WO2016133013A1

WO2016133013A1 - Strainer

Info

Publication number: WO2016133013A1
Application number: PCT/JP2016/054093
Authority: WO
Inventors: 浅田哲夫
Original assignee: 株式会社テイエルブイ
Priority date: 2015-02-17
Filing date: 2016-02-12
Publication date: 2016-08-25
Also published as: JP6200620B2; JPWO2016133013A1

Abstract

Provided is a strainer configured so that the operation of removal of foreign matter on a filter member by a blow valve and a cleaning member can be easily performed. A strainer 30 is provided with: a casing 31 having formed therein a flow passage for drainage; a screen 36 (filter member) provided in the flow passage in the casing 31 and capturing foreign matter contained in the drainage; an electrically driven cleaning brush 41 (cleaning member) in contact with the foreign matter capturing surface of the screen 36 and removing foreign matter on the capturing surface; an electrically driven blow valve 39 which opens to cause the flow of the drainage to discharge the foreign matter captured by the screen 36 to the outside; and a control unit 45 for driving the cleaning brush 41 and the blow valve 39 when the temperature of the drainage at the inlet of the casing 31 is lower than a predetermined value.

Description

strainer

This application relates to a strainer provided with a cleaning member and a blow valve.

For example, as disclosed in Patent Document 1, a strainer that is provided in, for example, a steam system and removes foreign matters contained in a drain is known. The strainer includes a filter member (screen) provided in a flow path in the casing, and foreign matter contained in the drained drain is captured by the filter member. The strainer includes a blow valve (second valve member) that opens a blow passage that is a part of a flow path in the casing, and is captured by the filter member by opening the blow valve. Foreign matter is discharged to the outside by the flow of drain. Thereby, clogging of the filter member is suppressed.

Further, as this kind of strainer, a strainer provided with a filter member cleaning member is disclosed in Patent Document 2, for example. The strainer includes a cleaning member (cleaning member) in contact with the foreign matter capturing surface (attachment surface) of the filter member, and the foreign matter captured by the filter member is removed by the cleaning member by rotating the handle. Thereby, clogging of the filter member is suppressed.

JP 7-303807 A JP 2012-192317 A

As a strainer, both the above-described blow valve of Patent Document 1 and the cleaning member of Patent Document 2 are provided in order to further suppress clogging of the filter member, that is, to enhance the function of removing foreign substances trapped by the filter member. It is preferable. However, in this case, since the blow valve and the cleaning member are manually operated, the foreign substance removing operation (removing operation) becomes complicated.

The technology disclosed in the present application has been made in view of such circumstances, and an object thereof is to provide a strainer that can easily remove foreign matters from a filter member using a blow valve and a cleaning member.

In order to achieve the above object, the strainer of the present application drives the blow valve and the cleaning member based on the inflow temperature (inlet temperature) or the inflow pressure (inlet pressure) of the drain.

Specifically, the strainer of the present application includes a casing, a filter member, an electric cleaning member, an electric blow valve, and a control unit. The casing has a drain channel formed therein. The said filter member is provided in the flow path of the said casing, and captures the foreign material in drain. The electric cleaning member is in contact with the foreign matter capturing surface of the filter member and removes the foreign matter on the capturing surface. When the electric blow valve is opened, the foreign matter captured by the filter member is discharged to the outside by a drain flow. The control unit drives the cleaning member and the blow valve when the inflow temperature or the inflow pressure of the drain in the casing becomes less than a predetermined value.

As described above, according to the strainer of the present application, when the drain inflow temperature (or inflow pressure) falls below a predetermined value, the cleaning member and the blow valve are driven. Can be done. Therefore, the foreign matter removal operation of the filter member can be easily performed. Further, when the filter member is clogged with foreign matter, the drain does not easily pass through the filter member, and the drain stays on the upstream side of the filter member. As a result, new drain does not flow into the upstream side of the filter member, so that the temperature and pressure of the drain accumulated on the upstream side gradually decrease. From this, it is possible to grasp that the filter member is clogged with foreign matter when the inflow temperature or inflow pressure of the drain, that is, the temperature or pressure of the drain on the upstream side of the filter member is lowered to a predetermined value or less. Therefore, according to the strainer of this application, the foreign material removal operation of the filter member can be performed at an appropriate timing.

Drawing 1 is a sectional view showing the schematic structure of the strainer and drain trap concerning an embodiment. FIG. 2 is a flowchart illustrating a control operation of the control unit according to the embodiment. Drawing 3 is a sectional view showing the schematic structure of the strainer concerning the modification of an embodiment.

