CN212389758U - High-precision water level control float valve - Google Patents

Abstract

The utility model provides a high accuracy water level control ball-cock assembly, a serial communication port, including disk seat and floater, the disk seat is provided with the intake antrum of central coincidence, lock the water cavity and be located valve block between the two, the central point of intake antrum puts and has seted up the water inlet runner, the cross-sectional area of water inlet runner is less than the cross-sectional area of lock the water cavity, the central point of lock the water cavity puts and has seted up the outlet, the central point of valve block puts and is provided with water structure, make the water that has certain pressure in the water inlet runner can enter the lock water cavity through water structure, the floater is worn to locate on the disk seat through the piston rod of a axle center and the central point of valve block coincidence, the piston rod can follow the closed outlet in the outside of. The utility model provides a floating ball valve just can open the outlet at the minimum distance of floater decline to intercommunication water inlet channel realizes intaking, is applicable to the in service behavior of steam boiler more traditional floating ball valve structure, can not appear intaking untimely the condition of taking place dry combustion method often, and the practicality is strong.

Description

High-precision water level control float valve

Technical Field

The utility model relates to a steam boiler technical field, a high accuracy precision water level control ball-cock assembly suitable for supply of intaking of circulating steam boiler very much.

Background

The steam boiler refers to a heat energy conversion device for producing steam, and water must be supplemented to the boiler in real time according to needs in the process of producing steam so as to avoid the damage to the boiler caused by water shortage and dry burning in the boiler. The circulating steam boiler is also called a drum boiler, and the drum generally has two functions, namely steam-water separation and water supply. The steam pocket is internally provided with a high-low water level detector which controls the water supply through the high-low water level. The intermittent water replenishing mode has the following disadvantages: 1. the water temperature of the boiler can fluctuate periodically, and the steam temperature can fluctuate along with the water temperature; 2. whether the performance of the high-low water level electric control system is stable or not directly influences the reliability of water replenishing of the boiler; 3. in order to avoid frequent start-stop of the water supply pump, the water capacity of the boiler steam drum is large enough. The large-sized steam boiler also adopts a more expensive flow monitoring following system and an electric actuating mechanism to control the stability of water supply, for the medium-sized and small-sized circulating steam boilers, because the cost is limited, an excessively expensive water supply guarantee system cannot be adopted, and the intermittent water supply mode of high-low water level control becomes the conventional choice of the existing medium-sized and small-sized circulating steam boilers.

