CN107631341B - Expansion type constant temperature hot water system - Google Patents
Expansion type constant temperature hot water system Download PDFInfo
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- CN107631341B CN107631341B CN201710943675.3A CN201710943675A CN107631341B CN 107631341 B CN107631341 B CN 107631341B CN 201710943675 A CN201710943675 A CN 201710943675A CN 107631341 B CN107631341 B CN 107631341B
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Abstract
The invention discloses an expansion type constant temperature hot water system, which comprises a gas boiler, a water supply main pipe and a water return main pipe, wherein the water return main pipe is connected with an expansion water tank, the expansion water tank is connected with a water supplementing pipe, the water supplementing pipe is connected with a water supplementing pump, the water supplementing pump is connected with a water supplementing tank, the water supplementing tank is connected with a water softener, and the water softener is connected with a municipal tap water pipe network; a circulating pump is arranged on a backwater main pipe at the inlet of the gas boiler; the tail end of the water supply main pipe is connected with a water distribution tank, and the tail end of the water return main pipe is connected with a water collection tank; the gas boiler is connected with a gas inlet pipe, a first gas branch pipe and a second gas branch pipe are connected in parallel on the gas inlet pipe, and a hot water thermostatic valve of the gas boiler is connected in series on the second gas branch pipe. The invention can be enabled to play a role by only closing the first gas valve and opening the second gas valve, and the heat generation amount of the boiler is regulated by regulating the air inflow of the gas boiler, so that the constant temperature regulation is realized, and the water outlet temperature of the gas boiler is controlled within a preset range.
Description
Technical Field
The invention relates to the technical field of heat supply of gas boilers, in particular to a constant-temperature hot water supply system of a gas boiler.
Background
With the development of economy and society, the living standard of people is increasingly improved, central heating full coverage is basically realized in northeast areas, but in the middle area of China, the temperature is lower in winter, the central heating coverage is smaller, and a plurality of communities are not connected with thermal power companies. Therefore, in the middle area of China, a plurality of communities are provided with heating systems. The pollution of the coal-fired boiler is large and has been phased out; the gas boiler uses gas (such as natural gas, liquefied petroleum gas and the like) as fuel, and heats water through the burner, thereby realizing heating and providing hot water for life and bath, and the gas boiler is quick in heating, low in noise and free of dust, is an economic boiler variety very suitable for Chinese conditions, and is increasingly widely applied, thereby providing hot water for heating for more and more heat utilization units.
The intelligent gas boiler has high automation degree, and the temperature of the water outlet is monitored and controlled by a temperature sensor, an electric control device (a microcomputer controller) and a burner. The intelligent gas boiler has higher cost, complex mechanism and large influence on normal heat of a heat utilization unit in the later use process once any link in the complex temperature monitoring control mechanism is problematic, the water outlet temperature cannot be well controlled, and particularly the maintenance process needs longer time. Of course, the maintenance cost of the intelligent gas boiler is also high.
Disclosure of Invention
The invention aims to provide an expansion type constant-temperature hot water system for realizing constant-temperature water supply when a temperature monitoring control mechanism of a gas boiler fails.
