JP2018071663A - Solenoid valve and beverage supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic valve and a beverage supply device in which the inside of the electromagnetic valve can be sufficiently sterilized in a short time. SOLUTION: An electromagnetic valve 10 of the present invention includes a valve box 11, an inlet port 11a through which a beverage flows into the valve box 11, an outlet port 11b through which the beverage flows out from the valve box 11, an inlet port 11a and an outlet port 11b. Between the movable core portion 13 accommodated in the valve box 11, the seal portion 19 provided on one end side of the movable core portion 13 to close the outlet port 11 b, and the outlet port provided on the other end side of the movable core portion 13. And a spring 17 that biases the seal portion 19 so as to close 11b. The electromagnetic valve 10 includes one or a plurality of grooves (port-to-port flow paths) 13a formed in the movable iron core portion 3 and a circulation port 11d, and the inlet port in the state where the seal portion 19 closes the outlet port 11b. The sterilizing medium flows between the 11a and the circulation port 11c through one or a plurality of grooves 13a. [Selection] Figure 1

Description

  The present invention relates to an electromagnetic valve capable of sterilizing a seal portion in a closed state, and a beverage supply device such as a water server provided with the electromagnetic valve.

  Conventionally, a water server which is a beverage supply device has a tank for storing drinking water in a piping system, and as a means for sterilizing the piping system, for heating the drinking water in the tank to a sterilizable temperature. A heating means, a pump for supplying high-temperature water in the tank toward the piping system, and a circulation line for returning the high-temperature water sent to the piping system by the pump to the tank again Has been proposed.

  Such a water server maintains the piping system in a state where microorganisms are not propagated by periodically performing a sterilization process in which high-temperature water is supplied to the piping system by the above-mentioned pump or natural circulation (convection). To do.

  An example of the water server will be described with reference to FIG. The water server 100 includes a drinking water container 102, a cold water tank 103 that receives drinking water dropped from the drinking water container 102, a hot water tank 105 that receives drinking water from the cold water tank 103, and the cold water in the cold water tank 103 as a drinking container A cold water injection unit 107 for injecting water into the hot water tank and a hot water injection unit 120 for injecting hot water in the hot water tank 105 into a beverage container or the like. The hot water tank 105 is provided with a heater (not shown), and the cold water tank 103 is provided with a cooler (not shown). The cold water injection unit 107 of the water server 100 is provided with an electromagnetic valve 110 shown in FIG.

  As shown in FIG. 8, the electromagnetic valve 110 includes a body portion 111. The body portion 111 is connected to an inlet port 111a into which drinking water flows, a valve box 111d connected to the inlet port 111a, and a valve box 111d. Outlet port 111b.

  The electromagnetic valve 110 includes a diaphragm (valve element) 119 that is disposed in the valve box 111d and opens and closes a conduit between the inlet port 111a and the outlet port 111b, a movable core portion 113 that is connected to the diaphragm 119, and a movable iron core. A coil portion 115 for moving the portion 113 by magnetic force, a spring 117 for urging the movable core portion 113 and the diaphragm 119 toward the valve seat 111e, and a water injection port portion 118 connected to the outlet port 111b.

  As shown in FIG. 8, when the electromagnetic valve 110 is closed, the seal surface 119a of the diaphragm 119 is seated on the valve seat 111e, thereby blocking the flow before and after the valve seat 111e. In this state, hot water for sterilization flows from the circulation port 111c of the solenoid valve 110 to the inlet port 111a. However, in such a structure of the solenoid valve 110, hot water does not flow to the vicinity of the seal surface 119a of the diaphragm 119 when washing the circulating water, so it took time to increase the temperature to the temperature required for sterilization of the solenoid valve. . Furthermore, a space is formed below the outer peripheral portion 119b of the diaphragm 119 where hot water is not in direct contact, and it took time to increase to a temperature necessary for sterilization in this space.

International Publication No. 2012/165775 JP 2013-180803 A

  As shown in FIG. 8, since the flow path at the time of hot water cleaning does not pass through the main part of the electromagnetic valve (the seal surface 119a of the diaphragm 119, the outer peripheral part 119b), it takes time to sterilize the electromagnetic valve, so that energy efficiency is improved. It is getting worse. Furthermore, the outer peripheral part of the diaphragm which is not in direct contact with hot water has a space, and in particular, the energy efficiency for sterilization in this space is poor.

