JPH0725557Y2 - Water heater priming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a priming device in a water heater with forced reheating equipped with a circulation circuit for forcibly circulating and heating hot water in a bathtub by a circulation pump.

(Prior Art) Generally, in a water heater with forced reheating, it is necessary to prime the circulation pump when the equipment is installed or reused after draining the circulation circuit.

Therefore, it is known that the drainage connection port provided at the water supply port of the water heater and the drainage connection port provided at the drainage port of the circulation circuit communicate with each other through a hose to perform priming (for example, Japanese Utility Model Publication No. 60-39714). .

(Problems to be solved by the invention) However, when the priming water is sent to the circulation pump, the hose may come off due to the water supply pressure.

(Means for Solving the Problems) The present invention is to solve the above problems, and a priming device according to claim 1 is a water supply side provided at a water supply port of a hot water supply circuit for heating and supplying hot water. In the case where the priming water connection port and the priming water connection port on the pump side provided in the circulation circuit for forcedly circulating and heating the hot water of the bathtub by the circulation pump communicate with each other through the hose to priming the circulation pump, The opening area of the priming water connection port is smaller than the opening area of the priming water connection port on the pump side.

The priming apparatus according to claim 2 is a pump provided with a priming connection port on the water supply side provided in a water supply port of a hot water supply circuit for heating and supplying hot water to a circulation circuit for forcibly circulating and heating hot water in a bathtub with a circulation pump. Side priming water connection port is connected via a hose to priming the circulation pump, and a priming water plug that is screwed into the priming water connection port on the water supply side and is brought into contact with or separated from the valve seat of the priming water connection port. In addition to the provision, a connection plug that is screwed into the priming water connection port on the pump side and is brought into contact with and separated from the valve seat of the priming water connection port is provided, and the screw pitch of the priming water plug is smaller than that of the connection plug.

(Operation) According to the priming apparatus of the present invention, the opening area of the priming water connection port on the water supply side is smaller than the opening area of the priming water connection port on the pump side when priming water. , The amount of water flowing through the priming water connection port on the pump side can be made larger than the amount of water flowing through the priming water connection port on the water supply side, which prevents the hose from bulging under water pressure and coming off.

Further, according to the priming apparatus of claim 2, when the priming is performed, the screw pitch of the priming tap is made smaller than that of the connecting tap, so that when the both taps are similarly rotated, the connecting tap side is widened, The amount of water flowing through the priming water connection port on the pump side can be made larger than the amount of water flowing through the priming water connection port on the water supply side, which prevents the hose from bulging under water pressure and coming off.

(Example) Next, the Example of this invention is described based on drawing.

In the drawing, reference numeral 1 denotes a water heater main body, which is not shown, but a circulation circuit for forcibly circulating hot water in a bathtub outside the main body 1 by a circulation pump inside the main body 1 and heating it by a heat source such as a gas burner during the circulation, It also has a hot water supply circuit for heating the hot water by a heat source (not shown).

Reference numeral 2 denotes a water supply port provided on the lower surface of the main body 1 for supplying water to the hot water supply circuit, and a water removal connection including a seat port 3a and a drain plug 3b for closing the water supply circuit for removing water in the hot water supply circuit. A priming water connection port 4 on the water supply side, which includes a port 3 and a basin 4a for priming the circulation pump and a priming plug 4b for closing the basin 4a, is provided.

5 is a priming port of the circulation pump, which is provided with a priming port 6 composed of a seat port 6a and a connecting plug 6b for closing the basin port 6a, and the priming port 6 on the pump side is also used as a drain port of the circulation circuit. .

The water drain plug 3b, the priming water plug 4b, and the connection plug 6b are allowed to pass water by loosening their screw parts. Especially the hydrant
Both 4b and connection plug 6b are hollow, and you can loosen the screw without removing it completely like the water drain plug 3b.
Water is passed through the hollow passages 4d, 6d through the hollow cylinders 4c, 6c.

In this embodiment, the valve seat 4 provided at the priming water connection port 4 on the water supply side
The seat diameter of the seat 4a connected to a ′ is 2.5 mmΦ, the water hole 4c of the priming tap 4b is 2 mmΦ × 2, and the hydrant 4b has a hollow passage 4d of 5
It was set to mmΦ.

Further, a valve seat port 6a 'provided in the priming water connection port 6 on the pump side.
The seat diameter of the seat 6a connected to is 4.5 mmΦ, and the water hole 6
c is 4.0 mmΦ x 2 and the hollow passage 6d of the connection plug 6b is 4.5 mm
Φ.

