CN107588211B

CN107588211B - Waterway switching valve, calibrating method, backwashing control method and filtering control method

Info

Publication number: CN107588211B
Application number: CN201710852707.9A
Authority: CN
Inventors: 许元敏; 徐琳; 赵高纯
Original assignee: Nanjing Tianhe Water Environmental Technology Co ltd
Current assignee: Nanjing Tianhe Water Environmental Technology Co ltd
Priority date: 2017-09-19
Filing date: 2017-09-19
Publication date: 2024-07-30
Anticipated expiration: 2037-09-19
Also published as: CN107588211A

Abstract

The invention provides a waterway switching valve, comprising: the valve comprises a hollow valve body, a valve core rotor, a valve body water inlet, two valve body water outlets, two valve body interfaces, a valve core opening and a water channel switching valve, wherein the valve core rotor is rotatably arranged in the shell around a central line X, the valve body water inlet is communicated with external water, the two valve body water outlets are arranged on the circumferential direction of the valve body, the two valve body interfaces connected with a water channel of a water filter are arranged on one side of the valve body, the valve core is skillfully provided with a wading opening corresponding to the valve body, and the forward and reverse switching of the water flow direction in the water channel switching valve is realized through the position change of the valve core in the valve body. In the waterway switching process, the position of the external water flow interface is not required to be replaced or the external water flow direction is not required to be controlled. Therefore, the waterway switching valve can greatly simplify the work of operators and maintenance personnel, reduce the requirements on the operators and a matched control system, and is suitable for automatic control to a higher degree. The invention also provides an electric waterway switching valve, a position calibration method, a backwashing control method and a filtering control method.

Description

Waterway switching valve, calibrating method, backwashing control method and filtering control method

Technical Field

The invention relates to a multi-position valve for switching waterways, in particular to a multi-position valve for realizing forward and reverse switching of fluid flow directions, a multi-position electric valve, a corresponding calibrating method, a backwashing control method and a filtering control method of the valve.

Background

Water is an indispensable natural resource for human development, and is the material basis for human and all organisms to survive. The water source crisis formed by insufficient water resources and pollution in the world today becomes a major limiting factor for the complex problems and social economic development faced by any one country in terms of policies, economy and technology. To solve the water problems closely related to human society in good reality, modern water treatment technology and water treatment filters are necessarily used.

At present, the most common in daily life is a small household water treatment filter, tap water enters the filter from a water inlet of the household water treatment filter, impurities and harmful substances are filtered by a filter element, and filtered clean water is discharged from a water outlet of the filter. When the household water treatment filter is used for a period of time and the filter element absorbs impurities and harmful substances almost reach saturation, most machine types need to replace the filter element.

From government, city and national aspect, the water treatment aims at water bodies such as rivers, lakes and the like, and aims at improving and treating polluted or easily polluted water bodies and providing good living and production environments for people. The water treatment capacity of the water treatment filters employed is more significant in the removal of one or more of heavy metals, suspended matter, colloids, and other organic waste from the water body than in the treatment of water in units of households. When the impurities or adsorbates precipitated on the filter element are more, the pressure drop is increased, the filtration flow rate is reduced, and the water treatment speed and effect are affected. The filter element of the water treatment filter has large mass and volume, the filter element is not easy to be frequently replaced from the economical angle and the operation angle, but the filter element of the filter is frequently backwashed to remove impurities or adsorbates deposited on the filter element, so that the filter element can be repeatedly used, and the backwashed operation is usually required to be frequently carried out.

In order to realize the switching between the filtration water inlet and the backwashing of the filter, the common practice is to respectively set valve groups for the filtration water channel (filtration water inlet and filtration water outlet) and the backwashing water channel (backwashing water inlet and backwashing sewage outlet) of the filter, and operate each valve group to switch the water channel when required, wherein the switching mode between the filtration water channel and the backwashing water channel has no special requirement on the valve groups, but needs to be matched with a relatively complex pipeline, and a plurality of water flow splitters (such as a tee joint, a four-way joint and the like) are arranged, so that the water channel outside the filter is complex, the installation space is required to be large, the installation difficulty is large, the construction period is long, the manual operation is time-consuming and labor-consuming, and the subsequent overhaul and maintenance are also relatively complex.

The chinese patent application 92101886.X discloses a filter, wherein the connecting pipes of the filtering columns are connected in parallel through a control valve, the control valve is actually a multi-directional valve, and the relative positions of the valve casing and the valve core are adjusted to make the holes and grooves on the valve casing and the valve core communicate with the connecting pipes of the filtering columns, so as to switch between water producing, backwashing and normal water washing paths, and the control valve also needs to be matched with complex pipelines.

The prior art also discloses a gravity filter, which adopts the siphon principle to complete automatic switching between an automatic control filtering waterway and a backwashing waterway, and does not need to switch a valve of the waterway, such as China patent application 201110448643.9, wherein the gravity filter has simple control, but the same pipeline is complex, accessories are more, the requirement on the installation technology is higher, and the installation space is larger.

The Chinese patent No. ZL00221478.4 also discloses a single valve for switching the filtering waterway and the backwashing waterway of the filter, the valve comprises a hollow cylindrical valve body and a valve core which is arranged in the valve body and can rotate around the central line of the valve body, a water inlet, a standby water inlet and a backwashing water outlet (namely a sewage outlet) are arranged on the cylindrical peripheral surface of the valve body, a filtering water outlet is arranged on the end surface of the valve body, a through hole is arranged on the cylindrical peripheral surface of the valve core, and the through hole on the cylindrical peripheral surface of the valve core can be selectively aligned with one of the water inlet, the standby water inlet and the backwashing water outlet through the rotation of the valve core in the valve body so as to switch the waterway. When the filtering waterway is connected, water flow enters the valve body from a water inlet or a standby water inlet on the periphery of the valve body, and flows out from a water outlet on the end face of the valve body after being filtered; when the backwashing waterway is communicated, water flow enters the valve body from a water outlet on the end face of the valve body, and after the filter element is backwashed, the water is discharged from a backwashing water outlet on the peripheral face of the valve body. It can be seen that the water flow interface on the end face of the valve body is used as a filtering water outlet and a backwashing water inlet. At least two water dividing paths must be provided at the water flow interface on the end face of the valve body, one for filtering the water outlet and the other for providing the backwash inlet, and correspondingly, a control system or control device, such as an automatically or manually controlled on-off valve set, is provided for the two water paths. In general, in the working process of the valve, besides the rotation of the valve core, the forward and reverse control of the water flow direction at the water flow interface of the end face of the valve body is required, and the simplification degree of the waterway pipeline, the control system and the control method is limited.

Disclosure of Invention

In order to solve at least one of the above technical problems, the present invention provides a waterway switching valve, including: a valve body comprising a hollow housing, a hollow cylindrical valve core rotor comprising a rotor hollow cylindrical portion having a center line X and rotor first and second ends at opposite ends of the rotor hollow cylindrical portion, the valve core rotor being rotatably mounted in the housing about the center line X,

The shell is provided with a shell hollow part, a shell first end part and a shell second end part, wherein the shell first end part and the shell second end part are positioned at two opposite ends of the shell hollow part; wherein the first rotor end is proximate the first housing end and the second rotor end is proximate the second housing end;

The valve body further comprises: two valve body interfaces arranged on the first end part of the shell at 180 degrees intervals around the central line X, two valve body water outlets arranged oppositely in the circumferential direction of the hollow part of the shell, and a valve body water inlet positioned in the middle of the two valve body water outlets in the circumferential direction of the hollow part of the shell; one of the two valve body interfaces is connected with a filter water inlet interface of a filter, and the other of the two valve body interfaces is connected with a filter water outlet interface of the filter;

A rotor water inlet end hole and a rotor water outlet end hole are arranged on the first end part of the rotor at 180-degree intervals around the central line X; two rotor water inlets are oppositely arranged in the circumferential direction of the hollow cylindrical part of the rotor, and a rotor water outlet is arranged in the middle position between the two rotor water inlets;

The partition plate is arranged in the hollow cylindrical part of the rotor and divides the interior of the valve core rotor into a rotor water inlet chamber and a rotor water outlet chamber; the two rotor water inlets and the rotor water inlet end holes are positioned at one side of the rotor water inlet chamber and are communicated with the rotor water inlet chamber, and the rotor water outlet end holes are positioned at one side of the rotor water outlet chamber and are communicated with the rotor water outlet chamber;

when the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with one of the two valve body interfaces and the other of the two valve body interfaces, the valve body water inlet is aligned with one of the two rotor water inlets, the rotor water outlet is aligned with one of the two valve body water outlets, and the valve core rotor is positioned on a filtering station;

When the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with the other one of the two valve body interfaces and the other one of the two valve body interfaces, the valve body water inlet is aligned with the other one of the two rotor water inlets, the rotor water outlet is aligned with the other one of the two valve body water outlets, and the valve core rotor is positioned on a backwashing station.

Further, a valve body empty port is arranged opposite to the valve body water inlet in the circumferential direction of the hollow part of the shell, and the valve body empty port is a valve body standby water inlet or a valve body blind port which is not communicated with the outside.

