CN114791050B - Automatic back pressure valve and fluid metering and adding system - Google Patents
Automatic back pressure valve and fluid metering and adding system Download PDFInfo
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- CN114791050B CN114791050B CN202210426889.4A CN202210426889A CN114791050B CN 114791050 B CN114791050 B CN 114791050B CN 202210426889 A CN202210426889 A CN 202210426889A CN 114791050 B CN114791050 B CN 114791050B
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- 239000012530 fluid Substances 0.000 title claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 60
- 230000001105 regulatory effect Effects 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims description 95
- 210000000078 claw Anatomy 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 14
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/005—Electrical or magnetic means for measuring fluid parameters
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/202—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means actuated by an electric motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The application relates to the technical field of valves, and provides an automatic back pressure valve and a fluid metering and adding system, wherein the automatic back pressure valve comprises a back pressure valve body; the pressure sensor is arranged in the back pressure valve body and is positioned at the outlet end of the back pressure valve body, and the pressure sensor is used for detecting the pressure value in the back pressure valve body; the pressure regulating mechanism comprises a pressure regulating nut, a driving mechanism connected with the pressure regulating nut and a controller electrically connected with the driving mechanism, wherein the pressure regulating nut is connected with the back pressure valve body, the controller is electrically connected with the pressure sensor and receives a pressure value, the controller controls the driving mechanism to drive the pressure regulating nut to rotate so as to regulate the pressure value, the effect of automatically regulating the pressure value of the back pressure valve body is achieved, and compared with the prior art, the pressure value of the back pressure valve body is regulated more conveniently and rapidly, meanwhile, the uncontrollable risk of manual regulation is avoided, and the regulation precision is improved.
Description
Technical Field
The application relates to the technical field of valves, in particular to an automatic back pressure valve and a fluid metering and adding system.
Background
Back pressure valves are commonly used in the piping of various control systems, and the pressure of the medium flowing through the piping is generally adjustable due to the function of the back pressure valve itself, thereby acting as a shut-off and throttle on the piping.
At present, the back pressure valve is adjusted manually by manpower in the prior art, so that the operation is complicated, the labor is consumed, the adjusting precision is poor, manual hardware is needed for one instrument, uncontrollable risks exist due to the introduced human factors, and the reliability of the test result is poor.
Disclosure of Invention
The embodiment of the application aims to provide an automatic back pressure valve so as to realize the technical effects of automatically adjusting the pressure of the back pressure valve and improving the adjusting precision of the back pressure valve.
In a first aspect, embodiments of the present application provide an automatic back pressure valve comprising: a back pressure valve body; the pressure sensor is arranged in the back pressure valve body and is positioned at the outlet end of the back pressure valve body, and the pressure sensor is used for detecting the pressure value in the back pressure valve body; the pressure regulating mechanism comprises a pressure regulating nut, a driving mechanism connected with the pressure regulating nut and a controller electrically connected with the driving mechanism, wherein the pressure regulating nut is connected with the back pressure valve body, the controller is electrically connected with the pressure sensor and receives the pressure value, and the controller controls the driving mechanism to drive the pressure regulating nut to rotate so as to automatically regulate the pressure value to be a set value.
It should be noted that the set value may be manually input into the controller or may be sent to the controller through a terminal, and when the controller receives the set value, the controller also receives an instruction for adjusting the pressure value inside the back pressure valve body to the set value in real time by controlling the pressure adjusting mechanism.
The automatic back pressure valve provided by the embodiment of the application comprises a back pressure valve body, a pressure sensor and a pressure regulating mechanism, wherein the pressure sensor is arranged at the outlet end of the back pressure valve body and is positioned in the back pressure valve body; the pressure regulating mechanism comprises a pressure regulating nut, a controller and a driving mechanism, wherein the pressure regulating nut is connected with the back pressure valve body, the driving mechanism is connected with the pressure regulating nut, the controller is electrically connected with the pressure sensor and the driving mechanism, the pressure sensor can transmit the measured pressure value to the controller in real time, when a user needs to regulate the pressure value in the back pressure valve body up or down, the target pressure value (namely a set value) can be input to the controller, the controller can control the driving mechanism to drive the pressure regulating nut to rotate according to the target pressure value, so that the pressure value in the back pressure valve body is regulated to the target pressure value, after the regulation is completed, at the moment, the fluid medium needs to reach the target pressure value in the back pressure valve body to enable the back pressure valve body to form a passage inside, so that the fluid medium can smoothly flow in from the inlet end of the back pressure valve body, the effect of automatically regulating the pressure value of the back pressure valve body is achieved, compared with the prior art, the pressure value regulation of the back pressure valve body is more convenient and fast, meanwhile, the uncontrollable risk of manual regulation is avoided, and the regulation precision is improved.
