CN1064118C - Ball valve - Google Patents

Abstract

The present invention provides a ball valve which has the advantages of fast and reliable action, low cost, small required acting force when releasing partition, quick back pressure recover, and micro flow rate adjustment. The ball valve comprises a valve body (2) forming a fluid channel (20), a valve seat (6) arranged in a route of the fluid channel (20), a valve core (5), an operating rod (7) and a connecting rod (9), wherein the valve core (5) contacts the valve seat or separates from the valve seat and cooperates with the valve seat to obstruct the flow channel and/or regulate the flow rate of the flow channel; the operating rod (7) is inserted into the valve body and can move along a vertical direction; one end of the connecting rod (9) can be connected with the front end of the inserted side of the operating rod in an automatically swinging mode in a fluid flowing direction, and the other end is fixedly connected with the valve core; moreover, the valve core is prepared with an intercommunicating pore by which an upstream side and a down stream side can be communicated and an open-close device which opens or closes the intercommunicating pore.

Description

Ball valve

The present invention relates to a kind of ball valve that is arranged in the fluid course way, particularly a kind of can emergency work condition and nominal situation use on both side as stop valve and ball valve that can the regulated fluid flow.

Existing ball valve type stop valve has been known technology.The structure of this valve is, runner upstream side and downstream side are separated with spherical spool and valve seat, pass the center of this spherical spool, form the hole that upstream side is communicated with the downstream side, by the rotation motion that is fixed on the operating stem on the spherical spool, regulate with the runner partition or to flow.

This ball valve of prior art has also adopted such structure, the dividing plate that utilization is parallel to each other is divided into two fluid chambers with runner, valve seat is arranged on the dividing plate, on the Vertical direction of relative valve seat, screw thread on the operating stem that utilization is arranged on spool is connected mutually is right after on valve seat the spool of making as spherical.

But there is following problems in above-mentioned known stop valve.In above-mentioned ball-valve structure, because spool bore is made the connection form consistent with fluid passage, like this, the spool revolution makes fluid passage upstream side and the connection of downstream side part and is in semi-connected state through via hole, particularly when the spool revolution makes fluid passage be in the partition state, fluid is enclosed in spool bore and its outside overcurrent part, so, when thermal expansion takes place, can damage the sealed member that is provided with around the operating stem.

In addition, because spool very closely engaging with valve seat, so the required moment of torsion of operating stem rotation motion is big, operating difficulties.Particularly, when runner is in the partition attitude, because spool is subjected to fluid pressure action, make spool more near valve seat, tightness degree strengthens, easier damage valve seat.

Say that again be easy to sandwich foreign material such as iron rust between the fluid passage end of spool and the valve seat, its reason is that foreign material lodge in the bottom of flow passage.

Again because the fluid flowing path bending increases energy loss.

Above-mentioned ball valve, during nominal situation, owing to through the mobile curved that is complexity of the fluid of valve seat part, the pressure loss is increased, so, this stop valve mostly adopts the insertion method in pipe-line system, but unsatisfactory.Also have, owing to adopted worm structure on the operating stem, it is very time-consuming to cut off action, and when emergency work condition, movement speed is slowly particularly outstanding especially.When cutting off high-pressure liquid, high-pressure spray muscle power directly acts on operating stem, just needs bigger power or moment to operate.This valve also exists complex structure, the problem that expense is high.

One of purpose of the present invention is, for providing a kind of, the various defectives that overcome above-mentioned valve are swift in motion, and ball valve with low cost.

Another object of the present invention is, the active force when providing a kind of relief valve to cut off state is little, and it is fast that back pressure is recovered, and can regulate the ball valve of tiny flow quantity.

In order to realize the foregoing invention purpose, the invention provides a kind of ball valve that this ball valve comprises:

A valve body forms a basic vertically fluid passage; At least one valve seat is positioned at this fluid passage of described valve inner midway; One spherical valve core is used for collaborative valve seat, closes said fluid channel and the fluid flow of regulating this passage; Be connected in the operation equipment of described spool, be used for the motion spool, when its direction in vertical run is moved, spool is moved at fluid flow direction, engage with valve seat, when its during in the motion of another direction, spool and valve seat are separated, and described operation equipment comprises an operating stem, inserts valve body, do vertical motion with relative runner, and comprise a connecting rod, and the one end is loaded on the inner of operating stem swingably, and the other end inserts the [that is arranged in spool, it is characterized in that: described ball valve core has a control valve intercommunicating pore, be positioned at valve core inside, and extend through in the runner direction substantially, and when spool because flowing of fluid and in runner when mobile, the other end of connecting rod can make connecting rod swing, so that spool and valve seat interoperation.