The existing precise water level control water supply device (patent number: CN101825905B) has the advantages of small volume, low cost, light structure, precise liquid level control and the like, is widely applied to products requiring precise water level control, such as instant water boiler real-time water supplement and the like, and is an excellent precise water level control component. However, the above water supply device for replenishing water to a circulating steam boiler has the following disadvantages: 1. the threaded connection mode of the upper cavity sleeve and the lower cavity sleeve, the connection mode of the water inlet pipe and the upper cavity sleeve, the silica gel material of the sealing rubber gasket and the planar structure of the upper plane can influence the accurate positioning of the opening of the valve, so the flow of water is not easy to control, the optimal working mode of the steam boiler is that the flow of water supply can be changed along with the flow of output steam in real time, and obviously, the device can not meet the requirement; 2. the pressure bearing capacity of the threaded connection mode of the upper cavity sleeve and the lower cavity sleeve is poor, the steam pressure is higher than 0.5Mpa, and threads are easy to damage; 3. the structural form of the sealing rubber cushion can not effectively lock water due to the pressure loss of the working cavity when the water pressure is low (below about 0.1 MP), can not effectively lock water due to the softer material of the sealing rubber cushion and the planar structure of the upper plane when the water pressure is high (above about 0.6 MP), the sealing rubber cushion is in a middle position when in a static state, the up-and-down motion is tensile deformation, particularly, the sealing rubber cushion works in a high-temperature state, the sealing rubber cushion is easy to plastically deform and lose efficacy, the upper plane of the center of the sealing rubber cushion moves up and down in a center hole of the metal gasket above the sealing rubber cushion, when the ball float valve is in the water locking state, the water pressure of the working cavity generates upward thrust to the sealing rubber cushion, the thrust is higher as the water pressure is higher, and the sealing rubber cushion is easy to damage due; therefore, the upper plane cannot operate for a long time under a water pressure of 0.5MPa or more; 4. the integrated design that the bottom cylinder is stretched out from the center of the bottom of the lower cavity sleeve has two defects: firstly, the processing difficulty is high, secondly, the processing precision of the bottom cylinder is not easy to guarantee, and because the requirement on the fit clearance between the bottom cylinder and the central hole of the upper plane is high, if the bottom cylinder is unqualified, the whole workpiece needs to be scrapped; 5. the design scheme that the pressure relief hole deviates from the center shaft has the problem that the positioning precision cannot be ensured by means of the vertical movement of a metal mounting arm (a low-precision sheet metal machined part), the floating ball deviates from the center shaft and moves in an arc manner, the transverse vibration is large under the working condition of frequent water level fluctuation, a moving mechanism is easy to damage, and the reliability is low, so that the precise water level control water supply device is not suitable for the water level control water supplement of a steam boiler with high water temperature and high water pressure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. For this, the utility model provides a high accuracy water level control ball-cock assembly, including disk seat and floater, the disk seat is provided with the intake antrum of center coincidence, locks the water cavity and is located valve block between the two, the intake antrum corresponds the central point of valve block puts and has seted up the runner of intaking, the cross-sectional area of intaking runner is less than the cross-sectional area of locking the water cavity, lock the water cavity dorsad the central point of the one end of valve block puts and has seted up the outlet, the central point of valve block puts and is provided with water passing structure, makes the water that has certain pressure in the runner of intaking can pass through water passing structure gets into lock the water cavity, the floater through an axle center with the piston rod of the central point of valve block puts the coincidence wears to locate on the disk seat, the piston rod can follow in the activity process the outside of outlet is closed the outlet.

According to the utility model discloses a some embodiments, the disk seat is provided with valve body and lower valve body, go up the valve body with connect into an organic whole and form one through the flange between the valve body down and hold the chamber, the valve block is compressed tightly between the two and will hold the chamber and separate for being located the upper end the intake antrum with be located the lower extreme the lock water cavity.

According to some embodiments of the utility model, the axis position of going up the valve body is provided with water inlet pipe spare, water inlet runner sets up in on the water inlet pipe spare, water inlet runner's lower extreme sets up to the conical surface valve port, water inlet pipe spare outside pipe wall the middle part be provided with water inlet runner central line vertically locating surface, it corresponds to go up the upper end of valve body the locating surface is provided with the degree of depth holding ring, water inlet pipe spare install in pass through when going up on the valve body the locating surface supports and leans on the degree of depth holding ring comes the accurate positioning conical surface valve port is located go up the degree of depth size in the valve body.

According to some embodiments of the present invention, the water inlet pipe is connected to the upper valve body by a screw.

According to some embodiments of the utility model, the lower extreme of going up the valve body is provided with presses the platform, press the terminal surface of platform the terminal surface of degree of depth holding ring and go up the flange face of valve body lower extreme and be parallel to each other, the valve body corresponds down press the platform to be provided with the high step, the step face of high step with the flange face of valve body upper end is parallel down, the valve block compress tightly in press the platform with between the high step.

According to the utility model discloses a some embodiments, the valve block adopts high temperature resistant rubber to make, the lower terminal surface of valve block is provided with concentric holding ring, be provided with concentric constant head tank down on the valve body, concentric constant head tank's axle center with the axis coincidence of valve body down, it inlays to use concentric holding ring in the concentric constant head tank.

