JPH0434360Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application and overview of the invention] The invention is a bypass mixing valve for a water heater, that is, a bypass circuit that bypasses the heat exchanger of the water heater and a circuit to be heated via the heat exchanger. This relates to a mixing valve that is inserted into a confluence point to maintain the surface temperature of the heat absorption part of the heated circuit above a certain temperature, and connects the three of the heated circuit, the bypass circuit, and the mixing valve. In addition, the flow rate ratio in the minimum throttle state of the circuit to be heated can be stabilized.

[Prior art and its problems] A bypass mixing valve that maintains the surface temperature of the heat absorption pipe of a heated circuit at a certain temperature or higher in a heat exchanger of a water heater to prevent condensate from being generated in the heat absorption pipe is disclosed in a patent application. It is disclosed in Publication No. 57-134648. In this system, a heated circuit that passes through a heat exchanger and a bypass circuit that bypasses this heat exchanger are merged, and the distribution flow ratio to the bypass circuit is determined by the output of a temperature-sensitive valve inserted in the heated circuit. is adjusted, thereby maintaining the surface temperature of the heat absorbing portion of the heated circuit at or above the set temperature, thereby preventing the generation of condensate in the heat absorbing tube.

However, in this conventional device, the minimum flow rate ratio on the heated circuit side is not stable, the valve structure is complicated, the internal resistance is large, and the accuracy of adjusting the flow rate ratio between the bypass circuit and the heated circuit is insufficient.

The present invention has been made in view of the above points, and is ``connected to a heated circuit 1 via a heat exchanger and a bypass circuit 4 that bypasses the heat exchanger,
By connecting a hot water supply circuit to an outlet from the confluence of the heated circuit 1 and the bypass circuit 4, and changing the degree of opening of the bypass circuit 4 in response to the temperature on the heated circuit 1 side. , adjusting the flow rate ratio between the heated circuit 1 and the bypass circuit 4;
A bypass mixing valve that maintains the surface temperature of the heat absorption part of the heated circuit 1 at a temperature above a temperature at which condensate does not occur, wherein the connection with the heated circuit 1, the bypass circuit 4, and the hot water supply circuit is easy; Flow resistance inside the valve device can be reduced, and
The objective is to stabilize the flow rate ratio in the minimum throttle state of the heated circuit 1.

[Technical Means] The technical means of the present invention taken to solve the above problems is as follows: ``One end of the cylindrical valve case 5 is used as the first connecting part 41 for connecting the bypass circuit 4, and the other end is made the first connecting part 41 for connecting the bypass circuit 4. is the second connection part 12 for connecting the circuit to be heated 1, and furthermore, a confluence point 50 of the circuits from the two connection parts is provided in the middle of this valve case 5, and hot water is supplied to the side wall of this confluence point. A third connection part 60 for circuit connection is provided, a valve seat opening 54 is provided on the second connection part 12 side of the confluence point 50, and the other first
A valve seat port 55 is provided on the connecting portion 41 side, and the tapered surfaces T ₁ and T ₂ at both ends of the valve body 51 accommodated in the confluence point 50 are respectively opposed to the opposing valve seat ports, and the second
A heat sensitive part 52 is housed in the vicinity of the connecting part 12, and the heat sensitive part 52 has a valve shaft 5 that advances toward the valve seat opening 55 side as the sensitive temperature rises and retreats as the sensitive temperature falls.
6, and the valve body 5 is attached to the tip of the valve shaft 56.
1, and the tapered surface _T1 is provided with the valve seat opening 5.
The valve body 51 is biased in the direction in which the valve body 51 faces the valve seat opening 54, and the valve body ₅₁ is forced into an orifice that communicates with the confluence point 50 from the second connecting portion 12 side when the tapered surface T1 faces the valve seat opening 54. 53, and under conditions where the temperature of hot water from the heated circuit 1 is below a certain level, the tapered surface _T1 comes into contact with the valve seat opening 54, thereby setting the minimum flow rate ratio on the heated circuit 1 side. , so that the heat absorption part of the heated circuit 1 is maintained at a temperature higher than that at which condensation does not occur even under the heating amount and heated water amount conditions when the outlet temperature on the downstream side of the confluence point 50 is set to the lowest temperature. , set the minimum flow rate ratio.
That's true.

[Operation] The above technical means of the present invention operates as follows.

