CN220151956U - Multi-channel switching valve - Google Patents

Abstract

The utility model relates to a multichannel material conveying technical field, especially relate to a multichannel switching valve includes valve body and opening and closing mechanism, and wherein, the valve body has valve pocket and two pairs of valve ports that communicate with the valve pocket, the valve body is the integral box, and every valve port of pair all disposes an opening and closing mechanism. The opening and closing mechanism comprises a valve rod, a valve core and a driving assembly, wherein the valve rod is arranged on the valve body, the valve core is arranged on the valve rod, and the driving assembly is configured to drive the valve rod to drive the valve core to move between a pair of corresponding valve ports relative to the valve body so as to enable the valve core to open or close one valve port. The multi-channel switching valve can be used in the application scenes such as alumina production, and can realize the flow direction switching requirement of a planar pipeline in a limited space, simplify a complex pipeline, save the arrangement of space pipelines, reduce the number of installed valves, reduce leakage points and save cost.

Description

Multi-channel switching valve

Technical Field

The disclosure relates to the field of multi-channel material conveying, and in particular relates to a multi-channel switching valve.

Background

In the production process of alumina, switching of the pipeline flow is required. As shown in the figure, four pipelines exist, the pipelines are required to be communicated, and the switching of the required inlets and outlets is realized.

As shown in fig. 1, the pipeline flanges ABCD are on the same plane, and because of space limitation, valves cannot be installed on each pipeline on site to control fluid circulation, and even if space allows, four valves are required to be installed to realize flexible flow change, so that the cost is high, customized four-way pipelines are adopted on site, and splayed blind plates are installed at the joints of the four flanges, when the flow needs to be switched, the pipeline is stopped first, and then the splayed blind plates are disassembled according to the need to realize the change of the flow.

Obviously, although the currently adopted method for installing the splayed blind plates can realize the flow switching, the operation is complex, and the pipeline is firstly stopped, so that the production progress is influenced; and the caliber of the pipeline is large, the operation space and usable equipment are limited, and the manual operation difficulty is high.

Disclosure of Invention

The utility model provides a multichannel switching valve in order to solve the technical problem that prior art exists.

The multi-channel switching valve of the present disclosure includes:

the valve body is provided with a valve cavity and at least two pairs of valve ports communicated with the valve cavity, the valve body is of an integral box structure, and each pair of valve ports is provided with an opening and closing mechanism; the opening and closing mechanism comprises:

the valve rod is arranged on the valve body;

the valve core is arranged on the valve rod;

the driving assembly is configured to drive the valve rod to drive the valve core to move between a pair of valve ports corresponding to the valve body, so that one valve port is opened or closed by the valve core.

In one embodiment, the multi-channel switching valve further comprises:

the number of the external connection pipes is the same as that of the valve ports, and the external connection pipes are connected with the valve body and communicated with the valve cavity through the corresponding valve ports;

the pipe orifice axis of the external pipe is inclined relative to the movement direction of the valve core, and two adjacent valve ports are inclined away from each other.

In one embodiment, the inclination angle of the nozzle axis of the extension tube with respect to the movement direction of the valve core is greater than or equal to 45 ° and less than or equal to 90 °.

In one embodiment, the valve body has two pairs of the valve ports, the two pairs of the valve ports being symmetrically disposed about a vertical centerline of the valve body.

In one embodiment, four of the extension tubes are in the same plane.

In one embodiment, the multi-channel switching valve comprises a valve seat arranged at the joint of each valve port and the corresponding external connection pipe, and the valve core is in contact fit with the valve seat to close the corresponding valve port.

In one embodiment, one of the valve ports of a pair is located above the other valve port.

In one embodiment, one end of the valve rod penetrates through the external connection pipe communicated with the valve port below and stretches into the valve cavity, and the valve core is arranged on the end of the valve rod positioned in the valve cavity.

In one embodiment, the drive assembly includes:

the base is fixedly connected with the external connection pipe positioned below, and the valve rod is arranged on the base;

the hand wheel is arranged on the base and is configured to drive the valve rod to drive the valve core to move in the rotating process, and the rotating axis of the hand wheel is perpendicular to the moving direction of the valve rod.