According to the utility model discloses a some embodiments, the valve block in center in the region that concentric holding ring encloses is provided with the boss, the inside packing of boss has the enhancement sheetmetal, the toper mounting hole big-end-up is seted up and is passed through at the center of enhancement sheetmetal the toper mounting hole is installed a plunger, the plunger adopts hard material to make, and the cross sectional dimension of plunger is greater than intake runner's size, the central point of plunger puts and is provided with the limbers, the cross-sectional area of limbers is less than intake runner's cross-sectional area.

According to some embodiments of the utility model, the plunger is close to intake runner's one end be provided with conical surface valve port complex conical surface case, the end of conical surface case is annular platform.

According to the utility model discloses a some embodiments, the axis position detachably of lower valve body is provided with the water control part, the outlet is seted up in on the water control part, the upper end of water control part is provided with and runs through the cylinder of limbers, the cylinder with reserve between the limbers has annular water clearance, and the cross-sectional area in water clearance is less than the cross-sectional area of outlet, thereby passes through the water clearance forms cross the water structure.

According to the utility model discloses a some embodiments, the valve block top is provided with spacing preforming, the confession has been seted up at spacing preforming's center the hole of stepping down that the plunger passed, the valve body is in down the inboard of high step is provided with low step, the projection on the horizontal plane is arranged in to the outer fringe position of boss falls on the low step, the valve block quilt the regional radial length who centers on with one heart constant head tank is greater than the diameter of concentric constant head tank, and the plunger supports and leans on during the tip of intake runner and the boss supports and leans on during the low step, tensile deformation has not taken place for the valve block.

According to the utility model discloses a some embodiments, a plurality of water holes of crossing have been seted up on the spacing preforming, spacing preforming with the valve block adaptation the plunger supports and leans on in the tip of runner of intaking, the valve block laminating spacing preforming.

According to the utility model discloses a some embodiments, be provided with the turriform spring in the lock water cavity, the upper end top of turriform spring is held the valve block.

According to some embodiments of the utility model, the disk seat in the outside of outlet is provided with the installation wall, the piston rod is worn to locate correspond on the installation wall the position of outlet.

According to some embodiments of the utility model, the valve support to the outside extension of outlet is provided with the round and extends the wall extend the terminal installation apron of wall, through the apron forms the installation wall, and seted up the outlet on the apron.

According to some embodiments of the utility model, the piston rod is close to the one end of outlet is provided with the silica gel pad.

According to the utility model discloses a some embodiments, a plurality of delivery ports have been seted up to the circumferencial direction of intake antrum, the cross-sectional area sum of delivery port is greater than intake runner's cross-sectional area.

The utility model provides a high accuracy water level control ball-cock assembly's theory of operation as follows:

the floating ball valve is under the effect of external water pressure, the water of the water inlet runner is injected into the water locking cavity all the time through the water passing structure at the center of the valve block, the water locking cavity is always kept in a full water state, the incompressible characteristic of water is utilized, as long as the size of the water discharge resistance is adjusted (embodied as the opening and closing size of a water discharge opening), the water pressure in the water locking cavity can be synchronously changed, the stress on two sides of the valve block can be out of balance, the valve block is caused to move, the opening degree of the valve is changed, the water flow is changed, the change of the water flow can be caused to change the water pressure of the water inlet runner, the valve block generates reaction force.

Specifically, when the water level rises, the floating ball drives the piston rod to move upwards, the gap between the rubber sheet at the top end of the piston rod and the water outlet is reduced, the water discharge resistance is increased, the water pressure in the water locking cavity rises, the valve plate moves upwards, the width between the plunger and the water inlet channel is reduced, the water inflow is reduced, the water flow is reduced, the water pressure of the water inlet channel is increased, the valve plate is subjected to opposite acting forces, and the displacement is stopped until the stress on the two sides of the valve plate is equal. When the water level continues to rise, the piston rod continues to move upwards to block the water outlet, the water discharge is zero, the water pressure in the water locking cavity reaches the maximum and is the same as the water pressure in the water inlet flow channel, and the valve plate moves upwards under the action of upward thrust until the valve is closed because the cross sectional area of the water locking cavity is larger than that of the water inlet flow channel.

