Freezing prevention device

Abstract

To provide a freezing prevention device for a water supply pipe, which can prevent high water bills without constantly draining water even when a low-temperature state continues.SOLUTION: A freezing prevention device 5 comprises a base part 10, a shaft part 20, a cylindrical part 30, a reciprocating movable body 40, a water discharge part 70, and a spring 80, etc, wherein the reciprocating movable body 40 is biased downward by the spring 80. A space S formed by a gap between the cylindrical part 30 and the shaft part 20 is filled with water, and a water supply pipe is connected to a water conduction hole 16 of the base part 10. Initially, a discharge hole 52 faces an inner peripheral surface of the water discharge part 70 to stop water discharge, but when the freezing prevention device 5 is cooled, water in the space S freezes and expands, causing the reciprocating movable body 40 to move upward and discharge water from a discharge hole 74. Subsequently, water from the water supply pipe is guided to a water conveyance hole 26, melting the ice in the space S and returning the reciprocating movable body to its original position to stop water discharge.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a device for preventing freezing of water pipes. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been an anti-freeze valve described in Patent Document 1 as a means for preventing freezing of water pipes.

[0003] The freeze prevention valve in Patent Document 1 has a water storage section, an armature section, and a valve body section. When the temperature is high enough not to cause freezing, the water in the water storage section does not freeze, so the valve body section and the armature section are urged upward by a spring, the valve body section is in the closed position, and water is not drained from the water pipe. On the other hand, when the temperature drops low enough to cause freezing, the water in the water storage section freezes, which increases the volume of the water. Then, the armature section and the valve body section are pushed downward against the elasticity of the spring, and the valve body section is displaced to the open position, which causes water to be drained from the water pipe. Then, when the temperature rises to a level at which freezing does not occur, the armature section and the valve body section rise, the valve body section is in the closed position, and water drainage stops. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-83065 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the freeze prevention valve described in Patent Document 1, when the temperature drops low enough to cause freezing, the valve body remains in the open position, causing water to continue to drain, resulting in high water bills.

[0006] To provide an antifreeze device that prevents freezing of water pipes and other water-carrying pipes, and that can prevent water bills from becoming high without constantly draining water, even when the temperature continues to drop. [Means for solving the problem]

[0007] The present invention has been made to solve the above problems, and firstly, there is provided an anti-freezing device for preventing freezing of a water pipe, the anti-freezing device having a base portion (10), an axial portion (20), a tubular portion (30), a reciprocating body (40), a cover ring (60), a water discharge portion (70), and a coil spring (80). The base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward the upper surface of the base portion. The tubular portion is cylindrical and provided on the upper surface of the base portion toward the upward direction, and the axial portion is axial. a second water guide hole (26) is provided in the shaft-shaped portion, penetrating from the upper end to the lower end of the shaft-shaped portion along the axis of the shaft-shaped portion on the upper surface of the base portion, the second water guide hole is connected to the first water guide hole, a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-shaped portion, the reciprocating body has a large diameter portion (42) and a small diameter portion (44) connected to the upper side of the large diameter portion and formed with an outer diameter smaller than that of the large diameter portion, an insertion hole (48) is provided in the large diameter portion into which the shaft-shaped portion is inserted, the outer peripheral surface of the shaft-shaped portion contacts the inner peripheral surface of the insertion hole, and the outer peripheral surface of the large diameter portion contacts the inner peripheral surface of the cylindrical portion The reciprocating body has a third water guide hole (49) having a smaller diameter than the insertion hole, which is connected to the insertion hole from the position of the wall portion (50) that is the upper end of the insertion hole toward the upper side, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, and a first discharge hole (52) that opens onto a side surface of the reciprocating body is provided from an upper position of the third water guide hole, the coil spring is provided along an outer circumferential surface of the small diameter portion between the lower end of the water discharge portion and the upper end of the large diameter portion, the cover ring is cylindrical and is provided facing upward while being connected to an upper end region of the outer circumferential surface of the cylindrical portion, and the water discharge portion is connected to the upper end region of the inner circumferential surface of the cover ring, the water discharge portion is provided with an insertion hole (72) through which the reciprocating body is inserted, and the water discharge portion is provided with a second discharge hole (74) formed from the inner circumferential surface of the insertion hole to the outer circumferential surface of the water discharge portion, and with the space (S) consisting of the gap between the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the shaft-shaped portion filled with water, water pipes are connected to the two openings of the water passage hole of the base portion, and in the initial state of the reciprocating body, the opening of the first discharge hole faces the inner circumferential surface of the insertion hole of the water discharge portion, so that discharge of water from the first discharge hole is stopped, and on the other hand, when the anti-freeze device is cooled,The water in the space freezes and expands, causing the reciprocating body to move upward against the biasing force of the coil spring, and when the first discharge hole reaches the position of the second discharge hole, water is discharged from the second discharge hole via the first discharge hole, and water at a temperature that melts the ice in the space is introduced from the water pipe to the second water introduction hole, causing the ice in the space to melt, and the reciprocating body to return to its initial position due to the biasing force of the coil spring.

[0008] According to the antifreeze device of the first configuration, even if the outside air temperature remains low, the water in the space freezes and melts repeatedly, causing the reciprocating body to repeatedly rise and fall, and water is discharged from the second discharge hole only when the reciprocating body rises. This means that even if the temperature remains low, water is not constantly discharged, and water bills can be prevented from becoming high.

[0009] In addition, as the water in the second and third water guide holes is discharged, the water in the second and third water guide holes moves, so the water in the second and third water guide holes does not freeze; and as the water in the second and third water guide holes is discharged, the water in the water pipe also moves, so the water in the water pipe does not freeze.

[0010] Furthermore, by providing a coil spring, the reciprocating body is urged by the force of the coil spring when the ice melts, so that the time from when the ice melts until the reciprocating body returns to its initial position can be shortened, and the time until the discharge of water stops can be shortened, thereby suppressing the discharge of excess water.

[0011] A second anti-freezing device prevents freezing of water pipes, which are pipes through which water passes, and has a base portion (10), an axial portion (20), a tubular portion (30), a reciprocating body (40), a cover ring (60), a water discharge portion (70), and an elastic member (80). The base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward the upper surface of the base portion. The tubular portion is tubular and is provided on the upper surface of the base portion facing upward. The axial portion is axial and is provided on the upper surface of the base portion facing the tubular portion. a first water guide hole (26) extending from the upper end to the lower end of the shaft-shaped portion along the axis of the shaft-shaped portion, the second water guide hole (26) communicating with the first water guide hole, a gap being formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-shaped portion, the reciprocating body has a large diameter portion (42) and a small diameter portion (44) connected to the upper side of the large diameter portion and having an outer diameter smaller than that of the large diameter portion, the large diameter portion is provided with an insertion hole (48) into which the shaft-shaped portion is inserted, the outer peripheral surface of the shaft-shaped portion contacts the inner peripheral surface of the insertion hole and the outer peripheral surface of the large diameter portion contacts the inner peripheral surface of the cylindrical portion, A third water guide hole (49) having a diameter smaller than that of the insertion hole is provided upward from the wall portion (50) which is the upper end, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, and a first discharge hole (52) which opens onto a side surface of the reciprocating body is provided from an upper position of the third water guide hole, the elastic member is provided between the water discharge portion and the large diameter portion and biases the large diameter portion downward, the cover ring is cylindrical and is provided facing upward, connected to an upper end region of the outer circumferential surface of the cylindrical portion, and the water discharge portion is connected to an upper end region of the inner circumferential surface of the cover ring. The water discharge section is provided with an insertion hole (72) through which the reciprocating body is inserted, and a second discharge hole (74) is formed in the water discharge section, extending from the inner peripheral surface of the insertion hole to the outer peripheral surface of the water discharge section. With the space (S) defined by the gap between the inner peripheral surface of the cylindrical section and the outer peripheral surface of the shaft-shaped section filled with water, water pipes are connected to the two openings of the water passage hole in the base section. In the initial state of the reciprocating body, the opening of the first discharge hole faces the inner peripheral surface of the insertion hole of the water discharge section, so that discharge of water from the first discharge hole is stopped. On the other hand, when the anti-freeze device is cooled, the water in the space freezes and expands, therebyThe reciprocating body moves upward against the biasing force of the elastic member, and the first discharge hole reaches the position of the second discharge hole, so that water is discharged from the second discharge hole via the first discharge hole, and water at a temperature that melts the ice in the space is introduced from the water pipe to the second water guide hole, so that the ice in the space melts, and the reciprocating body returns to its initial position due to the biasing force of the elastic member.

[0012] According to the antifreeze device of the second configuration, even if the outside air temperature remains low, the water in the space freezes and melts repeatedly, causing the reciprocating body to repeatedly rise and fall, and water is discharged from the second discharge hole only when the reciprocating body rises. This makes it possible to prevent water bills from becoming high without constantly draining water, even if the temperature remains low.

[0013] In addition, as the water in the second and third water guide holes is discharged, the water in the second and third water guide holes moves, so the water in the second and third water guide holes does not freeze; and as the water in the second and third water guide holes is discharged, the water in the water pipe also moves, so the water in the water pipe does not freeze either.

[0014] Furthermore, by providing an elastic member, the reciprocating body is biased by the biasing force of the elastic member when the ice melts, so that the time from when the ice melts until the reciprocating body returns to its initial position can be shortened, and the time until the discharge of water stops can be shortened, thereby suppressing the discharge of excess water.

[0015] Thirdly, in the above-mentioned first or second configuration, a first threaded portion (70a) is provided in a lower end region of the water discharge portion, and a second threaded portion (60b) is provided in an upper end region of the cover ring, the water discharge portion is connected to the cover ring by engaging the first threaded portion with the second threaded portion, and the vertical position of the water discharge portion relative to the cover ring can be adjusted by adjusting the engagement position of the first threaded portion relative to the second threaded portion.

[0016] Therefore, by adjusting the engagement position of the first threaded portion relative to the second threaded portion, when the water in the space freezes and expands, causing the reciprocating body to move against the spring force of the spring (elastic member), the positions of the first discharge hole and the second discharge hole of the reciprocating body after movement can be adjusted to coincide.

[0017] A fourth aspect is an anti-freezing device for preventing freezing of a water pipe, the anti-freezing device having a base portion (10), an axial portion (20), a cylindrical portion (30), a reciprocating body (40), a cover ring (60), and a water discharge portion (70), the base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward an upper surface of the base portion, the cylindrical portion is cylindrical and provided upward on the upper surface of the base portion, the axial portion is axial and provided upward on the inside of the cylindrical portion on the upper surface of the base portion, and the axial portion a second water guide hole (26) is provided inside the cylindrical portion and penetrates from the upper end to the lower end of the shaft-shaped portion along the axis of the shaft-shaped portion, the second water guide hole being connected to the first water guide hole, a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-shaped portion, the reciprocating body has a gap insertion portion (42-1) formed in a cylindrical shape, an insertion hole (48) into which the shaft-shaped portion is inserted is provided inside the gap insertion portion, the inner peripheral surface of the insertion hole is in contact with the outer peripheral surface of the shaft-shaped portion and the outer peripheral surface of the gap insertion portion is in contact with the inner peripheral surface of the cylindrical portion, and the reciprocating body has a wall portion (50) which is the upper end of the insertion hole and extends upward from the position of the wall portion (50) which is the upper end of the insertion hole. A third water guide hole (49) is connected to the insertion hole, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, and a first discharge hole (52) opening onto the side surface of the reciprocating body is provided from an upper position of the third water guide hole, the cover ring is cylindrical and connected to the upper end region of the outer circumferential surface of the cylindrical portion and provided facing upward, the water discharge portion is connected to the upper end region of the inner circumferential surface of the cover ring, and the water discharge portion is provided with an insertion hole (72) through which the reciprocating body is inserted, and the water discharge portion is formed from the inner circumferential surface of the insertion hole to the outer circumferential surface of the water discharge portion. A second drain hole (74) is provided, and when the space (S) defined by the gap between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-shaped portion is filled with water, a water pipe is connected to the two openings of the water passage hole of the base portion. In the initial state of the reciprocating body, the opening of the first drain hole faces the inner peripheral surface of the insertion hole of the water drain portion, so that the discharge of water from the first drain hole is stopped. On the other hand, when the anti-freeze device is cooled, the water in the space freezes and expands, causing the reciprocating body to move upward, and the first drain hole reaches the position of the second drain hole, so that water is discharged from the second drain hole via the first drain hole.The water in the space is melted by introducing water from the water pipe into the second water introduction hole at a temperature that melts the ice in the space, and the reciprocating body returns to its initial position.

[0018] According to the freeze prevention device of the fourth configuration, even if the outside air temperature remains low, the water in the space freezes and melts repeatedly, causing the reciprocating body to repeatedly rise and fall, and water is discharged from the second discharge hole only when the reciprocating body rises. This makes it possible to prevent water bills from becoming high without constantly draining water, even if the temperature remains low.

[0019] In addition, as the water in the second and third water guide holes is discharged, the water in the second and third water guide holes moves, so the water in the second and third water guide holes does not freeze; and as the water in the second and third water guide holes is discharged, the water in the water pipe also moves, so the water in the water pipe does not freeze.

