Air source heat pump finned tube evaporator with frosting measuring structure

Abstract

The utility model discloses an air source heat pump finned tube evaporator with a frosting measuring structure, and relates to the technical field of air source heat pump finned tube evaporators. Comprising a first installation plate, the first installation plate is provided with an installation mechanism used for an air source heat pump finned tube evaporator with a frosting measuring structure, the installation mechanism comprises a splicing assembly, a check block is compressed in a cavity groove under the action of a spring and a telescopic sleeve rod and then penetrates through a locking hole to conduct blocking, and therefore the air source heat pump finned tube evaporator with the frosting measuring structure is prevented from being damaged. A nut on a threaded rod is rotated to extrude a first locking block and a second locking block, combined installation of the first fin and the second fin is achieved, the coil pipe is clamped through an installation groove in the inner wall of the second fin and is extruded and fixed by the first fin, and the coil pipe is installed. And all the components are relatively independent, and independent maintenance and replacement can be conveniently carried out when needed.

Description

Technical Field

[0001] The utility model relates to the technical field of air source heat pump finned tube evaporators, and specifically relates to an air source heat pump finned tube evaporator with a frosting measurement structure. Background Technique

[0002] The reference patent (publication number: CN118376037A; publication date: July 23, 2024) discloses a defrosting control system based on a frosting thickness model prediction, including: a data acquisition system including a temperature sensor, a CMOS camera, a temperature and humidity sensor, a wind speed sensor, and a differential pressure sensor; a frosting prediction model for predicting the dynamic change of the frost layer on the surface of the finned tube heat exchanger in the cold storage during operation. The input parameters of the frosting prediction model are the return air temperature and humidity of the fan, the supply air temperature and humidity of the fan, the surface temperature of the finned tube, the differential pressure at the inlet and outlet of the finned tube, and the air velocity at the inlet and outlet of the finned tube, and the output parameters are the frost layer thickness, frost layer density, and dynamic thermal efficiency of the heat exchanger at each moment.

[0003] The design of traditional finned tube evaporators often adopts an overall welding or fastening connection method to fix the finned tube and components such as headers together. However, when the finned tube is fouled, blocked, or damaged due to long-term use and needs to be replaced or cleaned, due to the overall structure design, the fins cannot be disassembled, which is not convenient for replacement and maintenance when damaged, and it is not convenient to position the fins during installation, resulting in deviation during installation. Therefore, the utility model provides an air source heat pump finned tube evaporator with a frosting measurement structure. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides an air source heat pump finned tube evaporator with a frosting measurement structure, which solves the problems that the design of traditional finned tube evaporators often adopts an overall welding or fastening connection method to fix the finned tube and components such as headers together. However, when the finned tube is fouled, blocked, or damaged due to long-term use and needs to be replaced or cleaned, due to the overall structure design, the fins cannot be disassembled, which is not convenient for replacement and maintenance when damaged, and it is not convenient to position the fins during installation, resulting in deviation during installation.

[0005] To achieve the above objectives, the utility model is realized through the following technical solutions: an air source heat pump finned tube evaporator with a frosting measurement structure, including a first mounting plate, and an installation mechanism for the air source heat pump finned tube evaporator with a frosting measurement structure is arranged on the first mounting plate. The installation mechanism includes:

[0006] The splicing component includes a first fin fixedly connected to the lower end of the first mounting plate. A second mounting plate is arranged inside the first mounting plate and is connected by a positioning component. A second locking block is arranged at the upper end of the first mounting plate, and a first locking block is arranged inside the second locking block and is connected by a locking component.

[0007] The measuring component includes a second fin fixedly connected to the lower end of the second mounting plate. An installation groove is formed inside the second fin, and a coil pipe is arranged inside the installation groove. A paste layer is arranged at the turning point of the coil pipe, and a first thermocouple is arranged on the outer wall of the paste layer. A copper pipe is fixedly connected inside the coil pipe, and a second thermocouple is attached to the inner wall of the front end of the copper pipe.

[0008] Preferably, the positioning component includes positioning holes evenly formed in the inner wall of the first mounting plate. A positioning rod is engaged and connected inside the positioning holes, and the second mounting plate is fixedly connected to the end of the positioning rod.

