Drain trap

Abstract

To provide a drain trap that enables downsizing of the structure of a device, including a structure for measures in an emergency.SOLUTION: A drain trap includes: a strainer chamber 102; a drain storage chamber 101; a drain inlet hole 103 leading to the strainer chamber 102; a passage 104 between a strainer and a drain; a drain discharge passage 109; a final outlet side flow passage 114; a solenoid valve 200; a valve chamber upward passage 112; a valve chamber downward passage 115; and a drain bypass passage 116. The strainer chamber 102, the drain storage chamber 101, the passage 104 between the strainer and the drain, the drain discharge passage 109, a drain final outlet hole 113, the final outlet side flow passage 114, the valve chamber upward passage 112, the valve chamber downward passage 115 and the drain bypass passage 116 are disposed in a die-cast block 100 made of metal or resin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a drain trap. [Background technology]

[0002] In conventional drain traps with a drain storage chamber, the water level in the drain storage chamber is detected by a float-type level switch (reed switch), and the water is discharged using a normally closed solenoid valve.

[0003] Patent Document 1 discloses a drain trap that divides a drain tank into a drain inlet chamber and a drain discharge chamber, allows drain to flow into the drain inlet chamber, and discharges the drain from the drain inlet chamber to the drain discharge chamber via a discharge elbow. This drain trap has a control unit, a sensor connected to the control unit, and a solenoid valve whose opening and closing is controlled by the control unit. The sensor measures the amount of drain stored in the drain discharge chamber, and the control unit controls the opening and closing operation of the solenoid valve based on the sensor measurement, and the solenoid valve operates to discharge the drain to the outside.

[0004] Patent Document 2 discloses a drain trap (auto drain trap). The drain trap (auto drain trap) includes a cylindrical drain pot, a drain sensor, and a solenoid valve, and a signal output cable is connected to the drain sensor.

[0005] In this drain trap, drain flowing down the drain pipe flows into the drain pot, where it accumulates. When the accumulated amount reaches the detection level, the drain sensor detects it and opens the solenoid valve. When the solenoid valve opens, the accumulated drain is released all at once into the drain pot, discharging the accumulated drain. If the accumulated drain is discharged normally, it will not accumulate to the detection level until a reference time has passed. However, if there is a drain discharge defect in the drain trap or drain pipe, causing accumulated drain to remain, the accumulated drain will accumulate to the detection level in a time shorter than the reference time. In such a case, the drain sensor outputs a drain discharge defect signal. This drain discharge defect signal is output to the control device via a signal output cable. When the control device receives the drain discharge defect signal from the drain detector, it will stop the air compressor or sound an alarm, just as it would if it received a drain detection signal from the drain detector.

[0006] Patent Document 3 shows a drain trap used in a compressed air dehumidifier. This drain trap directly detects when the drain water inside the double pipe is full and opens and closes a solenoid valve. A water volume detection sensor that detects when the drain water is full is placed inside the outer pipe of the double pipe and connected to a control unit. When the water volume detection sensor detects that the drain water is full, the control unit determines that a predetermined condition is met and controls the solenoid valve to open and close. In this case, in the predetermined condition determination process, the control unit controls the solenoid valve to open when the water volume detection sensor detects that the drain water is full. By controlling in this way, the drain water is not discharged from the double pipe until it is full, so the refrigerant can be cooled without wasting the cold energy of the drain water.

[0007] Patent Document 4 discloses a drain trap including a flow path housing made of a metal or resin block in which flow paths for compressed air and drain are formed, a solenoid valve provided integrally with the flow path housing at a first position of the flow path housing and for stopping, starting, or continuing the flow of compressed air and drain through the flow paths, and a strainer provided in the flow path of the flow path housing. Patent Document 5 describes that when the air compressor is powered on, the electromagnetic valve closes, and when the power is turned off at the end of the day, the electromagnetic valve of the drain trap opens. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 7359478 specification [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-140028 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-12426 [Patent Document 4] Patent No. 7016066 specification [Patent Document 5] Japanese Patent Application Publication No. 08-247036 Summary of the Invention [Problem to be solved by the invention]

[0009] In conventional drain traps, a bypass line is provided for the discharge line in case the device becomes unable to discharge drain due to a malfunction or the like, and this bypass line is used to discharge drain in an emergency.

[0010] When adopting the above-mentioned configuration, a separate bypass line is often prepared and attached externally, which increases the size of the device and requires careful sealing of the connection parts.

