CN221238018U - Ultrasonic defrosting and detecting integrated air source heat pump evaporator - Google Patents

Abstract

The utility model is an air source heat pump evaporator with integrated ultrasonic frost measurement and defrosting, comprising a shell, heat exchange tubes, a frequency conversion generator, an ultrasonic transducer, an ultrasonic transmitter, an ultrasonic receiver, an horn, a vibration plate and a metal flexible porous fin; the heat exchange tubes are located in the shell, a plurality of metal flexible porous fins are arranged on the heat exchange tubes, and the vibration plate is horizontally installed on the heat exchange tubes and connected with each metal flexible porous fin; the frequency conversion generator is electrically connected to the ultrasonic transducer, the output end of the ultrasonic transducer is connected to one end of the horn, and the other end of the horn is in close contact with the vibration plate; the ultrasonic transmitter and the ultrasonic receiver are located on the shell, and the ultrasonic transmitter is electrically connected to the ultrasonic transducer. The evaporator monitors the thickness of the frost layer and vibrates the heat exchange tubes and the metal flexible porous fins through ultrasonic waves, so that the air source heat pump evaporator can realize frost measurement and defrosting through a set of systems on the basis of having a heat exchange function, and the defrosting is more thorough, avoiding secondary frosting.

Description

An air source heat pump evaporator with integrated ultrasonic frost detection and defrosting

Technical Field

The utility model relates to the field of evaporator defrosting, in particular to an air source heat pump evaporator with integrated ultrasonic frost detection and defrosting.

Background technique

Air source heat pumps use ambient air as a low-level heat source for heating, have a high energy efficiency coefficient, and have received widespread attention and use. The evaporator of an air source heat pump needs to absorb heat from the outside when working. In a low temperature and high humidity environment, the evaporator is prone to frost, which in turn affects the energy efficiency performance of the unit.

At present, the defrosting technology for air source heat pump evaporators mainly has the following problems: 1. Frost measurement methods mainly include frost measurement based on image processing, infrared frost measurement and refrigerant superheat control method, and defrosting methods mainly include reverse cycle defrosting, electric heating defrosting, hot gas bypass defrosting and ultrasonic defrosting. Therefore, two sets of devices are generally used to complete frost measurement and defrosting work, which has high equipment cost, large volume and inconvenient installation. 2. During ultrasonic defrosting, the vibration amplitude of the evaporator heat exchange pipe is low, the frost cannot be completely removed, and the frost that is shaken off is easy to remain on the pipes and fins, causing secondary frost.

To this end, the utility model proposes an air source heat pump evaporator with integrated ultrasonic frost detection and defrosting, which combines the frost detection and defrosting structures and arranges them on the evaporator. This enables the air source heat pump evaporator to have frost detection and defrosting functions on the basis of heat exchange functions, effectively solving the problems of incomplete defrosting and secondary frost formation.

Utility Model Content

In view of the deficiencies in the prior art, the technical problem that the utility model intends to solve is to provide an air source heat pump evaporator with integrated ultrasonic frost detection and defrosting.

The technical solution adopted by the utility model to solve the technical problem is:

An air source heat pump evaporator with integrated ultrasonic frost detection and defrosting, comprising a shell and heat exchange tubes located in the shell; characterized in that the evaporator also includes a frequency conversion generator, an ultrasonic transducer, an ultrasonic transmitter, an ultrasonic receiver, a horn, a vibration transmission plate and a metal flexible porous fin;

A number of metal flexible porous fins are arranged on the heat exchange tubes, and a vibration transmission plate is horizontally installed on the heat exchange tubes and connected to each metal flexible porous fin; the frequency generator is electrically connected to the ultrasonic transducer, the output end of the ultrasonic transducer is connected to one end of the horn, and the other end of the horn is in close contact with the vibration transmission plate; the ultrasonic transmitter and the ultrasonic receiver are located on the shell, and the ultrasonic transmitter is electrically connected to the ultrasonic transducer.

Furthermore, the evaporator also includes a fan, which is installed on the shell and directly faces the heat exchange tubes and the metal flexible porous fins.

Furthermore, the metal flexible porous fin is made of aluminum fiber and has a thickness of 0.2 to 0.5 mm.