Further, flange pipes protruding out of the shell are arranged at the water outlet of the two valve bodies, the water inlet of the valve body and the joint of the two valve bodies, the flange pipes are provided with a flange, and a plurality of bolt mounting through holes are formed in the flange.

Further, an end bushing is arranged at the joint of the two valve bodies at the first end part of the shell, the inner end surface of the end bushing is clung to the outer surface of the first end part of the rotor, and the rotor water inlet end hole and the rotor water outlet end hole are completely covered in the outer contour line range of the inner end surface of the end bushing, so that the rotor water inlet end hole and the rotor water outlet end hole are isolated from the space between the valve bodies and the valve core rotor;

the two valve body water outlets, the valve body water inlets and the valve body empty openings in the circumferential direction of the hollow part of the shell are provided with tubular circumferential bushings, the inner end surfaces of the circumferential bushings are clung to the outer circumferential surface of the rotor hollow cylindrical part on the filtering station or the backwashing station, and the two rotor water inlets and the rotor water outlets are completely covered in the outer contour line range of the inner end surfaces of the circumferential bushings, so that the two rotor water inlets and the rotor water outlets are isolated from the space between the valve body and the valve core rotor.

Further, a resilient biasing means applies a resilient biasing force to the spool rotor toward the first end of the housing on the outer surface of the second end of the rotor.

Further, on the outer end face of each bushing, a compression spring is provided to press the bushing against the spool rotor.

Further, the outer end face of the bushing, the compression spring, the bushing pressing plate and the adjusting screw are sequentially arranged, and the adjusting screw is arranged in a screw hole on the valve body.

Alternatively, the bushings are fixedly arranged on the inner wall of the pipe at the joint of the two valve bodies, the water outlet of the two valve bodies, the water inlet of the valve body and the empty opening of the valve body through interference fit.

To solve at least one of the above problems, optionally, the present invention provides a waterway switching valve, including: a valve body comprising a hollow housing, a hollow cylindrical valve core rotor comprising a rotor hollow cylindrical portion having a center line X and rotor first and second end portions at opposite ends of the rotor hollow cylindrical portion, the valve core rotor being rotatably mounted in the housing about the center line X',

The valve body further comprises: two valve body interfaces arranged on the first end part of the shell at 180 degrees intervals around the central line X, two valve body water outlets which are arranged oppositely in the circumferential direction of the hollow part of the shell, and two valve body water inlets which are arranged oppositely and positioned at the middle part between the two valve body water outlets; one of the two valve body interfaces is connected with a filter water inlet interface of a filter, and the other of the two valve body interfaces is connected with a filter water outlet interface of the filter;

A rotor water inlet end hole and a rotor water outlet end hole are arranged on the first end part of the rotor at 180-degree intervals around the central line X; a rotor water inlet and a rotor water outlet are arranged at intervals of 90 degrees in the circumferential direction of the hollow cylindrical part of the rotor;

The partition plate is arranged in the hollow cylindrical part of the rotor and divides the interior of the valve core rotor into a rotor water inlet chamber and a rotor water outlet chamber; the rotor water inlet and the rotor water inlet end hole are positioned at one side of the rotor water inlet chamber and are communicated with the rotor water inlet chamber, the valve body first water inlet and the valve body second water inlet are also positioned at one side of the water inlet chamber, and the rotor water outlet end hole are positioned at one side of the rotor water outlet chamber and are communicated with the rotor water outlet chamber;

when the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with one of the two valve body interfaces and the other of the two valve body interfaces, one of the two valve body water inlets is aligned with the rotor water inlet, one of the two valve body water outlets is aligned with the rotor water outlet, and the valve core rotor is positioned on a filtering station;

When the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with the other one of the two valve body interfaces and one of the two valve body interfaces, the other one of the two valve body water inlets is aligned with the rotor water inlet, the other one of the two valve body water outlets is aligned with the rotor water outlet, and the valve core rotor is positioned on a backwashing station.

Further, flange pipes protruding out of the shell are arranged at the water outlets of the two valve bodies, the water inlets of the two valve bodies and the joint of the two valve bodies, the flange pipes are provided with a flange, and a plurality of bolt installation through holes are formed in the flange.

the two valve body water outlets and the two valve body water inlets in the circumferential direction of the hollow part of the shell are provided with tubular circumferential bushings, the inner end surfaces of the circumferential bushings are clung to the outer circumferential surface of the hollow cylindrical part of the rotor on the filtering station or the backwashing station, and the rotor water inlet and the rotor water outlet are completely covered in the outer contour line range of the inner end surfaces of the circumferential bushings, so that the rotor water inlet and the rotor water outlet are isolated from the space between the valve body and the valve core rotor.

Further, the bushings are fixedly arranged on the inner walls of the pipes at the joint of the two valve bodies, the water outlet of the two valve bodies and the water inlet of the two valve bodies through interference fit.

In the waterway switching valve, one or two valve body water inlets communicated with external water and two valve body water outlets are arranged on the circumferential direction of the valve body, two valve body interfaces connected with a waterway of a water filter are arranged on one side of the valve body, a wading opening corresponding to the valve body is arranged on a valve core skillfully, and the forward and reverse switching of the water flow direction in the waterway switching valve is realized through the position change of the valve core in the valve body. Therefore, once the waterway switching valve is assembled with external water inflow and drainage pipelines and the filter and is debugged, the external waterway is not required to be switched and controlled in the use process, so that the work of operators and maintenance personnel is greatly simplified, the requirements on the operators are reduced, the requirements on a matched electrified or electronic control system are also reduced, the control method can be simplified, and the waterway switching valve is suitable for automatic control to a higher degree.

As another aspect of the present invention, there is provided an electric waterway switching valve including: the waterway switching valve is characterized in that an automatic calibration sensor and a first position mark are respectively arranged on the outer surfaces of a first end part of a shell and a first end part of a rotor or the outer surfaces of a cover plate of a second end part of the shell and a second end part of the rotor, and the induction head of the automatic calibration sensor faces the inside of a valve body; when the valve core rotor rotates to a first position mark at a first rotation speed and enters a preset induction range of the automatic calibration sensor, the automatic calibration sensor sends out a calibration signal.

Further, when the first position marker is aligned with the auto-calibration sensor, the spool rotor is in either the backwash station or the filtration station.

Further, a delay relay is electrically connected with the automatic calibration sensor and the motor, and after the automatic calibration sensor sends out a calibration signal, the delay relay delays for a preset calibration time, and in the preset calibration time, the motor drives the valve core rotor to rotate at a second rotation speed lower than the first rotation speed until the valve core rotor rotates to the backwashing station.

Further, a second position mark is also arranged on the valve core rotor, and the second position mark and the first position mark are positioned at the first end part of the rotor or the second end part of the rotor together and are separated by 180 degrees around the central line X.

Further, the auto-calibration sensor is a proximity sensor.

Further, the first location is marked as a protrusion protruding from the outer surface of the first end of the rotor or the outer surface of the second end of the rotor.

Further, a waterproof cover covers the head of the auto-calibration sensor to isolate it from the space between the valve body and the spool rotor.

According to the invention, the position calibration device is arranged on the electric waterway switching valve, so that the problem of deviation of the rotation angle/distance of the valve core in electric control rotation is effectively solved, when the valve core is about to reach a certain position, the valve core is calibrated, the relative rotation of the valve core relative to the valve body is ensured to be in a preset matching requirement range, and the accurate position correspondence of the wading opening on the valve core and the wading opening on the valve body is ensured. Through setting up this position calibration device, can carry out automatic calibration control through the procedure to the position of case, once the valve body assembly, installation, debugging finish the back, when the forward and reverse switching of water route at every turn, no longer need to align by hand, simplified the operation to electronic waterway switching valve, be suitable for high degree automated control.

As another aspect of the present invention, the present invention provides a calibration method of the electric waterway switching valve, including the following steps:

(1.1) when the first position mark rotates along with the valve core rotor at a first rotation speed within a preset induction range of the automatic calibration sensor, the automatic calibration sensor senses the approach of the first position mark and sends out a calibration signal;

And (1.2) after the control circuit receives the calibration signal, controlling the gear motor group to drive the valve core rotor to rotate slowly at a second rotating speed slower than the first rotating speed until the valve core rotor just rotates to the backwashing station or the filtering station.

Further, a delay relay is electrically connected with the automatic calibration sensor and the motor, in the step (1.2), after receiving the calibration signal, the control circuit controls the delay relay to start delaying for a preset calibration time, and in the preset calibration time of the delay relay, the speed reduction motor group drives the valve core rotor to rotate slowly at a second rotating speed slower than the first rotating speed until the valve core rotor just rotates to the backwashing station or the filtering station, and the delay is finished.