[0011] The present invention was made to solve the problems of conventional drain traps as described above, and its purpose is to provide a drain trap that can respond appropriately to emergencies such as power outages, and that can reduce the size of the device's configuration, including the components for emergency measures. [Means for solving the problem]

[0012] A drain trap according to an embodiment of the present invention includes a strainer chamber, a drain storage chamber, a drain inlet hole leading to the strainer chamber, a strainer-drain passage leading from the strainer chamber to the drain storage chamber, a drain discharge passage for discharging the drain stored in the drain storage chamber from the drain storage chamber, a drain final outlet hole for finally discharging the drain to the outside and a final outlet-side flow path leading to the drain final outlet hole, an electromagnetic valve provided between the drain discharge passage and the final outlet-side flow path and controlling whether or not the drain in the drain discharge path flows to the drain final outlet hole, and a valve chest ascending passage leading from the strainer chamber to the valve chest of the solenoid valve, a valve chest descending passage leading the drain from the valve chest of the solenoid valve to the final outlet side flow passage, and a drain bypass passage branching from the drain discharge passage and leading the drain to the outside via the final outlet side flow passage and the drain final outlet hole, wherein the strainer chamber, the drain storage chamber, the strainer-drain passage, the drain discharge passage, the drain final outlet hole, the final outlet side flow passage, the valve chest ascending passage, the valve chest descending passage, and the drain bypass passage are provided in a die-cast block made of metal or resin.

[0013] In the drain trap according to an embodiment of the present invention, the drain storage chamber is characterized in that a bottomed cylindrical recess is formed vertically downward from the upper surface of the die-cast block, and a lid is placed on the upper surface of this recess.

[0014] In the drain trap according to an embodiment of the present invention, the strainer chamber is connected to the cylindrical drain inlet hole formed vertically downward from the upper surface of the die-cast block, and drain flows in through this drain inlet hole.

[0015] In the drain trap according to an embodiment of the present invention, the strainer chamber and the drain storage chamber are formed vertically, while the strainer-drain passage, the drain discharge path, and the drain outlet-side flow path are formed horizontally.

[0016] In the drain trap according to the embodiment of the present invention, a manual shutoff valve is provided in the drain bypass passage.

[0017] In the drain trap according to the embodiment of the present invention, the solenoid valve is a normally open type.

[0018] In the drain trap according to an embodiment of the present invention, a water level measurement sensor is provided in the drain storage chamber, and the opening and closing of the solenoid valve is controlled according to the output of this water level measurement sensor.

[0019] In the drain trap according to an embodiment of the present invention, the water level measurement sensor is characterized by comprising an upper limit water level detection flow sensor and a lower limit water level detection flow sensor.

[0020] The drain trap according to the embodiment of the present invention is characterized in that an upstream solenoid valve is provided on the upstream side of the solenoid valve, and a downstream solenoid valve is provided on the downstream side.

[0021] The drain trap according to an embodiment of the present invention is characterized by comprising a solenoid valve upstream road side valve provided on the solenoid valve side of the connecting point between the drain discharge path and the drain bypass path, upstream of the front solenoid valve, and a solenoid valve downstream road side valve provided downstream of the front solenoid valve.

[0022] The drain trap according to an embodiment of the present invention is characterized by comprising an electromagnetic valve upstream side valve provided between the valve chest upstream side and the drain discharge side, and an electromagnetic valve downstream side valve provided between the valve chest downstream side and the final outlet side flow path. A drain trap according to an embodiment of the present invention is configured so that drain is sent to the drain inlet hole from a drain generating device connected to the drain inlet hole, and so that an operation stop signal notifying the operation of the drain generating device is sent, and is characterized in that it comprises a control unit that controls the opening and closing of the solenoid valve, and a signal receiving unit that receives the operation stop signal sent from the drain generating device, and the control unit controls the solenoid valve to stop opening and closing when the operation stop signal arrives at the signal receiving unit. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a perspective front view of a main part of a drain trap according to a first embodiment of the present invention. [Figure 2] 1 is a transparent plan view of a main part of a drain trap according to a first embodiment of the present invention. [Figure 3] 1 is a left side view showing a main part of a drain trap according to a first embodiment of the present invention in a transparent manner. [Figure 4] 1 is a perspective rear view of a main part of a drain trap according to a first embodiment of the present invention. FIG. [Figure 5] 3 is a cross-sectional view taken along line AA of a main part of the drain trap according to the first embodiment of the present invention shown in FIG. 2. FIG. [Figure 6] FIG. 4 is a BB cross-sectional view of the main part of the drain trap according to the first embodiment of the present invention shown in FIG. 3, showing a state in which a bypass valve is closed. [Figure 7] FIG. 4 is a BB cross-sectional view of the main part of the drain trap according to the first embodiment of the present invention shown in FIG. 3, showing a state in which a bypass valve is open. [Figure 8] 3 is a cross-sectional view taken along line CC of the main part of the drain trap according to the first embodiment of the present invention shown in FIG. 2. FIG. [Figure 9] FIG. 2 is a front view of the strainer element assembly removed from the drain trap according to the first embodiment of the present invention. [Figure 10] FIG. 2 is a diagram showing the internal configuration of a control unit housing provided in the drain trap according to the embodiment of the present invention. [Figure 11] FIG. 2 is a diagram showing the valve arrangement of the drain trap according to the first embodiment of the present invention. [Figure 12] FIG. 6 is a diagram showing a valve arrangement of a drain trap according to a second embodiment of the present invention. [Figure 13] FIG. 6 is a perspective front view of a main part of a drain trap according to a second embodiment of the present invention. [Figure 14] FIG. 6 is a transparent plan view of a main part of a drain trap according to a second embodiment of the present invention. [Figure 15] FIG. 6 is a left side view showing a main part of a drain trap according to a second embodiment of the present invention. [Figure 16] FIG. 6 is a perspective rear view of a main part of a drain trap according to a second embodiment of the present invention. [Figure 17] 15 is a cross-sectional view taken along the line AA of a main part of the drain trap according to the second embodiment of the present invention shown in FIG. 14. [Figure 18] 16 is a BB cross-sectional view of a main part of the drain trap according to the second embodiment of the present invention shown in FIG. 15. [Figure 19] FIG. 10 is a perspective front view of a main part of a system in which a drain generating device is connected to a drain trap according to a third embodiment of the present invention. [Figure 20] FIG. 10 is a diagram showing the internal configuration of a control unit housing provided in a drain trap according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] A drain trap according to an embodiment of the present invention will now be described with reference to the accompanying drawings. In each drawing, identical components are designated by the same reference numerals, and redundant description will be omitted. FIG. 1 is a front view showing a perspective of a main portion of a drain trap according to a first embodiment of the present invention. FIG. 2 is a plan view showing a perspective of a main portion of a drain trap according to the first embodiment of the present invention. FIG. 3 is a left side view showing a perspective of a main portion of a drain trap according to the first embodiment of the present invention. FIG. 4 is a rear view showing a perspective of a main portion of a drain trap according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line AA of the main portion of the drain trap according to the first embodiment of the present invention shown in FIG. 2. FIGS. 6 and 7 are cross-sectional views taken along line BB of the main portion of the drain trap according to the first embodiment of the present invention shown in FIG. 3. FIG. 6 shows a state in which the bypass valve is closed, and FIG. 7 shows a state in which the bypass valve is open. FIG. 8 is a cross-sectional view taken along line CC of the main portion of the drain trap according to the first embodiment of the present invention shown in FIG. 2. FIG. 9 is a front view of a strainer element assembly removed from a drain trap according to the first embodiment of the present invention.