In an embodiment of the present invention, operation equipment comprises operating stem and the connecting rod that inserts along the vertical direction in the valve body.One end of connecting rod is connected with this operating stem inserting side front end in the mode that can freely swing on above-mentioned fluid flow direction, and the other end is fixedlyed connected with above-mentioned spool.

In the present application better implement example, have the intercommunicating pore that the runner upstream side is communicated with the downstream side on the spool and open and close the opening and closing device that this intercommunicating pore is used.

In most preferred embodiment, opening and closing device has: be arranged on little valve seat and the small valve core that is arranged on the above-mentioned connecting rod the other end in the intercommunicating pore way, small valve core is worked in coordination with little valve seat, can will cut off through the fluid that flows in the aforementioned intercommunicating pore and/or regulate through the fluid flow in the intercommunicating pore.

In small valve core, the little intercommunicating pore that is provided with the intercommunicating pore that will be communicated with upstream side and is connected with intercommunicating pore that the downstream side is communicated with, be provided with small valve seat and small spool in the way of this little intercommunicating pore, small spool is worked in coordination with small valve seat, the fluid that cuts off in too small intercommunicating pore is flowed and/or the fluid flow of adjusting in too small intercommunicating pore, like this, the pressure adjustment in stream upstream side and downstream side becomes multistage adjustment.Biasing arrangement by elastic material bias can also be set on small valve core.

In said structure, ball valve has the valve seat that is arranged in the fluid course way, collaborative valve seat also relies on the contact of valve seat or separates and cut off aforementioned runner and/or regulate the spool of this runner flow, be connected with this spool and make aforementioned spool and valve seat contact or the operating stem that separates, because spool is moved operating stem along the vertical direction and longshore current body flow direction is freely swung, so, spool can flow with fluid and move, and action rationally.And on the Vertical direction that fluid flows, can not produce insecure vibration action on the spool.And be swift in motion, when upstream side and downstream side pressure reversal, fluid flow commutation, thereby spool towards the valve seat of upstream side move, and with it contact avoided adverse current, simple in structure, cost is low.

In addition, because the valve Inner Front End side of operating stem links to each other with the rigidity connecting rod, but an end of connecting rod is connected with operating stem in the mode that longshore current body flow direction freely swings, first end is fixedlyed connected with spool, like this, even when the pressure of upstream side disappears, also previous operating stem mechanically can be pressed on the valve seat of downstream side, the fluid of downstream side is cut off.

Even the pressure in downstream side be higher than upstream side pressure, push back under the occasion of power greater than the mechanical force of previous operating stem being pressed to the downstream side valve seat of spool, because of spool upstream the valve seat of side move, so avoided adverse current.

Because spool is provided with the intercommunicating pore that the runner upstream side is communicated with the downstream side and opens and closes the opening and closing device that this intercommunicating pore is used, like this, in above-mentioned action, the pressure of upstream side is disappeared, required power diminished when releasing cut off.And opening and closing device is made of with the small valve core that is arranged on the connecting rod the other end the little valve seat that is arranged in the spool, and its action is simple and easy reliable.

In small valve core, be provided with little intercommunicating pore, the small spool that in the way of this little intercommunicating pore, has small valve seat and cooperate with this small valve seat, make the pressure adjustment in stream upstream side and downstream side become multistage adjustment, in above-mentioned action, can open by carrying out pressure to the order of big valve core one by one for a pressure of high pressure from small spool, small valve core, intermediate core.

On small valve core,, like this, make small valve core be easy to produce trace and move also not by the biasing arrangement of biasings such as spring, flow is adjusted meticulously, simultaneously, according to certain hour, after external force is regulated, even cancellation external force still can keep the flow setting type of setting arbitrarily.