In order to achieve the purpose, the expansion type constant temperature hot water system comprises a gas boiler, a water supply main pipe and a water return main pipe, wherein a water inlet of the gas boiler is connected with the water return main pipe, and a water outlet of the gas boiler is connected with the water supply main pipe; the water return main pipe is connected with an expansion water tank, the expansion water tank is connected with a water supplementing pipe, the water supplementing pipe is connected with a water supplementing pump, the water supplementing pump is connected with a water supplementing tank, the water supplementing tank is connected with a water softener, and the water softener is connected with a municipal tap water pipe network; a circulating pump is arranged on a backwater main pipe at the inlet of the gas boiler;
the end of the water supply main pipe, which is connected with the gas boiler, is the starting end of the water supply main pipe, the tail end of the water supply main pipe is connected with a water distribution box, the water distribution box is connected with a plurality of water supply branch pipes, each water supply branch pipe is respectively provided with a water distribution valve, each water supply branch pipe is connected with a hot water inlet pipe of a heat utilization unit, and the expansion water tank is positioned at the topmost layer of the highest heat utilization unit;
the end of the water return main pipe, which is connected with the gas boiler, is the starting end of the water return main pipe, and the tail end of the water return main pipe is connected with a water collecting tank; the water collecting tank is connected with a plurality of water return branch pipes, each water return branch pipe is respectively provided with a water return valve, and each water return branch pipe is connected with a hot water outlet pipe of a heat utilization unit;
the gas boiler is connected with a gas inlet pipe, a first gas branch pipe and a second gas branch pipe are connected in parallel on the gas inlet pipe, a first gas valve is arranged on the first gas branch pipe, and a second gas valve and a hot water thermostatic valve of the gas boiler are connected in series on the second gas branch pipe; a hot water cylinder is connected in series on a water supply main pipe at the outlet of the gas boiler, and the inner diameter of the hot water cylinder is larger than that of the water supply main pipe;
the hot water thermostatic valve of the gas boiler comprises a valve body, wherein a vertically arranged inner cavity is arranged in the valve body, the horizontal section of the inner cavity is circular, the side wall of the inner cavity is slidably connected with a valve core, the valve core comprises a top block, a bottom block and a connecting column connected between the top block and the bottom block, and the top block and the bottom block are respectively in sliding sealing fit with the side wall of the inner cavity; the top block, the bottom block, the connecting column and the side wall of the inner cavity enclose an annular cavity; an air outlet hole is arranged in the valve body at one side, the inner end of the air outlet hole is communicated with the inner cavity of the valve body, the outer end of the air outlet hole is connected with an air outlet pipe, an air inlet hole is arranged in the valve body at the opposite side of the air outlet hole, the inner end of the air inlet hole is communicated with the inner cavity of the valve body, and the outer end of the air inlet hole is connected with an air inlet pipe;
the top end of the top block and the inner cavity of the valve body a pressure spring is connected between the top walls; the bottom block is pressed downwards and connected with a push rod, the diameter of the upper part of the push rod is larger than that of the lower part of the push rod, the upper part of the push rod penetrates through the valve body and stretches into the inner cavity of the valve body, the upper part of the push rod is in sliding sealing fit with the valve body, and the top end of the push rod is in pressing fit with the bottom block; a fixed seat is arranged below the valve body, a vertical through hole is arranged in the fixed seat, and the lower part of the push rod downwards extends into the vertical through hole and is in sliding sealing fit with the hole wall of the vertical through hole; the lower end opening of the vertical through hole is connected with an expansion pipe, the expansion pipe is connected with a temperature sensing box, and expansion liquid is contained in the temperature sensing box; the temperature sensing box is arranged in the hot water cylinder;
the valve core is provided with an upper limit position and a lower limit position, and the air outlet hole is always communicated with the annular cavity when the valve core is positioned between the upper limit position and the lower limit position; the air inlet hole is isolated from the annular cavity when the valve core is positioned at the upper limit position, the valve core is positioned at the initial position of the valve core when the valve core is positioned at the lower limit position, and the air inlet hole is completely communicated with the annular cavity when the valve core is positioned at the initial position; the valve core is provided with a balance position, the balance position of the valve core is positioned between an upper limit position and a lower limit position, when the valve core is positioned at the balance position, the top end of the annular cavity is higher than the top end of the air inlet hole, the bottom end of the annular cavity is lower than the top end of the air inlet hole, and the annular cavity and the air inlet hole are in a partial communication state; the height of the annular cavity is equal to the height of the air inlet hole; the hot water thermostatic valve of the gas boiler is connected in series with the second gas branch pipe through the gas outlet pipe and the gas inlet pipe.
More than two sets of gas boilers are connected in parallel between the water supply main pipe and the water return main pipe; more than two sets of circulating pumps are connected in parallel.
The plate heat exchanger comprises a first inlet, a second inlet, a first outlet and a second outlet, wherein the first inlet and the first outlet are connected in series on a water supply main pipe, and the second inlet and the second outlet are connected in series on a water return main pipe; and a flow balance valve is arranged on the pipeline at the first outlet.
More than two sets of plate heat exchangers are connected in parallel.
