CN106763810B

CN106763810B - Water volume server with sensitive control

Info

Publication number: CN106763810B
Application number: CN201611234725.2A
Authority: CN
Inventors: 金晶; 梁稳; 杨开明; 茅忠群; 诸永定; 周高云
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2016-12-28
Filing date: 2016-12-28
Publication date: 2022-11-18
Anticipated expiration: 2036-12-28
Also published as: CN106763810A

Abstract

The invention relates to a water quantity server with sensitive control, which comprises a valve body, wherein a valve rod is arranged in a valve cavity of the valve body, and the valve body is provided with a water inlet hole positioned on the side wall and a water outlet hole positioned at the lower part; the servo motor is in driving connection with the valve rod, and a valve core for closing the water outlet hole is arranged at the lower end part of the valve rod; the valve is characterized in that the middle part of the valve core is provided with a step hole with a large upper part and a small lower part, the valve rod is arranged in the step hole in a penetrating way and has a gap with the inner wall of the step hole, and the gap is communicated with the valve cavity; an upper limiting piece, a sealing piece used for sealing the lower section of the stepped hole and a lower limiting piece are sequentially arranged on the valve rod from top to bottom; the valve core is positioned between the upper limiting part and the lower limiting part, and the distance between the upper limiting part and the lower limiting part is greater than the height of the valve core; the outer diameter of the sealing element is smaller than the caliber of the upper section of the stepped hole; an elastic piece is arranged in the valve cavity, and the upper end and the lower end of the elastic piece are respectively abutted against the top wall of the valve cavity and the valve core.

Description

Water volume server with sensitive control

Technical Field

The invention relates to a water quantity server, in particular to a water quantity server with sensitive control.

Background

A water quantity servo mechanism is usually arranged in an existing water flow system, particularly a gas water heater, and a water quantity servo can automatically adjust the water inlet flow according to the change conditions of the hot water outlet temperature, the water pressure, the air pressure and the water inlet temperature, so that the dual adjustment of water and air is really realized, and the accuracy and the constancy of the water outlet temperature are ensured.

However, most of the existing water volume servers have the problems of high noise, poor linearity of a water volume adjusting rod and the like in the working process, most of water volume servo structures do not have the function of completely closing water volume, and the phenomenon of water leakage occurs after the water volume servo structures are shut down; or in order to avoid the dripping phenomenon, the valve is closed too tightly, so that the opening torque force is too large after the machine is started again, or the valve cannot be opened, and the like, thereby influencing the normal use function.

Disclosure of Invention

The invention aims to solve the technical problem of providing a water quantity server which is sensitive in opening and closing, good in sealing performance and sensitive in control aiming at the current situation of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the water quantity server with sensitive control comprises a valve body, wherein a valve rod is arranged in a valve cavity of the valve body, and a water inlet hole in the side wall and a water outlet hole in the lower part are formed in the valve body; the servo motor is connected with the valve rod in a driving mode, and a valve core used for closing the water outlet hole is arranged at the lower end of the valve rod;

the method is characterized in that:

the middle part of the valve core is provided with a step hole with a large upper part and a small lower part, the valve rod is arranged in the step hole in a penetrating way, a gap is formed between the valve rod and the inner wall of the step hole, and the gap is communicated with the valve cavity;

an upper limiting piece, a sealing piece used for sealing the lower section of the stepped hole and a lower limiting piece are sequentially arranged on the valve rod from top to bottom; the valve core is positioned between the upper limiting piece and the lower limiting piece, and the distance between the upper limiting piece and the lower limiting piece is larger than the height of the valve core; the outer diameter of the sealing element is smaller than the caliber of the upper section of the stepped hole;

an elastic piece is further arranged in the valve cavity, and the upper end and the lower end of the elastic piece are respectively abutted against the top wall of the valve cavity and the valve core.

Preferably, the valve core comprises a base and a sealing ring connected to the base, and the stepped hole is formed in the base.

Preferably, the base may comprise an upper seat and a lower seat which are butted with each other; the sealing ring is embedded between the upper seat and the lower seat, and a downward convex flange is arranged on the bottom surface of the sealing ring; correspondingly, a convex step is arranged on the inner wall of the valve cavity, and the flange abuts against the convex step to close the water outlet hole. The structure not only facilitates the assembly of the valve core, but also reduces the manufacturing precision of the sealing ring and simultaneously improves the sealing performance between the sealing ring and the water outlet.

As a further improvement of the above solutions, a turbine may be provided in the water inlet hole.

