JP6529337B2 - Valve device and hot water storage type hot water supply device - Google Patents

Description

  An embodiment of the present invention relates to a valve device and a hot water storage type hot water supply device provided with the valve device.

  BACKGROUND In recent years, a hot water storage type hot water supply apparatus has been widely used, in which tap water is stored in a tank and the water is boiled using inexpensive nighttime electric power. In such a hot water storage type hot water supply apparatus, the pressure in the tank is large so that the pressure in the tank is not negative and the negative pressure is not broken when the amount of hot water supply is too large for the water supply to the tank to catch up. A negative pressure operating valve is provided which opens when the pressure decreases to a set value (see Patent Document 1 below).

  In addition, when residual water is generated in the negative pressure operation valve during installation of the hot water storage type hot water supply device until delivery to the customer is completed or when hot water in the tank is drained, the remaining water remains The freezing of the water may cause the negative pressure operating valve to break down. Such freeze breakage is more likely to occur when the negative pressure operating valve is molded of resin in order to reduce the cost of the storage hot water supply apparatus.

JP 2011-72367 A

  However, the negative pressure operating valve described in Patent Document 1 has a structure provided with a spring that biases the valve body to the valve closing position with a constant biasing force. Then, when the pressure in the tank decreases to the set value, the valve body slides to the valve opening position against the biasing force of the spring. And the residual water countermeasure in this negative pressure operation valve is not considered in particular.

  An object of the embodiment of the present invention is to provide a negative pressure operating valve for preventing a tank for storing hot water from having a negative pressure failure and a valve capable of easily removing residual water of the negative pressure operating valve. An apparatus and a hot water storage type hot water supply device provided with its valve device.

The valve device according to the embodiment includes a valve accommodating portion having continuous first flow path piping and second flow path piping that can be connected to piping through which fluid flows , and is formed in the valve accommodation portion to form the first flow path piping Alternatively, it is branched from any one of the second flow path pipes, and is accommodated in the third flow path pipe having an opening at the tip end, and the third flow path pipe, and is directed toward the tip end portion in the third flow path pipe A valve body slidable to a valve-closing position for closing the opening and closing the opening, and a valve-opening position for moving the opening in the opposite direction to the tip end direction, and housed in the third flow path piping, It has a spring which biases a valve body towards a part direction, and a valve rod which is provided in the valve body and whose tip part extends from the opening to the outside of the third flow path pipe .

It is a system diagram of a hot water storage type hot water supply apparatus. It is a sectional view showing the structure of the 1st valve device. (A) is a cross-sectional view when the valve body of the negative pressure operation valve is located at the valve closing position, (b) is a cross-sectional view when the valve body of the negative pressure operation valve is located at the valve opening position. It is sectional drawing which shows the relationship between 3rd flow-path piping and a valve stem.

  Hereinafter, an embodiment will be described based on the drawings. FIG. 1 is a system diagram of a heat pump type hot water storage type hot water supply apparatus 1. The hot water storage type hot water supply apparatus 1 includes a heat pump unit 2 which is a heating apparatus, a tank unit 3 and a control unit 4. A bath 5 is connected to the hot water storage type hot water supply device 1 as one of hot and cold water using units to which hot and cold water (hot water and water) is supplied, and hot water supply conditions for the bath 5 in the bathroom 6 in which the bath 5 is installed. A remote control 7 for setting etc. is provided. The control unit 4 has a CPU, a ROM, a RAM, etc., and controls each component of the hot water storage type hot water supply apparatus 1. For example, the on / off control of the operation of the heat pump unit 2 is provided in the tank unit 3. It performs on / off control of a circulation pump (described later), switching control of a switching valve (described later) provided in the tank unit 3, and the like.

  The heat pump unit 2 includes a compressor 8 for compressing a refrigerant, a heat exchanger 9 on the heat radiation side for condensing the compressed refrigerant, an expansion valve 10 for expanding the condensed liquid refrigerant, and vaporization of the expanded refrigerant. And a heat exchanger 11 on the heat absorption side. In the heat exchanger 9 on the heat radiation side, a refrigerant pipe 12 through which the refrigerant flows is piped, and a hot water pipe 13 through which the hot water flows is piped.