[0025] As shown in the above drawings, the drain passages and the like in the drain trap according to the first embodiment of the present invention are basically formed in a die-cast block 100 made of metal or resin. Block 100 is composed of a rectangular parallelepiped first block 100A in which a drain storage chamber 101 and a strainer chamber 102 are formed, and a rectangular parallelepiped second block 100B that is integral with first block 100A. Second block 100B is smaller in size, with a shorter height and a shorter dimension from front to back than first block 100A.

[0026] A drain storage chamber 101 formed as a cylindrical recess with a bottom extending vertically from top to bottom is provided in approximately the center of the block 100. A cylindrical drain inlet hole 103 extending vertically from top to bottom is formed near the end of the first block 100A. Below this drain inlet hole 103, a cylindrical strainer chamber 102 is formed, drilled from the bottom surface of the first block 100A. The drain inlet hole 103 and the strainer chamber 102 are concentric cylinders that communicate with each other, and the diameter of the drain inlet hole 103 is smaller than the diameter of the strainer chamber 102.

[0027] A strainer-drain passage 104 is formed from a high position in the strainer chamber 102, extending directly to the drain reservoir chamber 101, and the strainer chamber 102 and the drain reservoir chamber 101 are connected via the strainer-drain passage 104. The strainer-drain passage 104 is a hole drilled from the side of the first block 100A facing the second block 100B toward the drain reservoir chamber 101, and the start of the drilling is blocked by a plug 104S. A lid 105 is placed over the upper opening of the drain reservoir chamber 101, blocking and fixing it thereto. A pressure equalizing pipe connection port 106, which functions as a so-called air hole, is formed in the lid 105.

[0028] A strainer element assembly 300 is provided in the strainer chamber 102. As shown in FIG. 9, the strainer element assembly 300 can be configured by attaching a strainer 310 to a strainer cap 320. The strainer 310 can be configured as a cylindrical metal mesh body with both ends open. The strainer 310 is provided in the strainer chamber 102 in a state attached to the strainer cap 320. The strainer cap 320 has a structure in which, for example, a hexagonal bolt head 321 is connected to an extremely short shank 322 of about a few millimeters, and a threaded portion 323 is connected to the shank 322.

[0029] Mounting fixtures 107A and 108A for upper limit detection float 107 and lower limit detection float 108 are provided on the near side and far side of the center of lid 105. Upper limit detection float 107 and lower limit detection float 108 attached to mounting fixtures 107A and 108A hang down within drain reservoir chamber 101.

[0030] A drain discharge path 109 is formed in the lateral direction from a height position near the bottom of the drain reservoir chamber 101 toward the second block 100B. A drain final outlet hole 113 that finally discharges the drain to the outside and a final outlet side flow path 114 that communicates with this drain final outlet hole 113 are formed in the second block 100B. At a first position near the side of the second block 100B, a valve chest upward path 112 is formed that extends upward from the drain discharge path 109 and communicates with a valve chest 210 of the solenoid valve 200.

