CN112253813B - Device for automatically preventing fluid from flowing back - Google Patents
Device for automatically preventing fluid from flowing back Download PDFInfo
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- CN112253813B CN112253813B CN202011175783.9A CN202011175783A CN112253813B CN 112253813 B CN112253813 B CN 112253813B CN 202011175783 A CN202011175783 A CN 202011175783A CN 112253813 B CN112253813 B CN 112253813B
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- clack
- valve clack
- water inlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a device for automatically preventing fluid from flowing back, which comprises a valve body, wherein a valve chamber with a cylindrical cavity is arranged in the valve body, a plurality of communicating holes are formed in the outer side wall of the top of the valve chamber, a water inlet is formed in the side wall of the valve chamber, a water outlet is formed in the bottom of the valve chamber in an opening manner, the water outlet is connected with a conveying pipeline, and an impeller assembly used for forming a low-pressure area at the water outlet is also arranged in the valve chamber; vertical sliding fit has the valve clack in the valve chamber, the valve clack includes the valve plate, is located the water conservancy diversion platform of valve plate bottom and installs the breakwater in water conservancy diversion platform below, still be equipped with in the valve chamber and be used for restricting gliding upper limit mechanism of valve clack and lower limit mechanism, the buoyancy that receives of valve clack is greater than its gravity. The invention has simple structure, can automatically adjust the opening and closing of the valve when the fluid in the device flows in the forward direction and the reverse direction, and effectively avoids the phenomenon of a large amount of backflow of the valve body.
Description
Technical Field
The invention relates to the technical field of pumps, in particular to a device for automatically preventing fluid from flowing back.
Background
In general, in order to prevent mechanical failure caused by the reverse rotation of an impeller in a pump driven by the backflow of fluid in the pump after the operation of the pump is stopped, a check valve is generally installed at an outlet of the pump to stabilize outlet pressure and prevent the backflow. The spring of spring check valve adopts the spring steel to make, and the spring steel is when dealing with high temperature medium or strong acid medium transport, and the easy corruption damage, the life-span of check valve is very short, influences the normal work of pump. Conventional valves typically have hinge-like rotating mechanisms that are also highly susceptible to damage and failure in the presence of high temperature, high pressure, and corrosive media.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the device for automatically preventing the fluid from flowing back is simple in structure, can be suitable for conveying special media, can automatically adjust the opening and closing of the valve when the fluid in the pump flows in the forward direction and the reverse direction, and effectively avoids the phenomenon that a large amount of backflow occurs in the valve body.
In order to solve the technical problems, the invention adopts the following technical scheme:
the device for automatically preventing the backflow of the fluid comprises a valve body, wherein a valve chamber with a cylindrical cavity is arranged in the valve body, a plurality of communication holes are formed in the outer side wall of the top of the valve chamber, a water inlet is formed in the side wall of the valve chamber, a water outlet is formed in the bottom of the valve chamber in an open mode, a conveying pipeline is connected to the water outlet, and an impeller assembly used for forming a low-pressure area at the water outlet is further arranged in the valve chamber; the valve chamber is vertically matched with a valve clack in a sliding manner, the valve clack comprises a valve plate, a flow guide platform positioned at the bottom of the valve plate and a water baffle plate arranged below the flow guide platform, the flow guide platform is used for rectifying fluid flowing into a water inlet into fluid towards a water outlet direction, the water baffle plate can seal the water inlet under the sliding action of the valve clack, an upper limiting mechanism and a lower limiting mechanism for limiting the sliding of the valve clack are further arranged in the valve chamber, and when the valve clack slides upwards to the upper limiting mechanism, the water inlet is sealed by the water baffle plate of the valve clack; when the valve clack slides downwards to the lower limiting mechanism, the flow guide platform of the valve clack is opposite to the water inlet, and the water baffle is positioned below the water inlet; the valve clack is subjected to buoyancy greater than the gravity thereof.
