manufacturing are not needed), special design, machining and material control are not needed, and mounting difficulty and cost are reduced.
And the guide rod bracket is also made of conventional materials, so that special materials and control are not needed, and the cost is reduced.
The self-lifting device has the advantages of self-lifting, simple structure and low running cost.
The control method has the advantages that fewer parts are needed for realizing the control method, fewer wearing parts are needed in the operation, and the operation cost is reduced.
The structure of the heat exchanger and the assembly connection is simple and the realization is easy.
When the hydraulic oil chamber is in a serious oil shortage and extremely abnormal diaphragm movement state or the hydraulic oil chamber is in a serious oil shortage and extremely abnormal diaphragm 9 movement state, the controller sends out an alarm signal.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that the technical solutions of the present invention can be modified or substituted with equivalent solutions without departing from the spirit and scope of the technical solutions, and all should be covered in the claims of the present invention.
Claims (7)
1. A diaphragm pump comprises a pump body, wherein a diaphragm is arranged in the middle of the pump body, the diaphragm divides an inner cavity of the pump body into a hydraulic oil cavity and a medium cavity, a piston assembly is arranged at one end, far away from the diaphragm, of the hydraulic oil cavity, a piston of the piston assembly can reciprocate in the horizontal direction, and pushes the diaphragm to move together after pushing hydraulic oil in a hydraulic oil cavity to move; an inlet valve group component for sucking the medium and a discharge valve group component for conveying the medium are respectively arranged at the upper end and the lower end of the medium chamber; the hydraulic oil filling and discharging device is characterized in that a diaphragm guide rod with the tail end extending into a hydraulic oil cavity and horizontally arranged is arranged in the middle of a diaphragm, the diaphragm guide rod can move along with the diaphragm, an oil filling and discharging control valve and a guide rod displacement probe are arranged on a hydraulic oil cavity at intervals, the oil filling and discharging control valve is communicated with a controller, the signal output end of the guide rod displacement probe is connected with the controller, the probe of the guide rod displacement probe extends into the hydraulic oil cavity and is adjacent to the end part of the diaphragm guide rod, the position of the end part of the diaphragm guide rod can be detected in real time, and the position information of the end part of the guide rod is fed back to the controller; the controller is used for receiving the diaphragm guide rod displacement position sent by the guide rod displacement probe, recording return position information of the diaphragm guide rod, judging the oil shortage or excess oil state of the hydraulic oil chamber and the abnormal situation of the diaphragm motion state through the return position information of the diaphragm guide rod, calculating the displacement amount, the oil shortage amount and the excess oil amount of the diaphragm guide rod, controlling the oil supply and discharge control valve to open the oil supply channel according to the calculated oil shortage amount, supplying oil to the hydraulic oil chamber, controlling the oil supply and discharge control valve to open the oil discharge channel according to the calculated excess oil amount, and discharging the hydraulic oil in the hydraulic oil chamber; when the piston assembly moves towards one side of the medium chamber, the hydraulic oil and the diaphragm are pushed to move together, the pressure of the medium is forced to rise, the inlet valve of the inlet valve group component is closed, the discharge valve of the discharge valve group component is opened, and the medium is conveyed through the discharge valve; when the piston assembly moves towards one side of the hydraulic oil cavity, the pressure in the hydraulic oil cavity is reduced, the discharge valve is closed under the action of the pressure of the outlet pipeline of the discharge valve group component, and meanwhile, the inlet valve of the inlet valve group component is opened under the action of the inlet pressure of the inlet valve group component, so that the diaphragm is pushed to drive the diaphragm guide rod to move together to suck a medium.
2. The diaphragm pump according to claim 1, wherein the pump body comprises a cylinder sleeve, a hydraulic pipe, a cylinder body and a cylinder cover which are connected with each other from left to right, inner cavities of the cylinder sleeve, the hydraulic pipe and the cylinder body are communicated with each other to form the hydraulic oil chamber, the piston assembly is installed in the cylinder sleeve, a guide rod support is arranged in the inner cavity of the cylinder body, one end of the diaphragm guide rod is fixedly connected with the diaphragm, and the other end of the diaphragm guide rod extends out of the guide rod support after penetrating through the guide rod support and can horizontally move together with the diaphragm under the action of external force.
3. A membrane pump according to claim 2, characterized in that the membrane is mounted in a cylinder, between which cylinder and membrane a lining is provided.