  An object of the present invention is to provide an electromagnetic valve and a beverage supply device that can sufficiently sterilize the inside of the electromagnetic valve and have high sterilization efficiency.

In order to solve the above problems, the present invention is configured as follows.
(Aspect 1) A valve box, an inlet port for flowing beverage into the valve box, an outlet port for flowing beverage from the valve box, and a movable housed in the valve box between the inlet port and the outlet port A center portion, a seal portion provided on one end side of the movable core portion and closing the outlet port, and a seal portion provided on the other end side of the movable core portion and biasing the seal portion so as to close the outlet port. An electromagnetic valve comprising an urging member, wherein the electromagnetic valve is connected to the inter-port flow path for allowing a beverage to flow between the inlet port and the outlet port, and to the inter-port flow path on the outlet port side. A solenoid port, wherein the sterilization medium flows between the inlet port and the circulation port via the inter-port flow path in a state where the seal portion closes the outlet port. (Aspect 2) In the electromagnetic valve according to aspect 1, the inter-port flow path is one or a plurality of grooves formed on the inner surface of the valve box or the outer surface of the movable core, or the inner surface of the body portion And a solenoid valve, which is a space formed between the outer surfaces of the movable core. (Aspect 3) The electromagnetic valve according to aspect 1 or 2, wherein the circulation port is provided on a side wall of the valve box adjacent to the outlet port. (Aspect 4) The electromagnetic valve according to any one of aspects 1 to 3, wherein the circulation port is arranged at a predetermined angle with respect to a longitudinal direction of the electromagnetic valve.

  (Aspect 5) In the electromagnetic valve according to any one of aspects 1 to 4, the valve box includes a large-diameter pipe part that accommodates the movable core part so as to be movable forward and backward, and a diameter of the large-diameter pipe part. Is a solenoid valve larger than the diameter of the inlet port and / or the outlet port. (Aspect 6) In the electromagnetic valve according to any one of aspects 1 to 5, the movable core portion is a movable iron core portion, and the electromagnetic valve includes a coil portion for moving the movable iron core portion by a magnetic force. ,solenoid valve. (Aspect 7) The electromagnetic valve according to any one of aspects 1 to 6, wherein the biasing member is a spring, and the electromagnetic valve includes an accommodating portion that accommodates the spring. (Aspect 8) In the electromagnetic valve according to aspect 7, the accommodating portion is a concave accommodating portion provided on the other end side of the movable core portion, and the spring is interposed between the inlet port and the concave accommodating portion. Is accommodated, solenoid valve. (Aspect 9) In the electromagnetic valve according to aspect 8, the recess-shaped accommodating portion is provided with one or a plurality of slits, and the inter-port flow path and the inlet port communicate with each other through the slits. valve. (Aspect 10) In the electromagnetic valve according to aspect 7, the electromagnetic valve includes an extension pipe portion that extends from the inlet port into the valve box, and the storage portion includes the extension pipe portion and the valve box. An electromagnetic valve, which is an annular housing portion formed between them. (Aspect 11) The electromagnetic valve according to aspect 10, wherein the extension pipe portion is provided with one or more slits, and the inter-port flow path and the inlet port communicate with each other through the slits. .

(Aspect 12) The electromagnetic valve according to Aspect 10 or 11, wherein the extension pipe portion is provided with an opening at an end thereof, and the inter-port passage and the inlet port are communicated with each other through the opening. (Aspect 13) The electromagnetic valve according to any one of aspects 1 to 12, wherein the circulation port is provided at a lower portion of the valve box. (Aspect 14) The electromagnetic valve according to any one of aspects 1 to 13, wherein the sterilizing medium is hot water. (Aspect 15) A beverage supply device comprising the electromagnetic valve according to any one of aspects 1 to 14. (Aspect 16) The beverage supply apparatus according to Aspect 15, wherein a heating member is provided in a pipe line connected to the circulation port or the inlet port. (Aspect 17) In the beverage supply device according to Aspect 16, the sterilization medium generated by heating the heating member in a state where the seal portion closes the outlet port, through the circulation port or the inlet port, A beverage supply device supplied into the solenoid valve. (Aspect 18) In the beverage supply device according to Aspect 16 or 17, the sterilizing medium is supplied into the electromagnetic valve via the circulation port or the inlet port by convection generated by heating the heating member. Beverage supply device. (Aspect 19) A beverage supply apparatus according to any one of aspects 15 to 18, comprising a circulation line for circulating a sterilizing medium through the electromagnetic valve. (Aspect 20) A water server, which is the beverage supply apparatus according to any one of aspects 15 to 19. (Aspect 21) The water server according to aspect 20 is a water server including the electromagnetic valve on the cold water supply unit side.

