JP6570777B1 - Drainage system - Google Patents

Abstract

Disclosed is a drainage system capable of suitably discharging water accumulated in a factory or the like with a simpler configuration. A drainage system according to an embodiment of the present invention includes a steam ejector and a temperature sensitive valve provided in a steam flow path in which the steam ejector is disposed. The temperature sensing valve 16 includes a housing H that defines a valve channel 24 that communicates with the channel 18, a temperature sensing operation unit 26 provided in the housing, and a valve channel that can be opened and closed. And a valve main body 28 configured to move in accordance with the operation of the temperature-sensitive operation unit. [Selection] Figure 1

Description

  The present invention relates to a drainage system for automatically discharging water staying in a pit installed in a factory, for example.

  Patent Document 1 discloses an example of a drainage system that automatically drains water staying in a pit installed in a factory or the like. The drainage system of Patent Document 1 includes a jet pump configured to draw up water in a pit by steam supplied as a driving fluid. The supply of steam to the jet pump is controlled by an air-operated steam gate valve. The supply of compressed air to the steam gate valve is controlled by an air control mechanism. The air control mechanism opens at a water level above a predetermined upper limit height and supplies compressed air to the steam gate valve, and opens at a water level below a predetermined lower limit height and compresses from the steam gate valve. It consists of a lower limit float valve that discharges air. When the water level rises, the lower limit float valve is closed and the upper limit float valve is opened, whereby compressed air is supplied to the steam gate valve. As a result, the balloon body of the steam gate valve expands and the valve opens, so that steam is supplied to the jet pump.

Japanese Patent Laid-Open No. 10-331799

  However, in the drainage system described in Patent Document 1, it is necessary to interlock two valves, a steam gate valve and an air control valve, for supplying steam to the jet pump, and a simpler configuration is desired. Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a drainage system capable of suitably discharging water accumulated in a factory or the like with a simpler configuration.

In order to achieve the above object, one embodiment of the present invention provides:
With a steam ejector,
A temperature sensing valve provided in a steam flow path in which the steam ejector is disposed,
The temperature sensing valve is
A housing for defining and forming a valve flow path communicating with the flow path;
A temperature sensitive operating part provided in the housing;
A valve body provided to be able to open and close the valve flow path and configured to move in accordance with the operation of the temperature-sensitive operation unit;
Provide a drainage system.

  Preferably, the temperature sensitive operation unit includes a temperature sensing unit and an expansion / contraction unit connected to the valve body while expanding and contracting according to the temperature sensed by the temperature sensing unit.

  The temperature sensing operation unit may be provided so that at least a part of the temperature sensing operation unit is immersed in water when the water level in which the water stays at a predetermined location is equal to or higher than the predetermined water level.

  According to the drainage system concerning the above-mentioned one mode of the present invention, the water collected in the factory etc. can be discharged suitably by simpler composition.

It is a schematic structure figure of the drainage system concerning one embodiment of the present invention. It is a cross-sectional schematic diagram of the temperature sensitive valve in the drainage system of FIG. 1, and is a figure showing the state which the valve flow path closed. It is a cross-sectional schematic diagram of the temperature sensitive valve in the drainage system of FIG. 1, and is a figure showing the state which the valve flow path opened.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. The same parts (or configurations) are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a diagram showing an overall configuration of a drainage system 10 according to an embodiment of the present invention. The drainage system 10 is configured to discharge the water staying in the pit 12 of a factory or the like according to the water level. The drainage system 10 has a configuration in which water in the pit 12 is pumped by steam supplied as a driving fluid. Specifically, the drainage system 10 includes a steam ejector 14 and a temperature sensitive valve 16.

  The steam ejector 14 is provided in the steam flow path 18, and a part of the steam supplied to, for example, factory equipment can be supplied thereto. The supply source of steam flowing through the drainage system 10, that is, the steam source does not exclude the provision of a device unique to the drainage system 10, but may be a steam source normally used in factories or the like. For example, the steam source is a boiler that is a steam generator. A part of the steam from the steam source is supplied to the flow path 18 and can be supplied to the steam ejector 14.

