A multi-channel rotary cutting valve capable of disconnecting and switching channels

Abstract

The present invention discloses a multi-channel rotary cut valve capable of switching channels. The coupling is fixedly connected to the output end of a power assembly and rotates under its action. The coupling, conversion head 1, conversion head 2, and valve head are coaxially arranged in sequence. A pin on the coupling fixes the coupling and conversion head 1 in position. A guide groove is provided on the plane where conversion head 1 and conversion head 2 meet. The axis of conversion head 2 is the center hole, and the center distance of the edge holes is equal to the length of the guide groove. A waist-shaped groove is provided on the plane where conversion head 2 and conversion head 1 meet, and the pin moves circumferentially in the waist-shaped groove. The axis of the valve head is the center interface, and multiple circumferential interfaces are uniformly provided along the circumference. The valve head, power assembly, and detection and control assembly are fixedly connected to the valve body. A damping ring is installed between conversion head 2 and the valve body. The detection and control assembly is used to detect the position of the guide groove of conversion head 1 and control the operation of the power assembly. The present invention avoids crosstalk between different port positions on the flow path, which is beneficial to improving the measurement accuracy of the instrument.

Description

Technical Field

[0001] The present invention relates to the field of water quality monitoring, and in particular to a multi-channel rotary cut valve capable of disconnecting and switching channels. Background Art

[0002] A multi-channel valve is a key component in the digestion unit of a chemical-based water quality analyzer. The multi-channel valve controls the flow of water sample inlet, mixing, digestion drain, and cleaning, all of which flow through different reagent bottles, water samples, or wastewater and liquid tanks. Currently, most domestic manufacturers of continuous, automatic online water quality monitoring analyzers use multi-channel valves primarily consisting of diaphragm valves and multi-channel rotary cut-off valves.

[0003] like Figure 1 As shown, diaphragm valves are typically combined on a single valve island, with each valve independently controlled. Multi-channel rotary cut valves, on the other hand, use a rotary cut valve core to switch between the central valve port and the other valve ports. When switching to a non-adjacent valve port, the flow path will briefly connect to the adjacent valve port.

[0004] The disadvantages of the existing solution are:

[0005] (1) Diaphragm exhaust valve solution: multiple diaphragm valve core control modules need to be installed on the valve island, resulting in a large volume, low integration, and numerous wiring harnesses. At the same time, the diaphragm valve itself has the disadvantages of a dead valve core and a large volume.

[0006] (2) Figure 2 As shown, a common multi-channel rotary cutting valve includes a grinding head 17 and a conversion head 18. A grinding head center hole 17-1 is provided at the center of the grinding head 17, and a plurality of grinding head circumferential holes 17-2 are evenly provided around the outer ring, and each grinding head circumferential hole 17-2 is connected to a different valve port; the conversion head 18 has a conversion head guide groove 18-1 radially extending from the center on the mating surface with the grinding head 17; when the conversion head 18 is rotated to a specific angle, the grinding head center hole 17-1 can be connected to different grinding head circumferential holes 17-2 respectively. This multi-channel rotary valve structure means that when it is necessary to switch to two non-adjacent valve ports, the flow path will be briefly connected to the valve port during the process. The water quality continuous automatic online monitoring analyzer usually has multiple different reagents. Due to the differences in density and viscosity of each reagent, there will be a pipeline pressure difference in different channels of the multi-channel valve. When the passage switches the multi-channel rotary valve port position, this pressure difference will cause the liquid-containing pipeline connected to the grinding head center hole 17-1 and the liquid in the pipeline connected to the grinding head circumferential hole 17-2 and various reagents to have different degrees of flow crosstalk, affecting the measurement accuracy of the interference instrument. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention proposes a multi-channel rotary cutting valve capable of disconnecting and switching channels.

