JPS5816098B2 - Hot water heating system and three-way switching valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a circulation pump 30, a water heater 31, and a water heater 3.
2. The switching valve 33 is connected to the hot water supply system line connected in a circular manner through piping to a heating system line provided with a heat exchanger 34 connected in parallel with the water heater and its blocking valve 35, and the switching valve 33 is The present invention relates to a hot water supply and heating system that uses a valve 33 to switch the flow path to hot water supply system A or heating system B, and to improvements in the switching valve.

Hot water supply and heating systems that switch between hot water supply and heating are already known, and various types of switching valves are used.

An example of a commonly used hot water supply and heating system will be explained with reference to FIG.

In this system, water supplied to a water heater 31 by a circulation pump 30 is heated by the water heater and sent to a water heater 32 and a heat exchanger 34. Due to the action of the element, the hot water temperature at the switching valve inlet C reaches a predetermined temperature (
For example, if the temperature is below 60℃, the switching valve should be c-)b open a-
+b is closed, hot water circulates through the hot water system, and water heater 3
In step 2, heat is exchanged with the tap water in another tank, and the tap water is sent to the hot water supply equipment.
It supplies flowing hot water but does not flow into the heating system.

Moreover, when the predetermined temperature is exceeded, the switching valve opens a-+b and closes c-+b, the hot water circulates through the heating system, and the hot water supply system is closed by the switching valve.

(However, the amount of bleat is allowed to flow due to the temperature detection of the thermoelement).

That is, the system switches to the hot water supply or heating system depending on the temperature of the hot water at the inlet C of the switching valve.

In the above system, the hot water is circulated by switching to the hot water supply or heating system at the temperature detected by the thermoelement of the switching valve, so for example, even if the system is being used for hot water supply, the circuits of other systems (heating system) are closed. Being in a state where circulation is possible at all times is an essential requirement for the normal operation of this system.

However, in the summer, the heating equipment is usually not used and the heat exchanger 34 is closed by the blocking valve 35, and when this method is used in such conditions, the temperature sensed by the thermoelement exceeds a predetermined temperature. In this case, the switching valve c-)b is closed (however, the amount of bleat flows due to the temperature detection of the thermoelement), and the heating system is closed with a blocking valve, so the discharge pipe is closed and the circulation pump is closed. This can cause the pump motor to overload and cause an accident.

In order to avoid these accidents and use this method of hot water heating in the summer, it is necessary to take measures such as changing the temperature setting of the thermo-element, which is beyond the reach of housewives and is a weak point of this system. It has become.

In view of the above, the present invention has devised the switching valve structure in the above-mentioned hot water supply/heating system, so that the conventional momme hot water supply system can be used without any problems even when the summer heating system is closed. The purpose of this invention is to provide a hot water supply and heating system and its switching valve.

The present invention will be explained below with reference to illustrated embodiments.

Figures 1 and 2 each show an embodiment of the switching valve, and Figure 3 shows an example of the switching valve.
The figure shows an example of a thermoelement.

In the switching valve shown in FIG. 1, the valve body 1 has a connection port C that connects to the outlet side piping of the water heater 32 in the system diagram shown in FIG.
1. It has a connection port a that connects to the outlet side piping of the heat exchanger 34, and a connection port that connects to the suction pipe of the circulation pump 30. It communicates via R.

Also, inside the valve body, there are connections between connecting rods c and b, and between connecting rods a and b.
A main valve body 4, which opens and closes the valve body 4 so as to proportionally communicate with each other with mutually opposite opening degrees, is provided so as to be movable left and right by sliding on the inner valve face 1 with a guide 4a.

As shown in the perspective view of FIG. 1-a, the main valve body 4 is formed by mounting and connecting a three-legged guide 4a inside a cylindrical body 4b, and a thermoelement 5 is held inside the guide. , the thermoelement 5 and the guide 4a are fixed together with a stop ring 6.

The thermoelement 5 has a retaining ring 2 fixed to the valve inner chamber.
The main valve body 4 is pressed and biased to the right in the figure by a main spring 3 interposed therebetween so as to come into close contact with the main valve body 4.

As an example of the thermoelement 5 is shown in FIG. 3, the case 11 includes a wax 12 that expands in volume due to heat.
is enclosed, and the volume expansion of the wax is caused by the diaphragm 13,
The fluid is transmitted to the piston 18 via the fluid substance 14, the rubber body 16, and the washer 17, and moves the piston. The thermoelement 5 and the valve body 4 are integrally fitted and fixed to the base of the piston 18. The tip is connection port a
The thermo element 5 operates at the temperature of the fluid flowing in from the connection port C.