In one possible implementation, the back pressure valve body includes: a chamber; the sealing component is arranged in the cavity; the inlet pipeline is arranged in the cavity, and the outlet end of the inlet pipeline is abutted against the sealing assembly; the outlet pipeline is arranged in the cavity, the outlet end of the outlet pipeline is arranged on the side wall of the cavity, and a fluid medium enters the inlet pipeline and extrudes the sealing assembly so as to communicate the inlet pipeline with the outlet pipeline.
In the above implementation, the back pressure valve body includes: the back pressure valve comprises a cavity, a sealing assembly, an inlet pipeline and an outlet pipeline, wherein the cavity is defined in the back pressure valve body, one end of the sealing assembly is connected with a pressure adjusting nut, and the other end of the sealing assembly is abutted against the outlet end of the inlet pipeline. When the pressure value in the back pressure valve body is zero, the sealing component is in a state of just contacting with the outlet end of the inlet pipeline, in the state, after the fluid medium enters the inlet pipeline, the fluid medium can smoothly enter the outlet pipeline without applying force to squeeze the sealing component and flow out of the back pressure valve body, and the pressure value measured by the pressure sensor is zero; when a user needs to adjust the pressure value in the back pressure valve body to a set value, the pressure adjusting nut can rotate under the control of the controller, so that the sealing component is close to the outlet end of the inlet pipeline and is in a close contact state with the outlet end of the inlet pipeline, in the state, after the fluid medium enters the inlet pipeline, a certain force needs to be applied to squeeze the sealing component, so that the sealing component is far away from the outlet end of the inlet pipeline, and the inlet pipeline is communicated with the outlet pipeline, and at the moment, the fluid medium has a certain pressure, and the pressure value is the set pressure value.
In one possible implementation, the seal assembly includes: the sealing ring is arranged at the outlet end of the inlet pipeline and is communicated with the inlet pipeline; the first end of the spring is connected with the pressure adjusting nut; the valve needle structure comprises a valve needle and a pressure spring pad, one end of the pressure spring pad is connected with the second end of the spring, the other end of the pressure spring pad is connected with one end of the valve needle, the valve needle extends along the length direction of the cavity, and the other end of the valve needle points to the sealing ring; the spring is compressed or stretched and pushes the valve needle to press the sealing ring or separate from the sealing ring so as to block or open the outlet end of the inlet pipeline.
In the implementation process, the sealing ring is an elastic piece with a through hole, two ends of the through hole of the sealing ring are respectively communicated with the inlet pipeline and the outlet pipeline, when the pressure value in the back pressure valve body is zero, the spring pressure is zero, the pressure born by the pressure spring pad and the valve needle is zero, the valve needle and the sealing ring are in a just-contacted state, at the moment, fluid medium can enter from the inlet pipeline and flow into the through hole of the sealing ring, finally flows to the outlet pipeline, and the pressure value measured by the pressure sensor is zero; when a user inputs a set value (assumed to be NMPa) to the controller and needs to execute the automatic back pressure valve, the driving mechanism controls the pressure adjusting nut to rotate, the pressure adjusting nut pushes the spring to enable the spring to be compressed, and then the pressure spring pad of the valve needle structure pushes the valve needle to move close to the sealing ring and presses the sealing ring to apply a certain acting force to plug the outlet end of the inlet pipeline, namely, plug the through hole of the sealing ring, at the moment, the pressure of the fluid medium rises due to the fact that the outlet end of the inlet pipeline is sealed by the valve needle and the sealing ring, the rising pressure acts on the valve needle to force the valve needle to move towards one end close to the spring, and when the pressure value rises to NMPa, the fluid medium enables the through hole of the sealing ring to be communicated with the outlet pipeline again.
In one possible implementation, the seal assembly further comprises: the valve needle penetrates through the sealing pressing piece and is abutted against the sealing ring; the valve needle sealing ring is sleeved on the outer peripheral side of the valve needle and is abutted against the side wall of the cavity; the distance between the sealing pressing piece and the valve needle sealing ring is equal to the diameter of the outlet pipeline.
In the realization process, the sealing pressing piece limits the sealing ring in a certain space, so that the sealing ring is prevented from moving, and the use of the automatic back pressure valve is influenced. In addition, the valve needle sealing ring is sleeved on the outer peripheral side of the valve needle and is abutted against the side wall of the cavity, the distance between the sealing pressing piece and the valve needle sealing ring is equal to the diameter of the outlet pipeline, the distance between the sealing pressing piece and the valve needle sealing ring is called the volume in the back pressure valve sealing space, compared with the back pressure valve in the prior art, the volume in the back pressure valve sealing space is greatly reduced, the volume in the back pressure valve sealing space is a long-term neglected problem, the inventor discovers that under the high-pressure and high-precision instrument requirements, the volume in the back pressure valve sealing space is a very important problem, under the high-pressure and high-precision instrument requirements, when the space where gas or liquid is compressed is large, the space becomes a damping system, when the pressure of the back pressure valve is adjusted, the pressure display is suddenly high and low, the back pressure valve is difficult to accurately control, and especially when a testing instrument with the back pressure valve is used for testing a certain index, if the tested index is related to the gas or liquid, the pressure is continuously changed along with the pressure, and even the testing process is very complicated and fails.