Reference numeral 7 is a hose for connecting the priming water connection port 4 on the water supply side and the priming water connection port 6 on the pump side, and in this example, they are connected by a priming water plug 4b and a connecting plug 6b.

Reference numeral 8 is an O-ring, and 9 is a sleeve having an axial slit, which is sequentially fitted onto the end of the priming plug 4b.

An enlarged portion is formed at the tip of the priming plug 4b, which acts as a retaining means 10 for preventing the O-ring 8 and the sleeve 9 from coming off the priming plug 4b.

Since the sleeve 9 has a slit, the sleeve 9 can be expanded to have an inner diameter larger than the outer diameter of the retaining means 10, so that the sleeve 9 can be fitted onto the end portion of the priming plug 4b. . After this, the sleeve 9 returns in the direction in which the space for slitting becomes narrower, and the retaining means 10
This prevents the priming plug 4b from coming off.

The sleeve 9 is such that the inner diameter of the sleeve 9 when the slit gap disappears> the outer diameter of the end of the priming tap 4b, and the hose is attached to the end of the priming tap 4b to prime the circulation pump. When the end of 7 is externally fitted, the sleeve 9 is tightened by this, but the inner diameter of the sleeve 9 is slightly larger than the outer diameter of the priming tap 4b even if there is no gap for slitting. It is possible to rotate the priming plug 4b for passing water without twisting 7.

Similarly, an O-ring 11 and a sleeve 12 are similarly fitted onto the end portion of the connection plug 6b in this order.

The sleeve 12 also has a slit in the axial direction and can be fitted onto the end portion of the connection plug 6b by expanding the sleeve 12 beyond the outer diameter of the retaining means 13 formed of an enlarged portion at the tip of the connection plug 6b.
In this case as well, after the sleeve 12 is externally fitted, the sleeve 12 returns to the direction in which the space for slitting becomes narrower, and the retaining means 13 prevents the sleeve 12 from coming off from the connection plug 6b.

The inner diameter of the sleeve 12 when the slit clearance of the sleeve 12 is eliminated> the outer diameter of the end portion of the connection plug 6b,
Since the circulation pump is primed, the sleeve 12 is tightened when the hose 7 is externally fitted to the end of the connection plug 6b, but the inner diameter of the sleeve 12 is the outside of the connection plug 6b even when the slit gap is eliminated. Since the diameter is slightly larger than the diameter, the connection plug 6b can be rotated for water passage without twisting the hose 7.

The sleeve 12 is provided with a tapered portion 12b and a hook portion 12c at its tip, so that the hose 7 can be fitted easily and the hose 8 is hard to come off without being tightened with a hose band.

Incidentally, 14 is a hose band, which is provided only on the priming tap 4b side in this example.

Here, seat ports 4a of both connection ports 4 and 6 and two water holes 4
c, opening area of hollow passage 4d and seat 6a, water hole 6c, hollow passage 6
The diameter of the seat 4a in the priming water connection port 4 which is the smallest hole diameter in the opening area of d <the priming water connection port 6 on the pump side.
Since the seat diameter of the seat port 6a at is, when priming the circulation pump through the hose 7 by loosening the priming plug 4b and the connecting plug 6b, the amount of water passing through the priming water connecting port 4 on the water supply side is It does not exceed the amount of water passing through the priming water connection port 6. Further, the seat diameter of the seat opening 4a is set to 2.5 mmΦ, which is small so that the surface tension works when the water is stopped, and the hose 8 is hard to come off even when the water supply pressure is about 5 kg / cm ² .

FIG. 5 shows another embodiment of the present invention, in which the water supply port 2 of the water heater is provided with a water draining connection port 3 and a water draining plug 3b of the water draining connection port 3 in the center thereof and coaxially therewith. It is not particularly different from that of the above-mentioned embodiment except that the side priming water connection port is attached. In this case, the water supply port 2 can be shared with the water supply port of a water heater having no circulation circuit.

In the above-described embodiment, when the water flow rate of the priming water connection port 6 on the pump side> the water flow rate of the priming water connection port 4 on the water supply side, the seat diameter of the seat 6a in the priming water connection port 6 on the pump side> water supply Although the seat diameter of the seat 4a in the priming water connection port 4 on the side is defined as, the water hole 6c of the connection plug 6b> the water hole 4c of the priming water plug 4b, and the diameter of the hollow passage 6d> the diameter of the hollow passage 4d. , Or a seat provided on the priming connection 6 side of the pump
6a, water hole 6c, hollow passage 6d, compared with the smallest of the opening area, the seat 4a, 2 which is always provided on the priming connection 4 side of the water supply side
The smallest of the opening areas of the individual water holes 4c and the hollow passages 4d may be reduced.