[0009] Preferably, the locking component includes a locking bolt fixedly connected inside the second locking block. The first locking block is fixedly connected to the upper end surface of the second mounting plate. The right end of the locking bolt is connected to a threaded rod, and a nut is connected to the outer wall of the threaded rod. A locking hole is formed inside the first locking block.

[0010] Preferably, a cavity groove is formed inside the locking bolt. A spring is fixedly connected to the inner wall of the cavity groove. A stop block is arranged at the end of the spring, and a telescopic sleeve rod is arranged inside the inner ring of the spring. The two ends of the telescopic sleeve rod are respectively fixedly connected to the stop block and the cavity groove.

[0011] Preferably, heat insulation cotton is arranged on the outer wall of the copper pipe outside the second thermocouple, and a tie strap is arranged on the outer wall of the heat insulation cotton.

[0012] Preferably, an installation seat for fixing the coil pipe is arranged at the right end of the coil pipe.

[0013] Beneficial effects

[0014] The utility model provides an air source heat pump finned tube evaporator with a frosting measurement structure. Compared with the prior art, the following beneficial effects are achieved:

[0015] First, the first fin provided by the utility model is engaged and positioned through the positioning holes on the inner wall of the first mounting plate and the positioning rods on the inner wall of the second mounting plate, realizing the stability of the fitting connection between the first fin and the second fin and avoiding deviation. Then, the locking bolts on the inner wall of the second locking block at the upper end of the first mounting plate are inserted into the locking holes inside the first locking block. Then, the triangular-shaped stopper is squeezed, and the stopper is compressed inside the cavity groove through the action of the spring and the telescopic sleeve rod, and then passes through the locking hole to block. Rotate the nut on the threaded rod to mutually squeeze the first locking block and the second locking block, realizing the combined installation between the first fin and the second fin. Moreover, the coil pipe is engaged through the installation groove on the inner wall of the second fin and is fixed by the extrusion of the first fin for the installation of the coil pipe. Through the combined installation, each component is relatively independent, facilitating separate maintenance and replacement when needed.

[0016] Second, a first thermocouple is pasted on the inner side of the pipe at the inlet and the turning position of each coil pipe to measure the wall surface temperature. Then, the average value of the refrigerant temperatures measured by the second thermocouples at three positions above and below the copper pipe of the coil pipe is taken to calculate the convective heat transfer coefficient of the refrigerant. And a thermocouple is arranged at the turning position on the side of the embedded copper pipe of the coil pipe. The convective heat transfer coefficient of the refrigerant is obtained through the average value of the temperatures of the thermocouples at three positions above and below the embedded copper pipe. The average value of the thermocouple temperatures at the inlet and the turning position is the wall temperature. Then, the difference between the refrigerant temperature and the wall temperature * the convective heat transfer coefficient * the inner area of the pipe can obtain the heat transfer amount of a single pipe pass. The heat transfer amount of a single pipe pass is evenly divided into several micro-element segments according to the length to obtain the instantaneous heat transfer amount of the micro-element segment. The measuring tool for the heat transfer amount of a single pipe pass of the finned tube evaporator has a simple structure, is convenient to install and has a low cost. The change of the frost thickness and the frost density can be predicted through the change of the heat transfer amount during the frosting process of the finned tube heat exchanger. Brief Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the utility model;

[0018] Figure 2 is the sectional structural schematic diagram of the second fin of the utility model;

[0019] Figure 3 is the connection structural schematic diagram of the first locking block and the second locking block of the utility model;

[0020] Figure 4 is the structural schematic diagram of the coil pipe of the utility model.

[0021] In the figure: 1. First mounting plate; 101. Positioning hole; 2. First fin; 3. Second mounting plate; 301. Positioning rod; 302. Second fin; 303. Mounting groove; 304. Coiled pipe; 4. Mounting seat; 5. First locking block; 501. Locking hole; 6. Second locking block; 601. Locking bolt; 602. Threaded rod; 603. Nut; 7. Cavity groove; 701. Spring; 702. Telescopic sleeve rod; 703. Stopper; 8. Adhesive layer; 801. First thermocouple; 9. Copper pipe; 901. Second thermocouple; 902. Thermal insulation cotton; 903. Cable tie. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-4 , the present invention provides a technical solution: an air source heat pump finned tube evaporator with a frosting measurement structure, including a first mounting plate 1, and an installation mechanism for the air source heat pump finned tube evaporator with a frosting measurement structure is arranged on the first mounting plate 1. The installation mechanism includes:

[0024] The splicing assembly includes a first fin 2 fixedly connected to the lower end of the first mounting plate 1, a second mounting plate 3 connected through a positioning component is arranged inside the first mounting plate 1, a second locking block 6 is arranged at the upper end of the first mounting plate 1, and a first locking block 5 connected through a locking component is arranged inside the second locking block 6;

[0025] The measurement component includes a second mounting plate 3 with a second fin 302 fixedly connected to the lower end. An installation groove 303 is formed inside the second fin 302. A coiled pipe 304 is arranged inside the installation groove 303. A paste layer 8 is provided at the turning point of the coiled pipe 304. A first thermocouple 801 is arranged on the outer wall of the paste layer 8. Three copper pipes 9 are fixedly connected inside the coiled pipe 304. A second thermocouple 901 is attached to the inner wall of the front end of the copper pipe 9. A first thermocouple 801 is pasted on the inner side of the turning point of one side of the coiled pipe 304 where the copper pipe 9 is embedded to measure the wall surface temperature. Then, the average value of the refrigerant temperatures measured by the second thermocouple 901 at three positions above and below the coiled pipe 304 in the copper pipe 9 is taken to calculate the convective heat transfer coefficient of the refrigerant. And a thermocouple is provided at each turning point of the coiled pipe 304. The measured wall surface temperature can be used to calculate the heat transfer amount of a single branch and a single tube pass of the finned tube heat exchanger. The heat transfer amount of a single tube pass is evenly divided into several micro-element segments according to the length, and the instantaneous heat transfer amount of the micro-element segment can be obtained. All thermocouples are connected to a data acquisition device to transmit the data to the model for calculation. The specific measurement method is as follows: First, input the structural parameters of the finned tube evaporator and the experimental conditions, input the instantaneous heat transfer amount of the micro-element segment obtained in the above steps, assign initial values to the frost thickness and frost density, calculate the convective heat transfer coefficient of the refrigerant inside the tube and the wall surface temperature, assume the frost surface temperature, calculate the convective heat transfer coefficient on the air side, the heat transfer area outside the tube and the state values on the air outlet side, and the mass flow rate of water vapor, calculate the frost surface temperature, and then take the difference between the assumed value and the calculated value of the frost surface temperature. If the absolute value ≤ 0.005, calculate the growth amount of the frost thickness and frost density at the current time step for updating the frost thickness and frost density at the next time step; if the absolute value > 0.005, re-assume the frost surface temperature, re-calculate the convective heat transfer coefficient on the air side, the heat transfer area outside the tube and the state values on the air outlet side, and the mass flow rate of water vapor, and then take the difference with the calculated value of the frost surface temperature until the absolute value ≤ 0.005 is satisfied. Finally, calculate the growth amount of the frost thickness and frost density at the current time step for updating the frost thickness and frost density at the next time step. When all the set time steps are completed, output the frost thickness and frost density at each time step. If the calculation is not completed, return to continue the calculation until it is completed. The measurement tool for the heat transfer amount of a single tube pass of the finned tube evaporator has a simple structure, is convenient to install and has a low cost. The changes in the frost thickness and frost density are predicted through the changes in the heat transfer amount during the frosting process of the finned tube heat exchanger.

[0026] The single tube pass is evenly divided into several micro-element segments according to the length. The length and the time step can be arbitrarily selected, which belongs to the prior art.

[0027] In a preferred embodiment, the positioning component includes positioning holes 101 uniformly formed on the inner wall of the first mounting plate 1. A positioning rod 301 is snap-fitted inside the positioning hole 101. The second mounting plate 3 is fixedly connected to the end of the positioning rod 301. The provided first fin 2 is snap-fitted and positioned with the positioning rod 301 on the inner wall of the second mounting plate 3 through the positioning hole 101 on the inner wall of the first mounting plate 1, achieving the stability of the fitting connection between the first fin 2 and the second fin 302 and avoiding deviation.