Compared with the prior art, the beneficial effects of the utility model are:

1. The utility model uses an ultrasonic transmitter and an ultrasonic receiver to monitor the thickness of the frost layer using the ultrasonic ranging principle, converts electrical energy into mechanical energy through an ultrasonic transducer to generate ultrasonic waves, and the amplitude transformer further amplifies the vibration amplitude of the ultrasonic waves. The vibration is transmitted to the heat exchange tubes and the metal flexible porous fins through the vibration plate, and finally drives the heat exchange tubes and the metal flexible porous fins to vibrate, so that the air source heat pump evaporator can measure frost and defrost through a set of systems on the basis of having the heat exchange function, solves the problems of the existing evaporator using timed defrosting, such as frost not being removed and frost being removed even when there is no frost, and can defrost more timely and efficiently; the traditional aluminum fins are replaced by metal flexible porous fins, which are easier to vibrate and the porous structure makes it easier for frost to fall off.

2. The fan can increase the air flow rate and improve the heat exchange capacity of the evaporator while blowing off the residual frost on the heat exchange tubes and metal flexible porous fins, solving the problem of incomplete ultrasonic defrosting and avoiding the accumulation of residual frost on the heat exchange tubes and metal flexible porous fins to cause secondary frost.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the overall structure;

FIG2 is a schematic diagram of the overall structure after removing the outer shell;

FIG3 is a schematic diagram of the connection between the ultrasonic transducer and the horn;

Fig. 4 is a cross-sectional view of the metal flexible porous fin in Fig. 1 along the B-B direction;

Fig. 5 is a cross-sectional view of the metal flexible porous fin in Fig. 1 along the A-A direction;

FIG6 is a state diagram of the metal flexible porous fin during vibration;

Figure 7 is a control block diagram;

In the figure, 1. frequency conversion generator; 2. ultrasonic transducer; 3. ultrasonic transmitter; 4. ultrasonic receiver; 5. amplitude transformer; 6. shell; 7. heat exchange tubes; 8. vibration transmission plate; 9. fan; 10. metal flexible porous fins.

Detailed ways

The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the claims of the present application.

The utility model provides an air source heat pump evaporator with integrated ultrasonic frost detection and defrosting (hereinafter referred to as evaporator, see Figures 1-7), comprising a frequency conversion generator 1, an ultrasonic transducer 2, an ultrasonic transmitter 3, an ultrasonic receiver 4, a horn 5, a housing 6, a heat exchange tube 7, a vibration transmission plate 8 and a metal flexible porous fin 10;

The heat exchange tubes 7 are located in the housing 6, and the two ends of the heat exchange tubes 7 are respectively connected to the compressor and the expansion valve of the air source heat pump; a plurality of metal flexible porous fins 10 are arrayed on the heat exchange tubes 7 and welded to the heat exchange tubes 7; a vibration transmission plate 8 is horizontally installed on the heat exchange tubes 7, and is fixedly connected to the heat exchange tubes 7 and all the metal flexible porous fins 10; a frequency conversion generator 1 and an ultrasonic transducer 2 are located in the housing 6, and the frequency conversion generator 1 is connected to the ultrasonic transducer 2 through a wire, and the output end of the ultrasonic transducer 2 is connected to one end of the horn 5, and the horn The other end of 5 is in close contact with the side of the vibration plate 8; the ultrasonic transmitter 3 and the ultrasonic receiver 4 are installed on the shell 6, the ultrasonic transmitter 3 is connected to the ultrasonic transducer 2 through a wire, the transmitting end of the ultrasonic transmitter 3 and the receiving end of the ultrasonic receiver 4 are facing the same heat exchange tube of the heat exchange tube 7, and the horizontal distances from the heat exchange tube 7 to the ultrasonic transmitter 3 and the ultrasonic receiver 4 are equal, respectively, for monitoring the frost thickness of the heat exchange tube 7; multiple groups of ultrasonic transmitters 3 and ultrasonic receivers 4 can be installed on the shell 6 to monitor the frost thickness at multiple points.

The frequency conversion generator 1 provides electrical energy to the ultrasonic transducer 2, and the ultrasonic transducer 2 converts the electrical energy into mechanical energy, namely ultrasonic waves. The horn 5 further amplifies the vibration amplitude of the ultrasonic waves, and drives the metal flexible porous fins 10 to vibrate through the vibration transmission plate 8, so that the frost on the metal flexible porous fins 10 falls off, thereby achieving the purpose of defrosting. The metal flexible porous fins 10 not only increase the heat exchange area of the heat exchange tubes, but also, compared with traditional fins, the vibration transmission plate 8 is easier to drive the metal flexible porous fins 10 to vibrate, so that the frost on the metal flexible porous fins 10 falls off, and the porous structure is easier for the frost to fall off. Since the metal flexible porous fins 10 are fixedly connected to the heat exchange tubes 7, they can also drive the heat exchange tubes 7 to vibrate, making the defrosting more thorough.