In one embodiment, the valve body has two pairs of valve ports, an external connection pipe communicated with one valve port of the pair of valve ports is called a first channel, an external connection pipe communicated with the other valve port is called a second channel, an external connection pipe communicated with one valve port of the other pair of valve ports is called a third channel, and an external connection pipe communicated with the other valve port is called a fourth channel;

the valve rod is configured to drive the corresponding valve core,

closing the first channel and the fourth channel, and opening the second channel and the third channel; or,

closing the first channel, and opening the second channel, the third channel and the fourth channel; or,

closing the second channel, and opening the first channel, the third channel and the fourth channel; or,

closing the third channel, and opening the first channel, the second channel and the fourth channel; or,

closing the fourth channel, and opening the first channel, the second channel and the third channel; or,

closing the first channel and the third channel, and opening the second channel and the fourth channel; or,

closing the second channel and the third channel, and opening the first channel and the fourth channel; or,

closing the second channel and the fourth channel, and opening the first channel and the third channel; or,

and opening the first channel, the second channel, the third channel and the fourth channel.

One of the beneficial effects of the multichannel switching valve of the present disclosure is that the multichannel switching valve of the present disclosure includes a valve body and an opening and closing mechanism, wherein the valve body has a valve cavity and two pairs of valve ports communicated with the valve cavity, and each pair of valve ports is configured with an opening and closing mechanism. The opening and closing mechanism comprises a valve rod, a valve core and a driving assembly, wherein the valve rod is arranged on the valve body, the valve core is arranged on the valve rod, and the driving assembly is configured to drive the valve rod to drive the valve core to move between a pair of corresponding valve ports relative to the valve body so as to enable the valve core to open or close one valve port.

The multi-channel switching valve can be used in the application scenes such as alumina production, and can realize the flow direction switching requirement of a planar pipeline in a limited space, simplify a complex pipeline, save the arrangement of space pipelines, reduce the number of installed valves, reduce leakage points and save cost. And, the valve body of this disclosure is integral box structure, simple structure, the processing of being convenient for.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of a four-way switching valve in the prior art;

FIG. 2 is a schematic cross-sectional structural view of a multi-channel switching valve of the present disclosure in one embodiment;

FIG. 3 is a schematic cross-sectional structural view of a multi-channel switching valve of the present disclosure in another embodiment;

fig. 4 to 12 are schematic views of nine different communication modes of the multi-channel switching valve shown in fig. 2, respectively.

Wherein, the one-to-one correspondence between the respective component names and the reference numerals in fig. 2 to 12 is as follows:

1 valve body: 10 valve cavity, 11 valve port, 12 first straight line, 13 second straight line;

a first extension tube 21, a second extension tube 22, a third extension tube 23, a tube orifice axis 230, and a fourth extension tube 24;

30 valve rod, 300 fourth straight line, 31 valve core, 32 valve seat, 33 support, 34 base, 35 hand wheel, 36 holding clamp, 37 packing box, 38 packing and 39 packing fixing piece;

a a first channel; b a second channel; a third channel; and D, a fourth channel.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In addition, the use of ordinal numbers "first," "second," etc., for components or regions of the same name herein distinguishes among the ordinal numbers, and do not limit the importance or the existing order of the components or regions.

In order to solve the technical problems described in the background art, the present disclosure provides a multi-channel switching valve, and the specific structure and the working principle of the multi-channel switching valve of the present disclosure are described in detail below with reference to fig. 2 to 12 by taking a four-channel switching valve as an example in connection with a specific embodiment.

Referring to fig. 2, in the present embodiment, the multichannel switching valve of the present disclosure includes a valve body 1 and an opening and closing mechanism, wherein the valve body 1 has a valve chamber 10 and two pairs of valve ports 11 communicating with the valve chamber 10, and each pair of valve ports 11 is provided with an opening and closing mechanism.

The opening and closing mechanism includes a valve rod 30, a valve core 31, and a driving assembly, wherein the valve rod 30 is disposed on the valve body 1, the valve core 31 is disposed on the valve rod 30, and the driving assembly is configured to drive the valve rod 30 to drive the valve core 31 to move between a corresponding pair of valve ports 11 relative to the valve body 1, so that the valve core 31 opens or closes one of the valve ports 11.