In one possible implementation, the driving mechanism includes: a speed reducing motor; the output end of the speed reducing motor is connected with the first end of the coupler, and the pressure adjusting nut is connected with the second end of the coupler.
In the implementation process, the driving mechanism comprises a gear motor and a coupler, two ends of the coupler are respectively connected with the pressure adjusting nut and the output end of the gear motor, the controller controls the gear motor to rotate, and the output end of the gear motor drives the pressure adjusting nut to rotate, so that the pressure value in the back pressure valve body is adjusted to a target pressure value.
In one possible implementation, the automatic back pressure valve further includes: the back pressure valve comprises a bottom plate, wherein one end of the bottom plate in the length direction is provided with a back pressure valve fixing seat, the back pressure valve fixing seat is provided with a mounting groove matched with the back pressure valve body, and the back pressure valve body is embedded in the mounting groove and fixedly connected with the back pressure valve fixing seat; the first sliding rail and the second sliding rail are positioned at the other end of the bottom plate in the length direction and are arranged at two sides of the bottom plate in the width direction in parallel; the first sliding block and the second sliding block are respectively connected with the first sliding rail and the second sliding rail in a sliding way, the coupler is connected with the first sliding block and the second sliding block, and the coupler rotates to drive the pressure adjusting nut to rotate and move along the length direction of the bottom plate, and the coupler drives the first sliding block and the second sliding block to move along the first sliding rail and the second sliding rail respectively.
In the above implementation, the automatic back pressure valve further includes: the back pressure valve fixing seat is arranged on the bottom plate and used for installing the back pressure valve body, the back pressure valve fixing seat is provided with a mounting groove, the back pressure valve body is embedded in the mounting groove and fixed on the back pressure valve fixing seat through a fastener (such as a screw), the pressure adjusting nut is located above the bottom plate and arranged along the length direction of the bottom plate, one end of the pressure adjusting nut is connected with the back pressure valve body, the other end of the pressure adjusting nut is connected with the coupler, the bottom plate is further provided with a first sliding rail and a second sliding rail which are parallel to each other and are located on two sides of the width direction of the bottom plate, the coupler is connected with the first sliding block and the second sliding block, the first sliding block and the second sliding block are respectively in sliding connection with the first sliding rail and the second sliding rail, when the coupler drives the pressure adjusting nut to rotate, the pressure adjusting nut can move along the length direction of the bottom plate to be close to or far away from the back pressure valve body, and meanwhile the pressure adjusting nut also drives the coupler to move along the length direction of the bottom plate, and when the coupler moves, the coupler is connected with the coupler, and the first sliding block and the second sliding block and the coupler.
In one possible implementation, the automatic back pressure valve further comprises: the connecting piece comprises a connecting plate and a mounting plate vertically connected with one end of the connecting plate, the connecting plate is positioned above the first sliding block and the second sliding block and fixedly connected with the first sliding block and the second sliding block, a groove matched with the coupler is formed in the mounting plate, and the coupler is arranged in the groove in a penetrating mode; and the motor fixing plate is fixedly connected with the mounting plate, the gear motor is connected with the motor fixing plate, and the first end of the coupler penetrates through the motor fixing plate and is connected with the output end of the gear motor.
In the realization process, the automatic back pressure valve further comprises a connecting piece and a motor fixing plate, wherein the connecting piece comprises a connecting plate and a mounting plate vertically connected with the connecting plate, the connecting plate is parallel to the axis direction of the coupler and is connected with the first sliding block and the second sliding block, a groove matched with the coupler is formed in the mounting plate, the motor fixing plate is fixedly connected with the mounting plate, a mounting hole communicated with the groove in the mounting plate is formed in the motor fixing plate, the gear motor is connected with the motor fixing plate, the first section of the coupler sequentially penetrates through the groove, the mounting hole and the output end of the gear motor, and the second end of the coupler is connected with a pressure adjusting nut, so that the automatic back pressure valve can be more stable during pressure adjustment, and accidental movement of each part is prevented.
In one possible implementation, the automatic back pressure valve further comprises: the moving plate is fixedly connected to the motor fixing plate; the photoelectric switch is fixedly connected to the bottom plate and is electrically connected with the driving mechanism, and when the moving plate and the photoelectric switch are both positioned at the same position in the length direction of the bottom plate, the pressure regulating mechanism is configured to be at an initial position, and the pressure value is zero; when the set value is zero, the pressure regulating mechanism rotates and moves along the length direction of the bottom plate, and the photoelectric switch controls the driving mechanism to stop running when the moving plate moves to the same position as the photoelectric switch.
