A multi-channel high-pressure valve capable of detecting liquids

Abstract

The present invention discloses a multi-channel high-pressure valve capable of detecting liquids, which includes a torsion power component, a valve body, a valve head, and a valve core arranged in the valve body. The torsion power component outputs torque as a power component, drives the coupling, rotates the conversion head, and switches the different interfaces of the multi-channel high-pressure valve. The middle interface of the valve head is rotated and stopped at different positions through the conversion head, and can be connected to the upper interface of the valve head, or the left interface of the valve head, or closed circuit without any connection; the left interface of the valve head is connected to a quartz glass tube and an optical detection connector, and has the function of liquid detection in conjunction with an optical detection circuit board. The present invention solves the problems existing in the liquid flow path used in the current automatic online water quality analyzer using a chemical method, reduces the problem of dead volume contamination of reagents in the pipeline, and ensures the accuracy and stability of liquid quantitative measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring, and in particular to a multi-channel high-pressure valve capable of detecting liquid. Background Art

[0002] The lower high-pressure valve is a key component of the digestion unit in the chemical water quality analyzer. The water sample inlet, mixing, digestion and emptying in the digestion tube of the analyzer need to pass through the lower high-pressure valve node to control the on-off circuit. At present, most domestic manufacturers of continuous automatic online monitoring analyzers of water quality use diaphragm valves for the lower high-pressure valves. The function of the lower high-pressure valve in the water quality analyzer is to cut off and conduct the lower port pipeline of the digestion tube, so that the digestion tube of the instrument can take different reagents or water samples respectively, and discharge the waste liquid and cleaning waste water after analysis; when there is no liquid in or out, especially when the liquid in the digestion tube is in the digestion reaction, the lower high-pressure valve needs to be closed, that is, the passage between the digestion tube and the pipeline is cut off. Its functional position in the analyzer determines that the valve core of the lower high-pressure valve needs to have extremely high chemical stability, safe and reliable use, stable performance, and the valve core cannot be pushed open when digesting high pressure. When the valve needs to be opened, it can also be opened stably under a certain pressure. The high-pressure valve is one of the indispensable core components of the chemical water quality analyzer.

[0003] like Figure 1 As shown, currently, the most widely used and most common low-pressure valve on the market is the electromagnetic diaphragm valve, whose valve body is generally made of polytetrafluoroethylene, and the valve core diaphragm 2 is made of perfluoroether rubber. The structure of the electromagnet (including the moving iron core 3, the electromagnetic coil 5, and the fixed iron core 6) and the spring 4 is used to drive the diaphragm 2 and the valve body 1 to achieve the opening and closing of the valve core.

[0004] The disadvantages of the existing solutions are:

[0005] (1) This solution has a dead volume between the diaphragm and the valve body, which cannot completely drain the liquid passing through the valve. As a result, the contamination problem between the residual liquid and the newly taken reagent cannot be eliminated, which becomes an important reason affecting the accuracy of the water quality analyzer.

[0006] (2) This solution does not have the liquid detection function and requires an additional liquid detection module. In the mode of cooperating with the liquid detection module, there will be a long pipeline between the valve body and the liquid level sensor. Every time the liquid is taken and measured, there is air in this pipeline. Air is an elastic body. Taking liquids with different densities will cause the liquid volume to fluctuate, resulting in a large system error and affecting the accuracy of the analyzer.

[0007] (3) This solution places high demands on the chemical resistance and mechanical fatigue life of the diaphragm material, which makes the processing and manufacturing of the diaphragm difficult. Because the diaphragm has to withstand various chemical reagents such as strong acids, strong bases, and strong oxidation, it is generally made of perfluoroether rubber with excellent chemical resistance. However, perfluoroether rubber will harden at relatively low temperatures below 10°C and is very likely to rupture and fail under repeated pulling conditions.