In the invention, the device is placed in a container to be conveyed with fluid, the fluid level in the container is higher than the communicating hole of the valve chamber through the arrangement of the communicating hole on the outer side wall of the top of the valve chamber, the fluid enters the valve chamber through the communicating hole, and the pressure equalization between the upper part of a valve clack in the valve chamber and the external fluid can be realized, so the valve clack can be subjected to buoyancy, and the gravity and the borne buoyancy of the valve clack are fixed values, and the gravity of the valve clack is slightly smaller than the buoyancy borne by the valve clack. The water inlet is opened and closed by switching the diversion platform and the water baffle on the valve clack back and forth with the water inlet. Specifically, when the impeller assembly in the valve chamber is in a closed state, the buoyancy borne by the valve clack is greater than gravity, so that the valve clack is in a high position under the action of the limiting assembly, the water baffle plate at the lowest part of the valve clack is opposite to the water inlet to completely seal the water inlet, and the water inlet is in a closed state. When the impeller assembly in the valve chamber works, the impeller assembly generates a low-pressure area at the water outlet, the water pressure above the valve clack is greater than the water pressure below the valve clack, therefore, when the gravity and the up-down pressure difference borne by the valve clack are greater than the buoyancy borne by the valve clack, the valve clack slides downwards, the water baffle is staggered with the water inlet, the flow guide platform above the water baffle is communicated with the water inlet, the water inlet is in an automatic opening state, the valve clack can also move downwards due to the impact force of fluid entering the valve body from the water inlet on the flow guide platform, then the valve clack moves to the lowest position under the action of the limiting assembly, and the water inlet is in a completely opening state. When the power assembly in the valve chamber is closed and backflow fluid exists in the valve body, the backflow fluid can impact the valve clack to move upwards, and the valve clack moves upwards at a high position until the water inlet is sealed by the water baffle plate because the buoyancy of the valve clack is larger than the gravity of the valve clack, so that the water inlet is automatically in a closed state.
In the scheme, when the impeller assembly works, the water inlet is automatically opened under the driving of fluid, and when backflow movement occurs, backflow is limited and completely prevented, so that the automatic closing of the water inlet is realized. The valve clack is wholly positioned in fluid in the valve chamber, buoyancy and gravity borne by the valve clack are utilized, power for upward movement of the valve clack is provided through buoyancy, the water inlet is automatically closed through the water baffle, a special power mechanism is needed to close the valve without a conventional spring check valve or a hinge type valve, and the conventional valve is positioned in the fluid, particularly special fluid, such as high-temperature molten iron or corrosive fluid, and the conventional valve body is easy to lose efficacy and cannot normally work. The device is not provided with a spring, a hinge and other control mechanisms which need to be controlled electrically, can be suitable for conveying special media, can realize automatic opening and closing of the valve by utilizing buoyancy and gravity borne by the valve clack, does not need manual control, and is very simple to operate. And this device simple structure, impeller subassembly also are located the valve body, and for the valve body with the impeller pump body closes as an organic whole, integrate higher.
Preferably, the impeller assembly comprises a vertical main shaft arranged on the valve clack in a penetrating mode and an impeller arranged at the lower end of the main shaft, a through hole for the main shaft to penetrate through is formed in the center of the valve clack, a gap is formed between the main shaft and the through hole of the valve clack, the upper end of the main shaft extends out of the valve body and is connected with a motor, and the impeller is arranged at the lower end of the main shaft and located at the water outlet.
Like this, the motor is installed at the top of valve body, and the top of valve body is located the liquid level top, rotates through motor drive main shaft to drive the impeller and rotate and form the low-pressure zone in delivery port department, because of the valve clack hydraulic pressure difference from top to bottom, the valve clack downstream lets the water conservancy diversion platform opposite with the water inlet, makes the water inlet be in the open mode. Main shaft, motor and impeller in this scheme close as an organic wholely with the valve body, have formed the integral type structure of valve and the pump body, shared small. And because the clearance is arranged between the main shaft and the through hole of the valve clack and is very small, when the valve body works, the valve clack cannot generate a larger vortex in the valve body, and the phenomenon that the impeller is sucked to be empty is avoided.
Preferably, the number of the water inlets of the valve chamber is four, and the water inlets are uniformly distributed along the circumferential direction of the outer wall of the valve chamber and are positioned at the same height.
Like this, can satisfy the biggest suction capacity of impeller through setting up four water inlets, the problem that the inflow is not enough can not appear, four water inlet evenly distributed moreover, just right two water inlet inflow's fluid can have the effect of offsetting each other to the impact force that the valve body produced, and the fluid is just littleer to the impact force of water conservancy diversion platform like this, has correspondingly reduced the vibration of valve body and impeller subassembly at the during operation, and stability is higher.
As optimization, the water conservancy diversion platform is formed by the circumference of the bottom of the valve clack being set to be streamlined and inwards concave towards the center direction, and the longitudinal section of the water conservancy diversion platform is two quarter circular arcs, and the water conservancy diversion platform and the valve plate are integrally formed.