In detail, the valve body 1 may be an integral box structure with a square and cylindrical shape, that is, the valve body of the disclosure is made of a complete box, and is not formed by splicing and assembling a plurality of different box structures, and has the advantages of simple structure and convenience in processing.

The valve body 1 is internally provided with a valve cavity 10, and the shell of the valve body 1 is provided with four valve ports 11 communicated with the valve cavity 10, namely, fluid such as slurry can flow into the valve cavity 10 through any one valve port 11 or a plurality of valve ports 11, and then flows from the valve cavity 10 through any other valve port or valve ports 11. Of course, the valve body 1 may be a hollow cylindrical tube with two closed ends, and the wall of the tube is provided with the valve port 11, and the shape of the valve body is not limited herein.

The four valve ports 11 are divided into two pairs, and the center lines of the two pairs of valve ports 11 are collinear, as shown in fig. 1, in this embodiment, one valve port 11 of the pair of valve ports 11 is located above the other valve port 11, and the two pairs of valve ports 11 are symmetrically arranged with respect to the vertical center line of the valve body 1, which may also be understood as that the center lines of the two pairs of valve ports 11 are located in the same vertical plane. It should be noted that, in the description of the structure of the multi-channel switching valve, the terms of "vertical" and "horizontal" are all set based on fig. 1, in which in fig. 1, X represents a horizontal direction, Y represents a vertical direction in two-dimensional coordinates, a first straight line 12 represents a horizontal center line of the valve body 1, and a second straight line 13 represents a vertical center line of the valve body 1.

The vertical center lines of the four valve ports 11 of the valve body 1 are positioned in the same plane, so that external pipelines communicated with all the valve ports 11 switched by multiple channels can be paved in the same plane, and the pipeline design is simple and convenient to realize. It can be appreciated that in other embodiments, the centerlines of the four valve ports 11 of the valve body 1 of the disclosure are located in different planes, that is, the centerlines of the four valve ports 11 are located in different plane relation to each other, so long as the installation requirement of the application scenario of the multi-channel switching valve is satisfied, for example, in a horizontal plane, the projections of the four valve ports 11 may be arranged in a circular array.

In addition, the shape of the valve port 11 on the valve body 1 of the present disclosure may be a circle, a polygon or other special-shaped hole structure, which is not specifically limited herein.

With continued reference to fig. 2, in the embodiment, the multichannel switching valve of the present disclosure controls the opening or closing of one valve port 11 of each pair of valve ports 11 according to the actual material conveying requirement by configuring an opening and closing mechanism for each pair of valve ports 11.

In detail, one end of the valve rod 30 of the opening and closing mechanism of the present disclosure is inserted into the valve cavity 10 through the valve port 11 located below, and the end of the valve rod 30 located in the valve cavity 10 is fixedly connected with the valve core 31.

Specifically, the end of the valve rod 30 is fitted with a flange plate fixedly connected to the lower end surface of the valve core 31 by bolts. When the valve core 31 is damaged, a worker can conveniently detach the valve core 31 and replace the valve core 31 with a new one.

The valve rod 30 reciprocates up and down in the valve cavity 10 relative to the valve body 1 under the action of the driving assembly, and aims to drive the valve core 31 to move between the pair of valve ports 11 so as to close one valve port 11 and open the other valve port 11 or be positioned between the two valve ports 11, so that both valve ports 11 are communicated with the valve cavity 10.

It should be noted that, the specific shape of the valve core 31 depends on the shape of the valve port 11, so as to close the valve port 11 after being matched with the valve port 11, and the cross-sectional shape of the valve core may be square, circular or other special-shaped structures.

The valve core 31 may directly contact and cooperate with an end surface or a circumferential annular surface of the valve port 11 to close the valve port 11, and prevent fluid such as slurry, air, etc. from flowing into the valve cavity 10 from the outside of the valve body 1 or flowing from the valve cavity 10 of the valve body 1 to the outside.

In order to improve the sealing effect of closing the valve ports 11 after the valve core 31 and the valve body 1 are in contact fit, in this embodiment, a valve seat 32 is disposed at each valve port 11 of the valve body 1, and the valve core 31 is matched with the valve seat 32 to achieve the purpose of closing the corresponding valve port 11. Specifically, the valve seat 32 and the valve element 31 are fitted by means of an adapted conical surface.