[0020] A fifth antifreeze device prevents freezing of water pipes, which are pipes through which water passes, and has a base portion (10), an axial portion (20), a cylindrical portion (30), a reciprocating body (40), a cover ring (60), and a water discharge portion (70). The base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward the upper surface of the base portion. The cylindrical portion is cylindrical and is provided on the upper surface of the base portion facing upward. The axial portion is shaft-shaped and is provided on the upper surface of the base portion facing upward inside the cylindrical portion. a second water guide hole (26) penetrating from the upper end to the lower end of the shaft-shaped portion along the axis of the shaft-shaped portion is provided within the shaft-shaped portion, the second water guide hole being connected to the first water guide hole, a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-shaped portion, the reciprocating body has a gap insertion portion (42-1) formed in a cylindrical shape, an insertion hole (48) into which the shaft-shaped portion is inserted is provided inside the gap insertion portion, the inner peripheral surface of the insertion hole is in contact with the outer peripheral surface of the shaft-shaped portion and the outer peripheral surface of the gap insertion portion is in contact with the inner peripheral surface of the cylindrical portion, and the reciprocating body has an insertion hole (48) extending upward from the position of a wall portion (50) which is the upper end of the insertion hole A third water guide hole (49) having a smaller diameter than the insertion hole is connected to the insertion hole, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, and a first discharge hole (52) opening onto the side surface of the reciprocating body is provided from an upper position of the third water guide hole, the cover ring is cylindrical and connected to an upper end region of the outer circumferential surface of the cylindrical portion and provided facing upward, the water discharge portion is connected to an upper end region of the inner circumferential surface of the cover ring, and the water discharge portion is provided with an insertion hole (72) through which the reciprocating body is inserted, and the water discharge portion is shaped from the inner circumferential surface of the insertion hole to the outer circumferential surface of the water discharge portion. a second drain hole (74) formed in the base portion is provided, and when a space (S) defined by the gap between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft portion is filled with water, water pipes are connected to the two openings of the water passage hole of the base portion, and in the initial state of the reciprocating body, the opening of the first drain hole faces the inner peripheral surface of the insertion hole of the water drain portion, so that the discharge of water from the first drain hole is stopped; on the other hand, when the anti-freeze device is cooled, the water in the space freezes and expands, causing the reciprocating body to move upward, and the first drain hole reaches the position of the second drain hole, so that water is discharged from the second drain hole via the first drain hole;The water in the space is supplied from the water pipe to the second water guide hole at a temperature that melts the ice in the space, and the reciprocating body returns to its initial position.

[0021] According to the antifreeze device of the fifth configuration, even if the outside air temperature remains low, the water in the space freezes and melts repeatedly, causing the reciprocating body to repeatedly rise and fall, and water is discharged from the second discharge hole only when the reciprocating body rises. This makes it possible to prevent water bills from becoming high without constantly draining water, even if the temperature remains low.

[0022] In addition, as the water in the second and third water guide holes is discharged, the water in the second and third water guide holes moves, so the water in the second and third water guide holes does not freeze; and as the water in the second and third water guide holes is discharged, the water in the water pipe also moves, so the water in the water pipe does not freeze either.

[0023] In addition, as a sixth feature, in the first, second, fourth or fifth configuration, the base portion has a base portion main body (12) in which the water passage hole is provided, and a protrusion portion (14) provided on the upper surface of the base portion main body, a first water guide hole opens on the upper surface of the protrusion portion, the tubular portion is screwed onto the outer peripheral surface of the protrusion portion, and the axial portion is screwed onto the inner peripheral surface of the first water guide hole, a communication hole (14b) is provided in the protrusion portion between the outer peripheral surface of the protrusion portion and the upper surface of the protrusion portion, the communication hole communicates with the space between the tubular portion and the axial portion, and a plug portion (15) that closes the opening is removably provided on the opening of the communication hole on the outer peripheral surface side of the protrusion portion.

[0024] In the fourth configuration, the cylindrical portion may be provided with a hole or a notch through which a plug that closes the opening of the communication hole is inserted.

[0025] Seventhly, in the first, second, fourth or fifth configuration, the cylindrical portion is formed from a metal having a higher thermal conductivity than the shaft portion and the reciprocating body.

[0026] In addition, the eighth feature is that in the first, second, fourth or fifth configuration, the cylindrical portion is formed of copper, and the base portion, the axial portion, the reciprocating body, the covering and the water discharge portion are formed of a metal having a lower thermal conductivity than copper.

[0027] In addition, an O-ring (23a, 23b) may be provided in the upper end region of the outer peripheral surface of the shaft-shaped portion, an O-ring (43a, 43b) may be provided in the lower end region of the outer peripheral surface of the reciprocating body (which may also be the lower end region of the outer peripheral surface of the large diameter portion (gap insertion portion) of the reciprocating body), and O-rings (45a, 45b) may be provided above and below the first discharge hole on the outer peripheral surface of the reciprocating body.

[0028] A ninth aspect is a freezing prevention device for preventing freezing of water pipes, which are pipes through which water passes, and which has a base portion (110), an axis-shaped portion (120), a tubular portion (130), a reciprocating body (140), a water discharge portion (170), and an elastic member (180). The base portion has a water passage hole (116) between two openings provided on the side surface, and a first water guide hole (118) formed from the water passage hole toward the upper surface of the base portion. The tubular portion is tubular and is provided on the upper surface of the base portion facing upward. The axis-shaped portion is axial and extends from the upper surface of the base portion to the inside of the tubular portion. and the shaft-shaped portion is provided with a second water-conducting hole (126) penetrating from the upper end to the lower end of the shaft-shaped portion along the axis of the shaft-shaped portion, the second water-conducting hole being connected to the first water-conducting hole, and a gap being formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-shaped portion, the reciprocating body has a cylindrical body (142) formed in a cylindrical shape and an end constituent (144) provided at the upper end of the cylindrical body, and an insertion hole (145) into which the shaft-shaped portion is inserted is provided on the inside of the cylindrical body, the inner peripheral surface of the cylindrical body contacts the outer peripheral surface of the shaft-shaped portion and the outer peripheral surface of the cylindrical body contacts the inner peripheral surface of the cylindrical portion, and the end constituent The water discharge portion has a cylindrical water discharge portion main body (172) connected to an upper region of the outer circumferential surface of the cylindrical portion, and a wall member (174) provided on the opposite side of the water discharge portion main body from the base portion side and provided with a water discharge hole (174a) having a diameter smaller than the inner diameter of the water discharge portion main body, and the elastic member is provided between the wall member and the end structure, and when a space (S) formed by a gap between the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the shaft-shaped portion is filled with liquid, the elastic member is arranged to be in contact with the two openings of the water passage hole in the base portion. a water passage pipe is connected to the reciprocating body, and in the initial state of the reciprocating body, the sealing part blocks the upper end of the second water guide hole of the shaft-shaped part due to the biasing force of the elastic member, and discharge from the water discharge hole is stopped; on the other hand, when the anti-freeze device is cooled, the liquid in the space freezes and expands, causing the reciprocating body to be pushed by the frozen liquid and move upward against the biasing force of the elastic member, forming a gap between the sealing part and the upper end of the second water guide hole of the shaft-shaped part, and the water in the second water guide hole is discharged from the water discharge hole through the insertion hole of the end component part, and water at a temperature that melts the frozen liquid in the space is introduced from the water passage pipe into the second water guide hole,The frozen liquid in the space melts, and the reciprocating body returns to its initial position due to the biasing force of the elastic member.

[0029] According to the ninth antifreeze device, even if the outside temperature remains low, the water in the space freezes and melts repeatedly, causing the reciprocating body to rise and fall repeatedly, and water is discharged from the drain hole only when the reciprocating body rises. This means that even if the temperature remains low, water is not constantly drained, and water bills can be prevented from becoming high.

[0030] In addition, as the water in the second water guide hole is discharged, the water in the second water guide hole moves, so the water in the second water guide hole will not freeze, and furthermore, as the water in the water pipe moves as the water in the second water guide hole is discharged, the water in the water pipe will also not freeze.

[0031] Furthermore, by providing an elastic member, the reciprocating body is biased by the biasing force of the elastic member when the ice melts, so that the time from when the ice melts until the reciprocating body returns to its initial position can be shortened, and the time until the discharge of water stops can be shortened, thereby suppressing the discharge of excess water.

[0032] In addition, since the upper end of the second water guide hole is blocked by the sealing part and the water in the second water guide hole is discharged by raising the reciprocating body, a gap is created between the sealing part and the upper end of the shaft-shaped part with only a slight rise of the reciprocating body, allowing the water to be discharged. As a result, the water in the space only expands slightly, allowing the water in the second water guide hole to be discharged quickly before it freezes.

[0033] In addition, as a tenth feature, in the above-mentioned ninth configuration, the shaft-shaped portion has a small diameter portion (122-2) provided on the upper side of the shaft-shaped portion and a large diameter portion (122-1) connected downwardly from the small diameter portion, the outer diameter of the small diameter portion is formed smaller than the outer diameter of the large diameter portion, the outer peripheral surface of the large diameter portion contacts the inner peripheral surface of the cylindrical portion, and a space for putting liquid is formed in the gap between the outer peripheral surface of the small diameter portion and the inner peripheral surface of the cylindrical portion.

[0034] Therefore, the vertical length of the space for putting liquid can be shortened, and thereby the amount (volume) of liquid filled in the space can be reduced, so that the liquid in the space S can be quickly frozen and the reciprocating body can be raised to discharge the water from the discharge hole, and the water in the second water guide hole can be quickly discharged from the discharge hole before it freezes.

[0035] In an eleventh aspect, in the tenth configuration, the large diameter portion has a communication hole (122b) between its outer peripheral surface and its upper surface, the communication hole communicating with the space between the cylindrical portion and the small diameter portion, and a plug portion (125) for closing the opening of the communication hole on the outer peripheral surface side of the large diameter portion is removably provided.

[0036] In the eleventh configuration, the cylindrical portion may be provided with a hole or a notch through which a plug that closes the opening of the communication hole is inserted.

[0037] In addition, in a twelfth aspect, in the above-mentioned ninth, tenth or eleventh configuration, the elastic member is formed by a coil spring formed of a spiral filament member, and in a planar perspective view of the anti-freeze device, the insertion hole of the end structure is formed to the inside of the spiral filament member constituting the coil spring, so that the insertion hole communicates with the space inside the coil spring, and the space inside the coil spring communicates with a discharge hole provided in the wall member.

[0038] Therefore, even if the coil spring is compressed in the vertical direction and no gap is formed on the side of the coil spring, the water inside the second water guide hole can be discharged.

[0039] In addition, in the thirteenth, in the configuration of the ninth, tenth or eleventh, the base portion has a base portion main body (12) in which the water passage hole is provided, and a protrusion portion (14) provided on the upper surface of the base portion main body, a first water guide hole opens on the upper surface of the protrusion portion, the tubular portion is screwed onto the outer peripheral surface of the protrusion portion, and the axial portion is screwed onto the inner peripheral surface of the first water guide hole.

[0040] In addition, a fourteenth feature is that in the ninth, tenth or eleventh configuration, the cylindrical portion is formed from a metal having a higher thermal conductivity than the shaft portion and the end constituent body excluding the cylindrical body and the sealed portion in the reciprocating body.

[0041] In addition, a fifteenth feature is that in the ninth, tenth or eleventh configuration, the cylindrical portion is formed from copper, and the base portion, the shaft portion, the end structure excluding the cylindrical body and the sealed portion in the reciprocating body, and the water discharge portion are formed from a metal having a lower thermal conductivity than copper.

[0042] In addition, a sixteenth aspect is characterized in that in the ninth, tenth or eleventh configuration, the liquid is water.

[0043] In the above ninth to sixteenth configurations, an O-ring (123a) may be provided in the upper end region of the outer peripheral surface of the shaft-shaped portion, and an O-ring (140a) may be provided in the lower end region of the outer peripheral surface of the reciprocating body (which may be the lower end region of the outer peripheral surface of the cylindrical body of the reciprocating body). Effect of the Invention

[0044] According to the antifreeze device of the present invention, even if the outside air temperature remains low, the water in the space freezes and melts repeatedly, causing the reciprocating body to repeatedly rise and fall, and water is discharged from the second discharge hole only when the reciprocating body rises. This means that even if the temperature remains low, water is not constantly discharged, and water bills can be prevented from becoming high. [Brief description of the drawings]

[0045] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] 1A and 1B are diagrams showing a base part, in which (a) is a front view and (b) is a cross-sectional view taken along the line AA of (a). [Diagram 5] 1A and 1B are diagrams showing a shaft-shaped portion, in which (a) is a front view and (b) is a BB cross-sectional view of (a). [Figure 6] 1A and 1B are diagrams showing a cylindrical portion, in which (a) is a front view and (b) is a CC cross-sectional view of (a). [Figure 7] 1A is a front view of a reciprocating body, (b) is a DD cross-sectional view of (a), and (c) is an EE cross-sectional view of (a). [Figure 8] 1A and 1B are diagrams showing a cover ring, in which (a) is a front view and (b) is an FF cross-sectional view of (a). [Figure 9] 1A and 1B are diagrams showing a water discharge section, in which (a) is a front view, (b) is a cross-sectional view taken along line GG of (a), and (c) is a cross-sectional view taken along line HH of (a). [Figure 10] FIG. 2 is a cross-sectional view showing the anti-freezing device in use. [Figure 11] FIG. 2 is a cross-sectional view showing the anti-freezing device in use. [Figure 12] FIG. 11 is an exploded front view showing another example of the antifreeze device. [Figure 13] FIG. 11 is a cross-sectional view showing another example of the anti-freezing device. [Figure 14] 13A and 13B are diagrams showing a reciprocating movable body in another example of an anti-freezing device, in which (a) is a plan view, (b) is an AI-I cross-sectional view of (a), (c) is a JJ cross-sectional view of (a), (d) is a side view as viewed from the K arrow in (a), and (e) is a side view as viewed from the L arrow in (a). [Figure 15] FIG. 11 is a cross-sectional view showing another example of an anti-freezing device in use. [Figure 16] FIG. 11 is a cross-sectional view showing another example of an anti-freezing device in use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] The present invention provides an antifreeze device that prevents freezing of water pipes and other water-carrying pipes, and that can prevent water bills from becoming high without constantly draining water even when the temperature remains low. The object of the present invention is achieved as follows.