Hereinafter, embodiments of the present application will be described with reference to the drawings. Note that the following embodiments are essentially preferable examples, and are not intended to limit the scope of the technology disclosed in the present application, applications thereof, or uses thereof.

As shown in FIG. 1, the strainer 30 of the present embodiment is provided integrally with the steam trap 1 (drain trap) by bolting or the like. The steam trap 1 and the strainer 30 are provided in, for example, a steam system, and a high-temperature and high-pressure drain (condensate) generated by the condensation of the steam flows therethrough.

The steam trap 1 is provided with a casing 10 that is a sealed container, and the high-temperature and high-pressure drain that flows in is stored and automatically discharged. The casing 10 has a lid portion 12 fastened to a main body portion 11 with bolts, and a storage chamber 13 is formed inside. The main body 11 has a drain inflow passage 14 and a discharge passage 15. The inflow passage 14 communicates with the upper portion of the storage chamber 13. A valve seat 17 is provided in the lower part of the storage chamber 13. A discharge passage 18 communicating with the discharge passage 15 is formed in the valve seat 17. The inflow end of the discharge path 18 serves as a drain discharge port and forms a so-called orifice.

The storage chamber 13 is provided with a hollow spherical float 16 in a free state. The float 16 opens and closes the discharge path 18 by being separated from and seated on the end face of the valve seat 17 on the storage chamber 13 side. In the steam trap 1, the drain that flows into the storage chamber 13 from the inflow passage 14 is discharged to the discharge passage 15 through the discharge passage 18 of the valve seat 17.

The casing 10 is provided with a discharge mechanism 20. The discharge mechanism 20 is provided at the upper part of the storage chamber 13 and is a discharge mechanism for low-temperature fluid that discharges low-temperature air or low-temperature drain in the storage chamber 13 to the discharge / discharge passage 24. The discharge mechanism 20 includes a valve seat 21 and a temperature responsive member 23. A discharge port 22 communicating with the discharge passage 24 is formed in the valve seat 21, and the discharge port 22 is opened and closed by a temperature responsive member 23. The temperature responsive member 23 is a substantially disc-shaped sealed capsule, and a thin plate diaphragm and a thermal expansion / contraction liquid are accommodated therein, although not shown. The discharge passage 24 is formed in the lid portion 12 and is connected to the discharge passage 15. In the discharge mechanism 20, when the temperature in the storage chamber 13 becomes high, the temperature responsive member 23 expands and closes the discharge port 22. When the temperature in the storage chamber 13 decreases, the temperature responsive member 23 contracts to open the discharge port 22, and the drain and air in the storage chamber 13 are discharged from the discharge port 22 to the discharge passage 24.

The strainer 30 of this embodiment constitutes a so-called Y-type strainer, and includes a casing 31 through which high-temperature and high-pressure drain flows, a screen 36, a blow valve 39, and a cleaning mechanism 40.

In the casing 31, an inflow path 32, an outflow path 33, a blow path 34, and a connection path 35 are formed. The inflow path 32, the outflow path 33, and the like constitute a drain flow path. The inflow path 32 and the outflow path 33 are provided coaxially with each other. The blow passage 34 is provided so as to be inclined from the flow path axes of the inflow path 32 and the outflow path 33 and is connected to the inflow path 32. The connection path 35 connects (communicates) the blow passage 34 and the inflow passage 14 of the steam trap 1. The outflow passage 33 communicates with the discharge passage 15 of the steam trap 1.

The screen 36 is provided across the inflow path 32 and the blow path 34 in the casing 31. The screen 36 is formed in a cylindrical shape extending in the axial direction of the blow passage 34, and one end is open to the inflow passage 32. A screen holder 37 that holds the screen 36 is provided at the opening end of the blow passage 34. The screen 36 captures foreign matter contained in the drain that has flowed into the blow passage 34 from the inflow passage 32, and constitutes a filter member according to the claims of the present application.

A blow pipe 38 communicating with the blow passage 34 is connected to the screen holder 37, and a blow valve 39 is provided on the blow pipe 38. The blow valve 39 is an electric on-off valve, and is constituted by, for example, an electromagnetic valve. When the blow valve 39 is opened, the foreign matter captured by the screen 36 is discharged to the outside by a drain flow.

The cleaning mechanism 40 removes foreign matter captured by the screen 36. The cleaning mechanism 40 includes a cleaning brush 41 and a motor 43. The cleaning brush 41 is provided inside the screen 36 and is in contact with the inner peripheral surface of the screen 36, that is, the foreign matter capturing surface (attachment surface) of the screen 36. The cleaning brush 41 is formed in a cylindrical shape whose length is shorter than that of the screen 36 (for example, half the length of the screen 36 or less). The motor 43 is provided outside the casing 31 and is connected to the cleaning brush 41 via the drive shaft 42. In the cleaning mechanism 40, the cleaning brush 41 reciprocates in the axial direction of the screen 36 by the motor 43, and the foreign matter on the screen 36 is removed by the reciprocating movement of the cleaning brush 41. That is, the cleaning brush 41 constitutes an electric cleaning member that comes into contact with the foreign matter capturing surface of the screen 36 and removes the foreign matter on the capturing surface.