As still another aspect of the present invention, the present invention provides a backwash control method of the electric waterway switching valve, including the steps of:

(2.1) starting a speed reduction motor unit to drive the valve core rotor to rotate;

(2.2) when the valve core rotor rotates around the central line X to a certain angle range close to the backwashing station, carrying out backwashing station calibration until the valve core rotor is just positioned on the backwashing station;

(2.3) stopping the speed reducing motor group;

(2.4) the external water inflow enters the rotor water inflow cavity, flows into the water outlet end of the filter from the other one of the rotor water inflow end hole and the two valve body interfaces aligned with the rotor water inflow end hole and enters the filter, reversely washes the filter element, and the sewage flows out of the water inlet end of the filter, enters the rotor water outflow cavity through one of the two valve body interfaces and the rotor water outlet end hole aligned with the two valve body interfaces and is discharged from the valve body;

(2.5) after a preset backwashing time, stopping external water inflow when backwashing is completed.

Further, the water inlet of the valve body is connected with an output pipe of a water pump.

As still another aspect of the present invention, the present invention provides a filtration control method of the above electric waterway switching valve, including the steps of:

(3.1) starting a speed reduction motor unit on the backwashing station to drive the valve core rotor to rotate;

(3.2) the spool rotor rotates 180 degrees relative to the valve body about the centerline X;

(3.3) stopping the speed reducing motor group;

(3.4) the external water inflow enters the rotor water inflow cavity, flows into the filter water inflow end from one of the rotor water inflow end hole and the two valve body interfaces aligned with the rotor water inflow end hole, is filtered by the filter element, flows out of the filter water outflow end, enters the rotor water outflow cavity through the other of the two valve body interfaces and the rotor water outflow end hole aligned with the rotor water inflow end hole, and is discharged from the valve body;

(3.5) stopping the external inflow water flow after the preset filtering time.

By adopting the waterway switching valve, the relative position electric calibration of the valve body and the valve core is increased through the ingenious design of the structure, and the position calibration method, the backwashing control method and the filtering control method are assisted, so that the requirements of the waterway switching valve on a manual work and a control system are reduced, the work of operators is simplified, and the automation control degree of the waterway switching valve is improved.

Drawings

The invention is further described and illustrated below with reference to the accompanying drawings.

Fig. 1 is a schematic view of a waterway switching valve according to a preferred embodiment of the present invention, as viewed from a side of a valve body adapted to be coupled to a filter.

Fig. 2 is a schematic view of the waterway switching valve of the preferred embodiment of the present invention, as seen from the other side of the valve body.

Fig. 3 is a schematic view showing an internal structure of the waterway switching valve of the preferred embodiment of the present invention after a cover plate on a valve body is opened, wherein a spool rotor is at a filtering station.

Fig. 4 is a schematic view showing the internal structure of the waterway switching valve according to the preferred embodiment of the present invention after a cover plate on a valve body is opened, wherein a valve core rotor is at a backwash station.

Fig. 5 is a schematic structural view of a spool rotor of the waterway switching valve according to the preferred embodiment of the present invention.

Fig. 6 is a sectional view showing a construction of a waterway switching valve according to a preferred embodiment of the present invention, taken along A-A of fig. 1.

Fig. 7 is an enlarged view of region C in fig. 6.

Fig. 8, 9 and 10 are schematic views illustrating the matching of the first water inlet of the rotor and the bushing to illustrate the size requirement of the bushing.

FIG. 11 is a schematic view of a bushing assembly in other embodiments.

FIG. 12 is a schematic illustration of another arrangement of the positions of the first port of the valve body and the second port of the valve body in other embodiments.

Fig. 13 is a schematic view showing an internal structure of the waterway switching valve of the second preferred embodiment of the present invention after a cover plate on a valve body is opened, wherein a spool rotor is at a filtering station.

Fig. 14 is a schematic view showing an internal structure of the waterway switching valve of the second preferred embodiment of the present invention after a cover plate on a valve body is opened, wherein a spool rotor is at a backwash station.

Detailed Description

The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1,2 and 6, the waterway switching valve of the preferred embodiment of the present invention includes a valve body 1. The valve body 1 comprises a hollow cylindrical housing 10. The housing 10 has a housing hollow cylindrical portion 103, and a housing first end portion 101 and a housing second end portion located at opposite ends of the housing hollow cylindrical portion 103.

As shown in fig. 1, the waterway switching valve is schematically shown from the side of the valve body 1, which is suitable for being connected with a filter. The valve body 1 further comprises: a first valve body connection 15 and a second valve body connection 16 are provided on the first housing end 101 for connection to a filter in use. The first end portion 101 of the housing is preferably in a circular plate shape, and is circumferentially connected to the hollow cylindrical portion 103 of the housing, and the first end portion and the hollow cylindrical portion may be connected by welding or may be integrally formed. Preferably, the first valve body port 15 on the first end 101 of the housing is adapted to connect to the water inlet port of the filter and the second valve body port 16 is adapted to connect to the water outlet port of the filter. Preferably, the first connector 15 and the second connector 16 are respectively provided with a first connector flange pipe 150 and a second connector flange pipe 160 for actually connecting with the water inlet and outlet connectors of the filter. The first interface flange pipe 150 and the second interface flange pipe 160 respectively comprise a flange, and a plurality of through holes are formed in the flange, so that the valve body first interface 15 and the valve body second interface 16 can be detachably connected with water inlet and outlet interfaces of the interface flanges with the same specification on the filter respectively in a bolt connection mode, and can also be selectively detachably connected with water pipe connectors of the interface flanges with the same specification in a bolt connection mode.

The valve body 1 further comprises: a valve body drain port 11, a valve body water inlet 12, a valve body row filter port 13, and a valve body blind port 14 are provided in this order in the circumferential direction of the housing hollow cylindrical portion 103. Preferably, the four wading openings of the valve body are uniformly arranged at 90-degree intervals in the circumferential direction of the housing hollow cylindrical portion 103. The valve body sewage drain port 11, the valve body water inlet 12 and the valve body row filtering port 13 are respectively provided with a sewage drain flange pipe 110, a water inlet flange pipe 120 and a water drain flange pipe 130 so as to be detachably connected with a water pipe joint. The blind opening 14 of the valve body is provided with a blind opening pipe 140.

Preferably, the center lines of the valve body sewage drain port 11, the valve body first port 15, the valve body second port 16, the valve body row filter water port 13 and the center line of the housing hollow cylindrical portion 103 are all on the same plane.

Fig. 2 is a schematic view of the waterway switching valve from the other side of the valve body 1. As shown in fig. 2 and 6, the second end of the housing is in an open structure, a circular cover plate 5 is covered on the second end of the housing, and screws are connected with screw holes on the hollow cylindrical portion 103 of the housing through holes at the edge of the cover plate 5, so as to realize detachable connection between the cover plate 5 and the housing 10. On the outside of the cover plate 5 (the side of the cover plate facing the inside of the valve body is the inside, and the opposite side is the outside), there is provided a reduction motor unit for driving the valve core rotor to rotate, which will be described in further detail below.

The waterway switching valve of the preferred embodiment of the present invention further includes a hollow cylindrical valve core rotor 4 installed in the valve body 1.

Fig. 3 and 4 are schematic structural diagrams of the waterway switching valve according to the preferred embodiment of the present invention when the cover plate 5 on the valve body 1 is opened, and illustrate the waterway switching operation principle of the waterway switching valve according to the preferred embodiment of the present invention, in which the valve core rotor is located at a filtering station in fig. 3, and in which the valve core rotor is located at a backwashing station in fig. 4.

As shown in fig. 3 to 7, the spool rotor 4 has a rotor hollow cylindrical portion 43, and a rotor first end portion 41 and a rotor second end portion 42 connected to the hollow cylindrical portion 43. Wherein the rotor first end 4 is adjacent to the housing first end 101 and the rotor second end 42 is adjacent to the housing second end.

A rotor water inlet end hole 411 and a rotor water outlet end hole 412 are formed in the first end 41 of the rotor, and correspond to the opening positions of the first connector 15 and the second connector 16 of the valve body respectively. The rotor hollow cylindrical portion 43 has a center line X. The center line of the housing hollow cylindrical portion 103 coincides with the center line X of the rotor hollow cylindrical portion 43. It is to be noted that "overlapping" herein is not limited to absolute overlapping in theory, but means substantial overlapping that allows for tolerance, error, etc. in manufacturing and installation. The spool rotor 4 is rotatable in the housing 10 of the valve body 1 with respect to the housing 10 about the center line X. It will be appreciated by those of ordinary skill in the art that, based on the rotation of the spool rotor within the valve body relative to the valve body, in other embodiments, it is only necessary for the valve body to have a cylindrical inner peripheral surface within, and not necessarily a cylindrical outer surface.

Preferably, the rotor water inlet end hole 411 and the rotor water outlet end hole 412 are disposed opposite to each other around the center line X. The arrangement is such that when the spool rotor 4 rotates 180 degrees around the centre line X relative to the valve body 1, the positions of the rotor water inlet end hole 411 and the rotor water outlet end hole 412 still correspond to the valve body first interface 15 and the valve body second interface 16, but the positions of the rotor water inlet end hole 411 and the rotor water outlet end hole 412 are exchanged, so that the mating relationship between the rotor water inlet end hole 411 and the rotor water outlet end hole 412 and the valve body first interface 15 and the valve body second interface 16 is changed.