[0047] The antifreeze device 5 of this embodiment is configured as shown in Figures 1 to 9, and includes a base portion 10, an axial portion 20 attached to the base portion 10, a cylindrical portion 30 attached to the base portion 10, a reciprocating body 40 that reciprocates within the device, a cover ring 60 connected to the upper side of the cylindrical portion 30, a water discharge portion 70 connected to the upper side of the cover ring 60, and a spring 80 provided around the reciprocating body 40. The cylindrical portion 30 is made of copper, and each portion other than the cylindrical portion 30 (the base portion 10, the axial portion 20, the reciprocating body 40, the cover ring 60, the water discharge portion 70, and the spring 80) is made of stainless steel.

[0048] Here, the base portion 10 has a base portion main body 12 having an outer shape of a substantially square octagonal prism, and a substantially cylindrical protrusion portion 14 protruding from the upper surface of the base portion main body 12 .

[0049] The base body 12 has a pair of parallel side surfaces, a pair of parallel side surfaces that are perpendicular to the pair of side surfaces, and a chamfered corner of the adjacent side surface, and is provided with a water passage hole 16 that penetrates between the pair of side surfaces. The water passage hole 16 is provided with threaded portions 16a, 16b for screwing in a water pipe. In other words, the water pipe is connected to both sides of the water passage hole 16.

[0050] Furthermore, a water guide hole (first water guide hole) 18 is provided extending upward from the water passage hole 16, and this water guide hole 18 opens into the upper surface of the protrusion 14. This water guide hole 18 is provided with a threaded portion 18a for screwing into a connection portion 24 (described later) of the shaft-shaped portion 20. Since the water guide hole 18 is provided in the center, the protrusion 14 is generally cylindrical in shape as a whole.

[0051] The peripheral surface of the protruding portion 14 is provided with a threaded portion 14a for screwing with the cylindrical portion 30, and the protruding portion 14 is provided with an L-shaped hole (communicating hole) 14b between the peripheral surface and the upper surface of the protruding portion 14. The L-shaped hole 14b has a horizontal hole 14b-1 formed from the side surface of the protruding portion 14 and a vertical hole 14b-2 formed from the inner end of the horizontal hole 14b-1 to the upper surface of the protruding portion 14. The horizontal hole 14b-1 is provided with a threaded portion for screwing a screw (stopper portion) 15, and the screw 15 is screwed into the horizontal hole 14b-1. The L-shaped hole 14b is used when filling the space S with water, as described later. In other words, an L-shaped hole 14b is provided in the protrusion 14 between the outer peripheral surface of the protrusion 14 and the upper surface of the protrusion 14, and a screw 15 that closes the opening of the L-shaped hole 14b on the outer peripheral surface side of the protrusion 14 (i.e., the opening of the horizontal hole 14b-1) is removably provided.

[0052] As described above, the base portion 10 has the water passage hole 16 between the two openings provided on the side surface, and the water guide hole 18 is formed from the water passage hole 16 toward the upper surface of the base portion 10.

[0053] Next, the shaft-shaped portion 20 has a cylindrical peripheral surface, a shaft-shaped main body 22 that is generally shaft-shaped, and a connecting portion 24 that is connected to the lower end of the shaft-shaped main body 22. Grooves 22a and 22b for mounting O-rings 23a and 23b are formed circumferentially at intervals in the upper end region of the peripheral surface of the shaft-shaped main body 22. The O-ring 23a is mounted in the groove 22a, and the O-ring 23b is mounted in the groove 22b. That is, the O-rings 23a and 23b are provided in the upper end region of the outer peripheral surface of the shaft-shaped portion 20. These O-rings 23a and 23b prevent water in the space S from entering the gap between the inner peripheral surface of the large diameter portion 42 and the outer peripheral surface of the shaft-shaped main body 22, and prevent water from entering the gap between the outer peripheral surface of the shaft-shaped main body 22 and the inner peripheral surface of the large diameter portion 42 in the insertion hole 48 and reaching the space S when the water is discharged as shown in FIG.

[0054] The connecting portion 24 has a smaller diameter than the shaft-shaped main body 22, and is provided on its periphery with a threaded portion 24a for engaging with a threaded portion 18a provided in the water guide hole 18 of the base portion 10.

[0055] A water guide hole (second water guide hole) 26 is provided inside the shaft-shaped portion main body 22 and the connecting portion 24 along the axis (center line) J1 of the shaft-shaped portion main body 22 and the connecting portion 24, and the water guide hole 26 is formed in a straight line from the lower end of the connecting portion 24 to the upper end of the shaft-shaped portion main body 22, and the water guide hole 26 is formed penetrating from the upper end to the lower end of the shaft-shaped portion 20 along the axis J of the shaft-shaped portion 20. The cross section of this water guide hole 26 is circular.

[0056] The threaded portion 24a of the shaft-shaped portion 20 engages with the threaded portion 18a of the base portion 10, so that the shaft-shaped portion 20 is screwed onto the upper surface of the base portion 10 and faces upward. In other words, the shaft-shaped portion 20 is screwed onto the inner peripheral surface of the water-conducting portion 18, and the shaft-shaped portion 20 is provided on the upper surface of the base portion 10 facing upward.

[0057] Next, the tubular portion 30 is cylindrical and has a columnar outer circumferential surface, and the inner circumferential surface is a circumferential surface that conforms to the columnar outer circumferential surface.

[0058] A threaded portion 30a for engaging with the threaded portion 14a of the base portion 10 is provided in the lower end region of the inner peripheral surface, and a threaded portion 30b for engaging with the threaded portion 60a of the cover ring 60 is provided in the upper end region of the outer peripheral surface. The inner diameter 30L of the cylindrical portion 30 is formed larger than the outer diameter 20L of the shaft-shaped portion main body 22 (30L>20L), and the axis J1 of the shaft-shaped portion 20 and the axis J2 of the cylindrical portion 30 coincide with each other, so that a gap is formed between the inner peripheral surface of the cylindrical portion 30 and the outer peripheral surface of the shaft-shaped portion 20 (specifically, the shaft-shaped portion main body 22). Water is stored in the space S of this gap. In addition, a hole portion 32 for inserting a screw 15 is provided in the lower end region of the cylindrical portion 30.

[0059] The cylindrical portion 30 is made of copper because copper has a high thermal conductivity (403 (W / m·K) at 0° C.), and by configuring the inner circumferential surface of the cylindrical portion 30 to be in contact with the space S, the water in the space S can be easily frozen. In other words, when the anti-freezing device 5 is in a low-temperature environment, the water in the space S can be frozen faster than the water in the water guide holes 26, 49 freezes, and the reciprocating body 40 can be moved upward to discharge the water from the discharge holes 52, 74. In other words, if the water in the water guide holes 26, 49 freezes at the same time as the water in the space S freezes, the water in the water guide holes 26, 49 cannot be discharged, so the cylindrical portion 30 is made of copper to make it easier to freeze the water in the space S.

[0060] The threaded portion 30a of the cylindrical portion 30 engages with the threaded portion 14a of the base portion 10, so that the cylindrical portion 30 is screwed onto the upper surface of the base portion 10 and faces upward. In other words, the cylindrical portion 30 is screwed onto the outer peripheral surface of the protruding portion 14, and the cylindrical portion 30 is provided on the upper surface of the base portion 10 facing upward.

[0061] Next, the reciprocating body 40 has a large diameter portion 42, a small diameter portion 44 connected upward from the upper end of the large diameter portion 42, and a tip portion 46 formed upward from the upper end of the small diameter portion 44.

[0062] Here, the large diameter portion 42 has a cylindrical outer peripheral surface, and the diameter of the outer peripheral surface, i.e., the outer diameter 42L of the large diameter portion 42, is approximately the same as the diameter 30L of the inner peripheral surface of the cylindrical portion 30, and the outer peripheral surface of the large diameter portion 42 is in a state of being in contact with the inner peripheral surface of the cylindrical portion 30 so as to be slidable. In the lower end region of the outer peripheral surface of the large diameter portion 42, grooves 42a and 42b for mounting O-rings 43a and 43b are formed circumferentially at intervals, and the O-ring 43a is mounted in the groove 42a, and the O-ring 43b is mounted in the groove 42b. In other words, the O-rings 43a and 43b are provided in the lower end region of the outer peripheral surface of the reciprocating body 40 (specifically, the lower end region of the outer peripheral surface of the large diameter portion 42 of the reciprocating body 40). These O-rings 43a and 43b prevent water in the space S from entering the gap between the outer peripheral surface of the large diameter portion 42 and the inner peripheral surface of the cylindrical portion 30.

[0063] Furthermore, the small diameter portion 44 has a cylindrical outer circumferential surface, and the diameter of the outer circumferential surface, i.e., the outer diameter 44L of the small diameter portion 44, is formed smaller than the outer diameter 42L of the large diameter portion 42. Since the outer diameter 44L of the small diameter portion 44 is formed smaller than the outer diameter 42L of the large diameter portion 42, a spring 80 can be provided around the outer circumferential surface of the small diameter portion 44.

[0064] The large diameter portion 42, the small diameter portion 44, and the tip portion 46 share a common axis (center line) which is the axis J3, and when viewed in a plan view (from above), the outer circumferential surface of the large diameter portion 42, the outer circumferential surface of the small diameter portion 44, and the outer circumferential surface of the tip portion 46 are concentric.

[0065] The reciprocating body 40 is provided with an insertion hole 48 formed from the lower end of the large diameter portion 42, and a water guide hole (third water guide hole) 49 connected upward from the inner end of the insertion hole 48. Both the insertion hole 48 and the water guide hole 49 have a peripheral surface along the outer periphery of a cylinder (i.e., the cross section is circular), and the diameter of the insertion hole 48 is formed larger than the diameter of the water guide hole 49. The upper end of the insertion hole 48 is lower than the upper end of the large diameter portion 42, so that the inner diameter of the large diameter portion 42 becomes smaller halfway as it moves from the lower end to the upper end of the large diameter portion 42, forming a stepped shape, and the large diameter portion 42 has a wall portion 50 at the upper end position of the insertion hole 48. In other words, the water guide hole 49 is formed upward from the position of the wall portion 50, which is the upper end of the insertion hole 48.

[0066] The shaft-shaped portion 20 is inserted into the insertion hole 48. The inner peripheral surface of the insertion hole 48 contacts (or may be "closely attached") the outer peripheral surface of the shaft-shaped portion 20 so that the reciprocating body 40 can slide relative to the shaft-shaped portion 20, and the outer peripheral surface of the large diameter portion 42 contacts (or may be "closely attached") the inner peripheral surface of the cylindrical portion 30 so that the reciprocating body 40 can slide relative to the cylindrical portion 30. Furthermore, since O-rings 23a, 23b, 43a, and 43b are provided and a screw 15 is provided, it can be said that the space S is sealed. The gap insertion portion 42-1, which is a portion of the large diameter portion 42 below the position of the wall portion 50, has a cylindrical shape and is a portion that is inserted into the gap between the shaft-shaped portion 20 and the cylindrical portion 30. When the upper end of the shaft-shaped portion 20 contacts the wall portion 50, the water guide hole 49 communicates with the water guide hole 26.

[0067] The small diameter portion 44 has a discharge hole (first discharge hole) 52 connected to the upper end of the water guide hole 49. The discharge hole 52 is formed radially and has a hole portion 52a having an opening on the front side, a hole portion 52b having an opening on the rear side, a hole portion 52c having an opening on the right side, and a hole portion 52d having an opening on the left side, and each hole portion has a peripheral surface along the outer periphery of a cylinder (i.e., the vertical cross section is circular). In other words, from the upper position of the water guide hole 49, the discharge hole 52 is provided which opens on the side surface of the reciprocating body 40. The insertion hole 48 and the water guide hole 49 form an insertion hole 47 which passes between the lower end of the reciprocating body 40 and the discharge hole 52.

[0068] The length of the water guide hole 49 is formed so that when the water in the space S freezes and expands, pushing the reciprocating body 40 upward against the biasing force of the spring 80 (i.e., against the biasing force), the height position of the discharge hole 52 coincides with the height position of the discharge hole 74.

[0069] As described above, the reciprocating body 40 is provided with the insertion hole 48, the water guide hole 49, and the discharge hole 52, so that water guided to the insertion hole 48 passes through the water guide hole 49 and is discharged from the discharge hole 52.