In the above implementation, the automatic back pressure valve further includes: the movable plate and the photoelectric switch are specifically fixedly connected to the motor fixing plate, when the first sliding block and the second sliding block drive the connecting piece and the motor fixing plate to move, the movable plate can synchronously move with the motor fixing plate, the photoelectric switch is arranged on the bottom plate and is electrically connected with the driving mechanism, when the pressure adjusting mechanism is at the initial position, the movable plate and the photoelectric switch are located at the same position in the length direction of the bottom plate, at the moment, the pressure value in the back pressure valve body is zero, and the automatic back pressure valve is in the initial state. When the automatic back pressure valve carries out pressure adjustment, the movable plate can be far away from the photoelectric switch, when a user needs to restore the pressure regulating mechanism to an initial position, the user only needs to input a command with a set value of zero to the controller, at the moment, the controller can control the driving mechanism to rotate and move along the length direction of the bottom plate, when the movable plate moves to the same position as the photoelectric switch, the photoelectric switch can automatically control the driving mechanism to stop running, so that the pressure regulating mechanism is restored to the initial position, and the automatic back pressure valve can be quickly and accurately restored to the initial state by the user.
In one possible implementation, the driving mechanism further includes: and one end of the mechanical claw is connected with the second end of the coupler, and the other end of the mechanical claw is clamped on the outer periphery side of the pressure adjusting nut.
In the implementation process, the mechanical claw is connected to the second end of the coupler and clamped on the outer peripheral side of the pressure adjusting nut, and the mechanical claw is driven to rotate through the coupler so as to drive the pressure adjusting nut to rotate.
In a second aspect, embodiments of the present application also provide a fluid metering and dosing system comprising an automatic back pressure valve as claimed in any one of claims 1 to 9.
An embodiment of the second aspect of the present application provides a fluid metering and feeding system, which includes the automatic back pressure valve according to any one of the embodiments of the first aspect, so that the automatic back pressure valve has the technical effects of any one of the embodiments described above, and will not be described herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an automatic back pressure valve according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a back pressure valve body according to an embodiment of the present application;
FIG. 3 is a schematic view of an embodiment of an automatic back pressure valve according to the present application;
Wherein, the direction indicated by the double-headed arrow in fig. 1 is the length direction of the bottom plate;
wherein the direction indicated by the double-headed arrow in fig. 2 is the length direction of the chamber.
Icon: 100-an automatic back pressure valve; 1-a back pressure valve body; 2-a pressure sensor; 3-a pressure adjusting nut; 4-a driving mechanism; 401-a gear motor; 402-a coupling; 403-mechanical gripper; 5-chamber; 6-a seal assembly; 601-a sealing ring; 602-a spring; 603-a valve needle; 604-a compression spring pad; 605-sealing the compression member; 606-a valve needle sealing ring; 7-inlet piping; 8-outlet piping; 801-outlet end of the outlet line; 10-a bottom plate; 11-a back pressure valve fixing seat; 12-a first slide rail; 13-a second slide rail; 14-a first slider; 15-a second slider; 16-connecting plates; 17-a mounting plate; 18-a motor fixing plate; 19-a moving plate; 20-photoelectric switch.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, an automatic back pressure valve 100 provided in the embodiment of the present application includes a back pressure valve body 1, a pressure sensor 2 and a pressure adjusting mechanism, wherein the pressure sensor 2 is installed at an outlet end of the back pressure valve body 1 and is located inside the back pressure valve body 1, when the back pressure valve body 1 is applied to the apparatus to function, a fluid medium (such as gas or liquid) enters the back pressure valve body 1 from an inlet end of the back pressure valve body 1, according to an operation principle of the back pressure valve, after the fluid medium forms a certain pressure inside the back pressure valve body 1, the inside of the back pressure valve body 1 forms a passage, so that the fluid medium can flow from an inlet end of the back pressure valve body 1 to an outlet end of the back pressure valve body 1, and then flows out of the back pressure valve body 1, and when the fluid medium flows to the outlet end of the back pressure valve body 1, namely, the inside the back pressure valve body 1 forms a passage, and the pressure sensor 2 can measure a pressure value of the back pressure valve body 1, namely, and the pressure value of the fluid medium can be applied to the back pressure valve body 1; the pressure regulating mechanism comprises a pressure regulating nut 3, a controller (not shown in the figure) and a driving mechanism 4, wherein the pressure regulating nut 3 is connected with the back pressure valve body 1, the driving mechanism 4 is connected with the pressure regulating nut 3, the controller is electrically connected with the pressure sensor 2 and the driving mechanism, the measured pressure value can be transmitted to the controller in real time by the pressure sensor 2, when a user needs to regulate the pressure value in the back pressure valve body 1 up or down, the target pressure value can be input to the controller, namely, a set value is input, the controller can control the driving mechanism 4 to drive the pressure regulating nut 3 to rotate according to the target pressure value so as to regulate the pressure value in the back pressure valve body 1 to the target pressure value, when the regulation is completed, the fluid medium needs to reach the target pressure value in the back pressure valve body 1 at the moment, so that a passage is formed in the back pressure valve body 1 for the fluid medium to flow in from the inlet end of the back pressure valve body 1 smoothly, the effect of automatically regulating the pressure value of the back pressure valve body 1 is realized, compared with the prior art, the pressure value regulation of the back pressure valve body 1 is more convenient and rapid, meanwhile, the regulation risk is unavoidable, and the regulation precision is improved.