The bottom end of the water diversion tank and the bottom end of the water collection tank are respectively connected with a water drain valve.
A bypass pipe is connected between the water diversion tank and the water collection tank, and a differential pressure bypass valve is arranged on the bypass pipe.
An upper locating ring is arranged on the side wall of the inner cavity at the upper limit position of the valve core, and a lower locating ring is arranged on the side wall of the inner cavity at the lower limit position of the valve core.
When the temperature monitoring control mechanism of the gas boiler fails, the hot water thermostatic valve of the gas boiler can be enabled to play a role only by closing the first gas valve and opening the second gas valve, the heat generation amount of the boiler is regulated by regulating the air inflow of the gas boiler, and then the thermostatic regulation is realized, and the water outlet temperature of the gas boiler is controlled within a preset range. Compared with the prior method of shutdown maintenance (1-3 days are needed), the influence on users is minimized.
In the heating season, the workload of factory maintenance personnel is larger, and the fitting cost and the labor cost are higher than those in the non-heating season. By using the structure of the invention, the shutdown time can be shortened, and the maintenance time of the gas boiler can be adjusted to be in a non-heating season, thereby saving the maintenance cost.
The gas boiler hot water thermostatic valve can utilize the characteristic that the expansion liquid changes in volume along with the temperature change, and combines the elasticity of the spring to enable the valve core to move downwards when the outlet water temperature of the gas boiler is higher, so that the air inflow is increased, the heat production capacity of the gas boiler is improved, and the outlet water temperature is improved; when the outlet water temperature of the gas boiler is lower, the valve core moves upwards, and the air inflow is reduced, so that the heat production quantity of the gas boiler is reduced, and the outlet water temperature is reduced.
The gas boiler hot water thermostatic valve is realized without an electric control system, a temperature sensor is not required to be arranged, the water temperature is compared with a set value and judged by the electric control device, and compared with an electric control structure, the pure mechanical structure is simpler, is not easy to fail, greatly reduces the equipment maintenance cost, and can rapidly play a role when the temperature monitoring control mechanism of the gas boiler fails.
The control process is simple and convenient, operators do not need special training, and the constant temperature control of the water outlet temperature of the gas boiler can be realized through the operation of simply opening and closing the valve.
The opening degree of the regulating valve is controlled, so that the high and low positions of the valve core balance position can be conveniently controlled, and the water outlet temperature (namely the set water outlet temperature) of the gas boiler in a stable state is further controlled.
The expansion water tank is positioned at the top layer of the heat utilization unit, so that stable and enough water pressure in the system is ensured, and a large amount of air is prevented from entering the circulating water system.
The differential pressure bypass valve can balance the differential pressure between the water supply and the water return, can improve the utilization rate of the system, maintain the accurate mutual fixed value of the differential pressure, can reduce the noise of the system, and avoid the damage to equipment caused by the overlarge differential pressure between the water supply and the water return. The operator can adjust the opening degree according to the heat load condition of the heat consumption unit, and when the heat load condition is very small or zero, a certain amount of water in the gas boiler can pass through, so that the gas boiler is protected, and the effects of energy conservation and consumption reduction are also achieved.
The plate heat exchanger can control the temperature difference of the supplied backwater within a preset range, thereby achieving the purpose of energy conservation. The flow balance valve can directly set flow according to design, and the valve can automatically eliminate flow deviation caused by residual pressure head and pressure fluctuation of a pipeline under the action of water, so that the set flow can be kept unchanged no matter how the system pressure changes. The flow regulation of the pipe network is completed once, the network regulation work is changed into simple flow distribution, and the problem of imbalance of hydraulic balance of the pipe network is effectively solved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of a hot water thermostatic valve of a gas boiler with a valve core in an equilibrium position;
FIG. 3 is a schematic structural view of a hot water thermostatic valve of a gas boiler with a valve core at a lower limit position;
FIG. 4 is a schematic structural view of a hot water thermostatic valve of a gas boiler with a valve core at an upper limit position.