A rotor first water inlet 431, a rotor second water inlet 432, and a rotor water outlet 433 are sequentially opened in the circumferential direction of the rotor hollow cylindrical portion 43. Wherein, in the circumference of the rotor hollow cylinder 43, the rotor first water inlet 431 and the rotor second water inlet 432 are oppositely arranged around the central line X, and the rotor water outlet 433 is positioned between the rotor first water inlet 431 and the rotor second water inlet 432 and is equally angularly separated from the two.

Preferably, the openings of the valve body sewage draining nozzle 11, the valve body water inlet 12, the valve body row filtering nozzle 13, the valve body blind opening 14, the valve body first connector 15 and the valve body second connector 16 are the same in size; preferably, the openings of the rotor first water inlet 431, the rotor second water inlet 432 and the rotor water outlet 433 are the same in size, so that the processing of each wading opening on the valve body and the valve core rotor and the selection of interface parts and components are simplified. Those of ordinary skill in the art will appreciate that in other embodiments, the size of the wading openings on the valve body and the spool rotor may not be exactly the same.

Inside the rotor hollow cylindrical portion 43, a partition 44 is provided to divide the inner space of the rotor hollow cylindrical portion 43 into a rotor water inlet chamber 45 and a rotor water outlet chamber 46 that are isolated from each other. Wherein the first rotor water inlet 431, the second rotor water inlet 432 and the rotor water inlet hole 411 are positioned on one side of the rotor water inlet chamber of the partition plate 44 and are communicated with the rotor water inlet chamber 45; the rotor water outlet 433 and the rotor water outlet end hole 412 are positioned on one side of the rotor water outlet chamber of the partition plate 44 and are communicated with the rotor water outlet chamber 46.

A sleeve 48 is also provided in the central portion of the rotor hollow cylindrical portion 43 in the direction of the center line X for mounting the drive shaft 3.

Preferably, as shown in fig. 3 and 4, the partition 44 is formed in a central bulge shape in a direction perpendicular to the center line X, and the connecting lines of the two ends and the center thereof are respectively positioned at two sides of the center line X, so that the difference of mass distribution of the partition 44 at two sides of the center line X is reduced as much as possible, and the spool rotor 4 can be more stable in rotation. One of ordinary skill in the art will appreciate that in other embodiments, it is also possible to locate each portion of the separator on the same side of the centerline X.

As shown in fig. 3, when the spool rotor 4 is in the filtering position with respect to the housing 10 of the valve body 1, in the circumferential direction, the rotor first water inlet 431 and the valve body water inlet 12 are aligned and communicated, the rotor water outlet 433 and the valve body row water filtering ports 13 are aligned and communicated, the circumferential surface of the rotor hollow cylindrical portion 43 closes the valve body sewage discharge port 11, the rotor second water inlet 432 is aligned with the valve body blind port 14, wherein the valve body blind port 14 is closed, and at the rotor first end 41, the rotor water inlet end hole 411 is aligned and communicated with the valve body first port 15 connected to the water inlet end of the filter, and the rotor water outlet end hole 412 is aligned and communicated with the valve body second port 16 connected to the water outlet end of the filter. The external water inflow enters the rotor water inflow chamber 45 from the valve body water inlet 12 and the rotor first water inlet 411, flows out of the valve body 1 through the rotor water inflow end hole 411 and the valve body first connector 15 and enters the filter water inflow connector, filtered water flows out of the filter water outflow connector after being filtered by the filter element, enters the rotor water outflow chamber 46 through the valve body second connector 16 and the rotor water outflow end hole 412, and is discharged to the water body from the rotor water outlet 433 and the valve body water discharge filter nozzle 13. Between the valve body row filter water gap 13 and the water body, a filter water pipe is installed or not installed according to the requirements. The direction of water flow of the filter waterway in the valve body 1 is shown by an arrow in fig. 3.

In fig. 4, compared to fig. 3, the valve body 1 is stationary and the valve spool rotor 4 rotates 180 degrees around the center line X relative to the valve body 1, with the valve spool rotor 4 in the backwash position relative to the housing 10 of the valve body 1. At this time, in the circumferential direction, the rotor second water inlet 432 and the valve body water inlet 12 are aligned and communicated, the rotor water outlet 433 and the valve body drain 11 are aligned and communicated, the circumferential surface of the rotor hollow cylindrical portion 43 closes the valve body row of the filter water inlets 13, the rotor first water inlet 431 corresponds in position to the valve body blind opening 14, wherein the valve body blind opening 14 is closed, and at the rotor first end 41, the rotor water inlet end hole 411 is aligned and communicated with the valve body second interface 16 connected to the filter water outlet end, and the rotor water outlet end hole 412 is aligned and communicated with the valve body first interface 15 connected to the filter water inlet end. External water inflow enters the rotor water inflow chamber 45 from the valve body water inlet 12 and the rotor water inlet 432, flows out of the valve body 1 through the rotor water inflow end hole 411 and the valve body second connector 16, enters the filter from the filter water outlet connector, backflushes the filter core, flows out of the filter water inlet connector, flows into the rotor water outflow chamber 46 through the valve body first connector 15 and the rotor water outflow end hole 412, and is discharged into a sewage pool from the rotor water outlet 433 and the valve body sewage drain 11. Between the valve body sewage drain 11 and the sewage pool, a sewage pipe is installed or not installed as appropriate. The direction of water flow of the backwash waterway in the valve body 1 is shown by an arrow in fig. 4.

In this way, by controlling the relative rotation of the valve core rotor 4 in the housing 10 of the valve body 1, the valve core rotor 4 is switched between the filtration station and the backwash station, thereby realizing the switching of the waterway switching valve of the preferred embodiment of the present invention between the filtration mode and the backwash mode. And because the external water inflow of the water inlet of the valve body can be selectively led into one of the water inlet port and the water outlet port of the filter through the position change of the valve core which is a component of the waterway switching valve, meanwhile, the other of the water inlet port and the water outlet port of the filter discharges filtered water or sewage into the valve body and is discharged through the water outlet port of the valve body and the sewage outlet port of the valve body respectively. Therefore, in the use process, the external water inflow does not need to be replaced outside the waterway switching valve to enter the inlet of the waterway switching valve, and the water flow direction of each valve body interface in butt joint with an external water pipe or a filter on the valve body does not need to be changed, so that the waterway switching valve is beneficial to realizing the further simplification of the installation, the use and the maintenance of the waterway switching valve, improving the automation degree and simplifying the automatic control method.

As shown in fig. 6, the drive shaft 3 preferably includes a first journal 31, a shaft body 32, a shoulder 33, a second journal 34, and a head 35 in this order. Preferably, the diameter of the shaft body 32 is the largest, the diameter of the first journal 31 is smaller than the diameter of the shaft body 32, and the diameters of the shaft body 32, the second journal 34, and the stub shaft 35 are sequentially decreased.

A sleeve 48 is provided in the spool rotor 4 along the center line X direction. Preferably, the first shaft seat 104 is provided in the central part of the housing first end 101 of the valve body 1, and the first journal 31 of the drive shaft 3 is rotatably mounted in the shaft seat 104, preferably by means of bearings. Preferably, the axle seat 104 is a counterbore that is not in communication with the exterior. The shaft body 32 is fixed to the spool rotor 4 through the boss 48 of the spool rotor 4. Shoulder 33 rests on the outside of rotor second end 42. A sleeve 51 is fixed to the outer surface of the cover plate 5, a second bearing 52 being fixedly provided inside the sleeve 51, and the second journal 34 being rotatably mounted in the second bearing 52, preferably by means of bearings.

A reduction motor group including a motor 8 and a reduction gearbox 82 is provided on the outer side of the cover plate 5. The shaft head 35 of the transmission shaft 3 is fixedly abutted with the output shaft 83 of the reduction gearbox through the coupler 7, and when the reduction motor set is started, the transmission shaft 3 drives the valve core rotor 4 to rotate around the central line X.

Preferably, one end of the sleeve 51 is fixed to the outside of the cover plate 5 by welding, and the other end thereof is preferably provided with a flange to facilitate the detachable mounting of the housing of the reduction gearbox 82, so that the reduction gearbox output shaft 83 and the coupling 7 are both surrounded by the sleeve 51. Those of ordinary skill in the art will appreciate that in other embodiments, the connection between the sleeve and the cover plate, and gearbox is not limited to welding or flange connection, and that other suitable connection structures and means may be used.

Preferably, the sealing means 6 are provided in the sleeve 51 at the second hub 52. The sealing device 6 may be formed by one sealing member or may be formed by combining a plurality of parts. Therefore, water or water vapor in the valve body can be better isolated from the output shaft of the reduction gearbox, and the output shaft of the reduction gearbox can work without being influenced by the humid environment.

Preferably, between the shoulder 33 and the second seat 52, there is also provided a resilient biasing means 9 which applies a resilient biasing force to the shoulder 33 towards the housing first end 41 of the valve body 1, pressing the spool rotor 4 towards the housing first end 41. Preferably, the resilient biasing means 9 comprises a spring which is fitted over the second journal 34. The spring is located between the shoulder 33 and the second hub 52 in a compressed state. Those of ordinary skill in the art will appreciate that in other embodiments, the contact between the two ends of the spring need not be in accordance with the preferred embodiment, for example, but not limited to, directly pressing against the outer surface of the second end of the valve core rotor, as long as the resilient biasing means applies a biasing force to the valve core rotor that is biased toward the first end 41 of the housing, and that various suitable forms and configurations of resilient biasing means may be employed.