It should be noted that the pressure sensor 2 indicated in fig. 1 represents only the position where the pressure sensor 2 is located, and the sensing surface of the pressure sensor 2 is located substantially inside the back pressure valve body 1.
As shown in fig. 2, in one possible implementation, the back pressure valve body 1 comprises: a chamber 5; the sealing component 6 is arranged in the cavity 5, the inlet pipeline 7 is arranged in the cavity 5, and the outlet end of the inlet pipeline 7 is abutted against the sealing component 6; an outlet pipe 8 is arranged in the chamber 5, an outlet end 801 of the outlet pipe 8 is arranged on the side wall of the chamber 5, and fluid medium enters the inlet pipe 7 and presses the sealing component 6 so as to communicate the inlet pipe 7 with the outlet pipe 8.
In the above implementation, the back pressure valve body 1 includes: the back pressure valve comprises a chamber 5, a sealing assembly 6, an inlet pipeline 7 and an outlet pipeline 8, wherein the chamber 5 is defined in the back pressure valve body 1, one end of the sealing assembly 6 is connected with the pressure adjusting nut 3, and the other end of the sealing assembly is abutted against the outlet end of the inlet pipeline 7. When the pressure value inside the back pressure valve body 1 is zero, the sealing component 6 is in a state of just contacting with the outlet end of the inlet pipeline 7, in this state, after the fluid medium enters the inlet pipeline 7, the fluid medium can smoothly enter the outlet pipeline 8 without applying force to squeeze the sealing component 6 and flow out of the back pressure valve body 1, and the pressure value measured by the pressure sensor 2 is zero; when the user needs to adjust the pressure value inside the back pressure valve body 1 to the set value, the pressure adjusting nut 3 rotates under the control of the controller, so that the sealing component 6 is close to the outlet end of the inlet pipeline 7 and is in close contact with the outlet end of the inlet pipeline 7, in this state, after the fluid medium enters the inlet pipeline 7, a certain force needs to be applied to squeeze the sealing component 6, so that the sealing component 6 is far away from the outlet end of the inlet pipeline 7, and the inlet pipeline 7 is communicated with the outlet pipeline 8, and at this time, the fluid medium has a certain pressure, and the pressure value is the set pressure value.
As shown in fig. 2, in one possible implementation, the seal assembly 6 comprises: the sealing ring 601 is arranged at the outlet end of the inlet pipeline 7 and is communicated with the inlet pipeline 7; a spring 602, the first end of which is connected with the pressure adjusting nut 3; the valve needle structure comprises a valve needle 603 and a pressure spring pad 604 connected with the valve needle 603, wherein one end of the pressure spring pad 604 is connected with the second end of the spring 602, and the other end of the pressure spring pad is connected with one end of the valve needle 603; valve needle 603 extends along the length direction of chamber 5, and the other end of valve needle 603 is directed to seal ring 601; spring 602 is compressed or stretched and urges valve needle 603 against seal 601 or away from seal 601 to block or unblock the outlet end of inlet line 7.
In the above implementation process, the sealing ring 601 is an elastic member with a through hole, two ends of the through hole of the sealing ring 601 are respectively communicated with the inlet pipeline 7 and the outlet pipeline 8, when the pressure value in the back pressure valve body 1 is zero, at this time, the pressure of the spring 602 is zero, the pressure of the pressure spring pad 604 and the valve needle 603 is zero, the valve needle 603 and the sealing ring 601 are in a just-contacted state, at this time, fluid medium can enter from the inlet pipeline 7 and flow to the through hole of the sealing ring 601, and finally flow to the outlet pipeline 8, and the pressure value measured by the pressure sensor 2 is zero at this time; when the user inputs a set value (NMPa) to the controller and needs to execute the automatic back pressure valve 100, the driving mechanism 4 controls the pressure adjusting nut 3 to rotate, the pressure adjusting nut 3 pushes the spring 602 to compress the spring 602, so that the pressure spring pad 604 of the valve needle structure pushes the valve needle 603 to move close to the sealing ring 601 and presses the sealing ring 601 to apply a certain acting force to seal the outlet end of the inlet pipeline 7, that is, seal the through hole of the sealing ring 601, at this time, the fluid medium can be sealed by the valve needle 603 and the sealing ring 601 at the outlet end of the inlet pipeline 7 to increase the pressure of the fluid medium, the rising pressure can act on the valve needle 603 to force the valve needle 603 to move towards the end close to the spring 602, and when the pressure value rises to NMPa, the fluid medium can enable the through hole of the sealing ring 601 to be in communication with the outlet pipeline 8 again.