[0008] The specific technical solutions are as follows:

[0009] A multi-channel rotary cutting valve capable of disconnecting and switching channels, comprising: a valve head, a second conversion head, a damping ring, a first conversion head, a coupling, a valve body, a power assembly, and a detection and control assembly;

[0010] The coupling is fixedly connected to the output end of the power component and rotates under its action, and the coupling, conversion head 1, conversion head 2, and valve head are coaxially arranged in sequence, and the valve head, conversion head 2, conversion head 1 form a valve core structure, the valve core structure is sealed, and the liquid only flows in the valve core structure; a plurality of pins are fixedly connected to the coupling, which cooperate with the pin holes on the conversion head 1 to fix the relative position of the coupling and the conversion head 1; a radial guide groove is provided on the plane where the conversion head 1 and the conversion head 2 are in contact, and one end of the guide groove is located at the axis of the conversion head 1; a through hole is provided at the axis position of the conversion head 2 as a center hole, and a through hole is provided on the outer periphery as an edge hole, and the center distance of the edge hole is equal to the length of the guide groove; a waist-shaped groove is provided on the plane where the conversion head 2 and the conversion head 1 are in contact, and the pin of the coupling makes limited circumferential motion in the waist-shaped groove, and the arc length of the waist-shaped groove is set, thereby controlling the relative misalignment angle of the conversion head 1 and the conversion head 2;

[0011] A through hole is provided at the axial position of the valve head as a central interface, and multiple through holes are evenly provided along the circumference as circumferential interfaces, and the central interface and the circumferential interfaces are respectively connected to the corresponding liquids; the circumferential interfaces on the plane where the valve head and the conversion head 2 are in contact are evenly arranged around the circumference of the central connection hole, and the center distances are equal to the center distances of the edge holes of the conversion head 2; the edge holes of the conversion head 2 are sequentially connected with the circumferential interfaces of the valve head during the rotation process; the valve head, the power assembly, and the detection and control assembly are fixedly connected to the valve body, and a damping ring is interference-fitted between the conversion head 2 and the valve body; the detection and control assembly is used to detect the position of the guide groove of the conversion head 1 and control the power and direction of the power assembly.

[0012] Furthermore, the power assembly includes: a compression spring, a thrust bearing, a sliding bearing, a motor connector, and a reduction motor; the motor connector is fixedly connected to the valve body, and the reduction motor is fixedly connected to the inside of the motor connector; the output end of the reduction motor is fixedly connected to the coupling, one end of the compression spring is in contact with the coupling, and the other end is in contact with the thrust bearing, providing a sealing thrust for the valve core structure; the thrust bearing is arranged on the outer periphery of the coupling, one end of which is in contact with the compression spring, and the other end is fitted with the plane of the motor connector to ensure that the coupling can still maintain smooth rotation under the thrust of the compression spring; the sliding bearing is arranged on the outer periphery of the coupling, and is fixed to the valve body by interference fit, and is used to radially limit the coupling.

[0013] Furthermore, the detection and control component includes: a code disk, a sensor plate, a sensor plate cover, a control plate bracket, and a control plate; the code disk is arranged on the periphery of the coupling, and its position is fixed relative to the coupling; the sensor plate is fixedly connected to the valve body, and the sensor plate reads the position information obtained by the code disk through the sensor; a sensor plate cover is arranged on the outside of the sensor plate, and the sensor plate cover is fixedly connected to the valve body; the control plate bracket is fixedly connected to the power component, and the control board is fixedly connected to the control plate bracket.

[0014] Furthermore, the arc length of the waist-shaped groove is set so that the relative misalignment angle between the first conversion head and the second conversion head is equal to the angle between the two adjacent axial interfaces on the valve core working surface of the valve head.

[0015] Furthermore, when the number of the circumferential interfaces is large, they are divided into inner and outer rings with staggered arrangement, and the interfaces of the inner and outer rings are connected to the valve core working surface of the valve head through through holes with different inclinations. The valve core working surface of the valve head is a plane that fits with the conversion head 2; each circumferential interface is numbered in sequence.

[0016] Furthermore, the damping ring is made of rubber material.

[0017] Furthermore, the valve head, the first conversion head and the second conversion head are all made of ceramic material.

[0018] Furthermore, the valve body is provided with through holes at corresponding positions of the contact surfaces of the conversion head 1 and the conversion head 2, for draining out the exudate accumulated on the contact surfaces of the conversion head 1 and the conversion head 2 during long-term operation.