The waterway switching valve is suitable for large-caliber pipelines and small-caliber pipelines, and the valve core rotor and the valve body are made of metal materials. In order that the valve core rotor 4 can smoothly rotate in the housing 10 of the valve body, a gap is left between the outer surface of the valve core rotor 4 and the inner surface of the housing 10 of the valve body 1 to prevent friction therebetween from affecting the rotation of the valve core rotor. Meanwhile, in order to prevent water in the valve core rotor from leaking in the backwashing process or the filtering process, bushing assemblies 18 are arranged at the positions of the valve body sewage draining water port 11, the valve body water inlet 12, the valve body row filtering water port 13, the valve body blind port 14, the valve body first connector 15 and the valve body second connector 16.

As shown in fig. 6 and 7, the bushing assembly is illustrated at the valve body water inlet 12. In the preferred embodiment, the bushing assembly 18 comprises: a bushing 181, springs 182, press plates 183, and adjustment screws 184. The bushing 181 is fitted against the pipe inner wall at the valve body water inlet 12, the inner end face of the bushing 181 (the end face of the bushing facing the valve body interior is the "inner end face") is in contact with the outer peripheral face of the rotor hollow cylindrical portion 43, a spring 182 is provided on the outer end face of the bushing 181, and the pressing plate 183 presses the spring 182 against the bushing 181 by applying pressure to the spring 182, thereby pressing the inner end face of the bushing 181 against the outer peripheral face of the rotor hollow cylindrical portion 43. The size and the number of the springs are selected according to actual needs. An adjusting screw 184 is installed at the outer end of the pipe at the water inlet 12 of the valve body, and is connected to and passes through a screw hole on the outer end of the pipe at the water inlet 12 of the valve body, the adjusting screw 184 is propped against a pressing plate 183, and the pressure of the spring 182 to the bushing 181 is adjusted by screwing in or screwing out the adjusting screw 184.

Obviously, the valve body sewage drain port 11, the valve body water inlet 12, the valve body row filtering water port 13 and the bushing 181 at the valve body blind port 14 are tightly attached to the outer peripheral surface of the rotor hollow cylindrical part 43; the bushings 181 at the first and second valve body interfaces 15, 16 abut against the outer surface of the rotor first end 41 of the spool rotor 4, and the resilient biasing device 18 described above also further biases the spool rotor 4 against the bushings in the bushing assembly at the first and second valve body interfaces 15, 16.

Preferably, for convenience of manufacture and matching with standard parts on the market, the wading openings in the hollow cylindrical part 103 of the housing of the valve body 1 are all round through holes with uniform dimensions, and the bushings 181 at the wading openings are round tubes. Preferably, as shown in fig. 7, the diameters of the first water inlet of the rotor, the second water inlet of the rotor and the water outlet of the rotor are equivalent to the inner diameter of the lining at the wading opening on the hollow cylindrical part 103 of the shell of the valve body 1.

Those skilled in the art will appreciate that in the preferred and other embodiments, the bushings at the valve body drain 11, the valve body inlet 12, the valve body row filter 13, and the blind 14 meet the following conditions: when the valve core rotor 4 rotates to the filtering station or the backwashing station, the wading opening (namely, a rotor first water inlet, a rotor second water inlet and a rotor water outlet) on the rotor hollow cylinder part at a certain bushing is completely covered in the range of an outer contour line 185 of the inner end surface of the bushing, namely: at this time, the inner end surface of the liner is at least partially fitted to the outer circumferential surface of the hollow cylindrical portion of the housing in 360 degrees around the center line of the liner itself, as shown in fig. 8, 9 and 10 by way of example, the first water inlet 431 of the rotor is fitted to the liner 181. This state is called that the wading opening on the rotor hollow cylindrical portion is aligned with the bushing position in the circumferential direction of the valve body. After the valve core rotor rotates to the filtering station or the backwashing station and is static, the inner end surfaces of the bushings can be in seamless close contact with the outer peripheral surface of the rotor hollow cylindrical part of the valve core rotor all the time, the water-through opening in the circumferential direction of the valve core rotor is isolated from the gap between the valve body and the valve core rotor, and the possibility of water leakage is greatly reduced.

Because four groups of bushing assemblies are uniformly arranged on the periphery of the valve core rotor 4, the valve core rotor 4 is subjected to balanced pressure in the periphery, and the valve core rotor rotates smoothly. It will be appreciated by those skilled in the art that in other embodiments, the valve body blind port in the preferred embodiment may also be configured as a through hole and serve as a valve body back-up water inlet.

Preferably, the openings of the first end 101 of the housing, i.e. the first port 15 and the second port 16 of the valve body, are circular through holes of the same size, and the bushings at the openings of the housing are circular. Preferably, the diameters of the rotor water inlet end hole and the rotor water outlet end hole are equivalent to the inner diameter of the bushing at the wading opening on the first end 101 of the housing of the valve body 1.

Those skilled in the art will appreciate that in the preferred and other embodiments, the bushing at the wading opening in the housing first end 101 of the valve body 1 will only satisfy the following conditions: the rotor water inlet end hole and the rotor water outlet end hole on the rotor first end 41 are respectively covered in the outer contour line range of the inner end surface of one bushing, namely: the inner end surfaces of these bushings at least partially conform to the outer surface of the first end in the housing in 360 degrees about their own center line. This condition is referred to as the wading opening on the first end of the rotor being aligned with the bushing position on the first end of the housing of the valve body. The inner end surfaces of the bushings can be in seamless close contact with the outer surface of the first end part of the rotor of the valve core rotor all the time, the water inlet port and the water outlet port of the rotor are isolated from gaps between the valve body and the valve core rotor, and the possibility of water leakage is greatly reduced.

In the preferred embodiment, the bushing is preferably made of nylon, which has a hardness less than the hardness of the metal material used for the valve spool rotor 4, and even if the valve is slightly worn by the valve spool rotor during operation, the bushing is continuously pressed against the valve spool rotor by the spring in the bushing assembly. And in particular, after the running-in period, the lining and the valve core rotor are well attached. In addition to nylon materials, in other embodiments, the bushings may be copper or PVC plastic, etc.

In another embodiment, as shown in fig. 11, the bushing assembly 18' may include only a bushing 181 and a spring 182, the spring 182 being located between the inner wall of the pipe of each wading opening in the valve body and the outer end face of the bushing 181, pressing the bushing 181 against the spool rotor.

In other embodiments, the bushing assembly may further comprise only a bushing, the bushing is connected to the inner wall of the pipe for mounting the bushing by interference fit, during assembly, the bushing at the blind opening of the valve body may be knocked into the inner wall of the pipe from the inside of the valve body, while other bushings may be knocked into the valve body from the outside of the valve body so as to tightly abut against the valve core rotor, and the fitting force between the valve core rotor and the bushing is adjusted to a proper degree by running of the valve core rotor during the running-in period. In the process of driving the valve core rotor to rotate by the speed reduction motor unit, certain rotation deviation exists frequently, for example, after one turn or several turns, certain deviation exists between the actual rotation angle of the output shaft 83 and the rotation angle, so that a circumferential staggered distance exists between each wading opening on the valve core rotor and each wading opening on the hollow cylindrical peripheral surface of the shell of the valve body. If such rotational deviations are not corrected, the circumferential offset distance eventually becomes progressively larger until, in theory, the spool rotor should be turned to the filtration or backwashing station, in fact, the spool rotor is not in place, resulting in the outer contour of the inner end face of the bushing not completely covering the respective wading openings in the outer peripheral face of the hollow cylindrical portion of the rotor, but rather in the presence of gaps, which lead to a relatively pronounced leakage of water during operation of the valve.

In order to better control the switching accuracy of the spool rotor between successive stations, the waterway switching valve of the present invention is also provided with a self-calibrating sensor 2 located on the housing first end 101 of the valve body, and a position mark 22 located on the spool rotor first end 41. When the spool rotor 4 rotates, the position mark 22 rotates together therewith, and the rotational path of the position mark 22 passes through the sensing area of the sensing head of the auto-calibration sensor 2. Control of the sensing area range (i.e., the sensing distance) of the sensing head of the auto-calibration sensor 2 may be achieved by selecting an appropriate model or preset by a program as needed.

Preferably, the automatic calibration sensor 2 is inserted into the fixing seat 23, the fixing seat 23 is detachably mounted in the mounting hole on the first end 101 of the housing through a screw, the sensing end of the automatic calibration sensor 2 faces the first end 41 of the rotor, and a waterproof cover 21 clamped on the inner side (the side facing the inside of the valve body) of the fixing seat 23 isolates the sensing end of the automatic calibration sensor 2 from the water vapor in the valve body, so that the damage rate is low, the service life is long, and the sensitivity is high. The auto-calibration sensor is electrically connected to a control circuit (not shown).

