CN2386271Y

CN2386271Y - Adjustable sluice valve

Info

Publication number: CN2386271Y
Application number: CN 99203656
Authority: CN
Inventors: 汪国士
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-02-23
Filing date: 1999-02-23
Publication date: 2000-07-05
Anticipated expiration: 2009-02-23

Abstract

The utility model relates to an adjustable sluice valve, which relates to heating and the technical field of processing the hydraulic misadjustment in the water supply network of a central air conditioner. The adjustable sluice valve is a redesigned hydraulic balance element according to the imperfect points of the original designed balance valve (the patent number of which is 88203650.5). The utility model is characterized in that a sluice valve structure is used as a design prototype, and the geometric shapes of a left and a right windows (8) of a valve seat are redesigned to form a flow capacity adjustable sluice valve. The adjustable sluice valve is better than a balance valve on the aspects of reducing the local resistance coefficient of valves, enlarging rated flow capacity, reducing shape, simplifying structure, reducing weight, etc. When the left and the right windows are designed into a rectangle, the adjustable sluice valve has an approximately rectilinear flow characteristic. When the left and the right windows are designed into a staircase shape with a large upper part and a small lower part, the adjustable sluice valve has an approximately equal percentage flow characteristic.

Description

Adjustable gate valve

The utility model relates to heating, handles hydraulic misadjustment in the central air-conditioner water supply network, prevents the field of the hydraulic equilibrium element of energy waste.

The Ministry of Construction issued " civil building energy-saving design standard " in 1996 (JGJ26-96) must install equilibrium valve in the water supply network of clear and definite hot water heating in standard ... and carry out hydraulic equilibrium and debug ... but the design of equilibrium valve (patent No. 88203650.5) exists a lot of perfect inadequately places.Too big as coefficient of partial resistance ξ, rated flow is too little, not corrosion-resistant, volume big, complex structure, and the field adjustable method is loaded down with trivial details ...With coefficient of partial resistance ξ is example, equilibrium valve (DN65-150) ξ=10～15 just mean also corresponding will the increase of circulating water lift of pump in the water supply network than much bigger this of Sweden TA product 4.7～5.6, not only wasting electric energy for a long time, and increasing the difficulty of the favourable loop hydraulic equilibrium debugging of water supply network and increase customer investment.From the rated flow of equilibrium valve, be example with the DN100 latus rectum: the rated flow of equilibrium valve is 116m only only ³/ h this than TA product 190m ³/ h is much smaller, and just meaning is when the unfavorable loop of water supply network place equilibrium valve moves under the low differential pressure condition, and its flow can not satisfy user's needs, will increase the circulating water pump lift equally and solve.Aspect corrosion-resistant, the spool seat material of end allusion quotation TA product adopts the patented product of research for many years, the Ametac alloy, and the spool seat material of equilibrium valve adopts stainless aluminium or stainless steel.And in fact, the corrosion-resistant indication that requires in the water supply network be not the corrosion of chemical action but the corrosion of the physical action that " flash distillation " " cavitation " that hot water occurs by valve contracted flow place forms.

The purpose of this utility model is all that improve part redesign inadequately and provide a kind of coefficient of partial resistance ξ low at equilibrium valve, rated flow is big, and minimizing is subjected to extent of corrosion, volume is little, in light weight, structure simple, a kind of easily water supply network hydraulic equilibrium element of debugging.

The utility model is achieved through the following technical solutions, selecting gate valve for use is prototype, the geometrical shape and the size of flow area have been redesigned, redesigned the shape of flashboard, and corresponding sealing configuration, driving mechanism, thus make the gate valve that can't regulate flow originally become the adjustable gate valve that can critically regulate flow.The shape that its main special card is a flashboard is rectangle, and valve seat left and right sides window has " rectangle " through hole, and this moment, adjustable gate valve had the near linear Flow characteristics.The utility model can come perfect with another kind of technological scheme, and promptly valve seat left and right sides window has when being shaped as up big and down small one-tenth " stepped shaft " through hole, and this moment, adjustable gate valve had approximate equal percentage flow characteristic.

Adjustable gate valve and the equilibrium valve implemented according to technological scheme compare, presented tangible beneficial effect, first round model machine of the present utility model (DN100) coefficient of partial resistance ξ=0.9447 rated flow that significantly is lower than equilibrium valve ξ=15 first round model machines is 130.95m ³/ h and the equilibrium valve of same latus rectum only is 116m ³/ h, third round model machine rated flow has reached 161.69m ³/ h still has the leeway of increase.

Because the utility model determines that be that prototype compares with gate valve with the stop valve as prototype and equilibrium valve:

The flange of gate valve is apart from the weight less than the favourable reduction valve body of stop valve.