  The present invention can reliably sterilize the inside of the solenoid valve when the solenoid valve is closed. Furthermore, according to the present invention, the periphery of the seal portion, the groove portion, and the urging member can be reliably sterilized with the electromagnetic valve closed.

It is sectional drawing of the closed state of the solenoid valve which concerns on the 1st Embodiment of this invention. It is sectional drawing of the open state of the solenoid valve of FIG. It is sectional drawing of the closed state of the solenoid valve which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the open state of the solenoid valve of FIG. It is a block diagram which shows the 1st circulation line which has a solenoid valve of 1st Embodiment. It is a block diagram which shows the 2nd circulation line which has the solenoid valve of 1st Embodiment. It is a schematic diagram which shows the water supply structure of the conventional water server. It is sectional drawing of the solenoid valve used for the conventional water server.

  Each embodiment which applied the solenoid valve and drink supply device of the present invention to the solenoid valve for water servers and the water server will be described below. In addition, the water supply structure of the water server of each embodiment of the present invention is the same as that of the water server of FIG. 7, but includes an electromagnetic valve of each embodiment described later instead of the electromagnetic valve of the water server of FIG. 7. The electromagnetic valve and water server of each embodiment of the present invention have an electromagnetic valve that can sterilize the periphery of the seal portion of the electromagnetic valve when the flow path is sterilized.

(First embodiment)
A water server solenoid valve according to a first embodiment of the present invention will be described with reference to FIGS. The solenoid valve 10 includes a valve box 11 that houses a valve body such as a seal part 19 to be described later and that forms a flow path that is opened and closed by the seal part 19, and the valve box 11 includes an inlet port 11a into which drinking water flows. , An outlet port 11b through which drinking water flows out, a circulation port 11c through which a sterilizing medium (hot water, hot water, or a sterilizing agent) circulates, and a large-diameter pipe portion 11d communicating with each port are provided. In the valve box 11, the inlet port 11a, the large-diameter pipe portion 11d, and the outlet port 11b are linearly arranged, and the circulation port 11c has a predetermined angle with respect to the longitudinal direction of the electromagnetic valve 10 on the outlet port 11b side. It is connected to the large diameter pipe portion 11d. The predetermined angle may preferably be in the range of 45 degrees to 135 degrees, more preferably in the range of 80 degrees to 100 degrees, and even more preferably substantially perpendicular. The inner diameter of the large diameter pipe portion 11d is formed larger than the inner diameter of each port. As shown in FIGS. 1 and 2, the circulation port 11c is provided on the side wall of the valve box 11 adjacent to the outlet port 11b.

  The electromagnetic valve 10 is in contact with the inner surface of the large-diameter tube portion 11d and can move forward and backward along the longitudinal direction thereof, and one end (left end) of the movable iron core portion 13 in the large-diameter tube portion 11d. Provided on the outer side of the large-diameter pipe portion 11d, a seal portion 19 that can close the outlet port 11b, a return spring (biasing member) 17 that urges the movable core portion 13 toward the outlet port 11b, and the like. The coil part 15 for moving the movable core part 13 by magnetic force is provided. The spring 17 is provided between the other end (right end) of the movable core 13 and the inlet port 11a.