Also, the sub-valve 9 is pivotally supported by the guide portion 15 of the thermoelement.
is provided to be slidable along the guide surface, and the sub-valve 9 is biased by a spring 10 to close the center hole 4c of the main valve body 4, so that the connection port c-a is normally in communication. is restrained.

In the above configuration, when the temperature of the fluid flowing in from the connection port C (the hot water on the outlet side of the water heater 32 in the system shown in FIG. 4) does not reach the set temperature of the thermoelement 5, the piston 71
The tip of the valve 8 does not come into contact with the end surface 8, but is separated from the end surface 8, and the valve body 4, together with the thermoelement 5, is pressed to the right in the figure by the main spring 3, and is seated on the valve seat 1a, and as described above, is pressed by the auxiliary valve 9. The center hole 4c is closed, the main valve body 4 opens between c and b, the switching valve 33 becomes between c and b, and between a and b, and the fluid flows through the connection port C.
flows from to b.

Next, when the fluid temperature of the connection port C reaches the set temperature, the piston 18 comes into contact with the vessel wall end face 8, and when the temperature further rises, the main valve body 4 is moved to the left in the figure together with the thermoelement 5, and a -b gradually opens, and c-b gradually closes, and the sub-valve body 9 follows the movement of the main valve body 4 with the elasticity of the spring 100) Finally, the fluid becomes connected between a-b and c-b. It flows from port a to b, and the flow rate from connection port C to b is only a small amount from the bleat hole.

In this case, when the heating system is closed by the blocking valve 35, the pressure p2 in the chamber a1 on the connection port a side in the valve body decreases, and the pressure p2 in the chamber a1 on the connection port a side decreases, and
When the pressure difference (p+f'2) between the pressure p1 in the center hole 4c and the pressure in the side chamber C1 becomes smaller than the elasticity of the spring 100, the auxiliary valve 9 slides to the right and separates the center hole 4c and the chamber. a1
conducts, the fluid on the side of the connection port C flows to the side of the connection port A and returns to the circulation pump via the connection port, thereby forming a fluid circulation path and preventing overload of the circulation pump.

FIG. 2 shows another embodiment of the switching valve, and the same parts as in FIG. 1 are designated by the same symbols.

The main valve body 4 in FIG. 2 is provided so as to slide on the valve inner chamber 7 surface by means of a three-film guide 4a that extends integrally with the cylindrical body 4b, and the thermoelement 5 is installed inside the cylindrical body 4b. It is held by the main valve body 4 and passes through the main valve body 4 in the central axis direction.

The stop ring 6 seals the through hole of the main valve body 4 and is fixed to the main valve body 4.

A side passage 22 communicating with the communication hole R in the valve body is bored in the chamber c1 in the valve body on the side of the connection port C, and a sub-valve seat 19 is formed at the opening of the side passage on the side of the C1 chamber. Sub-valve 2 that opens and closes the valve seat
0 is biased and supported by a spring 21 so as to close the valve seat.

In the above configuration, when the temperature of the C2 chamber is lower than the set temperature of the thermoelement 5, the main valve body 4 is pressed by the main spring 3, and the connection between a and b is closed, and the connection between c and b is opened, and the fluid flows through the connection port C. from b
The side passage 22 is in communication with the communication hole R, and the fluid pressure on both sides of the sub-valve 20 becomes equal pressure, and the elasticity of the spring 210 causes the sub-valve 20 to close the sub-valve seat 19, and the fluid flows to the hot water supply system. flows.

Next, c, when the indoor temperature reaches the set temperature of the thermoelement 5, the tip of the piston 18 of the thermoelement comes into contact with the end surface 8 of the vessel wall of the connection port a, and when the temperature further rises, the main valve body 4 together with the thermoelement 5 Move to the left of the diagram and a
-b gradually opens, b-c gradually closes, and finally a-b opens and c-b closes at the cylindrical surface 4b, and the fluid flows through the heating system and enters the side path from connection port a. Fluid is introduced through the communication hole R, and the internal pressure p1 of the chamber c1 is applied to the sub-valve 20 from the top surface.
, the combined force of the pressure p2 in the chamber a1 and the spring 21 acts on the lower surface.

In this case, when the heating system is closed with a blocking valve etc., the pressure p2 in the room aI decreases, and the difference between the pressure p1 in the room c1 and the pressure p1 P2
When the pressure is reduced due to the elasticity of the spring 21, the sub-valve 20 opens the sub-valve seat 19, and the fluid from the connection port C flows through the side passage 22 to the connection port a, returns to the circulation pump via the connection port, and returns to the circulation path. is formed to prevent overload of the circulation pump.