Therefore, when the diversion table is opposite to the water inlet, a fluid conveying channel is formed, the fluid entering the valve body from the water inlet along the horizontal direction is rectified into vertically downward fluid, the outer surface of the diversion table is in streamline distribution, the resistance to the fluid is extremely low, the flow direction of the fluid in the valve body is very uniform, the energy consumption of the impeller in pumping is reduced, and the energy-saving effect is achieved.
Preferably, the water baffle is cylindrical and vertically arranged, the water baffle is installed at the bottom of the flow guide table through a connecting piece, and the outer wall of the water baffle is in contact with the inner wall of the valve chamber.
Thus, the four water inlets of the valve chamber are arranged, the valve clacks can generate local rotation in the valve chamber due to the impact of fluid, the water baffle is set to be cylindrical, even if the valve clacks slightly rotate, the water baffle and the water inlets cannot be staggered, and when the water inlets need to be closed, the water baffle can always play a role in sealing the water inlets.
Preferably, the connecting piece comprises four connecting plates distributed in a cross shape along the center of the valve clack, the cross section of each connecting plate is L-shaped, the connecting piece is fixedly connected with the corresponding position of the bottom of the flow guide table through the vertical part corresponding to the connecting plate, and the horizontal part of the connecting piece is fixedly connected with the corresponding position of the bottom of the water baffle.
Therefore, the water baffle is connected with the flow guide table through the connecting piece, the four connecting plates are distributed in a cross shape, gaps between the adjacent connecting plates form a water passing channel for fluid to pass through, and smooth passing of fluid in the valve body is guaranteed. And through the crisscross connecting piece, the water baffle is installed and is had higher stability on the water conservancy diversion platform, can play sufficient impact resistance to the water pressure of water inlet department, has guaranteed the ability of closing water of valve body.
Preferably, the valve body comprises a cylindrical valve body with two open ends and a valve cover covering the top of the valve body, and the valve cover is fixedly connected with the valve body through a fastening piece; the valve plate is fixed with a control rod which extends upwards, the valve cover is correspondingly provided with a limiting hole for the control rod to pass through, the upper end of the control rod passes through the limiting hole and extends out of the valve cover, and a marking line used for marking the opening and closing state of the valve body is carved on the peripheral wall of the control rod extending out of the outer part of the valve cover.
Like this, through the valve gap that sets up on the valve body, the valve gap is opened and can be conveniently overhauld and change the internal component of valve body. Through the control rod that sets up on the valve clack, behind the spacing hole of control rod passing valve gap, under the effect in spacing hole, the gag lever post can only the up-and-down motion, avoids the valve clack to take place local rotation in the valve chamber, and the slip process of valve clack is more stable. Under the general condition, the valve body is located below the liquid level, and the valve cover is located above the liquid level, so the control rod extends out of the marking line carved on the valve cover part, the opening degree and the opening and closing conditions of the water inlet of the valve body can be observed, and the valve body is monitored in real time.
Preferably, the lower limiting mechanism is an annular boss arranged on the inner wall of the valve chamber, an annular groove matched with the annular boss is correspondingly arranged on the outer end face of the valve plate, the annular boss is positioned above the water inlet, when the valve clack slides downwards until the groove of the valve clack is abutted against the boss, the flow guide table of the valve clack is opposite to the water inlet, and the water baffle is positioned below the water inlet; the upper limiting mechanism is a limiting shaft shoulder sleeved on the control rod, the outer diameter of the limiting shaft shoulder is larger than the aperture of a limiting hole in the valve cover, and when the valve clack slides upwards to the limiting shaft shoulder on the control rod to abut against the valve cover, the water inlet is sealed by the water baffle of the valve clack.
Therefore, the upper and lower strokes of the valve clack in the valve chamber are limited by the annular boss and the limiting shaft shoulder which are arranged in the valve chamber, and when the valve clack slides upwards to the upper limiting mechanism, the water baffle of the valve clack seals the water inlet; when the valve clack slides downwards to the lower limiting mechanism, the flow guide platform of the valve clack is opposite to the water inlet, and the water baffle is positioned below the water inlet. The problem that the opening and closing of the water inlet of the valve body are invalid due to the fact that the sliding position of the valve clack is not limited is solved.
Preferably, the top of the valve plate is provided with a counterweight groove for placing a counterweight block, and the counterweight block is placed in the counterweight groove to increase the weight of the valve clack.
