Anti-freezing device for drain pipe of water chiller-heater unit
By designing an anti-freeze device including a drainage pipe, a conical insulation sleeve and a sleeve in the hot and cold water unit, the problems of frozen drainage pipes and hidden safety hazards of high-temperature medium heating are solved, achieving effective anti-freezing and safety improvement. .
Patent Information
- Application Number
- CN202411465464.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-01-21
AI Technical Summary
In existing hot and cold water units, the drain pipes are prone to freeze and cracking in low temperature environments, resulting in damage to the unit. At the same time, there are safety hazards for heating the drain pipes with high-temperature medium.
Design a freeze protection device that includes a drain pipe, conical insulation sleeve, and sleeve. The tapered heat insulation sleeve is connected and fixed to the drainage pipe, and the sleeve is set on the drainage pipe. Through the cooperation of the limiter and the blocking piece, the contact range between the high-temperature medium and the drainage pipe is controlled to achieve temperature regulation.
Effectively prevent frozen drainage pipes, avoid damage to the unit, and reduce the temperature of the drainage pipe and drainage valve by controlling the contact range of the high temperature medium, and improve the safety.
Smart Images
Figure CN119333658A_ABST
Abstract
Description
Technical Field
[0001] The invention discloses a device for preventing freezing of drainage pipes of cold and hot water units, belonging to the field of cold and hot water units. Background Art
[0002] The function of the drain pipe in the hot and cold water unit is to drain the circulating water when not in use. Since the circulating water does not flow in the drain pipe, when the ambient temperature is below 0℃, the circulating water temperature in the drain pipe will drop as the ambient temperature drops until it freezes. When it freezes to a certain degree, the drain pipe may be frozen and cracked, causing damage to the unit. Using the high-temperature medium discharged from the compressor in the hot and cold water unit to heat the drain pipe is one of the ways to prevent the drain pipe from freezing. That is, a sleeve is set on the drain pipe so that the high-temperature medium discharged from the compressor flows into the space formed by the sleeve and the drain pipe, so that the high-temperature medium discharged from the compressor heats the drain pipe. Then the high-temperature medium discharged from the compressor enters the condenser from the space formed by the sleeve and the drain pipe. Because the high-temperature medium discharged from the compressor has a high temperature, it will cause the drain pipe, drain valve, etc. to be in a high-temperature state, affecting the seal in the drain valve, the seal and connection strength of the drain pipe connection, and scalding accidents will occur due to the high temperature of the drain valve when operating the drain valve, which poses a safety hazard. Summary of the invention
[0003] In view of the deficiencies in the prior art, the present invention aims to provide a device for preventing freezing of drain pipes of hot and cold water units to solve the problems raised in the above-mentioned background technology.
[0004] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a device for preventing freezing of drain pipes of hot and cold water units, comprising a drain pipe, an internal thread is processed at the upper position of the drain pipe, a drain valve is installed at the lower end of the drain pipe, a conical heat-insulating sleeve which is narrow at the top and wide at the bottom is sleeved on the drain pipe, the conical heat-insulating sleeve is connected and fixed to the drain pipe, a sleeve is sleeved on the conical heat-insulating sleeve, an upper conical hole which is narrow at the top and wide at the bottom is opened at the middle position of the upper surface of the sleeve, a lower conical hole which is narrow at the top and wide at the bottom is opened at the middle position of the lower surface of the sleeve, the upper end of the conical heat-insulating sleeve passes through the upper conical hole, and the conical heat-insulating sleeve The lower end passes through the lower conical hole, and a first straight pipe is installed on the outer surface of the lower end of the sleeve, and a first stop valve for connecting the discharge end of the compressor in the hot and cold water unit is installed on the end of the first straight pipe away from the sleeve. A second straight pipe is installed on the outer surface of the upper end of the sleeve, and a second stop valve for connecting the inlet end of the condenser is installed on the end of the second straight pipe away from the sleeve. A limiter for limiting the relative position of the sleeve and the drain pipe is installed between the first straight pipe and the lower end of the drain pipe, and two rows of through openings are opened on the outer surface of the conical insulation sleeve from top to bottom, and two rows of blocking members for blocking the through openings are installed on the outer surface of the sleeve from top to bottom.
