JP4325529B2 - Hot water storage water heater - Google Patents

Description

The present invention relates to a hot water storage type water heater such as a CO ₂ heat pump water heater.

A conventional hot water storage type water heater has a pressure reducing valve that controls the supplied water pressure to be constant, and the body for fixing the pressure reducing valve is provided with a cylindrical strainer at the inlet and a check valve at the outlet. (See, for example, Patent Document 1).
JP 11-315945 A

  However, in the above-described conventional configuration, the pressure reducing valve body is generally made of bronze casting, and the water passage in the body is formed by a core type, which has the advantage of achieving both water pressure resistance and corrosion resistance, but bronze. The heavy metal (lead) contained in the casting material has a problem that it must be stopped from the viewpoint of environmental protection.

  In order to solve this problem, when using a metal material with reduced heavy metal content by changing the material of the pressure-reducing valve body, the corrosion resistance performance against tap water is reduced, resulting in poor check performance. If the entire body is made of a resin material with excellent corrosion resistance, the water pressure resistance will be reduced, resulting in problems such as high pressure from a water hammer or freezing damage. It was.

  The present invention solves the above-mentioned conventional problems, eliminates heavy metals contained in the pressure reducing valve body material, supports environmental protection, and has both corrosion resistance against tap water and pressure breakdown capability. The purpose is to realize a hot water heater.

In order to achieve the above conventional problems, the hot-water storage type hot water supply apparatus of the present invention, a pressure reducing valve unit, and a body wherein the pressure reducing valve reducing valve fitted with a unit, and a strainer for body attached to the body for the pressure-reducing valve comprising, a body for the pressure reducing valve has a substantially cylindrical shape with opposite open ends, whereas Attach the pressure reducing valve unit to an end, only set the check Me valve to the other end, the pressure reducing valve unit
Provided with a primary side inlet through which water flows in, a secondary side outlet through which water flows out, and a pressure regulating spring that varies the degree of opening of the secondary side outlet according to water pressure, and is provided in the pressure reducing valve unit . An inlet hole communicating with the strainer body is provided on the side surface of the pressure reducing valve body facing the primary inlet through which water flows in , and a pressure receiving spring for relaxing the water pressure is provided in the strainer body, and the opening of the inlet hole is While making it smaller than the opening area of both ends of the pressure reducing valve body, the spring coefficient of the pressure receiving spring is larger than the spring coefficient of the pressure adjusting spring .

  This eliminates the heavy metals contained in the pressure reducing valve body material, supports environmental conservation efforts, and reduces only the cross sectional area of the inlet hole of the pressure reducing valve body, thereby reducing the required water flow rate. Therefore, it is possible to realize a structure that ensures the pressure breakdown performance without impairing the usability as a water heater. In other words, it has a very simple shape with a small opening branch on the side of the pressure reducing valve body, which is not only advantageous for pressure breakdown performance, but also when the resin material flows smoothly during injection molding. The bond is tight and the strength is stable, and it is possible to ensure the resistance to breaking against water hammer and freezing.

  The hot water storage type hot water supply apparatus of the present invention eliminates heavy metals contained in the body material for the pressure reducing valve, is compatible with environmental protection, and has both corrosion resistance performance against pressure water and pressure breakdown capability.

The first invention includes a pressure reducing valve unit, wherein the a body a pressure reducing valve unit attached pressure reducing valve, and a strainer for body attached to the body for the pressure reducing valve, body for the pressure reducing valve, both ends of which are open a substantially cylindrical shape, whereas Attach the pressure reducing valve unit to an end, only set the check Me valve at the other end, a primary inlet for water to flow into the pressure reducing valve unit, water and the secondary side outlet for outflow, a variable is to pressure control spring an opening degree of the secondary side outlet provided according to the water pressure, the pressure reducing valve in which the pressure reducing valve provided in the unit water facing the inlet primary flowing An inlet hole communicating with the strainer body is provided on the side of the body for the strainer, a pressure receiving spring for relaxing the water pressure is provided on the strainer body, and the opening of the inlet hole is made smaller than the opening area at both ends of the pressure reducing valve body . Spring of the pressure receiving spring Number, than the spring coefficient of the pressure regulating spring that has a large, without impairs ease of use as a water heater to ensure the necessary passing water, configured to secure the breakdown performance can be realized. In other words, it has a very simple shape with a small opening branch on the side of the pressure reducing valve body, which is not only advantageous for pressure breakdown performance, but also when the resin material flows smoothly during injection molding. The bond is dense and the strength is stable, and it is possible to ensure the resistance to breaking against water hammer and freezing.
In addition, when a water hammer or freezing occurs, the pressure receiving spring contracts, making it possible to efficiently relieve the impact and improve the pressure breakage performance including freezing. Furthermore, in the case of the water hammer phenomenon, the pressure resistance performance of all the structures communicating with the water supply pipe can be improved, and hot water supply that can be used safely for a long time can be realized.
In addition, the spring coefficient of the pressure receiving spring is larger than the spring coefficient of the pressure regulating spring built in the pressure reducing valve unit, so that the pressure receiving spring hardly operates against the water pressure that fluctuates with the use of normal hot water supply. In addition to suppressing the generation of unpleasant noise caused by vibrations in the water supply and hot water supply pipes, this pressure receiving spring is activated only when a large pressure fluctuation such as a water hammer caused by external factors or stress due to freezing occurs. It can be set to exert a buffering effect against pressure and stress.

