CN212868573U

CN212868573U - Rotary valve for gas sampling

Info

Publication number: CN212868573U
Application number: CN202021254347.6U
Authority: CN
Inventors: 李杭; 王东鉴
Original assignee: Shenzhen Berui Biotechnology Co ltd
Current assignee: Shenzhen Berui Biotechnology Co ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-04-02
Anticipated expiration: 2030-07-01

Abstract

The utility model provides a rotary valve for gas sampling. The utility model discloses a: valve body, motor support frame and have gas passage's main body frame, the one end and the motor intercommunication of valve body, the other end stretch into main body frame, the through-hole phase-match that this end and main body frame seted up, motor detachably connect on motor support frame, motor support frame and main body frame fixed connection, the valve body includes first steering valve, sets up a through-hole that link up it on it, and this through-hole diameter and gas passage's diameter phase-match, first steering valve opens and is equipped with the waste gas derivation face, and arbitrary point non-intersect on this face and the through-hole of first steering valve. The utility model discloses a first steering valve rotation angle of motor drive to make the gas that control was gathered get into waste gas pipeline or collection pipeline, compare with current solenoid valve control, the utility model discloses whole light in weight, enough miniaturization, modularization are fit for extensively promoting in gas sampling technical field.

Description

Rotary valve for gas sampling

Technical Field

The utility model relates to a gaseous detection technology field especially relates to a rotary valve for gas sampling.

Background

The gas sampling technology collects gas through a gas sampling device, and after the gas is collected to a fixed vessel, the components and unknown substances in the gas are determined through a detection instrument. The reasonable collection of the sample is very important for the whole inspection link, and the accuracy of the final analysis result is directly influenced.

In both the collection of industrial gas samples such as chemical waste gas and the like and the collection of respiratory gas of people, in some experiments, the gas samples are not completely collected, some waste gas irrelevant to detection may exist and needs to be eliminated, and the human respiratory gas is taken as a reflecting way of the health condition of the human body and can reflect some important pathological symptoms, so the human exhaled gas can be used for various medical diagnosis technologies including exhaled gas analysis. The exhaled air is mainly composed of two parts, one part is "dead space air" from the upper respiratory tract, which is not exchanged with blood, and the other part is air from the deep part of the alveoli, which is exchanged with blood, and is called "alveolar air", which is about 150 ml. The main object of respiratory gas research is alveolar gas, and dead space gas can dilute the concentration of disease markers in the alveolar gas and also influence the effectiveness of respiratory gas analysis.

For example, CN205228882U, "an end-expiratory sampling device" ensures quantitative collection of collected gas through cooperation of a first two-way valve and a second two-way valve, and "an expiratory analysis device and a use method" with a publication number of CN 110226931 a adopts multiple valves including a "three-way valve", "a first valve", and a second valve "to control, so that a solenoid valve with a larger channel has a larger heat value, a larger overall weight, is inconvenient to carry, and is not light-weighted and small-sized, and meanwhile, a large number of valves means that a subject in a valve body has more gas residues, and the collected data of the next subject is inaccurate.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned problems, a rotary valve for gas sampling is provided. The utility model discloses main integrated level is high, effectively reduces the whole weight of device. The utility model discloses a technical means as follows:

a rotary valve for gas sampling comprising: valve body, motor support frame and have gas passage's main body frame, the one end and the motor intercommunication of valve body, the other end stretches into in the main body frame, the through-hole phase-match that this end and main body frame seted up, motor detachably connects on the motor support frame, motor support frame and main body frame fixed connection, the valve body includes first diverter valve, sets up a through-hole that link up it on it, and this through-hole diameter and gas passage's diameter phase-match, at least one waste gas derivation face has been seted up to first diverter valve, and any point non-intersect on waste gas derivation face and the through-hole of first diverter valve.

Further, the first steering valve is shaped as a cylinder cut longitudinally by a plane.

