Air source heat pump anti-freezing device

Abstract

The utility model relates to heat pump equipment technical field, concretely disclose an air source heat pump anti -freezing device, air source heat pump anti -freezing device, including heat pump pipeline, the surface of heat pump pipeline is provided with anti -freezing subassembly, and the anti -freezing subassembly includes first locating sleeve and second locating sleeve, and first locating sleeve and second locating sleeve are respectively set in the surface of heat pump pipeline, and the inboard of first locating sleeve and second locating sleeve all is provided with electric heating plate, and the inner wall of electric heating plate is in contact with heat pump pipeline. Through locating the elastic spring in the nut and push the roof and the guide block guide groove cooperation form elastic compensation structure, adjust the fastening pressure of locating screw rod automatically when thermal expansion and cold shrink, ensure that electric heating plate and pipeline sustained even contact, and the locating screw rod of multiple groups of symmetrical distribution and connecting hole enhances structural stability, has the advantage through the elastic compensation structure and maintains electric heating plate and pipeline stable contact pressure, avoids the screw thread pair loosening and promotes the heat conduction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat pump equipment technology, specifically to an air source heat pump antifreeze device. Background Technology

[0002] Air source heat pumps, as highly efficient and energy-saving heat conversion devices, use a compressor to drive refrigerant circulation, extracting heat from a low-temperature environment and releasing it to a high-temperature environment. While this technology has advantages such as low operating costs and good environmental performance, it also poses significant risks under low-temperature conditions: when the equipment experiences an unexpected power outage, the liquid refrigerant remaining in the pipes of the evaporator, shell-and-tube heat exchanger, etc., may freeze and expand, causing the pipes to rupture and resulting in permanent damage to the system.

[0003] Current antifreeze solutions generally employ electrically heated antifreeze components, fixing the heating element to the outer wall of the pipe using clamps or straps. However, this type of fixing structure has inherent drawbacks: traditional threaded fasteners are constantly subjected to alternating stresses caused by the thermal expansion and contraction of the pipe during heat pump operation, making them prone to loosening of the threaded joints; rigid fixing methods lacking elastic compensation structures can lead to uneven contact pressure between the heating plate and the pipe, and poor local contact will significantly reduce heat transfer efficiency. More seriously, a loosened antifreeze component may displace due to vibration, creating gaps between itself and the pipe, not only losing its antifreeze function but also potentially causing localized overheating risks due to poor contact.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an air source heat pump antifreeze device, which has the advantages of maintaining stable contact pressure between the electric heating plate and the pipe through an elastic compensation structure, preventing loosening of the threaded pair, and improving heat transfer efficiency.

[0006] This application provides an air source heat pump antifreeze device, the technical solution of which is as follows: The air source heat pump antifreeze device includes a heat pump pipe, and an antifreeze component is provided on the surface of the heat pump pipe. The antifreeze component includes a first positioning sleeve and a second positioning sleeve, and the first positioning sleeve and the second positioning sleeve are respectively fitted on the surface of the heat pump pipe. An electric heating plate is provided on the inner side of both the first positioning sleeve and the second positioning sleeve, and the inner wall of the electric heating plate is in contact with the heat pump pipe. Positioning screws are provided on both sides of the top of the second positioning sleeve. Connection holes adapted to the positioning screws are opened on both sides of the inner cavity of the first positioning sleeve. A gasket is fitted on the surface of the positioning screw and is located on the surface of the first positioning sleeve. A positioning screw sleeve is threadedly connected to the surface of the positioning screw. A return spring is provided on the top of the inner cavity of the positioning screw sleeve. One end of the return spring is fixedly connected to a top plate. A guide block is provided on the surface of the top plate. A guide groove adapted to the guide block is opened in the inner cavity of the positioning screw sleeve. The bottom of the top plate is in close contact with the positioning screw.

[0007] Furthermore, this application also proposes that the inner sides of the first positioning sleeve and the second positioning sleeve are fixedly connected to the two electric heating plates by adhesive, and the two electric heating plates are the same size.

