JPH0216200Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to an expansion tank installed in a cold/hot water piping system for air conditioning, etc. This invention relates to an expansion tank equipped with a ball tap valve that opens the supply waterway when

[Conventional technology]

Conventionally, in the above-mentioned expansion tank, the sixth
As shown in the figure, a ball tap valve 7 for opening and closing the supply waterway 6 was installed directly in the water storage part of the tank 5A (edited by the Society of Air Conditioning and Sanitary Engineers, Air Conditioning and Sanitary Engineering Handbook, Revised 9th Edition -240~ (See page 241).

In the figure, 4 is an expansion pipe connecting the expansion tank to a cold/hot water circulation pipe for air conditioning, 12 and 15.
is the overflow pipe attached to the tank body 5A, and
The vent pipe 14 is a drain valve for maintenance. Further, LWL is a set lower limit water level that serves as a reference for the opening/closing operation of the ball tap valve 7.

[Problem that the invention attempts to solve]

However, since the expansion tank's original function is to absorb changes in the volume of water held in cold and hot water piping systems for air conditioning by changing the stored water level, as mentioned above, the lower limit water level is not the standard for opening/closing operation. In the conventional structure in which the ball tap valve is directly installed in the water storage part of the tank, the ball tap valve, including the floating balls, is completely submerged when the stored water level is high.

However, in general, ball tap valves are designed in advance to ensure their water-stopping properties, so that even when a fraction of the ball is submerged in water, they have enough buoyancy to stop water. Therefore, as mentioned above, when the ball tap valve is completely submerged in water, an excessive buoyant force acts on it.
Due to the excessive buoyancy, there was a problem in that the ball tap valve, especially the valve seat part using an elastic packing and the link mechanism that interlocks the ball and the valve part, were damaged at an early stage.

Incidentally, as a means to prevent the ball tap valve from being completely submerged in water, as shown in Figure 7, only the ball 7A is placed in the water storage part of the tank 5A with the set lower limit water level LWL as a reference, while the link It is also conceivable that the valve part 7B linked to the ball 7A via the mechanism 7C is disposed above the upper limit water level HWL of the tank 5A.

However, with this method, the valve part will not be submerged in water, so although it is possible to prevent early corrosion of the valve part due to submergence, it is not possible to prevent the ball from being completely submerged in water at high water levels. Early damage to the ball tap valve due to the excessive buoyancy as described above was unavoidable.

The purpose of the present invention is to rationally improve the structure of attaching the ball tap valve to the expansion tank so that the ball of the ball tap valve and the valve part can be prevented from being submerged in water as the water level in the tank rises. It is in the point of doing.

[Means for solving problems]

The characteristic configuration of the expansion tank according to the present invention is that it is equipped with a ball tap valve that opens the replenishment waterway when the water level stored in the tank is below the set water limit water level, and a communication passage located at a lower level than the set lower limit water level. A replenishment water tank is provided which communicates with the tank through the replenishment water tank, the replenishment waterway is connected to the replenishment water tank, and the ball tap valve is installed inside the replenishment water tank, and the check valve allows only the supply of makeup water from the replenishment water tank into the communication passage. The action and effects are as follows.

[Effect]

The operation will be explained with reference to Fig. 1 A, B, and C.

(a) As shown in Figure 1a, due to particularly large volumetric contraction of the water held in the air conditioning cold and hot water piping system, etc., the water level WL in the tank 5A is lower than the set lower limit water level.
When the level becomes lower than LWL, the check valve 11 installed in the communication passage 10 allows the supply of make-up water, and the water level WL' of the make-up water tank 9 also becomes lower than the set lower limit water level LWL. Valve 7 opens.

The replenishment water supplied to the replenishment water tank 9 from the replenishment waterway 6 opened by opening the ball tap valve 7 is passed through the communication path 10 to the replenishment water tank 9.
This contributes to the return of the water level WL in the tank.