Thus, the density of different media is different due to different transport media, and the buoyancy force of the natural valve clack in different media is different. Therefore, in order to keep the buoyancy of the valve flap slightly larger than the gravity borne by the valve flap all the time, but the difference between the buoyancy of the valve flap and the gravity cannot be greatly different, because the motor has fixed output power, if the difference between the buoyancy of the valve flap and the gravity borne by the valve flap is too large, the water inlet cannot be quickly opened, and the phenomenon that the motor is damaged due to the fact that the impeller is sucked to be empty easily occurs. Therefore, the counterweight blocks are increased or decreased on the valve clack, so that when the valve clack is positioned in a corresponding medium, the difference between buoyancy and gravity borne by the valve clack is within an allowable range, the backflow amount is dynamically limited, and the throttling and flow breaking effects on backflow are realized.
In conclusion, the beneficial effects of the invention are as follows: according to the invention, buoyancy and gravity borne by the valve flap are utilized, power for the valve flap to move upwards is provided through buoyancy, the water inlet is automatically closed through the water baffle, a specific power mechanism is required to close the valve without the need of a conventional spring check valve or a hinge type valve, and the conventional valve is positioned in a fluid, especially a special fluid such as high-temperature molten iron or a corrosive fluid, and the conventional valve body is easy to lose efficacy and cannot normally work. The device is not provided with a spring, a hinge and other control mechanisms which need to be controlled electrically, can be suitable for conveying special media, can realize automatic opening and closing of the valve by utilizing buoyancy and gravity borne by the valve clack, does not need manual control, and is very simple to operate. And this device simple structure, impeller subassembly also are located the valve body, and for the valve body with the impeller pump body closes as an organic whole, integrate higher.
Drawings
For a better understanding of the objects, solutions and advantages of the present invention, reference will now be made in detail to the present invention, which is illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of A-A in FIG. 1;
FIG. 3 is a schematic view of the valve flap of FIG. 1;
FIG. 4 is a schematic view of B-B in FIG. 3;
FIG. 5 is a schematic view of the reflux state of the apparatus;
fig. 6 is a schematic view of the closed state of the device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Reference numerals in the drawings of the specification include: the valve comprises a valve body 1, a water inlet 2, a water outlet 3, a valve clack 4, a main shaft 5, a valve plate 6, a flow guide platform 7, a water baffle 8, a connecting piece 9, a valve cover 10, a control rod 11, a limiting shaft shoulder 12, an annular groove 13, a counterweight groove 14, a liquid level 15, a nut 16 and a limiting frame 17.
In this embodiment, as shown in fig. 1 to 6, the device for automatically preventing fluid from flowing back includes a valve body 1, a valve chamber having a cylindrical cavity is provided in the valve body 1, a plurality of communication holes are provided on an outer side wall of a top of the valve chamber, a water inlet 2 is provided on a side wall of the valve chamber, a water outlet 3 is formed on a bottom of the valve chamber in an open manner, the water outlet 3 is connected with a delivery pipe, and an impeller assembly for forming a low-pressure region at the water outlet 3 is further provided in the valve chamber; the valve chamber is vertically matched with a valve flap 4 in a sliding manner, the valve flap 4 comprises a valve plate 6, a flow guide table 7 positioned at the bottom of the valve plate 6 and a water baffle 8 arranged below the flow guide table 7, the flow guide table 7 is used for rectifying fluid flowing into the water inlet 2 into fluid towards the direction of the water outlet 3, the water baffle 8 can seal the water inlet 2 under the sliding action of the valve flap 4, an upper limiting mechanism and a lower limiting mechanism for limiting the sliding of the valve flap are further arranged in the valve chamber, and when the valve flap 4 slides upwards to the upper limiting mechanism, the water baffle 8 of the valve flap 4 seals the water inlet 2; when the valve clack 4 slides downwards to the lower limiting mechanism, the flow guide platform 7 of the valve clack 4 is opposite to the water inlet 2, and the water baffle 8 is positioned below the water inlet 2; the valve flap 4 is subjected to a buoyancy force greater than its gravity.