Detailed Description
As shown in fig. 1 to 4, the invention discloses an expansion type constant temperature hot water system, which comprises a gas boiler 1, a water supply main pipe 2 and a water return main pipe 3, wherein a water inlet of the gas boiler 1 is connected with the water return main pipe 3, and a water outlet of the gas boiler 1 is connected with the water supply main pipe 2; the water return main pipe 3 is connected with an expansion water tank 4, the expansion water tank 4 is connected with a water supplementing pipe 5, the water supplementing pipe 5 is connected with a water supplementing pump 6, the water supplementing pump 6 is connected with a water supplementing tank 7, the water supplementing tank 7 is connected with a water softener 8, and the water softener 8 is connected with a municipal tap water pipe network; a circulating pump 9 is arranged on the water return main pipe 3 at the inlet of the gas boiler 1;
the water supply main pipe 2 is connected with the gas boiler 1 by taking the end connected with the gas boiler 1 as the initial end, the tail end of the water supply main pipe 2 is connected with a water diversion box 10, the water diversion box 10 is connected with a plurality of water supply branch pipes 11, each water supply branch pipe 11 is respectively provided with a water diversion valve 12, each water supply branch pipe 11 is connected with a hot water inlet pipe of a heat utilization unit, and the expansion water tank 4 is positioned at the topmost layer of the highest heat utilization unit;
the end of the water return main pipe 3 connected with the gas boiler 1 is the initial end of the water return main pipe, and the tail end of the water return main pipe 3 is connected with a water collecting tank 13; the water collecting tank 13 is connected with a plurality of water return branch pipes 14, each water return branch pipe 14 is provided with a water return valve 15, and each water return branch pipe 14 is connected with a hot water outlet pipe of a heat utilization unit; the heat utilization unit, the hot water inlet pipe and the hot water outlet pipe are all conventional technologies and are not shown in the figure.
The gas boiler 1 is connected with a gas inlet pipe 16, a first gas branch pipe 17 and a second gas branch pipe 18 are connected in parallel on the gas inlet pipe 16, a first gas valve 19 is arranged on the first gas branch pipe 17, and a second gas valve 20 and a gas boiler hot water thermostatic valve 21 are connected in series on the second gas branch pipe 18; the water supply main pipe 2 at the outlet of the gas boiler 1 is connected with a hot water cylinder 22 in series, and the inner diameter of the hot water cylinder 22 is larger than that of the water supply main pipe 2;
the hot water thermostatic valve 21 of the gas boiler comprises a valve body 23, wherein a vertically arranged inner cavity 24 is arranged in the valve body 23, the horizontal section of the inner cavity 24 is circular, the side wall of the inner cavity 24 is slidably connected with a valve core, the valve core comprises a top block 25, a bottom block 26 and a connecting column 27 connected between the top block 25 and the bottom block 26, and the top block 25 and the bottom block 26 are respectively in sliding sealing fit with the side wall of the inner cavity 24; the side walls of the top block 25, the bottom block 26, the connecting column 27 and the inner cavity 24 enclose an annular cavity 28; an air outlet hole 29 is formed in the valve body 23 on one side, the inner end of the air outlet hole 29 is communicated with the inner cavity 24 of the valve body 23, the outer end of the air outlet hole is connected with an air outlet pipe 30, an air inlet hole 31 is formed in the valve body 23 on the opposite side of the air outlet hole 29, the inner end of the air inlet hole 31 is communicated with the inner cavity 24 of the valve body 23, and the outer end of the air inlet hole 31 is connected with an air inlet pipe 32;
a pressure spring 33 is connected between the top end of the top block 25 and the top wall of the inner cavity 24 of the valve body 23; the bottom block 26 is pressed downwards and connected with a push rod 34, the diameter of the upper part of the push rod 34 is larger than that of the lower part, the upper part of the push rod 34 passes through the valve body 23 and stretches into the inner cavity 24 of the valve body 23, the upper part of the push rod 34 is matched with the valve body 23 in a sliding sealing way, and the top end of the push rod 34 is matched with the bottom block 26 in a pressing way; a fixed seat 35 is arranged below the valve body 23, a vertical through hole is arranged in the fixed seat 35, and the lower part of the push rod 34 downwards extends into the vertical through hole and is in sliding sealing fit with the hole wall of the vertical through hole; the lower end opening of the vertical through hole is connected with an expansion pipe 36, the expansion pipe 36 is connected with a temperature sensing box 37, and expansion liquid 38 is contained in the temperature sensing box 37; the temperature sensing box 37 is installed in the hot water drum 22; in operation, the expansion pipe 36 and the vertical through holes are filled with an expansion fluid 38.
