Search

EP-4556078-B1 - CLOSED-SPACE MONITORING DEVICE

EP4556078B1EP 4556078 B1EP4556078 B1EP 4556078B1EP-4556078-B1

Inventors

  • TAGA, TOSHIYUKI

Dates

Publication Date
20260513
Application Date
20230921

Claims (5)

  1. A closed-space monitoring device (1) comprising: a retaining portion (2) that is fixed to an outer surface of a tube wall forming a closed space and has a through hole (2a) communicating with an insertion hole (D2) formed on the tube wall; a body (3) fixed to the retaining portion; and a control unit (4) coupled to a rear end of the body, wherein the body includes a guide tube (5) that communicates with the insertion hole and is fixed in close contact with the through hole, a monitoring unit (7) that is slidable inside the guide tube along a longitudinal direction of the guide tube, and a heat shielding portion (6) that is connected to a front side of the monitoring unit and slides inside the guide tube together with the monitoring unit to seal an end of the guide tube, the control unit includes a drive unit (4b) that moves the monitoring unit and a processing circuit unit that controls the drive unit to acquire image data from the monitoring unit, and the processing circuit unit controls the drive unit to move the monitoring unit and the heat shielding portion from a first state in which the heat shielding portion seals the end of the guide tube to shield the monitoring unit from heat to a second state in which the monitoring unit advances from the guide tube toward the closed space.
  2. The closed-space monitoring device according to claim 1, wherein, in the first state, an end surface of the heat shielding portion is flush with an inner surface of the tube wall.
  3. The closed-space monitoring device according to claim 1 or 2, wherein the processing circuit unit transmits the image data to an external device (P).
  4. The closed-space monitoring device according to claim 1 or 2, wherein the retaining portion is provided with a secondary through hole different from the through hole, and the tube wall is provided with a secondary insertion hole (D3) different from the insertion hole, and a temperature measurement unit (9) that measures a temperature inside the closed space to transmit temperature data to the processing circuit unit is provided in the body with the temperature measurement unit inserted into the secondary through hole and the secondary insertion hole.
  5. The closed-space monitoring device according to claim 4, wherein, in a case where the temperature data by the temperature measurement unit in the first state shows an abnormal value, the processing circuit unit controls the drive unit to move the monitoring unit to the second state to acquire image data.

Description

Technical Field The present invention relates to a closed-space monitoring device for confirming the condition of a closed space such as a duct from a remote location using a video or the like. Background Art Patent Document 1 discloses a fire detection system in which a visible light camera is installed in a duct for emitting greasy fumes and the like generated in a kitchen and so on to monitor abnormalities inside the duct from outside via the visible light camera. In a monitoring system that enables monitoring inside such a duct using a visible light camera, an operator can confirm, through videos captured by the visible light camera, the state of greasy fumes flowing inside the duct, oil adhering to a wall surface of the duct, and oil adhering to a fire damper that is installed near the visible light camera and operable to close the flow path. In a case where an abnormal amount of greasy fumes accumulates, or where a large amount of oil adheres to the wall surface or the fire damper, inspection including cleaning is carried out, so that a fire can be prevented inside the duct. A further example of a prior art closed-spaced monitoring device in which a camera can be retratcted from the closed space and closed off by a valve is shown in JP2003 185357. Citation List Patent Literature Patent Document 1:JP 2020-521193 A Summary of Invention Technical Problem However, in a case where the visible light camera, serving as a monitoring unit, installed in the duct is used for a long period of time in smoke generated in a kitchen and so on, dirt such as oil adheres to a lens of the visible light camera, which makes it difficult to visualize the situation inside the duct. Further, if a fire breaks out inside the duct, the high-temperature state continues, which may cause damage to an IC chip, a circuit board, and the like of the monitoring unit due to heat. This makes it impossible to continue monitoring in some cases. Further, if a malfunction occurs in the IC chip, the circuit board, and the like of the monitoring unit and a fire breaks out in the monitoring unit, the fire may spread to flammable dirt near the monitoring unit, which causes a disaster. An object of the present invention is to provide a closed-space monitoring device that solves the problems described above, prevents dirt from adhering to a lens of a monitoring unit, prevents damage to the monitoring unit due to heating, and prevents a malfunction of the monitoring unit from causing a fire in a closed space. Advantageous Effects of Invention According to the closed-space monitoring device of the present invention, the monitoring unit that monitors the inside of the closed space is advanced into the closed space only when necessary, so that dirt such as oil can be prevented from adhering to the lens of the monitoring unit. Further, a heat shielding portion is provided in the monitoring unit. Thereby, damage to the monitoring unit due to heating is prevented, and even if a fire breaks out in the monitoring unit, dirt in the closed space does not catch fire and a fire does not break out inside the closed space. Brief Description of Drawings FIG. 1 is a diagram illustrating a configuration of a closed-space monitoring device for a duct according to a first example.FIG. 2 is a diagram illustrating a configuration with a monitoring unit advancing into a duct.FIG. 3 is a diagram illustrating a configuration of a closed-space monitoring device according to a second example.FIG. 4 is a diagram illustrating a configuration with a monitoring unit advancing into a duct. Description of Embodiments The present invention will be described in detail with reference to the illustrated examples. First Example FIG. 1 is a diagram illustrating a configuration of a closed-space monitoring device for a duct according to the first example. FIG. 2 is a diagram illustrating a configuration with a monitoring unit advancing into a duct. A duct D for which a closed-space monitoring device 1 is installed forms a closed space. The duct D is, for example, installed in a kitchen or the like, and is a flue-gas pipe for exhausting flue gas generated during cooking to the outside, and serves to exhaust high-temperature air that contains oil and the like to the outside. Alternatively, the duct D may be installed in a factory or the like, and may exhaust air containing powder dust and the like. It is noted that a fire damper (not illustrated) is disposed in each compartment within the duct D. In the event of a fire breaking out in the duct D, the heat from the fire melts a heat-sensitive melting member of the fire damper, which releases the biasing force to rotate a blade of the fire damper by 90 degrees to thereby close a flue gas flow path of the duct D. As described above, the flow path is closed by the fire damper, which prevents the spread of the fire downstream of the fire damper. In FIG. 1, the duct D has a circular cross sectional shape perpendicular to the smoke flow. However,