[0019] The beneficial effects of the present invention are:

[0020] (1) The present invention adds a circuit breaker switching function on the basis of the ordinary multi-channel rotary cutting valve, thereby avoiding crosstalk between different port positions on the flow path, which is beneficial to improving the measurement accuracy of the instrument.

[0021] (2) The valve core structure of the present invention has no dead volume, and the pipeline can be emptied when taking or discharging liquid, without causing contamination of the reagents during secondary liquid collection.

[0022] (3) The present invention has a reasonable structure, compact size, simple control and high integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the valve port switching structure of the diaphragm exhaust valve in the prior art.

[0024] Figure 2 This is a schematic diagram of the valve port switching structure of a common rotary cut valve in the prior art, wherein (a) is the main view and (b) is the left view.

[0025] Figure 3This is a schematic diagram of the structure of a multi-channel rotary cut valve with a switchable channel, wherein (a) is a left view and (b) is a Figure 3 Cross-sectional view of section AA in (a).

[0026] Figure 4 It is an exploded schematic diagram of the valve core and coupling structure of a multi-channel rotary cut valve capable of disconnecting and switching channels at a certain angle according to the present invention.

[0027] Figure 5 It is an exploded schematic diagram of the valve core and coupling structure of a multi-channel rotary cut valve with disconnectable switching channels of the present invention at another angle.

[0028] Figure 6 It is a cross-sectional view of the connection structure of a conversion head 1, a conversion head 2 and a coupling of a multi-channel rotary cut valve capable of disconnecting and switching channels according to the present invention.

[0029] Figure 3-Figure 6 Among them, valve head 1, conversion head 2, waist-shaped groove 2-1, edge hole 2-2, center hole 2-3, damping ring 3, conversion head 1, guide groove 4-1, pin hole 4-2, valve body 5, sliding bearing 6, coupling 7, pin 7-1, compression spring 8, code disk 9, thrust bearing 10, induction plate 11, induction plate cover 12, motor connector 13, reduction motor 14, control board bracket 15, control board 16.

[0030] Figure 1 、 Figure 2 In the figure, there are the grinding head 17, the grinding head center hole 17-1, the grinding head circumferential hole 17-2, the conversion head 18, and the conversion head guide groove 18-1. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become more apparent. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0032] like Figure 3 As shown, a multi-channel rotary cutting valve with disconnectable switching channels includes: a valve head 1, a conversion head 2, a damping ring 3, a conversion head 4, a valve body 5, a sliding bearing 6, a coupling 7, a compression spring 8, a code disk 9, a thrust bearing 10, an induction plate 11, an induction plate cover 12, a motor connector 13, a reduction motor 14, a control board bracket 15, and a control board 16.

[0033] The valve body 5 is cylindrical, the motor connector 13 is annular, and one end of the motor connector 13 is fixedly connected to the right end of the valve body 5; the reduction motor 14 is fixedly connected to the inside of the motor connector 13, the control board bracket 15 is fixedly connected to the other end of the motor connector 13, and the control board 16 is fixedly connected to the control board bracket 15. The control board 16 is used to control the speed and direction of the reduction motor 14.

[0034] The output end of the reduction motor 14 is fixedly connected to the coupling 7, as shown in FIG. Figures 4 to 6 As shown, the coupling 7, converter head 1 4, converter head 2 2, and valve head 1 are arranged coaxially in sequence along the axial direction. The valve head 1, converter head 2 2, and converter head 1 4 form a valve core structure, and liquid flows only within the valve core structure. Multiple pins 7-1 are fixed to the coupling 7, and multiple pin holes 4-2 are provided at corresponding positions on converter head 1 4. The coupling 7 and converter head 1 4 are fixed relative to each other through the pins 7-1 and pin holes 4-2. The working surface of the valve core of converter head 1 4 (i.e., the surface in contact with the liquid) is a plane that aligns with converter head 2 2. A radial guide groove 4-1 is provided on the working surface of the valve core of converter head 1 4, with one end of the guide groove 4-1 located at the axis of converter head 1 4.