  The seal portion 19 is formed in a disk shape from a flexible member such as rubber. The diameter of the seal part 19 is smaller than the diameter of the movable core part 13 and larger than the opening diameter of the outlet port 11b. The movable iron core portion 13 has an elongated cylindrical shape, and one or a plurality of groove portions 13a through which water can flow along the longitudinal direction is formed on the outer peripheral curved surface. The inter-port flow path connecting the inlet port 11a and the outlet port 11b is configured by the groove 13a. One or a plurality of groove portions may be formed along the longitudinal direction on the inner surface of the large-diameter pipe portion 11d instead of the outer surface of the movable iron core portion 13. Furthermore, you may comprise the flow path between ports by forming space from the inlet port to an outlet port between the inner surface of the valve box 11 and the outer surface of the movable iron core part 13 without forming a groove part. At the other end (the right end in FIG. 1) of the movable core portion 13, a concave accommodating portion 13 b that accommodates the spring 17 is formed. A plurality of slits 13c through which water can be circulated are formed in a portion of the movable core portion 13 where the groove portion 13a and the accommodating portion 13b overlap.

  The flow of the sterilization medium when the electromagnetic valve 10 is closed will be described. As shown in FIG. 1, the electromagnetic valve 10 is in a closed state in which the movable iron core portion 13 and the seal portion 19 are advanced and the seal portion 19 closes the outlet port 11b. In this closed state, a sterilization medium (hot water, hot water, or a sterilizing agent) can be flowed in a forward flow or a reverse flow. Specifically, when the sterilization medium flows into the inlet port 11a of the electromagnetic valve 10 as a forward flow, the sterilization medium is contained in the housing portion 13b, the plurality of slits 13c, the plurality of groove portions 13a, the periphery of the seal portion 19, and the circulation port 11c. It flows in sequence, flows out of the solenoid valve 10, and circulates through a circulation line to be described later. Further, when the sterilization medium flows into the circulation port 11c of the solenoid valve 10 as a reverse flow, the sterilization medium flows in the order of the periphery of the seal portion 19, the plurality of groove portions 13a, the plurality of slits 13c, the housing portion 13b, and the inlet port 11a. It flows out of the electromagnetic valve 10 and circulates through a circulation line to be described later. In the first embodiment, the sterilization medium can be made to flow only in the forward flow, only in the reverse flow, or alternately switched between the forward flow and the reverse flow.

  Next, the flow of drinking water when the electromagnetic valve 10 is open will be described. As shown in FIG. 2, the solenoid valve 10 is in an open state in which the movable core portion 13 and the seal portion 19 are retracted and the seal portion 19 opens the outlet port 11b. In this open state, when drinking water (cold water) flows from a cold water tank (not shown) into the inlet port 11a of the electromagnetic valve 10, the drinking water is surrounded by the accommodating portion 13b, the plurality of slits 13c, the plurality of grooves 13a, and the seal portion 19. , And then flows out from the outlet port 11b to the outside of the solenoid valve 10 (cold water injection section). In addition, since the pipe line connected to the circulation port 11c is closed by a valve (not shown), the drinking water does not flow out to the circulation port 11c side.

(Second Embodiment)
A solenoid valve 20 according to a second embodiment will be described with reference to FIGS. The electromagnetic valve 20 includes a valve box (body part) 21 that houses a valve body such as a seal part 29, which will be described later, and constitutes a flow path that is opened and closed by the seal part 29, and drinking water flows into the valve box 21. An inlet port 21a, an outlet port 21b through which drinking water flows out, a circulation port 21c through which a sterilizing medium (hot water, hot water, or a sterilizing agent) circulates, and a large-diameter pipe portion 21d communicating with each port are provided. In the valve box 21, the inlet port 21a, the large-diameter pipe portion 21d, and the outlet port 21b are arranged in a straight line, and the circulation port 21c is on the outlet port 21b side with respect to the longitudinal direction of the electromagnetic valve 10. And connected to the large-diameter pipe portion 21d. Further, as shown in FIGS. 3 and 4, the circulation port 21c is provided on the side wall of the valve box 21 adjacent to the outlet port 21b.