Preferably, a flow guide sleeve is sleeved in the water outlet hole, and the aperture of the flow guide sleeve is gradually reduced along the water flow direction. The turbine in this scheme and the downthehole water conservancy diversion sleeve cooperation of water outlet can form rivers vortex structure to avoid rivers to get into the torrent phenomenon that the water pressure releases suddenly and leads to and the noise that leads to from this behind the cavity from the inlet opening.

Compared with the prior art, the water quantity server provided by the invention can completely close the water outlet hole, and avoids the phenomenon of water flow leakage after the valve is closed in the prior art; and because the two-stage valve opening is adopted, the valve opening is not influenced by water pressure, the phenomenon that the valve cannot be opened again after water flow is closed is completely avoided, the water flow regulation linearity is good, and the noise is low.

Drawings

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention;

FIG. 2 is a longitudinal cross-sectional plan view of an embodiment of the present invention with the valve cartridge fully open;

FIG. 3 is a plan view in longitudinal section of an embodiment of the present invention with the valve spool in a half-open condition;

FIG. 4 is a plan view in longitudinal cross-section of a valve cartridge closed condition in accordance with an embodiment of the present invention;

FIG. 5 is a partial cross-sectional view of the valve cartridge and valve stem engagement in an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a valve cartridge in an embodiment of the invention

FIG. 7 is a perspective view of a turbine according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 7, the control-sensitive water volume servo includes:

the valve body 1 is a shell of the whole switch, a water inlet hole 11 is arranged on the side wall of the valve body, and a water outlet hole 12 is arranged at the lower end part of the valve body; the water outlet 12 is provided with a flow guide sleeve 7 in a sleeved manner, the aperture of the flow guide sleeve 7 along the water flow direction is gradually reduced, and the inner hole of the flow guide sleeve 7 is conical. The wall of the valve chamber 13 is provided with a step 14 above the flow guide sleeve 7. A water flow type turbine 6 is arranged in the water inlet hole 11.

The valve rod 2 is arranged in the valve cavity 13, is connected with a servo motor (not shown in the figure), and moves up and down in the valve cavity 13 under the driving of the servo motor. The valve rod 2 is provided with an upper limiting member 21, a sealing member 23 and a lower limiting member 22 at intervals from top to bottom in sequence. The distance between the upper and

lower stoppers

21 and 22 is greater than the height of the spool 3.

The valve core 3 is positioned between the upper limiting piece 21 and the lower limiting piece 22 and comprises a base and a sealing ring 33, wherein the base comprises an upper seat 32 and a lower seat 34 which are mutually butted through step matching; the seal ring 33 is fitted between the upper seat 32 and the lower seat 34, and the seal ring 33 has a downwardly convex flange 35 on the bottom surface. The flange 35 abuts against the step 14 to close the outlet hole 12; the gap between the flange 35 and the step 14 is a primary orifice.

The upper seat 32 is provided with a groove 36 for accommodating the elastic member 5.

The middle part of the base is provided with a step hole 31 with a large upper part and a small lower part, the valve rod 2 is arranged in the step hole 31 in a penetrating way, a gap 4 is formed between the valve rod and the inner wall of the step hole 31, and the gap 4 is communicated with the valve cavity 13; the gap 4 forms a secondary orifice of the water volume servo.

The outer diameter of the sealing element 23 is smaller than the upper section caliber of the stepped hole 31, and can be matched with the lower section of the stepped hole to close the secondary throttling hole.

The elastic component 5, which is a spring in this embodiment, is sleeved on the valve rod 2, and the upper end and the lower end of the elastic component 5 respectively abut against the top wall of the valve cavity 13 and the upper seat 32.

As shown in fig. 1 and 2, in the full flow rate state, the lower seat abuts against the lower stopper under the pressure of the elastic member, and the water flows into the valve chamber through the water inlet hole, simultaneously enters the primary orifice and the secondary orifice, and then flows out through the water outlet hole.

When water outlet is closed, the servo motor drives the valve rod to move downwards, the valve core moves downwards along with the valve rod under the action of the spring, the primary throttling hole is gradually reduced, the water outlet flow is gradually reduced, and after a flange on the sealing ring is abutted to the convex step, the primary throttling hole is closed, as shown in fig. 3; at the moment, the sealing ring is accommodated in the upper section hole of the stepped hole, no sealing effect is realized, the secondary throttling hole is still in an open state, and the water flow is very small.