[0035] The valve core working surface of conversion head 2 (2) is composed of two planes: the mating surface with conversion head 1 (4) and the mating surface with valve head 1 (1). The two valve core working surfaces are connected by two through-holes: the center hole 2-3 is located at the axis of conversion head 2 (2), and the edge hole 2-2 is located at the periphery. The center distance of edge hole 2-2 is equal to the length of guide groove 4-1, and the relative positions of the two through-holes correspond to the two ends of guide groove 4-1 of conversion head 1 (4). On the valve core working surface of conversion head 2 (2) facing coupling 7, a waist-shaped groove 2-1 is provided at a position corresponding to pin 7-1. Pin 7-1 of coupling 7 can make limited circumferential movement within the waist-shaped groove 2-1. Because the relative position of coupling 7 and conversion head 1 (4) is fixed, the guide groove 4-1 of conversion head 1 (4) and the edge hole 2-2 of conversion head 2 (2) achieve relative offset movement as coupling 7 rotates. The relative offset angle between conversion head 1 (4) and conversion head 2 (2) is controlled by setting the arc length of waist-shaped groove 2-1.

[0036] The valve core working surface of valve head 1 is a flat surface that mates with converter head 2. The other surface, which is convex and faces outward and does not come into direct contact with the liquid, serves as the display surface. A through-hole is provided at the center of the display surface, connecting to the valve core working surface. This through-hole is referred to as the central interface and is connected to the corresponding liquid via a pipeline. The central interface of valve head 1 is coaxial with the center hole 2-3 of converter head 2 and the guide groove 4-1 of converter head 1 4, located at one end of the axis of converter head 1 4. Multiple through-holes are evenly distributed along the circumference of the display surface, connecting to the valve core working surface. These through-holes are referred to as circumferential interfaces and are connected to the corresponding liquid via pipelines. Each circumferential interface is numbered sequentially. When there are a large number of circumferential interfaces, they can be arranged in an inner and outer ring with staggered positions. The interfaces on the inner and outer rings connect to the valve core working surface via through-holes of different inclinations. The central interface on the valve core working surface of valve head 1 is also centrally located, with circumferential interfaces evenly spaced around the central connection hole, and with equal center-to-center spacing. The edge holes 2-2 of adapter head 2 sequentially connect with the circumferential interfaces of valve head 1 during rotation. In this embodiment, the arc length of waist-shaped groove 2-1 is set so that the relative misalignment angle between adapter head 1 4 and adapter head 2 2 is equal to the angle between the adjacent two circumferential interfaces on the valve core working surface of valve head 1.

[0037] The valve head 1 is fixedly connected to the left end of the valve body 5, and a damping ring 3 is arranged between the conversion head 2 and the valve body 5. The damping ring 3 is made of corrosion-resistant rubber material, has excellent chemical corrosion resistance and wear-resistant and aging-resistant mechanical properties, and provides stable rotational damping for the conversion head 2.

[0038] Valve body 5 has a through-hole at the corresponding position on the mating surface of conversion head 1 4 and conversion head 2 2. This through-hole allows exudate accumulated on the mating surface of conversion head 1 4 and conversion head 2 during long-term operation to be discharged outside valve body 5. Valve head 5, conversion head 1 4, and conversion head 2 2 are all made of ceramic, which has properties such as high pressure resistance, high temperature resistance, wear resistance, and chemical corrosion resistance, and has a long lifespan and a wide range of applications.

[0039] Code disk 9 is mounted on the periphery of coupling 7 and fixed relative to coupling 7. A sensor plate 11 is fixedly attached to valve body 5. Sensor plate 11 uses a sensor to read position information obtained from code disk 9, thereby precisely controlling the stop position of guide groove 4-1 of converter head 1 4 and ensuring accurate control of the channel conduction state of the multi-channel rotary cutting valve of the present invention. A sensor plate cover 12 is mounted on the exterior of sensor plate 11 and fixedly attached to valve body 5 to protect and cover sensor plate 11.