It will be appreciated by those of ordinary skill in the art that in other embodiments, the self-calibrating sensor, the position marker may be mounted on the cover plate and the rotor second end, respectively.

The position calibration method of the valve core rotor comprises the following steps:

(1.1) when the position mark 22 rotates along with the spool rotor 4 at a first rotation speed within a preset sensing range of the automatic calibration sensor 2, the automatic calibration sensor 2 senses the approach of the position mark 22 and sends out a calibration signal;

And (1.2) after receiving the calibration signal, the control circuit controls the speed reduction motor group to drive the valve core rotor 4 to rotate slowly at a second rotating speed slower than the first rotating speed until the valve core rotor 4 just rotates to the backwashing station or the filtering station.

The calibration to case rotor position can realize on backwash station or filtration station, and the wading opening on rotor hollow cylinder 4 aligns with the bush position in the valve body circumference, and outside inflow water flow and the filtration water or backwash sewage that will discharge the valve body can not leak into the space between valve body and the case rotor.

The position calibration of the valve core rotor corrects the action deviation at the output shaft of the reduction gearbox, which occurs in the operation process of the reduction electronic group, so that the deviation is not accumulated; and no matter where the valve core rotor stays, the position calibration can be necessarily performed as long as the valve core rotor rotates one turn after the motor is started, and in case of emergency, for example, sudden power failure or forced shutdown of the device due to faults and the like, complex operation caused by uncertainty of the stay position of the valve core rotor is avoided, and manual debugging is not needed when the valve is restarted.

Preferably, the sensing end of the sensor 2 is aligned with the position mark 22 at the backwash or filtration station.

Preferably, the valve core rotor 4 is calibrated once per revolution, one of the backwash and filtration stations is calibrated, and the other of the backwash and filtration stations is substantially aligned by controlling the angle through which the gearbox output shaft rotates.

It will be appreciated by those of ordinary skill in the art that in other embodiments, two auto-calibration sensors or two position markers may be provided, the spool rotor being calibrated once per half turn to achieve rotation to align the backwash and filtration stations, respectively, during one rotation of the spool rotor.

Preferably, the position mark 22 is a protrusion protruding from the outer surface of the first end 41 of the rotor. The auto-calibration sensor 2 can sense every time the protrusion rotates into the sensing area of the auto-calibration sensor 2.

Preferably, the automatic calibration sensor 2 is a proximity sensor, and an electronic component such as a high-precision time delay relay (not shown) is connected in a matching manner in the control circuit. In the step (1.2), after receiving the calibration signal, the control circuit controls the high-precision delay relay to start delay, and in the delay time of the high-precision delay relay, the speed reduction motor group drives the valve core rotor 4 to rotate slowly at a second rotating speed slower than the first rotating speed until the valve core rotor 4 just rotates to a backwashing station or a filtering station, and the delay is finished. Preferably, the delay time of the high-precision delay relay is determined through debugging, so that the valve core rotor can be guaranteed to rotate in place within the delay time, and the delay time is generally not changed after the debugging is finished.

It will be appreciated by those of ordinary skill in the art that in other embodiments, the self-calibrating sensor may be any other suitable type and form of sensing switch or sensing device, and the position marker may be any other suitable structure and form, so long as the sensing switch or sensor is capable of sensing the proximity of the position marker, or even the distance therebetween.

The waterway switching valve can be automatically switched among different functions by combining with the control of a PLC program, so that automatic operation is truly achieved, and a large amount of manpower and material resources are saved.

It will be appreciated by those skilled in the art that the automatic calibration device of the preferred embodiment, which includes a position marker, an automatic calibration sensor, may be used in other embodiments than the waterway switching valve of the preferred embodiment, as long as the valve core rotor of a certain water valve rotates within the valve body relative to the valve body and the angle of rotation of the valve core rotor relative to the valve body needs to be controlled.

In various embodiments of the present invention, a variety of suitable reduction mechanisms may be employed in the reduction gearbox, including, but not limited to: worm gear reducer, rack and pinion reducer, belt-type reducer and the like

The backwash control process of the waterway switching valve in the preferred embodiment of the invention is as follows:

(2.1) starting a speed reduction motor group to drive the valve core rotor 4 to rotate;

(2.2) when the valve core rotor 4 rotates around the central line X to a certain angle range close to the backwashing station, carrying out backwashing station calibration until the valve core rotor 4 is just positioned on the backwashing station;

(2.3) stopping the speed reducing motor group;

(2.4) the external water inflow enters the rotor water inflow chamber 45 in the rotor of the valve core from the valve body water inlet 12 and the rotor second water inlet 432 matched with the valve body water inlet, flows into the filter water outlet end from the rotor water inflow end hole 411 and the valve body second connector 16 matched with the valve body water inlet and enters the filter interior, reversely washes the filter core, and the sewage flows out of the filter water inlet end, enters the rotor water outlet chamber 46 through the valve body first connector 15 and the rotor water outlet end hole 412 matched with the valve body water outlet 433 and the valve body sewage draining nozzle 11 matched with the valve body water outlet, and is discharged from the rotor water outlet 433 and the valve body sewage draining nozzle 11 matched with the valve body sewage draining nozzle as shown in fig. 4;

(2.5) stopping the external inflow water flow when the backwashing is completed.

Preferably, it is determined whether the backwash process is completed or not in order to determine whether a preset backwash time is reached.

Preferably, the on-off of external water inflow at the water inlet of the valve body is controlled by controlling the start and stop of the water suction pump, and the start and stop of the speed reducing motor group and the start and stop of the water suction pump can be realized by the control of a PLC program.

The filtering control process of the waterway switching valve in the preferred embodiment of the invention is as follows:

(3.1) starting a speed reduction motor unit to drive the valve core rotor to rotate;

(3.3) stopping the speed reducing motor group;

(3.4) external water inflow enters the rotor water inflow chamber 45 in the rotor of the valve core from the valve body water inlet 12 and the rotor first water inlet 431 matched with the valve body water inlet, flows into the filter water inlet end from the rotor water inlet end hole 411 and the valve body first connector 15 matched with the valve body water inlet end into the filter, is filtered by the filter core, flows out of the filter water outlet end, enters the rotor water outlet chamber 46 through the valve body second connector 16 and the rotor water outlet end hole 412 matched with the valve body water outlet end, and is discharged from the rotor water outlet 433 and the valve body row filter water outlet 13 matched with the valve body water outlet end, as shown in fig. 3;

(3.5) stopping the external inflow water flow when the filtration is completed.

Preferably, the rotation of the valve core rotor by 180 degrees about the center line X relative to the valve body is controlled by a further delay time of the high-precision delay relay, which is turned 180 degrees to the filter station at the end of the further delay time without taking account of the deviation of the action of the output of the reduction motor unit. It will be appreciated by those skilled in the art that in other embodiments, the angular control of the rotation of the spool rotor relative to the valve body may be accomplished in other ways, such as by providing the filter station with another position mark, and performing a position calibration of the filter operation.

Preferably, it is determined whether the filtering process is completed or not in order to determine whether a preset filtering time is reached.

It will be appreciated by those skilled in the art that in other embodiments, the plane F where the center lines of the first valve body interface and the second valve body interface are located intersects with the plane E where the center lines of the drain ports, the filter ports of the valve body row, and the hollow cylindrical portion of the housing are located, but as shown in fig. 12, as long as the valve core rotor is located at the backwash station and the filter station, the first valve body interface and the second valve body interface are still located at two sides of the partition board, and the positions of the water inlet end hole and the water outlet end hole of the rotor matched with the first valve body interface and the second valve body interface are correspondingly changed.

It will be further understood by those skilled in the art that in other embodiments, the first valve body connector and the second valve body connector in the preferred embodiment may be connected to the water outlet end of the filter and the water inlet end of the filter respectively, and accordingly, the functions of the drain valve body water outlet and the drain valve body drainage water outlet in the preferred embodiment may be exchanged with each other, so as to form the drain valve body drainage water outlet and the drain valve body water outlet in other embodiments.

It should be noted that the terms "first," "second," and the like in the description, summary, and claims do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Fig. 13 and 14 are schematic views showing the internal structure of the waterway switching valve of the second preferred embodiment of the present invention after the cover plate on the valve body is opened, wherein the valve core rotor is in a filtering position in fig. 13, and the valve core rotor is in a backwashing position in fig. 14.

As shown in fig. 13, the waterway switching valve of the second preferred embodiment of the present invention includes: a valve body comprising a hollow cylindrical housing, a hollow cylindrical spool rotor.

Wherein, the hollow cylindrical shell of the valve body is provided with a shell hollow cylindrical part 103', and the valve core rotor 4' is arranged in the shell and can rotate around the valve core rotor central line X 'relative to the shell hollow cylindrical part 103'; the housing has a housing first end and a housing second end at opposite ends of the housing hollow cylindrical portion 103', and correspondingly, the spool rotor further includes a rotor first end and a rotor second end at opposite ends of the rotor hollow cylindrical portion.

As in the preferred embodiment, the waterway switching valve of the second preferred embodiment is provided with a valve body first port and a valve body second port on the first end of the housing at 180 degrees apart around the center line X' for connection with the filter water inlet port and the filter water outlet port of the filter, respectively.

