CN100394090C

CN100394090C - Pressure reducing valve for water storage type water heater

Info

Publication number: CN100394090C
Application number: CNB2005100856446A
Authority: CN
Inventors: 麦广海
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-24
Filing date: 2005-07-21
Publication date: 2008-06-11
Anticipated expiration: 2025-07-21
Also published as: CN1724911A

Abstract

The present invention relates to a stable and reliable pressure reducing valve for a water heater of a water storing type, which comprises a valve body, a valve core and a piston. The pressure reducing valve is characterized in that an expanding cavity is formed by an inner cavity of a valve body and a piston in a surrounding mode. A pressure spring is arranged between the piston and the valve body to apply inward spring force to the piston. A control rod with a tooth rack is fixed on the inner side of the piston. The tooth rack on the control rod is engaged with a gear of which one end is provided with a screw rod matched with a screw hole in the valve body and the other end is provided with a pushing post. The pushing post extends into a water inlet of the expanding cavity of which the water inlet is provided with a valve core with a rubber pad. The expanding cavity is provided with a water outlet.

Description

Pressure reducing valve for water storage type water heater

Technical field

The present inventor relates to a kind of reduction valve, particularly a kind of pressure reducing valve for water storage type water heater.

Background technique

Existing closed storage water heater, its water tank inlet connects running water pipe, water outlet picks out water valve, open the outlet valve that joins with water outlet during use, water in the effect lower header of tap water pressure sprays through outlet valve, close outlet valve after, the pressure with tap water is identical all the time for the pressure in the water tank, stainless steel water tank under the environment of High Temperature High Pressure very easily by corrosion, thereby shorten the life-span of water tank, and when hydraulic pressure was too high, water tank there was the danger of blast; So there is the problem that the life-span is short, Security is low in existing closed storage water heater.Among the disclosed Chinese patent bulletin CN2296438Y a kind of " multi-functional pressure internally piloted valve " disclosed on November 4th, 1998, it is actually a pressure reducing valve for water storage type water heater, its application target is to reduce water heater liner pressure in use, its principle is to lean on the gap length of piston control valve core and water intake to come balance pressure, because have seal ring on its piston, there is frictional force between piston and the body cavity, and stiction is generally greater than kinetic force of friction, so the active procedure of piston is not steady, motion under water pressure and spring force acting in conjunction is excessive easily, and the gap of spool and water intake is to the balance ten/sensitivity of pressure, so the decompression type internally piloted valve of this structure is steady inadequately to the control of hydraulic pressure, the stability of reduction valve and reliability are all lower.

Summary of the invention

Present inventor's purpose is stability and the low problem of reliability that exists in the existing pressure reducing valve for water storage type water heater in order to solve, and a kind of pressure reducing valve for water storage type water heater simple in structure, stable, reliable is provided.

Technological scheme:

The technological scheme that realizes present inventor's purpose is: a kind of pressure reducing valve for water storage type water heater comprises valve body, spool and piston; It is characterized in that piston is arranged in the body cavity, surround expansion chamber between body cavity and the piston, being provided with pressure spring between piston and the valve body makes piston be subjected to spring force to the expansion chamber direction, the piston inboard is fixed with the controlling rod of band tooth bar, tooth bar on the controlling rod and a gear engagement, this gear one end be with valve body in the screw screw rod, the other end that match be fore-set, this fore-set stretches to the water intake of expansion chamber, fore-set moves and can make spool open or close water intake, the water intake of expansion chamber is furnished with the spool of belt glue pad, and expansion chamber is provided with water outlet.The water intake of expansion chamber connects running water pipe, water outlet connects the water intake of water heater, during normality, because of the pressure in the expansion chamber increases, piston overcomes the effect of pressure spring and outwards moves, rack drives gear on the controlling rod rotates, because of the screw rod of gear and the screw on the valve body match, so driving fore-set when gear rotates moves vertically and controls spool the water intake of expansion chamber is closed, when the pressure in the expansion chamber descends, piston overcomes water pressure and moves inward under the effect of pressure spring, rack drives gear on the controlling rod moves in the other direction, thereby the control spool is opened the water intake of expansion chamber, invariablenes pressure of liquid in expansion chamber is in position that the suffered water pressure of piston and spring force balance each other, make the invariablenes pressure of liquid of expansion chamber, as long as the screw rod of gear is chosen less pitch, in the wheel and rack movement process, make the axial displacement of the axial displacement of fore-set much smaller than piston, just can reduce frictional force between piston and the body cavity to the influence of target constant pressure, thereby improve the stability and the reliability of reduction valve.Present inventor's essence is to convert piston mobile to fore-set move, thereby make the moving of moving of spool much smaller than piston, the control sensitivity of moving spool of piston is reduced, and expansion chamber water intake, spool and rubber cushion constitute a valve in fact, and this valve can replace with other valve of existing structure.

Described pressure reducing valve for water storage type water heater is characterized in that the fore-set of described spool and described gear is fixed, and described rubber cushion is arranged on the inboard of the water intake of expansion chamber.At this moment, piston overcomes the pressure spring effect under effect of water pressure outside when mobile, and the gear driven spool is near the water intake of expansion chamber.

Described pressure reducing valve for water storage type water heater is characterized in that the rubber cushion of described spool is arranged on the outside of the water intake of expansion chamber.At this moment, piston overcomes the pressure spring effect under effect of water pressure outside when mobile, and the gear driven fore-set is away from the water intake of expansion chamber, and spool is closed the water intake of expansion chamber voluntarily under the tap water pressure effect.