The gas inlet side of the gas passage is close to the gas inlet side of the gas passage, the gas outlet side of the gas passage is close to the second steering valve, a through hole penetrating the second steering valve is formed in the position, corresponding to the first steering valve, of the second steering valve, and the main body of the second steering valve is cylindrical.

Furthermore, one end of the first steering valve, which extends into the main body frame, is provided with a positioning hole, the steering valve further comprises a detection mechanism, the main body frame is provided with a groove for accommodating the detection mechanism, the detection mechanism is used for emitting light under the control of an external electric control device, and the rotation state of the first steering valve is recognized based on the state that the light penetrates through the positioning hole.

Furthermore, the positioning hole of the first steering valve comprises an air path positioning hole and an angle positioning hole, the air path positioning hole is perpendicular to the through hole of the first steering valve in space, the air path positioning hole penetrates through the cutting surface of the air path positioning hole and has a certain distance with the air path channel of the first steering valve, and a preset angle is formed between the angle positioning hole and the air path positioning hole.

Furthermore, one end of the second steering valve, which extends into the main body frame, is provided with a positioning hole, the second detection mechanism emits light under the control of the external electric control device, and recognizes the rotation state of the second steering valve based on the state that the light penetrates through the positioning hole, and the positioning hole of the second steering valve is mutually perpendicular to the through hole of the second steering valve in space.

Furthermore, a slotted hole is arranged on one side of the valve body connected with the motor, a rotating shaft is embedded between the slotted hole and the valve body, the outer diameter of the rotating shaft is matched with the inner diameter of the slotted hole of the valve body, and the rotating shaft is connected with the motor.

Furthermore, the material of the rotating shaft is the same as or different from that of the valve body, and the material of the valve body is the same as or different from that of the main body frame, and when the material of the valve body is the same as that of the main body frame, the material of the valve body is rigid; at different times, the valve body is made of flexible materials, and the rotating shaft and the main body frame are made of rigid materials.

The utility model discloses a first steering valve rotation angle of motor drive to make the gas that control was gathered get into waste gas pipeline or collection pipeline, compare with current solenoid valve control, the utility model discloses whole light in weight, enough miniaturization, modularization are suitable extensively promoting in gas sampling technical field.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic view of the main structure of the present invention.

Fig. 2 is an explosion diagram of the present invention.

Fig. 3 is a schematic structural view of the device for collecting exhaled breath of the present invention.

In the figure: 103. an exhaled air inlet; 104. a blowing nozzle; 201. CO 2₂A sensor; 202. a flow/velocity sensor; 3. rotating the valve; 301. a photoelectric coupler; 302. a first steering valve; 303. a main body frame; 304. a first motor; 305. a motor support frame; 306. assembling a nut; 401. a sampler self-locking joint; 501. a micro air pump; 502. a back-blowing mechanism filter; 503. the trachea connects the joint.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the present embodiment discloses a rotary valve 3 for gas sampling, including: valve body, motor support frame and the main body frame 303 that has the gas passage, the one end and the first motor 304 intercommunication of valve body, the other end stretch into main body frame, the through-hole phase-match that this end and main body frame seted up, first motor detachably connects on motor support frame 305, motor support frame passes through fitting nut 306 fixed connection with main body frame, the valve body includes first diverter valve 302, sets up a through-hole that link up it on it, and this through-hole diameter and gas passage's diameter phase-match, at least one waste gas derivation face has been seted up to first diverter valve, and any point non-intersect on waste gas derivation face and the through-hole of first diverter valve. The first diverter valve is in the shape of a cylinder which is longitudinally cut by a plane, namely an exhaust gas outlet surface, and the exhaust gas outlet surface can also be in other practical shapes.

The one end that first steering valve stretched into main body frame has seted up the locating hole, still includes detection mechanism, main body frame sets up the recess that holds detection mechanism, detection mechanism is used for emitting light under outside electrically controlled device's control to the rotation state of first steering valve is discerned based on the state that this light pierces through the locating hole, and in this embodiment, detection mechanism chooses for use photoelectric coupler 301.