[0005] Specifically, the limiting member includes a support plate, a support plate is provided on the lower side of the conical insulation sleeve, a circular opening is opened on one side of the upper surface of the support plate, the lower end of the drain pipe passes through the circular opening and the drain pipe is fixedly connected to the support plate, a stud is rotatably connected to the outer surface of the first straight pipe, a vertical screw hole is opened on the side of the upper surface of the support plate away from the circular opening, the lower end of the stud is threadedly connected in the vertical screw hole, and a handle is installed on the outer surface of the upper end of the stud.
[0006] Specifically, a ring is provided on the first straight tube and is connected and fixed to the first straight tube. The lower position of the outer surface of the ring is connected and fixed to a limiting sleeve. A through hole is opened in the middle position of the lower surface of the limiting sleeve. The upper end of the stud passes through the through hole and is connected and fixed to a limiting head. The limiting head is slidably installed in the limiting sleeve, and the cross-sections of the limiting head and the limiting sleeve are both circular.
[0007] Specifically, the sealing member includes a straight cylinder, and two rows of rectangular holes are equidistantly opened on the outer surface of the cylinder sleeve from top to bottom, a straight cylinder is provided on the outside of the rectangular hole, one end of the straight cylinder is connected and fixed to the cylinder sleeve, a rectangular rod is inserted in the rectangular hole, one end of the rectangular rod extends into the cylinder sleeve and is connected and fixed with a blocking block for blocking the opening, the end of the rectangular rod away from the blocking block extends into the straight cylinder, a piston for dividing the internal space of the straight cylinder is installed at the end of the rectangular rod located in the straight cylinder, the piston is slidably installed in the straight cylinder, a spring is provided between the piston and the rectangular hole, the spring is sleeved on the rectangular rod, a cylinder cover is installed at the end of the straight cylinder away from the cylinder sleeve, a horizontal screw hole is opened in the middle of one side surface of the cylinder cover, a screw for squeezing the piston is threadedly connected to the horizontal screw hole, and a knob head is connected and fixed to the end of the screw located on the outside of the straight cylinder.
[0008] Specifically, one end of the straight tube away from the tube sleeve is provided with a connecting ring connected and fixed to the straight tube, a side surface of the connecting ring is provided with a plurality of first small holes equidistantly arranged in a circular shape, a side surface of the tube cover is provided with a plurality of second small holes equidistantly arranged in a circular shape aligned with the first small holes, a screw is inserted in the channel formed by the first small holes and the second small holes, and a nut is threadedly connected to one end of the screw.
[0009] Specifically, a protective disk is connected and fixed to one end of the piston facing the screw, the outer diameter of the protective disk is smaller than the outer diameter of the piston, a plurality of column heads are evenly fixed on one side of the protective disk facing the piston, a plurality of blind holes matching with the column heads are evenly opened on one side of the piston facing the protective disk, and the column heads are glued in the blind holes by glue.
[0010] Specifically, the cross section of the blocking block is rectangular, the cross section of the through opening is rectangular, and a side of the blocking block away from the rectangular rod is processed with an arc surface matching the surface of the drain pipe.
[0011] Specifically, one side of the block facing the rectangular rod is recessed to form a first positioning hole, one side of the piston facing the rectangular rod is recessed to form a second positioning hole, and both ends of the rectangular rod are respectively fixed in the first positioning hole and the second positioning hole.
[0012] Specifically, one end of the first stop valve away from the first straight pipe is sleeved with a first flange connected and fixed to the first stop valve, and one end of the second stop valve away from the second straight pipe is sleeved with a second flange connected and fixed to the second stop valve.
[0013] Beneficial effects of the present invention:
[0014] 1. Put the sleeve on the drain pipe, make the two ends of the conical insulation sleeve pass through the upper conical hole and the lower conical hole respectively, then use the handle to rotate the stud to screw the stud into the vertical screw hole, and then under the pull of the stud, move the sleeve downward to make the conical insulation sleeve fit tightly with the inner wall of the upper conical hole and the inner wall of the lower conical hole, so as to limit the relative position of the sleeve and the drain pipe, complete the assembly of the sleeve and the drain pipe, and facilitate the separate replacement of the sleeve or the drain pipe after the sleeve and the drain pipe are disassembled later.