When the water level is reduced and the floating ball drives the piston rod to move downwards, the gap between the rubber sheet at the top end of the piston rod and the water outlet is increased, the water discharge resistance is reduced, the water pressure in the water locking cavity is reduced, the valve plate moves downwards, the water inflow is increased, the water flow is increased, the water pressure of the water inlet flow channel is reduced, the valve plate is subjected to opposite acting force, and the displacement is stopped until the stress on the two sides of the valve plate is equal. When the water level continues to be reduced and the piston rod is lowered to the lowest position, the water discharge amount of the water discharge opening is maximum, the water pressure in the water locking cavity is minimum, the valve plate is lowered to the lowest position, and the water inlet amount reaches the maximum. The size of the gap between the silica gel pad at the top end of the piston rod and the water discharge opening determines the opening of the valve, so that the water inlet flow is controlled.

To sum up, the utility model provides a high accuracy water level control ball-cock assembly designs, has the automatically regulated inflow, follows the function that the demand changes in real time, is particularly suitable for circulating steam boiler's the supply of intaking. The utility model provides a floating ball valve just can open the outlet at the minimum distance of floater decline to intercommunication water inlet channel realizes intaking, is applicable to the in service behavior of steam boiler more traditional floating ball valve structure, can not appear intaking untimely the condition of taking place dry combustion method often, and the practicality is strong.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following figures and examples:

fig. 1 is an exploded view of the present invention;

FIG. 2 is a schematic view showing a water-locking state of the valve plate;

FIG. 3 is a schematic view of the valve plate in water inlet state;

FIG. 4 is a schematic view of a structure of the valve plate;

FIG. 5 is a schematic view of one configuration of the upper valve body;

FIG. 6 is a schematic view of one configuration of a water control member.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 3, the utility model discloses a high accuracy water level control float valve of an embodiment, including disk seat and floater 112, the disk seat is provided with the intake antrum 203 of center coincidence, lock water cavity 204 and be located valve block 104 between the two, intake antrum 203 corresponds the central point of valve block 104 and puts and has seted up intake runner 201, intake runner 201's cross-sectional area is less than the cross-sectional area of lock water cavity 204, lock water cavity 204 deviates from the central point of the one end of valve block 104 and puts and has seted up outlet 205, the central point of valve block 104 puts and is provided with water structure, make the water that has certain pressure in intake runner 201 can pass through water structure and enter lock water cavity 204, floater 112 wears to locate on the disk seat through the piston rod 109 of an axle center position coincidence with valve block 104, piston rod 109 can follow the closed outlet 205 in the outside of outlet 205 in the activity process. Referring to fig. 5, a plurality of water outlets 202 are formed in the circumferential direction of the inlet chamber 203, and the sum of the cross-sectional areas of the water outlets 202 is larger than the cross-sectional area of the inlet flow path 201.

Specifically, the valve seat is provided with an upper valve body 101 and a lower valve body 106, the upper valve body 101 and the lower valve body 106 are connected into a whole through a flange to form a containing cavity, and the valve plate 104 is compressed between the upper valve body and the lower valve body and divides the containing cavity into a water inlet cavity 203 at the upper end and a water locking cavity 204 at the lower end.

The central axis of the upper valve body 101 is provided with a water inlet pipe 100, the water inlet channel 201 is arranged at the axis of the water inlet pipe 100, the lower end of the water inlet channel 201 is provided with a conical surface valve port, the middle part of the outer side pipe wall of the water inlet pipe 100 is provided with a positioning surface vertical to the central line of the water inlet channel 201, the upper end of the upper valve body 101 is provided with a depth positioning ring 209 corresponding to the positioning surface, and when the water inlet pipe 100 is installed on the upper valve body 101, the depth dimension of the conical surface valve port in the upper valve body 101 is accurately positioned by abutting against. The water inlet pipe 100 is integrally connected to the upper valve body 101 by a screw connection.