[0031] A drain final outlet hole 113 for finally discharging drain is drilled at a second position adjacent to the first position, and a final outlet-side flow path 114 is formed, extending from this drain final outlet hole 113 in parallel with the drain discharge path 109 to approximately the center of the drain discharge path 109 and stopping there. As shown in FIG. 5 , a valve chest down path 115 is formed from a valve chest 210 in which a valve element 220 of the solenoid valve 200 is provided, leading to the final outlet-side flow path 114. A connecting path 117 is drilled from the front side of the second block 100B toward the position where the valve chest down path 115 and the final outlet-side flow path 114 intersect, connecting the valve chest down path 115 and the final outlet-side flow path 114. The front side of the second block 100B in the connecting path 117 is blocked by a plug 117S.

[0032] A drain bypass path 116 is formed from the position where the final outlet side flow path 114 ends toward the drain discharge path 109, branching off from the drain discharge path 109 and leading the drain to the outside via the final outlet side flow path 114 and the drain final outlet hole 113. The outlet portion of the drain discharge path 109 is closed by a plug 109S.

[0033] The solenoid valve 200 is provided between the drain discharge passage 109 and the final outlet-side flow path 114, and controls whether or not the drain in the drain discharge passage 109 flows to the drain final outlet hole 113. In the first embodiment, the solenoid valve 200 can be of a normally open type. A manual shutoff valve 120 is provided in the drain bypass passage 116, and in a normal state, the drain bypass passage 116 is closed by the manual shutoff valve 120, but in the event of a power outage or other abnormality, a handle 121 of the manual shutoff valve 120 is manually operated to open the drain bypass passage 116. However, in the first embodiment, since the solenoid valve 200 is of a normally open type, drain discharge is reliably performed even in an emergency such as a power outage.

[0034] A control unit housing 400 is provided on the side of the first block 100A. The control unit housing 400 houses a control unit 800 (shown in FIG. 10 ), which is configured with a digital or analog circuit. The control unit 800 controls the opening and closing of the solenoid valve 200 by controlling the valve opening and closing based on signals from the upper limit detection float 107 and the lower limit detection float 108. LEDs 431, 432, and 433, which are display means for displaying the operating status of the drain trap according to the first embodiment, are provided on the top surface of the control unit housing 400. As shown in FIG. 10 , a bus 810 extends from the control unit 800, and a solenoid valve interface 820, an input interface 830, and a display interface 840 are connected to the bus 810. The solenoid valve 200 is connected to the solenoid valve interface 820, and the control unit 800 controls the solenoid valve interface 820 to control the opening and closing of the solenoid valve 200. The upper limit detection float 107 and the lower limit detection float 108 are connected to the input interface 830. The control unit 800 controls the opening and closing of the solenoid valve 200 in accordance with the signals sent from the upper limit detection float 107 and the lower limit detection float 108 as follows: When the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), the control unit 800 controls the opening of the solenoid valve 200. When the amount of drain decreases and the upper limit detection float 107 detects the absence of drain (OFF) and the lower limit detection float 108 detects the absence of drain (OFF), the control unit 800 controls the closing of the solenoid valve 200. However, when the lower limit detection float 108 detects the absence of drain (OFF), this does not mean that the drain has been completely discharged from the drain reservoir chamber 101, but rather that the drain discharge path 109 is filled with drain up to the ceiling of the drain discharge path 109. Therefore, air loss caused by air escaping from the drain outlet of a compressor or the like connected to the drain inlet hole 103 and escaping from the drain reservoir chamber 101 can be reduced to zero. Display means such as LEDs 431, 432, and 433 are connected to the display interface 840, and the control unit 800 can control the display of the display means by controlling the display interface 840. The display means, LEDs 431, 432, and 433, are used for the following displays and notifications: LED 431 can be configured to light up in red when drain discharge failure occurs due to a malfunction of the solenoid valve 200, etc. LED 432 can be configured to light up in orange when drain discharge is in progress or in a test state. LED 433 can be configured to light up in green when the system is in operation.

[0035] As described above, in the drain trap according to the first embodiment, drain and air reach the strainer element assembly 300 from the drain outlet of a compressor or the like connected to the drain inlet hole 103, where foreign matter is removed and the drain and air are sent to the drain storage chamber 101 through the strainer-drain passage 104. In the first embodiment, the solenoid valve 200 is normally open, and the valve is closed when power is applied. When the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), the solenoid valve 200 is opened. When the solenoid valve 200 is opened, the orifice opens as shown in FIG. 5, and the air flows from the strainer-drain passage 104 to the valve chest via the valve chest ascending passage 112 as shown in a, then through the valve chest descending passage 115 to the final outlet-side passage 114, and is discharged to the drain final outlet hole 113 (FIG. 6). On the other hand, when the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), if a malfunction occurs in which the solenoid valve 200 is closed, the handle 121 of the manual shutoff valve 120 is manually operated to open the drain bypass path 116. Therefore, as shown in Fig. 7 , the drain is guided from the drain discharge path 109 through the drain bypass path 116 to the final outlet-side flow path 114 and discharged into the drain final outlet hole 113.

[0036] As described above, in the drain trap according to the first embodiment, the strainer chamber 102, the drain storage chamber 101, the strainer-drain passage 104, the drain discharge passage 109, the drain final outlet hole 113, the final outlet side passage 114, the valve chest upward passage 112, the valve chest downward passage 115, and the drain bypass passage 116 are all provided in a die-cast block 100 made of metal or resin, thereby making it possible to provide a compact device, and furthermore, since there is no connection between the various parts, there is no need to worry about drain leakage and stable operation can be ensured.

