Passive intelligent water pipe anti-freezing sensor adapted to work safety

Abstract

A passive intelligent water pipe anti-freezing sensor adapted to safe production according to the present invention uses water as a sensing element and utilizes the volume expansion of water during freezing as a driving force to realize the sensing of whether the water in the water pipe freezes. The present invention avoids the common indirect sensing method of measuring freezing by temperature, directly senses whether the water freezes, has accurate measurement, and achieves the effect of energy conservation and emission reduction.

Description

Technical Field

[0001] The invention belongs to the technical field of water pipe anti-freezing testing in work safety, and particularly relates to a passive intelligent water pipe anti-freezing sensor suitable for work safety. Background Art

[0002] When the temperature is between 0°C and 4°C, due to the weakened force between water molecules, the molecular spacing is larger, and the volume will increase. In winter, the ductility of metal is also weak. When water freezes, its volume increases, and the water pipe will burst. The bursting of water pipes will cause property losses. Therefore, in production and life, people prevent the water in the water pipes from freezing in various ways to ensure that the water pipes will not be frozen and cracked. In order to achieve the anti-freezing goal, the electric heating tape for water pipe anti-freezing came into being. Usually, a temperature controller is installed simultaneously with the installed heating tape. It is a temperature control terminal for the electric heating tape. By obtaining the temperature of the electric heating tape through a temperature sensing probe, it can intelligently adjust the output power to achieve a constant temperature effect. However, the temperature control terminal usually measures the air temperature. When the air temperature reaches 0°C, due to the different specific heats and environments of the water and air in the water pipe, the water temperature is not necessarily 0°C. Moreover, even when the water temperature reaches 0°C, the water in the water pipe will not freeze immediately. At this time, turning on the electric heating tape will cause waste of energy. A sensor that can accurately measure whether the water in the water pipe can freeze has become a key technology that affects whether the electric heating tape can meet the heating and anti-freezing requirements and save energy to the greatest extent. Summary of the Invention

[0003] The invention aims at the above-mentioned deficiencies of the prior art and provides a passive intelligent water pipe anti-freezing sensor suitable for work safety.

[0004] The passive intelligent water pipe anti-freezing sensor suitable for work safety is characterized in that: there is a piston (9) in a temperature sensing cylinder (18), and the piston (9) seals water in the temperature sensing cylinder (18); a fixed frame (1) is fixed on one side of the temperature sensing cylinder (18), a top spring (3) is installed at the top of the fixed frame (1), and a baffle (16) is installed in the middle of the fixed frame (1); a guide frame (12) is fixed on the side of the temperature sensing cylinder (18) opposite to the fixed frame (1), a guide sleeve (13) is fixed at the end of the guide frame (12), and a ratchet pawl (11) is installed on the upper surface of the guide frame (12); a movable frame (6) is inserted into the guide sleeve (13), there are ratchet teeth (10) at the lower end of the movable frame (6), and a limit nut (14) is installed at the bottom of the movable frame (6); the upper end of the movable frame (6) contacts with the top spring (3), a fixed column (2) is installed on the lower plane of the upper end of the movable frame (6), and a touch switch (4) adjacent to the fixed column (2); a guide ring (5) that slides freely is installed on the fixed column (2); a piston rod (17) is installed on the upper end surface of the piston (9), a return spring (8) is sleeved outside the piston rod (17), the piston rod (17) passes through a limit hole (19) on the baffle (16), a top rod stud (7) is installed at the upper end of the piston rod (17) through an internal threaded hole, a sensing spring (15) is sleeved outside the top rod stud (7), and the lower end of the sensing spring (15) is placed on the upper end surface of the piston rod (17). The diameter of the return spring (8) is larger than the diameter of the limit hole (19).

[0005] The beneficial effects of the present invention are as follows: A passive intelligent water pipe anti-freezing sensor adapted to safe production in the present invention uses water as a sensing element and utilizes the volume expansion of water during freezing as a driving force to realize the sensing of whether the water in the water pipe freezes. The present invention avoids the common indirect sensing method of measuring freezing by temperature, directly senses whether the water freezes, and has accurate measurement, achieving the effect of energy conservation and emission reduction. Brief Description of the Drawings

[0006] Figure 1 is the overall schematic diagram of the present invention;

[0007] Figure 2 is the top view schematic diagram of the baffle 16 of the present invention. Detailed Embodiment

[0008] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0009] As shown in the drawings, a passive intelligent water pipe anti-freezing sensor adapted to safe production is characterized in that there is a piston 9 in a temperature sensing cylinder 18, and the piston 9 seals water in the temperature sensing cylinder 18; a fixed frame 1 is fixed on one side of the temperature sensing cylinder 18, a top spring 3 is installed at the top of the fixed frame 1, and a baffle 16 is installed in the middle of the fixed frame 1; a guide frame 12 is fixed on the side of the temperature sensing cylinder 18 opposite to the fixed frame 1, a guide sleeve 13 is fixed at the end of the guide frame 12, and a pawl 11 is installed on the upper surface of the guide frame 12; a movable frame 6 is inserted into the guide sleeve 13, there are ratchet teeth 10 at the lower end of the movable frame 6, and a limit nut 14 is installed at the bottom of the movable frame 6; the upper end of the movable frame 6 contacts the top spring 3, a fixed column 2 is installed on the lower plane of the upper end of the movable frame 6, and a touch switch 4 adjacent to the fixed column 2; a guide ring 5 that slides freely is installed on the fixed column 2; a piston rod 17 is installed on the upper end surface of the piston 9, a return spring 8 is sleeved outside the piston rod 17, the piston rod 17 passes through a limit hole 19 on the baffle 16, a top rod stud 7 is installed at the upper end of the piston rod 17 through an internal thread hole, and a sensing spring 15 is sleeved outside the top rod stud 7. The diameter of the return spring 8 is larger than the diameter of the limit hole 19.