  The steam ejector 14 has a well-known structure that sucks another fluid by utilizing the entrainment effect of the high-speed flow of the steam that is the driving fluid. Here, the steam ejector 14 has a known configuration having a nozzle, a diffuser and a suction chamber. The steam ejector 14 is connected to a suction flow path 14a connected to the suction chamber. As shown in FIG. 1, the suction channel 14 a extends from the steam ejector 14 downward in the vertical direction toward the pit 12.

  In the drainage system 10, the steam ejector 14 is provided at a predetermined position with respect to the pit 12 in which rain water, industrial water, or the like can be accumulated. Normally, the steam ejector 14 is installed at a position where it is not immersed in the water staying in the pit 12, more specifically, at a position that is a predetermined distance (second predetermined distance) D2 away from the bottom 12b of the pit 12 in the vertical direction. Yes. In FIG. 1, a support mechanism such as the steam ejector 14 is not shown.

  A temperature sensitive valve 16 is arranged on the upstream side of the steam ejector 14, particularly immediately on the upstream side. The temperature sensitive valve 16 is also installed so as not to be immersed in water staying in the pit 12 when the water level of the pit 12 is lower than the predetermined water level D1. The predetermined water level D1 corresponds to the water surface being at a first predetermined distance away from the bottom 12b of the pit 12 in the vertical direction, and is shorter than the second predetermined distance D2. The temperature sensitive valve 16 will be described in detail later.

  A pressure reducing valve 20 is provided in the portion 18 a of the flow path 18 upstream of the temperature sensing valve 16. The steam source is connected to a portion 18 b of the flow path 18 on the upstream side of the pressure reducing valve 20. The pressure reducing valve 20 is provided so that the pressure of the steam flowing toward the temperature sensing valve 16 is set to a predetermined pressure or less. For example, the pressure of the vapor is reduced to 0.3 MPa or less by the pressure reducing valve 20 and, for example, to 0.2 MPa or more. The pressure reducing valve 20 may be an automatic valve or a manual valve. For controlling the pressure reducing valve 20, a pressure gauge may be provided in the flow path 18a.

  A steam trap 22 is provided in the branch flow path 18 c branched from the portion 18 a of the flow path 18. The steam trap 22 is directed to discharging only drain (condensed water) from the steam in the flow path 18, that is, the steam atmosphere, and is a kind of automatic valve configured to prevent the steam from leaking as much as possible. A known steam trap 22 may be used. In addition, the gate valve 23 is provided in the upstream of the steam trap 22, and the flow volume of drain is adjustable. The gate valve 23 may not be provided.

  The temperature sensing valve 16 is provided in the flow path 18 through which the steam flows in this way, here, immediately upstream of the steam ejector 14. The temperature sensing valve 16 will be described with reference to FIGS.

  The temperature sensing valve 16 includes a housing H that partitions and forms a valve channel 24 that communicates with the channel 18, a temperature sensing operation unit 26 that is provided in the housing H, and a valve body 28 that is provided so that the valve channel 24 can be opened and closed. With. The valve body 28 is configured to move in accordance with the operation of the temperature sensitive operation unit 26.

  In the temperature sensing valve 16, the housing H is constituted by assembling six housing members H1, H2, H3, H4, H5, and H6 by screwing or the like. An O-ring or the like is used as appropriate. As will be apparent from FIGS. 2 and 3, the housing H is assembled so that the temperature-sensitive actuator 26 and the valve body 28 are incorporated therein. Since the housing H has a substantially cylindrical shape, the temperature sensing valve 16 has a substantially cylindrical shape and has a central axis 16A.