[0040] One end of the compression spring 8 presses against the coupling 7, and the other end presses against the thrust bearing 10, providing sealing thrust for the valve core structure. The thrust bearing 10 is arranged on the outer periphery of the coupling 7, with one end pressing against the compression spring 8 and the other end being fitted with the motor connector 13 in a plane, to ensure that the coupling 7 can still maintain smooth rotation under the thrust of the compression spring 8. The sliding bearing 6 is arranged on the outer periphery of the coupling 7 and is fixed with the valve body 5 by interference fit, to limit the torsional swing amplitude of the coupling 7 (i.e., radial limiting), to ensure the coaxiality of the coupling 7 and the valve body 5, and to ensure the control accuracy of the relative position of the induction plate 11 and the code disk 9.

[0041] When switching channels, the reduction motor 14, as a power component, outputs torque, driving the coupling 7 to rotate. The coupling 7 drives the conversion head 1 4 and the conversion head 2 2 to rotate in coordination, thereby switching the central interface of the conduction valve head 1 to different circumferential interfaces. The specific process of switching channels is as follows:

[0042] (1) The conversion head 1 4 and the conversion head 2 2 are fixed and twisted in one direction so that the edge hole 2-2 of the conversion head 2 2 is aligned with the target circumferential interface. Due to the cooperation between the waist-shaped groove 2-1 of the conversion head 2 2 and the pin 7-1 of the coupling 7, the coupling 7 and the conversion head 1 4 are synchronously rotated by a certain angle (in this embodiment, the angle should be less than or equal to the angle between two adjacent openings) so that the pin 7-1 contacts the side wall of the waist-shaped groove 2-1. Then, the coupling 7, the conversion head 1 4, and the conversion head 2 2 can continue to rotate synchronously in the same direction as before until the edge hole 2-2 of the conversion head 2 2 is aligned with the target circumferential interface; in this embodiment, at this time, the conversion head 1 4 is aligned with the next opening of the target circumferential interface. During the channel switching process, due to the misalignment between conversion head 2 and conversion head 1 4, the edge hole 2-2 of conversion head 2 and the guide groove 4-1 of conversion head 1 4 are not connected, that is, the central interface of the valve head 1 and any circumferential interface are both in a non-conductive open-circuit state. When switching with non-adjacent circumferential interfaces, the central interface is isolated from other circumferential interfaces along the way to avoid additional disturbances in the flow path.

[0043] (2) Driven by coupling 7, converter head 1 (4) is twisted in the opposite direction. At this time, pin 7-1 of coupling 7 does not contact converter head 2 (2), and the torsional force of coupling 7 does not directly act on converter head 2 (2). Simultaneously, damping ring 3 provides additional frictional resistance to converter head 2 (2), so that when converter head 1 (4) and converter head 2 (2) move relative to each other, converter head 2 (2) remains stationary under the action of damping ring 3. Ultimately, guide groove 4-1 of converter head 1 (4) coincides with edge hole 2-2 of converter head 2 (2), and the central interface of valve head 1 is now in communication with the target circumferential interface. In this embodiment, converter head 1 (4) retreats one position in the opposite direction.

[0044] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art will still be able to modify the technical solutions described in the foregoing examples or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the invention shall be included within the scope of protection of the invention.

