CN218955880U - Electromagnetic switching valve and piston type gas flow calibration system - Google Patents
Electromagnetic switching valve and piston type gas flow calibration system Download PDFInfo
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- CN218955880U CN218955880U CN202223018957.8U CN202223018957U CN218955880U CN 218955880 U CN218955880 U CN 218955880U CN 202223018957 U CN202223018957 U CN 202223018957U CN 218955880 U CN218955880 U CN 218955880U
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Abstract
The utility model discloses an electromagnetic switching valve and a piston type gas flow calibration system, wherein the electromagnetic switching valve comprises a valve body, a fixed electromagnetic part and a movable iron core part, two air inlet nozzles and two air outlet nozzles are arranged on the valve body, the fixed electromagnetic part and the movable iron core part are arranged in an inner cavity of the valve body, and the fixed electromagnetic part is electrified to generate magnetic force so as to drive the movable iron core part to move towards a direction close to or far away from the air outlet nozzles, so that the bypass is connected or disconnected. The electromagnetic switching valve is a low-resistance and large-drift-diameter electromagnetic valve, is used in a bypass of a dry-type piston type gas flowmeter, can ensure stability of rising of a piston when detecting pulsating flow, and can avoid vibration after falling back.
Description
Technical Field
The utility model relates to the technical field of gas flow detection, in particular to an electromagnetic switching valve and a piston type gas flow calibration system.
Background
When the environment detection instrument is calibrated in an online flow mode, besides the conventional soap film flowmeter, a novel dry gas flow calibration device is gradually popularized and applied in recent years by virtue of the advantages of high precision, simplicity and convenience in operation and the like. The basic principle is that the flow is calculated by detecting the time that a graphite piston passes through a fixed volume in a glass tube tightly matched with the graphite piston, and the detection principle and the using method of the instrument are described in detail in Chinese patent CN201720681992.8, which is an online gas flow calibration device for detecting environmental pollution on site.
However, when a dry piston type flow calibration device is used for detecting and calibrating a pulsating air flow source (such as a diaphragm pump), the pulsating air flow can cause the piston to vibrate when falling to the bottom end of the glass tube, thereby affecting the service life and monitoring accuracy of the piston. The bypass is required to have low enough resistance and large enough drift diameter when being opened, so that the pulsating air flow can completely pass through the bypass, and the stable state and the service life of the piston are not influenced when the graphite piston in the main air path rises and falls back. The prior art switching valve provided on the bypass cannot solve the above-mentioned problems.
The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
In order to solve the problems pointed out in the background art, the utility model provides an electromagnetic switching valve and a piston type gas flow calibration system, which are used in a bypass of a dry type piston type gas flowmeter, can ensure the stability of the rising of a piston when detecting the pulsating flow, and can avoid the vibration after falling.
In order to achieve the aim of the utility model, the utility model is realized by adopting the following technical scheme:
the utility model provides an electromagnetic switching valve, comprising:
the valve body comprises a first valve seat, a second valve seat and a valve pipe arranged between the first valve seat and the second valve seat, an inner cavity is formed in the valve body, a detection air inlet nozzle and a switching air inlet nozzle which are communicated with the inner cavity are arranged on the first valve seat, a detection air nozzle and a switching air outlet nozzle which are communicated with the inner cavity are arranged on the second valve seat, the switching air inlet nozzle is used for being connected with an air source to be detected, the detection air inlet nozzle is used for being connected with an air inlet of a piston type air flowmeter for measuring the air flow of the air source to be detected, and the detection air outlet nozzle is used for being connected with an air outlet of the piston type air flowmeter;
a fixed electromagnetic portion provided on the first valve seat and located in the inner cavity;
a movable iron core part movably arranged in the inner cavity, wherein the fixed electromagnetic part is electrified to generate magnetic force so as to drive the movable iron core part to move towards a direction approaching to or away from the second valve seat;
when the moving iron core part moves to a first position in the direction of approaching to the second valve seat, the detected air tap and the switching air tap are plugged, and the air to be detected flows through the switching air tap, the inner cavity, the detecting air tap, the piston type air flowmeter, the detected air tap and the switching air tap;
when the movable iron core part moves to a second position in a direction away from the second valve seat, two ends of the inner cavity are communicated, and the air source to be tested flows out through the switching air inlet nozzle, the inner cavity and the switching air outlet nozzle.