For example, under the action of the driving component, the valve rod 30 drives the valve core 31 to move upwards from the current position to be in contact fit with the conical surface of the valve seat 32 of the valve port 11 positioned above, and then the valve port 11 is closed.

Conversely, when the valve rod 30 drives the valve core 31 to move downwards to contact with the conical surface of the valve seat 32 of the valve port 11 positioned below, the valve port 11 is closed, and when the valve rod 30 drives the valve core 31 to be positioned between the two valve ports 11, the two valve ports 11 are both in an open state.

It can be understood that the valve body 1 of the present disclosure may be directly connected to external pipelines, but due to different practical application scenarios of the multi-channel switching valve, the multi-channel switching valve of the present disclosure further includes external pipes, the number of which depends on the number of the valve ports 11, that is, each valve port 11 is configured with one external pipe, so that each valve port 11 communicates with an external pipeline through the external pipe corresponding to the valve port, so as to adapt to installation requirements in different application scenarios.

For convenience of description, these four extension pipes are distinguished by ordinal words, that is, the multi-channel switching valve includes a first extension pipe 21, a second extension pipe 22, a third extension pipe 23, and a fourth extension pipe 24, which are connected to the valve body 1 and communicate with the valve chamber 10 through respective corresponding valve ports 11.

In detail, a flange is arranged at each valve port 11 of the valve body 1, a matched flange is also arranged on each external connecting pipe, and the flanges of the valve body 1 and the external connecting pipes are locked by locking nuts after being connected by bolts.

Based on this kind of structure, offered the constant head tank on the flange dish of valve body 1 and the flange dish of takeover outward, disk seat 32 is annular disk seat 32 specifically, and the partial structure of annular disk seat 32 is located the constant head tank of two flange dishes, and when valve body 1 and takeover pass through bolted connection, disk seat 32 is compressed tightly in the constant head tank between valve body 1 and the takeover both, simple structure and easy dismounting.

In order to prevent leakage of fluid in the valve chamber 10 of the valve body 1, sealing rings are provided at the mating surfaces between the valve body 1 and the valve seat 32 and between the extension tube and the valve seat 32, i.e. a static sealing connection is formed between the valve body 1 and the valve seat 32 and between the extension tube and the valve body 1.

It can be understood that when the external pipeline is connected with each external pipe, the relative position between two adjacent external pipes can influence the operation space of staff, and if the operation space is too small, the assembly difficulty can be increased, and the assembly efficiency is reduced.

To this end, with continued reference to fig. 2, the nozzle axis 230 of the extension tube of the multichannel switching valve of the present disclosure is inclined relative to the direction of movement of the spool 31, and the nozzles of adjacent two extension tubes are inclined away from each other.

It should be noted that, as used herein in describing the inclination direction of the extension tube, the reference line "nozzle axis 230" refers to a straight line perpendicular to the nozzle of the extension tube and passing through the center thereof, and the nozzle axes of the other extension tubes are the same thereto, which will not be described in detail herein.

So set up, can reserve sufficient operating space between two adjacent outer tubes to make things convenient for staff to communicate outside pipeline and corresponding outer tube, with the reduction assembly degree of difficulty, improve assembly efficiency.

More specifically, in the present embodiment, with continued reference to fig. 2, the nozzle axis 230 of the extension tube has an inclination angle a of 45 ° (degrees) with respect to the direction of movement of the spool 31 (i.e., the direction in which the fourth straight line 300 extends in fig. 2).

That is, the first extension tube 21 and the second extension tube 22 correspond to the valve element 31 of the same opening and closing mechanism, and the valve element 31 moves synchronously with the valve stem 30, based on which the inclination angle a of the nozzle axis 230 of the first extension tube 21 with respect to the first extending direction of the valve stem 30 is 45 °, and the inclination angle B of the nozzle axis 230 of the second extension tube 22 with respect to the second extending direction of the valve stem 30 is 45 °, and the first extending direction and the second extending direction are opposite, i.e., the first extending direction is directed toward the upper end portion of the valve stem 30, and the second extending direction is directed toward the lower end portion of the valve stem 30.