In the invention, the device is placed in a container for fluid to be conveyed, the device is placed in the container for fluid to be conveyed, through the arrangement of the communicating hole on the outer side wall of the top of the valve chamber, the liquid level of the fluid in the container is higher than the communicating hole of the valve chamber, the fluid enters the valve chamber through the communicating hole, the pressure equalization can be realized between the upper part of the valve flap 4 in the valve chamber and the external fluid, the valve flap 4 can be subjected to buoyancy, and the gravity and the buoyancy of the valve flap 4 are fixed values, so that the gravity of the valve flap 4 is slightly smaller than the buoyancy of the valve flap 4. Therefore, the water inlet 2 is opened and closed by switching the diversion platform 7 and the water baffle 8 on the valve clack 4 back and forth with the water inlet 2. Specifically, when the impeller assembly in the valve chamber is in a closed state, the buoyancy borne by the valve clack 4 is greater than gravity, so that the valve clack 4 is in a high position under the action of the limiting assembly, the water baffle 8 at the lowest part of the valve clack 4 is opposite to the water inlet 2, the water inlet 2 is completely sealed, and the water inlet 2 is in a closed state. When the impeller assembly in the valve chamber works, the impeller assembly generates a low-pressure area at the water outlet 3, the water pressure above the valve clack 4 is greater than the water pressure below the valve clack 4, therefore, the gravity and the up-down pressure difference of the valve clack 4 are greater than the buoyancy force of the valve clack 4, the valve clack 4 slides downwards, the water baffle 8 is staggered with the water inlet 2, the diversion table 7 above the water baffle 8 is communicated with the water inlet 2, the water inlet 2 is in an automatic opening state, and the valve clack 4 can also move downwards due to the impact force of fluid entering the valve body from the water inlet 2 on the diversion table 7, then the valve clack 4 moves to the lowest position under the action of the limiting assembly, and the water inlet 2 is in a completely opening state. When the power assembly in the valve chamber is closed, and backflow fluid exists in the valve body, the backflow fluid can impact the valve clack 4 to move upwards, and the valve clack 4 moves upwards at a high position until the water baffle 8 seals the water inlet 2 because the buoyancy of the valve clack 4 is larger than the gravity of the valve clack 4, and the water inlet 2 is automatically in a closed state.
In the scheme, when the impeller assembly works, the water inlet 2 is automatically opened under the driving of fluid, and when backflow movement occurs, backflow is limited and completely prevented, so that the water inlet 2 is automatically closed. The valve clack 4 is wholly positioned in the valve chamber in a fluid, buoyancy and gravity borne by the valve clack 4 are utilized, power for upward movement of the valve clack 4 is provided through the buoyancy, the water inlet 2 is automatically closed through the water baffle 8, a special power mechanism is needed for closing the valve without a conventional spring check valve or a hinge type valve, and the conventional valve is positioned in the fluid, particularly in a special fluid such as high-temperature molten iron or corrosive fluid, and the conventional valve body is easy to lose efficacy and cannot normally work. The device is not provided with a spring, a hinge and other control mechanisms which need to be controlled electrically, can be suitable for conveying special media, can realize automatic opening and closing of the valve by utilizing buoyancy and gravity borne by the valve clack 4, does not need manual control, and is very simple to operate. And this device simple structure, impeller subassembly also are located the valve body, and for the valve body with the impeller pump body closes as an organic whole, integrate higher.
In a specific embodiment, the impeller assembly comprises a vertical main shaft 5 penetrating through the valve flap 4 and an impeller installed at the lower end of the main shaft 5, a through hole for the main shaft 5 to pass through is formed in the center of the valve flap 4, a gap is formed between the main shaft 5 and the through hole of the valve flap 4, the upper end of the main shaft 5 extends out of the valve body and is connected with a motor, and the impeller is installed at the lower end of the main shaft 5 and is located at the water outlet 3.
Like this, the motor is installed at the top of valve body, and the top of valve body is located the liquid level top, rotates through motor drive main shaft 5 to drive the impeller and rotate and form the low-pressure zone in delivery port 3 department, because of valve clack 4 hydraulic pressure difference from top to bottom, valve clack 4 downstream lets water conservancy diversion platform 7 relative with water inlet 2, makes water inlet 2 be in the open mode. Main shaft 5, motor and impeller in this scheme close as an organic wholely with the valve body, have formed the integral type structure of valve and the pump body, shared small.
In the specific embodiment, the number of the water inlets 2 of the valve chamber is four, and the water inlets are uniformly distributed along the circumferential direction of the outer wall of the valve chamber and are positioned at the same height.
Like this, can satisfy the biggest suction capacity of impeller through setting up four water inlets 2, the problem that the inflow is not enough can not appear, four water inlets 2 evenly distributed moreover, just right two 2 fluid that flow in of water inlet have the effect of offsetting each other to the impact force that the valve body produced, the impact force of fluid to water conservancy diversion platform 7 just so is littleer, has correspondingly reduced the vibration of valve body and impeller subassembly at the during operation, and stability is higher.
In the specific embodiment, the water conservancy diversion platform 7 is formed by the circumference of the bottom of the valve clack 4 being set to be streamlined and inwards concave towards the center direction, and the longitudinal section of the water conservancy diversion platform 7 is in the shape of two quarter circular arcs, and the water conservancy diversion platform 7 and the valve plate 6 are integrally formed.