In some embodiments of the present application, a restoring member is disposed on the moving core part, and the restoring member is configured to apply a force to the moving core part to move the moving core part toward the second valve seat.
In some embodiments of the present application, the movable iron core portion includes the iron core, the one end of iron core is equipped with shutoff portion, shutoff portion is used for the shutoff detect the mouth of giving vent to anger with switch the mouth of giving vent to anger, reset piece is the cover and locates spring on the iron core.
In some embodiments of the present application, the blocking portion comprises a connector and a blocking member;
the connecting piece comprises a first connecting part and a second connecting part which are integrally structured, one end of the iron core is provided with a threaded hole, and the first connecting part is arranged in the threaded hole in a threaded manner;
one end of the plugging piece is provided with a second mounting groove, the two connecting parts are in interference fit with each other and are arranged in the second mounting groove, and the other end of the plugging piece is used for plugging the detection air outlet nozzle and the switching air outlet nozzle.
In some embodiments of the present application, the fixed electromagnetic part includes an iron frame, and a permanent magnet and an electromagnetic coil are disposed on the iron frame;
the first valve seat is provided with a first mounting groove towards one side of the inner cavity, the iron frame is fixedly arranged in the first mounting groove, and a mounting hole for the moving iron core part to extend in is formed in the iron frame.
In some embodiments of the present application, a first ventilation cavity is provided in the first valve seat, the first ventilation cavity is communicated with the inner cavity, and the detection air inlet nozzle and the switching air inlet nozzle are both communicated with the first ventilation cavity;
the second valve seat is internally provided with a second ventilation cavity, the second ventilation cavity is communicated with the inner cavity, the detected air tap and the switching air tap are both communicated with the second ventilation cavity, and the movable iron core part is used for blocking and opening the second ventilation cavity.
In some embodiments of the present application, the detection air inlet nozzle and the switching air inlet nozzle are arranged at intervals on the outer peripheral side of the first valve seat;
the detection air tap and the switching air tap are arranged on the outer peripheral side of the second valve seat at intervals.
In some embodiments of the present application, a first step is disposed on an outer peripheral surface of the first valve seat, a second step is disposed on an outer peripheral surface of the second valve seat, the valve tube is sleeved on the first valve seat and the second valve seat, and two ends of the valve tube are correspondingly abutted to the first step and the second step.
In some embodiments of the present application, a reinforcement is disposed between the first valve seat and the second valve seat, and the reinforcement is disposed in plurality along a circumferential direction of the valve tube at intervals.
The utility model also provides a piston type gas flow calibration system which comprises the piston type gas flowmeter and the electromagnetic switching valve.
Compared with the prior art, the utility model has the advantages and positive effects that:
the electromagnetic switching valve in the application is a low-resistance and large-drift-diameter electromagnetic valve, and because the inner diameter of the valve pipe is larger than that of the air inlet nozzle, the air outlet nozzle and the pipeline, the valve pipe has lower resistance, and when the airflow source has pulsation, airflow to be detected can be completely bypassed without causing vibration influence on a piston in a main air path, so that the influence of unstable airflow on the service life of the piston is reduced.
Because the internal diameter of valve pipe is great with air inlet nozzle, air outlet mouth and pipeline internal diameter ratio, when the switching valve is closed and is surveyed the air current source flow that has pulsation, the inner chamber can act as the gas appearance, and the air current gets into the inner chamber of great volume through narrow and small switching air inlet nozzle promptly, and the air current of pulsation can be stabilized, gets into the gas flowmeter later and promotes the piston steady operation, promotes the stability of flow measurement result, reduces the uncertainty.