The water (flow) direction of gate valve and flashboard transmission direction are 90 ° so only need overcome the positive pressure that faces current because of flashboard that current produce the positive pressure of flashboard, frictional force between the valve seat with regard to spool that can the transmission equilibrium valve, the also corresponding increase of required driving force, driving mechanism of the present utility model just can correspondingly dwindle from and can reduce weight, reduce volume, simplified structure.

" cavitation " process that produces " flash distillation " and appearance later on from corrosion mechanism equilibrium valve contracted flow all is just facing to spool, the degree of being corroded is very big, and the utility model water (flow) direction and flashboard be 90 ° of steam bubbles that occur because of " flash distillation " at the contracted flow place when occurring just by the current band from flashboard, after when " cavitation " process water follicular rupture and the intense impact that occurs from the flashboard scope, so the degree that flashboard is corroded is more much smaller than the spool of equilibrium valve.

First round model machine (DN100) be its volume of scyewed joint and same specification equilibrium valve more only its 1/5 and weight be its 1/4, making its volume and weight of flange coupling (owing to the NBS reason) into is to increase, but still has significantly reduction than equilibrium valve.

Fig. 1 is the schematic representation of equilibrium valve.

Fig. 2 is the schematic representation of adjustable gate valve.

Fig. 3 is the structural drawing of adjustable gate valve

Because of stop valve be as shown in Figure 1 (ξ=7～10) of coefficient of partial resistance maximum in the middle of all valve kind, could pass through valve seat after after current enter equilibrium valve, at first will being 90 ° through two sharp turns and the original flow direction, the current positive pressure just is being forced to the shunting that scatters facing to spool, contracted flow mouth between spool and the valve seat is owing to the actual internal area of water reduces to form local flow velocity increase suddenly, and local compression reduces because current are 90 ℃～115 ° hot water.Thereby generation " flash distillation " phenomenon, a large amount of steam bubbles produce, and folder is impacting spool with water droplet, the hot water flow path is crossed after the contracted flow mouth because the actual internal area sudden enlargement of water, current could flow out from equilibrium valve after being 90 ° of angles through two sharp turns again through interflow around the spool again, when in the middle of this process, revealing " cavitation " process water follicular rupture and being reduced into water, and the enormous impact that is produced, equally just facing to spool, so the spool valve seat can be subjected to serious physical impact and corrodes.The coefficient of partial resistance of whole valve with also because of during current are in valve several times sharp turn, shunting, interflow, dwindle suddenly, reason face such as sudden enlargement increases, coefficient of partial resistance increases naturally, the rated flow of valve is descended, found the situation that rated flow is too little during equilibrium valve development and design process, once wanting to increase the valve seat spool makes up, but because the structure of valve body is fixed, at all not have to increase possible and droping.

Adjustable as shown in Figure 2 gate valve is the gate valve that designs with the prototype of gate valve at coefficient of partial resistance in the middle of all valves is that it flows to constant only through dwindling two processes with sudden enlargement suddenly to the most minimum (ξ=0.5～1) current through adjustable gate valve the time, coefficient of partial resistance is more much smaller than equilibrium valve, rated flow also can increase much bigger, because coefficient of partial resistance is little, can reduce so the actual internal area of valve is also corresponding.The actual internal area of first round model machine DN100 is 25cm only only ²Its rated flow has surpassed the equilibrium valve of same specification, and the equilibrium valve actual internal area has reached 78.5cm ²There has not been the leeway that increases again.

It is by valve body (13) valve seat [parts that folder constitutes with liner plate (10) in the middle of the left and right sides window (8)] that the utility model embodiment provides (scyewed joint) main body by Fig. 3.Flashboard (9), valve rod (7) is formed, and left and right sides network for location (11) left and right sides non-return pressure figure (12) is used for to the support of valve seat, locatees and prevent and become flexible.Valve rod (7) and flashboard (9) are unified into body by pin, and valve rod (7) stretches out valve body (13) retainer (3) in and the connection of the internal thread of transmission shaft (1) through sealed letter (5) gland nut (4) in sealed letter seat (6).Two plane bearings (2) restrictions transmission shaft is play up and down when rotated, thereby valve rod (7) can be moved up and down together with flashboard (9), changes in the valve seat left and right sides window (8) actual internal area size to reach the adjustable purpose of flow.

Claims

1, a kind of adjustable gate valve comprises valve body, valve seat, flashboard, left and right sides positioning ring, sealing mechanism, driving mechanism etc., it is characterized in that the shape of described flashboard is rectangle, and valve seat left and right sides window has rectangular through-hole.

2, adjustable gate valve as claimed in claim 1 is characterized in that described valve seat, and left and right sides window has and is shaped as up big and down small stepped shaft through hole.