[0015] 2. After the conical insulation sleeve is tightly fitted with the inner wall of the upper conical hole and the inner wall of the lower conical hole, the sealing between the conical insulation sleeve and the cylinder sleeve is achieved. Under the restriction of the conical insulation sleeve, the contact range between the high-temperature medium discharged from the compressor and the drain pipe is limited. The high-temperature medium discharged from the compressor enters the space formed by the cylinder sleeve and the drain pipe through the channel formed by the first stop valve and the first straight pipe. Then, the high-temperature medium discharged from the compressor contacts the drain pipe through the opening, so that the high-temperature medium discharged from the compressor exchanges heat with the moisture in the drain pipe to prevent the moisture in the drain pipe from freezing. Then, the high-temperature medium discharged from the compressor in the cylinder sleeve and the drain pipe flows into the condenser from the channel formed by the second straight pipe and the second stop valve.
[0016] 3. Use the knob head to turn the screw rod so that the screw rod squeezes the piston. After the piston is squeezed, it drives the rectangular rod to slide along the rectangular hole, so that the block moves into the through-port. At this time, the piston and the sleeve cooperate with each other to squeeze the spring, so that the spring produces elastic deformation. After the block moves into the through-port, the through-port is blocked. Conversely, when the screw rod is turned in the opposite direction, the rectangular rod moves in the opposite direction along the rectangular hole under the action of the spring rebound force, so that the block moves out of the through-port. By adjusting the number of through-ports blocked by the block, the contact range between the high-temperature medium discharged from the compressor and the drain pipe that flows into the space formed by the sleeve and the drain pipe is changed. That is, when the number of through-ports blocked increases, the contact range between the high-temperature medium discharged from the compressor and the drain pipe is reduced, and vice versa. Since the contact range between the high-temperature medium discharged from the compressor and the drain pipe is changed, the temperature of the drain pipe surface can be controlled, so that the temperature of the drain pipe after being heated by the high-temperature medium can be adjusted as needed, so as to avoid high temperatures of components such as the drain pipe and the drain valve, prevent scalding when operating the drain valve, and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:
[0018] Figure 1 It is a structural schematic diagram of a device for preventing freezing of drainage pipes of a hot and cold water unit according to the present invention;
[0019] Figure 2 It is a schematic diagram of the assembly of a conical heat-insulating sleeve, a straight cylinder, a blocking block, a screw rod, a drain valve and a drain pipe in a cold and hot water unit drain pipe antifreeze device of the present invention;
[0020] Figure 3 It is a schematic diagram of assembling a first straight pipe, a second straight pipe and a sleeve in a cold and hot water unit drainage pipe antifreeze device of the present invention;
[0021] Figure 4 It is a cross-sectional view of a cylinder sleeve in a cold and hot water unit drainage pipe antifreeze device of the present invention;
[0022] Figure 5 A three-dimensional diagram of a conical heat-insulating sleeve in a cold and hot water unit drain pipe antifreeze device of the present invention;
[0023] Figure 6 It is a cross-sectional assembly diagram of a blocking block, a rectangular rod, a spring, a piston, a screw rod, a cylinder cover and a straight cylinder in an antifreeze device for a drain pipe of a hot and cold water unit of the present invention;
[0024] Figure 7 It is a schematic diagram of the assembly of a cylinder cover and a straight cylinder in a cold and hot water unit drainage pipe antifreeze device of the present invention;
[0025] Figure 8It is a schematic diagram of the assembly of a blocking block, a piston, a spring and a rectangular rod in a cold and hot water unit drain pipe antifreeze device of the present invention;
[0026] Fig. 9 A three-dimensional diagram of a support plate in a cold and hot water unit drainage pipe antifreeze device of the present invention;
[0027] Fig.10 It is a schematic diagram of the assembly of a limit head, a limit cover and a stud in a cold and hot water unit drain pipe antifreeze device of the present invention;
[0028] In the figure: 1, drain pipe, 2, sleeve, 3, first straight pipe, 4, ring, 5, first stop valve, 6, limit sleeve, 7, stud, 8, support plate, 9, drain valve, 10, straight cylinder, 11, cylinder cover, 12, screw, 13, knob head, 14, second straight pipe, 15, second stop valve, 16, block, 17, conical insulation sleeve, 18, upper conical hole, 19, rectangular hole, 20, lower conical hole, 21, through port, 22, rectangular rod, 23, spring, 24, piston, 25, protective disk, 26, horizontal screw hole, 27, connecting ring, 28, arc surface, 29, round mouth, 30, vertical screw hole, 31, limit head, 32, handle. DETAILED DESCRIPTION
[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.