[0008] The number of valve core channels in this solution is limited, and it can only achieve two-position and two-way. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a multi-channel high-pressure valve capable of detecting liquids, which can achieve higher liquid extraction accuracy, higher low-temperature stability and longer service life.

[0010] The purpose of the present invention is achieved through the following technical solutions:

[0011] A multi-channel high-pressure valve capable of detecting liquid, the multi-channel high-pressure valve comprising:

[0012] Torsion power components;

[0013] A valve body, fixedly connected to the torsional power component;

[0014] A valve head, fixedly connected to the valve body, wherein the valve head is provided with a first flow channel, a second flow channel and a third flow channel;

[0015] The valve core is located in the valve body, and includes a conversion head and a grinding head. The grinding head is tightly attached to the valve head, and is provided with a central through hole and two connecting through holes which are respectively connected with the first flow channel, the second flow channel and the third flow channel one by one; a guide groove extending radially outward from the center position is provided on a surface of the conversion head facing the grinding head, which is used to conduct the central through hole and the connecting through holes; the conversion head is circumferentially fixed to the rotor of the torsional power component through a coupling; an induction plate, a code disk, an elastic pressing piece and a bearing are arranged between the coupling and the rotor of the torsional power component, and the coupling, the conversion head and the grinding head are pressed against the valve head in turn through the elastic pressing piece; the code disk is fixed on the coupling, and the induction plate is fixed on the valve body;

[0016] The valve head also includes an optical detection connector, a quartz glass tube, and an optical detection circuit board that cooperate with the third channel to realize liquid detection; the quartz glass tube is located in the third flow channel, the optical detection connector is used to connect to an external power device, and the optical detection circuit board is fixed on the valve head to determine whether liquid has entered the quartz glass tube; the second flow channel of the valve head is a metering flow channel with a fixed pipeline length.

[0017] Furthermore, the valve core also includes a sealing gasket arranged between the valve head and the grinding head, and the sealing gasket is provided with through holes corresponding to the central through hole of the grinding head and the multiple connecting through holes.

[0018] Furthermore, both ends of the quartz glass tube are provided with O-rings, and the optical inspection connector is provided with an external threaded interface.

[0019] Furthermore, the elastic pressing member is preferably a disc spring.

[0020] Furthermore, the optical inspection circuit board is provided with lamp beads and photocells. When the quartz glass tube is in two different states of liquid or no liquid, the light emitted by the lamp beads is refracted by the liquid or air in the quartz glass tube. The photocells on the optical inspection circuit board will receive different amounts of light in the two different states of liquid and no liquid, and output high and low potential signals with large differences to determine whether there is liquid in the quartz glass tube.

[0021] Furthermore, the torsional power component is a reduction motor.

[0022] Furthermore, the conversion head and the grinding head are both made of ceramic materials.

[0023] Furthermore, the valve head is made of engineering plastics.

[0024] Furthermore, the sealing gasket and O-ring are made of corrosion-resistant rubber material.

[0025] The beneficial effects of the present invention are as follows:

[0026] (1) The present invention integrates a high-pressure valve and a liquid detection module, which greatly improves the stability and accuracy of liquid measurement, and has a reasonable structure, a compact size, and a high degree of integration.

[0027] (2) The valve core structure of the present invention has no dead volume, and the pipeline can be emptied when taking and discharging liquid, which will not cause reagent contamination during secondary liquid taking. In addition, the liquid level sensor module has an ingenious structure, is stable and reliable, and has a low false alarm rate.