In addition, since the pitch of the threaded portion of the connection plug 6b> the pitch of the threaded portion of the priming water tap 4b, even if the connection plug 6b and the hydration water tap 4b are twisted and unscrewed the same number of times, there may be a returning force due to the hose.
It is preferable that the connection plug 6b be sufficiently separated from the seat opening 6a.

Further, in the above-mentioned embodiment, the hose 7 is connected to the priming plug 4b and the connecting plug 6b, but the water supply port 2 and the priming port 5 are connected.
A projection for directly connecting the hose 7 may be provided, and a cock type may be provided in place of the priming plugs 4b and the connecting plugs 6b of the priming water connection ports 4 and 6.

In the above-described embodiment, compared with the smallest of the opening areas of the seat 6a, the water hole 6c, and the hollow passage 6d provided on the side of the priming connection 6 on the pump side, the priming connection 4 side on the water supply side is always connected. A seat provided
4a, the two water holes 4c and the hollow passage 4d have the smallest opening area, so that the drainage capacity of the priming connection port on the pump side is greater than the amount of water entering from the priming connection port on the water supply side. I tried to prevent the hose from bulging under water pressure and coming off, but this is the priming connection port 6 on the pump side.
Side 6a, water hole 6c, opening area of hollow passage 6d and priming connection port 4 side on the water supply side 4a, 2 water holes 4
c. Regardless of the opening area of the hollow passage 4d, for example, instead of equalizing the opening areas, the priming water screwed into the priming water connection port 4 on the water supply side is brought into contact with or separated from the valve seat 4a of the priming water connection port 4. The screw pitch between the plug 4b and the connection plug 6b which is screwed into the priming water connection port 6 on the pump side and is brought into contact with and separated from the valve seat 6a of the priming water connection port 6 is as shown in FIG. 3 and FIG. By making the screw pitch of the priming plug 4b smaller than that of the connecting plug 6b, the connecting plug 6b side will always open wide when rotating both faucets in the same way, and more than the amount of water flowing from the priming water connection port on the water supply side. Moreover, the amount of water flowing through the priming water connection port on the pump side can be increased, which allows the hose to swell with water pressure and come off.

(Effect of the Invention) As described above, according to the priming device of claim 1 of the present invention, the opening area of the priming water connection port on the water supply side is smaller than the opening area of the priming water connection port on the pump side. The amount of water flowing through the priming water connection port on the pump side can be made larger than the amount of water flowing through the priming water connection port, which has the effect of preventing the hose from expanding due to water pressure and coming off of the hose.

Further, according to the priming device of claim 2, when the priming is performed, the screw pitch of the priming plug is made smaller than that of the connecting plug, so that when the both faucets are rotated in the same manner, the connecting plug side is largely opened, and the water supply is performed. The amount of water flowing through the priming water connection port on the pump side can be made larger than the amount of water flowing through the priming water connection port on the side.
This has the effect of preventing the hose from bulging under water pressure and coming off.

[Brief description of drawings]

FIG. 1 is a schematic view of the overall configuration showing an example of the implementation of the device of the present invention, FIG. 2 is a front view of the main part of the device, and FIG. FIG. 5 is a cutaway front view showing a main part of another embodiment of the device of the present invention. 2 ... Water supply port 4 ... Water supply side priming water connection port 4a ...... Seating port 4b ...... Priming water plug 6 ...... Pump side priming water connection port 6a ...... Seating port 6b ...... Connection plug 7 ...... Hose

Claims (2)

[Scope of utility model registration request] 1. A priming water connection port on the water supply side provided at a water supply port of a hot water supply circuit for heating and supplying hot water, and a priming water connection port on the pump side provided in a circulation circuit for forcedly circulating and heating hot water in a bathtub by a circulation pump. In which water is communicated via a hose for priming the circulation pump, the opening area of the priming water connection port on the water supply side is smaller than the opening area of the priming water connection port on the pump side. Priming device. 2. A priming water connection port on the water supply side provided at a water supply port of a hot water supply circuit for heating and supplying hot water, and a priming water connection port on the pump side provided in a circulation circuit for forcibly circulating and heating hot water in a bathtub by a circulation pump. In order to prime the circulation pump by communicating with and through a hose, a priming plug that is screwed into the priming connection port of the water supply side and is brought into contact with and separated from the valve seat of the priming connection port is provided. A priming device for a water heater, comprising a connection plug screwed into the priming water connection port to contact with and separate from a valve seat of the priming water connection port, and a screw pitch of the priming water plug is made smaller than that of the connection plug.