[0030] See also Figure 1 The present invention provides a technical solution: an antifreeze device for a drain pipe of a hot and cold water unit, comprising a drain pipe 1, an internal thread is processed at the upper position of the drain pipe 1, a drain valve 9 is installed at the lower end of the drain pipe 1, and one end of the drain pipe 1 processed with the internal thread is screwed on the external threaded pipe head on the circulating water pipe in the hot and cold water unit to complete the assembly of the drain pipe 1 and the circulating water pipe in the hot and cold water unit.
[0031] See also Figure 1-Figure 5A conical heat-insulating sleeve 17 with a narrow upper part and a wide lower part is sleeved on the drain pipe 1, and the conical heat-insulating sleeve 17 is connected and fixed to the drain pipe 1. A sleeve 2 is sleeved on the conical heat-insulating sleeve 17, and an upper conical hole 18 with a narrow upper part and a wide lower part is opened in the middle position of the upper surface of the sleeve 2, and a lower conical hole 20 with a narrow upper part and a wide lower part is opened in the middle position of the lower surface of the sleeve 2. The upper end of the conical heat-insulating sleeve 17 passes through the upper conical hole 18, and the lower end of the conical heat-insulating sleeve 17 passes through the lower conical hole 20. A first straight pipe 3 is installed on the outer surface of the lower end of the sleeve 2, and a first stop valve 5 for connecting to the discharge end of the compressor in the hot and cold water unit is installed at one end of the first straight pipe 3 away from the sleeve 2. A second straight pipe 14 is installed on the outer surface of the upper end of the sleeve 2, and a second stop valve 15 for connecting to the inlet end of the condenser is installed at one end of the second straight pipe 14 away from the sleeve 2. The end of the first stop valve 5 away from the first straight pipe 3 is sleeved There is a first flange connected and fixed to the first stop valve 5, and the second stop valve 15 is sleeved at one end away from the second straight pipe 14 with a second flange connected and fixed to the second stop valve 15. The design of the first flange and the second flange facilitates the assembly of the first stop valve 5, the second stop valve 15 and the pipeline for conveying the high-temperature medium discharged from the compressor. The high-temperature medium discharged from the compressor enters the space formed by the sleeve 2 and the drain pipe 1 through the channel formed by the first stop valve 5 and the first straight pipe 3, and then the high-temperature medium discharged from the compressor contacts the drain pipe 1 through the opening 21, so that the high-temperature medium discharged from the compressor exchanges heat with the moisture in the drain pipe 1 to prevent the moisture in the drain pipe 1 from freezing, and then the high-temperature medium discharged from the compressor in the sleeve 2 and the drain pipe 1 flows into the condenser from the channel formed by the second straight pipe 14 and the second stop valve 15.