Claims

1. A multi-channel rotary cutting valve with a switchable channel, characterized in that: include: Valve head, conversion head 2, damping ring, conversion head 1, coupling, valve body, power assembly, detection and control assembly; The coupling is fixedly connected to the output end of the power component and rotates under its action, and the coupling, conversion head 1, conversion head 2, and valve head are coaxially arranged in sequence, and the valve head, conversion head 2, conversion head 1 form a valve core structure, the valve core structure is sealed, and the liquid only flows in the valve core structure; a plurality of pins are fixedly connected to the coupling, which cooperate with the pin holes on the conversion head 1 to fix the relative position of the coupling and the conversion head 1; a radial guide groove is provided on the plane where the conversion head 1 and the conversion head 2 are in contact, and one end of the guide groove is located at the axis of the conversion head 1; a through hole is provided at the axis position of the conversion head 2 as a center hole, and a through hole is provided on the outer periphery as an edge hole, and the center distance of the edge hole is equal to the length of the guide groove; a waist-shaped groove is provided on the plane where the conversion head 2 and the conversion head 1 are in contact, and the pin of the coupling makes limited circumferential motion in the waist-shaped groove, and the arc length of the waist-shaped groove is set, thereby controlling the relative misalignment angle of the conversion head 1 and the conversion head 2; A through hole is provided at the axial position of the valve head as a central interface, and multiple through holes are evenly provided along the circumference as circumferential interfaces, and the central interface and the circumferential interfaces are respectively connected to the corresponding liquids; the circumferential interfaces on the plane where the valve head and the conversion head 2 are in contact are evenly arranged around the circumference of the central interface, and the center distances are equal to the center distances of the edge holes of the conversion head 2; the edge holes of the conversion head 2 are sequentially connected with the circumferential interfaces of the valve head during the rotation process; the valve head, the power assembly, and the detection and control assembly are fixedly connected to the valve body, and a damping ring is interference-fitted between the conversion head 2 and the valve body; the detection and control assembly is used to detect the position of the guide groove of the conversion head 1 and control the power and direction of the power assembly.

2. The multi-channel rotary cutting valve with disconnectable switching channels according to claim 1, characterized in that: The power assembly includes: a compression spring, a thrust bearing, a sliding bearing, a motor connector, and a reduction motor; the motor connector is fixedly connected to the valve body, and the reduction motor is fixedly connected to the inside of the motor connector; the output end of the reduction motor is fixedly connected to the coupling, one end of the compression spring is in contact with the coupling, and the other end is in contact with the thrust bearing, providing a sealing thrust for the valve core structure; the thrust bearing is arranged on the outer periphery of the coupling, one end of which is in contact with the compression spring, and the other end is fitted with the plane of the motor connector to ensure that the coupling can still maintain smooth rotation under the thrust of the compression spring; the sliding bearing is arranged on the outer periphery of the coupling, and is fixed to the valve body by interference fit, and is used to radially limit the coupling.

3. The multi-channel rotary cutting valve with disconnectable switching channels according to claim 1, characterized in that: The detection and control component includes: a code disk, a sensor plate, a sensor plate cover, a control plate bracket, and a control plate; the code disk is arranged on the periphery of the coupling, and its position is fixed relative to the coupling; the sensor plate is fixedly connected to the valve body, and the sensor plate reads the position information obtained by the code disk through a sensor; a sensor plate cover is arranged on the outside of the sensor plate, and the sensor plate cover is fixedly connected to the valve body; the control plate bracket is fixedly connected to the power component, and the control board is fixedly connected to the control plate bracket.

4. The multi-channel rotary cutting valve with disconnectable switching channels according to claim 1, characterized in that: The arc length of the waist-shaped groove is set so that the relative misalignment angle between the first conversion head and the second conversion head is equal to the angle between the two adjacent axial interfaces on the valve core working surface of the valve head.

5. The multi-channel rotary cutting valve with disconnectable switching channels according to claim 1, characterized in that: When the number of the circumferential interfaces is large, they are divided into inner and outer rings with staggered arrangement, and the interfaces of the inner and outer rings are connected to the valve core working surface of the valve head through through holes with different inclinations. The valve core working surface of the valve head is a plane that fits with the conversion head 2; each circumferential interface is numbered in sequence.

6. The multi-channel rotary cutting valve with disconnectable switching channels according to claim 1, characterized in that: The damping ring is made of rubber material.

7. The multi-channel rotary cutting valve with disconnectable switching channels according to claim 1, characterized in that: The valve head, the first conversion head and the second conversion head are all made of ceramic material.

8. The multi-channel rotary cutting valve with disconnectable switching channels according to claim 1, characterized in that: The valve body is provided with through holes at corresponding positions of the contact surfaces of the conversion head 1 and the conversion head 2, for draining out the exudate accumulated on the contact surfaces of the conversion head 1 and the conversion head 2 during long-term operation.

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