CN210292405U

CN210292405U - Constant temperature cold water machine

Info

Publication number: CN210292405U
Application number: CN201920797959.0U
Authority: CN
Inventors: 张鹏
Original assignee: Guangzhou Teyu Electromechanical Co ltd
Current assignee: Guangzhou Teyu Electromechanical Co ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-04-10
Anticipated expiration: 2029-05-29

Abstract

The utility model discloses a constant temperature cold water machine, including refrigerating unit and water tank, refrigerating unit includes compressor, condenser, first electronic expansion valve and evaporimeter, and the evaporimeter is placed in the water tank, and compressor, condenser, first electronic expansion valve and evaporimeter connect gradually and form refrigerant major loop. The refrigerating unit also comprises a second electronic expansion valve and a temperature controller, and the outlet of the compressor, the second electronic expansion valve and the inlet of the compressor are sequentially connected to form a refrigerant bypass unloading loop. The temperature controller is respectively connected with the first electronic expansion valve and the second electronic expansion valve and is used for controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve so as to adjust the refrigerant flow of the refrigerant main loop and the refrigerant bypass unloading loop. The constant-temperature water chiller can regulate the flow of the refrigerant flowing through the first electronic expansion valve and the second electronic expansion valve according to the water temperature, increase or reduce the refrigerating capacity of a main refrigerant loop, ensure the constant water temperature and improve the regulating precision of the water temperature.

Description

Constant temperature cold water machine

Technical Field

The utility model relates to the field of refrigeration technology, especially, relate to a constant temperature cold water machine.

Background

The water chiller is a cooling device providing constant temperature, constant flow and constant pressure, achieves the refrigeration effect through vapor compression or absorption type circulation, and is widely applied to the fields of air conditioners, industrial refrigeration and the like. At present, in order to control the constant temperature of a water chiller, an electromagnetic valve is usually added in a refrigeration loop, for example, the electromagnetic valve is connected and arranged at the outlet of a compressor and the inlet of an evaporator, and the opening and closing of the electromagnetic valve is controlled by a controller to adjust the amount of refrigerant and achieve the purpose of controlling the water temperature. However, the existing constant-temperature water chiller has the following defects: the water temperature is regulated and controlled by using an electromagnetic valve, the water outlet temperature can only be controlled to be about +/-0.5 ℃, and the regulation precision of the water outlet temperature is low.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a constant-temperature water chiller improves the water temperature adjusting precision while ensuring the constant water temperature.

The purpose of the utility model is realized by adopting the following technical scheme:

a constant-temperature water chiller comprises a refrigeration unit and a water tank, wherein the refrigeration unit comprises a compressor, a condenser, a first electronic expansion valve and an evaporator, the evaporator is placed in the water tank, and the compressor, the condenser, the first electronic expansion valve and the evaporator are sequentially connected to form a refrigerant main loop;

the refrigerating unit also comprises a second electronic expansion valve and a temperature controller, wherein an outlet of the compressor, the second electronic expansion valve and an inlet of the compressor are sequentially connected to form a refrigerant bypass unloading loop; the temperature controller is respectively connected with the first electronic expansion valve and the second electronic expansion valve and is used for controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve so as to adjust the refrigerant flow of the refrigerant main loop and the refrigerant bypass unloading loop.

Further, a drying filter is arranged between the condenser and the first electronic expansion valve.

Furthermore, a condensing fan for dissipating heat of the condenser is arranged above the condenser.

Furthermore, a water pump is arranged on the water tank and arranged below the water tank, and the water pump is used for pumping out water in the water tank.

Furthermore, a water return inlet and a water outlet are further formed in the water tank, and the water return inlet is higher than the water outlet.

Further, the temperature controller is a PID temperature controller.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses a constant temperature cold water machine, including refrigerant major loop and refrigerant bypass uninstallation return circuit, the refrigerant major loop is used for the refrigeration of cold water machine. The temperature controller is connected with the first electronic expansion valve of the refrigerant main loop and the second electronic expansion valve of the refrigerant bypass unloading loop, the temperature controller respectively regulates and controls the flow of the refrigerant flowing through the first electronic expansion valve and the second electronic expansion valve according to the water temperature in the water tank, the refrigerating capacity of the refrigerant main loop is increased or reduced, and therefore the water temperature in the water tank is guaranteed to be constant, and meanwhile the adjusting precision of the water temperature can be improved.

Drawings

Fig. 1 is a schematic structural view of a constant temperature water chiller of the present invention.

In the figure: 10. a water tank; 11. a return water inlet; 12. a water pump; 13. a water outlet; 20. a compressor; 30. a condenser; 40. a first electronic expansion valve; 50. an evaporator; 60. a temperature controller; 70. a second electronic expansion valve; 80. drying the filter; 90. a condensing fan.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

In the following embodiments, unless otherwise specified, the terms "first" and "second" are used for distinguishing similar structures and should not be construed as a sequential relationship, a primary relationship or a secondary relationship.

A constant temperature water chiller, as shown in figure 1, comprises a refrigeration unit and a water tank 10, wherein the refrigeration unit comprises a compressor 20, a condenser 30, a first electronic expansion valve 40 and an evaporator 50, and the evaporator 50 is arranged in the water tank 10. The compressor 20, the condenser 30, the first electronic expansion valve 40 and the evaporator 50 are sequentially connected through a pipeline to form a main refrigerant loop, and the main refrigerant loop is used for refrigerating the water chiller.