Similarly, the third extension tube 23 and the fourth extension tube 24 correspond to the valve core 31 of the same opening and closing mechanism, and the valve core 31 moves synchronously with the valve rod 30, based on this, the inclination angle of the orifice axis 230 of the third extension tube 23 relative to the first extending direction of the valve rod 30 is 45 °, and the inclination angle of the orifice axis 230 of the fourth extension tube 24 relative to the second extending direction of the valve rod 30 is 45 °, and the first extending direction and the second extending direction are opposite, i.e. the first extending direction is directed to the upper end portion of the valve rod 30, and the second extending direction is directed to the lower end portion of the valve rod 30.

In another embodiment, referring to fig. 3, the nozzle axis 230 of the extension tube has an inclination angle a equal to 90 ° (degrees) with respect to the direction of movement of the spool 31 (i.e., the direction in which the fourth straight line 300 extends in fig. 1).

That is, the first extension tube 21 and the second extension tube 22 correspond to the valve element 31 of the same opening and closing mechanism, and the valve element 31 moves synchronously with the valve stem 30, based on which the inclination angle a of the nozzle axis 230 of the first extension tube 21 with respect to the first extending direction of the valve stem 30 is 90 °, and the inclination angle B of the nozzle axis 230 of the second extension tube 22 with respect to the second extending direction of the valve stem 30 is 90 °, and the first extending direction and the second extending direction are opposite, i.e., the first extending direction is directed toward the upper end portion of the valve stem 30, and the second extending direction is directed toward the lower end portion of the valve stem 30.

Similarly, the third extension tube 23 and the fourth extension tube 24 correspond to the valve core 31 of the same opening and closing mechanism, and the valve core 31 moves synchronously with the valve rod 30, based on this, the inclination angle of the orifice axis 230 of the third extension tube 23 relative to the first extension direction of the valve rod 30 is 90 °, and the inclination angle of the orifice axis 230 of the fourth extension tube 24 relative to the second extension direction of the valve rod 30 is 90 °, and the first extension direction and the second extension direction are opposite, i.e. the first extension direction is directed to the upper end portion of the valve rod 30, and the second extension direction is directed to the lower end portion of the valve rod 30.

Of course, the embodiments of fig. 2 and 3 are merely exemplary embodiments that represent the inclination angle of the nozzle axis 230 of the extension tube with respect to the direction of movement of the valve element 31, and in other embodiments the inclination angle of the nozzle axis 230 of the extension tube with respect to the direction of movement of the corresponding valve element 31 is not limited to the two values described above, as long as the inclination angle of the nozzle axis 230 of the extension tube with respect to the direction of movement of the valve element 31 is greater than or equal to 45 ° and less than or equal to 90 °.

Furthermore, in both embodiments, the nozzle axes 230 of the four extension tubes of the present disclosure lie in the same plane, i.e., the four extension tubes lie in a relatively flat space, thereby making the multi-channel switching valve occupy a relatively small installation space. Of course, the nozzle axes 230 of the four extension tubes may also lie in different vertical planes, such as in a horizontal plane, and the nozzle axes 230 of the four extension tubes may be arranged in a circular array.

With continued reference to fig. 2, in this embodiment, one end of the valve rod 30 extends into the valve cavity 10 of the valve body 1 after penetrating through the outer connecting pipe (i.e., the second outer connecting pipe 22 and the fourth outer connecting pipe 24) and one valve port 11 located below, the end of the valve rod 30 located in the valve cavity 10 is provided with a valve core 31, while the other end of the valve rod 30 is connected with a driving assembly, and the driving assembly is configured to drive the valve rod 30 to move the valve core 31 relative to the valve body 1 so as to open or close one valve port 11 of the pair of valve ports 11 or to open both valve ports 11.

The drive assembly is specifically a manual drive, and in detail, the drive assembly includes a base, a hand wheel 35, and a transmission mechanism.

Wherein, the base is in butt joint with the external connection pipe (namely the second external connection pipe 22) positioned below through the matched flange plate, and then is fixedly connected through bolts. The transmission mechanism is arranged on the base and is in transmission connection with the hand wheel 35 and the valve rod 30, and the transmission mechanism is configured to convert the rotation motion of the hand wheel 35 into the linear motion of the valve rod 30.