(B) As shown in Figure 1B, when the water level WL in the tank is at the set lower limit water level LWL, the water level WL' in the replenishment water tank 9 also reaches the set lower limit water level LWL, and therefore the ball tap valve 7 is closed. The supply of makeup water is stopped.

That is, with the effects of (a) and (b) above, the same automatic water supply function as before is achieved.

(c) On the other hand, as shown in Fig. 1c, due to the volumetric expansion of the water held in the air conditioning cold/hot water piping system, etc., the water level WL in the tank 5A is lower than the set lower limit water level LWL.
Even if the tank 5A becomes higher than the
The outflow of retained water from the side to the side of the replenishment tank 9 is prevented, and therefore the water level WL′ of the replenishment tank 9 is
The lower limit water level LWL, which is the reference water level for opening and closing the ball tap valve 7, remains maintained.

That is, the above-mentioned action (c) prevents the ball and valve portion of the ball tap valve 7 from being submerged in water due to the rise in the water level in the tank.

[Effect of idea]

As a result of the above, it is now possible to avoid excessive buoyancy, which can cause premature damage to the various parts of the ball tap valve, without impairing the water-stopping properties of the ball tap valve.
By avoiding submergence of the valve part, it is also possible to prevent early corrosion of the valve part, and as a whole, the ball tap valve can function well over a long period of time, and the reliability of automatic water supply can be improved. This is advantageous in terms of maintenance.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

Figure 2 shows an example of an expansion tank facility, which includes a heat source device 1 such as a boiler or a refrigerator, and load side equipment 2 such as an air handling unit or fan coil unit.
An open-type expansion tank 5 in which an expansion pipe 4 is connected to a cold/hot water circulation pipe 3 for air conditioning, and the other end of the expansion pipe 4 is disposed at a higher location than the cold/hot water circulation pipe 3. It is connected to.

In other words, changes in volume of water held in the cold/hot water circulation system due to changes in temperature, etc. are absorbed by fluctuations in the water level within the expansion tank 5.

The expansion tank 5 has a supply waterway 6 for it,
In addition, a ball tap valve is installed that opens the replenishment waterway 6 when the water level in the tank falls below the set lower limit water level. When the water level becomes lower than the water level, makeup water is automatically supplied to the expansion tank 5.

8 in the figure is a circulation pump in the cold/hot water circulation system.

As for the specific configuration of the expansion tank 5, as shown in FIG. and a communication path 1 located at a lower level than the lower limit water level LWL mentioned above.
It is connected via 0.

In addition, as for the specific structure, the replenishment water tank 9 is connected to the expansion pipe 4.
It is connected to the upper end side, and the upper end side portion of the expansion pipe line 4 also serves as a part of the communication path 10 that connects the replenishment water tank 9 and the tank 5A.

Then, the replenishment waterway 6 is connected to the replenishment water tank 9, and the ball tap valve 7 for automatic water supply that opens and closes the replenishment waterway 6 is arranged so that the set lower limit water level LWL is the reference water level for opening and closing. 9
and further includes a check valve 11 that only allows supply of makeup water from the makeup water tank 9 side to the communication path 10.
is interposed.

That is, the above-mentioned configuration causes the expansion tank 5 to function as follows.

(B) As shown in Figure 1B, if the water level WL in the tank 5 becomes lower than the set lower limit water level LWL due to a particularly large volumetric contraction of the water held in the cold/hot water circulation system, replenishment is required. Since the check valve 11 allows the supply of makeup water from the water tank 9 side, the water level WL' of the makeup water tank 9 also becomes lower than the set lower limit water level LWL, and accordingly, the set lower limit water level LWL
The ball tap valve 7, which is used as the reference for opening and closing, opens.

When the valve is opened, the makeup water supplied from the makeup waterway 6 to the makeup water tank 9 is sent out from the makeup water tank 9 via the communication path 10, and the water level in the tank is
Contributes to the return of WL.

(B) As shown in Figure 1B, when the water level WL in the tank is at the set lower limit water level LWL, the water level WL' in the replenishment water tank 9 also reaches the set lower limit water level LWL, and therefore the ball tap valve 7 is closed. The supply of makeup water is stopped.