  The electromagnetic valve 20 is in contact with the inner surface of the large-diameter pipe portion 21d and can move forward and backward along the longitudinal direction thereof, and one end (left end) of the movable iron core portion 23 in the large-diameter pipe portion 21d. Provided on the outer side of the large-diameter pipe portion 21d, a seal portion 29 that can close the outlet port 21b, a return spring (biasing member) 27 that urges the movable core portion 23 toward the outlet port 21b. The coil part 25 for moving the movable core part 23 by magnetic force is provided. The spring 27 is provided between the other end (right end) of the movable core portion 23 and the inlet port 21a in the large-diameter pipe portion 21d.

  The seal portion 29 is formed in a disk shape from a flexible member such as rubber. The seal part 29 further has a flange part 29a, and the diameter of the flange part 29a is smaller than the diameter of the movable core part 23 and larger than the diameter of the outlet port 21b. The movable iron core portion 23 has an elongated cylindrical shape, and one or a plurality of groove portions 23a through which water can flow along the longitudinal direction are formed on the outer peripheral curved surface. The inter-port flow path connecting the inlet port 21a and the outlet port 21b is configured by the groove 23a. One or more grooves may be formed not on the outer surface of the movable core portion 23 but on the inner surface of the large-diameter pipe portion 21d. Furthermore, you may comprise the channel between ports by forming a space from the inlet port to the outlet port between the inner surface of the valve box 21 and the outer surface of the movable core portion 23 without forming the groove portion. On the other end (right end in FIG. 3) side of the movable core part 23, an extension pipe part 21a1 is provided that extends the pipe line of the inlet port 21a into the large diameter pipe part 21d. An annular space formed between the outer surface of the extension tube portion 21a1 of the inlet port 21a and the inner surface of the large diameter tube portion 21d constitutes a housing portion 21e that houses the spring 27. An opening 21 a 2 is formed on the end surface of the extension pipe portion 21 a 1 that faces the movable core portion 23. One or more slits 21a3 are formed around the extension pipe part 21a1 in parallel with the longitudinal direction of the large diameter pipe part 21d. The opening 21a2 and the slit 21a3 allow water to flow between the inlet port 21a and the inside of the large diameter pipe portion 21d.

  The flow of the sterilization medium when the electromagnetic valve 20 is closed will be described. As shown in FIG. 3, the electromagnetic valve 20 is in a closed state in which the movable iron core portion 23 and the seal portion 29 are advanced and the seal portion 29 closes the outlet port 21 b. In this closed state, a sterilizing medium (hot water, hot water, or a sterilizing agent) for sterilization can be flowed in a forward flow or a reverse flow. Specifically, when the sterilization medium flows into the inlet port 21a of the solenoid valve 20 as a forward flow, the sterilization medium is in the order of the periphery of the opening 21a2, the plurality of slits 21a3, the accommodating portion 21e, the plurality of groove portions 23a, and the seal portion 29. The flow flows out of the electromagnetic valve 20 and circulates through a circulation line described later. Further, when the sterilization medium flows into the circulation port 21c of the electromagnetic valve 20 as a reverse flow, the sterilization medium flows around the seal portion 29, the plurality of groove portions 23a, the accommodating portion 21e, the opening 21a2, the plurality of slits 21a3, and the inlet port 21a. It flows in sequence, flows out of the electromagnetic valve 20, and circulates through a circulation line to be described later. Also in the second embodiment, the sterilization medium can be made to flow only in the forward flow, only in the reverse flow, or alternately switched between the forward flow and the reverse flow.

  Next, the flow of drinking water when the solenoid valve 20 is open will be described. As shown in FIG. 4, the solenoid valve 20 is in an open state in which the movable core portion 23 and the seal portion 29 are retracted and the seal portion 29 opens the outlet port 21b. In this open state, when drinking water (cold water) flows from a cold water tank (not shown) into the inlet port 21a of the electromagnetic valve 20, the drinking water is supplied to the extension pipe portion 21a1, the plurality of slits 21a3, the housing portion 12e, the plurality of groove portions 23a, It passes around the seal portion 29 in order and flows out of the solenoid valve 20 from the outlet port 21b. Since the circulation path connected to the circulation port 21c is closed by a valve (not shown), the drinking water does not flow out to the circulation port 21c side.

(Circulation line)
Next, a state in which the electromagnetic valve 10 of the first embodiment is connected to the circulation line will be described with reference to FIGS. 5 and 6, both of the electromagnetic valves 10 are closed. 5 and 6, the electromagnetic valve 10 of the first embodiment is arranged in each circulation pipe, but the electromagnetic valve 20 of the second embodiment can be similarly arranged in each circulation pipe. is there.