Other features and advantages of the present utility model will become apparent upon review of the detailed description of the utility model in conjunction with the drawings.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural view of an electromagnetic switching valve (valve tube omitted) according to an embodiment;
FIG. 2 is an exploded view of an electromagnetic switching valve according to an embodiment;
FIG. 3 is a cross-sectional view of the solenoid shift valve in a first position according to an embodiment;
FIG. 4 is a cross-sectional view of the solenoid shift valve in a second position in accordance with an embodiment;
FIG. 5 is a schematic diagram of a piston gas flow calibration system (electromagnetic switch valve open) according to an embodiment;
FIG. 6 is a schematic diagram II of a piston gas flow calibration system (electromagnetic switch valve closed) according to an embodiment;
reference numerals:
100-electromagnetic switching valve, 110-first valve seat, 111-switching air inlet nozzle, 112-detecting air inlet nozzle, 113-first step, 114-first ventilation cavity, 115-first mounting groove, 120-second valve seat, 121-switching air outlet nozzle, 122-detecting air nozzle, 123-second step, 124-second ventilation cavity, 130-fixed electromagnetic part, 131-iron frame, 132-permanent magnet, 133-electromagnetic coil, 140-moving iron core, 141-iron core, 142-blocking part, 1421-connecting piece, 14211-connecting one part, 14212-connecting two parts, 1422-blocking piece, 150-valve tube, 160-O-shaped ring, 170-reinforcing piece and 180-resetting piece;
200-piston type gas flowmeter, 210-piston cylinder, 220-piston, 231-upper infrared transmitting tube, 232-upper infrared receiving tube, 233-lower infrared transmitting tube, 234-lower infrared receiving tube;
300-a pipeline temperature sensor;
400-pipeline pressure sensor;
500-a filter;
600-a controller;
700-an air source to be tested.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The present embodiment discloses a piston type gas flow calibration system, referring to fig. 5, which mainly comprises a piston type gas flowmeter 200, an electromagnetic switching valve 100, a controller 600, and the like.
The piston type gas flowmeter 200 comprises a piston cylinder 210, a piston 220, an infrared detection group and the like.
The infrared detection set includes an infrared transmitting tube and an infrared receiving tube, the infrared receiving tube is used for receiving infrared light emitted by the infrared transmitting tube, and the infrared transmitting tube and the infrared receiving tube are oppositely arranged at the outer side of the piston cylinder 210.
The infrared transmitting tube transmits infrared light with specified frequency after modulation, and as the piston cylinder 210 is transparent, the infrared light emitted by the infrared transmitting tube passes through the piston cylinder 210 and is received by the infrared receiving tube at the other side. The infrared receiving tube can only receive infrared light of a designated frequency to prevent interference of ambient light.
When the piston 220 moves in the piston cylinder 210 but does not pass through the infrared detection group, the infrared receiving tube receives a signal; when the piston 220 passes through the infrared detection set, no signal is received by the infrared receiving tube, and the position signal of the piston 220 is judged according to the signal.
In fig. 5, the infrared detection group has two, and the infrared detection group at the upper part includes an upper infrared emission tube 231 and an upper infrared emission tube 232, and the infrared detection group at the lower part includes a lower infrared emission tube 233 and a lower infrared emission tube 234.
The distance L between two adjacent infrared detection groups is constant, the inner diameter D of the piston cylinder 210 is also a constant value, so that the volume Δv=pi (D/2) of the gas when the piston 220 passes through the two adjacent infrared detection groups 2 L, time is Deltat, flow Q is calculated according to the formula Average of The average gas flow of the piston 220 through the two adjacent infrared detection sets is obtained by = Δv/. DELTA.t.
The embodiments shown in fig. 5 and 6 are only one specific structural form of the piston type gas flowmeter, and in other embodiments, the piston type gas flowmeter with other structural forms can be adopted, and the piston type gas flowmeter is not limited in specific structure.
An electromagnetic switching valve 100 is provided between the air inlet end and the air outlet end of the piston type air flow meter 200. The solenoid switch valve 100 is an electrically driven valve of a gas flow calibration system for controlling the on-off of the bypass.