[0028] In a preferred embodiment, the locking component includes a locking bolt 601 fixedly connected inside the second locking block 6. The first locking block 5 is fixedly connected to the upper end face of the second mounting plate 3. The right end of the locking bolt 601 is connected to a threaded rod 602. A nut 603 is connected to the outer wall of the threaded rod 602. A locking hole 501 is formed inside the first locking block 5.

[0029] In a preferred embodiment, a cavity groove 7 is formed inside the locking bolt 601. A spring 701 is fixedly connected to the inner wall of the cavity groove 7. A stop block 703 is arranged at the end of the spring 701. A telescopic sleeve rod 702 is arranged inside the inner ring of the spring 701. The two ends of the telescopic sleeve rod 702 are respectively fixedly connected to the stop block 703 and the cavity groove 7. The locking bolt 601 on the inner wall of the second locking block 6 at the upper end of the first mounting plate 1 is inserted into the locking hole 501 inside the first locking block 5. Then, the triangular stop block 703 is squeezed. The stop block 703 is compressed inside the cavity groove 7 under the action of the spring 701 and the telescopic sleeve rod 702, and then passes through the locking hole 501 to block. The nut 603 on the threaded rod 602 is rotated to mutually squeeze the first locking block 5 and the second locking block 6, realizing the combined installation between the first fin 2 and the second fin 302. Moreover, the coil 304 is snap-fitted through the installation groove 303 on the inner wall of the second fin 302 and is fixed by the extrusion of the first fin 2 for the installation of the coil 304. Through the combined installation, each component is relatively independent, facilitating separate maintenance and replacement when needed.

[0030] In a preferred embodiment, a heat-insulating cotton 902 is arranged on the outer wall of the copper tube 9 on the outer side of the second thermocouple 901. A cable tie 903 is arranged on the outer wall of the heat-insulating cotton 902. It is fixed by externally connecting the heat-insulating cotton 902 and the cable tie 903 to reduce the temperature measurement error. An installation seat 4 for fixing the coil 304 is arranged at the right end of the coil 304. It should be added that the thermocouple arranged at the turning of the coil 304 can also be provided with heat-insulating cotton and cable ties.

[0031] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0032] During operation, the set first fin 2 is engaged and positioned through the positioning hole 101 on the inner wall of the first mounting plate 1 and the positioning rod 301 on the inner wall of the second mounting plate 3, achieving the stability of the fitting connection between the first fin 2 and the second fin 302 and avoiding deviation. Then, the locking bolt 601 on the inner wall of the second locking block 6 at the upper end of the first mounting plate 1 is inserted into the locking hole 501 inside the first locking block 5. Then, the triangular-shaped stopper 703 is squeezed. The stopper 703 is compressed inside the cavity groove 7 under the action of the spring 701 and the telescopic sleeve rod 702, and then passes through the locking hole 501 for blocking. The nut 603 on the threaded rod 602 is rotated to mutually squeeze between the first locking block 5 and the second locking block 6, realizing the combined installation between the first fin 2 and the second fin 302. Moreover, the coil pipe 304 is engaged through the installation groove 303 on the inner wall of the second fin 302 and is fixed under the extrusion of the first fin 2 for the installation of the coil pipe 304. Through the combined installation, each component is relatively independent, facilitating individual maintenance and replacement when needed;