[0032] See also Figure 1-Figure 5 , Fig. 9 and Fig.10A support plate 8 is provided at the lower side of the conical heat insulation sleeve 17, and a circular opening 29 is provided on one side of the upper surface of the support plate 8. The lower end of the drain pipe 1 passes through the circular opening 29 and the drain pipe 1 is connected and fixed to the support plate 8. A stud 7 is rotatably connected to the outer surface of the first straight pipe 3, wherein the first straight pipe 3 is sleeved with a ring 4 connected and fixed to the first straight pipe 3, and the lower position of the outer surface of the ring 4 is connected and fixed to a limiting sleeve 6, and a through hole is provided at the middle position of the lower surface of the limiting sleeve 6. The upper end of the stud 7 passes through the through hole and is connected and fixed to a limiting head 31, and the limiting head 31 is slidably installed in the limiting sleeve 6. The cross sections of the limiting head 31 and the limiting sleeve 6 are both circular. When the stud 7 is screwed, the stud 7 drives the limiting head 31 to rotate in the space formed by the limiting sleeve 6 and the ring 4, so as to realize the rotational connection between the stud 7 and the first straight pipe 3. A vertical screw hole 30 is provided on the side of the upper surface of the support plate 8 away from the circular opening 29, and the lower end of the stud 7 is threadedly connected to the vertical screw hole 30. A handle 32 is installed on the outer surface of the upper end of 7, so that the sleeve 2 is sleeved on the drain pipe 1, and the two ends of the conical insulation sleeve 17 pass through the upper conical hole 18 and the lower conical hole 20 respectively, and then the stud 7 is rotated by the handle 32 to screw the stud 7 into the vertical screw hole 30, and then under the pulling of the stud 7, the sleeve 2 is moved downward, so that the conical insulation sleeve 17 is tightly fitted with the inner wall of the upper conical hole 18 and the inner wall of the lower conical hole 20, so as to limit the relative position of the sleeve 2 and the drain pipe 1, and complete the assembly of the sleeve 2 and the drain pipe 1, so as to facilitate the subsequent disassembly of the sleeve 2 and the drain pipe 1 and the replacement of the sleeve 2 or the drain pipe 1 separately. After the conical insulation sleeve 17 is tightly fitted with the inner wall of the upper conical hole 18 and the inner wall of the lower conical hole 20, the sealing between the conical insulation sleeve 17 and the sleeve 2 is achieved, and under the restriction of the conical insulation sleeve 17, the contact range between the high-temperature medium discharged from the compressor and the drain pipe 1 is limited.
[0033] See also Figure 1-Figure 8The outer surface of the conical heat-insulating sleeve 17 is provided with two rows of through openings 21 with rectangular cross sections from top to bottom, and the outer surface of the tube sleeve 2 is provided with two rows of rectangular holes 19 equidistantly from top to bottom. A straight tube 10 is provided outside the rectangular hole 19, and one end of the straight tube 10 is connected and fixed to the tube sleeve 2. A rectangular rod 22 is inserted in the rectangular hole 19, and one end of the rectangular rod 22 extends into the tube sleeve 2 and is connected and fixed with a block 16 with a rectangular cross section for blocking the through opening 21. The side of the block 16 facing away from the rectangular rod 22 is processed with an arc surface 28 that matches the surface of the drain pipe 1, and the end of the rectangular rod 22 away from the block 16 extends into the straight tube 10, and the end of the rectangular rod 22 in the straight tube 10 is installed with a piston 24 for dividing the internal space of the straight tube 10, and the piston 24 is slidably installed in the straight tube 10, and the piston 24 and the rectangular hole 19 are connected. A spring 23 is provided in the middle, and the spring 23 is sleeved on the rectangular rod 22. A cylinder cover 11 is installed at one end of the straight cylinder 10 away from the cylinder sleeve 2, wherein the end of the straight cylinder 10 away from the cylinder sleeve 2 is sleeved with a connecting ring 27 connected and fixed to the straight cylinder 10, and a plurality of first small holes are opened in a circular shape and equidistantly on one side of the connecting ring 27, and a plurality of second small holes aligned with the first small holes are opened in a circular shape and equidistant on one side of the cylinder cover 11, and a screw is inserted in the channel formed by the first small holes and the second small holes, and a nut is threadedly connected to one end of the screw, and the screw and the nut cooperate with each other to complete the assembly of the cylinder cover 11 and the straight cylinder 10, and a horizontal screw hole 26 is opened in the middle position of one side of the cylinder cover 11, and a screw 12 for extruding the piston 24 is threadedly connected to the horizontal screw hole 26, and a knob head 13 is connected and fixed to one end of the screw 12 on the outside of the straight cylinder 10.