When the electromagnetic switching valve 100 is opened, the bypass is communicated, the gas flowing out from the gas source 700 to be measured passes through the bypass, and the piston type gas flowmeter 200 is in an idle state, as shown in fig. 5.
When the electromagnetic switching valve 100 is closed, the bypass is disconnected, gas flowing out from the gas source 700 to be tested passes through the piston type gas flowmeter 200, referring to fig. 6, the piston 220 is pushed to move upwards from the bottom of the piston cylinder 210, when the piston 220 passes through the lower infrared transmitting tube 233 and the lower infrared receiving tube 234, the controller 600 starts timing, when the piston 220 continues to move upwards to the upper infrared transmitting tube 231 and the upper infrared receiving tube 232, the controller 600 stops timing, the electromagnetic switching valve 100 is controlled to be opened, the bypass is communicated, the state is returned to the state shown in fig. 5, and the piston 220 falls back to the bottom of the piston cylinder 210 under the action of gravity, so that one-time flow measurement is completed.
The electromagnetic switching valve 100 has a structure shown in fig. 1 to 3, and mainly includes a valve body, a fixed electromagnetic portion 130, a moving core portion 140, and the like.
The valve body includes a first valve seat 110, a second valve seat 120, and a valve tube 150 disposed between the first valve seat 110 and the second valve seat 120, and an inner cavity is formed therein. The first valve seat 110 is provided with a detection air inlet nozzle 112 and a switching air inlet nozzle 111 which are communicated with the inner cavity, and the second valve seat 120 is provided with a detection air outlet nozzle 122 and a switching air outlet nozzle 121 which are communicated with the inner cavity. Referring to fig. 4 again, the switching air inlet nozzle 111 is used for being connected with the air source 700 to be measured, the detecting air inlet nozzle 112 is used for being connected with the air inlet of the piston type air flow meter 200, the detecting air nozzle 122 is used for being connected with the air outlet of the piston type air flow meter 200, and the switching air outlet nozzle 121 is communicated with the atmosphere.
A stationary electromagnetic part 130 is provided on the first valve seat 110 and is located in the inner cavity.
The moving core 140 is movably disposed in the inner cavity, specifically in the inner mounting hole of the fixed electromagnetic portion, and the fixed electromagnetic portion 130 is energized to generate a magnetic force to drive the moving core 140 to move in a direction approaching or separating from the second valve seat 120.
When the moving core 140 moves to the first position in the direction approaching the second valve seat 120, referring to fig. 3, the moving core 140 seals the detected air tap 122 and the switching air tap 121, that is, ends up at one end of the inner cavity, and at this time, the gas flow path in the gas flow calibration system is as shown in fig. 6, the bypass is disconnected, and the air flow to be detected flows through the switching air tap 111, the inner cavity, the detecting air tap 112, the piston type gas flowmeter 200, the detecting air tap 122, and the switching air tap outflow 121.
When the moving core part 140 moves to the second position in a direction away from the second valve seat 120, referring to fig. 4, the moving core part 140 communicates the two ends of the inner cavity, at least opens the switching air outlet nozzle 121, at this time, the gas flow path in the gas flow calibration system is shown in fig. 5, and the gas source to be measured flows out through the switching air inlet nozzle 111, the inner cavity and the switching air outlet nozzle 121 by way of bypass communication.
In this application, the electromagnetic switching valve 100 is in a normally open state, the electromagnetic switching valve 10 is in a second position shown in fig. 4, the bypass channel where the electromagnetic switching valve 100 is located is larger, the resistance is lower, and after the air source to be tested enters the inner cavity through the switching air inlet nozzle 111, the air source to be tested immediately flows out through the switching air outlet nozzle 121, as shown in fig. 5, at this time, no air passes through the piston type air flowmeter 200, and no flow detection operation is performed.