Below in conjunction with accompanying drawing narration embodiments of the invention.

Fig. 1 is the ball valve schematic partial sectional view of one embodiment of the invention.

Fig. 2 A is the partial front figure of spool shown in Figure 1 and connecting rod and operating stem part when being in the installation situation.

Fig. 2 B is the 2B-2B sectional view of Fig. 2 A.

Fig. 3 is the front enlarged view of the operating stem front-end architecture major component of another embodiment of the present invention.

Fig. 4 is the schematic partial sectional view of ball valve shown in Figure 1 when being in semi-connected state, has omitted a part of part among the figure.

Fig. 5 is the partial front figure that an embodiment of intercommunicating pore and opening and closing device thereof is set in the spool of the present invention.

Fig. 6 is identical as the partial front figure that another embodiment of intercommunicating pore and opening and closing device thereof is set in the spool of the present invention of Fig. 5.

Fig. 7 is embodiment's partial front figure that little intercommunicating pore and small valve seat and small spool are set in the interior small valve core of spool of the present invention, has omitted a part of part among the figure.

Referring to Fig. 1, ball valve 1 provided by the present invention in tubular valve body 2, forms the runner 20 of substantially horizontal and the cavity 24 of Vertical direction.The inboard of valve body 2 horizontal components is embedded with sleeve 3,3, and the top of vertical component is equipped with covers 4.Form in the inboard of two sleeves 3,3 valve seat 6,6 '.In lid 4, operating stem embeds its inboard by sealing 17,17 from valve body 2 outsides.In the forward end 8 of operating stem 7, shown in Fig. 2 B, be formed with recess 8a.One end of connecting rod 9 embeds this recess 8a, and fixes with pin 8b.The front end of pin 8b forms bolt 8c, can prevent that with nut 8d and packing ring 8e pin from getting loose.Shown in Fig. 2 A, the other end 10 of connecting rod 9 is "T"-shaped, protruding, is fixed in the spherical spool 5.Ball valve 1 of the present invention, owing to utilized sleeve 3,3, the material of valve seat and machining accuracy etc. can decide as required, valve body 2 can use the "T"-shaped pipe joint of selling on the market, so very economical.

The material of spherical spool 5 can use and have rubber resin, metal or cover rubber or resin interlining and making on Metal Ball, and valve seat 6,6 ' employed material is different with the material property of spool 5.That is to say that if spherical spool 5 uses hard materials such as metal, the valve seat 6,6 that contacts with this spool ' can use elastic material is and if spherical spool 5 uses elastic material, valve seat 6,6 ' available hard material.

Fig. 3 represents the another kind of structure of the front end 8 of operating stem 7, also promptly makes the play structure that pin 8b can be moved in the slotted hole 8f of connecting rod 9 one ends, make thus spool and valve seat 6 or 6 ' whole circumference on impartial contact be adjacent to Du Genggao.

In Fig. 1, because the connecting rod 9 that the pin 8b of spherical spool 5 by as shown in Figures 2 and 3 fixed is connected with the front end 8 of operating stem 7, therefore, knee-action according to operating stem 7, can be along upper and lower to moving, and, freely swing owing to can remain on the fluid flow direction 21, so the motion of spool 5 is compound motions.In view of the above, as the urgent occasion of cutting off of stream need be depressed operating stem 7, just spool 5 has so just cut off runner 20 by along from upstream side 22 flow dynamic pressure effect and being close on the valve seat 6 of 23 fluid to the downstream side.Spool 5 and valve seat 6, as described above, no matter that is made by hard material among both, another is made by elastic material, utilizes the partition of structure runner 20 shown in Figure 3 reliable for effect.Again since the motion of spool 5 only by along upper and lower to and fluid flow direction move for two kinds and constitute, the motion of spool 5 can cause the vibration on fluid flows Vertical direction hardly, so its motion is steadily.

Because spool 5 is connected by rigidity connecting rod 9 with operating stem 7, after spool 5 cuts off runner, along with operating stem 7 is continued to depress towards the below, just produce couple between the downside of pin 8b and downstream side valve seat 6, except fluid pressure action, also have by operating stem 7 with action of mechanical pressure on spool 5, spool 5 closely is attached on the valve seat 6.Even make the pressure of upstream side 22 be lower than the pressure in downstream side 23 for a certain reason, in this occasion, spool 5 can not lift off a seat 6 yet, makes runner 20 keep the partition state.