[0028] (3) The light-transmitting part of the liquid level sensor module of the present invention is made of quartz glass, and impurities are not easily adhered to the inner wall, which is easy to clean and simple to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of a high pressure valve in the prior art;

[0030] Figure 2 It is a structural schematic diagram of a multi-channel high-pressure valve capable of detecting liquids according to the present invention;

[0031] Figure 3 It is a schematic diagram of the valve core structure of the multi-channel high-pressure valve capable of detecting liquid of the present invention;

[0032] In the figure, valve body 1, diaphragm 2, moving iron core 3, spring 4, electromagnetic coil 5, fixed iron core 6, valve head 7, sealing gasket 8, grinding head 9, conversion head 10, induction plate 11, induction plate cover 12, coupling 13, code disk 14, disc spring 15, valve body 16, bearing 17, reduction motor 18, O-ring 19, quartz glass tube 20, optical inspection circuit board 21, optical inspection connector 22, grinding head digestion tube connecting hole 9-1, grinding head center hole 9-2, grinding head optical inspection connecting hole 9-3, conversion head guide groove 10-1, optical inspection circuit board lamp bead 21-1, optical inspection circuit board photocell 21-2. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more clear. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] like Figure 2 and Figure 3 As shown, the multi-channel high-pressure valve capable of detecting liquid in this embodiment includes a reduction motor 18, a valve body 16, a valve head 7 and a valve core.

[0035] The high pressure valve of this embodiment is a multi-way valve, which is typically designed as a three-way valve. The number of channels can also be set according to actual needs. This embodiment is described by taking three channels as an example. Figure 2 As shown in view AA, the valve body 16 is fixedly connected to the reduction motor 18, and the valve head 7 is fixedly connected to the valve body 16. The valve head 7 is provided with an upper flow channel, a middle flow channel and a left flow channel, all of which are provided with external interfaces. The valve core is located in the valve body 16, including a conversion head 10 and a grinding head 9. The grinding head 9 is tightly attached to the valve head 7 through a sealing gasket 8. The grinding head digestion tube connection hole 9-1 provided on the grinding head 9 corresponds to the interface of the upper flow channel of view AA, and is used to correspond to the bottom end face of the digestion tube of the chemical method water quality analysis instrument; the grinding head center hole 9-2 corresponds to the interface of the middle flow channel of view AA, and the grinding head optical inspection connection hole 9-3 corresponds to the left interface of view AA. The sealing gasket 8 is also provided with a corresponding through hole. A guide groove 10-1 is provided on the side of the conversion head 10 facing the grinding head 9, which is radially outward from the center position, and is used to conduct the grinding head center hole 9-2 with the grinding head digestion tube connection hole 9-1 or the grinding head optical inspection connection hole 9-3.

[0036] The back of the conversion head 10 is provided with three grooves along the circumference, and three pins are inserted into the three grooves to fix the conversion head 10 and the coupling 13 circumferentially. The other end of the coupling 13 is connected to the rotor of the reduction motor 18, and the induction plate 11, the code disc 14, the disc spring 15 and the bearing 17 are arranged between the coupling 13 and the rotor of the reduction motor 18. The coupling 13, the conversion head 10, the grinding head 9 and the sealing gasket 8 are pressed against the valve head 7 in turn by the pressing force provided by the disc spring 15, so as to complete the sealing of the valve head 7 and the grinding head 9.

[0037] The seal between the grinding head 9 and the conversion head 10 of the valve core is achieved by machining the flatness and roughness of the two working surfaces. Ceramic materials are preferably used to process the two valve cores, which have excellent chemical tolerance and wear resistance, long service life and stable operation.

[0038] The code disc 14 is fixed on the coupling 13, the induction plate 11 is fixed on the valve body 16, and the induction plate cover 12 is also provided on the outside of the induction plate 11. The sensor on the induction plate 11 reads the relative position of the code disc to read and control the stop position of the conversion head 10, thereby accurately controlling the state switching of the valve. The reduction motor 18 provides a rotational torque as a power source to drive the coupling 13 to rotate, and then the coupling 13 drives the conversion head 10 to rotate to achieve the state switching of the valve. Figure 3 As shown in the CC view, when the guide groove 10-1 of the conversion head 10 is in a vertical upward state, the middle interface of the valve is connected to the upper interface; when the guide groove 10-1 is in a vertical downward state, the middle interface of the valve is connected to the left interface; when the guide groove 10-1 is in a horizontal state, the three interfaces of the valve are simultaneously in a closed state.