[0037] In the drain trap according to the first embodiment, as shown in Fig. 11, a manual shutoff valve 120 is provided in the drain bypass path 116 to prepare for the occurrence of a malfunction in which the solenoid valve 200 is closed when the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), as described above. In contrast, in the drain trap according to the second embodiment, as shown in Fig. 12, a solenoid valve upstream roadside valve 510 is provided upstream of the solenoid valve 200, and a solenoid valve downstream roadside valve 520 is provided downstream. When replacing the solenoid valve 200, for example, the solenoid valve upstream roadside valve 510 and the solenoid valve downstream roadside valve 520 can be closed to allow drain to flow.

[0038] A drain trap according to a second embodiment of the present invention will be described below with reference to Figures 13 to 18 of the accompanying drawings. Figure 13 is a front view showing the main parts of the drain trap according to the second embodiment, Figure 14 is a plan view showing the main parts of the drain trap according to the second embodiment, Figure 15 is a left side view showing the main parts of the drain trap according to the second embodiment, Figure 16 is a rear view showing the main parts of the drain trap according to the second embodiment, Figure 17 is a cross-sectional view taken along line AA of the main parts of the drain trap according to the second embodiment shown in Figure 14, and Figure 18 is a cross-sectional view taken along line BB of the main parts of the drain trap according to the second embodiment shown in Figure 15.

[0039] As shown in Figures 13 to 18 above, the drain trap according to the second embodiment has basically the same configuration as the drain trap according to the first embodiment, with the drain passages and the like formed in a die-cast block 100 made of metal or resin. The block 100 is composed of a rectangular parallelepiped first block 100A in which a drain reservoir chamber 101 and a strainer chamber 102 are formed, and a rectangular parallelepiped second block 100B that is integral with the first block 100A. The second block 100B is smaller in size, with a shorter height and a shorter dimension from front to back than the first block 100A.

[0040] A drain storage chamber 101 formed as a cylindrical recess with a bottom extending vertically from top to bottom is provided in approximately the center of the block 100. A cylindrical drain inlet hole 103 extending vertically from top to bottom is formed near the end of the first block 100A. Below this drain inlet hole 103, a cylindrical strainer chamber 102 is formed, drilled from the bottom surface of the first block 100A. The drain inlet hole 103 and the strainer chamber 102 are concentric cylinders that communicate with each other, and the diameter of the drain inlet hole 103 is smaller than the diameter of the strainer chamber 102.

[0041] A strainer-drain passage 104 is formed from a high position in the strainer chamber 102, extending directly to the drain reservoir chamber 101, and the strainer chamber 102 and the drain reservoir chamber 101 are connected via the strainer-drain passage 104. The strainer-drain passage 104 is a hole drilled from the side of the first block 100A facing the second block 100B toward the drain reservoir chamber 101, and the start of the drilling is blocked by a plug 104S. A lid 105 is placed over the upper opening of the drain reservoir chamber 101, blocking and fixing it thereto. A pressure equalizing pipe connection port 106, which functions as a so-called air hole, is formed in the lid 105.

[0042] A strainer element assembly 300 is provided in the strainer chamber 102. The strainer element assembly 300 is similar to that in the first embodiment described with reference to FIG.

[0043] Mounting fixtures 107A and 108A for upper limit detection float 107 and lower limit detection float 108 are provided on the near side and far side of the center of lid 105. Upper limit detection float 107 and lower limit detection float 108 attached to mounting fixtures 107A and 108A hang down within drain reservoir chamber 101.

[0044] A drain discharge passage 109 is formed in the horizontal direction from a position at a height near the bottom of the drain storage chamber 101 toward the second block 100B. In order to form this drain discharge passage 109, a lead hole 109A is formed in the second embodiment. This lead hole 109A is drilled from the end of the first block 100A and connects in a straight line to the drain discharge passage 109, and the drain discharge passage 109 and the lead hole 109A are formed to have the same diameter. The drain discharge passage 109 terminates at a predetermined position near the solenoid valve 200. A drain final outlet hole 113 that finally discharges the drain to the outside and a final outlet-side flow path 114 that communicates with this drain final outlet hole 113 are formed in the second block 100B. A valve chest upstream path-side communication path 118 is formed from a first position on the side of the second block 100B, passing through the valve chest upstream path 112 of the valve chest 210 of the solenoid valve 200 and reaching a position close to the terminal end of the condensate discharge path 109. The inlet of the valve chest upstream path-side communication path 118 is blocked by a plug 118S. The valve chest upstream path-side communication path 118 and the condensate discharge path 109 are formed in parallel, and the terminal end of the valve chest upstream path-side communication path 118 and the terminal end of the condensate discharge path 109 are connected by a connecting path 119. A solenoid valve upstream path-side valve 510 equipped with a handle 511 is provided upstream of this connecting path 119, and by closing the connecting path 119 with the solenoid valve upstream path-side valve 510, it is possible to create a state in which condensate does not flow to the solenoid valve 200. 2 and 14, it can be seen that most of the drain discharge passage 109 of the first embodiment is the valve chest upflow passage side communication passage 118 of the second embodiment.