In one possible implementation, the sealing assembly 6 further comprises: the sealing pressing piece 605 is arranged on one side of the sealing ring 601 away from the inlet pipeline 7, and the valve needle 603 penetrates through the sealing pressing piece 605 and is abutted against the sealing ring 601; a needle seal ring 606 which is fitted around the outer periphery of the needle 603 and abuts against the side wall of the chamber 5; wherein the distance between the sealing constriction 605 and the valve needle sealing ring 606 is equal to the diameter of the outlet line 8.
In the above implementation process, the seal pressing member 605 limits the seal ring 601 in a certain space, so as to prevent the seal ring 601 from moving, and influence the use of the automatic back pressure valve 100. In addition, the valve needle sealing ring 606 is sleeved on the outer peripheral side of the valve needle 603 and is abutted against the side wall of the chamber 5, the distance between the sealing pressing member 605 and the valve needle sealing ring 606 is equal to the diameter of the outlet pipeline 8, the distance between the sealing pressing member 605 and the valve needle sealing ring 606 is called the volume in the back pressure valve sealing space, compared with the back pressure valve in the prior art, the volume in the back pressure valve sealing space is greatly reduced, the volume in the back pressure valve sealing space is a long-term neglected problem, the inventor of the application discovers that under the high pressure and high precision instrument requirement, the volume in the back pressure valve sealing space is a very important problem, gas and liquid can be compressed under high pressure, when the compressed space is very large, the space becomes a damping system, when the back pressure valve is adjusted by us, the pressure display is suddenly lowered, the back pressure valve is difficult to be accurately controlled, especially when a test with the back pressure valve is used for testing a certain index, the measured index is related to the gas or the pressure is continuously changed along with the pressure of the instrument, and even the gas or the test is very complicated and the liquid is very complicated.
As shown in fig. 3, in one possible implementation, the driving mechanism 4 includes: a speed reduction motor 401; the coupling 402, the output of gear motor 401 is connected with the first end of coupling 402, and pressure adjusting nut 3 is connected with the second end of coupling 402.
In the above implementation process, the driving mechanism 4 includes the gear motor 401 and the coupling 402, two ends of the coupling 402 are respectively connected with the pressure adjusting nut 3 and the output end of the gear motor 401, the controller controls the gear motor 401 to rotate, and the output end of the gear motor 401 drives the pressure adjusting nut 3 to rotate, so that the pressure value inside the back pressure valve body 1 is adjusted to the target pressure value.
As shown in fig. 3, in one possible implementation, the automatic back pressure valve 100 further includes: the back pressure valve comprises a bottom plate 10, wherein a back pressure valve fixing seat 11 is arranged at one end of the bottom plate 10 in the length direction, a mounting groove matched with the back pressure valve body 1 is formed in the back pressure valve fixing seat 11, and the back pressure valve body 1 is embedded in the mounting groove and fixedly connected with the back pressure valve fixing seat 11; the first slide rail 12 and the second slide rail 13 are positioned at the other end of the bottom plate 10 in the length direction and are arranged at two sides of the bottom plate 10 in the width direction in parallel; the first slide block 14 and the second slide block 15 are respectively connected with the first slide rail 12 and the second slide rail 13 in a sliding way, the coupler 402 is connected with the first slide block 14 and the second slide block 15, and when the coupler 402 rotates to drive the pressure adjusting nut 3 to rotate and move along the length direction of the bottom plate 10, the coupler 402 drives the first slide block 14 and the second slide block 15 to respectively move along the first slide rail 12 and the second slide rail 13.
In the above implementation, the automatic back pressure valve 100 further includes: the back pressure valve fixing seat 11 is arranged on the bottom plate 10 and is used for installing the back pressure valve body 1, the back pressure valve fixing seat 11 is provided with a mounting groove, the back pressure valve body 1 is embedded in the mounting groove and is fixed on the back pressure valve fixing seat 11 through a fastener (such as a screw), the pressure adjusting nut 3 is located above the bottom plate 10 and is arranged along the length direction of the bottom plate 10, one end of the pressure adjusting nut 3 is connected with the back pressure valve body 1, the other end of the pressure adjusting nut is connected with the coupler 402, the bottom plate 10 is further provided with a first sliding rail 12 and a second sliding rail 13 which are parallel to each other and are located on two sides of the width direction of the bottom plate 10, the coupler 402 is connected with a first sliding block 14 and a second sliding block 15, the first sliding block 14 and the second sliding block 15 are respectively connected with the first sliding rail 12 and the second sliding rail 13 in a sliding mode, when the output end of the speed reducing motor 401 drives the coupler 402 to rotate, the coupler 402 drives the pressure adjusting nut 3 to move along the length direction of the bottom plate 10 to be close to or far away from the back pressure valve body 1, the pressure adjusting nut 3 also drives the coupler 402 to move along the length direction of the bottom plate 10, the first sliding block 12 and the second sliding block 15 are connected with the first sliding block 14 and the second sliding block 15 when the first sliding block and the second sliding block 14 move smoothly along the first sliding block 14 and the first sliding block 13 and the second sliding block 13.