With the structure arranged in this way, the connection strength of the upper valve body 101 and the lower valve body 106 is far better than that of the prior art with the patent number of CN101825905B, and the valve is suitable for high-pressure conditions. And the assembly precision can be effectively improved through flange connection, the parallelism between the flange surface of the lower end surface of the upper valve body 101 and the depth positioning ring 209 can be ensured, and the direction and the position of the lower end surface of the water inlet pipe fitting 100 can be accurately positioned. In this way, the valve plate 104 and the piston rod 109 which are coaxially arranged are combined, so that the machining precision can be effectively ensured, and the machining is convenient.

In order to realize the installation of the valve plate 104, preferably, the lower end of the upper valve body 101 is provided with a pressing platform, the end surface of the depth positioning ring 209 and the flange surface of the lower end of the upper valve body 101 are parallel to each other, the lower valve body 106 is provided with a high step corresponding to the pressing platform, the step surface of the high step is parallel to the flange surface of the upper end of the lower valve body 106, and the valve plate 104 is tightly pressed between the pressing platform and the high step. The valve plate 104 is made of high-temperature-resistant rubber, the lower end face of the valve plate 104 is provided with a concentric positioning ring 208, the lower valve body 106 is provided with a concentric positioning groove, the axis of the concentric positioning groove coincides with the central axis of the lower valve body 106, and the concentric positioning ring 208 is embedded in the concentric positioning groove to ensure that no position deviation occurs in the working process.

Further, referring to fig. 4, a boss is disposed in the center of the valve plate 104 in the region surrounded by the concentric positioning ring 208, the reinforcing metal sheet 207 is filled in the boss, a tapered mounting hole 210 with a large top and a small bottom is formed in the center of the reinforcing metal sheet 207, a plunger 103 is mounted through the tapered mounting hole 210, the plunger 103 is made of hard material, the cross-sectional size of the plunger 103 is larger than that of the water inlet channel 201, a water through hole 213 is disposed in the center of the plunger 103, and the cross-sectional area of the water through hole 213 is smaller than that of the water inlet channel 201.

Referring to fig. 2, 3 and 6, a conical valve body 212 engaged with the conical valve port is provided at one end of the plunger 103 close to the inlet channel 201, and the end of the conical valve body 212 is a flat surface, and the end of the conical valve body 212 is an annular flat surface due to the existence of the water through hole 213. When the valve plate 104 is close to the water inlet channel 201, the valve plate can be closed by inserting the conical valve core 212 into the conical valve port at the end of the water inlet channel 201, and the area of the annular platform and the area of the conical surface jointly form a force bearing surface for the downward movement of the plunger 103.

The central axis of the lower valve body 106 is detachably provided with a water control component 107, the water outlet 205 is opened on the water control component 107, referring to fig. 2, fig. 3 and fig. 6, the upper end of the water control component 107 is provided with a cylinder 211 penetrating through the water through hole 213, an annular water passing gap is reserved between the cylinder 211 and the water through hole 213, and the cross-sectional area of the water passing gap is smaller than that of the water outlet 205, so that a water passing structure is formed through the water passing gap. The drain opening 205 is provided in the bottom of the water control member 107, and in order to communicate the drain opening 205 with the water lock chamber 204, referring to fig. 6, a horizontal through hole 214 is provided in the bottom of the water control member 107, the through hole 214 passes through the water control member 107 in the horizontal direction so that both ends communicate with the water lock chamber 204, and the upper end of the drain opening 205 communicates with the through hole 214.

Valve block 104 top is provided with spacing preforming 102, the hole of stepping down that supplies plunger 103 to pass is seted up at spacing preforming 102's center, lower valve body 106 is provided with low step in the inboard of high step, the projection that the outer fringe position of boss was arranged in on the horizontal plane falls on low step, the regional radial length that valve block 104 was surrounded by concentric positioning groove is greater than the diameter of concentric positioning groove to when plunger 103 supports the tip that leans on into water runner 201 and the boss supports and leans on low step, valve block 104 all does not take place tensile deformation.