[0039] In order to detect liquids, such as Figure 2 As shown in the AA view, the valve head 7 is also provided with a light detection connector 22, a quartz glass tube 20, and a light detection circuit board 21 for matching the left flow channel. The quartz glass tube 20 is located inside the left flow channel, and O-rings 19 are provided at both ends of the quartz glass tube 20. The light detection connector 22 is fixedly connected to the valve head 7, and an external threaded interface is provided thereon for connecting and conducting an external power device. The light detection circuit board 21 is fixed on the valve head 7, and is used to determine whether liquid has entered the quartz glass tube 20. A lamp bead 21-1 and a photocell 21-2 are provided thereon. When the quartz glass tube 20 is in two different states of liquid or no liquid, the light emitted by the lamp bead 21-1 is refracted by the liquid or air in the quartz glass tube 20, and the photocell 21-2 on the light detection circuit board 21 will receive different light quantities in the two different states of liquid and no liquid, and output high and low potential signals with large differences to determine whether there is liquid in the quartz glass tube 20.

[0040] The reduction motor of the present embodiment may also be replaced by other torsional power components, and the disc spring of the present embodiment may also be replaced by other elastic pressing members.

[0041] The conversion head 10 and the grinding head 9 of the present embodiment are both made of ceramic material, and have the characteristics of high pressure resistance, high temperature resistance, wear resistance and chemical corrosion resistance.

[0042] The valve head 7 of the present embodiment is made of engineering plastic material, which has excellent processability, is resistant to chemical corrosion, and can withstand high temperatures of more than 200 degrees Celsius.

[0043] The sealing gasket 8 and the O-ring 19 of the present embodiment are made of corrosion-resistant rubber material, which provides good sealing performance and excellent chemical corrosion resistance.

[0044] The quartz glass tube 20 of the present embodiment is made of quartz material, and the inner wall thereof is not easy to be adhered to impurities, and is easy to clean and maintain.

[0045] The conversion head 10 of this embodiment is used as a valve core channel switching component. The code disk 14 cooperates with the photoelectric sensor on the sensor plate 11 to accurately control the stop position of the conversion head 10, thereby ensuring the control accuracy of the conduction state of the multi-channel high-pressure valve.

[0046] The working principle of the optical detection part of the multi-channel high-pressure valve capable of detecting liquid in this embodiment is as follows: Figure 2 As shown in the AA view and the BB view, the middle interface of the valve is connected to the external reagent or water sample. When the valve is used to take liquid, the conversion head 10 is first rotated to connect the left interface, and the optical detection connector 22 is connected to the external power device to start extracting the liquid; at this time, the light bead 21-1 of the optical detection circuit board is lit, and when there is no liquid in the pipeline before the liquid reaches the quartz glass tube 20, the light of the lamp bead moves straight forward, and the optical detection circuit board photocell 21-2 cannot receive a signal; the power device continues to work, and the liquid moves forward in the pipeline. When the liquid reaches the quartz glass tube 20, the light emitted by the light bead 21-1 of the optical detection circuit board enters the photocell 21-2 of the optical detection circuit board due to the refraction of the liquid. The photocell receives the signal, and the device determines that there is liquid in the pipeline. The length of the pipe connected to the middle interface of this valve is a fixed value. As a metering pipe, when the equipment determines that the metering pipe is full of liquid, the conversion head guide groove 10-1 is switched to the blind position, and then the external multi-channel valve connected to the other end of the metering pipe is switched. In this process, since the middle interface is in a closed state, the metering pipe to the grinding head 9 position is full of liquid, and the liquid is incompressible, so when the external multi-channel valve is switched, although pressure fluctuations will occur at the other end of the metering pipe, the liquid in the metering pipe will not fluctuate, ensuring a very high metering accuracy. After the other end of the metering pipe is stably switched to the air of the external multi-channel valve, the high-pressure valve turns the conversion head guide groove 10-1 to connect the middle interface and the upper interface, and completely extracts the liquid in the metering pipe into the digestion tube connected to the upper interface.