In one embodiment, the transmission of the present disclosure may be a rack and pinion transmission in which a pinion of the rack and pinion transmission is rotatably disposed on the base and rotates in synchronization with the rotation axis of the hand wheel 35, and a rack engaged with the pinion is disposed on the valve stem 30 and extends along the axis of the valve stem 30.

When the operator rotates the hand wheel 35, the gear rotates synchronously, and the rack meshed with the gear moves along the axial direction of the valve rod 30, so that the valve core 31 is driven to move between the two valve ports 11.

In one embodiment, the transmission mechanism of the present disclosure may also be a screw-nut transmission mechanism, where the screw of the screw-nut transmission mechanism is directly served by the valve rod 30 or otherwise configured as a screw independent of the valve rod 30, and then the two are fixedly connected by welding or other means. The nut block of the screw-nut transmission mechanism is rotatably provided on the base and rotates in synchronization with the rotation axis of the hand wheel 35.

Furthermore, in the present embodiment, the opening and closing mechanism further includes an anti-rotation device configured such that the anti-rotation valve stem 30 rotates about its own axis with respect to the valve body 1.

Specifically, the anti-rotation device includes a holding clamp 36 for holding the valve rod 30, and a bolt assembly for clamping and connecting two cantilever ends of the holding clamp 36, wherein the holding clamp 36 is fixedly connected to the base through bolts or welded to the base.

When a worker rotates the hand wheel 35, the nut block rotates synchronously, and the screw rod in threaded connection with the nut block moves along the axial direction of the valve rod 30, so that the valve core 31 is driven to move between the two valve ports 11, and the relative position of the valve core 31 relative to the two valve ports 11 is adjusted.

With continued reference to fig. 2, in this embodiment, the axis of rotation of the hand wheel 35 and the direction of movement of the valve stem 30 in an opening and closing mechanism are perpendicular to each other.

Because the axis of the valve rod 30 extends in the vertical direction, if the rotation axis of the hand wheel 35 and the movement direction of the valve rod 30 are perpendicular to each other, a worker does not need to perform an operation process in a squatting or lying manner when operating the hand wheel 35, and can easily rotate the hand wheel 35 in a standing or squatting manner, thereby having the characteristics of simple and convenient operation, etc.

Based on this structure, an adjustment structure is added between the hand wheel 35 and the nut block or the gear, and the adjustment structure is configured to adjust the first rotation axis of the hand wheel 35 to the second rotation axis of the gear or the nut block, where the first rotation axis is perpendicular to the second rotation axis.

Specifically, in one embodiment, the adjusting structure includes a first bevel gear and a second bevel gear meshed with each other, where the first bevel gear rotates synchronously with the rotation axis of the hand wheel 35, and the second bevel gear meshed with the first bevel gear rotates synchronously with the rotation axis of the hand wheel 35 while driving the gear or the nut block, and then the gear pushes the rack to drive the valve rod 30 to move along the axis thereof, or the nut block drives the lead screw (valve rod 30) to move along the axis of the valve rod 30.

Further, since the valve rod 30 extends into the valve cavity 10 after penetrating through the external connection pipe (the second external connection pipe 22 and the fourth external connection pipe 24) located below, in order to prevent leakage of fluid at the position where the valve rod 30 penetrates through the external connection pipe, the external connection pipe and the valve rod 30, the base and the valve rod 30 are connected through a dynamic seal assembly, and in particular, the external connection pipe and the valve rod 30, the base and the valve rod 30 are connected through a packing dynamic seal.

Specifically, the dynamic seal assembly includes a packing box 37, a packing fixing member 39 and a packing 38, wherein the packing box 37 is sleeved on the valve rod 30 and has an annular flange formed by extending outwards, the annular flange extends into a positioning groove formed by opposite matching surfaces between the outer connecting pipe and the base, a radial packing groove with an open lower end is formed between the valve rod 30 and the packing box 37, the packing is injected into the packing groove, the packing fixing member 39 is also sleeved on the valve rod 30 and fixedly connected with the base, and the packing fixing member 39 is configured to seal the open end of the radial packing groove so as to seal the packing 38 in the packing groove.