When it is necessary to perform flow measurement, the electromagnetic switching valve 100 is switched to the first position shown in fig. 3, the moving core part 140 is moved in a direction approaching the second valve seat 120 by the driving of the fixed electromagnetic part 130, the bypass is opened, and the air flow source passes through the piston type air flow meter 200, as shown in fig. 6, and flow detection is performed.
The electromagnetic switching valve 100 in the present application is a low-resistance and large-drift electromagnetic valve, and because the inner diameter of the pipe valve 150 is larger than that of the air inlet nozzle, the air outlet nozzle and the pipeline, the valve has lower resistance, and when the airflow source has pulsation, the airflow to be tested can be completely bypassed without vibration influence on the piston in the main air path, thereby reducing the influence of unstable airflow on the service life of the piston.
Because the internal diameter of the valve tube 150 is larger than that of the air inlet nozzle, the air outlet nozzle and the pipeline, when the switching valve is closed to measure the flow of the air flow source with pulsation, the inner cavity can serve as an air volume, namely, the air flow enters the inner cavity with larger volume through the narrow switching air inlet nozzle 111, the pulsating air flow is stabilized, and then enters the air flow meter to push the piston to stably run, so that the stability of the flow measurement result is improved, and the uncertainty is reduced.
In some embodiments of the present application, the moving core 140 is provided with a reset member 180, and the reset member 180 is configured to apply a force to the moving core 140 to move the moving core 140 toward the second valve seat 120, so that the moving core 140 can be maintained in the state shown in fig. 3 after the electromagnetic switching valve is closed.
In some embodiments of the present application, the moving core 140 includes an iron core 141, one end of the iron core 141 is provided with a blocking portion 142, the blocking portion 142 is used for blocking the detected air tap 122 and switching the air tap 121, and the reset piece 180 is a spring sleeved on the iron core 141.
The blocking portion 142 includes a connector 1421 and a blocking member 1422.
The connecting member 1421 includes a first connecting portion 14211 and a second connecting portion 14212, which are integrally formed, and a threaded hole is formed at one end of the core 141, and the first connecting portion 14211 is threaded in the threaded hole.
One end of the blocking piece 142 is provided with a second installation groove, the connecting two parts 14212 are arranged in the second installation groove in an interference mode, and the other end of the blocking piece 142 is used for blocking the detected air tap 122 and the switching air tap 121.
The blocking piece 142 is made of high-elastic silica gel, and the sealing effect is better.
In some embodiments of the present application, the fixed electromagnetic part 130 includes an iron frame 131, a permanent magnet 132 is disposed at the bottom of the iron frame 131, and an electromagnetic coil 133 is disposed at the upper part.
The first valve seat 110 is provided with a first mounting groove 115 at a side facing the inner cavity, the iron frame 131 is fixedly arranged in the first mounting groove 115 through a screw, and a mounting hole for the moving iron core 140 to extend in is formed in the iron frame 131.
When the flow measurement is performed, the controller 600 supplies power to the electromagnetic switching valve 100 in a forward direction instantaneously, the electromagnetic coil 133 wound on the iron frame 131 generates magnetic field force in the opposite direction to the permanent magnet 132, the iron core 141 is ejected, under the action of spring force, the blocking piece 1422 blocks the detected air tap 122 and the switching air tap 121, as shown in fig. 3, at this time, the bypass air path where the electromagnetic switching valve 100 is located is blocked, referring to fig. 6, the air flow to be measured enters the flowmeter through the switching air tap 111, the inner cavity and the detecting air tap 112, the piston 220 is pushed to move upwards to start flow detection, when the piston 220 moves to the position where the infrared detecting group is located at the upper part, the detection process is finished, then the controller 600 supplies power to the electromagnetic switching valve 100 in a reverse direction instantaneously, the magnetic field force in the same direction as the permanent magnet 132 is generated by the electromagnetic coil 133 wound on the iron frame 131, the iron core 141 is sucked into the round hole in the iron frame 131, and kept in a sucked state by the permanent magnet 132, the normally opened state of the electromagnetic switching valve 100 is restored, and the air flow to be measured is immediately discharged through the switching air tap 121 after entering the inner cavity through the switching air tap 111, and the flow measurement is completed.