[0070] A groove 44a for mounting an O-ring 45a is provided above the discharge hole 52 in the small diameter portion 44, and a groove 44b for mounting an O-ring 45b is provided below the discharge hole 52, with the O-ring 45a mounted in the groove 44a and the O-ring 45b mounted in the groove 44b. That is, the O-rings 45a and 45b are provided above and below the discharge hole 52 on the outer circumferential surface of the reciprocating body 40. These O-rings 45a and 45b allow the water discharged from the discharge hole 52 to be discharged to the outside from the discharge hole 74 without leaking from the gap between the small diameter portion 44 and the water discharge portion 70. The tip portion 46 is cylindrical.

[0071] The cover ring 60 is cylindrical and has a columnar outer circumferential surface, and the inner circumferential surface is a circumferential surface that conforms to the columnar outer circumferential surface. The cover ring 60 connects the tubular portion 30 and the water discharge portion 70.

[0072] A threaded portion 60a for engaging with the threaded portion 30b of the cylindrical portion 30 is provided in the lower end region of the inner peripheral surface of the cover ring 60, and the cover ring 60 is provided facing upward and connected by being screwed to the upper end region of the outer peripheral surface of the cylindrical portion 30. In addition, a threaded portion (second threaded portion) 60b for screwing to the water drain portion 70 is provided in the upper end region of the outer peripheral surface of the cover ring 60.

[0073] As shown in FIG. 3, a gap is formed between the inner peripheral surface of the cover ring 60 and the outer peripheral surface of the small diameter portion 44, and a spring 80 is provided in this gap.

[0074] The water discharge portion 70 has a cylindrical outer circumferential surface, and is provided with an insertion hole 72 in the vertical direction on the inside, as well as a discharge hole (second discharge hole) 74 connected to the insertion hole 72.

[0075] Here, a threaded portion (first threaded portion) 70a that engages with the threaded portion 60b of the cover ring 60 is provided in a lower region of the outer circumferential surface of the water drainage portion 70, and the water drainage portion 70 is screwed to the cover ring 60 by engaging the threaded portion 70a with the threaded portion 60b. In other words, the water drainage portion 70 is connected to an upper end region of the inner circumferential surface of the cover ring 60.

[0076] In addition, the insertion hole 72 has a circumferential surface that conforms to the cylindrical outer peripheral surface, the inner diameter of the insertion hole 72 is approximately the same as the outer diameter of the small diameter portion 44, and the outer peripheral surface of the small diameter portion 44 is in slidable contact with the inner peripheral surface of the insertion hole 72 (it may also be in a tightly attached state).

[0077] In addition, the discharge holes 74 are formed radially from the insertion hole 72, and the discharge holes 74 have a hole portion 74a having an opening on the front side, a hole portion 74b having an opening on the rear side, a hole portion 74c having an opening on the right side surface side, a hole portion 74d having an opening on the left side surface side, a hole portion 74e having an opening on the front right side, a hole portion 74f having an opening on the rear left side, a hole portion 74g having an opening on the front left side, and a hole portion 74h having an opening on the rear right side.

[0078] Adjacent holes among holes 74a to 72h are adjacent to each other at the end on the insertion hole 72 side with a small gap therebetween, and the gap is formed to be smaller than the diameter of each hole among holes 52a to 52d. Therefore, even if the reciprocating body 40 rotates around the axis, water discharged from each hole among holes 52a to 52d will be discharged from at least one of the holes among holes 74a to 72h.

[0079] The spring (elastic member) 80 is provided in the space between the small diameter portion 44 and the cover ring 60, and is formed of a coil spring. That is, the spring 80 is provided with the small diameter portion 44 inserted through the spring 80, and the upper end of the spring 80 contacts the lower end of the water discharge portion 70, and the lower end of the spring 80 contacts the upper end of the large diameter portion 42 (that is, the spring 80 contacts the downward surface of the water discharge portion 70 and the upward surface of the large diameter portion 42). That is, the spring 80 is provided along the outer circumferential surface of the small diameter portion 44 between the lower end of the water discharge portion 70 and the upper end of the large diameter portion 42, and the spring 80 biases the reciprocating body 40 downward.

[0080] To assemble the anti-freeze device 5, the shaft-shaped portion 20 is screwed onto the base portion 10, the cylindrical portion 30 is screwed onto the base portion 10, and the large diameter portion 42 is inserted into the cylindrical portion 30 so that the shaft-shaped portion main body 22 of the shaft-shaped portion 20 is positioned within the insertion hole 48. Thereafter, the cover ring 60 is screwed onto the cylindrical portion 30, and the spring 80 is placed in the gap between the small diameter portion 44 and the cover ring 60. Thereafter, the water discharge portion 70 is screwed onto the cover ring 60.

[0081] When screwing the water discharge part 70 to the covering ring 60, the vertical position of the water discharge part 70 is adjusted so that when the water in the space S freezes and expands, causing the reciprocating body 40 to move against the biasing force of the spring 80, the positions of the discharge hole 52 of the reciprocating body 40 after the movement and the discharge hole 74 of the water discharge part 70 coincide with each other. In other words, by adjusting the engagement position of the threaded portion 70a with the threaded portion 60b, the vertical position of the water discharge part 70 with respect to the covering ring 60 can be adjusted, and it can be said that the water discharge part 70 functions as an adjustment bolt that adjusts the engagement position of the threaded portion 70a of the water discharge part 70 with the threaded portion 60b of the covering ring 60.

[0082] To fill the space S with water, the shaft-shaped part 20 and the cylindrical part 30 are attached to the base part 10 (the shaft-shaped part 20 and the cylindrical part 30 attached to the base part 10 are considered to be in a semi-assembled state), and are submerged in water (for example, water in a container). At this time, the screw 15 is removed from the base part 10. Then, the gap between the cylindrical part 30 and the shaft-shaped part 20 is filled with water, and when the gap is filled with water, the semi-assembled part is pulled out of the water, and the reciprocating body 40 is inserted into the gap between the cylindrical part 30 and the shaft-shaped part 20. Then, the water is pushed by the end of the large diameter part 42 and discharged from the L-shaped hole 14b. By forming the diameter of the L-shaped hole 14b small, water is not discharged from the L-shaped hole 14b only when water is in the gap, but is discharged from the L-shaped hole 14b by pushing the water in with the large diameter part 42. Then, when the wall portion 50 of the large diameter portion 42 comes into contact with the tip of the shaft portion 20 and the reciprocating body 40 reaches the back, the screw 15 is screwed into the horizontal hole 14b-1 of the L-shaped hole 14b. In this way, the space S can be filled with water and sealed.

[0083] In addition, even if the diameter of L-shaped hole 14b is not sufficiently narrow and water leaks out from the gap when base portion 10 is turned downward, the semi-assembled product can be submerged in water, and with water entering the gap between tubular portion 30 and axial portion 20, reciprocating body 40 can be lightly inserted into the gap between tubular portion 30 and axial portion 20 (i.e., so that water will not leak out from the gap even if reciprocating body 40 is turned downward and pulled up), and then reciprocating body 40 can be pulled out of the water with the side of reciprocating body 40 facing downward, and the water can be drained from L-shaped hole 14b by pushing reciprocating body 40 in, and once reciprocating body 40 has reached the back, screw 15 can be screwed in.

[0084] 3, when the anti-freezing device 5 is assembled, the cylindrical portion 30 is disposed on the outside of the shaft-shaped portion 20, and a space S is provided between the shaft-shaped portion 20 (particularly the shaft-shaped portion main body 22) and the cylindrical portion 30. The reciprocating body 40 is biased downward by the spring 80, so that the upper end of the shaft-shaped portion 20 contacts a wall portion 50 within the large diameter portion 42 of the reciprocating body 40 (thereby, the reciprocating body 40 is at the lower end position of the moving range), and the water guide hole 26 and the water guide hole 49 are in communication (this is the initial state of the reciprocating body 40). In other words, in the initial position of the reciprocating body 40 in which the upper end of the shaft-shaped portion 20 contacts the wall portion 50, the water guide hole 49 is in communication with the water guide hole 26.

[0085] Furthermore, when the reciprocating body 40 is at the lower end position in its range of movement, the height position of the drain hole 52 is lower than the height position of the drain hole 74, the openings of each of the hole portions 52a-52d of the drain hole 52 are blocked by the inner circumferential surface 71 of the water drain portion 70, and the O-ring 45a is in contact with the inner circumferential surface of the water drain portion 70 at a position lower than the drain hole 74. In other words, when the reciprocating body 40 is at the lower end position, if the O-ring 45a is at the position of the drain hole 74, water that has reached the drain hole 52 will be discharged from the drain hole 74, so the O-ring 45a needs to be lower than the drain hole 74.

[0086] A description will now be given of the usage state of the anti-freezing device 5. Before using the anti-freezing device 5, the space S is filled with water as described above.

[0087] 10, water pipes 100 are connected to the water passage hole 16 of the base part 10 from both sides. That is, one water pipe 100 is screwed into the threaded part 16a, and the other water pipe 100 is screwed into the threaded part 16b. The water pipe 100 and the anti-freezing device 5 connected to the base part 10 are to be installed outdoors on the ground.

[0088] As shown in FIG. 10, the position of the reciprocating body 40 when it is at the lower end and the tip of the shaft-shaped portion 20 is in contact with the wall portion 50 is defined as the initial position, while the position of the reciprocating body 40 when it has risen, the discharge hole 52 is at the position of the discharge hole 74, and water is being discharged from the discharge hole 74 is defined as the water discharge position.

[0089] Here, when the outside air temperature is high, the water in the space S does not freeze, so the reciprocating body 40 is located in the initial position (the upper end of the shaft-shaped portion 20 is in contact with the wall portion 50), the openings of the holes 52a to 52d in the discharge hole 52 face and contact (or may be in close contact with) the inner surface of the water discharge portion 70, and the O-rings 45a, 45b of the reciprocating body 40 are located below the discharge hole 74 of the water discharge portion 70 and are in close contact with the inner surface of the water discharge portion 70, so that the water in the water guide holes 26, 49 is not discharged from the discharge hole 52.

[0090] On the other hand, when the outside air temperature drops, for example, from sunset to midnight, and the water in the space S freezes, the water (specifically, ice) in the space S expands, and the reciprocating body 40 is pushed by the frozen water and rises against the biasing force of the spring 80, and when the discharge hole 52 rises to the height position of the discharge hole 74 and reaches the water discharge position as shown in Fig. 11, the water in the water guide hole 26 and the insertion hole 47 (i.e., the insertion hole 48 and the water guide hole 49) is discharged from the discharge hole 74 via the discharge hole 52. As a result, the water in the water guide hole 26 and the insertion hole 47 moves as the water is discharged, so the water in the water guide hole 26 and the insertion hole 47 does not freeze, and further, the water in the water pipe 100 also moves as the water in the water guide hole 26 and the insertion hole 47 is discharged, so the water in the water pipe 100 does not freeze either.

[0091] In addition, since the water in the water guide hole 26 and the insertion hole 47 is farther from the outside air than the water in the space S, the water in the water guide hole 26 and the insertion hole 47 is not frozen at the time the water in the space S freezes. In particular, since the tubular part 30 is made of copper and has high thermal conductivity, the water in the space S that contacts the inner circumferential surface of the tubular part 30 freezes quickly and the water in the water guide hole 26 and the insertion hole 47 can be drained before it freezes. In other words, while the tubular portion 30 is made of copper, the base portion 10, the axial portion 20, the reciprocating body 40, the cover ring 60 and the water discharge portion 70 are made of stainless steel (with a thermal conductivity of approximately 17 (W / m·K)). In particular, the axial portion 20 and the reciprocating body 40, in which the water guide holes 26, 49 are provided, are made of stainless steel, and the tubular portion 30 is formed of a metal with a higher thermal conductivity than the axial portion 20 and the reciprocating body 40, so that the water in the space S freezes faster than the water in the water guide holes 26, 49.

[0092] In addition, when the water in the space S freezes, the water in the water guide hole 26 and the insertion hole 47 is also cooled, so the temperature of the water in the water guide hole 26 and the insertion hole 47 is lower than the temperature of the water in the water pipe 100. In other words, when the anti-freezing device 5 is placed on the ground, the temperature of the part of the water pipe 100 placed on the ground, including the part connected to the base 10, is low, but since water pipes are generally placed underground, it can be said that the temperature of at least the part of the water pipe placed underground is high. Note that the part of the water pipe placed on the ground up to the connection to the base 10 is exposed to the outside air, but by wrapping it with a heat insulating material, it is possible to prevent the water in the part placed on the ground from freezing even when the water in the space S freezes.

[0093] Then, as the water in the water guide hole 26 and the insertion hole 47 is discharged, the water in the water pipe 100 flows into the water guide hole 26 and the insertion hole 47, but since the temperature of the water in the water pipe 100, particularly the temperature of the water that was in the underground water pipe, is high (at least higher than the temperature of the water in the water guide hole 26 and the insertion hole 47 when the water in the space S freezes), the ice in the space S melts due to the heat from the water in the water guide hole 26. As a result, the volume of the water in the space S returns to its original value, and the reciprocating body 40 descends and returns to the initial position in Fig. 10, so that the discharge of water from the discharge hole 52 stops. In other words, even if the outside air temperature remains low, once the water in the space S melts, the discharge of water stops.

