CN204880645U - Gas water heater - Google Patents

Abstract

The utility model discloses a gas water heater belongs to the water heater field, is difficult to realize the scheduling problem design for solving current device. The utility model discloses a gas water heater comprises a shell and a water pipe arranged in the shell, wherein a water flow server is arranged at the water inlet end of the water pipe, and the water flow server comprises a water flow sensor, a stepping motor and a water regulating valve core; when the water inflow changes, the water flow servo is used for adjusting the water inflow to a set value. The utility model discloses gas heater can keep the inflow stable, and then guarantees that water heater goes out the water temperature stability, and the operation is simple and easy, and is more accurate to going out water temperature control.

Description

Gas heater

Technical field

The utility model relates to field of water heaters, particularly relates to a kind of gas heater.

Background technology

Gas heater utilizes combustion gas to carry out heating water.In order to control leaving water temperature, need to ensure that inflow is stable, gas quantity is stablized.In routine use, because there is multiple tap in family, water heater place inflow can be caused when other tap discharges water to change, and then cause leaving water temperature to change greatly, poor user experience.

Existing a kind of gas heater, inlet pipeline is provided with steady flow compensator, ensures that inflow is more stable.Defect is: do not have corresponding water heater control method; Steady flow compensator is a upperseat concept, lacks concrete structure or components and parts title, is difficult to realize.

Utility model content

The purpose of this utility model proposes a kind of gas heater rational in infrastructure, easy to use.

For reaching this object, the utility model by the following technical solutions:

A kind of gas heater, comprise housing and be arranged on the water pipe in described housing, the water inlet end place of described water pipe is provided with current servomechanism, and described current servomechanism comprises water flow sensing unit, stepper motor and water transfer spool; When inflow changes, described current servomechanism is for adjusting inflow to setting value.

Particularly, described current servomechanism also comprises temperature sensor.

Particularly, described stepper motor is arranged on one end of described water transfer spool; Described water flow sensing unit is arranged on the water inlet end inwall of described water pipe, and described water transfer spool is arranged on the passage of described water pipe, by the flexible circulation area adjusting described water pipe of described water transfer spool.

Particularly, described housing is provided with alarm unit.

Further, described alarm unit is alarm lamp and/or emergency alarm bell.

Particularly, along water inlet direction in described water pipe, described water flow sensing unit is positioned at the front of described temperature sensor.

The utility model gas heater is provided with current servomechanism at the water inlet end place of water pipe, when inflow changes, current servomechanism can adjust inflow to setting value, inflow is kept to stablize, and then ensure that outlet water temperature of water heater is stablized, rational in infrastructure, easy to use, customer experience is good, easy to use, operate simple and easy, control more accurate to leaving water temperature.

Accompanying drawing explanation

Fig. 1 is the sectional view of the gas heater that the utility model preferred embodiment one provides;

Fig. 2 is the sectional view of the current servomechanism that the utility model preferred embodiment one provides;

Fig. 3 is the flow chart of the gas heater control method that the utility model preferred embodiment one provides;

Fig. 4 is the flow chart of the computational methods of the adjusted value L that the utility model preferred embodiment one provides.

Be labeled as in figure:

1, housing; 2, water pipe; 3, current servomechanism; 31, water flow sensing unit; 32, stepper motor; 33, water transfer spool; 34, temperature sensor.

Detailed description of the invention

The technical solution of the utility model is further illustrated by detailed description of the invention below in conjunction with accompanying drawing.

Preferred embodiment one:

This preferred embodiment discloses a kind of gas heater.As depicted in figs. 1 and 2, the water pipe 2 that this gas heater comprises housing 1 and is arranged in housing 1, the water inlet end place of water pipe 2 is provided with current servomechanism 3, and current servomechanism 3 comprises water flow sensing unit 31, stepper motor 32, water transfer spool 33 and temperature sensor 34.

Be provided with the current servomechanism 3 with monitoring and regulating pondage function at the water inlet end place of water pipe 2, ensure to adjust inflow in time when inflow changes, ensure that it maintains setting value all the time, realize the stable of inflow.

Stepper motor 32 is arranged on one end of water transfer spool 33; Water flow sensing unit 31 is arranged on the water inlet end inwall of water pipe 2, and water transfer spool 33 is arranged on the passage of water pipe 2, by the flexible circulation area adjusting water pipe 2 of water transfer spool 33.That is, block part water pipe 2 when water transfer spool 33 stretches out, discharge will diminish; When water transfer spool 33 is retracted, water pipe 2 is all unimpeded, and discharge will become large; Can also according to the extension elongation of real needs determination water transfer spool 33, to determine the circulation area (circulation) of water pipe 2.

Housing 1 is provided with alarm unit, and when inflow exceedes setting value but controller does not provide corresponding adjustment instruction alarm, reminding user manually adjusts.The concrete structure of alarm unit is not limit, and can be alarm lamp also can be emergency alarm bell, also can both have concurrently simultaneously.

Along water inlet direction in water pipe 2, water flow sensing unit 31 is positioned at the front of temperature sensor 34, ensures that measured water temperature numerical value is the temperature that flow obtains the current after controlling.

Control method based on this gas heater continues to detect inflow, utilize current servomechanism 3 compensation water flow, and gas valve synchronous adjustment is to ensure effluent temperature constancy when the numerical value of inflow departs from setting value.In order to realize this control method, need first to set up the corresponding relation between the step number S of stepper motor 32 and water flow variation ratio a%.