With the continuous downward movement of the valve rod, at this time, because the valve core is abutted against the convex step, the valve core does not move downward with the valve rod until the upper limiting piece is abutted against the upper seat, the sealing ring 3 enters the lower section of the stepped hole, as shown in fig. 4, the secondary orifice is closed, and at this time, the flow is completely closed.

When the water quantity server needs to be opened, the servo motor drives the valve rod to move upwards, firstly, the sealing ring is driven to enter the upper section of the step hole, the water quantity server releases pressure, and a secondary throttling hole is opened; because the flow of the secondary orifice is small, the back pressure of the valve core can be released by small force, so that the secondary orifice can be easily opened even if the valve core is tightly closed and the external water flow pressure is large, and the phenomenon that the valve cannot be opened due to insufficient valve opening tension caused by overlarge water inlet pressure is effectively solved; and as the valve rod continues to move upwards, the valve core moves upwards along with the valve rod under the action of the lower limiting piece, the primary throttling port is opened, and the flow rate is gradually increased.

Among the prior art, under high pressure of intaking, rivers pass through the throttle mouth of sudden change, can lead to stable laminar flow rivers to become the torrent state, and under the torrent state, the rivers direction in the cavity is irregular, and striking each other, each point water pressure is not of uniform size in same cross section leads to the valve rod atress uneven, forms resonance and noise, influences servo's flow characteristic curve.

In this embodiment, the turbine disposed in the water inlet and the flow guide sleeve disposed in the water outlet form an integral water flow disturbing structure. The inlet water flow is combed through the turbine structure, so that the water flow enters the valve cavity in a vortex shape, the formation of turbulence is prevented, the impact of the inlet water flow on the valve core is reduced, and the stress balance of the valve core in the valve cavity is ensured; the water outlet hole is formed into a gradually reduced horn-shaped necking opening by the flow guide sleeve, the water flow speed difference and the pressure difference between the water outlet hole and the cavity are increased, namely, the water pressure difference between the inside of the valve cavity and the inside of the water inlet hole is reduced, a high water pressure cavity is formed in the valve cavity, and the turbulent flow phenomenon caused by sudden release of water pressure after water flow enters the cavity from the water inlet hole is avoided.

Claims

1. A servo for controlling sensitive water quantity comprises a valve body (1), a valve rod (2) is arranged in a valve cavity (13) of the valve body (1), and a water inlet hole (11) located in the side wall and a water outlet hole (12) located in the lower portion are formed in the valve body (1); the servo motor is in driving connection with the valve rod (2), and a valve core (3) for closing the water outlet hole (12) is arranged at the lower end part of the valve rod (2);

the method is characterized in that:

a step hole (31) with a large upper part and a small lower part is formed in the middle of the valve core (3), the valve rod (2) is arranged in the step hole (31) in a penetrating mode, a gap (4) is formed between the valve rod and the inner wall of the step hole (31), and the gap (4) is communicated with the valve cavity (13);

an upper limiting piece (21), a sealing piece (23) used for sealing the lower section of the stepped hole (31) and a lower limiting piece (22) are sequentially arranged on the valve rod (2) from top to bottom; the valve core (3) is positioned between the upper limiting piece (21) and the lower limiting piece (22), and the distance between the upper limiting piece (21) and the lower limiting piece (22) is larger than the height of the valve core (3); the outer diameter of the sealing element (23) is smaller than the caliber of the upper section of the stepped hole (31);

an elastic piece (5) is further arranged in the valve cavity (13), and the upper end and the lower end of the elastic piece (5) are respectively abutted to the top wall of the valve cavity (13) and the valve core (3).

2. A servo for sensitive control of water volume according to claim 1, characterized in that said cartridge (3) comprises a base and a sealing ring (33) connected to said base, said stepped hole (31) being provided in said base.

3. A servo of water volume sensitive to control as claimed in claim 2, characterized in that said base comprises an upper seat (32) and a lower seat (34) reciprocally coupled; the sealing ring (33) is embedded between the upper seat (32) and the lower seat (34), and a downward convex flange (35) is arranged on the bottom surface of the sealing ring (33); correspondingly, a convex step (14) is arranged on the inner wall of the valve cavity (13), and the flange (35) abuts against the convex step (14) to close the water outlet hole (12).

4. A servo device for controlling a sensitive quantity of water according to any one of claims 1 to 3, characterised in that said inlet opening (11) is internally provided with a turbine (6).

5. The servo of claim 4, wherein the outlet hole (12) is sleeved with a flow guide sleeve (7), and the diameter of the flow guide sleeve (7) is gradually reduced along the water flow direction.