In the bypass mixing valve configured as described above, the outlet of the heated circuit 1 is connected to the second connection part 12, the downstream end of the bypass circuit 4 is connected to the first connection part 41, and the third connection part 60 is connected to the hot water supply. The circuit is connected and used.

As a result, the valve shaft 56 advances or retreats depending on the temperature at the outlet of the heated circuit 1, and the tapered surfaces T ₁ , T ₂ ,
By changing the opening degree with the valve seat opening facing these, the ratio of the flow rate on the heated circuit 1 side and the flow rate on the bypass circuit 4 side is automatically adjusted, and the temperature of the heat absorption part of the heated circuit 1 is maintained at a predetermined temperature or higher. This prevents the generation of condensate in the heat absorbing portion.

When the outlet water temperature is set to the lowest temperature,
In this case, since the heat-sensing temperature of the heat-sensing part 52 is in the low temperature range, no thrust from the heat-sensing part 52 acts on the valve stem 56, and the closing force acting on the valve body 51 causes the tapered surface _T1 to close the valve seat opening 54, and the flow rate ratio on the heated circuit 1 side is set to a minimum by the orifice 53. Under these set conditions, the flow rate ratio is set so that no drainage occurs in the heat absorption part of the heated circuit 1, preventing the occurrence of drainage in that part.

When the set value of the hot water outlet temperature is changed to a high temperature side and the temperature on the heated circuit 1 side becomes high, the output of this moves the valve body 51 toward the valve seat opening 55 side, and the flow rate ratio on the heated circuit 1 side increases. This prevents the temperature of the outlet section on the heated circuit 1 side from becoming abnormally high.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

Since the bypass mixing valve is assembled by connecting the downstream ends of the heated circuit 1 and the bypass circuit 4 and the upstream end of the hot water supply circuit to the corresponding connection parts of the valve case 5, the heat exchanger and Connection of related water circuits is simple.

Since the configuration of the water circuit in the valve case 5 and the valve body 51 is simple, the flow resistance of the path where the heated circuit 1 and the bypass circuit 4 merge and are discharged to the hot water supply circuit side is small, and the bypass mixing valve is Improves accuracy.

Further, since the minimum flow rate ratio on the heated circuit 1 side under conditions where drainage is most likely to occur is set by the orifice 53, this minimum flow rate ratio is stabilized, and the effect of preventing the occurrence of drainage is improved.

[Example] Hereinafter, an example of the present invention will be described based on FIG. 1.

In this embodiment, the heat exchanger has a heat absorbing part 1a in the direction of the exhaust flow of the burner 3 provided at the lower part of the can
1b are arranged in two stages in parallel and communicated with each other, and the heat absorption part 1
A is located on the downstream side of the water circuit with respect to the heat absorption part 1b, and a bypass circuit 4 is arranged in parallel to the heat absorption part 1a.

A valve body 51 equipped with an orifice 53 is inserted into the confluence point 50 of the heat absorption pipe 11 of the heat absorption part 1a with the bypass circuit 4 on the downstream side, and both ends of this valve body are made into tapered surfaces T ₁ and T ₂ . The tapered surface faces a valve seat opening 54 formed at the downstream end of the heat absorption section 1a and a valve seat opening 55 formed at the downstream end of the bypass circuit 4.

When communicating with the heat absorbing parts 1a and 1b, the downstream end of the heated circuit 1 is connected to the valve body 51 at one end of the cylindrical valve case 5 housing the valve body 51, and this connection part 2 connection part 12. The other end of the valve case 5 becomes a first connection part 41 for connecting the downstream end of the bypass circuit 4, and the second connection part 12, the first connection part 41, and the merging point 50 are coaxial. A third connecting portion 60 is opened in the side wall of the valve case 5 corresponding to the merging point 50, and a downstream hot water supply circuit is connected to this.

The valve body 51 accommodated in the valve case 5 has a valve shaft 56
The valve shaft 56 is inserted into a heat-sensitive part 52 that is housed and fixed on the upstream side of the valve seat opening 54 and near the downstream side of the second connecting part 12. contains known temperature-sensitive pellets. This temperature-sensitive pellet has a characteristic of expanding in volume in proportion to temperature, and when the ambient temperature of the heat-sensing section 52 rises, the valve stem 56 is advanced. Conversely, when the temperature drops, the advancing force disappears and the valve body 5
1 is returned to the advanced position corresponding to the temperature at that time.