[0094] Thereafter, if the outside air temperature remains low, the water in space S will freeze again, and the water (specifically, ice) in space S will expand and rise up reciprocating body 40 to the water discharge position, where the water will be discharged from discharge hole 74. As a result, the water in water guide hole 26 and insertion hole 47 will move, so the water in water guide hole 26 and insertion hole 47 will not freeze, and further, the water in water pipe 100 will not freeze either. Thereafter, similarly, the ice in space S will melt due to the temperature of the water in the water pipe, and reciprocating body 40 will descend, stopping the discharge of water.

[0095] As described above, even if the outside air temperature remains low, the reciprocating body 40 will repeatedly rise and fall due to repeated freezing and melting of the water in the space S, and water will only be discharged from the discharge hole 74 when the reciprocating body 40 rises. This means that even if the temperature remains low, water is not constantly discharged, and water bills can be prevented from becoming high.

[0096] When the outside air temperature rises, such as when morning comes, the water in the space S naturally does not freeze, and so the water is not discharged from the discharge hole 74.

[0097] In the above explanation, the anti-freezing device 5 is connected to the water pipe 100 with the base part 10 on the bottom, but as described above, since water is discharged from the drain hole 74, there is a risk that the discharged water may splash onto the anti-freezing device 5. There is no particular problem if water splashes onto the anti-freezing device 5, but in order to prevent water from splashing onto it, it is possible to install the anti-freezing device 5 so that the base part 10 is on the top (i.e., the anti-freezing device 5 is hung from the water pipe 100) or to install the anti-freezing device 5 sideways (in which case the water pipe 100 is vertical).

[0098] In the above description, the spring 80 is provided, but the configuration of the spring 80 may be omitted. That is, since the space S is filled with water and sealed, when the water in the space S freezes and expands, it moves the reciprocating body 40 upward (toward the water discharge portion 70). However, when the ice in the space S melts thereafter, the volume of the space S shrinks as the ice melts, and the reciprocating body 40 is sucked in, so that the reciprocating body 40 moves downward even without the bias of the spring 80.

[0099] However, by providing the spring 80, the reciprocating body 40 is urged by the urging force of the spring 80 when the ice melts, so that the time from when the ice melts until the reciprocating body 40 returns to its initial position can be shortened, and the time until the discharge of water stops can be shortened, thereby suppressing the discharge of excess water.

[0100] In the above description, the spring 80 is provided between the water discharge portion 70 and the large diameter portion 42, but it may be an elastic member other than a spring (coil spring), and may be, for example, a member having elasticity (i.e., elasticity in the vertical direction (axial direction)) such as a cylindrical rubber material or a cylindrical synthetic resin material. In other words, it may be an elastic member provided between the water discharge portion 70 (specifically, the lower end (downward surface) of the water discharge portion 70) and the large diameter portion 42 (specifically, the upper end (upward surface) of the large diameter portion 42) in contact with the water discharge portion 70 and the large diameter portion 42, and biasing the large diameter portion 42 downward. In this case, it is preferable that the elastic member is provided along the outer periphery of the small diameter portion 44.

[0101] Also, although the cylindrical portion 30 is made of copper and each portion other than the cylindrical portion 30 is made of stainless steel, the material of the cylindrical portion 30 may be any material having a higher thermal conductivity than each portion other than the cylindrical portion 30, for example, silver (428 (W / m·K) at 0°C) or gold (319 (W / m·K) at 0°C). In other words, it is sufficient for the cylindrical portion 30 to be made of a metal having a higher thermal conductivity than the shaft portion 20, the reciprocating body 40, etc., but copper is preferable from the standpoint of cost.

[0102] In addition, even if the cylindrical portion 30 is not made of a material with high thermal conductivity such as copper, the space S is located inside the cylindrical portion 30 and is located closer to the external environment than the water guide holes 26, 49, so that the water in the space S freezes faster than the water in the water guide holes 26, 49, and the water in the space S freezes and expands due to the same action as described above, so that the water in the water guide holes 26, 49 can be discharged. That is, for example, the cylindrical portion 30 may be made of stainless steel like the other members. However, by making the cylindrical portion 30 from a material with high thermal conductivity such as copper and forming each part other than the cylindrical portion 30 from a metal with a lower thermal conductivity than copper, the water in the space S can be frozen early and reliably discharged before the water in the water guide holes 26, 49 starts to freeze.

[0103] In addition, in the above explanation, O-rings 23a, 23b are provided in the upper end region of the outer peripheral surface of the shaft-shaped portion 20, and O-rings 43a, 43b are provided in the lower end region of the outer peripheral surface of the reciprocating body 40, so that a pair of O-rings are provided, but the number of O-rings may be one.

[0104] In addition, although the hole 32 through which the screw 15 is inserted is provided in the lower end region of the cylindrical portion 30, it may be a notch formed from the lower end of the cylindrical portion 30. Note that, in the case where the length of the protruding portion 14 in the vertical direction is increased so that the lower end position of the cylindrical portion 30 is located above the hole 14b-1 of the L-shaped hole 14b when the cylindrical portion 30 is attached to the protruding portion 14, the hole 32 (or the notch) provided in the lower end region of the cylindrical portion 30 may be omitted.

[0105] In addition, in the above explanation, it is described that a water pipe 100 is connected to the base portion 10 of the anti-freeze device 5, but it may also be a pipe that carries water other than a water pipe, and as a result, the anti-freeze device 5 may be configured to prevent freezing of a water-carrying pipe, which is a water pipe or other water-carrying pipe, and by connecting the water-carrying pipe to the anti-freeze device 5, it is possible to prevent the water-carrying pipe from freezing.

[0106] Also, for example, a snow melting pipe buried in the ground, which is built up from underground and passes groundwater, can be connected to the anti-freezing device 5 so that the anti-freezing device 5 protrudes upward from the ground surface, thereby preventing the snow melting pipe from freezing, and the water discharged from the water discharge part 70 can be made to flow onto the road surface to prevent the road surface from freezing. This prevents water from constantly flowing onto the road surface as in conventional snow melting pipes, thereby reducing the consumption of groundwater. Note that since the water in the space S is more likely to freeze when the anti-freezing device 5 is installed exposed from the ground surface, it is preferable to extend the length of the protruding part 14 of the base part 10 and expose the entire tubular part 30 (the entire length in the vertical direction) from the ground surface.

[0107] Another example of the antifreeze device will be described. The antifreeze device 105 is configured as shown in Figs. 12 to 14, and includes a base portion 110, an axis-shaped portion 120 attached to the base portion 110, a cylindrical portion 130 attached to the base portion 110, a reciprocating body 140 that reciprocates within the device, a water discharge portion 170 connected to the upper side of the cylindrical portion 130, and a spring 180 provided in the water discharge portion 170. The cylindrical portion 130 is made of copper, and each portion other than the cylindrical portion 130 (the base portion 110, the axis-shaped portion 120, the reciprocating body 140 (excluding the sealing portion 148), the water discharge portion 170, and the spring 180) is made of stainless steel. In other words, the cylindrical portion 130 is formed of a metal having a higher thermal conductivity than the axis-shaped portion 120, the end constituent body 144 of the reciprocating body 140 excluding the cylindrical body 142 and the sealing portion 148, and the water discharge portion 170.

[0108] Here, the base portion 110 has the same configuration as the base portion 10, and has a base portion main body 112 having an approximately square octagonal prism-like outer shape, and an approximately cylindrical protrusion portion 114 protruding from the upper surface of the base portion main body 112.

[0109] The base body 112 has a pair of parallel side surfaces, a pair of parallel side surfaces that are perpendicular to the pair of side surfaces, and a chamfered corner of the adjacent side surface, and is provided with a water passage hole 116 that penetrates between the pair of side surfaces. The water passage hole 116 is provided with threaded portions 116a, 116b for screwing in a water pipe. In other words, the water pipe is connected to both sides of the water passage hole 116.

[0110] Furthermore, a water guide hole (first water guide hole) 118 is provided extending upward from the water passage hole 116, and this water guide hole 118 opens into the upper surface of the protrusion 114. This water guide hole 118 is provided with a threaded portion 118a for screwing into a connection portion 124 (described later) of the shaft-shaped portion 120. Since the water guide hole 118 is provided in the center, the protrusion 114 is generally cylindrical in shape as a whole.

[0111] Further, a threaded portion 114a for screwing with the cylindrical portion 130 is provided on the peripheral surface of the protruding portion 114.

[0112] As described above, the base portion 110 has the water passage hole 116 between the two openings provided on the side surface, and the water guide hole 118 is formed from the water passage hole 116 toward the upper surface of the base portion 110.

[0113] Next, the shaft-shaped portion 120 has a cylindrical circumferential surface, and includes a shaft-shaped main body 122 that is shaft-shaped overall, and a connection portion 124 that is connected to the lower end of the shaft-shaped main body 122.

[0114] Here, the outer diameter of the lower region of the shaft-shaped portion main body 122 is formed to be larger than the outer diameter of the upper region, and the shaft-shaped portion main body 122 has a small diameter portion 122-2 provided on the upper side of the shaft-shaped portion 120, and a large diameter portion 122-1 connected downward from the small diameter portion 122-2.

[0115] The outer peripheral surface of large diameter portion 122-1 and the outer peripheral surface of small diameter portion 122-2 both form cylindrical surfaces, the outer peripheral surface of large diameter portion 122-1 is in contact with the inner peripheral surface of tubular portion 130, and the outer diameter of small diameter portion 122-2 is formed smaller than the outer diameter of large diameter portion 122-1, thereby providing a gap between the outer peripheral surface of small diameter portion 122-2 and the inner peripheral surface of tubular portion 130.

[0116] Further, a groove for mounting an O-ring 123a is formed circumferentially in an upper end region of the outer circumferential surface of the small diameter portion 122-2, and the O-ring 123a is mounted in the groove. That is, the O-ring 123a is provided in the upper end region of the outer circumferential surface of the shaft-shaped portion 120. The O-ring 123a prevents water in the space S from entering the insertion hole 146-3 (described later), and prevents water from entering the gap between the outer circumferential surface of the small diameter portion 122-2 and the inner circumferential surface of the cylindrical body 142 and reaching the space S when the water is discharged as shown in FIG.

[0117] The connecting portion 124 has a smaller diameter than the shaft-shaped main body 122 , and is provided with a threaded portion 124 a on its periphery for engaging with a threaded portion 118 a provided in the water guide hole 118 of the base portion 110 .

[0118] A water guide hole (second water guide hole) 126 is provided inside the shaft-shaped portion main body 122 and the connecting portion 124 along the axis (center line) J1 of the shaft-shaped portion main body 122 and the connecting portion 124, and the water guide hole 126 is formed in a straight line from the lower end of the connecting portion 124 to the upper end of the shaft-shaped portion main body 122, and the water guide hole 126 is formed penetrating from the upper end to the lower end of the shaft-shaped portion 120 along the axis J of the shaft-shaped portion 120. The cross section of this water guide hole 126 is circular. The water guide hole 126 communicates with the water guide hole 118.

[0119] The threaded portion 124a of the shaft-shaped portion 120 engages with the threaded portion 118a of the base portion 110, whereby the shaft-shaped portion 120 is screwed onto the upper surface of the base portion 110 and provided facing upward. In other words, the shaft-shaped portion 120 is screwed onto the inner peripheral surface of the water-guiding portion 118, and the shaft-shaped portion 120 is provided on the upper surface of the base portion 110 facing upward.

[0120] Next, the tubular portion 130 has the same configuration as the tubular portion 30, is cylindrical, has a columnar outer circumferential surface, and has an inner circumferential surface that conforms to the columnar outer circumferential surface.

[0121] A threaded portion 130a for engaging with the threaded portion 114a of the base portion 110 is provided in the lower end region of the inner peripheral surface, and a threaded portion 130b for engaging with the threaded portion 170a of the water discharge portion 170 is provided in the upper end region of the outer peripheral surface. The inner diameter of the cylindrical portion 130 is formed larger than the outer diameter of the small diameter portion 122-2 of the shaft-shaped portion main body 122, and the axis of the shaft-shaped portion 120 and the axis of the cylindrical portion 130 coincide with each other, so that a gap is formed between the inner peripheral surface of the cylindrical portion 130 and the outer peripheral surface of the small diameter portion 122-2. Water (liquid) is contained in the space S of this gap.

[0122] In addition, by providing an L-shaped hole (communicating hole) 122b having a configuration similar to L-shaped hole 14b between the upper end of large diameter portion 122-1 and the outer peripheral surface of large diameter portion 122-1, providing a hole portion in tubular portion 130 that communicates with the L-shaped hole, and providing a screw (plug portion) 125 (a screw having a configuration similar to screw 15) that can be attached and detached to the hole portion and the L-shaped hole, it can be used to fill space S with water.

[0123] The reason why the cylindrical portion 130 is made of copper is that, as in the case of the cylindrical portion 30, copper has a high thermal conductivity (403 (W / m·K) at 0° C.), and by configuring the inner circumferential surface of the cylindrical portion 130 to be in contact with the space S, the water in the space S can be easily frozen. That is, when the anti-freezing device 105 is in a low-temperature environment, the water in the space S can be frozen faster than the water in the water guide hole 126 freezes, and the reciprocating body 140 can be moved upward to discharge the water from the discharge holes 52, 74. That is, if the water in the water guide hole 126 freezes at the same time as the water in the space S freezes, the water in the water guide hole 126 cannot be discharged, so the cylindrical portion 130 is made of copper to make it easier to freeze the water in the space S.