[0034] The screw rod 12 is turned by the knob head 13, so that the screw rod 12 squeezes the piston 24. After the piston 24 is squeezed, the rectangular rod 22 is driven to slide along the rectangular hole 19, so that the block 16 moves into the through-port 21. At this time, the piston 24 cooperates with the sleeve 2 to squeeze the spring 23, so that the spring 23 produces elastic deformation, and the block 16 moves into the through-port 21 to block the through-port 21. Conversely, when the screw rod 12 is turned in the opposite direction, the rectangular rod 22 moves in the opposite direction along the rectangular hole 19 under the action of the rebound force of the spring 23, so that the block 16 moves out of the through-port 21. By adjusting the number of through-ports 21 blocked by the block 16, The amount of contact between the high-temperature medium discharged from the compressor and the drain pipe 1 that flows into the space formed by the sleeve 2 and the drain pipe 1 changes, that is, when the number of blocked openings 21 increases, the contact range between the high-temperature medium discharged from the compressor and the drain pipe 1 decreases, and vice versa. Since the contact range between the high-temperature medium discharged from the compressor and the drain pipe 1 changes, the temperature of the surface of the drain pipe 1 can be controlled, and the temperature of the drain pipe 1 after being heated by the high-temperature medium can be adjusted as needed, avoiding high temperatures of components such as the drain pipe 1 and the drain valve 9, preventing scalding when operating the drain valve 9, and improving safety.
[0035] See also Figure 6 and Figure 8A protective plate 25 is connected and fixed to the end of the piston 24 facing the screw rod 12. The outer diameter of the protective plate 25 is smaller than the outer diameter of the piston 24. A plurality of column heads are evenly fixed on the side of the protective plate 25 facing the piston 24. A plurality of blind holes matching the column heads are evenly opened on the side of the piston 24 facing the protective plate 25, so that the column heads are glued in the blind holes by glue, thereby improving the stability of the connection between the protective plate 25 and the piston 24. Under the action of the protective plate 25, the end of the screw rod 12 is prevented from directly contacting the piston 24, thereby protecting the piston 24. The side of the block 16 facing the rectangular rod 22 is recessed to form a first positioning hole, and the side of the piston 24 facing the rectangular rod 22 is recessed to form a second positioning hole, so that the two ends of the rectangular rod 22 are respectively fixed in the first positioning hole and the second positioning hole, thereby improving the stability of the connection between the rectangular rod 22 and the block 16 and the piston 24.
[0036] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A device for preventing freezing of a drain pipe of a hot and cold water unit, comprising a drain pipe (1), characterized in that: The upper part of the drain pipe (1) is processed with an internal thread, the lower end of the drain pipe (1) is equipped with a drain valve (9), the drain pipe (1) is sleeved with a tapered heat-insulating sleeve (17) which is narrow at the top and wide at the bottom, the tapered heat-insulating sleeve (17) is connected and fixed to the drain pipe (1), the tapered heat-insulating sleeve (17) is sleeved with a sleeve (2), the middle part of the upper surface of the sleeve (2) is provided with an upper tapered hole (18) which is narrow at the top and wide at the bottom, the middle part of the lower surface of the sleeve (2) is provided with a lower tapered hole (20) which is narrow at the top and wide at the bottom, the upper end of the tapered heat-insulating sleeve (17) passes through the upper tapered hole (18), the lower end of the tapered heat-insulating sleeve (17) passes through the lower tapered hole (20), the outer surface of the lower end of the sleeve (2) is equipped with A first straight pipe (3), wherein the end of the first straight pipe (3) away from the sleeve (2) is provided with a first stop valve (5) for connecting to the discharge end of the compressor in the hot and cold water unit, a second straight pipe (14) is provided on the outer surface of the upper end of the sleeve (2), and the end of the second straight pipe (14) away from the sleeve (2) is provided with a second stop valve (15) for connecting to the inlet end of the condenser, a stopper for limiting the relative position of the sleeve (2) and the drain pipe (1) is provided between the first straight pipe (3) and the lower end of the drain pipe (1), the outer surface of the conical heat insulating sleeve (17) is provided with two rows of openings (21) from top to bottom, and the outer surface of the sleeve (2) is provided with two rows of blocking members for blocking the openings (21) from top to bottom.
2. The antifreeze device for the drain pipe of a hot and cold water unit according to claim 1, characterized in that: The limiting member comprises a support plate (8), a support plate (8) is provided on the lower side of the conical heat insulating sleeve (17), a circular opening (29) is provided on one side of the upper surface of the support plate (8), the lower end of the drain pipe (1) passes through the circular opening (29) and the drain pipe (1) is connected and fixed to the support plate (8), a stud (7) is rotatably connected to the outer surface of the first straight pipe (3), a vertical screw hole (30) is provided on the side of the upper surface of the support plate (8) away from the circular opening (29), the lower end of the stud (7) is threadedly connected in the vertical screw hole (30), and a handle (32) is installed on the outer surface of the upper end of the stud (7).