As in the preferred embodiment, a rotor inlet port 411' and a rotor outlet port 412' are provided at 180 degrees about the centerline X on the rotor first end of the spool rotor 4' and are respectively corresponding and communicating with the valve body first port and the valve body second port location at the filtration station or with the valve body second port and the valve body first port location at the backwash station; a partition 44' is provided in the rotor hollow cylindrical portion to divide the valve core rotor interior into a rotor water inlet chamber 45' and a rotor water outlet chamber 46'.

Unlike in the preferred embodiment, in the second preferred embodiment, the blind opening of the valve body in the preferred embodiment is changed into a second water inlet of the valve body, and the circumference of the hollow cylindrical part of the rotor is reduced by one rotor water inlet, namely: the periphery of the hollow cylindrical part 103' of the shell is sequentially provided with a valve body sewage drain port 11', a valve body first water inlet 12', a valve body row filtering water port 13' and a valve body second water inlet 14' at intervals of 90 degrees; correspondingly, rotor water inlets 431 'and rotor water outlets 433' are provided at intervals of 90 degrees in the circumferential direction of the rotor hollow cylindrical portion. Wherein, with respect to the partition plate 44', the rotor water inlet 431' and the rotor water inlet 411' are both positioned at one side of the water inlet chamber 45' and are communicated with the water inlet chamber 45', and the rotor water outlet 433' and the rotor water outlet 412' are both positioned at one side of the water outlet chamber 46' and are communicated with the water outlet chamber 46 '. A bushing as described in the previous embodiment is also mounted in each wading opening in the valve body to isolate the water flow from the space between the valve body and the spool rotor. The mounting structure, rotation driving, automatic calibration device, connection between the valve body and the external water pipe, etc. of the valve core rotor can be the same as those described in the foregoing embodiments, and the calibration method of the valve core rotor is also the same as described above.

In the filtering station shown in fig. 13, the rotor water inlet hole 411' corresponds to and communicates with the first connector position of the valve body, the rotor water inlet 431' corresponds to and communicates with the first water inlet 12' of the valve body, the rotor water outlet 433' corresponds to and communicates with the second connector position of the valve body, the rotor water outlet hole 412' corresponds to and communicates with the second connector position of the valve body, the water flow direction is shown by an arrow in fig. 13, the water enters from the first water inlet 12' of the valve body, enters the filter element through the rotor water inlet 431', the rotor water inlet hole 411', the first connector of the valve body and the filter water inlet, and after being filtered by the filter element, the filtered water passes through the filter water outlet, the second connector of the valve body, the rotor water outlet hole 412' and the rotor water outlet 433', and is discharged from the filter water outlet 13' of the valve body.

When the spool rotor rotates 180 degrees relative to the valve body, in the backwashing station shown in fig. 14, the rotor water inlet 411' corresponds to and communicates with the valve body second connector position, the rotor water inlet 431' corresponds to and communicates with the valve body second water inlet 14', the rotor water outlet 433' corresponds to and communicates with the valve body sewage drain 11', the rotor water outlet 412' corresponds to and communicates with the valve body first connector position, the water flow direction is shown by the arrow in fig. 14, the water enters from the valve body second water inlet 14', enters the filter element through the rotor water inlet 431', the rotor water inlet 411', the valve body second connector and the filter water outlet, and after backwashing the filter element, the backwash sewage is discharged from the valve body sewage drain 11' through the filter water inlet, the valve body first connector, the rotor water outlet 433 '.

The waterway switching valve in the second preferred embodiment is provided with two water inlets on the valve body, which are respectively used for filtering inflow water and backwashing inflow water, so that the filtering inflow water and the backwashing inflow water enter the valve from two wading openings on the valve body, different water sources are conveniently adopted for filtering and backwashing, for example, the filtering inflow water is water needing filtering treatment, the backwashing inflow water adopts clean clear water to improve backwashing efficiency and shorten backwashing operation time, and because the water needing filtering treatment and the clean clear water are often not in the same place, different water pumps are preferably arranged for different water sources, so that the water pumps are not required to be moved or the connection of the water pipes of the water pumps on the valve body is not required to be changed in the circulating operation of filtering, backwashing, filtering and … …, the requirements on operators are reduced, and the operation difficulty is reduced.

The backwash control method of the electric waterway switching valve configured after adding the speed reduction motor group driving device to the waterway switching valve in the second preferred embodiment includes the following steps:

(2.1') starting a speed reduction motor group to drive the valve core rotor to rotate;

(2.2 ') when the valve core rotor rotates around the central line X' to a certain angle range close to the backwashing station, carrying out backwashing station calibration until the valve core rotor is just positioned on the backwashing station;

(2.3') stopping the gear motor group;

(2.4 ') the external water inlet flow enters the rotor water inlet chamber 45' from the valve body second water inlet 14' and the rotor water inlet 431' aligned with the valve body second water inlet, flows into the filter water outlet end from the rotor water inlet end hole 411' and the valve body second interface aligned with the valve body second water inlet, enters the filter interior, backflushes the filter element, and the sewage flows out of the filter water inlet end, enters the rotor water outlet chamber 46' through the valve body first interface and the rotor water outlet end hole 412' aligned with the valve body first interface, and is discharged from the rotor water outlet 433' and the valve body sewage drain 11' aligned with the valve body water outlet;

(2.5') after a preset backwash time, stopping the external inflow water flow when the backwash is completed.

Wherein the second water inlet of the valve body is connected with a second water pump output pipe, and the first water inlet of the valve body is connected with the first water pump output pipe.

The filtration control method of the electric waterway switching valve configured after adding the speed reduction motor group driving device to the waterway switching valve in the second preferred embodiment includes the following steps:

(3.1') starting a speed reduction motor unit on the backwashing station to drive the valve core rotor to rotate;

(3.2') the spool rotor rotates 180 degrees about the centerline X relative to the valve body;

(3.3') stopping the gear motor group;

(3.4 ') the external water inlet flow enters the rotor water inlet chamber 45' from the first water inlet 12' of the valve body and the rotor water inlet 431' aligned with the first water inlet, flows into the filter water inlet end from the rotor water inlet end hole 411' and the first valve body interface aligned with the first water inlet end, enters the filter interior, is filtered by the filter element, flows out of the filter water outlet end, enters the rotor water outlet chamber 46' through the second valve body interface and the rotor water outlet end hole 412' aligned with the second valve body interface, and is discharged from the rotor water outlet 433' and the valve body row filter water outlet 13' aligned with the second valve body interface;

(3.5') after a preset filtration time, stopping the external inflow of water when the filtration is completed.

The above detailed description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Various modifications, substitutions and improvements of the technical scheme of the present invention will be apparent to those skilled in the art from the description and drawings provided herein without departing from the spirit and scope of the invention. The scope of the invention is defined by the claims.

Claims

1. A waterway switching valve, comprising: a valve body comprising a hollow housing, a hollow cylindrical valve core rotor comprising a rotor hollow cylindrical portion having a center line X and rotor first and second ends at opposite ends of said rotor hollow cylindrical portion, said valve core rotor being rotatably mounted in said housing about said center line X, characterized in that,

The shell is provided with a shell hollow part, a shell first end part and a shell second end part, wherein the shell first end part and the shell second end part are positioned at two opposite ends of the shell hollow part; wherein the rotor first end is proximate the housing first end and the rotor second end is proximate the housing second end;

a rotor water inlet end hole and a rotor water outlet end hole are arranged on the first end part of the rotor at 180-degree intervals around the central line X; two rotor water inlets are oppositely arranged on the circumference of the rotor hollow cylindrical part, and a rotor water outlet is arranged in the middle position between the two rotor water inlets;

The partition plate is arranged in the hollow cylindrical part of the rotor and divides the interior of the valve core rotor into a rotor water inlet chamber and a rotor water outlet chamber; the two rotor water inlets and the rotor water inlet end hole are positioned at one side of the rotor water inlet chamber and are communicated with the rotor water inlet chamber, and the rotor water outlet end hole are positioned at one side of the rotor water outlet chamber and are communicated with the rotor water outlet chamber;

when the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with one of the two valve body interfaces and the other of the two valve body interfaces, the valve body water inlet is aligned with one of the two rotor water inlets, the rotor water outlet is aligned with one of the two valve body water outlets, and at the moment, the valve core rotor is positioned on a filtering station;

When the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with the other of the two valve body interfaces and one of the two valve body interfaces, the valve body water inlet is aligned with the other of the two rotor water inlets, the rotor water outlet is aligned with the other of the two valve body water outlets, and at the moment, the valve core rotor is positioned on a backwashing station;

A valve body empty port is arranged on the circumference of the hollow part of the shell opposite to the valve body water inlet, and is a valve body standby water inlet or a valve body blind port which is not communicated with the outside; an end bushing is arranged at the joint of the two valve bodies at the first end part of the shell, the inner end surface of the end bushing is clung to the outer surface of the first end part of the rotor, and the rotor water inlet end hole and the rotor water outlet end hole are completely covered in the outer contour line range of the inner end surface of the end bushing, so that the rotor water inlet end hole and the rotor water outlet end hole are isolated from the space between the valve body and the valve core rotor;

The two valve body water outlets, the valve body water inlets and the valve body empty openings in the circumferential direction of the hollow part of the shell are provided with tubular circumferential bushings, the inner end surfaces of the circumferential bushings are tightly attached to the outer circumferential surface of the hollow cylindrical part of the rotor on the filtering station or the backwashing station, and the two rotor water inlets and the rotor water outlets are completely covered in the outer contour line range of the inner end surface of the circumferential bushings, so that the two rotor water inlets and the rotor water outlets are isolated from the space between the valve body and the valve core rotor.