[0124] The threaded portion 130a of the cylindrical portion 130 engages with the threaded portion 114a of the base portion 110, whereby the cylindrical portion 130 is screwed onto the upper surface of the base portion 110 and provided facing upward. In other words, the cylindrical portion 130 is screwed onto the outer peripheral surface of the protruding portion 114, and the cylindrical portion 130 is provided on the upper surface of the base portion 110 facing upward.

[0125] Next, the reciprocating body 140 has a cylindrical body (gap insertion portion) 142 provided in the gap between the small diameter portion 122-2 and the cylindrical portion 130, and an end forming body 144 provided at the upper end of the cylindrical body 142.

[0126] Here, the tubular body 142 has a cylindrical tube shape and is provided with an insertion hole 145 into which the small diameter portion 122-2 of the shaft-shaped portion 120 is inserted, and the inner surface of the tubular body 142 contacts the outer surface of the small diameter portion 122-2, and the outer surface of the tubular body 142 contacts the inner surface of the tubular portion 130.

[0127] A groove for mounting the O-ring 140a is formed circumferentially in the lower end region of the outer circumferential surface of the cylindrical body 142, and the O-ring 140a is mounted in the groove. That is, the O-ring 140a is provided in the lower end region of the outer circumferential surface of the cylindrical body 142. The O-ring 140a prevents water in the space S from entering the gap between the cylindrical body 142 and the cylindrical portion 130.

[0128] Further, the end constructing body 144 has a main body portion 146 connected to the cylindrical body 142, and a sealing portion 148 provided on the lower surface side of the main body portion.

[0129] The main body 146 has a substantially circular plate shape, and includes a main body component 146-2 having a recess 146-1 provided on the lower side thereof and a protrusion 146-3 protruding upward from the upper surface of the main body component 146-2, and an insertion hole 146-4 is provided in the main body 146, which communicates with the upper surface and the lower surface of the main body 146. The main body component 146-2 has a shape in which the recess 146-1 is provided on the lower side of the circular plate shape, and the insertion hole 146-4 is provided.

[0130] 14, the recess 146-1 has a planar ceiling surface 146-1a and a circumferential inner surface 146-1b, and the ceiling surface 146-1a and the inner surface 146-1b are not formed in the area where the insertion hole 146-3 is formed. A sealing portion 148 is provided in the recess 146-1.

[0131] 14, the protrusion 146-3 has a flat upper surface 146-3a and an outer peripheral surface connected to the upper surface 146-3a, and the outer peripheral surface has a substantially cylindrical shape, but the outer diameter of the portion where the insertion hole 146-4 is provided is smaller than the outer diameter of the portion where the insertion hole 146-4 is not provided. In other words, the outer peripheral surface of the protrusion 146-3 is provided with a large diameter outer peripheral surface 146-3b and a small diameter outer peripheral surface 146-3c alternately, and when the protrusion 146-3 is viewed from above, the small diameter outer peripheral surface 146-3c has a sector-shaped notch. This protrusion 146-3 has a cylindrical shape with multiple notches formed along its periphery.

[0132] The through holes 146-4 are fan-shaped in plan view, and a total of four through holes 146-4 are provided on the front side (side as viewed from arrow C), the back side, the right side side, and the left side side. The fan-shaped cutout portion of the protrusion 146-3 also constitutes a part of the through holes 146-4.

[0133] This insertion hole 146-4 is formed inside the inner position of the spring 180, and a gap P is formed between the inner position of the spring 180 and the inner position of the insertion hole 146-4. In other words, in a planar perspective view of the anti-freezing device 105, the insertion hole 146-4 is formed up to the inside of the spiral filament member that constitutes the spring 180, so that the insertion hole 146-4 communicates with the space inside the spring 180. As a result, water in the insertion hole 146-4 can pass through the gap of the gap L into the space inside the spring 180 and be discharged from the discharge hole 174a.

[0134] The sealing portion 148 has a circular plate shape and is formed with an outer diameter larger than the diameter of the water guide hole 126 so that it can close the upper end of the water guide hole 126 of the shaft-shaped portion 120. This sealing portion 148 is formed of an elastic material having flexibility and restorability, such as rubber, so as to make it easier to seal the water guide hole 126. The sealing portion 148 is attached to the main body portion 146 by a screw member (sealing portion attachment portion) 149. That is, an insertion hole for inserting a screw member is provided in the sealing portion 148, and the screw member 149 is screwed into the main body portion 146 from below with the sealing portion 148 inserted into the sealing portion.

[0135] As described above, the end constituent 144 has the insertion hole 146-3 for passing water upward from the water guide hole 126, and has a sealing portion 148 for closing the upper end of the water guide hole 126 of the shaft-shaped portion 120.

[0136] Next, water discharge portion 170 has a cylindrical outer circumferential surface, a hole formed from the lower surface side, and a discharge hole 174a for discharging water is provided on the upper surface, and water discharge portion 170 has a cylindrical water discharge portion main body 172 and a wall member 174 connected to the upper end of water discharge portion main body 172. Wall member 174 is provided on the side of water discharge portion main body 172 opposite to the base portion 110 side.

[0137] Here, the water discharge portion main body 172 has a large diameter hole 172-1 formed from the lower end of the water discharge portion main body 172 and a small diameter hole 172-2 connected to the upper side of the large diameter hole 172-1, both of which have cylindrical inner circumferential surfaces, and a threaded portion 170a for engaging with the threaded portion 130b of the cylindrical portion 130 is provided in the lower end region of the inner periphery of the large diameter hole 172-1. This large diameter hole 172-1 is a space for arranging the reciprocating body 140, and is particularly designed to accommodate the reciprocating body 140 even when the reciprocating body 140 is in a raised state.

[0138] Further, the small diameter hole 172-2 is formed to have approximately the same outer diameter as the spring 180, so that the spring 180 can be disposed within the small diameter hole 172-2. The axis of the large diameter hole 172-1 and the axis of the small diameter hole 172-2 are formed on the same axis line.

[0139] The wall member 174 is in the shape of a circular plate, and has a drain hole (water drain hole) 174a for draining water formed in the approximate center. The diameter of the drain hole 174a is smaller than the inner diameter of the small diameter hole 172-2 in order to accommodate the spring 180 in the small diameter hole 172-2 (that is, the drain hole 174a is formed to have a smaller diameter than the inner diameter of the water drain body 172). In a plan view perspective of the anti-freezing device 105, the drain hole 174a is formed inside the spiral filament member that constitutes the spring 180, and the space inside the spring 180 communicates with the drain hole 174a.

[0140] Moreover, the spring (elastic member) 180 is provided in the space inside the water discharge portion 170, and is formed of a coil spring. That is, the spring 180 is formed of a spiral filament member, and the upper end of the spring 180 contacts the lower surface of the wall member 174, and the lower end of the spring 180 contacts the upper surface of the end constituent 144 (the area other than the convex portion 146-2), and the spring 180 urges the end constituent 144 downward. That is, the spring 180 is provided between the wall member 174 and the end constituent 144.

[0141] To assemble the anti-freeze device 105, the shaft portion 120 is screwed onto the base portion 110, and the tubular portion 130 is screwed onto the base portion 110. Then, water is filled into the space S defined by the gap between the tubular portion 130 and the small diameter portion 122-2 of the shaft portion 120. Then, the tubular body 142 of the reciprocating portion 140 is inserted into the gap between the tubular portion 130 and the small diameter portion 122-2 of the shaft portion 120. Then, the spring 180 is placed on the end structure 144, and the water discharge portion 170 is screwed onto the tubular portion 130.

[0142] When the anti-freeze device 105 is assembled, the force of the spring 180 presses the sealing portion 148 against the upper end of the small diameter portion 122-2, sealing the upper end of the water guide hole 126 and filling the space S with water.

[0143] To fill the space S with water, the shaft-shaped part 120 and the cylindrical part 130 are attached to the base part 110 (the shaft-shaped part 120 and the cylindrical part 130 attached to the base part 110 are considered to be in a semi-assembled state), and are submerged in water (for example, water in a container). At this time, the screw 125 is removed from the large diameter part 122-1 and the cylindrical part 130. Then, the gap between the cylindrical part 130 and the small diameter part 122-2 is filled with water, and when the gap is filled with water, the semi-assembled part is pulled up from the water, and the cylindrical body 142 of the reciprocating body 140 is inserted into the gap between the cylindrical part 130 and the small diameter part 122-2. Then, the water is pushed by the end of the cylindrical body 142 and discharged from the L-shaped hole 122b. By forming the diameter of the L-shaped hole 122b small, water will not be discharged from the L-shaped hole 122b just by the water being in the gap, but will be discharged by pushing the water in with the cylindrical body 142. Then, when the sealing part 148 comes into contact with the tip of the small diameter part 122-2 and the reciprocating body 140 reaches the back, the screw 125 is screwed into the horizontal hole of the L-shaped hole 122b. In this way, the space S can be filled with water and sealed.

[0144] In addition, even if the diameter of L-shaped hole 122b is not sufficiently narrow and water leaks out from the gap when base portion 110 side is turned downward, the semi-assembled product can be submerged in water and with water entering the gap between tubular portion 130 and small diameter portion 122-2, tubular body 142 of reciprocating body 140 can be lightly inserted into the gap between tubular portion 130 and small diameter portion 122-2 (i.e., so that water will not leak out from the gap even if reciprocating body 140 is turned downward and pulled up), and reciprocating body 140 can be pulled out of the water with the side of reciprocating body 140 facing downward, and the water can be drained from L-shaped hole 122b by pushing in reciprocating body 140, and once reciprocating body 140 has reached the back, screw 125 can be screwed in.

[0145] 13, when the anti-freeze device 105 is assembled, the cylindrical portion 130 is disposed on the outside of the shaft portion 120, and a space S is provided between the shaft portion 120 (particularly the small diameter portion 122-2) and the cylindrical portion 130. The reciprocating body 140 is biased downward by the spring 180, so that the sealing portion 148 comes into contact with the upper end of the small diameter portion 122-2 (thereby, the reciprocating body 140 is at the lower end position of its moving range), and the upper end of the small diameter portion 122-2 is sealed. In other words, in the initial position of the reciprocating body 140 in which the sealing portion 148 comes into contact with the upper end of the small diameter portion 122-2, the upper end of the water guide hole 126 is sealed.

[0146] A description will now be given of the usage state of the anti-freezing device 105. Before using the anti-freezing device 105, the space S is filled with water as described above.

[0147] Next, as in the case of the freeze prevention device 5, the water pipes 100 are connected to the water passage hole 116 of the base part 110 from both sides as shown in Fig. 15. That is, one water pipe 100 is screwed into the threaded part 116a, and the other water pipe 100 is screwed into the threaded part 116b. The water pipe 100 and the freeze prevention device 105 connected to the base part 110 are to be installed outdoors on the ground.

[0148] As shown in FIG. 15, the position of the reciprocating body 140 when it is at the lower end and the sealing portion 148 is in contact with the small diameter portion 122-2 to seal the upper end of the water guide hole 126 is defined as the initial position, while the position of the reciprocating body 140 when it has risen and water is being discharged from the discharge hole 174a is defined as the water discharge position.

[0149] Here, when the outside air temperature is high, the water in the space S does not freeze, so the reciprocating body 140 is in the initial position, and the sealing portion 148 seals the upper end of the water guide hole 126, so that the water in the water guide hole 126 is not discharged from the discharge hole 174a. The state in which the reciprocating body 140 is in the initial position is the initial state of the reciprocating body 140.

[0150] On the other hand, when the outside air temperature drops, for example from sunset to late night, and the water in space S freezes, the water (specifically, ice) in space S expands, and the reciprocating body 140 is pushed by the frozen water and moves upward against the biasing force of spring 180, as shown in FIG. 16, and a gap is formed between the upper end of small diameter portion 122-2 and the lower end of sealed portion 148, so that the water in water guide hole 126 passes through insertion hole 146-3 of end structure 144 and reaches water discharge portion 170, and the water in water discharge portion 170 is discharged from discharge hole 174a.

[0151] Even if the spring 180 shrinks vertically and no gaps are formed on the sides of the spring 180, the insertion hole 146-3 is formed to the inside of the spiral filament member that constitutes the spring 180 in a plan view of the anti-freezing device 105, so the water in the insertion hole 146-3 can be discharged from the discharge hole 174a through the space inside the spring 180. As a result, the water in the water guide hole 126 moves as the water is discharged, so the water in the water guide hole 126 does not freeze, and further, the water in the water pipe 100 also moves as the water is discharged, so the water in the water pipe 100 does not freeze either.

[0152] In addition, since the water in water guide hole 126 is farther from the outside air than space S, the water in water guide hole 126 is not frozen at the time the water in space S freezes. In particular, since tubular part 130 is made of copper and has high thermal conductivity, the water in space S that contacts the inner circumferential surface of tubular part 130 freezes quickly and can be drained before the water in water guide hole 126 freezes.

[0153] In addition, at the stage where the water in the space S freezes, the water in the water guide hole 126 is also cooled, so the temperature of the water in the water guide hole 126 is lower than the temperature of the water in the water pipe 100. In other words, when the anti-freezing device 105 is placed on the ground, even if the temperature of the part of the water pipe 100 placed on the ground, including the part connected to the base 110, is low, the temperature of at least the part of the water pipe placed underground is high, since the water pipe is generally placed underground. Note that the part of the water pipe placed on the ground up to the connection to the base 110 is exposed to the outside air, but by wrapping it with a heat insulating material, etc., it is possible to prevent the water in the part placed on the ground from freezing, even at the stage where the water in the space S freezes.