[0045] A drain final outlet hole 113 for finally discharging drain is drilled at a second position adjacent to the first position, and a final outlet-side flow path 114 is formed that extends from this drain final outlet hole 113 to near the boundary between the first block 100A and the second block 100B and stops there, parallel to the drain discharge path 109. As shown in Figure 17, a valve chest downward path 115 that leads to the final outlet-side flow path 114 is formed from a valve chest 210 in which a valve element 220 of the solenoid valve 200 is provided.

[0046] A horizontal connecting passage 117Y extending horizontally toward the front side of the second block 100B is connected to the valve chest down passage 115. A vertical connecting passage 117T extending vertically from the bottom surface of the second block 100B is drilled toward the outlet of the horizontal connecting passage 117Y. The vertical connecting passage 117T is connected to the final outlet-side flow passage 114 midway to the outlet of the horizontal connecting passage 117Y. The vertical connecting passage 117T is blocked by a plug 117S on the bottom surface of the second block 100B. Therefore, the drainage that leaves the valve chest 210 and flows down the valve chest down passage 115 can flow from the final outlet-side flow passage 114 via the horizontal connecting passage 117Y and the vertical connecting passage 117T to the final outlet-side flow passage 114.

[0047] The horizontal connecting passage 117Y is formed by drilling from the front side of the second block 100B. A valve stem of a solenoid valve downstream side valve 520 is fitted into a hole that runs from the front of the second block 100B to the outlet of the horizontal connecting passage 117Y. A handle 521 of the solenoid valve downstream side valve 520 is provided on the outside of the valve stem of the second block 100B. The tip of the valve stem forms a valve disc, which can close the outlet of the horizontal connecting passage 117Y. A drain bypass path 116 is formed from the terminal position where the final outlet side flow path 114 abuts toward the drain discharge path 109, branching off from the drain discharge path 109 and directing the drain to the outside via the final outlet side flow path 114 and the drain final outlet hole 113.

[0048] The solenoid valve 200 is provided between the valve chest upstream path-side communication passage 118 and the final outlet-side flow passage 114, and controls whether or not the drain in the valve chest upstream path-side communication passage 118 flows to the drain final outlet hole 113. In the second embodiment, the solenoid valve 200 can be of a normally open type. A manual shutoff valve 120 having a handle 121 is provided in the drain bypass passage 116, and in a normal state, the drain bypass passage 116 is closed by the manual shutoff valve 120, but in the event of a power outage or other abnormality, the handle 121 of the manual shutoff valve 120 is manually operated to open the drain bypass passage 116. However, in the first embodiment, since the solenoid valve 200 is of a normally open type, drain discharge is reliably performed even in an emergency such as a power outage.

[0049] A control unit housing 400 is provided on the side of the first block 100A. The control unit housing 400 houses a control unit 800, which is the same as that of the first embodiment shown in FIG. 10 and is configured with digital or analog circuits. The control unit 800 controls the opening and closing of the solenoid valve 200 by controlling the valve opening and closing based on signals from the upper limit detection float 107 and the lower limit detection float 108. LEDs 431, 432, and 433, which are display means for displaying the operating status of the drain trap according to the second embodiment, are provided on the top surface of the control unit housing 400. As shown in FIG. 10, a bus 810 extends from the control unit 800, and a solenoid valve interface 820, an input interface 830, and a display interface 840 are connected to the bus 810. The solenoid valve 200 is connected to the solenoid valve interface 820, and the control unit 800 controls the solenoid valve interface 820 to control the opening and closing of the solenoid valve 200. The upper limit detection float 107 and the lower limit detection float 108 are connected to the input interface 830. The control unit 800 controls the opening and closing of the solenoid valve 200 in accordance with the signals sent from the upper limit detection float 107 and the lower limit detection float 108 as follows: When the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), the control unit 800 controls the opening of the solenoid valve 200. When the amount of drain decreases and the upper limit detection float 107 detects the absence of drain (OFF) and the lower limit detection float 108 detects the absence of drain (OFF), the control unit 800 controls the closing of the solenoid valve 200. However, when the lower limit detection float 108 detects the absence of drain (OFF), this does not mean that the drain has been completely discharged from the drain reservoir chamber 101, but rather that the drain discharge path 109 is filled with drain up to the ceiling of the drain discharge path 109. Therefore, air loss caused by air escaping from the drain outlet of a compressor or the like connected to the drain inlet hole 103 and escaping from the drain reservoir chamber 101 can be reduced to zero.