  The second invention, in particular, in the first invention, the check valve has a seat, a spring, and a spring receiving portion, and the pressure reducing valve body has a seal rib at a position in close contact with the check valve seat, Since the pressure reducing valve body and the seal rib are integrated, the seal rib that is in close contact with the check valve seat is integrally formed of a corrosion-resistant resin, so the check performance deteriorates due to metal corrosion. There is nothing. Furthermore, due to the merit that the seal rib and the pressure reducing valve body are integrated, the cross-sectional area of water flow when the check valve is open can be secured to the maximum, and the hot water flow rate and shower flow rate can be increased. Usability as an improvement. That is, it is possible to shorten the time required for hot water to the bath tub, improve the feeling during showering, and improve comfort.

  In a third aspect of the invention, particularly in the first or second aspect of the invention, the strainer body has a cylindrical shape with both ends open, one end serves as a water supply pipe connection port, and the other end is a detachable cylindrical shape. A strainer mounting part is provided, and there is a communication hole communicating with the inlet hole of the pressure reducing valve body on the side surface. The opening of the communication hole is smaller than the opening area of both ends of the strainer body, so that the check valve is connected to the strainer. Being on the downstream side and the supplied tap water is designed to pass from the inside of the cylindrical strainer. It does not require a construction method using a core mold made of bronze casting, and can use metal or resin materials that do not contain heavy metals, and can respond to environmental conservation efforts. That.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment)
1 to 3 show a hot water storage type water heater and a pressure reducing valve portion thereof in an embodiment of the present invention.

1 to 3, the hot water in the hot water storage tank 1 for storing hot water is taken out and heated by the heating means 2, and then returned to the hot water storage tank 1 to form the boiling circuit 3, and high temperature water is stacked from the upper part of the hot water storage tank 1. Hot water is stored in the state. In the present embodiment, a heat pump water heater using a supercritical heat pump cycle using CO ₂ as a refrigerant as a heat source will be described. However, an electric water heater using an electric heater as a heat source may be used. It may be provided inside the tank 1 or may be provided outside the hot water storage tank 1.

  A rectangular parallelepiped exterior housing 4 that houses the hot water storage tank 1 is open at the front, and a detachable front plate 5 by screws 4-2 is fixed thereto. In the case of construction for hot water supply piping or electrical work, or in the case of maintenance work, the front plate 5 can be removed.

  And the tap water supplied from the pressure reducing valve part 6 provided with the water supply port is supplied to the lower part of the tank 1 and the hot water supply mixing valve 11 through the water supply pipe 8 and the bypass pipe 9 in the water supply branch part 7. The water supplied to the lower part of the tank 1 pushes up the hot water in the tank 1 upward, and discharges the hot water from the hot water supply pipe 12 through the hot water mixing valve 11 from the hot water supply port 10. In the hot water supply mixing valve 11, the hot water discharged from the hot water supply port 10 and the tap water of the bypass pipe 9 are mixed, adjusted to an appropriate temperature for use as hot water supply, and can be supplied from the hot water supply pipe 12. .

  Next, the configuration of the pressure reducing valve unit 6 will be described with reference to FIG. The pressure reducing valve unit 6 is provided in the pressure reducing valve unit 13, the pressure reducing valve body 18 to which the pressure reducing valve unit 13 is attached, the strainer body 22 attached to the pressure reducing valve body 18, and the pressure reducing valve body 18. And a check valve 37.