Except above-mentioned situation, the occasion of only runner 20 being cut off at spool 5 by fluid pressure action, make the pressure in downstream side 23 be higher than the pressure of upstream side 22 for a certain reason, in this case, spool 5 leaves the valve seat 6 in downstream side 23 and moves towards valve seat 6 ' one sides of upstream side 22, and be close to valve chamber 6 ' on, avoided the adverse current phenomenon, can accomplish and prevent trouble before it happens.

Ball valve provided by the present invention not only can be used as stop valve, can also be used as flow control valve.As shown in Figure 4, operating stem 7 is promoted downwards, when spool 5 does not also drop to the position that cuts off runner 20, on the way just can push away by the following of shut-down operation bar 7, like this, spool 5 can keep runner to be in semi-connected state with respect to valve seat 6.According to above-mentioned semi-connected degree, just can determine the size of flow, thereby flow is regulated.In this occasion, as shown in Figure 4, fluid flow line 21 ' be along the sweep of spool 5 spheres is so the pressure loss is little when carrying out Flow-rate adjustment.

Consult Fig. 5, in spool 5, be provided with the intercommunicating pore 11 that the upstream side 22 with runner 20 is communicated with downstream side 23, and the intercommunicating pore 11a that is communicated with upstream side 22 and with intercommunicating pore 11b that downstream side 23 is communicated with between, dispose the opening and closing device 12 that opens and closes intercommunicating pore 11.The opening and closing device 12 that present embodiment adopted can adopt to be similar to known ball-type valve structure, and this structure is made of with the little valve seat 5a that contacts with it small valve core 9a.On small valve core 9a, dispose the postioning abutment 9b that connecting rod 9 is deviate from spool 5, the nut 13 downside 13a that lemon is gone in spool 5 can be used as prevent surface.

Fig. 6 is another embodiment that intercommunicating pore and opening and closing device thereof are set in spool shown in Figure 5, small valve core 9a and little valve seat 5a can adopt the structure that is similar to gate valve, other structure is identical with Fig. 5, this omission that is described in for the same section of representing with same sequence number, in addition, the structure of opening and closing device is not limited to Fig. 5 or spherical valve shown in Figure 6 or the similar structure of gate valve, also can adopt the similar structure as stopcock, needle-valve or stopcock.Can also utilize electric operation, solenoid valve is packed in the spool 5, constitute above-mentioned opening and closing device, also can link the effect identical with aforementioned effect.

Consult Fig. 7, the figure shows the structure that the pressure adjustment in runner upstream side 22 and downstream side 23 is divided into an embodiment of multistage adjustment, in little valve body 9 shown in Figure 5, be provided with the little intercommunicating pore 9e that intercommunicating pore 11a that will be communicated with upstream side and the intercommunicating pore 11b that is communicated with the downstream side are communicated with, in the centre of little intercommunicating pore 9e, dispose small valve seat 9d and small spool 9c.

The present invention is owing to adopted the structure of ball valve 1, when ball valve 1 is in opening state, the streaming flow of valve body 2 inner bottom parts directly washes away this bottom, when ball valve 1 is in closed condition, above-mentioned bottom is the structure that is communicated with the upstream side fluid, the so just alluvial that can not produce ball valve body inner bottom part fluid in the prior art can not cause precipitation and accumulation yet.

Ball valve 1 provided by the present invention, after cutting off fast, existing problem is that the power of pushing spool 5 from valve seat 6 open is very big when removing this partition.For example, be 10cm at valve seat bore, pressure is 10kgf/cm ²Situation under, required power is 785kgf, like this, it is very difficult removing with manpower, still, utilize ball valve 1 of the present invention, as Fig. 5 or shown in Figure 6, owing in spool 5, offer intercommunicating pore 11, and the opening and closing device 12 that is equipped with this intercommunicating pore of switching to use, so during the partition of relief valve, the power that needs is little.Resemble occasion shown in Figure 5, manipulation operations bar 7 engages small valve core 9a and leaves little valve seat 5a, the fluid of upstream side is side flow towards downstream just, rises as the downstream side pressure of the back pressure of spool, and the pressure reduction in upstream side 22 and downstream side 23 diminishes, so, remove that to cut off required power so just little.In order to reduce fluid force, do the diameter of small valve core 9a smaller, just easily with manpower manipulation operations bar 7.