  The housing H of the temperature sensitive valve 16 defines a valve flow path 24 connected to the flow path 18. The valve flow path 24 includes an inlet flow path 24 a extending along the central axis 16 and an outlet flow path 24 b extending from the central axis 16 in a substantially radial direction. A valve seat 30 is formed between the inlet channel 24 a and the outlet channel 24 b of the valve channel 24. In FIG. 2, the valve body 28 is seated on the valve seat 30 and closes the valve flow path 24. In FIG. 3, the valve body 28 is separated from the valve seat 30 and the valve flow path 24 is open.

  As will be described later, the valve main body 28 is connected to the expansion / contraction part 36 of the temperature-sensitive operation part 26 and can move along the axis 16A in the housing H, but the movable space S1 is the fifth housing member H5. And a sixth housing member H6 screwed thereto. The sixth housing member H6 has a valve seat 30. The first and second housing members H1 and H2 are provided so as to cover and fix the fifth and sixth housing members H5 and H6 from the outside. Note that the fifth housing member H5 is configured such that the inlet channel 24a and the outlet channel 24b, that is, the hole p7 formed in the first housing member H1, can communicate with each other through the holes p5 and p6 formed in the fifth housing member H5. A space S2 is formed between the first housing member H1 and the first housing member H1.

  In the central axis 16 </ b> A direction of the temperature sensing valve 16, a temperature sensing operation unit 26 is provided in a portion in the housing H opposite to the valve flow path 24 side. The temperature sensitive operation part 26 is sandwiched and held between the fifth housing member H5 and the fourth housing member H4 screwed to the fifth housing member H5, and the periphery thereof is covered by the third housing member H3. The third housing member H3 is attached to the second housing member H2 located on the outer peripheral side of the fifth housing member. Since the third housing member H3 has a plurality of holes p1, p2, p3, p4 and a space S3 between the third housing member H3 and the temperature-sensitive operation part 26, the temperature-sensitive operation part 26 includes a hole in the housing H. A fluid that has passed through p1, p2, p3, and p4 to reach the space S3, particularly water here, can come into contact.

  The temperature sensitive operation unit 26 includes a temperature sensing unit 32, a main body unit 34, and an expansion / contraction unit 36. The main body 34 is configured integrally with the temperature sensing unit 32 and can be regarded as a part of the temperature sensing unit 32. As shown in FIGS. 2 and 3, the temperature sensing unit 32 is exposed to the space S3 and can be in direct contact with water. The expansion / contraction unit 36 is configured to expand / contract to the temperature sensed by the temperature sensing unit 32 according to, for example, the temperature of water. More specifically, the expansion / contraction part 36 is configured such that the amount of protrusion from the temperature sensing part 32 or the main body part 34 is variable according to the temperature sensed by the temperature sensing part 32. In the case of FIG. 2, the protruding amount of the expansion / contraction part 36 is larger than that in the case of FIG. A valve body 28 is connected to the distal end of the extendable portion 36. The valve main body 28 moves in the space S1 along the central axis 16A according to the expansion / contraction of the expansion / contraction part 36. That is, when the expansion / contraction part 36 extends (that is, when the protruding amount increases), the valve body 28 approaches the valve seat 30 and is seated in some cases. Further, the expansion and contraction portion 36 is contracted (that is, the protruding amount is reduced), whereby the valve main body 28 is separated from the valve seat 30.

  As shown in FIG. 1, the temperature sensing valve 16 is provided so that at least a part thereof protrudes vertically downward from the steam ejector 14. In the use state of FIG. 1, the temperature sensing valve 16 has its center axis 16 </ b> A substantially extending in the vertical direction, and the temperature sensing unit 32 of the temperature sensing operation unit 26 is positioned downward in the vertical direction. Provided. That is, in the state of FIG. 1, at least the temperature sensing unit 32 of the temperature sensing operation unit 26 extends below the steam ejector 14 in the vertical direction.