[0050] Display means such as LEDs 431, 432, and 433 are connected to the display interface 840, and the control unit 800 can control the display of the display means by controlling the display interface 840. The display means, LEDs 431, 432, and 433, are used for the following displays and notifications: LED 431 can be configured to light up in red when drain discharge failure occurs due to a malfunction of the solenoid valve 200, etc. LED 432 can be configured to light up in orange when drain discharge is in progress or in a test state. LED 433 can be configured to light up in green when the system is in operation. As described above, in the drain trap according to the second embodiment, drain and air reach the strainer element assembly 300 from the drain outlet of a compressor or the like connected to the drain inlet hole 103, where foreign matter is removed and the drain and air are sent to the drain storage chamber 101 through the strainer-drain passage 104. In the first embodiment, the solenoid valve 200 is normally open, and the valve is closed when power is applied. When the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), the solenoid valve 200 is opened. When the solenoid valve 200 is opened, the orifice opens as shown in FIG. 17, and air flows from the strainer-drain passage 104 to the valve chest via the valve chest ascending passage 112 as shown in a, then through the valve chest descending passage 115 to the final outlet-side passage 114, and is discharged to the drain final outlet hole 113 (FIG. 18). On the other hand, when the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), if a malfunction occurs in which the solenoid valve 200 is closed, the handle 121 of the manual shutoff valve 120 is manually operated to open the drain bypass path 116. Therefore, as shown in Fig. 18 , the drain is guided from the drain discharge path 109 through the drain bypass path 116 to the final outlet-side flow path 114 and discharged into the drain final outlet hole 113.

[0051] As described above, in the drain trap according to the second embodiment, the strainer chamber 102, the drain storage chamber 101, the strainer-drain passage 104, the drain discharge passage 109, the drain final outlet hole 113, the final outlet side passage 114, the valve chest upward passage 112, the valve chest downward passage 115, the drain bypass passage 116, and the valve chest upward passage side connecting passage 118 are all provided in a die-cast block 100 made of metal or resin, thereby making it possible to provide a compact device, and furthermore, since there is no connection between the various parts, there is no need to worry about drain leakage and stable operation can be ensured.

[0052] The drain trap according to the second embodiment has a solenoid valve upstream roadside valve 510 provided upstream of the solenoid valve 200 and a solenoid valve downstream roadside valve 520 provided downstream. Therefore, when replacing the solenoid valve 200, the solenoid valve upstream roadside valve 510 and the solenoid valve downstream roadside valve 520 can be closed using handles 511 and 521. In this state, various tasks can be performed without drain flowing into the solenoid valve 200. Furthermore, in this state, drain coming from a drain generating device can be made to flow through the drain bypass path 116, regardless of whether a solenoid valve is present or not.

[0053] Next, a drain trap according to a third embodiment will be described. As shown in Fig. 19, the drain trap according to the third embodiment is configured so that drain (usually drain and air) is sent from a drain generating device 600 (a drain generating device is a pneumatic device that generates drain, such as a compressor) connected to the drain inlet hole 103 to the drain inlet hole 103 via a drain sending path 610, and so that an operation stop signal notifying the stop of operation of the drain generating device 600 is sent. Fig. 19 shows the drain trap of the first embodiment connected to the drain generating device 600, but it goes without saying that the drain trap of the second embodiment may also be configured so that the drain generating device 600 is connected to the drain trap.

[0054] As in the first and second embodiments, the third embodiment also includes a computer-based component centered around a control unit 800, as shown in FIG. 20 . That is, a bus 810 extends from the control unit 800, and a solenoid valve interface 820, an input interface 830, and a display interface 840 are connected to the bus 810. A solenoid valve 200 is connected to the solenoid valve interface 820, and the control unit 800 controls the solenoid valve interface 820 to open and close the solenoid valve 200. An upper limit detection float 107 and a lower limit detection float 108 are connected to the input interface 830. The control unit 800 controls the opening and closing of the solenoid valve 200 in the following manner in response to signals sent from the upper limit detection float 107 and the lower limit detection float 108. When the upper limit detection float 107 detects the presence of drain (ON) and the lower limit detection float 108 detects the presence of drain (ON), the control unit 800 opens and closes the solenoid valve 200. When the amount of drain decreases and the upper limit detection float 107 detects the absence of drain (is OFF) and the lower limit detection float 108 detects the absence of drain (is OFF), the solenoid valve 200 is controlled to close. However, when the lower limit detection float 108 detects the absence of drain (is OFF), this does not mean that the drain has been completely discharged from the drain reservoir chamber 101, but rather that the drain discharge path 109 is filled with drain up to the ceiling of the drain discharge path 109. Therefore, air loss caused by air escaping from the drain discharge port of a compressor or the like connected to the drain inlet hole 103 and escaping from the drain reservoir chamber 101 can be reduced to zero.

[0055] Display means such as LEDs 431, 432, and 433 are connected to the display interface 840, and the control unit 800 can control the display of the display means by controlling the display interface 840. The display means, LEDs 431, 432, and 433, are used for the following displays and notifications: LED 431 can be configured to light up in red when drain discharge failure occurs due to a malfunction of the solenoid valve 200, etc. LED 432 can be configured to light up in orange when drain discharge is in progress or in a test state. LED 433 can be configured to light up in green when the system is in operation.