[0008] Furthermore, this application also proposes that the surface of the positioning screw sleeve is fitted with an anti-slip sleeve, and the surface of the anti-slip sleeve is provided with anti-slip threads.

[0009] Furthermore, this application also proposes that the inner cavity of the positioning screw sleeve is provided with four guide grooves at equal intervals, and the surface of the top plate is provided with four guide blocks that are adapted to the guide grooves.

[0010] Furthermore, this application also proposes that three positioning screws are equally spaced on both sides of the top of the second positioning sleeve, and the six positioning screws are arranged symmetrically in pairs.

[0011] Furthermore, this application also proposes that three connecting holes adapted to the positioning screw are provided on both sides of the inner cavity of the first positioning sleeve, and the inner diameter of the connecting holes is slightly larger than the diameter of the positioning screw.

[0012] As can be seen from the above, the air source heat pump antifreeze device and its antifreeze components provided in this application use a reset spring inside the positioning screw sleeve to push the top plate and guide block guide groove to form an elastic compensation structure. During thermal expansion and contraction, the tightening pressure of the positioning screw is automatically adjusted to ensure continuous and uniform contact between the electric heating plate and the pipeline. At the same time, multiple sets of symmetrically distributed positioning screws and connecting holes enhance the structural stability. It has the advantages of maintaining stable contact pressure between the electric heating plate and the pipeline through the elastic compensation structure, avoiding loosening of the threaded pair, and improving heat transfer efficiency. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the antifreeze component structure of this utility model; Figure 3 This is a schematic diagram of the second positioning sleeve structure of this utility model; Figure 4 This is a schematic diagram of the first positioning sleeve structure of this utility model; Figure 5 This is a partial cross-sectional view of the positioning screw sleeve of this utility model.

[0014] In the diagram: 1. Heat pump pipe; 2. Antifreeze component; 201. First positioning sleeve; 202. Second positioning sleeve; 203. Electric heating plate; 204. Positioning screw sleeve; 205. Positioning screw; 206. Connecting hole; 207. Anti-slip sleeve; 208. Guide groove; 209. Return spring; 2010. Top plate; 2011. Guide block; 2012. Gasket. Detailed Implementation

[0015] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0016] Please see Figure 1-5 In existing technologies, air source heat pumps utilize high-grade energy to transfer heat from a low-grade heat source (air) to a high-grade heat source, offering energy-saving and environmental advantages. However, when the unit is powered off, residual liquid in the pipes may freeze due to low temperatures, causing the pipes to rupture. While existing antifreeze components 2 can prevent freezing through electric heating, their fixing structure lacks an anti-loosening design, resulting in a loose fit between the component and the pipes, affecting the antifreeze effect. For example, in the low-temperature environment of northern winters, traditional fasteners are prone to loosening due to thermal expansion and contraction or vibration, causing poor contact between the electric heating plate 203 and the pipes, hindering effective heat conduction.

[0017] To address the aforementioned problems, the inventors discovered that existing fixing structures relying solely on threaded locking are prone to stress relaxation and subsequent decrease in preload after prolonged use. To resolve this issue, an elastic compensation mechanism needs to be introduced into the fixing structure, allowing the locking force to automatically adjust according to changes in external conditions. Through analysis of threaded connection failure modes, a spring-loaded pressure structure is proposed within the positioning sleeve 204. This structure utilizes spring deformation to compensate for the clearance between the threaded components, maintaining a constant clamping force.

[0018] Therefore, this application proposes an air-source heat pump antifreeze device including a heat pump pipe 1, with an antifreeze component 2 installed on the surface of the heat pump pipe 1. The antifreeze component 2 includes a first positioning sleeve 201 and a second positioning sleeve 202, which are respectively fitted onto the surface of the pipe. An electric heating plate 203 is installed inside both positioning sleeves, with the inner wall of the electric heating plate 203 contacting the pipe. Positioning screws 205 are installed on both sides of the top of the second positioning sleeve 202, and connecting holes 206 adapted to the positioning screws 205 are opened on both sides of the first positioning sleeve 201. A gasket 2012 is fitted onto the surface of the positioning screw 205 and located on the surface of the first positioning sleeve 201, with a threaded connection of a positioning screw sleeve 204 to the screw surface. A return spring 209 is installed at the top of the inner cavity of the positioning screw sleeve 204, with one end of the spring fixedly connected to a top plate 2010. A guide block 2011 is installed on the surface of the top plate 2010, and a guide groove 208 adapted to the guide block 2011 is opened in the inner cavity of the positioning screw sleeve 204. The bottom of the top plate 2010 contacts the positioning screw 205.