Because Fig. 6 has adopted the structure of the another kind of gate valve of spherical valve in the alternate figures 5, thus the flow between small valve core 9a and the little valve seat 5a can cut off and regulate, like this, as the pressure rising in the downstream side of the back pressure of spool.In addition, near the other end 10 of connecting rod 9, also be provided with the resistance shelves 9b of portion, to avoid extracting connecting rod 9.

Better effects if when being the occasion of liquid that intercommunicating pore opening and closing device shown in Fig. 5,6 is used for fluid.Under the liquid occasion, because liquid is incompressible, a small amount of fluid that extrudes just can make the back pressure of spool recover.And, on the aforementioned small valve core, the biasing arrangement that spring etc. is made by elastic material can also be set, be easy to realize that small valve core produces microdisplacement, for use in the adjustment of tiny flow quantity.For example, under normal circumstances small valve core 9a is upwards promoted owing to the biasing of spring, when pressing down small valve core 9a, runner is cut off, in case decontrol, spring rises small valve core 9a, and runner is just unlimited, has the fluid of tiny flow quantity to pass through.

Below the embodiment shown in has with reference to the accompanying drawings made detailed description to the present invention, but the present invention is not limited to these embodiments, is not breaking away under the spiritual prerequisite of the present invention, can also make all changes and diversified distortion.

Claims (6)

1. ball valve comprises:

A valve body forms a basic vertically fluid passage (20);

At least one valve seat is positioned at this fluid passage of described valve inner midway;

One spherical valve core (5) is used for collaborative valve seat, closes said fluid channel and the fluid flow of regulating this passage;

Be connected in the operation equipment of described spool, be used for the motion spool, when its direction in vertical run is moved, spool is moved at fluid flow direction, engage with valve seat, when its during in the motion of another direction, spool and valve seat are separated, described operation equipment comprises an operating stem (7), insert valve body, do vertical motion with relative runner, and comprise a connecting rod (9), the one end is loaded on the inner of operating stem swingably, the other end inserts the [that is arranged in spool, and it is characterized in that: the described ball valve core of √ (5) has a control valve intercommunicating pore (11), is positioned at spool (5) inside, and extend through in runner (20) direction substantially, and

When spool because flowing of fluid and in runner when mobile, the other end of connecting rod (9) can make connecting rod swing, so that spool and valve seat interoperation.

2. ball valve according to claim 1 is characterized in that, the front end of described operating stem (7) is provided with groove (8a), and an end of connecting rod (9) embeds in the groove (8a), and operating stem and connecting rod are fixed together by pin (8b).

3. ball valve according to claim 1 is characterized in that, an end of described connecting rod (9) has slotted hole (8f), and the pin (8b) that utilization can be moved in this slotted hole (8f) is fixed together described operating stem and connecting rod.

4. according to the described ball valve of one of claim 1-3, it is characterized in that the intercommunicating pore of described connection (11) comprises the valve seat (5a) of a moderate dimensions, it is positioned at intercommunicating pore (11) midway; The other end of described connecting rod (9) has the spool (9a) of a moderate dimensions, and itself and described valve seat (5a) are worked in coordination with, and turn-offs or regulate the fluid that flows in the intercommunicating pore (11).

5. ball valve according to claim 4, it is characterized in that, in described spool (9a), the little intercommunicating pore (9e) that intercommunicating pore (11a) that will be communicated with upstream side and the intercommunicating pore (11b) that is communicated with the downstream are communicated with is set, in the way of this little intercommunicating pore, be furnished with small valve seat (9d) and collaborative this small valve seat and make the flow partition of the streaming flow that passes through described little intercommunicating pore and/or the small spool (9c) that this flow is regulated, like this, make the pressure adjustment in stream upstream side and downstream side become multistage adjustment.

6. ball valve according to claim 4 is characterized in that, described spool (9a) has the biasing arrangement of being setovered by elastic material.

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