[0056] In this embodiment, the input interface 830 functions as a signal receiving unit that receives an operation stop signal sent from the drain generating device 600. The control unit 800 of this embodiment performs control so as to stop the opening and closing operation of the solenoid valve 200 when an operation stop signal arrives at the input interface 830, which is the signal receiving unit. As a result, whether the drain generating device 600 is abnormal or normal, when an operation stop signal arrives at the input interface 830, the opening and closing operation of the solenoid valve 200 is stopped. This prevents the solenoid valve 200 from operating when the operation of the drain generating device 600 is stopped, thereby realizing power saving. [Explanation of symbols]

[0057] 100 Block 100A 1st Block 100B 2nd Block 101 Drain Reservoir 102 strainer chamber 103 drain inlet hole 104 Strainer-drain passage 104S Plug 105 Cover 106 Pressure equalizing pipe connection port 107 Upper limit detection float 107A, 108A mounting fixture 108 Lower limit detection float 109 Drain discharge path 109S Plug 112 Valve chest ascending passage 113 Drain final outlet hole 114 Final outlet side flow path 115 Valve chamber down passage 116 Drain bypass passage 117 Connecting Road 117S Plug 118 Valve chamber up-flow side connecting passage 119 Connecting passage 120 Manual shutoff valve 121 Manual shutoff valve handle 200 Solenoid valve 210 Valve chamber 220 Valve body 300 Strainer element assembly 310 Strainer 320 Strainer cap 321 Bolt head 322 Shank 323 Threaded portion 400 Control unit housing 510 Solenoid valve up roadside valve 511 Solenoid valve up roadside valve handle 520 Solenoid valve down roadside valve 521 Solenoid valve down roadside valve handle 600 Drain generating device 610 Drain delivery path 800 Control Unit 810 Bus 820 Solenoid valve interface 830 Input interface 840 Display Interface

Claims

1. A strainer chamber and a drain storage chamber; a drain inlet hole leading to the strainer chamber; a strainer-drain passage leading from the strainer chamber to the drain storage chamber; a drain discharge passage for discharging the drain stored in the drain storage chamber from the drain storage chamber; a final drain outlet hole for finally discharging the drain to the outside and a final outlet-side flow path communicating with the final drain outlet hole; an electromagnetic valve provided between the drain discharge passage and the final outlet side flow path, for controlling whether or not drain in the drain discharge passage is allowed to flow to the final drain outlet hole; a valve chamber ascending passage leading from the drain discharge passage to a valve chamber of the solenoid valve; a valve chamber downflow path that guides drain from the valve chamber of the solenoid valve to the final outlet-side flow path; a drain bypass path that branches off from the drain discharge path and leads the drain to the outside via the final outlet side flow path and the drain final outlet hole; Equipped with A drain trap characterized in that the strainer chamber, the drain storage chamber, the strainer-drain passage, the drain discharge passage, the drain final outlet hole, the final outlet side flow path, the valve chest upward passage, the valve chest downward passage, and the drain bypass passage are provided in a die-cast block made of metal or resin.

2. 2. The drain trap according to claim 1, wherein the drain storage chamber is formed by forming a bottomed cylindrical recess vertically downward from the upper surface of the die-cast block, and covering this upper surface with a lid.

3. 3. The drain trap according to claim 2, wherein the strainer chamber is connected to the cylindrical drain inlet hole formed vertically downward from the upper surface of the die-cast block, and the drain flows in through this drain inlet hole.

4. A drain trap characterized in that the strainer chamber and the drain storage chamber are formed vertically, while the strainer-drain passage, the drain discharge path, and the drain outlet-side flow path are formed horizontally.

5. 2. The drain trap according to claim 1, wherein the drain bypass passage is provided with a manual shutoff valve.

6. 2. The drain trap according to claim 1, wherein the solenoid valve is a normally open type.

7. 2. The drain trap according to claim 1, wherein a water level sensor is provided in the drain storage chamber, and the opening and closing of the solenoid valve is controlled in accordance with the output of the water level sensor.

8. 8. The drain trap according to claim 7, wherein the water level measurement sensor comprises an upper limit water level detection flow sensor and a lower limit water level detection flow sensor.

9. 2. The drain trap according to claim 1, wherein an upstream solenoid valve is provided upstream of the solenoid valve, and a downstream solenoid valve is provided downstream of the solenoid valve.

10. a drain bypass passage on the solenoid valve side of the connecting point between the drain discharge passage and the drain bypass passage; an upstream side valve of the solenoid valve provided upstream of the solenoid valve; a downstream solenoid valve provided downstream of the front solenoid valve; 10. The drain trap of claim 9, comprising:

11. a solenoid valve upstream side valve provided in the drain discharge passage up to the valve chest upstream path, the solenoid valve being closer to the solenoid valve than a connection point between the drain discharge passage and the drain bypass path; a solenoid valve downstream side valve provided in the final outlet side flow path between a connection point between the valve chest downstream path and the final outlet side flow path and a drain final outlet hole; The drain trap according to claim 1, further comprising:

12. A drain trap configured to send drain from a drain generating device connected to the drain inlet hole to the drain inlet hole, and configured to send an operation stop signal notifying the operation of the drain generating device to stop, a control unit that controls opening and closing of the solenoid valve; a signal receiving unit that receives an operation stop signal sent from the drain generating device; Equipped with 2. The drain trap according to claim 1, wherein the control unit controls the solenoid valve to stop opening and closing when an operation stop signal arrives at the signal receiving unit.

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