In the strainer 30 configured as described above, high-temperature and high-pressure drain flows into the screen 36 from the inflow path 32, passes through the screen 36, and flows from the connection path 35 to the inflow path 14 of the steam trap 1. On the other hand, in the strainer 30, the drain from the discharge passage 15 of the steam trap 1 flows out through the outflow path 33. When the drain passes through the screen 36, foreign matter contained in the drain is captured by the screen 36. When the cleaning mechanism 40 is stopped, the cleaning brush 41 is located at the end of the screen 36 on the screen holder 37 side (the state shown in FIG. 1), and is directed from the inside of the screen 36 toward the connection path 35. The drain flow is not obstructed by the cleaning brush 41.

The strainer 30 of this embodiment includes a control unit 45 and a temperature sensor 46. The temperature sensor 46 is provided in the casing 31 and detects the temperature of the drain in the inflow path 32 (hereinafter referred to as inlet temperature). The controller 45 is configured to drive the blow valve 39 and the cleaning mechanism 40 (cleaning brush 41) when the inlet temperature is input from the temperature sensor 46 and the input inlet temperature becomes less than a predetermined value. That is, the control unit 45 drives the blow valve 39 and the cleaning brush 41 when the inflow temperature of the drain in the casing 31 becomes less than a predetermined value.

Specifically, the control unit 45 performs a control operation according to the flowchart shown in FIG. First, the controller 45 determines whether or not the inlet temperature of the temperature sensor 46 is lower than a predetermined value (step ST1), and if it is lower than the predetermined value, the process proceeds to step ST2. Moreover, the control part 45 will wait as it is, when inlet temperature is more than predetermined value. In step ST2, the cleaning mechanism 40 (cleaning brush 41) is driven by the control unit 45. Then, the cleaning brush 41 reciprocates in the axial direction of the screen 36 by the motor 43. Thereby, the foreign matter captured by the screen 36 is removed by the cleaning brush 41. Subsequently, the blow valve 39 is driven by the control unit 45 (step ST3). Then, the blow valve 39 is opened, and the foreign matter removed by the cleaning brush 41 and the foreign matter still captured (attached) to the screen 36 are discharged from the blow pipe 38 to the outside by the drain flow. In this way, the foreign matter captured by the screen 36 is removed and discharged.

As described above, according to the strainer 30 of the above embodiment, the blow valve 39 and the cleaning mechanism 40 (cleaning brush 41) are driven when the drain inlet temperature is lower than a predetermined value. The removal operation can be performed automatically. Accordingly, the foreign matter removing operation on the screen 36 can be easily performed.

Further, when the screen 36 is clogged with foreign matter, it becomes difficult for the drain to pass through the screen 36, and the drain stays on the upstream side of the screen 36, that is, inside the inflow path 32 and the screen 36. Then, since new drain does not flow into the inflow path 32, the temperature (inlet temperature) of the drain accumulated in the inflow path 32 and the like gradually decreases. From this, it is possible to grasp that the screen 36 is clogged with foreign matter when the drain inlet temperature is lowered below a predetermined value. Therefore, according to the strainer 30 of the said embodiment, the blow valve 39 and the cleaning mechanism 40 (cleaning brush 41) can be driven with the appropriate timing which needs the removal of a foreign material.

In the strainer 30 of the above embodiment, the blow valve 39 is driven after the cleaning mechanism 40 (cleaning brush 41) is driven. For this reason, first, the foreign matter captured by the screen 36 is removed by the cleaning brush 41, and then the removed foreign matter can be discharged to the outside by the flow of the drain. Therefore, the foreign matter captured by the screen 36 can be easily discharged as compared with the case where the foreign matter captured (attached) on the screen 36 is discharged by the drain flow. Thereby, the discharge | emission efficiency of a foreign material can be improved.