[0019] Among them, the return spring 209 is a mechanical element used to provide axial elastic force, which can be implemented as a helical compression spring with an elastic coefficient ranging from 5-20N to adapt to different preload requirements. The mating structure of the guide block 2011 and the guide groove 208 refers to a guiding component that restricts the rotation of the top plate 2010, which can be a rectangular protrusion and groove mating to ensure that the top plate 2010 moves only axially. The positioning screw sleeve 204 is a fastener with internal threads, which can be a hexagonal nut structure, with knurling added to the outer surface to enhance manual tightening operability. The gasket 2012 is a ring-shaped component that distributes pressure, which can be made of rubber to provide a cushioning effect.

[0020] Specifically, during installation, the positioning screw 205 of the second positioning sleeve 202 is inserted into the connecting hole 206 of the first positioning sleeve 201, and the positioning sleeve 204 is rotated to move downwards along the screw. The top plate 2010 inside the positioning sleeve 204 is continuously pressed against the end of the screw by the thrust of the return spring 209, keeping the two positioning sleeves axially pressed. When the threaded pair develops a gap due to vibration, the return spring 209 pushes the top plate 2010 to move along the guide groove 208 to compensate for the gap and maintain the contact pressure between the electric heating plate 203 and the pipeline. The cooperation between the guide block 2011 and the guide groove 208 prevents the top plate 2010 from rotating with the sleeve, ensuring that the spring compression direction is always consistent with the screw axis.

[0021] Compared to existing technologies, which rely solely on threaded friction to maintain locking, this solution utilizes a spring-loaded structure to create a dynamic compensation mechanism. Traditional methods are prone to loosening under temperature changes or mechanical vibration; in this solution, the spring continuously provides axial thrust, ensuring the electric heating plate 203 maintains effective contact area with the pipe. The guide groove 208 structure prevents stress concentration caused by the deflection of the top plate 2010, extending the component's service life.

[0022] Through the above technical solutions, this application maintains stable contact between the electric heating plate 203 and the pipeline in low-temperature environments, preventing a decrease in heat transfer efficiency due to loose fasteners. The spring compensation mechanism effectively addresses dimensional changes caused by thermal expansion and contraction, ensuring the reliability of the antifreeze component 2 under long-term vibration conditions. The guide structure avoids localized wear caused by the misalignment of the top plate 2010, improving the durability of the fastening system.

[0023] This application further proposes that the inner sides of the first positioning sleeve 201 and the second positioning sleeve 202 are fixedly connected to the two electric heating plates 203 by adhesive, and the two electric heating plates 203 are the same size.

[0024] Among them, adhesive fixing connection refers to using an adhesive to bond the electric heating plate 203 to the inner surface of the positioning sleeve. Specifically, epoxy resin or high-temperature resistant silicone can be used. After curing, such materials form a stable adhesive layer that can withstand the vibration and temperature changes during pipeline operation.

[0025] Among them, "consistent size" means that the length, width and thickness of the two electric heating plates 203 are the same. This can be achieved through standardized processing technology, such as using the same mold or CNC cutting equipment to ensure that the contact area and distribution of the two with the heat pump pipe 1 are consistent.

[0026] Specifically, during installation, the electric heating plate 203 is fixed to the inner side of the first positioning sleeve 201 and the second positioning sleeve 202 using adhesive. The adhesive fills the gap between the electric heating plate 203 and the positioning sleeve, avoiding localized stress concentration caused by mechanical fixing. The two electric heating plates 203 are designed with the same size, ensuring symmetrical distribution of their contact areas with the heat pump pipe 1. This ensures uniform heat transfer during heating and avoids localized overheating or heating blind spots due to size differences. The curing effect of the adhesive further enhances the connection strength between the electric heating plate 203 and the positioning sleeve, preventing displacement under thermal expansion and contraction or vibration conditions.