As shown in Figure 3, concrete, this control method comprises the steps:

Step 1, the step number S of stepper motor 32 to be made zero, detect initial inflow and water flow variation ratio a%.The stepping position B1 current according to the corresponding relation determination stepper motor 32 between the step number S of stepper motor 32 and water flow variation ratio a%.

Step 2, inflow being adjusted to 75% to 85% of initial inflow by current servomechanism 3, is the adjustment slot milling of the follow-up water yield.The percentage of adjustment can be determined as the case may be, is preferably 80%.

Step 3, real time record water flow variation ratio a1%.When inflow increases or reduce, current servomechanism 3 detects and records the flow value q1 before changing and the flow value q2 after changing; Controller calculates the water flow variation ratio a2% of required adjustment according to the flow value q1 before water flow variation ratio a1%, change and the flow value q2 after change:

$a2\%=\frac{q1}{q2}\×a1\%$

The stepping position B2 be adjusted to required for the corresponding relation determination stepper motor 32 between the step number S of stepper motor 32 and water flow variation ratio a%.

Step 4, stepper motor 32 are adjusted to stepping position B2, adjust gas quantity to desired value simultaneously, ensure that leaving water temperature changes within the scope of ± 1 DEG C.Go to step 3.

An a reference value and threshold value can be set in step 3 for inflow.When inflow is greater than a reference value but does not exceed threshold value, water flow variation ratio a1% be negative value (inflow minimizing) then controller without the need to doing any work, water flow variation ratio a1% be on the occasion of (inflow is increasing) then controller need to carry out the preparation of adjustment; When inflow is less than a reference value but does not exceed threshold value, water flow variation ratio a1% be negative value (inflow minimizing) then controller need to carry out the preparation of adjustment, water flow variation ratio a1% on the occasion of (inflow is increasing) then controller without the need to doing any work.

When gas quantity is in maximum supply status, leaving water temperature does not still reach setting value, and controller then calculates and adjusts inflow to adjusted value L by current servomechanism 3.As shown in Figure 4, concrete, the computational methods of adjusted value L comprise the steps:

Step S1, controller detect inflow temperature T1 according to temperature sensor 34.

Step S2, obtain the required discharge numerical value Qs reduced according to design temperature Ts and inflow temperature T1 inverse, computational methods are shown below,

$Qs=\frac{25\×V}{Ts-T1}$

Wherein, V is the specified heat production water yield of gas heater.

Step S3, the stepping position B3 be adjusted to required for the corresponding relation determination stepper motor 32 between the step number S of stepper motor 32 and water flow variation ratio a%.

Step S4, stepper motor 32 are adjusted to stepping position B3, adjust gas quantity to reach effluent temperature constancy simultaneously.

Preferred embodiment two:

This preferred embodiment discloses a kind of gas heater, and its structure and control method are all substantially identical with preferred embodiment one.This gas heater comprises housing and is arranged on the water pipe in housing, and the water inlet end place of water pipe is provided with current servomechanism; Current servomechanism comprises water flow sensing unit, stepper motor and water transfer spool; When inflow changes, current servomechanism is for adjusting inflow to setting value.Control method continues to detect inflow, utilize current servomechanism compensation water flow, and gas valve synchronous adjustment is to ensure effluent temperature constancy when the numerical value of inflow departs from setting value.

Difference is: current servomechanism does not comprise temperature sensor, can utilize the adjustment that water flow sensing unit and stepper motor realize inflow.The concrete steps of control method are not limit, and can utilize current servomechanism compensation water flow and coordinate gas valve synchronous adjustment to ensure effluent temperature constancy when the numerical value of inflow departs from setting value.

Note, the know-why that above are only preferred embodiment of the present utility model and use.Skilled person in the art will appreciate that the utility model is not limited to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and protection domain of the present utility model can not be departed from.Therefore, although be described in further detail the utility model by above embodiment, but the utility model is not limited only to above embodiment, when not departing from the utility model design, can also comprise other Equivalent embodiments more, and scope of the present utility model is determined by appended right.

Claims (6)

1. a gas heater, comprise housing (1) and be arranged on the water pipe (2) in described housing (1), it is characterized in that, the water inlet end place of described water pipe (2) is provided with current servomechanism (3), and described current servomechanism (3) comprises water flow sensing unit (31), stepper motor (32) and water transfer spool (33); When inflow changes, described current servomechanism (3) is for adjusting inflow to setting value.

2. gas heater according to claim 1, is characterized in that, described current servomechanism (3) also comprises temperature sensor (34).

3. gas heater according to claim 1 and 2, is characterized in that, described stepper motor (32) is arranged on one end of described water transfer spool (33); Described water flow sensing unit (31) is arranged on the water inlet end inwall of described water pipe (2), described water transfer spool (33) is arranged on the passage of described water pipe (2), by the flexible circulation area adjusting described water pipe (2) of described water transfer spool (33).

4. gas heater according to claim 1 and 2, is characterized in that, (1) is provided with alarm unit to described housing.

5. gas heater according to claim 4, is characterized in that, described alarm unit is alarm lamp and/or emergency alarm bell.

6. gas heater according to claim 2, is characterized in that, along water inlet direction in described water pipe (2), described water flow sensing unit (31) is positioned at the front of described temperature sensor (34).