  The tank unit 3 includes a tank 14 in which hot and cold water is stored, a water supply pipe 16 connected between the water pipe 15 and the lower part of the tank 14 for supplying tap water into the tank 14, and an upper part of the tank 14 The supply piping 17 connected between the hot water and the water use unit (for example, the bathtub 5, the washroom, the kitchen, etc.), and the first piping 18 connected between the lower portion of the tank 14 and the inlet side of the heat exchanger 9. , A second pipe 19 connected between the outlet side of the heat exchanger 9 and the upper portion of the tank 14, a bathtub supply pipe 20 branched from the middle of the supply pipe 17 and connected to the bathtub 5, and the supply pipe After being branched from the middle of 17 and passing through the heat exchanger 21 for reheating, the refueling tank side piping 22 connected to the vertical center of the tank 14 and one end thereof are connected to the bathtub 5 for reheating After passing through the heat exchanger 21, the other end is provided with a bathtub. And a reheating tub side pipe 23 connected to the pipe 20. A plurality of temperature sensors 24 for detecting the temperature of the hot and cold water in the tank 14 are attached to the tank 14 along the vertical direction of the tank 14. These temperature sensors 24 are connected to the control unit 4 to transmit the detected temperature to the control unit 4.

  In the lower part of the tank 14, as described above, the water supply pipe 16 for supplying tap water into the tank 14 and the first pipe 18 for supplying hot and cold water in the tank 14 to the heat exchanger 9 of the heat pump unit 2. And are connected. Furthermore, a discharge pipe 25 for discharging the hot and cold water in the tank 14 to the outside of the tank 14 is connected to the lower part of the tank 14. Further, an expansion water discharge pipe 26 for discharging expansion water is connected to the upper portion of the tank 14. On the lower side of the tank 14 in the water supply pipe 16, a first valve device 27 for preventing negative pressure breakage and high pressure breakage of the tank 14 is provided. A second valve device 28 is provided at the lower part of the discharge pipe 25 and at the lower part of the expansion water discharge pipe 26 for draining hot water discharged from the tank 14 toward the drain and taking hot water in the tank 14. ing.

  A supply mixing valve 29 is provided in the middle of the supply pipe 17 for mixing the hot water extracted from the upper part of the tank 14 with the tap water supplied via the water supply pipe 16 to adjust the temperature. Hot and cold water whose temperature is controlled by the mixing valve 29 for supply is supplied to the hot and cold water using unit (for example, a washroom, a kitchen, etc.). The supply mixing valve 29 is connected to the control unit 4, and opening degree adjustment is performed in accordance with an instruction from the control unit 4.

  In the middle of the first pipe 18, a first temperature sensor 30 is provided which detects the temperature of the hot water entering the heat exchanger 9. In the middle of the second pipe 19, a second temperature sensor 31 is provided which detects the temperature of hot and cold water that passes through the heat exchanger 9 and exits the heat exchanger 9. The first and second temperature sensors 30 and 31 are connected to the control unit 4 and transmit the detected temperature to the control unit 4.

  Furthermore, a circulation pump 32 is provided in the middle of the first pipe 18. The circulation pump 32 takes out the hot and cold water in the tank 14 from the lower side of the tank 14 and passes the hot and cold water taken out through the inside of the first pipe 18 and the hot and cold water pipe 13 of the heat exchanger 9 and the inside of the second pipe 19. Water and return it to the top in the tank 14.

  A return pipe 33 is provided between the second pipe 19 and the first pipe 18 to return the hot and cold water flowing in the second pipe 19 to the first pipe 18. Furthermore, in the middle of the second pipe 19, a switching valve 34 is provided to switch whether the hot and cold water flowing in the second pipe 19 is led to the upper part in the tank 14 or to the return pipe 33. The switching valve 34 is connected to the control unit 4, and switching control is performed in accordance with an instruction from the control unit 4.