3. The antifreeze device for the drain pipe of a hot and cold water unit according to claim 2, characterized in that: The first straight tube (3) is sleeved with a ring (4) connected and fixed to the first straight tube (3); the lower portion of the outer surface of the ring (4) is connected and fixed to a limiting sleeve (6); a through hole is provided at the middle portion of the lower surface of the limiting sleeve (6); the upper end of the stud (7) passes through the through hole and is connected and fixed to a limiting head (31); the limiting head (31) is slidably installed in the limiting sleeve (6); and the cross-sections of the limiting head (31) and the limiting sleeve (6) are both circular.
4. The antifreeze device for drain pipes of hot and cold water units according to claim 1, characterized in that: The blocking member comprises a straight tube (10), the outer surface of the tube sleeve (2) is provided with two rows of rectangular holes (19) equidistant from top to bottom, a straight tube (10) is provided outside the rectangular hole (19), one end of the straight tube (10) is connected and fixed to the tube sleeve (2), a rectangular rod (22) is inserted in the rectangular hole (19), one end of the rectangular rod (22) extends into the tube sleeve (2) and is connected and fixed to a blocking block (16) for blocking the opening (21), one end of the rectangular rod (22) away from the blocking block (16) extends into the straight tube (10), and one end of the rectangular rod (22) in the straight tube (10) is provided with a partition A piston (24) is provided in the inner space of the straight cylinder (10), the piston (24) is slidably mounted in the straight cylinder (10), a spring (23) is provided between the piston (24) and the rectangular hole (19), the spring (23) is sleeved on the rectangular rod (22), a cylinder cover (11) is provided at one end of the straight cylinder (10) away from the cylinder sleeve (2), a horizontal screw hole (26) is provided at the middle position of one side surface of the cylinder cover (11), a screw rod (12) for squeezing the piston (24) is connected to the inner thread of the horizontal screw hole (26), and a knob head (13) is connected and fixed to one end of the screw rod (12) located outside the straight cylinder (10).
5. The antifreeze device for the drain pipe of a hot and cold water unit according to claim 4, characterized in that: The end of the straight tube (10) away from the tube sleeve (2) is sleeved with a connecting ring (27) connected and fixed to the straight tube (10); a side surface of the connecting ring (27) is provided with a plurality of first small holes in a circular shape and equidistantly spaced therefrom; a side surface of the tube cover (11) is provided with a plurality of second small holes in a circular shape and equidistantly spaced therefrom and aligned with the first small holes; a screw is inserted into a channel formed by the first small holes and the second small holes, and a nut is threadedly connected to one end of the screw.
6. The antifreeze device for drain pipes of hot and cold water units according to claim 4, characterized in that: A protective plate (25) is connected and fixed to one end of the piston (24) facing the screw rod (12); the outer diameter of the protective plate (25) is smaller than the outer diameter of the piston (24); a plurality of column heads are evenly fixed to one side of the protective plate (25) facing the piston (24); a plurality of blind holes matching the column heads are evenly opened on one side of the piston (24) facing the protective plate (25); the column heads are glued into the blind holes by glue.
7. The antifreeze device for drain pipes of hot and cold water units according to claim 4, characterized in that: The cross section of the blocking block (16) is rectangular, the cross section of the through opening (21) is rectangular, and a side of the blocking block (16) facing away from the rectangular rod (22) is processed with an arc surface (28) matching the surface of the drainage pipe (1).
8. The antifreeze device for the drain pipe of a hot and cold water unit according to claim 4, characterized in that: The block (16) is recessed on one side facing the rectangular rod (22) to form a first positioning hole, the piston (24) is recessed on one side facing the rectangular rod (22) to form a second positioning hole, and the two ends of the rectangular rod (22) are respectively fixed in the first positioning hole and the second positioning hole.
9. The antifreeze device for drain pipes of hot and cold water units according to claim 1, characterized in that: The end of the first stop valve (5) away from the first straight pipe (3) is sleeved with a first flange connected and fixed to the first stop valve (5), and the end of the second stop valve (15) away from the second straight pipe (14) is sleeved with a second flange connected and fixed to the second stop valve (15).