[0154] Then, as the water in the water guide hole 126 is discharged, the water in the water pipe 100 flows into the water guide hole 126, but since the temperature of the water in the water pipe 100, particularly the temperature of the water that was in the underground water pipe, is high (at least higher than the temperature of the water in the water guide hole 126 when the water in the space S freezes), the heat from the water in the water guide hole 126 melts the ice in the space S. As a result, the volume of the water in the space S returns to its original value, and the reciprocating body 140 descends and returns to the initial position in Fig. 15, so that the discharge of water from the discharge hole 174a stops. In other words, even if the outside air temperature remains low, once the water in the space S melts, the discharge of water stops.

[0155] Thereafter, if the outside air temperature remains low, the water in space S will freeze again, and the water (specifically, ice) in space S will expand and rise up reciprocating body 140 to the water discharge position, where the water will be discharged from discharge hole 174a. As a result, the water in water guide hole 126 will move, so the water in water guide hole 126 will not freeze, and furthermore, the water in water pipe 100 will not freeze either. Thereafter, similarly, the ice in space S will melt due to the temperature of the water in the water pipe, so reciprocating body 140 will descend, and the discharge of water will stop.

[0156] As described above, even if the outside air temperature remains low, the water in the space S freezes and melts repeatedly, causing the reciprocating body 140 to repeatedly rise and fall, and water is discharged from the discharge hole 174a only when the reciprocating body 140 rises. This makes it possible to prevent water bills from becoming expensive by not constantly draining water, even if the temperature remains low.

[0157] When the outside air temperature rises, such as when morning arrives, the water in the space S does not freeze, and so the water is not discharged from the discharge hole 174a.

[0158] In the above explanation, the anti-freezing device 105 is connected to the water pipe 100 with the base part 110 facing downward, but as in the case of the anti-freezing device 5, since water is discharged from the discharge hole 174a as described above, there is a risk that the discharged water may splash onto the anti-freezing device 105. There is no particular problem if water splashes onto the anti-freezing device 105, but in order to prevent water from splashing onto it, it is possible to install the anti-freezing device 105 so that the base part 110 faces upward (i.e., the anti-freezing device 105 is hung from the water pipe 100) or to install the anti-freezing device 105 sideways (in which case the water pipe 100 is vertical).

[0159] In the above description, the spring 180 is provided inside the water discharge portion 170, but an elastic member other than a spring (coil spring) may be used. For example, any member having elasticity (i.e., elasticity in the vertical direction (axial direction)) such as a cylindrical rubber material or a cylindrical synthetic resin material may be used. In other words, any elastic member that urges the end constituent 144 downward between the wall member 174 (specifically, the lower end of the wall member 174) and the end constituent 144 (specifically, the upper surface (area other than the convex portion 146-2) of the end constituent 144) may be used. When a cylindrical elastic member is used, a gap is provided between the inner position of the elastic member and the inner position of the insertion hole 146-3 as described above so that water can pass through the inside of the elastic member, or an opening or cutout portion for water to pass through is provided in the lower end area of ​​the cylindrical elastic member.

[0160] Also, although it has been described that the cylindrical portion 130 is made of copper and each portion other than the cylindrical portion 130 (excluding the sealed portion 148) is made of stainless steel, the material of the cylindrical portion 130 may be any material having a higher thermal conductivity than each portion other than the cylindrical portion 130, for example, silver (428 (W / m·K) at 0°C) or gold (319 (W / m·K) at 0°C). In other words, it is sufficient for the cylindrical portion 130 to be made of a metal having a higher thermal conductivity than the shaft portion 120, the reciprocating body 140, etc., but copper is preferable from the standpoint of cost.

[0161] Even if the cylindrical portion 130 is not made of a material with high thermal conductivity such as copper, the space S is located inside the cylindrical portion 130 and is located closer to the external environment than the water guide hole 126, so that the water in the space S freezes faster than the water in the water guide hole 126, and the water in the space S freezes and expands due to the same action as described above, so that the water in the water guide hole 126 can be discharged. That is, for example, the cylindrical portion 130 may be made of stainless steel like the other members. However, by making the cylindrical portion 130 from a material with high thermal conductivity such as copper and forming each portion other than the cylindrical portion 130 from a metal with lower thermal conductivity than copper, the water in the space S can be frozen early and reliably discharged before the water in the water guide hole 126 starts to freeze.

[0162] Furthermore, although the cylindrical portion 130 has been described as having a hole for inserting the screw 125 therethrough, a notch formed in the lower end of the cylindrical portion 130 may be used instead.

[0163] In addition, in the above explanation, it is described that the water pipe 100 is connected to the base portion 110 of the anti-freeze device 105, but it may be a pipe that carries water other than a water pipe, and as in the case of the anti-freeze device 5, as a result, the anti-freeze device 105 may prevent the freezing of a water-carrying pipe, which is a water pipe or other water-carrying pipe, and by connecting the water-carrying pipe to the anti-freeze device 105, the water-carrying pipe can be prevented from freezing.

[0164] Also, for example, a snow melting pipe buried in the ground, which is built up from underground and passes groundwater, can be connected to the anti-freezing device 105 so that the anti-freezing device 105 protrudes upward from the ground surface, thereby preventing the snow melting pipe from freezing, and the water discharged from the water discharge part 170 can be made to flow onto the road surface to prevent the road surface from freezing. This prevents water from constantly flowing onto the road surface as in conventional snow melting pipes, thereby reducing the consumption of groundwater. Note that since the water in the space S is more likely to freeze when the anti-freezing device 105 is installed exposed from the ground surface, it is preferable to lengthen the length of the protruding part 114 of the base part 110 and expose the entire tubular part 130 (the entire length in the vertical direction) from the ground surface.

[0165] In addition, in the above description, the liquid filled in the space S is water, but any liquid other than water may be used as long as it expands when frozen.

[0166] In the anti-freeze device 105, the upper end of the water guide hole 126 is sealed by the sealing portion 148, and the water in the water guide hole 126 is drained by raising the reciprocating body 140. Therefore, a gap is created between the sealing portion 148 and the upper end of the small diameter portion 122-2 by merely raising the reciprocating body 140 slightly, allowing the water to be drained. As a result, the water in the space S expands only slightly, allowing the water in the water guide hole 126 to be drained quickly before it freezes.

[0167] In other words, in the case of anti-freeze device 5, water cannot be discharged unless drain hole 52 rises to the position of drain hole 74, but in the case of anti-freeze device 105, water can be discharged by only slightly raising reciprocating body 140, and even if the outside air temperature drops rapidly, the risk of water in water guide hole 126 freezing before it can be discharged can be prevented, and at least, compared to anti-freeze device 5, the risk of water in water guide hole 126 freezing before it can be discharged can be reduced.

[0168] Furthermore, in the anti-freeze device 105, by configuring the shaft body 122 of the shaft portion 120 with a large diameter portion 122-1 and a small diameter portion 122-2, the vertical length of the space S can be made shorter than in the anti-freeze device 5, and as a result, the amount (volume) of liquid filled in the space S can be reduced, so that the liquid in the space S can be quickly frozen and the reciprocating body 140 can be raised to discharge the water from the discharge hole 174a, and the water in the water guide hole 126 can be quickly discharged from the discharge hole 174a before it freezes. [Explanation of symbols]

[0169] 5 Antifreeze device 10 Base 12 Base unit body 14 Protruding part 14a Threaded part 14b L-shaped hole 15 bis 16 Water passage hole 20 Shaft-shaped part 22 Shaft-shaped body 22a, 22b groove 23a, 23b O-ring 24 Connection 24a Threaded part 26 Water Conduit Hole 30 Cylindrical section 30a, 30b Threaded portion 32 Hole 40 Shuttle vehicle 42 Large diameter section 42a, 42b Groove 43a, 43b O-ring 44 Small diameter section 44a, 44b Groove 45a, 45b O-ring 46 Tip 48 Insertion Hole 49 Water Conduit Hole 50 Wall 52 Discharge hole 52a, 52b, 52c, 52d holes 60 Covering 62 Insertion hole 60a, 60b Threaded portion 70 Water discharge part 70a Threaded part 71 Inner peripheral surface 72 Insertion hole 74 Discharge hole 74a, 74b, 74c, 74d, 74e, 74f, 74g, 74h Hole 80 Spring 105 Antifreeze device 110 Base 112 Base body 114 Protrusion 116 Water passage hole 114a Threaded part 120 Shaft-shaped part 122 Shaft-shaped body 122-1 Large diameter section 122-2 Small diameter section 122b L-shaped hole 123a O-ring 124 Connection 124a Threaded part 125 bis 126 Water Conduit Hole 130 Cylindrical part 130a Threaded part 140 Shuttle Vehicle 140a O-ring 142 Cylindrical body 144 End structure 146 Main body 146-1 Recess 146-2 Convex 146-3 Insertion hole 148 Sealed part 149 Sealing part mounting part 170 Water discharge section 172 Water discharge unit body 172-1 Large diameter hole 172-2 Small diameter hole 174 Wall components 174a Drain hole Space S

Claims

1. A freeze prevention device for preventing freezing of water pipes, The device has a base portion (10), an axial portion (20), a cylindrical portion (30), a reciprocating body (40), a cover ring (60), a water discharge portion (70), and a coil spring (80), The base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward the upper surface of the base portion, the cylindrical portion is cylindrical and is provided on the upper surface of the base portion facing upward; the shaft-like portion is axially shaped and is provided on the upper surface of the base portion, facing upward inside the cylindrical portion, the shaft-like portion is provided with a second water guide hole (26) penetrating from the upper end to the lower end of the shaft-like portion along the axis of the shaft-like portion, the second water guide hole communicates with the first water guide hole, and a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-like portion; The reciprocating body has a large diameter portion (42) and a small diameter portion (44) connected to the upper side of the large diameter portion and formed with an outer diameter smaller than that of the large diameter portion, the large diameter portion is provided with an insertion hole (48) into which the shaft-shaped portion is inserted, the outer peripheral surface of the shaft-shaped portion contacts the inner peripheral surface of the insertion hole, and the outer peripheral surface of the large diameter portion contacts the inner peripheral surface of the cylindrical portion, In the reciprocating body, a third water guide hole (49) having a smaller diameter than the insertion hole is provided upward from the position of the wall portion (50) which is the upper end of the insertion hole, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, A first discharge hole (52) is provided above the third water guide hole and opens onto a side surface of the reciprocating body. The coil spring is provided along the outer circumferential surface of the small diameter portion between the lower end of the water discharge portion and the upper end of the large diameter portion, The cover ring is cylindrical and is connected to an upper end region of an outer circumferential surface of the cylindrical portion and is provided facing upward. The water discharge portion is connected to an upper end region of an inner peripheral surface of the cover ring, and the water discharge portion is provided with an insertion hole (72) through which the reciprocating body is inserted, and the water discharge portion is provided with a second discharge hole (74) formed from the inner peripheral surface of the insertion hole to the outer peripheral surface of the water discharge portion, When the space (S) formed by the gap between the inner surface of the cylindrical portion and the outer surface of the axial portion is filled with water, water pipes are connected to the two openings of the water passage hole in the base portion, and in the initial state of the reciprocating body, the opening of the first discharge hole faces the inner surface of the insertion hole of the water discharge portion, so that discharge of water from the first discharge hole is stopped. Meanwhile, when the anti-freeze device is cooled, the water in the space freezes and expands, causing the reciprocating body to move upward against the biasing force of the coil spring, and the first discharge hole reaches the position of the second discharge hole, so that water is discharged from the second discharge hole via the first discharge hole. This anti-freezing device is characterized in that water at a temperature at which the ice in the space melts is introduced from a water pipe into the second water guide hole, causing the ice in the space to melt and the reciprocating body to return to its initial position by the force of the coil spring.