The switching valve uses a single-holding push-pull electromagnet, the opening and closing states of the switching valve are respectively held by the permanent magnet 132 and the spring, continuous power supply is not needed to keep the working state, and the switching valve only needs to be powered instantaneously when switching the opening and closing states, so that the use power consumption is reduced.
The fixed electromagnetic part 130 is arranged inside the valve body, and heat generated by heating of the electromagnetic coil 133 can be taken away when bypass air passes through, so that an effective heat dissipation effect is achieved, the influence of temperature rise on weakening of magnetic force of the permanent magnet 132 is improved, and the service life of the electromagnetic switching valve 100 is prolonged.
In some embodiments of the present application, a first ventilation chamber 114 is disposed in the first valve seat 110, the first ventilation chamber 114 is in communication with the inner cavity, and the detection air inlet nozzle 112 and the switching air inlet nozzle 111 are both in communication with the first ventilation chamber 114.
The second valve seat 120 is internally provided with a second ventilation cavity 124, the second ventilation cavity 124 is communicated with the inner cavity, the detection air outlet nozzle 122 and the switching air outlet nozzle 121 are both communicated with the second ventilation cavity 124, and the movable iron core part 140 is used for plugging and opening the second ventilation cavity 124, namely plugging and opening the detection air outlet nozzle 122 and the switching air outlet nozzle 121 are realized.
In some embodiments of the present application, the detecting air inlet nozzle 112 and the switching air inlet nozzle 111 are disposed at intervals on the outer peripheral side of the first valve seat 110, and the detecting air inlet nozzle 112 and the switching air inlet nozzle 111 are vertically distributed. The detecting air tap 122 and the switching air tap 121 are arranged at intervals on the outer peripheral side of the second valve seat 120, and are also vertically distributed. Two gas circuit connectors vertically distributed on the same side are convenient for connecting pipes of the pipeline.
In some embodiments of the present application, the valve tube 150 is transparent to facilitate viewing of the movement of the various components within.
The first step 113 is arranged on the outer circumferential surface of the first valve seat 110, the second step 123 is arranged on the outer circumferential surface of the second valve seat 120, and the valve tube 150 is sleeved on the first valve seat 110 and the second valve seat 120 and is sealed through the O-shaped ring 160.
The two ends of the valve tube 150 are correspondingly abutted against the first step 113 and the second step 123, so that the structural stability is improved, and the left-right movement of the valve tube 150 is avoided.
In some embodiments of the present application, a reinforcement 170 is disposed between the first valve seat 110 and the second valve seat 120, the reinforcement 170 is of an elongated sheet structure, and the reinforcement 170 is disposed along a plurality of circumferential intervals of the valve tube 150, so as to prevent the valve tube 150 from being separated from the two valve seats during operation, and ensure the tightness and reliability of the electromagnetic switching valve 100 as a whole.
In some embodiments of the present application, the air inlet pipeline of the piston type air flow meter 200 is provided with a pipeline pressure sensor 400, a pipeline temperature sensor 300 and a filter 500.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. An electromagnetic switching valve, characterized by comprising:
the valve body comprises a first valve seat, a second valve seat and a valve pipe arranged between the first valve seat and the second valve seat, an inner cavity is formed in the valve body, a detection air inlet nozzle and a switching air inlet nozzle which are communicated with the inner cavity are arranged on the first valve seat, a detection air nozzle and a switching air outlet nozzle which are communicated with the inner cavity are arranged on the second valve seat, the switching air inlet nozzle is used for being connected with an air source to be detected, the detection air inlet nozzle is used for being connected with an air inlet of a piston type air flowmeter for measuring the air flow of the air source to be detected, and the detection air outlet nozzle is used for being connected with an air outlet of the piston type air flowmeter;
a fixed electromagnetic portion provided on the first valve seat and located in the inner cavity;
a movable iron core part movably arranged in the inner cavity, wherein the fixed electromagnetic part is electrified to generate magnetic force so as to drive the movable iron core part to move towards a direction approaching to or away from the second valve seat;
when the moving iron core part moves to a first position in the direction of approaching to the second valve seat, the detected air tap and the switching air tap are plugged, and the air to be detected flows through the switching air tap, the inner cavity, the detecting air tap, the piston type air flowmeter, the detected air tap and the switching air tap;
when the movable iron core part moves to a second position in a direction away from the second valve seat, two ends of the inner cavity are communicated, and the air source to be tested flows out through the switching air inlet nozzle, the inner cavity and the switching air outlet nozzle.