The valve core has an upper limit position and a lower limit position, and the air outlet hole 29 is always communicated with the annular cavity 28 when the valve core is positioned between the upper limit position and the lower limit position; the air inlet hole 31 is isolated from the annular cavity 28 when the valve core is positioned at the upper limit position, the valve core is positioned at the initial position when the valve core is positioned at the lower limit position, and the air inlet hole 31 is completely communicated with the annular cavity 28 when the valve core is positioned at the initial position; the valve core has a balance position, the balance position of the valve core is positioned between an upper limit position and a lower limit position, when the valve core is positioned at the balance position, the top end of the annular cavity 28 is higher than the top end of the air inlet hole 31, the bottom end of the annular cavity 28 is lower than the top end of the air inlet hole 31, and the annular cavity 28 and the air inlet hole 31 are in a partial communication state; the height of the annular cavity 28 is equal to the height of the air inlet hole 31;
the gas boiler hot water thermostatic valve 21 is connected in series to the second gas branch pipe 18 through its outlet pipe 30 and inlet pipe 32.
More than two sets of gas boilers 1 are connected in parallel between a water supply main pipe 2 and a water return main pipe 3; thereby increasing the heating capacity of the system and increasing the heating service area.
More than two sets of circulating pumps 9 are connected in parallel; thereby increasing the water supply flow rate and improving the ability to stably supply water to higher floors.
The expansion type constant temperature hot water system also comprises a plate heat exchanger 42, wherein the plate heat exchanger 42 comprises a first inlet 43, a second inlet 44, a first outlet 45 and a second outlet 46, the first inlet 43 and the first outlet 45 are connected in series on the water supply main 2, and the second inlet 44 and the second outlet 46 are connected in series on the water return main 3; a flow balancing valve 47 is provided in the line at the first outlet 45.
The plate heat exchanger 42 can control the temperature difference of the supplied and returned water within a predetermined range, thereby achieving the purpose of energy saving. The flow balance valve 47 can directly set the flow according to the design, and the valve can automatically eliminate the flow deviation caused by the residual pressure head and pressure fluctuation of the pipeline under the action of water, so that the set flow can be kept unchanged no matter how the system pressure changes. The flow regulation of the pipe network is completed once, the network regulation work is changed into simple flow distribution, and the problem of imbalance of hydraulic balance of the pipe network is effectively solved.
The plate heat exchangers 42 are connected in parallel with more than two sets, so that the heat exchange capacity is increased, and the temperature difference of the supplied backwater is reduced.
The bottom end of the water diversion tank 10 and the bottom end of the water collection tank 13 are respectively connected with a water drain valve 48.
A bypass pipe 49 is connected between the water diversion tank 10 and the water collection tank 13, and a differential pressure bypass valve 50 is arranged on the bypass pipe 49. The differential pressure bypass valve 50 can balance the differential pressure between the water supply and the water return, can improve the utilization rate of the system, maintain the accurate mutual fixed value of the differential pressure, can reduce the noise of the system, and avoid the damage to equipment caused by the overlarge differential pressure between the water supply and the water return. The operator can adjust the opening degree according to the heat load condition of the heat consumption unit, and when the heat load condition is very small or zero, a certain amount of water in the gas boiler 1 can be ensured to pass through, so that the gas boiler 1 is protected, and the effects of energy conservation and consumption reduction are also achieved.
The side wall of the inner cavity 24 at the upper limit position of the valve core is provided with an upper positioning ring 51, and the side wall of the inner cavity 24 at the lower limit position of the valve core is provided with a lower positioning ring 52. The upper and lower retaining rings 51 and 52 can define the upper and lower limit positions of the spool.
The temperature sensing box 37 is connected with an adjusting pipe 39, the adjusting pipe 39 is connected with an adjusting box 40, and an adjusting valve 41 is arranged on the adjusting pipe 39.