Therefore, when the guide table 7 is opposite to the water inlet 2, a fluid conveying channel is formed, fluid entering the valve body from the water inlet 2 along the horizontal direction is rectified into vertically downward fluid, the outer surface of the guide table 7 is in streamline distribution, resistance to the fluid is extremely low, the flow direction of the fluid in the valve body is very uniform, energy consumption of the impeller in pumping is reduced, and the energy-saving effect is achieved.
In the specific embodiment, the water baffle 8 is cylindrical and vertically arranged, the water baffle 8 is installed at the bottom of the diversion platform 7 through a connecting piece 9, and the outer wall of the water baffle 8 is in contact with the inner wall of the valve chamber.
Thus, because the four water inlets 2 of the valve chamber are arranged, the valve clack 4 can generate local rotation in the valve chamber due to the impact of fluid, the water baffle 8 is set to be cylindrical, even if the valve clack 4 slightly rotates, the water baffle 8 and the water inlets 2 cannot be staggered, and when the water inlets 2 need to be closed, the water baffle 8 can always play a role in closing the water inlets 2.
In a specific embodiment, the connecting member 9 includes four connecting plates distributed in a cross shape along the center of the valve flap 4, each connecting plate has an L-shaped cross section, the connecting member 9 is fixedly connected with a corresponding position at the bottom of the diversion table 7 through a vertical portion of the corresponding connecting plate, and a horizontal portion of the connecting member is fixedly connected with a corresponding position at the bottom of the water baffle 8.
Thus, the water baffle 8 is connected with the flow guide table 7 through the connecting piece 9, the four connecting plates are distributed in a cross shape, gaps between the adjacent connecting plates form a water passing channel for fluid to pass through, and smooth passing of the fluid in the valve body is guaranteed. And through cross connecting piece 9, the stability that breakwater 8 was installed on water conservancy diversion platform 7 is higher, can play sufficient impact resistance to the water pressure of water inlet 2 department, has guaranteed the ability of closing water of valve body 1.
In a specific embodiment, the valve body 1 comprises a cylindrical valve body with two open ends and a valve cover 10 covering the top of the valve body, and the valve cover 10 is fixedly connected with the valve body through a fastener; the valve plate 6 is fixed with a control rod 11 which extends upwards, the valve cover 10 is correspondingly provided with a limiting hole through which the control rod 11 passes, the upper end of the control rod 11 passes through the limiting hole and extends out of the valve cover 10, and a marking line used for marking the opening and closing state of the valve body is carved on the peripheral wall of the outer part of the control rod 11 extending out of the valve cover 10.
Like this, through the valve gap 10 that sets up on the valve body, the valve gap 10 is opened and can be conveniently overhauld and change the internal component of valve body. Through the control rod 11 arranged on the valve clack 4, after the control rod 11 passes through the limiting hole of the valve cover 10, the limiting rod can only move up and down under the action of the limiting hole, so that the valve clack 4 is prevented from locally rotating in the valve chamber, and the sliding process of the valve clack 4 is more stable. Normally, the valve body is located below the liquid level, and the valve cover 10 is located above the liquid level, so that the control rod 11 extends out of the marked line carved on the valve cover 10, and can be used for observing the opening and closing conditions of the water inlet 2 of the valve body 1, and playing a real-time monitoring role on the valve body 1.
In a specific embodiment, the lower limiting mechanism is an annular boss arranged on the inner wall of the valve chamber, an annular groove 13 matched with the annular boss is correspondingly arranged on the outer end face of the valve plate, the annular boss is positioned above the water inlet, when the valve flap slides downwards until the groove of the valve flap is abutted against the boss, the flow guide platform of the valve flap 4 is opposite to the water inlet, and the water baffle is positioned below the water inlet; the upper limiting mechanism is a limiting shaft shoulder 12 sleeved on the control rod 11, the outer diameter of the limiting shaft shoulder is larger than the aperture of an upper limiting hole of the valve cover 10, and when the valve clack slides upwards to the limiting shaft shoulder on the control rod to be abutted against the valve cover 10, the water baffle 8 of the valve clack 4 seals the water inlet 2.
Thus, the up-and-down stroke of the valve clack in the valve chamber is limited by the annular boss and the limiting shaft shoulder 12 arranged in the valve chamber, and when the valve clack slides upwards to the upper limiting mechanism, the water baffle of the valve clack seals the water inlet; when the valve clack slides downwards to the lower limiting mechanism, the flow guide platform of the valve clack is opposite to the water inlet, and the water baffle is positioned below the water inlet. The problem that the opening and closing of the water inlet of the valve body are invalid due to the fact that the sliding position of the valve clack is not limited is solved.