In an alternative embodiment, the number of exhaust gas discharge surfaces is one or two, and in the case of two, the two cutting planes are arranged symmetrically, i.e. in an oblong shape, with respect to a longitudinal section of the cylinder through the center of the circle. If the cutting surface is cut by two planes, the number of the positioning holes can be one, if the cutting surface is cut by one plane, the number of the positioning holes is at least two, the second positioning hole and the first positioning hole are on the same plane and have preset angles, in other optional embodiments, the number of the positioning holes can be more, the positioning is more accurate, for example, the third positioning hole is perpendicular to the first positioning hole in space, the distance between the second positioning hole and the first positioning hole is different, namely, the second positioning hole is arranged on one side close to the cutting surface or on the cylindrical main body close to the non-cutting surface.

According to different use conditions, the rotary valve can be divided into two following structure forms, wherein the A-form rotary valve part comprises a rigid main body part and a valve body capable of rotating in the main body part, the main body part is provided with a longitudinal gas passage, the lowest end of the longitudinal gas passage is a gas collecting mechanism, the valve body comprises a first steering valve, the sampler self-locking joint 401 connected below the rotary valve can be a quick joint, one end of the first steering valve is connected with a first motor, and the other side of the first steering valve is provided with a positioning hole. The positioning hole of the first steering valve comprises an air path positioning hole and an angle positioning hole, the air path positioning hole is perpendicular to the through hole of the first steering valve in space, the air path positioning hole penetrates through a cutting surface of the air path positioning hole and has a certain distance with the air path channel of the first steering valve, and a preset angle is formed between the angle positioning hole and the air path positioning hole. Meanwhile, a blowback gas passage of the following B form may be provided.

The B-form rotary valve part comprises a rigid main body part and a valve body capable of rotating in the main body part, wherein the main body part is provided with a longitudinal gas passage and a transverse back-blowing gas passage, the back-blowing gas passage is communicated with the longitudinal gas passage, and the bottommost end of the longitudinal gas passage is a gas collecting mechanism. The valve body comprises a first steering valve and a second steering valve, wherein the first steering valve is arranged between the upper longitudinal gas passage and the back-blowing gas passage, the second steering valve is arranged between the back-blowing gas passage and the lower longitudinal gas passage, one end of the first steering valve is connected with the first motor, and one end of the second steering valve is connected with the second motor.

And a through hole penetrating through the second steering valve is formed in the position, corresponding to the first steering valve, of the second steering valve, and the main body of the second steering valve is cylindrical. The end of the second steering valve, which extends into the main body frame, is provided with a positioning hole, the second detection mechanism emits light under the control of the external electric control device and recognizes the rotation state of the second steering valve based on the state that the light penetrates through the positioning hole, and the positioning hole of the second steering valve is mutually vertical to the through hole of the second steering valve in space. In order to facilitate fine adjustment of the rotation angle of the rotary valve body, a gear reduction motor is used as a motor for driving the steering valve in the embodiment, and the specific reduction ratio can be selected according to actual conditions, for example, two models of 1:380 and 1:1000 are selected in the embodiment.

The rotary valve body and the main body are made of the same or different materials. If different, then the main part can select for use pk material (polyketone), as supporting the stator, and the plastics material is selected for use to the rotary valve body, as the rotor, and its one side that links to each other with the motor is inlayed and is had the pivot of metal material, and the external diameter of pivot and the slotted hole internal diameter of plastics valve body match, in this embodiment, select for use copper as the rotor, and the pivot of metal material can also effectively prevent the lubricating oil inflow gas passage of motor when guaranteeing sufficient rigidity. If the same, other feasible materials including ceramics may be selected.