[0010] The temperature-sensing cylinder 18 is fixed beside the water pipe to be measured, so that the temperature-sensing cylinder 18 and the water pipe to be measured are in the same environment to achieve accurate measurement. In the initial state, the return spring 8 pushes the piston 9 downward, making the piston 9 in close contact with the water in the temperature-sensing cylinder 18. Under the action of gravity, the guide ring 5 is located at the bottom end of the fixed column 2 and does not contact the touch switch 4. The piston 9 seals the water in the temperature-sensing cylinder 18. When the temperature drops to 4 degrees, the water in the temperature-sensing cylinder 18 begins to expand, the piston 9 moves upward, and the piston rod 17 moves upward accordingly and passes through the limit hole 19 on the baffle 16. The piston 9 compresses the return spring 8, and the upper end face of the piston rod 17 pushes the sensing spring 15 to move upward together. When the upper end face of the sensing spring 15 touches the lower end face of the guide ring 5, the sensing spring 15 pushes the guide ring 5 to move upward along the fixed column 2. When the guide ring 5 touches the touch switch 4, the touch switch 4 is turned on to control the anti-freezing electric heating tape of the water pipe to be energized for heating. As the water in the temperature-sensing cylinder 18 continues to freeze and expand, the piston rod 17 drives the ejector rod stud 7 to continue to move upward. When the ejector rod stud 7 contacts the fixed column 2, the ejector rod stud 7 pushes the movable frame 6 to move upward along the lead screw sleeve 13, compressing the top spring 3. During this process, the guide ring 5 is always under the elastic force of the sensing spring 15, continuously pressing the touch switch 4 to keep the anti-freezing electric heating tape of the water pipe in the energized state. When the volume of the water in the temperature-sensing cylinder 18 expands to the maximum value, the movable frame 6 also reaches the highest point. At this time, the top spring 3 is always compressed. Among them, the highest point of the movement of the movable frame 6 is controlled by the length of the part of the ejector rod stud 7 extending out of the piston rod 17. By pre-rotating the ejector rod stud 7, the length of the part of the ejector rod stud 7 extending out of the piston rod 17 can be adjusted.

[0011] When the temperature rises, the ice in the temperature-sensing cylinder 18 melts and its volume shrinks. However, when ice melts, it cannot melt quickly and completely just because the temperature rises. It takes some time to completely melt, and the piston 9 returns to its original position. Therefore, there is a certain time delay between the piston returning to the initial position and the temperature rising. After the movable frame 6 reaches the highest point, when the ice melts, due to the interaction between the pawl 11 and the ratchet teeth 10, the movable frame 6 cannot move downward and remains at the highest point all the time. As the ice in the temperature-sensing cylinder 18 melts and its volume shrinks, under the action of the return spring 8, the piston 9 moves downward, and the piston rod 17, the ejector rod stud 7, and the sensing spring 15 also move downward together. When the sensing spring 15 disengages from the guide ring 5, the guide ring 5 begins to move downward and finally disengages from the touch switch 4, and the touch switch 4 is turned off to control the anti-freezing electric heating tape of the water pipe to be de-energized.

[0012] Since the change of air temperature has a long cycle, the shortest time is one day and night. If the air temperature rises during the day high enough to turn off the touch switch 4 and the anti-freezing electric heating tape of the water pipe is de-energized, the worker will restore the movable frame 6 to the initial position, wait for the next freezing cycle, and continue to sense.

Claims

1. A passive intelligent water pipe anti-freezing sensor adapted to work safety, characterized in that, There is a piston (9) inside the temperature-sensitive cylinder (18), and the piston (9) seals water inside the temperature-sensitive cylinder (18); a fixing frame (1) is fixed on one side of the temperature-sensitive cylinder (18), a top spring (3) is installed at the top of the fixing frame (1), and a baffle (16) is installed in the middle of the fixing frame (1); a lead screw frame (12) is fixed on the side of the temperature-sensitive cylinder (18) opposite to the fixing frame (1), a lead screw sleeve (13) is fixed at the end of the lead screw frame (12), and a ratchet (11) is installed on the upper surface of the lead screw frame (12); a movable frame (6) is inserted into the lead screw sleeve (13), there are ratchet teeth (10) at the lower end of the movable frame (6), and a limit nut (14) is installed at the bottom of the movable frame (6); the upper end of the movable frame (6) contacts the top spring (3), a fixing column (2) is installed on the lower plane of the upper end of the movable frame (6), and a touch switch (4) adjacent to the fixing column (2); a guide ring (5) that slides freely is installed on the fixing column (2); a piston rod (17) is installed on the upper end surface of the piston (9), a return spring (8) is sleeved outside the piston rod (17), the piston rod (17) passes through the limit hole (19) on the baffle (16), a top rod stud (7) is installed at the upper end of the piston rod (17) through an internal thread hole, a sensing spring (15) is sleeved outside the top rod stud (7), and the lower end of the sensing spring (15) is placed on the upper end surface of the piston rod (17).

2. The passive intelligent water pipe anti-freezing sensor adapted to work safety according to claim 1, wherein The diameter of the return spring (8) is larger than the diameter of the limit hole (19).

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