CN216432172U - A variable flow thermal expansion valve air conditioning system - Google Patents

Abstract

The utility model discloses a variable flow's thermal expansion valve air conditioning system, including compressor, condenser, thermal expansion valve and evaporimeter. The exhaust port of the compressor is connected with the air inlet of the condenser through an exhaust pipe; the liquid outlet of the condenser is connected with the inlet of the thermostatic expansion valve through a high-pressure liquid pipe; the outlet of the thermostatic expansion valve is connected with the inlet of the evaporator through a low-pressure liquid pipe; the outlet of the evaporator is connected with the air inlet of the compressor through an air suction pipe; a temperature sensing bulb arranged on the thermostatic expansion valve is arranged on the air suction pipe, and a pressure balancing pipe arranged on the thermostatic expansion valve is arranged between a balancing pipe joint of the thermostatic expansion valve and an outlet of the evaporator; an electric heating rod is arranged on the air suction pipe corresponding to the installation position of the temperature sensing bulb; an exhaust temperature sensor is arranged on the exhaust pipe; the exhaust temperature sensor and the electric heating rod are in signal connection with a controller of the air conditioning system. The utility model discloses a thermal expansion valve air conditioning system can adjust the flow of refrigerant, can also the greatly reduced cost.

Description

A variable flow thermal expansion valve air conditioning system

technical field

The utility model relates to a variable flow thermal expansion valve air conditioning system.

Background technique

As we all know, a conventional air conditioning refrigeration cycle system is mainly composed of a compressor, a condenser, an evaporator, and an expansion valve, and there are two most commonly used expansion valves: electronic expansion valve and thermal expansion valve.

The advantage of the electronic expansion valve is that in the process of use, the superheat can be adjusted in time according to the operating conditions of the air conditioner, so as to adjust the circulating flow of the refrigerant, so that the air conditioning system can operate in the best state. Compared with the electronic expansion valve, the main disadvantage of the thermal expansion valve is that in the process of use, no matter what the operating conditions of the air conditioner are, its superheat degree is constant, and the circulating flow of the refrigerant cannot be adjusted according to the current operating conditions, which will lead to In some specific working conditions (such as low ambient temperature, high outlet water temperature and other high exhaust temperature conditions), the use of thermal expansion valves cannot meet the demand for refrigerant flow of the air conditioning system.

With the development of air conditioning and refrigeration technology, the requirements for cost reduction and efficiency improvement of existing air conditioners are also higher and higher. The cost of thermal expansion valve is much lower than that of electronic expansion valve. By comparing the advantages and disadvantages of the above-mentioned electronic expansion valve and thermal expansion valve, if the air-conditioning system applied to some specific conditions, if the superheat degree of the thermal expansion valve can be changed by other means, the purpose of adjusting the refrigerant flow can also be achieved. Satisfy the air conditioning system's demand for refrigerant flow.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art and provide a variable flow thermal expansion valve air conditioning system, which can not only adjust the flow of the refrigerant, but also greatly reduce the cost of the air conditioning system.

The purpose of this utility model is achieved in this way: a variable flow thermal expansion valve air conditioning system, including a compressor, a condenser, a thermal expansion valve and an evaporator; The air inlet of the condenser is connected; the liquid outlet of the condenser is connected to the inlet of the thermal expansion valve through a high-pressure liquid pipe; the outlet of the thermal expansion valve is connected to the inlet of the evaporator through a low-pressure liquid pipe ; The outlet of the evaporator is connected with the air inlet of the compressor through a suction pipe; it is characterized in that,

The temperature sensing package that comes with the thermal expansion valve is installed on the suction pipe, and the pressure balance pipe that comes with the thermal expansion valve is installed between the balance pipe joint of the thermal expansion valve and the outlet of the evaporator. between;

An electric heating rod is installed on the suction pipe to the installation position of the temperature sensing package;

An exhaust temperature sensor is installed on the exhaust pipe;

Both the exhaust gas temperature sensor and the electric heating rod are signally connected to the controller of the air conditioning system.

In the above air conditioning system with a variable flow thermal expansion valve, wherein the condenser adopts a plate heat exchanger.

In the above-mentioned variable flow thermal expansion valve air conditioning system, the evaporator adopts a fin heat exchanger.

The countercurrent mixed evaporation mode evaporator of the utility model has the following characteristics: the temperature and pressure of the refrigerant at the outlet of the evaporator are detected by the temperature sensing package and the pressure balance tube provided with the thermal expansion valve, so as to adjust the opening degree of the thermal expansion valve. , so that the superheat of the refrigerant at the outlet of the evaporator reaches the set value. For some working conditions that require a relatively high flow of refrigerant, an electric heating rod is arranged at the temperature sensing bulb of the thermal expansion valve, so that the temperature detected by the temperature sensing bulb of the thermal expansion valve during operation is higher than the actual temperature of the refrigerant. When the temperature is higher, since the pressure remains unchanged at this time, the opening of the thermal expansion valve will increase, so that the flow of the refrigerant will increase, so that the purpose of regulating the flow can be achieved. Due to the low cost of the electric heating rod, the thermal expansion valve system can achieve the purpose of adjusting the refrigerant flow, and can greatly reduce the cost of the air conditioning system.

Description of drawings

FIG. 1 is a structural schematic diagram of the variable flow thermal expansion valve air conditioning system of the present invention.

Detailed ways

The present utility model will be further described below with reference to the accompanying drawings.