2. A freeze prevention device that prevents freezing of water pipes and other water-carrying pipes, The device has a base portion (10), a shaft portion (20), a cylindrical portion (30), a reciprocating body (40), a cover ring (60), a water discharge portion (70), and an elastic member (80), The base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward the upper surface of the base portion, the cylindrical portion is cylindrical and is provided on the upper surface of the base portion facing upward; the shaft-like portion is axially shaped and is provided on the upper surface of the base portion, facing upward inside the cylindrical portion, the shaft-like portion is provided with a second water guide hole (26) penetrating from the upper end to the lower end of the shaft-like portion along the axis of the shaft-like portion, the second water guide hole communicates with the first water guide hole, and a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-like portion; The reciprocating body has a large diameter portion (42) and a small diameter portion (44) connected to the upper side of the large diameter portion and formed with an outer diameter smaller than that of the large diameter portion, the large diameter portion is provided with an insertion hole (48) into which the shaft-shaped portion is inserted, the outer peripheral surface of the shaft-shaped portion contacts the inner peripheral surface of the insertion hole, and the outer peripheral surface of the large diameter portion contacts the inner peripheral surface of the cylindrical portion, In the reciprocating body, a third water guide hole (49) having a smaller diameter than the insertion hole is provided upward from the position of the wall portion (50) which is the upper end of the insertion hole, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, A first discharge hole (52) is provided above the third water guide hole and opens onto a side surface of the reciprocating body. The elastic member is provided between the water discharge portion and the large diameter portion and biases the large diameter portion downward. The cover ring is cylindrical and is connected to an upper end region of an outer circumferential surface of the cylindrical portion and is provided facing upward. The water discharge portion is connected to an upper end region of an inner peripheral surface of the cover ring, and the water discharge portion is provided with an insertion hole (72) through which the reciprocating body is inserted, and the water discharge portion is provided with a second discharge hole (74) formed from the inner peripheral surface of the insertion hole to the outer peripheral surface of the water discharge portion, When the space (S) formed by the gap between the inner surface of the cylindrical portion and the outer surface of the axial portion is filled with water, water pipes are connected to the two openings of the water passage holes in the base portion, and in the initial state of the reciprocating body, the opening of the first discharge hole faces the inner surface of the insertion hole of the water discharge portion, so that discharge of water from the first discharge hole is stopped. Meanwhile, when the anti-freeze device is cooled, the water in the space freezes and expands, causing the reciprocating body to move upward against the biasing force of the elastic member, and the first discharge hole reaches the position of the second discharge hole, so that water is discharged from the second discharge hole via the first discharge hole. This anti-freezing device is characterized in that water at a temperature that melts the ice in the space is introduced from the water pipe into the second water guide hole, causing the ice in the space to melt and the reciprocating body to return to its initial position by the force of the elastic member.

3. The anti-freeze device according to claim 1 or 2, characterized in that the water discharge portion has a first threaded portion (70a) in a lower end region and the cover ring has a second threaded portion (60b) in an upper end region, the water discharge portion is connected to the cover ring by engaging the first threaded portion with the second threaded portion, and the vertical position of the water discharge portion relative to the cover ring is adjusted by adjusting the engagement position of the first threaded portion relative to the second threaded portion.

4. A freeze prevention device for preventing freezing of water pipes, The device has a base portion (10), an axial portion (20), a cylindrical portion (30), a reciprocating body (40), a cover ring (60), and a water discharge portion (70), The base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward the upper surface of the base portion, the cylindrical portion is cylindrical and is provided on the upper surface of the base portion facing upward; the shaft-like portion is axially shaped and is provided on the upper surface of the base portion, facing upward inside the cylindrical portion, the shaft-like portion is provided with a second water guide hole (26) penetrating from the upper end to the lower end of the shaft-like portion along the axis of the shaft-like portion, the second water guide hole communicates with the first water guide hole, and a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-like portion; The reciprocating body has a gap insertion portion (42-1) formed in a cylindrical shape, and an insertion hole (48) into which the shaft-shaped portion is inserted is provided on the inside of the gap insertion portion, and the inner peripheral surface of the insertion hole is in contact with the outer peripheral surface of the shaft-shaped portion, and the outer peripheral surface of the gap insertion portion is in contact with the inner peripheral surface of the cylindrical portion, In the reciprocating body, a third water guide hole (49) having a smaller diameter than the insertion hole is provided upward from the position of the wall portion (50) which is the upper end of the insertion hole, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, A first discharge hole (52) is provided above the third water guide hole and opens onto a side surface of the reciprocating body. The cover ring is cylindrical and is connected to an upper end region of an outer circumferential surface of the cylindrical portion and is provided facing upward. The water discharge portion is connected to an upper end region of an inner peripheral surface of the cover ring, and the water discharge portion is provided with an insertion hole (72) through which the reciprocating body is inserted, and the water discharge portion is provided with a second discharge hole (74) formed from the inner peripheral surface of the insertion hole to the outer peripheral surface of the water discharge portion, When the space (S) formed by the gap between the inner surface of the cylindrical portion and the outer surface of the axial portion is filled with water, water pipes are connected to the two openings of the water passage hole in the base portion, and in the initial state of the reciprocating body, the opening of the first discharge hole faces the inner surface of the insertion hole of the water discharge portion, so that discharge of water from the first discharge hole is stopped. Meanwhile, when the anti-freeze device is cooled, the water in the space freezes and expands, causing the reciprocating body to move upward, and the first discharge hole reaches the position of the second discharge hole, so that water is discharged from the second discharge hole via the first discharge hole. This anti-freezing device is characterized in that water at a temperature at which the ice in the space melts is introduced from a water pipe into the second water introduction hole, thereby melting the ice in the space and causing the reciprocating body to return to its initial position.

5. A freeze prevention device that prevents freezing of water pipes and other water-carrying pipes, The device has a base portion (10), an axial portion (20), a cylindrical portion (30), a reciprocating body (40), a cover ring (60), and a water discharge portion (70), The base portion has a water passage hole (16) between two openings provided on the side surface, and a first water guide hole (18) formed from the water passage hole toward the upper surface of the base portion, the cylindrical portion is cylindrical and is provided on the upper surface of the base portion facing upward; the shaft-like portion is axially shaped and is provided on the upper surface of the base portion, facing upward inside the cylindrical portion, the shaft-like portion is provided with a second water guide hole (26) penetrating from the upper end to the lower end of the shaft-like portion along the axis of the shaft-like portion, the second water guide hole communicates with the first water guide hole, and a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-like portion; The reciprocating body has a gap insertion portion (42-1) formed in a cylindrical shape, and an insertion hole (48) into which the shaft-shaped portion is inserted is provided on the inside of the gap insertion portion, and the inner peripheral surface of the insertion hole is in contact with the outer peripheral surface of the shaft-shaped portion, and the outer peripheral surface of the gap insertion portion is in contact with the inner peripheral surface of the cylindrical portion, In the reciprocating body, a third water guide hole (49) having a smaller diameter than the insertion hole is provided upward from the position of the wall portion (50) which is the upper end of the insertion hole, and in an initial state of the reciprocating body in which the upper end of the shaft-shaped portion is in contact with the wall portion, the third water guide hole communicates with the second water guide hole, A first discharge hole (52) is provided above the third water guide hole and opens onto a side surface of the reciprocating body. The cover ring is cylindrical and is connected to an upper end region of an outer circumferential surface of the cylindrical portion and is provided facing upward. The water discharge portion is connected to an upper end region of an inner peripheral surface of the cover ring, and the water discharge portion is provided with an insertion hole (72) through which the reciprocating body is inserted, and the water discharge portion is provided with a second discharge hole (74) formed from the inner peripheral surface of the insertion hole to the outer peripheral surface of the water discharge portion, When the space (S) formed by the gap between the inner surface of the cylindrical portion and the outer surface of the axial portion is filled with water, water pipes are connected to the two openings of the water passage holes in the base portion, and in the initial state of the reciprocating body, the opening of the first discharge hole faces the inner surface of the insertion hole of the water discharge portion, so that water discharge from the first discharge hole is stopped. Meanwhile, when the anti-freeze device is cooled, the water in the space freezes and expands, causing the reciprocating body to move upward, and the first discharge hole reaches the position of the second discharge hole, so that water is discharged from the second discharge hole via the first discharge hole. This anti-freezing device is characterized in that water at a temperature at which the ice in the space melts is introduced from the water pipe into the second water guide hole, whereby the ice in the space melts and the reciprocating body returns to its initial position.

6. The base portion has a base portion body (12) in which the water passage hole is provided, and a protrusion portion (14) provided on the upper surface of the base portion body, and a first water guide hole is opened on the upper surface of the protrusion portion, the cylindrical portion is screwed onto an outer circumferential surface of the protruding portion, and the shaft portion is screwed onto an inner circumferential surface of the first water guide hole; A communication hole (14b) is provided in the protruding portion between the outer peripheral surface of the protruding portion and the upper surface of the protruding portion, and the communication hole communicates with the space between the cylindrical portion and the shaft portion.

6. The freeze prevention device according to claim 1, 2, 4 or 5, characterized in that a plug (15) for closing an opening of the communication hole on the outer circumferential surface side of the protruding portion is detachably provided.

7. 6. The freeze prevention device according to claim 1, 2, 4 or 5, wherein the cylindrical portion is formed of a metal having a higher thermal conductivity than the shaft portion and the reciprocating body.

8. A freeze prevention device as described in claim 1, 2, 4 or 5, characterized in that the cylindrical portion is formed of copper, and the base portion, the axial portion, the reciprocating body, the covering and the water discharge portion are formed of a metal having a lower thermal conductivity than copper.

9. A freeze prevention device that prevents freezing of water pipes and other water-carrying pipes, The device has a base portion (110), a shaft portion (120), a cylindrical portion (130), a reciprocating body (140), a water discharge portion (170), and an elastic member (180), The base portion has a water passage hole (116) between two openings provided on the side surface, and a first water guide hole (118) formed from the water passage hole toward the upper surface of the base portion, the cylindrical portion is cylindrical and is provided on the upper surface of the base portion facing upward; the shaft-like portion is axially shaped and is provided on the upper surface of the base portion, facing upward inside the cylindrical portion, the shaft-like portion is provided with a second water guide hole (126) penetrating from the upper end to the lower end of the shaft-like portion along the axis of the shaft-like portion, the second water guide hole communicates with the first water guide hole, and a gap is formed between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft-like portion; The reciprocating body has a cylindrical body (142) formed in a cylindrical shape and an end structure (144) provided at an upper end of the cylindrical body, An insertion hole (145) into which the shaft-shaped portion is inserted is provided on the inside of the cylindrical body, and the inner peripheral surface of the cylindrical body contacts the outer peripheral surface of the shaft-shaped portion, and the outer peripheral surface of the cylindrical body contacts the inner peripheral surface of the cylindrical portion, The end construct has an insertion hole (146-3) for passing water from the second water guide hole upward, and also has a sealing portion (148) for closing the upper end of the second water guide hole of the shaft-shaped portion, The water discharge portion has a cylindrical water discharge portion main body (172) connected to an upper region of the outer circumferential surface of the cylindrical portion, and a wall member (174) provided on the side opposite to the base portion side of the water discharge portion main body and provided with a water discharge hole (174a) having a diameter smaller than the inner diameter of the water discharge portion main body; The elastic member is disposed between the wall member and the end structure, With the space (S) formed by the gap between the inner surface of the cylindrical portion and the outer surface of the axial portion filled with liquid, water pipes are connected to the two openings of the water passage hole in the base portion, and in the initial state of the reciprocating body, the sealing portion blocks the upper end of the second water guide hole in the axial portion due to the biasing force of the elastic member, and discharge from the water drain hole is stopped; on the other hand, when the anti-freeze device is cooled, the liquid in the space freezes and expands, causing the reciprocating body to be pushed by the frozen liquid and move upward against the biasing force of the elastic member, forming a gap between the sealing portion and the upper end of the second water guide hole in the axial portion, and water in the second water guide hole is discharged from the water drain hole through the insertion hole of the end component portion; This anti-freezing device is characterized in that water at a temperature at which the frozen liquid in the space melts is introduced from the water pipe into the second water guide hole, causing the frozen liquid in the space to melt and the reciprocating body to return to its initial position due to the biasing force of the elastic member.

10. The anti-freezing device according to claim 9, characterized in that the shaft-shaped portion has a small diameter portion (122-2) provided on the upper side of the shaft-shaped portion and a large diameter portion (122-1) connected downward from the small diameter portion, the outer diameter of the small diameter portion is formed smaller than the outer diameter of the large diameter portion, the outer peripheral surface of the large diameter portion contacts the inner peripheral surface of the cylindrical portion, and a space for putting liquid is formed in the gap between the outer peripheral surface of the small diameter portion and the inner peripheral surface of the cylindrical portion.

11. A communication hole (122b) is provided in the large diameter portion between an outer circumferential surface of the large diameter portion and an upper surface of the large diameter portion, and the communication hole communicates with the space between the cylindrical portion and the small diameter portion; 11. The freeze prevention device according to claim 10, wherein a plug (125) for closing an opening of the communication hole on the outer circumferential surface side of the large diameter portion is detachably provided.

12. 12. An anti-freeze device as described in claim 9, 10 or 11, characterized in that the elastic member is formed by a coil spring formed from a spiral filament member, and in a planar perspective view of the anti-freeze device, the insertion hole of the end structure is formed to the inside of the spiral filament member that constitutes the coil spring, so that the insertion hole communicates with the space inside the coil spring and the space inside the coil spring communicates with a discharge hole provided in the wall member.

13. The base portion has a base portion body (12) in which the water passage hole is provided, and a protrusion portion (14) provided on the upper surface of the base portion body, and a first water guide hole is opened on the upper surface of the protrusion portion, 12. The freeze prevention device according to claim 9, 10 or 11, wherein the cylindrical portion is screwed onto an outer circumferential surface of the protruding portion, and the shaft portion is screwed onto an inner circumferential surface of the first water guide hole.

14. The anti-freeze device according to claim 9, 10 or 11, characterized in that the cylindrical portion is formed from a metal having a higher thermal conductivity than the shaft portion and the end components of the reciprocating body excluding the cylindrical body and the sealing portion.

15. The anti-freeze device according to claim 9, 10 or 11, characterized in that the cylindrical portion is formed of copper, and the base portion, the axial portion, the end structure of the reciprocating body excluding the cylindrical body and the sealing portion, and the water discharge portion are formed of a metal having a thermal conductivity lower than that of copper.

16. 12. An antifreeze device according to claim 9, 10 or 11, characterized in that the liquid is water.

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