  The circulation line 30 will be described with reference to FIG. The circulation pipe 30 is provided with a heater (heating member) 31 below the pipe connected to the circulation port 11c. Since the solenoid valve 10 is arranged horizontally, the inlet port 11a and the outlet port 11b are arranged in the horizontal direction, and the circulation port 11c faces downward. When sterilization is performed in the circulation pipe 30, when the heater 31 heats the water in the pipe, the water is heated to become a sterilization medium (hot water), and the pipe is raised by convection, so that the circulation port 11 c and the solenoid valve 10 circulates in the order of the inlet port 11a.

  The circulation line 40 will be described with reference to FIG. The circulation pipe 40 is provided with a heater 41 (heating member) below the pipe connected to the circulation port 11c. Since the solenoid valve 10 is arranged vertically, the inlet port 11a and the outlet port 11b are arranged in the vertical direction, and the circulation port 11c faces the horizontal direction. When the sterilization is performed in the circulation pipe 40, when the heater 41 heats the water in the pipe, the water is heated to become a sterilization medium (hot water), and the pipe is raised by convection, so that the circulation port 11c, the electromagnetic valve 10 circulates in the order of the inlet port 11a.

  The circulation line 50 will be described with reference to FIG. The circulation pipe 50 is provided with a heater (heating member) 51 in a pipe branching downward from a pipe connected to the inlet port 11a. Since the solenoid valve 10 is arranged horizontally, the inlet port 11a and the outlet port 11b are arranged in the horizontal direction, and the circulation port 11c faces downward. When sterilization is performed in the circulation pipe 50, when the heater 51 heats the water in the pipe, the water is heated to become a sterilization medium (hot water), and the pipe is raised by convection, so that the inlet port 11a, the solenoid valve 10 circulates in the order of the circulation port 11c.

  The circulation line 60 will be described with reference to FIG. The circulation pipe 60 is provided with a heater (heating member) 61 in a pipe branching downward from a pipe connected to the inlet port 11a. Since the solenoid valve 10 is arranged vertically, the inlet port 11a and the outlet port 11b are arranged in the vertical direction, and the circulation port 11c faces the horizontal direction. When the sterilization is performed in the circulation pipe 60, when the heater 61 heats the water in the pipe, the water is heated to become a sterilization medium (hot water), and the pipe is raised by convection, so that the inlet port 11a, the solenoid valve 10 circulates in the order of the circulation port 11c.

The solenoid valve according to the first and second embodiments of the present invention can circulate the sterilization medium on the entire inner surface of the solenoid valve except the outlet port and the surface of the seal portion on the side closing the outlet port. Therefore, the entire solenoid valve can be efficiently heated to the sterilization temperature in a short time, and an appropriate sterilization effect can be obtained, and energy required for sterilization can be reduced as compared with the conventional case.
In addition, in 1st and 2nd embodiment of this invention, although the water server which supplies water was described as a drink supply apparatus provided with the solenoid valve 10 or 20, this invention is not limited to a water server, For example, You may apply to the drink supply apparatus which supplies a soft drink. Furthermore, in 1st and 2nd embodiment of this invention, although the solenoid valve 10 or 20 was provided in the drink supply apparatus, it is not limited to this, The liquid supply which supplies the arbitrary liquid which is not a drink to the said solenoid valve It can also be provided in the device.

DESCRIPTION OF SYMBOLS 10 Solenoid valve 11 Valve box 11a Inlet port 11b Outlet port 11c Circulation port 11d Large diameter pipe part 13 Movable iron core part 13a Groove part (flow path between ports)
13b Slit 15 Coil part 17 Spring (biasing member)
19 Seal (valve)
20 Solenoid valve 21 Valve box 21a Inlet port 21b Outlet port 21c Circulation port 21d Large diameter pipe part 21a1 Extension pipe part 21a2 Opening 21a3 Slit 23 Movable core part 25 Coil part 27 Spring (biasing member)
29 Seal (valve)
29a Flange part 30 Circulation line 31 Heater (heating member)
40 Circulating line 41 Heater (heating member)
50 Circulation line 51 Heater (heating member)
60 Circulation line 61 Heater (heating member)