  A bathtub mixing valve 35 and a solenoid valve 36 are provided in the middle of the bathtub supply piping 20 to mix the hot water extracted from the upper part of the tank 14 and the tap water supplied via the water supply piping 16 and adjust the temperature. It is done. Hot and cold water whose temperature has been adjusted by the mixing valve 35 for the bath is supplied to the bath tub 5. The bathtub mixing valve 35 is connected to the control unit 4, and the opening degree adjustment is performed in accordance with an instruction from the control unit 4. The solenoid valve 36 is connected to the control unit 4 and is opened when a supply instruction to the bath 5 is given.

  A refueling tank pump 37 is provided in the middle of the refueling tank pipe 22. The refueling tank pump 37 takes out the hot water from the upper part of the tank 14 and returns the taken out hot water to the inside of the tank 14 via the reheating heat exchanger 21.

  A refueling bathtub side pump 38 is provided in the middle of the refueling bathtub side piping 23. The refueling bathtub side pump 38 takes out the hot and cold water in the bathtub 5 and returns the taken out hot and cold water to the inside of the bathtub 5 through the reheating heat exchanger 21.

  The first valve device 27 is provided in the middle of the water supply pipe 16 and, as shown in FIG. 2, includes a valve housing 39, and the valve housing 39 includes first to fourth four flow pipes 40 and 41. , 42, 43. As indicated by the arrows, the tap water supplied into the tank 14 via the water supply pipe 16 flows from the first flow path pipe 40 into the valve accommodating portion 39 and flows out from the second flow path pipe 41. It has become.

  The third flow path pipe 42 prevents the pressure in the tank 14 and in the first to third flow path pipes 40, 41, 42 communicating with the inside of the tank 14 from becoming negative pressure lower than a set value. A negative pressure valve 44 is attached. The negative pressure operating valve 44 has a valve main body 45 capable of sliding between the valve closing position and the valve opening position in the third flow path pipe 42 having an opening, and the valve main body 45 in the valve closing direction (third flow And a valve rod 47 provided on one end side of the valve main body 45 and extending to the outside of the valve accommodating portion 39. The end of the valve main body 45 on the side where the valve rod 47 is provided is in contact with the inner circumferential surface of the distal end side edge portion 48 of the third flow path pipe 42 when the valve main body 45 is located at the valve closing position. An O-ring 49 for closing the third flow path pipe 42 is attached.

  The valve rod 47 is provided with a pressing portion 50 at a tip end portion of the third flow path pipe 42 that extends to the outside. The surface area of the pressing portion 50 is larger than the cross-sectional area of the valve rod 47 in the direction orthogonal to the sliding direction (longitudinal direction) of the valve rod 47, and the surface is formed smoothly. Moreover, the cross-sectional shape of the valve rod 47 in the direction orthogonal to the sliding direction of the valve rod 47 is formed in a polygonal shape having a cross shape.

  In the fourth flow path pipe 43 having an opening, the pressure in the tank 14 and in the first to third flow path pipes 40, 41, 42 communicating with the inside of the tank 14 becomes a high pressure higher than the set value. An overpressure protection valve 51 is attached to prevent the In the fourth flow path piping 43, the overpressure protection valve 51 can slide the second valve main body 52 capable of sliding between the valve closing position and the valve opening position, and the second valve main body 52 in the valve closing direction (fourth flow A spring 53 for urging the inner side of the passage pipe 43 and a closing cap attached to the tip of the fourth passage pipe 43 so as to prevent the second valve main body 52 from coming off the fourth passage pipe 43 And 54. At one end of the second valve main body 52, when the second valve main body 52 is located at the valve closing position, the fourth flow is brought into contact with the inner circumferential surface of the back side edge 55 of the fourth flow path piping 43 An O-ring 56 for closing the road piping 43 is provided.

  FIG. 3 is a cross-sectional view showing a state in which the valve body 45 in the negative pressure operation valve 44 is located at the valve closing position and the valve opening position. As shown in FIG. 3A, when the valve main body 45 is located at the valve closing position, the O-ring 49 of the valve main body 45 is in contact with the inner circumferential surface of the distal end side edge portion 48 of the third flow path pipe 42 The third flow path pipe 42 is closed. As shown in FIG. 3B, when the valve main body 45 is located at the valve opening position, the O-ring 49 of the valve main body 45 separates from the tip end side edge portion 48 of the third flow path pipe 42, and the third flow The road piping 42 is open.