2. The electromagnetic switching valve according to claim 1, wherein,
the movable iron core part is provided with a reset piece, and the reset piece is used for applying acting force for enabling the movable iron core part to move towards the second valve seat to the movable iron core part.
3. The electromagnetic switching valve according to claim 2, wherein,
the movable iron core part comprises an iron core, one end of the iron core is provided with a blocking part, the blocking part is used for blocking the detection air outlet nozzle and the switching air outlet nozzle, and the reset piece is a spring sleeved on the iron core.
4. The electromagnetic switching valve according to claim 3, wherein,
the plugging part comprises a connecting piece and a plugging piece;
the connecting piece comprises a first connecting part and a second connecting part which are integrally structured, one end of the iron core is provided with a threaded hole, and the first connecting part is arranged in the threaded hole in a threaded manner;
one end of the plugging piece is provided with a second mounting groove, the two connecting parts are in interference fit with each other and are arranged in the second mounting groove, and the other end of the plugging piece is used for plugging the detection air outlet nozzle and the switching air outlet nozzle.
5. The electromagnetic switching valve according to any one of claims 1 to 4, wherein,
the fixed electromagnetic part comprises an iron frame, and a permanent magnet and an electromagnetic coil are arranged on the iron frame;
the first valve seat is provided with a first mounting groove towards one side of the inner cavity, the iron frame is fixedly arranged in the first mounting groove, and a mounting hole for the moving iron core part to extend in is formed in the iron frame.
6. The electromagnetic switching valve according to any one of claims 1 to 4, wherein,
a first ventilation cavity is arranged in the first valve seat and is communicated with the inner cavity, and the detection air inlet nozzle and the switching air inlet nozzle are communicated with the first ventilation cavity;
the second valve seat is internally provided with a second ventilation cavity, the second ventilation cavity is communicated with the inner cavity, the detected air tap and the switching air tap are both communicated with the second ventilation cavity, and the movable iron core part is used for blocking and opening the second ventilation cavity.
7. The electromagnetic switching valve according to claim 6, wherein,
the detection air inlet nozzle and the switching air inlet nozzle are arranged on the outer peripheral side of the first valve seat at intervals;
the detection air tap and the switching air tap are arranged on the outer peripheral side of the second valve seat at intervals.
8. The electromagnetic switching valve according to any one of claims 1 to 4, wherein,
the outer peripheral surface of the first valve seat is provided with a first step, the outer peripheral surface of the second valve seat is provided with a second step, the valve tube is sleeved on the first valve seat and the second valve seat, and two ends of the valve tube are correspondingly abutted to the first step and the second step.
9. The electromagnetic switching valve according to any one of claims 1 to 4, wherein,
and a plurality of reinforcements are arranged between the first valve seat and the second valve seat at intervals along the circumferential direction of the valve pipe.
10. A piston gas flow calibration system comprising a piston gas flow meter, further comprising an electromagnetic switching valve according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223018957.8U CN218955880U (en) | 2022-11-14 | 2022-11-14 | Electromagnetic switching valve and piston type gas flow calibration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223018957.8U CN218955880U (en) | 2022-11-14 | 2022-11-14 | Electromagnetic switching valve and piston type gas flow calibration system |
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| CN218955880U true CN218955880U (en) | 2023-05-02 |
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| CN202223018957.8U Active CN218955880U (en) | 2022-11-14 | 2022-11-14 | Electromagnetic switching valve and piston type gas flow calibration system |
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| CN (1) | CN218955880U (en) |
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