In a specific embodiment, the top of the valve plate 6 is opened with a weight groove 14 for placing a weight block, and the weight block is placed in the weight groove 14 to increase the weight of the valve flap 4.
Thus, the density of different media is different due to different transport media, and the buoyancy force of the natural valve flap 4 in different media is different. Therefore, in order to always keep the buoyancy of the valve flap 4 slightly larger than the gravity borne by the valve flap, but the difference between the buoyancy of the valve flap 4 and the gravity cannot be greatly different, because the motor has fixed output power, if the difference between the buoyancy of the valve flap 4 and the gravity borne by the valve flap is too large, the water inlet 2 cannot be quickly opened, and the phenomenon that the motor is damaged due to the fact that the impeller is sucked to be empty easily occurs. Therefore, the counterweight blocks are increased or decreased on the counterweight grooves 14 on the valve clack 4, so that when the valve clack 4 is positioned in a corresponding medium, the difference between the buoyancy and the gravity borne by the valve clack 4 is in an allowable range, the backflow amount is dynamically limited, and the throttling and flow-breaking effects on backflow are realized.
In the specific implementation process, still install detachable manual regulation structure on the valve gap 10, manual regulation mechanism includes nut 16 and spacing 17, spacing 17 detachable installs on valve gap 10, nut 16 and the 11 screw-thread fit of control lever, spacing 17 is passed on the top of control lever 11, and nut 16 is located between valve gap 10 and the spacing 17, and spacing can carry on spacingly to the nut. The control rod is lifted up and down by rotating the nut to drive the valve clack to move up and down, so that the opening and closing of the water inlet are adjusted. When the manual adjusting function needs to be closed, the limiting frame 17 is disassembled, and the nut on the control rod is removed.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An automatic fluid backflow prevention device, comprising a valve body having a valve chamber with a cylindrical cavity therein, characterized in that: the outer side wall of the top of the valve chamber is provided with a plurality of communicating holes, the side wall of the valve chamber is provided with a water inlet, the bottom of the valve chamber is opened to form a water outlet, the water outlet is connected with a conveying pipeline, and an impeller assembly used for forming a low-pressure area at the water outlet is further arranged in the valve chamber; the valve chamber is vertically matched with a valve clack in a sliding manner, the valve clack comprises a valve plate, a flow guide platform positioned at the bottom of the valve plate and a water baffle plate arranged below the flow guide platform, the flow guide platform is used for rectifying fluid flowing into a water inlet into fluid towards a water outlet direction, the water baffle plate can seal the water inlet under the sliding action of the valve clack, an upper limiting mechanism and a lower limiting mechanism for limiting the sliding of the valve clack are further arranged in the valve chamber, and when the valve clack slides upwards to the upper limiting mechanism, the water inlet is sealed by the water baffle plate of the valve clack; when the valve clack slides downwards to the lower limiting mechanism, the flow guide platform of the valve clack is opposite to the water inlet, and the water baffle is positioned below the water inlet; the valve clack is subjected to buoyancy greater than the gravity thereof.
2. The apparatus for automatically preventing backflow of fluid according to claim 1, wherein: the impeller assembly comprises a vertical main shaft arranged on the valve clack in a penetrating mode and an impeller arranged at the lower end of the main shaft, a through hole for the main shaft to penetrate through is formed in the center of the valve clack, a gap is formed between the main shaft and the through hole of the valve clack, the upper end of the main shaft extends out of the valve body and is connected with a motor, and the impeller is arranged at the lower end of the main shaft and is located at a water outlet.
3. The apparatus for automatically preventing backflow of fluid according to claim 1, wherein: the water inlets of the valve chamber are four in number, are uniformly distributed along the circumferential direction of the outer wall of the valve chamber and are positioned at the same height.
4. The apparatus for automatically preventing backflow of fluid according to claim 3, wherein: the water conservancy diversion platform is formed by the circumference of the bottom of the valve clack being arranged in a streamline shape and inwards concave towards the center direction, the longitudinal section of the water conservancy diversion platform is in the shape of two quarter arcs, and the water conservancy diversion platform and the valve plate are integrally formed.
5. The apparatus for automatically preventing backflow of fluid according to claim 4, wherein: the water baffle is cylindrical and vertically arranged, the water baffle is installed at the bottom of the flow guide table through a connecting piece, and the outer wall of the water baffle is in contact with the inner wall of the valve chamber.