[0047] After completing the liquid collection of a metering tube, the conversion head guide groove 10-1 is rotated again to connect the middle interface and the left interface, and the external power device connected by the optical detection connecting piece 22 starts to work, evacuating the liquid in the quartz glass tube 20 to prepare for the next liquid collection.

[0048] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A multi-channel high-pressure valve capable of detecting liquids, characterized in that: The multi-channel high pressure valve comprises: Torsion power components (18); A valve body (16) fixedly connected to the torsional power component (18); A valve head (7) is fixedly connected to the valve body (16), and a first flow channel, a second flow channel and a third flow channel are formed on the valve head; The valve core is located in the valve body (16), and comprises a conversion head (10) and a grinding head (9). The grinding head (9) is tightly attached to the valve head (7). The grinding head (9) is provided with a central through hole and two connecting through holes which are respectively connected to the first flow channel, the second flow channel and the third flow channel one by one. The conversion head (10) is provided with a guide groove (10-1) extending radially outward from the center position on a surface facing the grinding head (9) for conducting the central through hole and the connecting through holes. The conversion head (10) is connected to the valve body (16) by a coupling (1 3) circumferentially fixed to the rotor of the torsional power component (18); an induction plate (11), a code disc (14), an elastic pressing member (15) and a bearing (17) are arranged between the coupling (13) and the rotor of the torsional power component (18); the coupling (13), the conversion head (10) and the grinding head (9) are pressed onto the valve head (7) in sequence through the elastic pressing member (15); the code disc (14) is fixed to the coupling (13), and the induction plate (11) is fixed to the valve body (16); The valve head (7) further comprises an optical detection connecting piece (22), a quartz glass tube (20), and an optical detection circuit board (21) which cooperate with the third flow channel and are used to realize liquid detection; the quartz glass tube (20) is located in the third flow channel, the optical detection connecting piece (22) is used to connect and conduct an external power device, and the optical detection circuit board (21) is fixed on the valve head (7) and is used to determine whether liquid has entered the quartz glass tube (20); the second flow channel of the valve head (7) is a metering flow channel with a fixed pipeline length; The optical inspection circuit board (21) is provided with a lamp bead (21-1) and a photocell (21-2). When the quartz glass tube (20) is in two different states, namely, the presence or absence of liquid, the light emitted by the lamp bead (21-1) is refracted by the liquid or air in the quartz glass tube (20). The photocell (21-2) on the optical inspection circuit board (21) receives different amounts of light in the two different states of the presence or absence of liquid, and outputs high and low potential signals with large differences, thereby judging whether there is liquid in the quartz glass tube (20); The torsional power component is a reduction motor.

2. The multi-channel high-pressure valve capable of detecting liquid according to claim 1, characterized in that: The valve core further comprises a sealing gasket (8) arranged between the valve head (7) and the grinding head (9), and the sealing gasket (8) is provided with through holes corresponding one to one to the central through hole of the grinding head (9) and the plurality of connecting through holes.

3. The multi-channel high-pressure valve capable of detecting liquid according to claim 2, characterized in that: O-rings (19) are provided at both ends of the quartz glass tube (20), and an external threaded interface is provided on the optical inspection connector (22).

4. The multi-channel high-pressure valve capable of detecting liquid according to claim 1, characterized in that: The elastic pressing member (15) is a disc spring.

5. The multi-channel high-pressure valve capable of detecting liquid according to claim 1, characterized in that: The conversion head (10) and the grinding head (9) are both made of ceramic material.

6. The multi-channel high-pressure valve capable of detecting liquid according to claim 1, characterized in that: The valve head (7) is made of engineering plastic.

7. The multi-channel high-pressure valve capable of detecting liquid according to claim 3, characterized in that: The sealing gasket (8) and the O-ring (19) are made of corrosion-resistant rubber material.

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