As shown in fig. 3, in one possible implementation, the automatic back pressure valve 100 further includes: the connecting piece comprises a connecting plate 16 and a mounting plate 17 vertically connected with one end of the connecting plate 16, the connecting plate 16 is positioned above the first slide block 14 and the second slide block 15 and fixedly connected with the first slide block 14 and the second slide block 15, a groove matched with the coupler 402 is formed in the mounting plate 17, and the coupler 402 is arranged in the groove in a penetrating mode; the motor fixed plate 18 is fixedly connected with the mounting plate 17, the gear motor 401 is connected with the motor fixed plate 18, and the first end of the coupler 402 penetrates through the motor fixed plate 18 and is connected with the output end of the gear motor 401.
In the implementation process, the automatic back pressure valve 100 further comprises a connecting piece and a motor fixing plate 18, the connecting piece comprises a connecting plate 16 and a mounting plate 17 vertically connected with the connecting plate 16, wherein the connecting plate 16 is parallel to the axis direction of the coupler 402 and is connected with the first sliding block 14 and the second sliding block 15, a groove matched with the coupler 402 is formed in the mounting plate 17, the motor fixing plate 18 is fixedly connected with the mounting plate 17, a mounting hole communicated with the groove in the mounting plate 17 is formed in the motor fixing plate 18, the gear motor 401 is connected with the motor fixing plate 18, a first section of the coupler 402 sequentially penetrates through the groove and the mounting hole to be connected with the output end of the gear motor 401, and a second end of the coupler 402 is connected with the pressure adjusting nut 3, so that the automatic back pressure valve 100 can be more stable in pressure adjustment and accidental movement of various components is prevented.
As shown in fig. 3, in one possible implementation, the automatic back pressure valve 100 further includes: the moving plate 19 is fixedly connected to the motor fixing plate 18; the photoelectric switch 20 is fixedly connected to the bottom plate 10 and is electrically connected with the driving mechanism 4, and when the moving plate 19 and the photoelectric switch 20 are both positioned at the same position in the length direction of the bottom plate 10, the pressure regulating mechanism is configured to be at an initial position, and the pressure value is zero; when the set value is zero, the pressure regulating mechanism rotates and moves along the length direction of the bottom plate 10, and when the moving plate 19 moves to the same position as the photoelectric switch 20, the photoelectric switch 20 controls the driving mechanism 4 to stop running.
In the above implementation, the automatic back pressure valve 100 further includes: the movable plate 19 and the photoelectric switch 20, specifically, the movable plate 19 is fixedly connected to the motor fixing plate 18, when the first slider 14 and the second slider 15 drive the connecting piece and the motor fixing plate 18 to move, the movable plate 19 will also move synchronously with the motor fixing plate 18, the photoelectric switch 20 is arranged on the bottom plate 10 and is electrically connected with the driving mechanism 4, when the pressure adjusting mechanism is at the initial position, the movable plate 19 and the photoelectric switch 20 are located at the same position in the length direction of the bottom plate 10, at this time, the pressure value inside the back pressure valve body 1 is zero, and the automatic back pressure valve 100 is at the initial state. When the automatic back pressure valve 100 is subjected to pressure adjustment, the moving plate 19 is far away from the photoelectric switch 20, when a user needs to restore the pressure adjusting mechanism to an initial position, the user only needs to input a command with a zero set value to the controller, at this time, the controller controls the driving mechanism 4 to rotate and move along the length direction of the bottom plate 10, and when the moving plate 19 moves to the same position as the photoelectric switch 20, the photoelectric switch 20 automatically controls the driving mechanism 4 to stop running, so that the pressure adjusting mechanism is restored to the initial position, and the user can quickly and accurately restore the automatic back pressure valve 100 to the initial state conveniently.
As shown in fig. 3, in one possible implementation, the driving mechanism 4 further includes: and a gripper 403, one end of the gripper 403 is connected to the second end of the coupling 402, and the other end of the gripper 403 is clamped to the outer circumferential side of the pressure adjusting nut 3.
In the above implementation process, the second end of the coupling 402 is connected with the gripper 403, the gripper 403 is clamped at the outer periphery side of the pressure adjusting nut 3, and the gripper 403 is driven to rotate by the coupling 402, so as to drive the pressure adjusting nut 3 to rotate.
In a second aspect, embodiments of the present application also provide a fluid metering and dosing system comprising an automatic back pressure valve 100 according to any one of claims 1 to 9.