2. The waterway switching valve of claim 1, wherein flange pipes protruding from the shell are arranged at the positions of the two valve body water outlets, the valve body water inlets and the two valve body interfaces, the flange pipes are provided with a flange, and the flange is provided with a plurality of bolt mounting through holes.

3. The waterway switching valve of claim 1, wherein a resilient biasing device applies a resilient biasing force to the spool rotor toward the first end of the housing on an outer surface of the second end of the rotor.

4. The waterway switching valve of claim 1, wherein a compression spring is provided on an outer end surface of each bush to press the bush against the spool rotor.

5. The waterway switching valve of claim 4, wherein the outer end surface of the bushing, the compression spring, the bushing pressing plate, and the adjusting screw are sequentially disposed, and the adjusting screw is installed in a screw hole on the valve body.

6. The waterway switching valve of claim 1, wherein each bushing is fixedly mounted to the tube inner wall at the two valve body interfaces, the two valve body drain ports, the valve body water inlet, and the valve body empty port by an interference fit.

7. A waterway switching valve, comprising: a valve body comprising a hollow housing, a hollow cylindrical valve core rotor comprising a rotor hollow cylindrical portion having a center line X and rotor first and second ends at opposite ends of said rotor hollow cylindrical portion, said valve core rotor being rotatably mounted in said housing about said center line X',

A rotor water inlet end hole and a rotor water outlet end hole are arranged on the first end part of the rotor at 180-degree intervals around the central line X; a rotor water inlet and a rotor water outlet are arranged at intervals of 90 degrees in the circumferential direction of the rotor hollow cylindrical part;

When the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with one of the two valve body interfaces and the other of the two valve body interfaces, one of the two valve body water inlets is aligned with the rotor water inlet, one of the two valve body water outlets is aligned with the rotor water outlet, and at the moment, the valve core rotor is positioned on a filtering station;

When the rotor water inlet end hole and the rotor water outlet end hole are respectively aligned with the other of the two valve body interfaces and one of the two valve body interfaces, the other of the two valve body water inlets is aligned with the rotor water inlet, the other of the two valve body water outlets is aligned with the rotor water outlet, and at the moment, the valve core rotor is positioned on a backwashing station;

An end bushing is arranged at the joint of the two valve bodies at the first end part of the shell, the inner end surface of the end bushing is clung to the outer surface of the first end part of the rotor, and the rotor water inlet end hole and the rotor water outlet end hole are completely covered in the outer contour line range of the inner end surface of the end bushing, so that the rotor water inlet end hole and the rotor water outlet end hole are isolated from the space between the valve body and the valve core rotor;

The two valve body water outlets and the two valve body water inlets in the circumferential direction of the hollow part of the shell are provided with tubular circumferential bushings, the inner end surfaces of the circumferential bushings are clung to the outer circumferential surface of the hollow cylindrical part of the rotor in the filtering station or the backwashing station, and the rotor water inlet and the rotor water outlet are completely covered in the outer contour line range of the inner end surface of the circumferential bushings, so that the rotor water inlet and the rotor water outlet are isolated from the space between the valve body and the valve core rotor.

8. The waterway switching valve of claim 7, wherein flange pipes protruding from the shell are arranged at the water outlets of the two valve bodies, the water inlets of the two valve bodies and the joint of the two valve bodies, the flange pipes are provided with a flange, and the flange is provided with a plurality of bolt mounting through holes.

9. The waterway switching valve of claim 7, wherein a resilient biasing device applies a resilient biasing force to the spool rotor toward the first end of the housing on an outer surface of the second end of the rotor.

10. The waterway switching valve of claim 7, wherein a compression spring is provided on an outer end surface of each bush to press the bush against the spool rotor.

11. The waterway switching valve of claim 10, wherein the outer end surface of the bushing, the compression spring, the bushing pressing plate, and the adjusting screw are sequentially disposed, and the adjusting screw is installed in a screw hole on the valve body.

12. The waterway switching valve of claim 7, wherein each bushing is fixedly mounted to the two valve body interfaces, the two valve body drain ports, and the tube inner walls at the two valve body water inlets by an interference fit.

13. An electric waterway switching valve, comprising: the waterway switching valve according to claim 1 or 7, a speed reducing motor unit, the speed reducing motor unit comprises a motor and a speed reducing box connected with the motor, an output shaft of the speed reducing box is connected with a transmission shaft of the valve core rotor to drive the valve core rotor to rotate around a central line X, and the waterway switching valve is characterized in that an automatic calibration sensor and a first position mark are respectively arranged on the outer surfaces of the first end part of the shell and the first end part of the rotor or the outer surfaces of a cover plate of the second end part of the shell and the second end part of the rotor, and an induction head of the automatic calibration sensor faces the inside of the valve body; when the valve core rotor rotates at a first rotation speed until the first position mark enters a preset induction range of the automatic calibration sensor, the automatic calibration sensor sends out a calibration signal.

14. The electrically operated waterway switching valve of claim 13, wherein the valve core rotor is in a backwash station or a filtration station when the first position mark and the auto-calibration sensor are aligned.

15. The electric waterway switching valve of claim 13, wherein a delay relay is electrically coupled to the auto-calibration sensor and the motor, the delay relay delays a preset calibration time after the auto-calibration sensor sends the calibration signal, during which the motor rotates the valve spool rotor at a second rotational speed lower than the first rotational speed until the valve spool rotor is rotated to the backwash station.

16. The electric waterway switching valve of claim 13, wherein the spool rotor is further provided with a second position mark, the second position mark and the first position mark being co-located at either the first end of the rotor or the second end of the rotor and spaced 180 degrees apart about the centerline X.

17. The electrically operated waterway switching valve of claim 13, wherein the auto-calibration sensor is a proximity sensor.

18. The electrically operated waterway switching valve of claim 13, wherein the first position is marked as a protrusion protruding from an outer surface of the first end of the rotor or an outer surface of the second end of the rotor.

19. The electrically operated waterway switching valve of claim 14, wherein a waterproof cover covers the sensing head of the self-calibrating sensor to isolate a space between the valve body and the spool rotor.

20. A method of calibrating an electrically operated waterway switching valve of claim 13, comprising the steps of:

After receiving the calibration signal, the control circuit controls the gear motor group to drive the valve core rotor to rotate slowly at a second rotating speed slower than the first rotating speed until the valve core rotor just rotates to the backwashing station or the filtering station;

And (2) after receiving the calibration signal, the control circuit controls the delay relay to start delaying for a preset calibration time, and in the preset calibration time of the delay relay, the speed reduction motor group drives the valve core rotor to rotate slowly at a second rotating speed slower than the first rotating speed until the valve core rotor just rotates to a backwashing station or a filtering station, and the delay is finished.

21. A backwash control method of an electric waterway switching valve according to claim 13, comprising the steps of:

(2.1) starting the speed reduction motor unit to drive the valve core rotor to rotate;

(2.2) when the valve core rotor rotates around the central line X to be within a certain angle range close to the backwashing station, performing backwashing station calibration until the valve core rotor is positioned on the backwashing station;

(2.3) the reduction motor group stalls;

(2.4) an external water inflow enters the rotor water inflow cavity, flows into a filter water outlet end from the other of the rotor water inflow end hole and the two valve body interfaces aligned with the rotor water inflow end hole and enters the filter interior, reversely washes the filter element, and a sewage water flows out of the filter water inlet end, enters the rotor water outflow cavity through one of the two valve body interfaces and the rotor water outlet end hole aligned with the rotor water inlet end hole and is discharged from the valve body;

(2.5) stopping external water inflow after a preset backwashing time is passed;

The water inlet of the valve body is connected with an output pipe of a water pump.

22. A filtration control method of the electric waterway switching valve of claim 13, comprising the steps of:

(3.1) starting the speed reduction motor unit on a backwashing station to drive the valve core rotor to rotate;

(3.2) the spool rotor rotates 180 degrees about a centerline X relative to the valve body;

(3.3) the gear motor group stalls;

(3.4) the external water inflow enters the rotor water inflow cavity, flows into the filter from one of the rotor water inflow end hole and the two valve body interfaces aligned with the rotor water inflow end hole, enters the filter interior, is filtered by the filter element, flows out of the filter water outflow end, enters the rotor water outflow cavity through the other of the two valve body interfaces and the rotor water outflow end hole aligned with the rotor water inflow end hole, and is discharged from the valve body;

(3.5) stopping the external inflow water flow after the preset filtering time.