CN2548126Y

CN2548126Y - Anti-freezing water meter

Info

Publication number: CN2548126Y
Application number: CN 02234413
Authority: CN
Inventors: 陈道升; 刘本林; 王自力; 马以民; 周先伟; 王洪祥
Original assignee: Wanma Remote-Measuring Electronic Water-Meter Mfgco Ltd Yancheng City
Current assignee: Wanma Remote-Measuring Electronic Water-Meter Mfgco Ltd Yancheng City
Priority date: 2002-05-07
Filing date: 2002-05-07
Publication date: 2003-04-30
Anticipated expiration: 2012-05-07

Abstract

The formation reason of water meter freezing injury is about 9% volume expansion when water is solidified. The utility model provides a design to avoid freezing injury of water meter. The design is to additionally install a pressure limiting safety valve on meter body of the water meter. Certain water flows out from safety valve to avoid the formation of high pressure before the formation of freezing injury.

Description

A kind of Anti-freezing water meter

The utility model relates to a kind of novel Anti-freezing water meter.

Tap water relates to the important component part of huge numbers of families' city public construction, water meter is contact water-supplying unit and users' a measuring instrument, water meter and water are contacted directly, when temperature is reduced to subzero, common wet-type meter especially is installed in outdoor water meter and generally faces slurry freeze injury problem.For fear of freeze injury, some patents such as ZL9615215.3, ZL97238840.0 have proposed the new water meter design that structure has material alterations.Generally speaking, these new construction water meters are faced with many difficulties in development, typing.More people for example ZL98204797.5 etc. has proposed principle and has not changed water meter structure, installs the antifreeze scheme of water meter protective sleeve, protective cover additional.The heat-proof quality of the material of protective sleeve, protective cover generally can reach the heat-proof quality good horizontal through people's meticulous selection.But however, the antifreezing effect of this scheme is unsatisfactory: when temperature is reduced to about-5, when tap water froze, the glass surface of common wet-type meter still can be frozen brokenly.Along with carrying out that in recent years " reading the ammeter directly " works, will have more water meter and be installed in the open air, the freeze injury of prevention water meter is a more urgent problem.

The purpose of this utility model be to propose a kind of can be than under the cool condition, utilize the novel frost damage prevention water meter of himself protective device.

The water meter freeze injury forms fundamental cause and is that water has the volumetric expansion about 9% when solidifying.For the water meter that installs anti-freezing cover additional; the freeze injury of water meter is to form like this: the water inlet pipe and water outlet pipe of water meter is at first icing owing to lack thermal insulation protection; thereby the turnover water channel is stopped up; along with icing face along pipeline to the water meter in-house development; because hydraulic pressure raises in the volumetric expansion of freezing and causing, water gauge body, when the pressure of water meter inside reaches sufficiently high; the parts that strength ratio is lower in the water meter (generally being the watch crystal of water meter) will at first break, and form freeze injury.If can limit the pressure of water meter inside this moment, the serious freeze injury that causes water gage glass to break just can be avoided.

According to above-mentioned analysis, the design that prevents the water meter freeze injury that the utility model proposes is after on the water meter thermal insulation protection cover being installed, and installs a pressure-limiting safety valve on water meter additional.Before freeze injury forms, from this safety valve, discharge some water, thereby prevent the formation of high pressure.

Pressure-limiting safety valve can (for example by being threaded) on the housing of water meter, also can be on the face glass of water meter.

In order to prevent the corrosion in the pressure-limiting safety valve, in the spring housing of safety valve, be full of lubricating oil.

Fig. 1 is the structural representation of Anti-freezing water meter;

Fig. 2 is the structural representation of Anti-freezing water meter pressure-limiting safety valve.

With Fig. 1 and Fig. 2 is example, and Anti-freezing water meter comprises one group of stay-warm case (1) and (3), pressure-limiting safety valve (2) and water meter (4).Pressure-limiting safety valve is by valve body (5), and spool (8) is formed with set screw (6).Pressure-limiting safety valve should be arranged in the top of water meter, to avoid the water channel of the sediment obstruction pressure-limiting safety valve in the water.After the pressure in the water meter rose to predetermined value, water under high pressure promptly backed down spool, and discharged water from weep hole, the further rising of restriction hydraulic pressure.Thereby finish defencive function.Rotate set screw, can adjust the compression degree of spring, promptly can regulate the protection action pressure of pressure-limiting safety valve.

Claims

1. water meter with pre-frost damage prevention function is characterized in that installing on the shell of water meter and has the pressure-limiting safety valve of weep hole, and has installed and the supporting stay-warm case of water meter shape.

2. according to claim 1, pressure-limiting safety valve is made up of spool, pressure limiting spring and adjusting screw, and adjusting screw can realize the pressure adjusting of safety valve.

3. according to claim 1, in the spring cabin, fill lubricating oil.