The fluid metering and dosing system according to the second embodiment of the present application includes the automatic back pressure valve 100 according to any one of the first embodiment, so that the technical effects of any one of the above embodiments are achieved, and will not be described herein.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (7)
1. An automatic back pressure valve, comprising:
A back pressure valve body;
The pressure sensor is arranged in the back pressure valve body and is positioned at the outlet end of the back pressure valve body, and the pressure sensor is used for detecting the pressure value in the back pressure valve body;
The pressure regulating mechanism comprises a pressure regulating nut, a driving mechanism connected with the pressure regulating nut and a controller electrically connected with the driving mechanism, wherein the pressure regulating nut is connected with the back pressure valve body, the controller is electrically connected with the pressure sensor and receives the pressure value, and the controller controls the driving mechanism to drive the pressure regulating nut to rotate so as to automatically regulate the pressure value to a set value;
The back pressure valve body includes:
A chamber;
the sealing component is arranged in the cavity;
the inlet pipeline is arranged in the cavity, and the outlet end of the inlet pipeline is abutted against the sealing assembly;
The outlet pipeline is arranged in the cavity, the outlet end of the outlet pipeline is arranged on the side wall of the cavity, and a fluid medium enters the inlet pipeline and extrudes the sealing assembly so as to communicate the inlet pipeline with the outlet pipeline;
The seal assembly includes:
The sealing ring is arranged at the outlet end of the inlet pipeline and is communicated with the inlet pipeline, the sealing ring is an elastic piece with a through hole, and two ends of the through hole of the sealing ring are respectively communicated with the inlet pipeline and the outlet pipeline;
The first end of the spring is connected with the pressure adjusting nut;
The valve needle structure comprises a valve needle and a pressure spring pad, one end of the pressure spring pad is connected with the second end of the spring, the other end of the pressure spring pad is connected with one end of the valve needle, the valve needle extends along the length direction of the cavity, and the other end of the valve needle points to the sealing ring;
The spring is compressed or stretched and pushes the valve needle to press the sealing ring or separate from the sealing ring so as to block or open the outlet end of the inlet pipeline;
The seal assembly further comprises:
The valve needle penetrates through the sealing pressing piece and is abutted against the sealing ring;
the valve needle sealing ring is sleeved on the outer peripheral side of the valve needle and is abutted against the side wall of the cavity;
the distance between the sealing pressing piece and the valve needle sealing ring is equal to the diameter of the outlet pipeline.
2. The automatic back pressure valve of claim 1, wherein the drive mechanism comprises:
A speed reducing motor;
the output end of the speed reducing motor is connected with the first end of the coupler, and the pressure adjusting nut is connected with the second end of the coupler.
3. The automatic back pressure valve of claim 2, further comprising:
The back pressure valve comprises a bottom plate, wherein one end of the bottom plate in the length direction is provided with a back pressure valve fixing seat, the back pressure valve fixing seat is provided with a mounting groove matched with the back pressure valve body, and the back pressure valve body is embedded in the mounting groove and fixedly connected with the back pressure valve fixing seat;
the first sliding rail and the second sliding rail are positioned at the other end of the bottom plate in the length direction and are arranged at two sides of the bottom plate in the width direction in parallel;
the first sliding block and the second sliding block are respectively connected with the first sliding rail and the second sliding rail in a sliding way, the coupler is connected with the first sliding block and the second sliding block, and the coupler rotates to drive the pressure adjusting nut to rotate and move along the length direction of the bottom plate, and the coupler drives the first sliding block and the second sliding block to move along the first sliding rail and the second sliding rail respectively.
4. The automatic back pressure valve of claim 3, further comprising:
The connecting piece comprises a connecting plate and a mounting plate vertically connected with one end of the connecting plate, the connecting plate is positioned above the first sliding block and the second sliding block and fixedly connected with the first sliding block and the second sliding block, a groove matched with the coupler is formed in the mounting plate, and the coupler is arranged in the groove in a penetrating mode;
and the motor fixing plate is fixedly connected with the mounting plate, the gear motor is connected with the motor fixing plate, and the first end of the coupler penetrates through the motor fixing plate and is connected with the output end of the gear motor.
5. The automatic back pressure valve of claim 4, further comprising:
The moving plate is fixedly connected to the motor fixing plate;
The photoelectric switch is fixedly connected to the bottom plate and is electrically connected with the driving mechanism, and when the moving plate and the photoelectric switch are both positioned at the same position in the length direction of the bottom plate, the pressure regulating mechanism is configured to be at an initial position, and the pressure value is zero;
when the set value is zero, the pressure regulating mechanism rotates and moves along the length direction of the bottom plate, and the photoelectric switch controls the driving mechanism to stop running when the moving plate moves to the same position as the photoelectric switch.
6. The automatic back pressure valve of claim 2, wherein the drive mechanism further comprises:
And one end of the mechanical claw is connected with the second end of the coupler, and the other end of the mechanical claw is clamped on the outer periphery side of the pressure adjusting nut.
7. A fluid metering system comprising an automatic back pressure valve as claimed in any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210426889.4A CN114791050B (en) | 2022-04-21 | 2022-04-21 | Automatic back pressure valve and fluid metering and adding system |
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| CN202210426889.4A CN114791050B (en) | 2022-04-21 | 2022-04-21 | Automatic back pressure valve and fluid metering and adding system |
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| CN114791050B true CN114791050B (en) | 2024-06-04 |
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| CN115013573B (en) * | 2022-08-10 | 2022-12-06 | 上海宝邦医疗器械有限公司 | Air compressor pressure valve capable of accurately adjusting pressure |
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