In other words, the functions (a) and (b) above, or the water level in the tank.
This is an automatic water supply function to keep WL above the set lower limit water level LWL.

(c) On the other hand, as shown in Fig. 1c, even if the water level WL in the tank becomes higher than the set lower limit water level LWL due to the volumetric expansion of the retained water in the cold/hot water circulation system, the check valve 11 The stop action prevents the retained water from flowing out from the tank 5A side to the make-up water tank 9 side, so the water level WL' in the make-up water tank 9 is the set lower limit water level, which is the opening/closing standard water level of the ball tap valve 7.
Remains maintained at LWL.

In other words, due to the function (c) above, the water level in the tank
This prevents the ball tap valve 7 from being submerged in water as WL rises, and prevents the ball tap valve 7 from being damaged early due to excessive buoyancy caused by the ball 7A acting as a float in the ball tap valve 7 being completely submerged in water. This prevents the valve portion 7B of the ball tap valve 7 from being corroded early due to storage or submersion of the valve portion 7B in water.

An overflow pipe 12 is connected to the tank 5A,
The upper limit water level HWL is set depending on the connection position. In other words, the normal volume change of retained water in the cold/hot water circulation system is between the set lower limit water level LWL and the upper limit water level.
It is absorbed by fluctuations in the tank water level WL between HWL and HWL.

In the figure, 13 is a drain pipe, and a drain valve 14 is interposed therein.

Further, 15 and 16 are a tank 5A and a supply water tank 9.
17 is a manhole attached to the tank 5A.

A water supply channel 18 for initial water supply branched from the middle of the supply channel 6 is connected to the expansion pipe 4.
When refilling the cold/hot water circulation system with water, a water supply valve 19 interposed in the water supply channel 18 is opened so that the water can be filled quickly.

20 is a water stop valve for stopping automatic water supply when draining water from the tank 5A.

[Another example]

Next, another embodiment of the present invention will be described.

To form the replenishment water tank 9 in which the ball tap valve 7 is installed, the replenishment water tank 9 may be constructed by partitioning the inside of the tank 5A of various shapes with a partition wall 21, as shown in FIGS. 3 and 4. Alternatively, as shown in FIG. 5, the shape may be made compact by ensuring only the operating range of the ball tap valve 7, and various improvements can be made to the specific structure of the replenishment water tank 9.

The check valve 11 installed in the communication passage 10 to allow only the supply of makeup water from the makeup water tank 9 may be of various types, such as a swing check valve, a lift check valve, or a ball check valve. can be applied.

Furthermore, the check valve 11 may be installed in the communication path 10 by being installed in the replenishment water tank 9, as shown in FIG.

The expansion tank according to the present invention can be installed in piping systems for various uses in addition to cold/hot water piping systems for air conditioning.

Furthermore, the target fluid is not limited to water.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 A, B, and C are sectional views showing the operating state, and FIG. 2 is a schematic pipe diagram showing an example of a facility. FIGS. 3, 4, and 5 are plan views and perspective views, respectively, showing other embodiments of the present invention. FIG. 6 is a sectional view showing a conventional example, and FIG. 7 is a sectional view showing a comparative example. 5A...tank, 6...supply waterway, 7...ball tap valve, 9...supply water tank, 10...communication path,
11...Check valve, WL...Water level, LWL...Lowest setting water level.

Claims (1)

[Scope of utility model registration request] The storage water level WL in tank 5A is the set lower limit water level.
A replenishment water tank 9 is an expansion tank equipped with a ball tap valve 7 that opens the replenishment waterway 6 when the water level is below LWL, and communicates with the tank 5A via a communication passage 10 located lower than the set lower limit water level LWL. is provided, and the replenishment water tank 9 is provided with the replenishment waterway 6.
The expansion tank has the ball tap valve 7 installed therein, and has a check valve 11 interposed in the communication path 10 that allows only the supply of make-up water from the make-up water tank 9.