  The pressure reducing valve unit 13 includes a secondary side outlet 14, a secondary pressure transmission unit 15, and a primary side inlet 16, and the degree of opening of the secondary side outlet 14 is variable according to the water pressure in the secondary pressure transmission unit 15. The pressure regulating spring 17 is built in. The pressure reducing valve body 18 is injection-molded with a PPS (polyphenylene sulfide) resin material having excellent heat resistance and strength, and has a substantially cylindrical shape with both ends opened. An opening 19 for attaching the pressure reducing valve unit 13 is provided at one end of the pressure reducing valve body 18, and an outlet 20 having a check valve 37 is provided at the other end, which faces the primary side inlet 16 of the pressure reducing valve unit 13 on the side surface. There are an inlet hole 21 at a position where a flange 23 for attaching a strainer body 22, a drain hole 24 and a drain plug mounting portion 25 are provided. The inlet hole 21 and the drain hole 24 are designed to be very small compared to the opening areas of the opening 19 and the outlet 20, and the pressure-reducing valve body 18 has a simple cylindrical shape as a whole, which is advantageous for pressure breakdown performance. In addition to its shape, the resin material flows smoothly during injection molding, the resin material is tightly bonded and the strength is stable, and it is possible to ensure the destruction resistance against water hammer and freezing.

  The check valve 37 includes a seat 26, a spring 27, and a spring receiving portion 28. The inner wall of the outlet 20 of the pressure reducing valve body 18 has a seal rib 29 at a position in close contact with the seat 26, and the spring 27 and the flow of water against the flow of water entering the pressure reducing valve body 18 from the outlet 20. As a result, the seat 26 and the seal rib 29 are in close contact with each other, and the check valve 37 is configured. Further, due to the merit that the pressure reducing valve body 18 and the seal rib 29 are integrated, a maximum water cross-sectional area can be secured when the check valve 37 is open, and the hot water supply flow rate and the shower flow rate are increased. It is possible to improve usability as a water heater. That is, it is possible to shorten the time required for hot water to the bath tub, improve the feeling during showering, and improve comfort.

  Further, the pressure reducing valve body 18 and the seal rib 29 have an integrated structure, and are excellent in corrosion resistance against tap water containing a large amount of chlorine ions, and are worried about deterioration of the check performance due to poor adhesion with the seat 26. There is no need.

  The strainer body 22 has a cylindrical shape with both ends open, and has a water supply pipe connection port 30 with pipe threading such as R3 / 4 on the outer periphery of one end, and the other end 24 is a female screw. The shape is such that the detachable cylindrical strainer 31 can be attached. The side surface has a communication hole 32 for the pressure reducing valve body and a connection portion 33 for the pressure reducing valve body, and is connected and fixed to the flange 23 of the pressure reducing valve body 18.

  As described above, the seat 26 of the check valve 37 is formed between the cylindrical strainer 31 and the hot water storage tank 1, and the tap water supplied from the water supply pipe connection port 30 passes from the inside of the cylindrical strainer 31. Therefore, by closing the water supply to the hot water storage type hot water heater at the time of maintenance, the cylindrical strainer 31 can be cleaned without draining the hot water or the water in the hot water storage tank 1 as well as the water supply. Foreign matter floating in the water is deposited inside the cylinder of the cylindrical strainer 31 so that it can be surely removed.

  In addition, the communication hole 32 of the pressure reducing valve body is designed to be very small compared to the opening area of both ends of the strainer body 22, and the strainer body 22 is also a simple cylinder as a whole, which is advantageous for pressure proof fracture performance. Not only in the shape, but also in the case of PPS (polyphenylene sulfide) resin material with excellent heat resistance and strength, the resin material flows smoothly at the time of injection molding, the bonding of the resin material is dense and the strength is stable, Destruction resistance against water hammer and freezing can be secured. In addition, since the shape of the strainer body 22 is simple, it can be formed by general cutting using a forging brass material, which is suitable for a powerful screwing operation using a pipe wrench to the water supply pipe connection port 30. Design that considers strength is also possible.

  With the configuration as described above, it is possible to eliminate the heavy metal contained in the material in the conventional technique, and it is possible to cope with environmental conservation efforts.