The filler materials commonly used include asbestos fabrics, carbon fibers, rubber, flexible graphite, engineering plastics, etc., which are prefabricated in a ring shape or a strip shape (some fillers having good lubricity are required to be impregnated in advance), and a multi-ring or spiral multilayer structure is adopted. Stuffing boxes 37 are used to house the stuffing. The packing fixing member 39 includes a gland, a bolt, a spring, etc. for pre-tightening the packing, preventing leakage of the medium during operation, and the spring can perform a compensation function.

The base comprises a base 34 and a bracket 33 which are connected with each other, the base 34 is configured to be provided with a transmission mechanism, an adjusting mechanism and the like, and a hand wheel 35 passes through the base 34 and is connected with the transmission mechanism and/or the adjusting mechanism, so that the purpose of driving the valve rod 30 to drive the valve core 31 to move between the two valve ports 11 by rotating the hand wheel 35 is achieved.

Further, in order to facilitate the operator to rotate the operation hand wheel 35, the hand wheels 35 of the two opening and closing mechanisms are symmetrically arranged with respect to the vertical center line of the valve body 1, that is, the hand wheel 35 is located at the outer side of the two opening and closing mechanisms.

So set up, when two staff operate hand wheel 35 simultaneously, not influenced each other, operating space is big, can improve operating efficiency.

For better understanding, nine conduction modes of the multi-channel switching valve of the present disclosure are described below with reference to fig. 4 to 12. It should be noted that, for convenience of description, in this disclosure, an external connection pipe is referred to as a channel, in this embodiment, a four-way switching valve is taken as an example, the first external connection pipe 21 corresponds to the first channel a, the second external connection pipe 22 corresponds to the second channel B, the third external connection pipe 23 corresponds to the third channel C, and the fourth external connection pipe 24 corresponds to the fourth channel D.

In one embodiment, the first and fourth channels a and D are closed and the second and third channels B and C are open, that is, fluid flows in an external conduit in communication with the second and third channels B and C.

In one embodiment, the fourth channel D is closed and the first, second and third channels a, B, C are open, i.e. the fluid flows in an external conduit communicating with the first, second and third channels a, B, C.

In one embodiment, the second and third channels B and C are closed and the first and fourth channels a and D are open, that is, fluid flows in an external conduit in communication with the first and fourth channels a and D.

In one embodiment, the first channel a is closed, the second channel B, the third channel C, the fourth channel D are open, that is, the fluid flows in an external pipe communicating with the second channel B, the third channel C, the fourth channel D.

In one embodiment, the third channel C is closed and the first, second and fourth channels a, B, D are open, i.e. the fluid flows in an external conduit communicating with the first, second and fourth channels a, B, D.

In one embodiment, the second channel B is closed and the first, third and fourth channels a, C, D are opened, that is, the fluid flows in an external pipe communicating with the first, third and fourth channels a, C, D.

In one embodiment, the first and third channels a and C are closed and the second and fourth channels B and D are open, that is, fluid flows in an external conduit in communication with the second and fourth channels B and D.

In one embodiment, the second and fourth channels B and D are closed and the first and third channels a and C are open, that is, fluid flows in an external conduit in communication with the first and third channels a and C.

In one embodiment, the first, second, third, and fourth channels a, B, C, D are open, that is, fluid flows in an external conduit in communication with the first, second, third, and fourth channels a, B, C, D.

Of course, the opening or closing of each channel is realized by driving the corresponding valve core 31 by the valve rod 30 in the corresponding opening and closing mechanism, which is described in detail in the foregoing, and will not be repeated here.

Obviously, the multi-channel switching valve can realize the flow direction switching requirement of a planar pipeline in a limited space by using the multi-channel switching valve in the application scenes such as alumina production and the like, simplify a complex pipeline, save the arrangement of space pipelines, reduce the number of installed valves, reduce the leakage point and save the cost. That is, the multi-channel switching valve of the present disclosure has the following features:

1. the operation is simple, the disassembly and assembly of the pipeline are not needed, and the labor is saved;

2. the process can be switched without stopping production, so that the economic benefit is good;

3. the executing mechanism can save manpower, and meanwhile, if the electric executing mechanism is adopted, remote operation can be realized, and the intellectualization of the equipment can be realized.

The electric actuating mechanism can replace the manual rotation hand wheel in the previous description by a stepping motor, or directly push the valve rod by using automatic equipment such as an air cylinder or a hydraulic cylinder to drive the valve core to reciprocate along the axis (or the vertical direction) of the valve rod, so that the aim of closing or opening one valve port of a pair of valve ports is fulfilled.