6. The apparatus for automatically preventing backflow of fluid according to claim 5, wherein: the connecting piece includes four connecting plates that are the cross distribution along the center of valve clack, and the cross section of every connecting plate is the L type, the connecting piece is through the vertical portion that corresponds the connecting plate and the corresponding position fixed connection of water conservancy diversion platform bottom, and its horizontal part and the corresponding position fixed connection of breakwater bottom.
7. The apparatus for automatically preventing backflow of fluid according to claim 1, wherein: the valve body comprises a cylindrical valve body with two open ends and a valve cover covering the top of the valve body, and the valve cover is fixedly connected with the valve body through a fastening piece; the valve plate is fixed with a control rod which extends upwards, the valve cover is correspondingly provided with a limiting hole for the control rod to pass through, the upper end of the control rod passes through the limiting hole and extends out of the valve cover, and a marking line used for marking the opening and closing state of the valve body is carved on the peripheral wall of the control rod extending out of the outer part of the valve cover.
8. The apparatus for automatically preventing backflow of fluid according to claim 7, wherein: the lower limiting mechanism is an annular boss arranged on the inner wall of the valve chamber, an annular groove matched with the annular boss is correspondingly arranged on the outer end face of the valve plate, the annular boss is positioned above the water inlet, when the valve clack slides downwards until the groove of the valve clack is abutted against the boss, the flow guide platform of the valve clack is opposite to the water inlet, and the water baffle is positioned below the water inlet; the upper limiting mechanism is a limiting shaft shoulder sleeved on the control rod, the outer diameter of the limiting shaft shoulder is larger than the aperture of a limiting hole in the valve cover, and when the valve clack slides upwards to the limiting shaft shoulder on the control rod to abut against the valve cover, the water inlet is sealed by the water baffle of the valve clack.
9. The apparatus for automatically preventing backflow of fluid according to claim 1, wherein: the top of the valve plate is provided with a counterweight groove for placing a counterweight block, and the counterweight block is placed in the counterweight groove to increase the weight of the valve clack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011175783.9A CN112253813B (en) | 2020-10-28 | 2020-10-28 | Device for automatically preventing fluid from flowing back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011175783.9A CN112253813B (en) | 2020-10-28 | 2020-10-28 | Device for automatically preventing fluid from flowing back |
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| CN112253813A CN112253813A (en) | 2021-01-22 |
| CN112253813B true CN112253813B (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011175783.9A Active CN112253813B (en) | 2020-10-28 | 2020-10-28 | Device for automatically preventing fluid from flowing back |
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| CN2221139Y (en) * | 1995-03-17 | 1996-02-28 | 张志中 | Water pump automatic intake and exhaust valve |
| CN1687624A (en) * | 2005-04-14 | 2005-10-26 | 重庆水泵厂有限责任公司 | Revolving flutter valve group and application in pump and pipe line thereof |
| CN101156009A (en) * | 2005-04-12 | 2008-04-02 | 艾安·德拉库普·多伊格 | Improvements in valves and pumps |
| CN201428837Y (en) * | 2009-04-17 | 2010-03-24 | 高密市海纳卫浴制品有限公司 | Check valve |
| JP2012177478A (en) * | 2012-04-27 | 2012-09-13 | Torishima Pump Mfg Co Ltd | Safety valve |
| CN210510400U (en) * | 2019-08-15 | 2020-05-12 | 江苏永一泵业科技集团有限公司 | Buoyancy type check valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6692234B2 (en) * | 1999-03-22 | 2004-02-17 | Water Management Systems | Pump system with vacuum source |
| US10844965B2 (en) * | 2018-10-22 | 2020-11-24 | Mueller International, Llc | Anti-shock check valve |
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2020
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2221139Y (en) * | 1995-03-17 | 1996-02-28 | 张志中 | Water pump automatic intake and exhaust valve |
| CN101156009A (en) * | 2005-04-12 | 2008-04-02 | 艾安·德拉库普·多伊格 | Improvements in valves and pumps |
| CN1687624A (en) * | 2005-04-14 | 2005-10-26 | 重庆水泵厂有限责任公司 | Revolving flutter valve group and application in pump and pipe line thereof |
| CN201428837Y (en) * | 2009-04-17 | 2010-03-24 | 高密市海纳卫浴制品有限公司 | Check valve |
| JP2012177478A (en) * | 2012-04-27 | 2012-09-13 | Torishima Pump Mfg Co Ltd | Safety valve |
| CN210510400U (en) * | 2019-08-15 | 2020-05-12 | 江苏永一泵业科技集团有限公司 | Buoyancy type check valve |
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| CN112253813A (en) | 2021-01-22 |
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