As explained above, the present invention is applicable to each of the circulation pumps, water heaters, water heaters, 0 port of the three-way switching valve having three ports a, b, and c, and the circulation pump connected to the port 80 of the three-way switching valve. A hot water supply system in which devices are sequentially connected in a ring through piping, a heat exchanger arranged with piping in parallel with the water heater of the hot water supply system, and a heat exchanger installed in series with the heat exchanger in the connecting piping of the heat exchanger. a hot water heating system having a heating system connected to the 8-port side of the three-way switching valve through a blocking valve, and detecting the hot water temperature on the outlet side of the water heater with a thermoelement built in the switching valve;
When the detected temperature is lower than the set temperature of the thermo-element, the above three-way switching valve is opened and closed for c-b and closed for a-b, and the connection is made between the circulation pump, water heater, water heater, three-way switching valve, and circulation pump. When the detected temperature is higher than the set temperature, the three-way switching valve is set to c-.
B opening/closing, a-b opening/closing, circulation pump, water heater,
In a system in which a heating system is formed by circulating fluid between a heat exchanger, a three-way switching valve, and a circulation pump, the hot water supply or heating system is selectively switched using a three-way switching valve.
A sub-valve is provided in the above three-way switching valve, and the C port side and 8
The auxiliary valve is opened and closed by the pressure difference on the mouth side, so that even when the heat exchanger is closed, the hot water supply system is kept conductive and the circulation flow path is prevented from being cut off. This system provides a hot water heating system and its switching valve, which eliminates the drawbacks of conventional hot water heating systems and allows the device to be used easily throughout the year.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of an embodiment of the three-way switching valve of the present invention, FIG. 1-a is a perspective view of the main valve body, and FIG. 1-a is a front view of the connection port a. FIG. 2 is a sectional view of another embodiment of the three-way switching valve. FIG. 3 is a sectional view of one embodiment of the thermoelement. FIG. 4 is an explanatory diagram of a system showing the hot water supply and heating system of the present invention. 1... Valve body, 2... Heavy wheel, 3...
...Main spring, 4...Main valve body, 5...
... Thermoelement, 6 ... Stop ring, 8 ... Device wall end surface, 9 ... Sub-valve, 1
0...Spring, 19...Vice valve seat,
20... Sub-valve, 21... Spring,
22... Side channel, 30... Circulation pump,
31... Water boiler, 32... Water heater, 33... Three-way switching valve, 34... Heat exchanger, 35... ...Blocking valve.

Claims (1)

[Claims] 1 Circulation pump, water heater, water heater, a, b. A hot water system in which each device of the circulation pump connected to the 0th port of the three-way switching valve and the 5th port of the three-way switching valve connected in a circular manner with piping, and the water heater of the hot water system are connected in parallel. A hot water supply and heating system having a heat exchanger installed with piping in the heat exchanger, and a heating system connected to the 8-port side of the three-way switching valve via a blocking valve provided in series with the heat exchanger in the connecting piping of the heat exchanger. system, detecting the hot water temperature on the outlet side of the water heater with a thermoelement built in the C port side of the three-way switching valve,
When the detected temperature is lower than the set temperature, the main valve body of the three-way switching valve is opened between c and b and closed between a and b to form the hot water supply system, and when the detected temperature is higher than the set temperature, the three-way switching valve is opened between c and b and closed between a and b. The main valve body of the switching valve is closed between c and b and open between a and b to circulate hot water between the circulation pump, water heater, heat exchanger, open blocking valve, and three-way switching valve circulation pump for heating. In a hot water heating system in which a hot water supply system or a heating system forming a system is selectively switched by a three-way switching valve, there is provided a communication path that communicates the 8-port side and the C-port side within the switching three-way valve body, and the communication path. is always biased in the closing direction, and a sub-valve is provided that opens when the fluid pressure on the C port side rises by a certain value or more than the fluid pressure on the 8 port side. In this hot water heating system, when the heating system is closed by a blocking valve, the hot water supply system can be made conductive through the auxiliary valve to prevent the circulation flow path from being cut off. 2. In the hot water heating system described in claim 1, the 0 port connected to the outlet side of the water heater, the 5 port connected to the inlet side of the circulation pump, and the 30 port connected to the heat exchanger outlet side.
c-b days and a provided in the three-way switching valve body with
-b A main valve body that slides inside the valve chamber so that the flow passage is proportionally communicated with each other at opposite opening degrees, and a main valve body that penetrates the main valve body in the axial direction and inside the main valve body. A three-way switch comprising a thermo-element which is held by the main valve body, is fixed to the main valve body, detects the temperature of the fluid passing through the zero port, compares the detected temperature with a set temperature, and operates the main valve body. In the valve, a flow path that communicates the C port side and the a and D sides in the three-way switching valve body;
Claim 1, characterized in that an auxiliary valve is provided that always biases the flow path in the closing direction with a set tension of a spring that counters the fluid pressure difference between the C port side and the 8 port side. Three-way switching valve for hot water supply and heating system.