4. The diaphragm pump according to claim 1, 2 or 3, wherein the guide rod displacement probe comprises a probe unit case and a displacement probe, a probe signal line interface is provided at the top end of the probe unit case, and the probe signal line interface is connected with the controller through a signal line; the guide rod displacement probe is vertically arranged, and a gap is formed between the bottom of the displacement probe of the guide rod displacement probe and the diaphragm guide rod.
5. The diaphragm pump of claim 4 wherein the end of the diaphragm guide rod adjacent to the guide rod displacement probe corresponds to the middle of the guide rod displacement probe.
6. An accurate oil supply and discharge control method for a diaphragm pump, which is characterized in that the diaphragm pump is as claimed in any one of claims 1 to 5, and the oil supply and discharge control method for the diaphragm pump is as follows:
after the controller receives the displacement information of the diaphragm guide rod, judging the current displacement interval of the diaphragm guide rod according to the displacement information of the diaphragm guide rod, and judging the oil quantity condition of the hydraulic oil chamber according to the current displacement interval of the diaphragm guide rod; specifically, the detection width of the guide rod displacement probe is divided into five intervals according to the normal movement stroke of the diaphragm and the displacement interval of the diaphragm guide rod in the stroke, the five intervals are sequentially divided from one side of the hydraulic oil chamber to one side of the medium chamber into a severe oil shortage and extreme abnormal interval of the diaphragm movement state, an oil shortage stroke interval, a normal stroke interval, a multi-oil stroke interval, a severe multi-oil and extreme abnormal interval of the diaphragm movement state, and when the current return stroke interval of the diaphragm guide rod is in the severe oil shortage and extreme abnormal interval of the diaphragm movement state, the hydraulic oil chamber is judged to be in the severe oil shortage and extreme abnormal state of the diaphragm movement state; when the current return interval of the diaphragm guide rod is in the oil-starved stroke interval, judging that the hydraulic oil chamber is in an oil-starved state; when the current return interval of the diaphragm guide rod is in a multi-oil stroke interval, judging that the hydraulic oil chamber is in a multi-oil state; when the current return interval of the diaphragm guide rod is in a serious oil-rich and diaphragm movement state extremely abnormal interval, judging that the hydraulic oil chamber is in a serious oil-rich and diaphragm movement state extremely abnormal state;
when the hydraulic oil chamber is determined to be in an oil shortage state, the oil shortage quantity meets the following functional relation: oil shortage Q qy F (x, D), wherein x is the return displacement of the current diaphragm guide rod, D is the minimum unflexed size of the central part of the diaphragm, and D is the diaphragm clamping size; after the oil shortage is calculated, the controller controls the time for controlling the oil supply and drainage control valve to open the oil supply channel according to the oil shortage and the oil supply pressure parameter, and further accurate oil supply to the hydraulic oil cavity is achieved;
when the hydraulic oil chamber is judged to be in a multi-oil state, the multi-oil quantity meets the following functional relation: multiple oil mass Q dy = g (x, D), wherein x is the return stroke displacement of the current diaphragm guide rod, D is the minimum unflexed size of the central part of the diaphragm, and D is the diaphragm clamping size; after the amount of the oil is calculated, the controller controls the time for opening the oil discharge passage of the oil supply and discharge control valve according to the calculated amount of the oil and the oil discharge pressure, so that the hydraulic oil in the hydraulic oil chamber is accurately discharged.
7. The method for controlling the precise oil supply and discharge of the diaphragm pump according to claim 6, wherein the controller sends out an alarm signal when the hydraulic oil chamber is determined to be in a severe oil shortage state and an extreme abnormal state of the diaphragm movement state or the hydraulic oil chamber is determined to be in a severe oil excess state and an extreme abnormal state of the diaphragm movement state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211035565.4A CN115163461B (en) | 2022-08-26 | 2022-08-26 | Diaphragm pump and diaphragm pump accurate oil supplementing and discharging control method |
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| CN202211035565.4A CN115163461B (en) | 2022-08-26 | 2022-08-26 | Diaphragm pump and diaphragm pump accurate oil supplementing and discharging control method |
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| CN115163461A true CN115163461A (en) | 2022-10-11 |
| CN115163461B CN115163461B (en) | 2024-09-03 |
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| JPH05296151A (en) * | 1992-04-22 | 1993-11-09 | Aisan Ind Co Ltd | Diaphragm pump |
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|---|---|
| CN115163461B (en) | 2024-09-03 |
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