[0033] When making the measurement, a first thermocouple 801 is pasted on the inner side of the pipe at the inlet and the turning point of each coil pipe to measure the wall surface temperature. Then, the average value of the refrigerant temperatures measured by the second thermocouple 901 at three positions above and below the coil pipe 304 of the copper pipe 9 is taken to calculate the convective heat transfer coefficient of the refrigerant. Moreover, for the thermocouple arranged on one side of the copper pipe 9 embedded in each coil pipe 304, the measured wall surface temperature can be used to calculate the heat transfer amount of a single branch and a single tube pass of the finned tube heat exchanger. The heat transfer amount of a single tube pass is evenly divided into several micro-element segments according to the length, and the instantaneous heat transfer amount of the micro-element segment can be obtained. The specific measurement method is as follows: First, input the structural parameters of the finned tube evaporator and the experimental conditions, input the instantaneous heat transfer amount of the micro-element segment obtained in the above steps, assign initial values to the frost thickness and frost density, calculate the convective heat transfer coefficient of the refrigerant inside the tube and the wall surface temperature, assume the frost surface temperature, calculate the convective heat transfer coefficient on the air side, the heat transfer area outside the tube, the state values on the air outlet side, and the mass flow rate of water vapor, calculate the frost surface temperature, and then take the difference between the assumed value and the calculated value of the frost surface temperature. If the absolute value ≤ 0.005, then calculate the growth amount of the frost thickness and frost density at the current time step for updating the frost thickness and frost density at the next time step; if the absolute value > 0.005, then re-assume the frost surface temperature, re-calculate the convective heat transfer coefficient on the air side, the heat transfer area outside the tube, the state values on the air outlet side, and the mass flow rate of water vapor, and then take the difference with the calculated value of the frost surface temperature until the absolute value ≤ 0.005 is satisfied. Finally, calculate the growth amount of the frost thickness and frost density at the current time step for updating the frost thickness and frost density at the next time step. When all the set time steps are completed, output the frost thickness and frost density at each time step. If the calculation is not completed, then return to continue the calculation until it is completed. The measuring tool for the heat transfer amount of a single tube pass of the finned tube evaporator has a simple structure, is convenient to install, and has a relatively low cost. The changes in the frost thickness and frost density are predicted through the changes in the heat transfer amount during the frosting process of the finned tube heat exchanger.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air source heat pump finned tube evaporator with a frosting measurement structure, comprising a first mounting plate (1), characterized in that: An installation mechanism for an air source heat pump finned tube evaporator with a frosting measurement structure is provided on the first mounting plate (1). The installation mechanism includes: A splicing component, which includes a first fin (2) fixedly connected to the lower end of the first mounting plate (1). A second mounting plate (3) is arranged inside the first mounting plate (1) and connected through a positioning component. A second locking block (6) is arranged at the upper end of the first mounting plate (1), and a first locking block (5) is arranged inside the second locking block (6) and connected through a locking component; A measurement component, which includes a second fin (302) fixedly connected to the lower end of the second mounting plate (3). An installation groove (303) is opened inside the second fin (302). A coil pipe (304) is arranged inside the installation groove (303). A paste layer (8) is arranged at the turning point of the coil pipe (304). A first thermocouple (801) is arranged on the outer wall of the paste layer (8). A copper pipe (9) is fixedly connected inside the coil pipe (304). A second thermocouple (901) is fitted and connected to the inner wall of the front end of the copper pipe (9).

2. The finned tube evaporator of an air source heat pump with a frosting measurement structure according to claim 1, characterized in that: The positioning component includes positioning holes (101) uniformly opened on the inner wall of the first mounting plate (1). A positioning rod (301) is engaged and connected inside the positioning holes (101). The second mounting plate (3) is fixedly connected to the end of the positioning rod (301).

3. The finned tube evaporator of an air source heat pump with a frosting measurement structure according to claim 1, characterized in that: The locking component includes a locking bolt (601) fixedly connected inside the second locking block (6). The first locking block (5) is fixedly connected to the upper end face of the second mounting plate (3). The right end of the locking bolt (601) is connected to a threaded rod (602). A nut (603) is connected to the outer wall of the threaded rod (602). A locking hole (501) is opened inside the first locking block (5).

4. The finned tube evaporator of an air source heat pump with a frosting measurement structure according to claim 3, characterized in that: A cavity groove (7) is opened inside the locking bolt (601). A spring (701) is fixedly connected to the inner wall of the cavity groove (7). A stop block (703) is arranged at the end of the spring (701). A telescopic sleeve rod (702) is arranged inside the inner circle of the spring (701). The two ends of the telescopic sleeve rod (702) are respectively fixedly connected to the stop block (703) and the cavity groove (7).

5. The finned tube evaporator of an air source heat pump with a frosting measurement structure according to claim 1, characterized in that: A heat preservation cotton (902) is arranged on the outer wall of the copper pipe (9) outside the second thermocouple (901). A tie strap (903) is arranged on the outer wall of the heat preservation cotton (902).

6. The finned tube evaporator of an air source heat pump with a frosting measurement structure according to claim 1, wherein: An installation seat (4) for fixing the coil pipe (304) is arranged at the right end of the coil pipe (304).

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