As shown in fig. 3, in order to use in the exhaled breath collection device the utility model discloses an example, explains whole sampling flow, and wherein, exhaled breath collection device includes gaseous detection mechanism and host processor, the utility model provides a rotary valve 3 installs between gaseous detection mechanism and gaseous collection mechanism, gaseous detection mechanism includes CO₂A sensor 201 and/or a flow sensor 202, wherein the subject is arranged with the mouthpiece 104 and exhales into the device, and the exhaled air enters from the exhaled air inlet 103 and passes through the CO₂After the sensor and/or the flow sensor, the main processor determines whether the exhaled air is dead space air or alveolar air according to a preset standard, and if the exhaled air is dead space air, the exhaled air flows out of the device along the air passage and the plane of the first steering valve; if the air is alveolar air, the main processor controls the first rotary valve to rotate to form a passage for collecting the air.

Specifically, in this embodiment, the processor may select an STM32 embedded low power consumption chip based on an ARM core, and the carbon dioxide sensor adopts a non-dispersive infrared principle, where the models are C500 and C600. In the above steps, the judgment of the acquisition mode has various modes:

a) when the concentration of the carbon dioxide is higher than the designated threshold value, the rotary valve rotates to realize the collection of the exhaled air, and the concentration threshold value can be set to be 2%.

b) And integrating the time and the flow velocity by using the flow velocity sensor, so that the flow can be acquired. Setting the volume of the evacuated gas flow to be 500-1000 mL

c) The rotation of the rotary valve is judged simultaneously by the flow rate and the carbon dioxide concentration. I.e. the flow rate is in the range of 3L/min to 4L/min and the carbon dioxide concentration is higher than 2%, the selection of the rotary valve is performed. And to execute the acquisition program.

In order to prevent the residual gas in the gas channel from interfering the next subject, the expired gas collecting device also comprises a back-blowing mechanism, at the moment, a back-blowing pipeline is arranged on the main body framework, and the first steering valve is arranged between the upper longitudinal gas passage and the back-blowing gas passage; the second steering valve of the scheme B is arranged between a back-blowing gas passage and a lower longitudinal gas passage, the back-blowing mechanism comprises a micro air pump 501, an air outlet of the micro air pump is connected with the back-blowing gas passage through an air pipe connecting joint 503, and a back-blowing mechanism filter 502 for purifying air is also arranged between the back-blowing gas passage and the back-blowing mechanism filter. Before the next test person exhales, the miniature air pump is started, the air path of the first rotary valve is longitudinal, the air path of the second rotary valve in the scheme B is transverse, and residues in the air channel are rapidly removed.

The utility model discloses use in embodiment 1 of exhaled breath collection device specifically to use includes following step: step 1, before the device is used, the device is reset through the LED screen, namely the flat side of the first rotary valve is upward, the micro air pump of the back flushing mechanism is closed, and other electrical components are in a standby state. Step 2, in CO₂Detecting whether the exhaled air is dead space air or alveolar air under the detection of the sensor and/or the flow sensor, and if the exhaled air is dead space air, enabling the exhaled air to flow out of the device along the plane of the air passage and the first steering valve; if the air is alveolar air, the main processor controls the first rotary valve to form a passage for collecting the air. And 3, removing the gas collection bag, starting the micro air pump before the next subject exhales, enabling the gas path of the first rotary valve to be longitudinal, and taking the quick connector as a plug to discharge residual gas in the gas path.

The utility model discloses use in embodiment 2 of exhaled breath collection device specifically to use includes following step: step 1, before the device is used, the device is reset through the LED screen, namely the flat side of the first rotary valve is upward, the air hole of the second rotary valve is in a longitudinal (or transverse) state, the micro air pump of the back flushing mechanism is closed, and other electrical components are in a standby state. Step 2, in CO₂Detecting whether the exhaled air is dead space air or alveolar air under the detection of the sensor and/or the flow sensor, and if the exhaled air is dead space air, enabling the exhaled air to flow out of the device along the plane of the air passage and the first steering valve; if the air is alveolar air, the main processor controls the first rotary valve and the second rotary valve to form a passage for collecting the air. Step 3, before the next subject exhales, the miniature air pump is started,the gas path of the first rotary valve is longitudinal, and the gas path of the second rotary valve is transverse, so that residual gas in the gas path is discharged.