Described pressure reducing valve for water storage type water heater is characterized in that described valve body is provided with limiting stopper and limits the outermost position of piston with respect to valve body.At this moment, spool is as the outside of the water intake that is arranged on expansion chamber, it is for closed storage water heater, its advantage is as follows: when water heater rises to pressure in the water tank greater than tap water pressure because of the heating water temperature, water in the expansion chamber can back down spool the water pressure release in running water pipe that makes in the water tank, need not flow out and cause the waste and the pollution indoor environment of water resources through safety valve.

Owing to adopted the described technological scheme of present inventor, convert piston mobile to fore-set move, thereby make moving of spool, the control sensitivity of moving spool of piston is reduced, thereby improved the stability and the reliability of reduction valve much smaller than the moving of piston.

Description of drawings

Below in conjunction with drawings and Examples the present inventor is described further.

Fig. 1 is an embodiment's of the described pressure reducing valve for water storage type water heater of present inventor a structural representation.

Fig. 2 is the amplification profile of Fig. 1 along the A--A line.

Fig. 3 is another embodiment's an internal structure schematic representation.

Mark among the figure: 111, water outlet, 110, expansion chamber, 11, valve body, 121, controlling rod, 132, screw rod, 12, piston, 123, pressure spring, 124, guide pad, 125, intake pipe, B, drainage area, 13, gear, 131, fore-set, 112, screw, 114, support, 115, rubber cushion, 116, spool, 117, the spool guide pad.

Embodiment:

Embodiment one, in conjunction with Fig. 1 and Fig. 2 as seen, described pressure reducing valve for water storage type water heater, comprise valve body 11, spool 116 and piston 12, surround expansion chamber 110 between the inner chamber of valve body 11 and the piston 12, be provided with pressure spring 123 between piston 12 and the valve body 11, the piston inboard is fixed with the controlling rod 121 of band tooth bar, rack and pinion 13 on the controlling rod 121 is meshing, gear 13 lower ends be with valve body in the screw rod 132 that matches of screw 112, the upper end is fore-set 131 (Fig. 2), intake pipe 125 right-hand members connect pipe from the beginning, the other end is by being fixed on the support 114 on the valve body and communicating with expansion chamber 110 with the through hole of fixing rubber cushion 115 central authorities of support 114, the through hole of support 114 central authorities is the water intake of expansion chamber, spool 116 and rubber cushion 115 all are positioned at the water intake outside of expansion chamber, 117 pairs of spools 116 of spool guide pad play the guiding role, fore-set 131 is over against the water intake of expansion chamber, and expansion chamber 110 is provided with water outlet 111.Valve body 11 right-hand members are provided with drainage area B, when fore-set 131 with after spool separates, if the pressure in the expansion chamber is too high, then piston enters drainage area B, the water in the expansion chamber makes reduction valve play the effect of safety valve through the outside pressure release of drainage area B.Shown in Figure 1, when in the expansion chamber during drops, piston 12 moves to left, and moves on the fore-set 131, up to spool 116 (see figure 2)s top upwards, spool 116 is separated with rubber cushion 115, and the water in the intake pipe 125 can enter expansion chamber 110, otherwise piston moves to right; Certainly, rubber cushion 115 also can be fixing with spool 116.

If with B deletion in drainage area shown in Figure 1, and being set, limiting stopper limits piston 12 maximum position to the right on valve body 11, then when the pressure in the expansion chamber 110 during greater than the pressure in the intake pipe 125, water in the expansion chamber 110 makes the water pressure release in intake pipe 125 in the expansion chamber with spool 116 jack-up.Hot water when preventing that running water pipe from cutting off the water in the water heater flows backwards in running water pipe, then can between spool 116 and spool guide pad 117, add a spring, to set spool 116 to the pressure of opening from the water pipe direction, this is opened pressure and is set to 0.2 kilograms per square centimetres and gets final product (because the water heater highest point generally is no more than 2 meters to the height of reduction valve) generally speaking, pressure could be to the pressure release of running water pipe direction greater than running water pipe pressure 0.2 kilograms per square centimetres in water tank but have only this moment, this is that those skilled in the art is all attainable on the present inventor basis, does not do to state at this more.

Embodiment two, see Fig. 3, spool is fixedlyed connected with fore-set 1310, and is fixed on the inboard that rubber cushion 1150 on the spool is arranged on the water intake of expansion chamber, in addition, the hand of spiral of the screw in the valve body is opposite with embodiment's one, when piston outwards moves with respect to valve body (expansion chamber increase), gear drives rubber cushion 1150 by spool and moves down, otherwise, move on the rubber cushion, but the Fig. 1 in the relative position reference example one of its piston, valve body, controlling rod etc.

Claims

1. a pressure reducing valve for water storage type water heater comprises valve body, spool and piston; It is characterized in that piston is arranged in the body cavity, surround expansion chamber between body cavity and the piston, being provided with pressure spring between piston and the valve body makes piston be subjected to spring force to the expansion chamber direction, the piston inboard is fixed with the controlling rod of band tooth bar, tooth bar on the controlling rod and a gear engagement, this gear one end be with valve body in the screw screw rod, the other end that match be fore-set, this fore-set stretches to the water intake of expansion chamber, fore-set moves and can make spool open or close water intake, the water intake of expansion chamber is furnished with the spool of belt glue pad, and expansion chamber is provided with water outlet.

2. according to the described pressure reducing valve for water storage type water heater of claim 1, it is characterized in that the fore-set of described spool and described gear is fixed, described rubber cushion is arranged on the inboard of the water intake of expansion chamber.

3. according to the described pressure reducing valve for water storage type water heater of claim 1, it is characterized in that the rubber cushion of described spool is arranged on the outside of the water intake of expansion chamber.

4. according to the described pressure reducing valve for water storage type water heater of claim 3, it is characterized in that described valve body is provided with limiting stopper and limits the outermost position of piston with respect to valve body.