The expansion fluid 38 is mercury or ethanol. Mercury and ethanol have larger expansion coefficients, and the volume change of the mercury and the ethanol is larger along with the change of temperature, so that the production pressure is changed, and the valve core has relatively larger stroke.
An upper sealing ring 53 is arranged on the upper surface of the fixed seat 35 around the push rod 34, and a lower sealing ring 54 is arranged on the lower surface of the fixed seat 35 around the expansion pipe 36. Thereby enhancing the sealing performance at the two positions.
The invention also provides a constant temperature operation method of the expansion type constant temperature hot water system, which comprises the following steps:
firstly, in the normal operation process, the water diversion valves 12, the water return valve 15 and the first gas valve 19 are opened, the second gas valve 20 and the regulating valve 41 are closed, and the gas is supplied to the gas boiler 1 after passing through the first gas valve 19, the first gas branch pipe 17 and the gas inlet pipe 16; starting the gas boiler 1 and the circulating pump 9, heating circulating water in the gas boiler 1, and enabling heated hot water to enter the water supply main pipe 2; at the same time, backwater enters the backwater main pipe 3 after passing through the hot water outlet pipe of each heat utilization unit, each backwater branch pipe 14 and the water collecting tank 13; the hot water exchanges heat with the backwater when passing through the plate heat exchanger 42, and the backwater is preheated and the temperature difference of the backwater is controlled within a preset range; hot water enters the water diversion box 10 through the water supply header pipe 2 after passing through the plate heat exchanger 42, and is supplied to each heat utilization unit through each water supply branch pipe 11 and the hot water inlet pipe of each heat utilization unit; the backwater enters the gas boiler 1 through the circulating pump 9 and the backwater main pipe 3 after passing through the plate heat exchanger 42, so as to form a complete waterway circulation; the expansion tank 4 ensures stable pressure in the system, and when the water level in the expansion tank 4 is reduced, the water softener 8 and the water supplementing pump 6 are started, and water is supplemented into the expansion tank 4 until the expansion tank 4 is fully filled with water;
when the temperature monitoring control mechanism of the gas boiler 1 fails, the second gas valve 20 is immediately opened, the first gas valve 19 is closed, and gas is supplied to the gas boiler 1 through the gas boiler hot water thermostatic valve 21, so that the system is kept to continue to operate;
the downward pushing force of the spring and the dead weight of the valve core form lower pressure on the valve core, the upward pushing force of the expansion liquid 38 forms upper pressure, and the valve core is positioned at the balance position when the valve core works normally, so that the upper pressure and the lower pressure reach the balance state;
when the water outlet temperature of the gas boiler 1 exceeds the normal range, the volume of the expansion liquid 38 in the temperature sensing box 37 is increased, and then the upper pressure is increased to push the push rod 34 and the valve core to leave the balance position upwards, so that the communication area between the annular cavity 28 and the air inlet hole 31 is reduced, and the air inflow of the gas boiler 1 is reduced; the higher the water outlet temperature of the gas boiler 1 is, the larger the volume increment of the expansion liquid 38 is, when the water outlet temperature of the gas boiler 1 exceeds the set upper limit temperature, the valve core reaches the upper limit position, and the air inlet hole 31 is isolated from the annular cavity 28, so that the gas supply to the gas boiler 1 is stopped; after the air inflow of the gas boiler 1 is reduced or interrupted, the water outlet temperature of the gas boiler 1 is gradually reduced, and after the volume of the expansion liquid 38 in the temperature sensing box 37 is reduced, the valve core moves downwards under the elastic force of the pressure spring 33 until the valve core reaches the balance position;
when the water outlet temperature of the gas boiler 1 is lower than the normal range, the volume of the expansion liquid 38 in the temperature sensing box 37 is reduced, the upper pressure is reduced, and under the action of the elastic force of the pressure spring 33, the valve core is downward separated from the balance position, so that the communication area between the annular cavity 28 and the air inlet hole 31 is enlarged, the air inflow of the gas boiler 1 is increased, when the water outlet temperature of the gas boiler 1 is lower than the set lower limit temperature, the valve core reaches the lower limit position, and the communication area between the air inlet hole 31 and the annular cavity 28 is maximized; after the air inflow of the gas boiler 1 is increased, the water outlet temperature of the gas boiler 1 is gradually increased, and after the volume of the expansion liquid 38 in the temperature sensing box 37 is increased, the valve core moves upwards under the elastic force of the pressure spring 33 until the valve core reaches the balance position; when the valve core is stabilized at the balance position, the water outlet temperature of the gas boiler 1 is kept at a preset water outlet temperature.