The evaporator further includes a fan 9, which is fixedly mounted on the housing 6 and directly faces the heat exchange tubes 7 and the metal flexible porous fins 10. The fan 9 blows off the residual frost on the heat exchange tubes 7 and the metal flexible porous fins 10 to avoid secondary frost. The fan 9 can also increase the air flow rate to improve the heat exchange capacity of the evaporator. The housing 6 is provided with a plurality of vents on the side wall where the fan 9 is mounted and on the side wall directly facing the fan 9.

The heat exchange tubes 7 are made of copper tubes coiled in a snake shape. The metal flexible porous fins 10 are made of aluminum fiber with a thickness of 0.2-0.5 mm, which ensures a certain flexibility and is conducive to vibration.

The working principle and process of the utility model are:

The low-temperature and low-pressure refrigerant expanded in the expansion valve of the air source heat pump enters the heat exchange tubes 7, absorbs latent heat in the air and vaporizes when flowing through the heat exchange tubes 7, thereby achieving the purpose of heat absorption; the gaseous refrigerant flowing out of the heat exchange tubes 7 is pressurized by the compressor of the air source heat pump, enters the condenser to release heat, and then flows into the expansion valve to complete the cycle.

During the operation of the evaporator, the frequency conversion generator 1 converts the 50Hz current provided by the power supply into a high-frequency current of 20kHz-40kHz to power the ultrasonic transducer 2. The ultrasonic transducer 2 drives the ultrasonic transmitter 3 to transmit ultrasonic waves to the heat exchange tubes 7. The ultrasonic receiver 4 receives the ultrasonic waves reflected back by the heat exchange tubes 7 and uses the ultrasonic ranging principle, that is, the current frost thickness is calculated based on the time of the entire process from the sending to the returning of the ultrasonic wave. If the current frost thickness is less than the preset threshold, defrosting is not required, and the ultrasonic transducer 2 continues to drive the ultrasonic transmitter 3 to transmit ultrasonic waves to continuously monitor the frost thickness. If If the current frost layer thickness is greater than or equal to the preset threshold, defrosting is required, and the ultrasonic transducer 2 no longer drives the ultrasonic transmitter 3 to work. At this time, the frequency conversion generator 1 converts the 50Hz current into a high-frequency current greater than 20kHz to power the ultrasonic transducer 2. The ultrasonic transducer 2 converts electrical energy into mechanical energy to generate ultrasonic waves. The horn 5 connected to the ultrasonic transducer 2 further increases the vibration amplitude of the ultrasonic wave. At the same time, since the horn 5 is in close contact with the vibration plate 8, the vibration plate 8 drives the heat exchange tubes 7 and the metal flexible porous fins 10 to vibrate, and the frost on the heat exchange tubes 7 and the metal flexible porous fins 10 is shaken off. At the same time, the fan 9 works to blow off the residual frost accumulated on the vibration plate 8 and the metal flexible porous fins 10. After defrosting is completed, the ultrasonic transmitter 3 and the ultrasonic receiver 4 continue to monitor the thickness of the frost layer, realizing real-time monitoring of the frost layer thickness and timely defrosting.

Anything not described in the present invention is applicable to the prior art.

Claims (3)

1. An air source heat pump evaporator with integrated ultrasonic frost detection and defrosting, comprising a shell and heat exchange tubes located in the shell; characterized in that the evaporator also includes a frequency conversion generator, an ultrasonic transducer, an ultrasonic transmitter, an ultrasonic receiver, a horn, a vibration transmission plate and a metal flexible porous fin; A number of metal flexible porous fins are arranged on the heat exchange tubes, and a vibration transmission plate is horizontally installed on the heat exchange tubes and connected to each metal flexible porous fin; the frequency generator is electrically connected to the ultrasonic transducer, the output end of the ultrasonic transducer is connected to one end of the horn, and the other end of the horn is in close contact with the vibration transmission plate; the ultrasonic transmitter and the ultrasonic receiver are located on the shell, and the ultrasonic transmitter is electrically connected to the ultrasonic transducer. 2. The air source heat pump evaporator with integrated ultrasonic frost detection and defrosting according to claim 1 is characterized in that the evaporator also includes a fan, which is installed on the outer casing and directly faces the heat exchange tubes and the metal flexible porous fins. 3. The air source heat pump evaporator with integrated ultrasonic frost detection and defrosting according to claim 1 is characterized in that the metal flexible porous fins are made of aluminum fiber with a thickness of 0.2 to 0.5 mm.