The mounting position of the heat-sensitive part 52 is set in advance at a predetermined position, and under the condition that the hot water temperature is set to the lowest temperature by the proportional control valve 6, one tapered surface _T1 of the valve body 51 is located at the valve seat opening. 54, and the circuit from the valve seat port 54 is communicated to the downstream side only via the orifice 53. Note that the opening degree of the orifice 53 is set to a predetermined size so that the flow rate condition is such that no drainage occurs in the heat absorbing portion 1a when the tapping temperature is set to the lowest temperature. In other words, when the heated circuit 1 side communicates with the downstream side only through the orifice 53, this is the minimum flow rate ratio of the heated circuit 1, and this value is set to a predetermined value depending on the capacity and type of the heat exchanger. be done.

In addition, in this embodiment, as the proportional control valve 6,
The output from the sensor 61 is input to the output device 63, and the output from the hot water temperature setting device 64 drives the valve device 62 to maintain the hot water outlet temperature at the set temperature. According to the value, the valve body 51 in the valve case 5 moves,
The flow rate ratio between the heated circuit 1 and the bypass circuit 4 is set to a value suitable for this condition.

In the above embodiment, the heat absorption parts 1a and 1b are set in two stages in the direction of the exhaust flow of the burner 3, but by providing them at the same position, the bypass circuit 4 bypasses the heat absorption parts 1a and 1b. It may be arranged so that

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and in the figure, 1... heated circuit, 4... bypass circuit, 5...
...Valve case, 41...First connection part, 12...Second
Connection part, 50... Merging point, 60... Third connection part,
54... Valve seat port, 55... Valve seat port, T ₁ , T ₂ ...
Tapered surface, 52... Heat sensitive part, 56... Valve stem, 51
... Valve body, 53 ... Orifice.

Claims (1)

[Scope of utility model registration request] It is connected to a heated circuit 1 via a heat exchanger and a bypass circuit 4 that bypasses the heat exchanger, and a hot water supply circuit is connected to an outlet from a confluence of the heated circuit 1 and the bypass circuit 4. the bypass circuit 4 in response to the temperature on the side of the heated circuit 1.
By changing the degree of opening of the heated circuit 1 and the bypass circuit 4, the flow rate ratio between the heated circuit 1 and the bypass circuit 4 is adjusted, and the surface temperature of the heat absorption part of the heated circuit 1 is maintained at a temperature above which condensate does not occur. In the bypass mixing valve, a first connecting portion 4 is provided for connecting one end of the cylindrical valve case 5 to the bypass circuit 4.
1, and the other end is used as a second connection part 12 for connecting the heated circuit 1, and furthermore, a confluence point 50 of the circuits from the two connection parts is provided in the middle of this valve case 5, A third connection part 60 for connecting the hot water supply circuit is provided on the side wall of this confluence point, a valve seat opening 54 is provided on the second connection part 12 side of the confluence point 50, and a valve seat is provided on the other first connection part 41 side. A mouth 55 is provided,
Tapered surfaces at both ends of the valve body 51 accommodated in the confluence point 50
T ₁ and T ₂ are arranged to face the opposing valve seat openings, and a heat sensitive part 52 is housed in the vicinity of the second connection part 12. The valve shaft 56 is provided with a valve shaft 56 that advances and retracts as the heat-sensitive temperature decreases, and the valve body 51 is provided at the tip of the valve shaft 56, and the tapered surface
The valve body 51 is moved in the direction in which T ₁ faces the valve seat port 54.
This valve element 51 forms an orifice 53 that communicates with the merging point 50 from the second connecting portion 12 side when the tapered surface T ₁ comes into contact with the valve seat opening 54 , and the valve element 51 forms an orifice 53 that communicates with the confluence 50 from the heated circuit 1 . When the temperature of the hot water is below a certain level, the taper surface _T1 comes into contact with the valve seat port 54, thereby setting the minimum flow rate ratio on the heated circuit 1 side, and discharging the hot water downstream of the confluence point 50. A water heater in which the minimum flow rate ratio is set so that the heat absorption part of the heated circuit 1 is maintained at a temperature higher than that at which drainage does not occur even under the heating amount and heated water amount conditions when the temperature is set to the minimum temperature. bypass mixing valve.