When the preset outlet water temperature of the gas boiler 1 needs to be regulated up, the regulating valve 41 is opened;
the larger the opening degree of the regulating valve 41 is, the more the expansion liquid 38 enters the regulating box 40, the less the expansion liquid 38 enters the vertical through hole in the fixed seat 35 at the same water outlet temperature of the gas boiler 1, the lower the upper pressure of the expansion liquid 38 on the push rod 34 is, and the lower the balance position of the corresponding valve core is; therefore, the larger the opening degree of the regulating valve 41 is, the larger the communication area between the annular cavity 28 and the air inlet hole 31 is when the valve core is positioned at the balance position, and the higher the heat generation amount of the gas boiler 1 and the water outlet temperature of the gas boiler 1 are correspondingly;
the opening degree of the regulating valve 41 is controlled so as to control the water outlet temperature of the gas boiler 1, and when the water outlet temperature of the gas boiler 1 needs to be increased, the opening degree of the regulating valve 41 is increased; when the outlet water temperature of the gas boiler 1 needs to be lowered, the opening degree of the regulating valve 41 is reduced.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (5)
1. The expansion type constant temperature hot water system is characterized in that: the water supply system comprises a gas boiler, a water supply main pipe and a water return main pipe, wherein a water inlet of the gas boiler is connected with the water return main pipe, and a water outlet of the gas boiler is connected with the water supply main pipe; the water return main pipe is connected with an expansion water tank, the expansion water tank is connected with a water supplementing pipe, the water supplementing pipe is connected with a water supplementing pump, the water supplementing pump is connected with a water supplementing tank, the water supplementing tank is connected with a water softener, and the water softener is connected with a municipal tap water pipe network; a circulating pump is arranged on a backwater main pipe at the inlet of the gas boiler;
the end of the water supply main pipe, which is connected with the gas boiler, is the starting end of the water supply main pipe, the tail end of the water supply main pipe is connected with a water distribution box, the water distribution box is connected with a plurality of water supply branch pipes, each water supply branch pipe is respectively provided with a water distribution valve, each water supply branch pipe is connected with a hot water inlet pipe of a heat utilization unit, and the expansion water tank is positioned at the topmost layer of the highest heat utilization unit;
the end of the water return main pipe, which is connected with the gas boiler, is the starting end of the water return main pipe, and the tail end of the water return main pipe is connected with a water collecting tank; the water collecting tank is connected with a plurality of water return branch pipes, each water return branch pipe is respectively provided with a water return valve, and each water return branch pipe is connected with a hot water outlet pipe of a heat utilization unit;
the gas boiler is connected with a gas inlet pipe, a first gas branch pipe and a second gas branch pipe are connected in parallel on the gas inlet pipe, a first gas valve is arranged on the first gas branch pipe, and a second gas valve and a hot water thermostatic valve of the gas boiler are connected in series on the second gas branch pipe; a hot water cylinder is connected in series on a water supply main pipe at the outlet of the gas boiler, and the inner diameter of the hot water cylinder is larger than that of the water supply main pipe;
the hot water thermostatic valve of the gas boiler comprises a valve body, wherein a vertically arranged inner cavity is arranged in the valve body, the horizontal section of the inner cavity is circular, the side wall of the inner cavity is slidably connected with a valve core, the valve core comprises a top block, a bottom block and a connecting column connected between the top block and the bottom block, and the top block and the bottom block are respectively in sliding sealing fit with the side wall of the inner cavity; the top block, the bottom block, the connecting column and the side wall of the inner cavity enclose an annular cavity; an air outlet hole is arranged in the valve body at one side, the inner end of the air outlet hole is communicated with the inner cavity of the valve body, the outer end of the air outlet hole is connected with an air outlet pipe, an air inlet hole is arranged in the valve body at the opposite side of the air outlet hole, the inner end of the air inlet hole is communicated with the inner cavity of the valve body, and the outer end of the air inlet hole is connected with an air inlet pipe;