During it, detect first rotary valve, the specific gesture of second rotary valve through optoelectronic coupler, specifically, the rotary valve slowly rotates under the drive of motor, when optoelectronic coupler detected the light path, prove that first rotary valve is in the through-hole horizontal position, the rotary valve continues to rotate, if detect the light path again in the time of predetermineeing, then prove to have passed through the angle locating hole, judge that the through-hole horizontal position that the rotary valve was in before from this is that the cylinder upwards or the plane upwards, confirm the gesture of first rotary valve from this.

The method of stopping the acquisition also includes different schemes, in particular,

after the acquisition procedure is performed, the rotary valve is switched on, and the exhaled air flows into the exhaled air sampling air bag through the rotary valve.

At this time, the flow rate is determined by the flow rate sensor. Determined according to the air bag accommodation volume. Typically, a 2L air bag volume is selected and a 1L sample air bag fill volume.

After entering the collection mode, the rotary valve is rotated when the gas volume exceeds 1L by the flow sensor. This time in non-acquisition mode. The exhaled air cannot be filled into the air bag.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A rotary valve for sampling gas, comprising: valve body, motor support frame and have gas passage's main body frame, the one end and the motor intercommunication of valve body, the other end stretches into in the main body frame, the through-hole phase-match that this end and main body frame seted up, motor detachably connects on the motor support frame, motor support frame and main body frame fixed connection, the valve body includes first diverter valve, sets up a through-hole that link up it on it, and this through-hole diameter and gas passage's diameter phase-match, at least one waste gas derivation face has been seted up to first diverter valve, and any point non-intersect on waste gas derivation face and the through-hole of first diverter valve.

2. The rotary valve for gas sampling according to claim 1, wherein the first diverter valve is shaped as a cylinder cut longitudinally by a flat surface.

3. The rotary valve for gas sampling according to claim 1, further comprising a second direction changing valve, wherein the first direction changing valve is located near an inlet side of the gas passage, the second direction changing valve is located near an outlet side of the gas passage, the second direction changing valve has a through hole formed therethrough at a position corresponding to the first direction changing valve, and the second direction changing valve has a cylindrical shape.

4. A rotary valve for sampling gas according to any one of claims 1 to 3, wherein the end of the first diverter valve extending into the main frame defines at least one positioning hole, and further comprising a detection mechanism, the main frame defines a recess for receiving the detection mechanism, the detection mechanism is configured to emit light under the control of the external electrical control device, and to recognize the rotation state of the first diverter valve based on the state of the light penetrating through the positioning hole.

5. The rotary valve for sampling gas according to claim 4, wherein the positioning hole of the first direction changing valve includes an air passage positioning hole and an angle positioning hole, the air passage positioning hole is spatially perpendicular to the through hole of the first direction changing valve, the air passage positioning hole penetrates a cutting surface thereof and is spaced apart from the air passage of the first direction changing valve, and a predetermined angle is formed between the angle positioning hole and the air passage positioning hole.

6. The rotary valve for gas sampling according to claim 4, wherein a positioning hole is formed at an end of the second direction changing valve extending into the body frame, the second detecting means emits light under the control of the external electric control device and recognizes the rotation state of the second direction changing valve based on a state where the light penetrates the positioning hole, and the positioning hole of the second direction changing valve and the through hole of the second direction changing valve are spatially perpendicular to each other.

7. The rotary valve of claim 1, wherein a slot is formed at a side of the valve body connected to the motor, and a rotation shaft is inserted therein, an outer diameter of the rotation shaft is matched with an inner diameter of the slot of the valve body, and the rotation shaft is connected to the motor.

8. The rotary valve according to claim 7, wherein the rotary shaft and the valve body are made of the same or different materials, and the valve body and the main frame are made of the same or different materials, and are made of rigid materials when the materials are the same; at different times, the valve body is made of flexible materials, and the rotating shaft and the main body frame are made of rigid materials.