[0027] Compared to existing technologies, the electric heating plate 203 in existing antifreeze components 2 is typically fixed using mechanical methods such as bolts or clips. Such structures are prone to loosening under long-term vibration or temperature changes, resulting in a loose fit between the electric heating plate 203 and the pipe. This solution, however, uses adhesive fixing combined with standardized dimensional design, which not only eliminates gaps in mechanical connections but also improves the contact stability between the electric heating plate 203 and the pipe, thereby reducing the risk of reduced antifreeze performance due to fixing failure.

[0028] Through the above technical solution, this application solves the problem of the electric heating plate 203 and the positioning sleeve not being firmly connected in the antifreeze component 2. By using adhesive fixation and dimensional consistency design, it ensures that the electric heating plate 203 can still fit tightly against the surface of the heat pump pipe 1 under complex working conditions, thereby improving the reliability of the antifreeze effect and service life.

[0029] This application further proposes that the surface of the positioning screw sleeve 204 is fitted with an anti-slip sleeve 207, and the surface of the anti-slip sleeve 207 is provided with anti-slip threads.

[0030] The anti-slip sleeve 207 refers to the annular component wrapped around the outer surface of the positioning screw sleeve 204, which can be made of rubber or silicone material to increase friction during operation. The anti-slip thread refers to the continuous raised texture formed on the surface of the anti-slip sleeve 207, which can be achieved through a molding process to enhance the anti-slip effect when rotating by hand.

[0031] Specifically, the anti-slip sleeve 207 is fitted onto the outer circumferential surface of the positioning screw sleeve 204, and its surface has anti-slip threads forming a concave-convex contact surface. When the operator tightens the positioning screw sleeve 204, the anti-slip threads generate frictional resistance in contact with the palm, preventing slippage due to sweaty or oily hands. The elastic material of the anti-slip sleeve 207 deforms under pressure, increasing the contact area with the palm, while the threaded structure creates directional resistance, ensuring that the rotational torque is effectively transmitted to the positioning screw sleeve 204.

[0032] Compared to existing technologies, traditional fastening devices typically use smooth metal surfaces, which are prone to slippage in humid environments, leading to insecure fastening. This solution adds an elastic sleeve with anti-slip threads to the outside of the positioning screw sleeve 204, which retains the mechanical strength of the threaded connection and improves operational reliability through surface modification, thus solving the problem of insufficient preload caused by slippage during manual tightening.

[0033] Through the above technical solution, this application effectively prevents hand slippage during tightening operations, ensuring that the positioning sleeve 204 can be fully tightened to the predetermined torque. The cooperation between the anti-slip sleeve 207 and the anti-slip thread improves the stability of the fixing structure, avoiding poor contact between the electric heating plate 203 and the pipeline due to operational errors, thereby ensuring that the antifreeze component 2 maintains a tight fit for a long time.

[0034] This application further proposes that the inner cavity of the positioning screw sleeve 204 is provided with four guide grooves 208 at equal intervals, and the surface of the top plate 2010 is provided with four guide blocks 2011 that are adapted to the guide grooves 208.

[0035] The guide groove 208 refers to the longitudinal groove structure machined on the inner wall of the positioning screw sleeve 204, which can be achieved by milling or stamping processes, and is used to limit the movement trajectory of the guide block 2011. The guide block 2011 refers to the protruding structure fixed on the surface of the top plate 2010, which can be achieved by welding or casting processes. Its shape forms a clearance fit with the guide groove 208, and is used to prevent the top plate 2010 from rotating or shifting under the action of the return spring 209.

[0036] Specifically, when the positioning sleeve 204 is tightened, the guide block 2011 at the bottom of the top plate 2010 moves downward along the straight trajectory of the guide groove 208, and the return spring 209 is compressed, generating a reverse force. The cooperation between the four guide grooves 208 and the guide block 2011 ensures that the top plate 2010 remains vertical during movement, preventing misalignment of the contact surface between the positioning screw 205 and the top plate 2010 due to rotational friction. Thus, the thread engagement force between the positioning sleeve 204 and the positioning screw 205 is evenly distributed, preventing thread stripping or loosening due to localized stress concentration.