Furthermore, a plurality of water holes are formed in the limiting pressing piece 102, the limiting pressing piece 102 is matched with the valve plate 104, and when the plunger 103 abuts against the end of the water inlet flow channel 201, the valve plate 104 is attached to the limiting pressing piece 102. The water passing gap and the water passing holes provide a water inlet and outlet channel between the valve plate 104 and the limiting pressing plate 102 when the valve plate 104 moves up and down, so that the phenomenon of air suction adhesion between the valve plate 104 and the limiting pressing plate is avoided, and the flexibility of the up-and-down movement of the valve plate 104 is ensured.

By adopting the ball cock with the structure, the cooperation of the reinforcing metal sheet 207 and the low step realizes the downward limit of the valve plate 104, the cooperation of the plunger 103 and the end part of the water inlet pipe and the cooperation of the valve plate 104 and the limiting pressing sheet 102 realize the upward limit of the valve plate 104, compared with the prior art with the patent number of CN101825905B, the valve plate 104 does not generate tensile deformation in the whole up-and-down movement process, and the service life can be effectively prolonged under the working state of high pressure and high temperature, so that the ball cock is suitable for a steam boiler.

The whole structure is concentrically arranged, so each structure can be manufactured by adopting one machining center, and in the prior art with the patent number of CN101825905B, turning and milling are needed, namely, a plurality of machining centers are needed for machining, so that the production efficiency is higher, and the size precision is higher. And the whole structure is arranged concentrically, and compared with the prior art with the patent number of CN101825905B, the required installation size is smaller, and the application range is wider.

Because intake chamber 203 is provided with delivery port 202, consequently when valve block 104 descends, the thrust can not be too big, and when valve block 104 ascended on the contrary, the pressure of the water pressure in lock water chamber 204 to valve block 104 can be great, consequently the setting of spacing preforming 102 can prevent effectively that valve block 104 from taking place tensile deformation because of the water pressure in lock water chamber 204, effectively prolongs the life of valve block 104. And the low step can effectively prevent the valve plate 104 from deforming downwards to limit downwards. Accordingly, the plunger 103 is attached through the tapered attachment hole 210, and the thrust force applied to the valve sheet 104 can be effectively ensured to act on the plunger 103.

Because the cylinder 211 and the plunger 103 are made of hard materials, and the plunger 103 moves up and down relative to the cylinder 211 in the working process, the formed water passing gap is dynamic, the dynamic water passing structure has the function of preventing sundry particles from blocking the annular water passing gap, and tiny particles which can enter the water locking cavity 204 through the annular water passing gap can be smoothly discharged from the water discharge opening 205 and cannot be accumulated in the water locking cavity 204, so that the water locking cavity 204 is ensured to have a long-term, stable and reliable water control function. This is an effect that the prior art with patent No. CN101825905B could not achieve.

As the working time increases, the cylinder 211 can be worn, so that the detachable arrangement can realize the detachment and replacement of the cylinder 211, and the prior art with the patent number CN101825905B needs to replace the float valve integrally, so that the use cost is greatly reduced compared with the prior art with the patent number CN 101825905B.

Further, a tower-shaped spring 105 is arranged in the water locking cavity 204, and the upper end of the tower-shaped spring 105 supports the valve plate 104. The tower spring 105 provides a certain upward urging force to the valve plate 104 to ensure that water is locked when the water locking chamber 204 is not pressurized at low water pressure.

As shown in fig. 2 and fig. 3, in some embodiments, a circle of extension wall 113 extends from the valve seat to the outside of the drain opening 205, a cover plate 111 is mounted at the end of the extension wall 113, a mounting wall is formed outside the drain opening 205 through the cover plate 111, a drain opening 206 is formed in the cover plate 111, and the piston rod 109 is inserted through the cover plate 111 at a position corresponding to the drain opening 205 through a sliding bearing 110.