It should be noted that, in the foregoing, the specific structure and the working principle of the multi-channel switching valve of the present disclosure are described by taking the four-channel switching valve as an example, the multi-channel switching valve of the present disclosure is not limited to four channels, and may be an integer multiple of two channels such as six channels, eight channels, and the like.

In one embodiment, the valve body of the multichannel switching valve of the present disclosure has three pairs of valve ports, and each pair of valve bodies is configured with an opening and closing mechanism, each opening and closing mechanism being configured to control one valve port of the pair to open and the other valve port to close.

In this embodiment, the specific structure and the working principle of the opening and closing mechanism are the same as those described above, and are not described herein again.

The embodiments of the present disclosure have been described above, the description is illustrative, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims (10)

1. A multi-channel switching valve, the multi-channel switching valve comprising:

the valve body is provided with a valve cavity and at least two pairs of valve ports communicated with the valve cavity, the valve body is of an integral box structure, and each pair of valve ports is provided with an opening and closing mechanism; the opening and closing mechanism comprises:

the valve rod is arranged on the valve body;

the valve core is arranged on the valve rod;

the driving assembly is configured to drive the valve rod to drive the valve core to move between a pair of valve ports corresponding to the valve body, so that one valve port is opened or closed by the valve core.

2. The multi-channel switching valve according to claim 1, further comprising:

the number of the external connection pipes is the same as that of the valve ports, and the external connection pipes are connected with the valve body and communicated with the valve cavity through the corresponding valve ports;

the pipe orifice axis of the external pipe is inclined relative to the movement direction of the valve core, and two adjacent valve ports are inclined away from each other.

3. The multi-channel switching valve according to claim 2, wherein an inclination angle of a nozzle axis of the extension tube with respect to a movement direction of the spool is 45 ° or more and 90 ° or less.

4. A multi-channel switching valve as claimed in claim 2, wherein the valve body has two pairs of said valve ports, the two pairs of said valve ports being symmetrically disposed about a vertical centerline of the valve body.

5. The multi-channel switching valve of claim 4, wherein four of the extension tubes are in the same plane.

6. The multi-channel switching valve according to claim 2, wherein the multi-channel switching valve includes a valve seat provided at a junction of each valve port and the corresponding external connection pipe, and the valve element is engaged by contact with the valve seat to close the corresponding valve port.

7. The multi-channel switching valve of claim 2, wherein one of the ports of a pair is located above the other port.

8. The multi-channel switching valve according to claim 7, wherein one end of the valve stem extends into the valve cavity through the outer tube communicating with the valve port below, and the valve core is provided on the valve stem end located in the valve cavity.

9. The multi-channel switching valve of claim 8, wherein the drive assembly comprises:

the base is fixedly connected with the external connection pipe positioned below, and the valve rod is arranged on the base;

the hand wheel is arranged on the base and is configured to drive the valve rod to drive the valve core to move in the rotating process, and the rotating axis of the hand wheel is perpendicular to the moving direction of the valve rod.

10. The multi-channel switching valve according to claim 2, wherein the valve body has two pairs of valve ports, an external connection pipe communicating with one of the valve ports of a pair is referred to as a first channel, an external connection pipe communicating with the other valve port is referred to as a second channel, an external connection pipe communicating with one of the valve ports of the other pair is referred to as a third channel, and an external connection pipe communicating with the other valve port is referred to as a fourth channel;

the valve rod is configured to drive the corresponding valve core,

closing the first channel and the fourth channel, and opening the second channel and the third channel; or,

closing the first channel, and opening the second channel, the third channel and the fourth channel; or,

closing the second channel, and opening the first channel, the third channel and the fourth channel; or,

closing the third channel, and opening the first channel, the second channel and the fourth channel; or,

closing the fourth channel, and opening the first channel, the second channel and the third channel; or,

closing the first channel and the third channel, and opening the second channel and the fourth channel; or,

closing the second channel and the third channel, and opening the first channel and the fourth channel; or,

closing the second channel and the fourth channel, and opening the first channel and the third channel; or,

and opening the first channel, the second channel, the third channel and the fourth channel.