[0037] Compared with existing technologies, the positioning sleeve 204 of the conventional antifreeze component 2 lacks a guiding structure. During tightening, the top plate 2010 is easily tilted due to the spring reaction force, resulting in uneven force at the threaded connection. This solution, by setting four equidistant guide grooves 208 and guide blocks 2011, enables the top plate 2010 to form a stable four-way limit during axial movement, effectively eliminating rotational degrees of freedom and improving the reliability of the threaded connection.

[0038] Through the above technical solution, this application solves the problem of loosening of the antifreeze component 2 fastener caused by uneven force, so that the threaded engagement surfaces of the positioning screw sleeve 204 and the positioning screw 205 always maintain uniform contact pressure, avoid connection failure caused by vibration or temperature change, and ensure the bonding stability of the electric heating plate 203 and the heat pump pipe 1.

[0039] This application further proposes that three positioning screws 205 are equally spaced on both sides of the top of the second positioning sleeve 202, and the six positioning screws 205 are arranged symmetrically in pairs.

[0040] The equidistant setting refers to the three positioning screws 205 being evenly distributed on one side of the top of the second positioning sleeve 202. Specifically, this can be achieved by machining threaded holes with a fixed spacing to ensure the uniformity of force on each positioning screw 205.

[0041] The symmetrical arrangement means that the positioning screws 205 on both sides are mirror-symmetrically distributed on the top of the second positioning sleeve 202. This can be achieved through positioning and machining along the axis of symmetry. This is used to balance the fastening forces on both sides and avoid component displacement due to uneven force.

[0042] Specifically, three positioning screws 205 are respectively set on both sides of the top of the second positioning sleeve 202, and the number and position of the positioning screws 205 on both sides are symmetrically matched. When the first positioning sleeve 201 and the second positioning sleeve 202 are connected by the positioning screws 205, the multi-point fixing structure formed by the six positioning screws 205 can cover a wider contact area. By applying uniform pressure through the symmetrically distributed positioning screws 205, the inner electric heating plates 203 of the first positioning sleeve 201 and the second positioning sleeve 202 are tightly attached to the surface of the heat pump pipe 1, reducing the risk of loosening due to insufficient local pressure.

[0043] Compared to existing technologies, current antifreeze components 2 typically employ a single row or asymmetrically distributed positioning screws 205, resulting in concentrated fastening force in localized areas, which can easily lead to gaps due to thermal expansion and contraction or vibration. This solution, however, uses six symmetrically distributed positioning screws 205 to create multi-directional constraints, enhancing the overall stability of the component while dispersing fastening pressure and preventing single-point overload.

[0044] Through the above technical solution, this application solves the problem of loose fit of the antifreeze component 2 due to loose fasteners. By fixing the component at multiple points symmetrically, the contact reliability between the component and the heat pump pipe 1 is improved, ensuring that the electric heating plate 203 can continuously and effectively transfer heat and prevent the pipe from freezing and cracking.

[0045] This application further proposes that three connecting holes 206 adapted to the positioning screw 205 are provided on both sides of the inner cavity of the first positioning sleeve 201. The inner diameter of the connecting hole 206 is slightly larger than the diameter of the positioning screw 205.

[0046] The connecting hole 206 refers to the through structure set inside the positioning sleeve to accommodate the positioning screw 205. Specifically, it can be achieved by machining three circular through holes symmetrically opened on both sides of the positioning sleeve, thereby enhancing the stability of the component through multi-point fixing.

[0047] The inner diameter being slightly larger than the diameter of the positioning screw 205 refers to the existence of a small gap between the connecting hole 206 and the screw. This can be achieved through tolerance fit design, such as controlling the hole diameter within the range of 1.05-1.1 times the screw diameter, which ensures both smooth assembly and tight contact.