Claims (21)

A valve box, an inlet port through which the beverage flows into the valve box, an outlet port through which the beverage flows out from the valve box, a movable core housed in the valve box between the inlet port and the outlet port, A seal portion provided on one end side of the movable core portion and closing the outlet port; and a biasing member provided on the other end side of the movable core portion and biasing the seal portion so as to close the outlet port; A solenoid valve comprising:
The solenoid valve includes an inter-port passage for flowing a beverage between the inlet port and the outlet port, and a circulation port connected to the inter-port passage on the outlet port side,
An electromagnetic valve in which a sterilizing medium flows between the inlet port and the circulation port via the inter-port flow channel with the seal portion closing the outlet port.   2. The electromagnetic valve according to claim 1, wherein the inter-port flow path is one or a plurality of grooves formed on an inner surface of the valve box or an outer surface of the movable core portion, or an inner surface of the body portion and the movable portion. A solenoid valve, which is a space formed between the outer surfaces of the core.   The electromagnetic valve according to claim 1 or 2, wherein the circulation port is provided on a side wall of the valve box adjacent to the outlet port.   4. The solenoid valve according to claim 1, wherein the circulation port is disposed at a predetermined angle with respect to a longitudinal direction of the solenoid valve.   The solenoid valve according to any one of claims 1 to 4, wherein the valve box includes a large-diameter pipe portion that accommodates the movable core portion so as to freely advance and retract, and the diameter of the large-diameter pipe portion is the A solenoid valve larger than the diameter of the inlet port and / or said outlet port.   6. The electromagnetic valve according to claim 1, wherein the movable core portion is a movable iron core portion, and the electromagnetic valve includes a coil portion for moving the movable iron core portion by a magnetic force. .   The solenoid valve according to claim 1, wherein the biasing member is a spring, and the solenoid valve includes a housing portion that houses the spring.   8. The electromagnetic valve according to claim 7, wherein the accommodating portion is a concave accommodating portion provided on the other end side of the movable core portion, and the spring is accommodated between the inlet port and the concave accommodating portion. The solenoid valve.   9. The electromagnetic valve according to claim 8, wherein the recessed housing portion is provided with one or a plurality of slits, and the inter-port flow path and the inlet port are communicated with each other through the slits.   8. The electromagnetic valve according to claim 7, wherein the electromagnetic valve includes an extension pipe portion extending from the inlet port into the valve box, and the accommodating portion is formed between the extension pipe portion and the valve box. An electromagnetic valve that is an annular housing portion.   The electromagnetic valve according to claim 10, wherein the extension pipe portion is provided with one or a plurality of slits, and the inter-port passage and the inlet port communicate with each other through the slits.   The electromagnetic valve according to claim 10 or 11, wherein the extension pipe portion has an opening at an end thereof, and the inter-port flow path and the inlet port are communicated with each other through the opening.   The solenoid valve according to any one of claims 1 to 12, wherein the circulation port is provided at a lower portion of the valve box.   The electromagnetic valve according to any one of claims 1 to 13, wherein the sterilizing medium is hot water.   A beverage supply device comprising the electromagnetic valve according to any one of claims 1 to 14.   The beverage supply apparatus according to claim 15, further comprising a heating member in a pipe line connected to the circulation port or the inlet port.   17. The beverage supply device according to claim 16, wherein the sterilizing medium generated by heating the heating member in a state where the seal portion closes the outlet port causes the electromagnetic valve to pass through the circulation port or the inlet port. Beverage supply device supplied inside.   The beverage supply apparatus according to claim 16 or 17, wherein the sterilization medium is supplied into the electromagnetic valve via the circulation port or the inlet port by convection generated by heating the sterilizing medium. Feeding device.   The beverage supply device according to any one of claims 15 to 18, comprising a circulation pipe for circulating a sterilizing medium through the electromagnetic valve.   The water server which is a drink supply apparatus as described in any one of Claims 15-19.   The water server according to claim 20, wherein the electromagnetic valve is provided on the cold water supply unit side.