Please refer to FIG. 1, the variable flow thermal expansion valve air conditioning system of the present invention includes a compressor 1, a condenser 2, a thermal expansion valve 3, an evaporator 4, an electric heating rod 5 and an exhaust temperature sensor 6; wherein:

The exhaust port of the compressor 1 is connected to the air inlet of the condenser 2 through an exhaust pipe 20;

The liquid outlet of the condenser 2 is connected to the inlet of the thermal expansion valve 3 through the high-pressure liquid pipe 30; the condenser 2 adopts a plate heat exchanger;

The outlet of the thermal expansion valve 3 is connected to the inlet of the evaporator 4 through the low-pressure liquid pipe 40;

The outlet of the evaporator 4 is connected to the air inlet of the compressor 1 through the suction pipe 10;

The thermal expansion valve 3 comes with a temperature sensing package 3a installed on the suction pipe 10, and the thermal expansion valve 3 comes with a pressure balance pipe 3b installed between the balance pipe joint of the thermal expansion valve 3 and the outlet of the evaporator 4 ; Evaporator 4 adopts fin heat exchanger;

The electric heating rod 5 is installed on the suction pipe 10 corresponding to the installation position of the temperature sensing package 3a;

The exhaust temperature sensor 6 is installed on the exhaust pipe 20;

Both the exhaust gas temperature sensor 6 and the electric heating rod 5 are connected to the controller of the air conditioning system with signals.

The working principle of the variable flow thermal expansion valve air conditioning system of the utility model is as follows:

The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 enters the condenser 2 through the exhaust pipe 20 to exchange heat with water. After the water in the condenser 2 is heated, it flows to the user side through the water circuit for the user to use. At the same time, the gaseous refrigerant is discharged. The heat is condensed into a high temperature and high pressure liquid refrigerant, and then enters the thermal expansion valve 3 through the high pressure liquid pipe 30, and is throttled into a low temperature and low pressure liquid refrigerant through the thermal expansion valve 3, and then enters the evaporator 4 through the low pressure liquid pipe 40. 4 absorbs heat in the air, evaporates into a low temperature and low pressure gaseous refrigerant, and then enters the compressor 1 through the suction pipe 10 for compression, thereby completing a complete cycle of the air conditioning system. Among them, the flow of refrigerant in the air-conditioning system is mainly determined by the opening degree of the thermal expansion valve 3, and the opening degree of the thermal expansion valve 3 is determined by the pressure in the temperature sensing bulb 3a of the thermal expansion valve and the pressure of the thermal expansion valve. It is determined by the pressure difference of the pressure in the balance pipe 3b.

Under a certain working condition, when the air-conditioning system is running stably, the pressure in the temperature sensing bulb 3a of the thermal expansion valve and the pressure in the pressure balance pipe 3b of the thermal expansion valve remain unchanged. is also unchanged, so that the opening degree of the thermal expansion valve 3 is also unchanged, so the flow rate of the refrigerant in the air-conditioning system is also unchanged. For an ordinary thermal expansion valve air conditioning system, if the exhaust gas temperature detected by the exhaust gas temperature sensor 6 is high at this time, it means that the system has a large demand for the flow of refrigerant, but because the opening of the thermal expansion valve 3 is fixed at this time The flow rate of the system refrigerant cannot be increased by increasing the opening degree of the thermal expansion valve 3; and the thermal expansion valve air conditioning system of the present invention, if the exhaust gas temperature detected by the exhaust gas temperature sensor 6 is high, the The controller of the air-conditioning system controls the electric heating rod 5 to turn on, which is used to heat the temperature sensing bulb 3a of the thermal expansion valve, so that the temperature of the temperature sensing bulb 3a increases, thereby increasing the pressure in the temperature sensing bulb 3a of the thermal expansion valve. Since the pressure in the pressure balance tube 3b remains unchanged at this time, the pressure difference between the temperature bulb 3a of the thermal expansion valve and the pressure balance tube 3b increases, so that the opening of the thermal expansion valve 3 increases, which in turn increases flow of refrigerant. As the opening of the thermal expansion valve 3 increases, the flow of refrigerant will gradually increase, and the exhaust temperature detected by the exhaust temperature sensor 6 will gradually decrease. When the exhaust temperature decreases to the set value of the system, It means that the system has a low demand for refrigerant flow at this time. At this time, the controller of the air conditioning system controls the electric heating rod 5 to close, and the thermal expansion valve 3 will slowly return to the normal opening.

For air-conditioning systems that are used in applications with high exhaust temperatures such as low ambient temperature and high water temperature, the electronic expansion valve can be replaced with a thermal expansion valve, which can greatly reduce the cost of the air-conditioning system.

The above embodiments are only for the purpose of illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical field can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention, and should be defined by the claims.

Claims (3)

1. A variable flow thermal expansion valve air conditioning system, comprising a compressor, a condenser, a thermal expansion valve and an evaporator; an exhaust port of the compressor is connected to an air inlet of the condenser through an exhaust pipe ; The liquid outlet of the condenser is connected to the inlet of the thermal expansion valve through a high-pressure liquid pipe; the outlet of the thermal expansion valve is connected to the inlet of the evaporator through a low-pressure liquid pipe; the outlet of the evaporator is The suction pipe is connected with the air inlet of the compressor; it is characterized in that, The temperature sensing package that comes with the thermal expansion valve is installed on the suction pipe, and the pressure balance pipe that comes with the thermal expansion valve is installed between the balance pipe joint of the thermal expansion valve and the outlet of the evaporator. between; An electric heating rod is installed on the suction pipe to the installation position of the temperature sensing package; An exhaust temperature sensor is installed on the exhaust pipe; Both the exhaust gas temperature sensor and the electric heating rod are signally connected to the controller of the air conditioning system. 2 . The air conditioning system with a variable flow thermal expansion valve according to claim 1 , wherein the condenser adopts a plate heat exchanger. 3 . 3 . The air conditioning system with a variable flow thermal expansion valve according to claim 1 , wherein the evaporator adopts a fin heat exchanger. 4 .

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