And a silicone gasket 108 is provided at one end of the piston rod 109 near the drain opening 205 to ensure sealability against the drain opening 205.

In the prior art with patent number CN101825905B, the piston part is eccentric structure, consequently can take place the beat, and wearing and tearing are serious, and the utility model discloses in change into concentric structure, the motion is more stable, and life is longer.

The utility model provides a high accuracy water level control ball-cock assembly's theory of operation as follows:

under the action of external water pressure, water in the water inlet channel 201 is always injected into the water locking cavity 204 through the water passing structure in the center of the valve plate 104, the water locking cavity 204 is always kept in a full water state, the incompressible characteristic of the water is utilized, and as long as the size of the water discharge resistance (embodied as the opening and closing size of the water discharge opening 205) is adjusted, the water pressure in the water locking cavity 204 is synchronously changed, the stress on the two sides of the valve plate 104 is unbalanced, so that the valve plate 104 is displaced to change the opening degree of the valve, the water flow is changed, the water pressure in the water inlet channel 201 is changed due to the change of the water flow, and a reaction force is generated on the valve plate 104, so that new dynamic balance.

Specifically, when the water level rises and the floating ball 112 drives the piston rod 109 to move upwards, the gap between the film at the top end of the piston rod 109 and the water outlet 205 is reduced, the water discharge resistance is increased, the water pressure in the water locking cavity 204 rises, the valve sheet 104 moves upwards, the width between the plunger 103 and the water inlet channel 201 is reduced, the water inlet amount is reduced, the water flow is reduced, the water pressure of the water inlet channel 201 rises, the valve sheet 104 is subjected to opposite acting forces, and the displacement is stopped until the two sides of the valve sheet 104 are stressed equally. When the water level continues to rise and the piston rod 109 continues to move upwards to block the drain opening 205, the drain is zero, the water pressure in the water locking cavity 204 reaches the maximum and is the same as the water pressure in the water inlet channel 201, and the valve plate 104 moves upwards under the upward thrust until the valve is closed because the cross-sectional area of the water locking cavity 204 is larger than that of the water inlet channel 201.

When the water level is lowered, the floating ball 112 drives the piston rod 109 to move downwards, the gap between the rubber sheet at the top end of the piston rod 109 and the water discharge opening 205 is increased, the water discharge resistance is reduced, the water pressure in the water locking cavity 204 is reduced, the valve plate 104 moves downwards, the water inflow is increased, the water flow is increased, the water pressure of the water inlet flow channel 201 is reduced, the valve plate 104 is subjected to opposite acting forces, and the displacement is stopped until the two sides of the valve plate 104 are stressed equally. When the water level continues to be reduced and the piston rod 109 is reduced to the lowest position, the water discharge amount of the water discharge opening 205 is the largest, the water pressure in the water locking cavity 204 is the lowest, the valve plate 104 is reduced to the lowest, and the water inlet amount reaches the largest. The size of the gap between the silica gel pad 108 on the top end of the piston rod 109 and the water discharge opening 205 determines the size of the opening of the valve, so that the inflow rate of water is controlled.

To sum up, the utility model provides a high accuracy water level control ball-cock assembly designs, has the automatically regulated inflow, follows the function that the demand changes in real time, is particularly suitable for circulating steam boiler's the supply of intaking. The utility model provides a floating ball valve just can open outlet 205 at the minimum distance that floater 112 descends to intercommunication inlet channel 201 realizes intaking, is applicable to steam boiler's in service behavior more traditional floating ball valve structure, can not appear intaking untimely the condition of taking place dry combustion method often, and the practicality is strong.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The high-precision water level control float valve is characterized by comprising a valve seat and a float ball, wherein the valve seat is provided with a water inlet cavity, a water locking cavity and a valve block, the center of the water inlet cavity is coincided with the center of the valve block, the cross section area of the water inlet channel is smaller than that of the water locking cavity, the water locking cavity is back to the center of one end of the valve block, a water outlet is formed in the center of the water locking cavity, a water passing structure is arranged in the center of the valve block, water with certain pressure in the water inlet channel can enter the water locking cavity through the water passing structure, the float ball is arranged on the valve seat in a penetrating mode through a piston rod, the axis of the piston rod is coincided with the center of the valve block, and the water outlet can be closed from the outer side of the water outlet in the moving process of the piston.