[0048] Specifically, the three connecting holes 206 are equidistantly distributed on both sides of the first positioning sleeve 201, corresponding one-to-one with the three positioning screws 205 on the second positioning sleeve 202. During installation, the positioning screws 205 pass through the connecting holes 206 and are secured by the washers 2012 and the positioning sleeves 204. The increase in the number of connecting holes 206 to three allows for multi-level fixed support, effectively dispersing the stress generated by pipeline vibration. The slightly larger inner diameter of the connecting holes 206 allows for a small displacement space within the holes, avoiding rigid compression caused by thermal expansion and contraction or assembly errors. Simultaneously, the elastic pressure applied by the positioning sleeves 204 maintains the stability of the fixed structure.

[0049] Compared to existing technologies, traditional antifreeze components 2 typically use a single connection hole 206 to engage with a screw, which is prone to displacement and loosening under long-term vibration. This solution uses three connection holes 206 to form a triangular fixing layout, combined with an elastic clamping structure, to ensure that the antifreeze component 2 maintains uniform contact pressure with the pipe surface at all times, significantly reducing the risk of decreased antifreeze performance due to fixing failure.

[0050] Through the above technical solution, this application solves the technical problem that the antifreeze component 2 is easy to loosen after installation, resulting in poor fit. By increasing the number of connection holes 206 to optimize the fixed support structure and combining the gap fit design to eliminate assembly stress, it ensures that the electric heating plate 203 has continuous and effective contact with the pipe surface, thereby improving the antifreeze effect and extending the service life of the equipment.

[0051] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An air-source heat pump antifreeze device, comprising a heat pump pipe (1), characterized in that: The surface of the heat pump pipe (1) is provided with an antifreeze component (2). The antifreeze component (2) includes a first positioning sleeve (201) and a second positioning sleeve (202). The first positioning sleeve (201) and the second positioning sleeve (202) are respectively fitted onto the surface of the heat pump pipe (1). An electric heating plate (203) is provided on the inner side of both the first positioning sleeve (201) and the second positioning sleeve (202). The inner wall of the electric heating plate (203) is in contact with the heat pump pipe (1). Positioning screws (205) are provided on both sides of the top of the second positioning sleeve (202). Connection holes (206) adapted to the positioning screws (205) are opened on both sides of the inner cavity of the first positioning sleeve (201). The positioning screw (205) is fitted with a washer (2012), and the washer (2012) is located on the surface of the first positioning sleeve (201). The positioning screw (205) is threadedly connected to a positioning sleeve (204). A return spring (209) is provided at the top of the inner cavity of the positioning sleeve (204). One end of the return spring (209) is fixedly connected to a top plate (2010). A guide block (2011) is provided on the surface of the top plate (2010). A guide groove (208) adapted to the guide block (2011) is opened in the inner cavity of the positioning sleeve (204). The bottom of the top plate (2010) is in close contact with the positioning screw (205).

2. The air source heat pump antifreeze device according to claim 1, characterized in that: The inner sides of the first positioning sleeve (201) and the second positioning sleeve (202) are fixedly connected to the two electric heating plates (203) by adhesive, and the two electric heating plates (203) are the same size.

3. The air source heat pump antifreeze device according to claim 1, characterized in that: The surface of the positioning screw sleeve (204) is fitted with an anti-slip sleeve (207), and the surface of the anti-slip sleeve (207) is provided with anti-slip threads.

4. The air source heat pump antifreeze device according to claim 1, characterized in that: The inner cavity of the positioning screw sleeve (204) is provided with four guide grooves (208) at equal intervals, and the surface of the top plate (2010) is provided with four guide blocks (2011) that are compatible with the guide grooves (208).

5. The air source heat pump antifreeze device according to claim 1, characterized in that: The second positioning sleeve (202) has three positioning screws (205) evenly spaced on both sides of its top, and the six positioning screws (205) are arranged symmetrically in pairs.

6. The air source heat pump antifreeze device according to claim 1, characterized in that: The first positioning sleeve (201) has three connecting holes (206) on both sides of its inner cavity that are adapted to the positioning screw (205), and the inner diameter of the connecting holes (206) is slightly larger than the diameter of the positioning screw (205).

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