  FIG. 4 is a cross-sectional view showing the relationship between the third flow path pipe 42 and the valve rod 47. As shown in FIG. Between the inner peripheral portion of the third flow path pipe 42 and the outer peripheral portion of the valve rod 47, a gap 57 through which air or water can pass is formed.

  In such a configuration, in the hot water storage type hot water supply apparatus 1, the tap water is stored in the tank 14, and the stored tap water in the tank 14 is heated by the heat pump unit 2 to become hot water, and the hot water in the tank 14 Is supplied to the bathtub 5 and other hot water using parts.

  Here, at the time of operation of the storage type hot water supply apparatus 1, when the usage amount of hot water in the hot water using unit is large and the supply of tap water into the tank 14 can not catch up, the pressure in the tank 14 gradually decreases. Do.

  When the pressure in the tank 14 and in the first to third flow passage pipes 40, 41, 42 communicating with the inside of the tank 14 decreases to a set value, the pressure in the tank 14 and the biasing force of the spring 46 Based on the relationship with the atmospheric pressure, the valve main body 45 of the negative pressure actuating valve 44 located at the valve closing position shown in FIG. 3A slides to the valve opening position shown in FIG. 3B.

  When the valve main body 45 slides to the valve opening position, the O-ring 49 of the valve main body 45 separates from the inner circumferential surface of the distal end side edge portion 48 of the third flow path pipe 42 and the third flow path pipe 42 is opened. When the third flow path pipe 42 is opened, external air flows into the valve accommodating portion 39 through the gap 57 between the inner peripheral portion of the third flow path pipe 42 and the outer peripheral portion of the valve rod 47. The inflowing air flows out of the second flow path pipe 41 and flows into the tank 14 via the water supply pipe 16. In this way, when the pressure in the tank 14 decreases to the set value, external air flows into the tank 14 to reduce the pressure in the tank 14 to the set value or less, and the tank 14 becomes negative. It is prevented that it is destroyed by force. When the valve body 45 slides to the valve opening position, the hot and cold water in the valve accommodating portion 39 is drained to the outside through the third flow path pipe 42.

  In addition, after hot water supply type hot water supply device 1 is installed and trial operation is performed until delivery to the customer is completed, or when the hot and cold water in tank 14 is drained, the valves in valve housing 39 and water supply piping 16 Residual water is likely to be generated in the vicinity of the portion connected to the housing portion 39. When such residual water is generated, the residual water may freeze in cold weather, and the negative pressure operating valve 44 and the water supply pipe 16 may cause freeze destruction. Therefore, after installing the storage type hot water supply apparatus 1 and performing test operation, until the delivery to the customer is completed, or when the hot and cold water in the tank 14 is drained, the pressing portion 50 of the valve rod 47 is finger-operated. The valve body 45 is slid to the valve opening position by pushing. When the valve body 45 slides to the valve opening position, residual water in the vicinity of the valve housing 39 and the portion of the water supply pipe 16 connected to the valve housing 39 is the inner peripheral portion of the third flow path pipe 42 and the valve Water can be drained through the gap 57 between the rod 47 and the outer periphery. As a result, residual water is generated in the valve housing 39 or in the vicinity of a portion of the water supply pipe 16 connected to the valve housing 39, and the negative pressure operating valve 44 or the water supply pipe by freezing the residual water. 16. Freezing destruction is prevented.

  Here, the pressing portion 50 provided on the valve rod 47 has a surface area larger than the cross-sectional area of the valve rod 47 in the direction orthogonal to the sliding direction of the valve rod 47, and the surface is formed smoothly. There is. Therefore, when the pressing portion 50 is pushed with a finger to slide the valve body 45 to the valve opening position, the valve rod 45 can easily slide the valve body 45 without biting into the finger. Further, since it is possible to make the valve rod 47 thinner, the gap 57 between the inner peripheral portion of the third flow path pipe 42 and the outer peripheral portion of the valve rod 47 can be made while achieving downsizing of the negative pressure operating valve 44. It can be taken large. As a result, it is possible to improve the water draining performance performed through the gap 57 between the inner peripheral portion of the third flow path pipe 42 and the outer peripheral portion of the valve rod 47 and the air suction performance.