  As such a temperature sensitive operation part 26, the thermo element by Nippon Thermostat Co., Ltd. can be used, for example. The expansion amount, that is, the protrusion amount of the expansion / contraction part 36 of the thermo element is determined by the temperature sensed by the temperature sensing unit 32, and the state of the expansion / contraction part 36 changes due to the thermal expansion of the built-in wax, more specifically, paraffin wax. . Note that another product or the like may be used as the temperature sensitive operation unit 26.

  The effect of the drainage system 10 provided with the said structure is demonstrated.

  When water does not stay much in the predetermined pit 12 and the water level staying there is less than the predetermined water level D1, the water does not reach the temperature sensing unit 32 of the temperature sensing valve 16, and the temperature is detected. The valve 16 is steam that has passed through the flow path 18 and is at a predetermined temperature or higher. At this time, the protruding amount of the expansion / contraction part 36 of the temperature sensing valve 16 is large, for example, the maximum, and the valve body 28 is in a state in which the valve flow path 24 is closed as shown in FIG. Therefore, the steam does not flow or hardly flows in the steam ejector 14, the steam ejector 14 is not activated, and the water in the pit 12 is not pumped up.

  On the other hand, when water stays in the pit 12 and the water level becomes equal to or higher than the predetermined water level D1, the water passes through the holes p1, p2, p3, and p4 of the housing H of the temperature sensing valve 16 and reaches the space S3. 16 temperature sensing parts 32 are contacted. Thereby, the temperature sensing unit 32 is cooled by water, and as a result, the protruding amount of the expansion / contraction part 36 is greatly reduced. As a result, the valve body 28 connected to the tip of the telescopic part 36 leaves the valve seat 30 and the valve flow path 24 opens. As a result, the steam enters from the inlet channel 24a, exits from the outlet channel 24b through the holes p5, p6, and p7 formed in the first and fifth housings H1 and H5 of the housing H, and then the steam ejector 14 (See arrow in FIG. 3). As a result, water is sucked up in the steam ejector 14, and the sucked-up water is discharged into the drain groove 40 (see the arrow in FIG. 1).

  As described above, in this embodiment, the temperature sensing valve 16 is provided in the flow path 18 where the steam ejector 14 is provided, and when the amount of the accumulated water is increased, it is automatically operated by contact with the water. The steam ejector 14 can be activated. Therefore, the drainage system 10 can discharge water accumulated in a factory or the like with a simpler configuration than the conventional drainage system described in Patent Document 1.

  As mentioned above, although typical embodiment and the modification of this invention were demonstrated, this invention can be variously changed. Various substitutions and modifications may be made without departing from the spirit and scope of the present invention as defined by the claims of this application.

  For example, in the above embodiment, the temperature sensing valve 16 is provided on the upstream side of the steam ejector 14, but the present invention does not exclude that it is provided on the downstream side thereof.

DESCRIPTION OF SYMBOLS 10 Drainage system 12 Pit 14 Steam ejector 16 Temperature sensing valve 18 Flow path 20 Pressure reducing valve 22 Steam trap 26 Temperature sensing operation part 32 Temperature sensing part 36 Extension part

Claims (3)

With a steam ejector,
A temperature sensing valve provided in a steam flow path in which the steam ejector is disposed,
The temperature sensing valve is
A housing for defining and forming a valve flow path communicating with the flow path;
A temperature-sensitive operation unit provided in the housing, the temperature-sensitive operation unit arranged so as to be in contact with a drainage target ;
A valve body provided to be able to open and close the valve flow path and configured to move in accordance with the operation of the temperature-sensitive operation unit;
Drainage system. The temperature-sensitive operation unit includes a temperature sensing unit, and an expansion / contraction unit that expands and contracts according to the temperature sensed by the temperature sensing unit and is connected to the valve body.
The drainage system according to claim 1. The temperature sensitive operation part is provided so that at least a part of the temperature sensitive operation part is immersed in water when the water level in which the water stays at a predetermined location is equal to or higher than the predetermined water level,
The drainage system according to claim 1 or 2.

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