(Modification of the embodiment)
In this modification, as shown in FIG. 3, the structure of the cleaning mechanism 40 is changed in the strainer 30 of the above embodiment. Specifically, in the cleaning mechanism 40 of the present modification, the cleaning brush 41 is formed to have substantially the same length as the screen 36. In the cleaning mechanism 40, the cleaning brush 41 is configured to rotate around the axis of the screen 36 by the motor 43. That is, the cleaning brush 41 rotates while contacting the inner peripheral surface of the screen 36. By the rotation operation of the cleaning brush 41, the foreign matter captured by the screen 36 is removed. Although not shown, the cleaning brush 41 is in partial contact with the circumferential direction of the screen 36, and the drain flow from the inside of the screen 36 toward the connection path 35 is not hindered by the cleaning brush 41. Other configurations, operations, and effects are the same as those in the above embodiment.

In addition, you may make it comprise the said embodiment and its modification as follows.

For example, the control unit 45 drives the blow valve 39 and the cleaning mechanism 40 (cleaning brush 41) when the drain pressure (inlet pressure) in the inflow passage 32, that is, the drain inflow pressure in the casing 31, becomes less than a predetermined value. You may make it do. In that case, a pressure sensor that detects the pressure (inlet pressure) of the drain in the inflow path 32 is provided in the casing 31, and the inlet pressure is input to the control unit 45 from the pressure sensor. When the screen 36 is clogged and drainage stays in the inflow passage 32 or the like, not only the temperature but also the pressure gradually decreases. Therefore, it can be grasped that the screen 36 is clogged with foreign matter when the drain inlet pressure is reduced below a predetermined value. Therefore, also in this case, the same operational effects as the above-described embodiment can be obtained.

In the above embodiment, the control unit 45 controls the driving time (operation time) of the cleaning mechanism 40 (cleaning brush 41) and the blow valve 39 according to the inlet temperature of the drain or the rate of change thereof. Good. For example, the controller 45 increases the drive time of the cleaning mechanism 40 (cleaning brush 41) and the blow valve 39 on the assumption that the degree of clogging of the screen 36 is higher as the inlet temperature is lower or the change rate at which the inlet temperature decreases is higher. Let By doing so, the driving time of the cleaning mechanism 40 and the like can be controlled according to the degree of clogging of the screen 36. Thereby, it is possible to prevent the cleaning mechanism 40 and the like from being driven more than necessary, so that energy saving can be achieved. Further, when the blow valve 39 is opened, some steam may be discharged to the outside (outside of the steam system) together with drainage and foreign matter. As described above, the blow valve 39 is not driven more than necessary. , Can suppress the discharge of steam. These points are the same even when the driving time of the cleaning mechanism 40 or the like is controlled in accordance with the drain inlet pressure or the rate of change thereof instead of the drain inlet temperature.

In the above embodiment, the controller 45 may drive only the cleaning mechanism 40 (cleaning brush 41) without driving the blow valve 39 depending on the inlet temperature of the drain or the rate of change thereof. For example, when the inlet temperature is not so low or the rate of change at which the inlet temperature decreases is small, the control unit 45 drives only the cleaning mechanism 40 assuming that the degree of clogging of the screen 36 is not so high. Also by this, it is possible to prevent the blow valve 39 from being driven more than necessary, so that energy saving and steam discharge can be suppressed. This is the same even when only the cleaning mechanism 40 is driven by the drain inlet pressure or its rate of change instead of the drain inlet temperature.

Moreover, the cleaning mechanism 40 of the above embodiment may be reciprocated while rotating the cleaning brush 41.

Moreover, in the said embodiment and its modification, although the strainer 30 provided integrally with the steam trap 1 was demonstrated, the technique disclosed by this application is the same also about the strainer provided independently, for example in the upstream of a steam trap. Can be applied. That is, the technique disclosed in the present application can also be applied to a strainer in which drain flows in the order of the inflow path, the blow path (screen), and the outflow path without passing through the steam trap on the way.

The technology disclosed in the present application is useful for a strainer provided with a blow valve and a cleaning member for removing and discharging foreign matter captured by a screen.

30 Strainer 31 Casing 32 Inflow path (flow path)
33 Outflow channel
34 Blow passage (flow path)
35 Connection (flow path)
36 Screen (filter member)
39 Blow valve 41 Cleaning brush (cleaning member)
45 Control unit

Claims

A casing having a drain channel formed therein;
A filter member that is provided in the flow path of the casing and captures foreign matter in the drain;
An electric cleaning member that contacts the foreign matter capturing surface of the filter member and removes the foreign matter on the capturing surface;
An electrically operated blow valve that discharges foreign matter captured by the filter member to the outside by a drain flow by opening the valve;
A strainer comprising: a control unit that drives the cleaning member and the blow valve when the inflow temperature or the inflow pressure of the drain in the casing becomes less than a predetermined value.
The strainer according to claim 1, wherein
When the inflow temperature or the inflow pressure is less than a predetermined value, the control unit drives the cleaning member and then drives the blow valve.