  Further, since the cross-sectional shape of the valve rod 47 in the direction orthogonal to the sliding direction of the valve rod 47 is formed in a cruciform polygonal shape, the strength of the valve rod 47 can be increased. Furthermore, the cross-sectional shape of the valve rod 47 is formed in a cross-like polygonal shape, so that the surface tension of the hot and cold water in the gap 57 can be easily broken when the valve rod 47 is slid. Performance can be improved.

  When the pressure in the tank 14 rises to the set value, the second valve main body 52 of the overpressure protection valve 51 is closed based on the relationship between the pressure in the tank 14 and the biasing force of the spring 53 and the atmospheric pressure. Slide to the open position. When the second valve main body 52 slides to the valve opening position, the O-ring 56 of the second valve main body 52 separates from the inner circumferential surface of the back side edge 55 of the fourth flow path pipe 43 and the fourth flow path pipe 43 To be released. When the fourth flow path pipe 43 is released, a part of the hot and cold water in the tank 14 is released from the fourth flow path pipe 43, and the tank 14 and the tank 14 communicate with one another. The pressure in the flow path piping 40, 41, 42 is prevented from rising above the set value, and the tank 14 is prevented from being destroyed at high pressure.

  Here, in the first valve device 27, since the negative pressure operation valve 44 and the overpressure protection valve 51 are accommodated in one valve accommodation portion 39, the negative pressure operation valve 44, which is two types of valves, Since the pressure prevention valves 51 can be installed together, the installation space of the valves can be reduced, and the number of parts for these valves can be reduced. Furthermore, since the operation inspection of the negative pressure operation valve 44 and the overpressure prevention valve 51 can be continuously performed, the time and effort required for the operation inspection can be reduced.

  While the embodiments of the present invention have been described above, the embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

DESCRIPTION OF SYMBOLS 2 ... Heat pump unit (heating apparatus), 5 ... Bathtub (hot-water use part) 14, 14 ... Tank, 16 ... Water supply piping (piping), 17 ... Supply piping, 39 ... Valve accommodating part, 40-42 ... Flow-path piping, 45 ... valve body, 47 ... valve stem,

Claims (5)

A valve housing portion having continuous first flow path piping and second flow path piping, which can be connected to piping in which fluid flows;
A third flow path pipe formed in the valve storage portion and branched from any one of the first flow path pipe and the second flow path pipe, and having an opening at a tip end portion;
The valve is accommodated in the third flow path pipe, moved in the direction of the tip end portion in the third flow path pipe, and moved in the opposite direction to the valve closing position for closing the opening portion and the tip end portion direction. A valve body slidable to a valve opening position for opening the opening;
A spring which is accommodated in the third flow path pipe and biases the valve main body toward the tip end portion;
A valve rod provided in the valve body and having a tip end extending out of the opening to the outside of the third flow path pipe;
A valve device characterized by having. The valve stem, the valve device according to claim 1, wherein the surface area of the distal end portion is formed larger than the cross-sectional area in the direction orthogonal to the sliding direction of the valve stem. The valve device according to claim 1 or 2, wherein a cross-sectional shape in a direction orthogonal to the sliding direction of the valve rod is formed in a polygonal shape. Are slidably received between a closed position and the open position in the valve housing section, wherein the first and to slide open position when the pressure in the first and second flow path in the pipe is increased The valve device according to any one of claims 1 to 3 , further comprising a second valve main body that discharges the hot and cold water in the second flow path piping to the outside. With piping where hot and cold water flows,
With a tank where hot and cold water is stored,
A heating device connected to the tank to heat hot and cold water in the tank;
The valve device according to any one of claims 1 to 4 , connected to the pipe.
Supply piping in which hot and cold water in the tank is supplied toward a hot and cold water using unit;
A hot water storage type hot water supply apparatus characterized by comprising.

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