  Furthermore, by reducing only the water cross-sectional area of the primary side inlet 16 having a high water pressure upstream of the pressure reducing valve unit 13 and the communication hole 32 of the pressure reducing valve body, the necessary water flow rate is ensured and the usability as a water heater is improved. A configuration that achieves both water pressure resistance and corrosion resistance performance is achieved without sacrificing goodness. The strainer 31 includes a pressure receiving wall 34 and a pressure receiving spring 35, and the pressure receiving wall 34 is perpendicular to the flow of water. As a result, the pressure-receiving spring 35 contracts in conjunction with the water hammer and the stress at the time of freezing, so that an efficient impact relaxation can be obtained, and the pressure breakage performance including freezing is improved. Furthermore, in the case of the water hammer phenomenon, the pressure resistance performance of all the structures communicating with the water supply pipe can be improved, and hot water supply that can be used safely for a long time can be realized.

  In addition, the spring coefficient of the pressure receiving spring 35 is set to be larger than that of the pressure regulating spring 17, and the pressure receiving spring 35 hardly operates with respect to the water pressure which fluctuates due to the use of normal hot water supply. In addition to suppressing the generation of unpleasant noise caused by vibrations in the pipes, it exerts a stress buffering effect only when a large pressure fluctuation such as a water hammer caused by an external factor or stress due to freezing occurs. Furthermore, the direction of the inlet hole 21 and the outlet 20 of the pressure reducing valve body are orthogonal to each other, thereby simplifying the processing of the pipe at the junction between the water supply path to the hot water storage tank 1 and the hot water temperature adjusting bypass path, The shower flow rate can be increased, improving usability as a water heater.

  As shown in FIG. 4, the pressure reducing valve body may be a pressure reducing valve body 36 having an L-shaped cylindrical shape. This makes it easy to make changes without making any significant changes, thus enabling the promotion of environmental conservation efforts.

  As described above, the hot water storage type water heater according to the present invention can eliminate the heavy metal contained in the material, and can not only cope with environmental conservation efforts but also secure the necessary water flow rate. As a hot water heater, it has the advantage of being able to realize a pressure reducing valve configuration that achieves both water pressure resistance and corrosion resistance without sacrificing ease of use as a hot water heater, and is supplied based on late-night electricity and hourly rate systems. The present invention is not limited to hot water storage water heaters that boil hot water using electric power, and can also be applied to devices that store hot water using gas, oil, solar heat, etc., and supply hot water using the hot water.

Sectional drawing of the pressure-reduction valve part of the hot water storage type hot water heater in embodiment of this invention The figure which shows the whole structure of the hot water storage type water heater External perspective view of the hot water storage water heater Sectional drawing which shows the structure of the other pressure-reduction valve part in the hot water storage type water heater

Explanation of symbols

13 Pressure reducing valve unit 17 Pressure adjusting spring 18 Pressure reducing valve body 20 Outlet 21 Inlet hole 22 Strainer body 26 Check valve seat

Claims (3)

A pressure reducing valve unit, and the pressure reducing valve pressure reducing valve body fitted with units, the a strainer for body attached to the body pressure reducing valve, the body pressure reducing valve, a substantially cylindrical shape with opposite open ends form, whereas Attach the pressure reducing valve unit to an end, only set the check Me valve at the other end, a primary inlet for water to flow into the pressure reducing valve unit, the secondary-side outlet for water to flow out And a pressure adjusting spring that varies the degree of opening of the secondary side outlet according to the water pressure, and on the side surface of the pressure reducing valve body facing the primary side inlet into which water provided in the pressure reducing valve unit flows , An inlet hole that communicates with the strainer body is provided , and the strainer body is provided with a pressure receiving spring that relieves water pressure. The opening of the inlet hole is smaller than the opening area at both ends of the pressure reducing valve body, and the spring coefficient of the pressure receiving spring Is the key Hot-water storage type water heater, characterized in that it has a larger than the spring coefficient of the spring. 2. The check valve has a seat, a spring, and a spring receiving portion, the pressure reducing valve body has a seal rib at a position in close contact with the seat of the check valve, and the pressure reducing valve body and the seal rib are integrally configured. The hot water storage water heater described in 1. The strainer body has a cylindrical shape with both ends open, one end is a water supply pipe connection port, the other end is provided with a detachable cylindrical strainer mounting part, and the inlet hole of the pressure reducing valve body is provided on the side surface. The hot water storage type water heater according to claim 1 or 2, further comprising a communication hole that communicates, wherein an opening of the communication hole is smaller than an opening area of both ends of the strainer body.

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