a pressure spring is connected between the top end of the top block and the top wall of the inner cavity of the valve body; the bottom block is pressed downwards and connected with a push rod, the diameter of the upper part of the push rod is larger than that of the lower part of the push rod, the upper part of the push rod penetrates through the valve body and stretches into the inner cavity of the valve body, the upper part of the push rod is in sliding sealing fit with the valve body, and the top end of the push rod is in pressing fit with the bottom block; a fixed seat is arranged below the valve body, a vertical through hole is arranged in the fixed seat, and the lower part of the push rod downwards extends into the vertical through hole and is in sliding sealing fit with the hole wall of the vertical through hole; the lower end opening of the vertical through hole is connected with an expansion pipe, the expansion pipe is connected with a temperature sensing box, and expansion liquid is contained in the temperature sensing box; the temperature sensing box is arranged in the hot water cylinder;
the valve core is provided with an upper limit position and a lower limit position, and the air outlet hole is always communicated with the annular cavity when the valve core is positioned between the upper limit position and the lower limit position; the air inlet hole is isolated from the annular cavity when the valve core is positioned at the upper limit position, the valve core is positioned at the initial position of the valve core when the valve core is positioned at the lower limit position, and the air inlet hole is completely communicated with the annular cavity when the valve core is positioned at the initial position; the valve core is provided with a balance position, the balance position of the valve core is positioned between an upper limit position and a lower limit position, when the valve core is positioned at the balance position, the top end of the annular cavity is higher than the top end of the air inlet hole, the bottom end of the annular cavity is lower than the top end of the air inlet hole, and the annular cavity and the air inlet hole are in a partial communication state; the height of the annular cavity is equal to the height of the air inlet hole; the hot water thermostatic valve of the gas boiler is connected in series with the second gas branch pipe through the gas outlet pipe and the gas inlet pipe of the hot water thermostatic valve;
more than two sets of gas boilers are connected in parallel between the water supply main pipe and the water return main pipe; more than two sets of circulating pumps are connected in parallel;
the plate heat exchanger comprises a first inlet, a second inlet, a first outlet and a second outlet, wherein the first inlet and the first outlet are connected in series on a water supply main pipe, and the second inlet and the second outlet are connected in series on a water return main pipe; and a flow balance valve is arranged on the pipeline at the first outlet.
2. An expansion-type constant temperature hot water system according to claim 1, wherein: more than two sets of plate heat exchangers are connected in parallel.
3. An expansion-type constant temperature hot water system according to claim 1, wherein: the bottom end of the water diversion tank and the bottom end of the water collection tank are respectively connected with a water drain valve.
4. An expansion-type constant temperature hot water system according to claim 3, wherein: a bypass pipe is connected between the water diversion tank and the water collection tank, and a differential pressure bypass valve is arranged on the bypass pipe.
5. An expansion-type constant temperature hot water system according to claim 4, wherein: an upper locating ring is arranged on the side wall of the inner cavity at the upper limit position of the valve core, and a lower locating ring is arranged on the side wall of the inner cavity at the lower limit position of the valve core.
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| CN107860065B (en) * | 2017-11-10 | 2023-10-24 | 西藏世峰高科能源技术有限公司 | Charging pile monitoring room air conditioning system |
| CN112577187A (en) * | 2020-12-02 | 2021-03-30 | 邢台职业技术学院 | Internal thermal circulation low-nitrogen combustion gas boiler |
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Effective date of registration: 20230529 Address after: 731100 Wayao Village, Chengjiao Town, Linxia City, Linxia Hui Autonomous Prefecture, Gansu Province Applicant after: Linxia Heating Co. Address before: NO.666, Zijingshan South Road, Guancheng District, Zhengzhou City, Henan Province, 450000 Applicant before: HUANGHE S & T College |
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