2. The high-precision water level control float valve according to claim 1, wherein the valve seat is provided with an upper valve body and a lower valve body, the upper valve body and the lower valve body are connected into a whole through a flange and form an accommodating cavity, and the valve plate is compressed between the upper valve body and the lower valve body and divides the accommodating cavity into the water inlet cavity at the upper end and the water locking cavity at the lower end.

3. The high precision water level control float valve according to claim 2, wherein a water inlet pipe is arranged at a central axis of the upper valve body, the water inlet channel is arranged on the water inlet pipe, a lower end of the water inlet channel is provided with a conical surface valve port, a positioning surface perpendicular to a central line of the water inlet channel is arranged at a middle part of an outer pipe wall of the water inlet pipe, a depth positioning ring is arranged at an upper end of the upper valve body corresponding to the positioning surface, and the depth dimension of the conical surface valve port in the upper valve body is accurately positioned by the positioning surface abutting against the depth positioning ring when the water inlet pipe is mounted on the upper valve body.

4. A high precision water level control float valve according to claim 3, characterized in that the lower end of said upper valve body is provided with a pressure table, the end surface of said depth positioning ring and the flange surface of the lower end of said upper valve body are parallel to each other, said lower valve body is provided with a high step corresponding to said pressure table, the step surface of said high step is parallel to the flange surface of the upper end of said lower valve body, and said valve plate is compressed between said pressure table and said high step.

5. A high precision water level control float valve as claimed in claim 4, wherein said valve plate is made of high temperature resistant rubber, the lower end surface of said valve plate is provided with a concentric positioning groove, said lower valve body is provided with a concentric positioning groove, the axis of said concentric positioning groove coincides with the central axis of said lower valve body, said concentric positioning ring is embedded in said concentric positioning groove.

6. The high-precision water level control float valve according to claim 5, wherein a boss is arranged in a region surrounded by the concentric positioning rings, a reinforcing metal sheet is filled in the boss, a conical mounting hole with a larger upper part and a smaller lower part is formed in the center of the reinforcing metal sheet, a plunger is mounted through the conical mounting hole, the plunger is made of hard material, the cross section of the plunger is larger than the size of the water inlet flow passage, and a water through hole is formed in the center of the plunger.

7. The high precision water level control float valve according to claim 6, wherein one end of said plunger near said inlet channel is provided with a conical valve core engaged with said conical valve port, and the end of said conical valve core is an annular platform.

8. The high-precision water level control float valve according to claim 7, wherein a water control member is detachably disposed at a central axis position of the lower valve body, the water outlet is opened on the water control member, a cylinder penetrating through the water through hole is disposed at an upper end of the water control member, an annular water passing gap is reserved between the cylinder and the water through hole, and a cross-sectional area of the water passing gap is smaller than a cross-sectional area of the water outlet, so that the water passing structure is formed by the water passing gap.

9. The high-precision water level control float valve according to claim 6, 7 or 8, wherein a limiting pressing plate is arranged above the valve plate, a yielding hole for the plunger to pass through is formed in the center of the limiting pressing plate, the lower valve body is provided with a low step on the inner side of the high step, the projection of the outer edge of the boss on the horizontal plane falls on the low step, the radial length of the area of the valve plate surrounded by the concentric positioning grooves is larger than the diameter of the concentric positioning grooves, and the valve plate is not subjected to tensile deformation when the plunger abuts against the end of the water inlet flow channel and when the boss abuts against the low step.

10. The high precision water level control float valve according to claim 9, wherein a tower spring is arranged in the water locking cavity, and the upper end of the tower spring supports the valve plate.

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