The refrigeration unit further comprises a temperature controller 60 and a second electronic expansion valve 70, an outlet of the compressor 20, the second electronic expansion valve 70 and an inlet of the compressor 20 are sequentially connected to form a refrigerant bypass unloading loop, and the refrigerant bypass unloading loop can enable high-temperature and high-pressure gas at the outlet of the compressor 20 to directly flow into the inlet of the compressor 20 through the second electronic expansion valve 70, so that the refrigerating capacity in a main refrigerant loop is reduced. The temperature controller 60 is respectively connected to the first electronic expansion valve 40 and the second electronic expansion valve 70, and is configured to control the opening degrees of the first electronic expansion valve 40 and the second electronic expansion valve 70, so as to adjust the refrigerant flow rates of the refrigerant main circuit and the refrigerant bypass unloading circuit.

The refrigerant main loop is used for refrigeration, and the refrigeration principle of the refrigerant main loop is as follows: the compressor 20 discharges high-pressure high-temperature gaseous refrigerant into the condenser 30, the condenser 30 cools the high-pressure high-temperature gaseous refrigerant into high-pressure normal-temperature liquid refrigerant, the first electronic expansion valve 40 throttles and reduces the pressure of the high-pressure normal-temperature liquid refrigerant into low-temperature low-pressure vapor-liquid two-phase refrigerant, the low-temperature low-pressure vapor-liquid two-phase refrigerant is discharged into the evaporator 50, the refrigerant in the evaporator 50 exchanges heat with circulating water in the water tank 10, the heat discharged by the water is reduced in temperature, and the liquid refrigerant absorbs the heat and turns into the gaseous refrigerant to return to the compressor. The outlet and the inlet of the refrigerant bypass unloading circuit are connected through the second electronic expansion valve 70, and the high-pressure and high-temperature gaseous refrigerant discharged from the compressor 20 is directly discharged to the inlet of the compressor 20 through the second electronic expansion valve 70.

Based on the above structure, when the temperature of the water in the water tank 10 is lowered to the set value of the temperature controller 60, the temperature controller 60 controls and adjusts the opening degree of the first electronic expansion valve 40 to reduce the refrigerant flowing through the main refrigerant circuit, and simultaneously maintains the opening degree of the second electronic expansion valve 70 or increases the opening degree of the second electronic expansion valve 70, so that the high-temperature and high-pressure gas flowing through the main refrigerant circuit is shunted and discharged back to the compressor 20, thereby reducing the cooling capacity of the main refrigerant circuit. When the temperature of the water in the water tank 10 increases, the temperature controller 60 adjusts the opening degree of the first electronic expansion valve 40 to increase the refrigerant flowing through the main refrigerant circuit, and simultaneously maintains the opening degree of the second electronic expansion valve 70 unchanged or decreases the opening degree of the second electronic expansion valve 70 to decrease the unloading amount of the refrigerant bypass unloading circuit, so that the cooling capacity of the main refrigerant circuit can be increased. The opening degrees of the first electronic expansion valve 40 and the second electronic expansion valve 70 are controlled by the temperature controller 60, so that the water temperature adjustment accuracy can be improved while the water temperature is ensured to be constant. Further, a dry filter 80 is provided between the condenser 30 and the first electronic expansion valve 40, and the dry filter 80 is installed in the main refrigerant circuit through a pipe. The dry filter 80 can remove impurities and moisture in the main refrigerant circuit, and reduce the damage of the impurities and the moisture to the refrigerating unit.

Further, a condensing fan 90 is disposed above the condenser 30, and the condensing fan 90 mainly dissipates heat to the condenser 30 to reduce the temperature of the refrigerant in the condenser 30.

The water tank 10 is connected with a water pump 12, the water pump 12 is arranged below the water tank 10, and the water pump 12 is used for pumping out water in the water tank 10. More specifically, the water tank 10 is further provided with a backwater inlet 11 and a water outlet 13, the water pump 12 is arranged on the water outlet 13, and water in the water tank 10 can be pumped out through the water pump 12. Preferably, the level of the return water inlet 11 is higher than the level of the water outlet 13, which is more advantageous for drawing in and out the water in the water tank 10. More specifically, the temperature controller 60 is a PID temperature controller 60, and the PID temperature controller 60 performs arithmetic control to control the combination of the opening degrees of the first electronic expansion valve 40 and the second electronic expansion valve 70, so that the accuracy of the water temperature is ± 0.1 ℃.

The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a constant temperature cold water machine which characterized in that: the refrigeration system comprises a refrigeration unit and a water tank, wherein the refrigeration unit comprises a compressor, a condenser, a first electronic expansion valve and an evaporator, the evaporator is placed in the water tank, and the compressor, the condenser, the first electronic expansion valve and the evaporator are sequentially connected to form a refrigerant main loop;

2. The thermostatic water chiller of claim 1 wherein: and a drying filter is arranged between the condenser and the first electronic expansion valve.

3. The thermostatic water chiller of claim 1 or 2 wherein: and a condensing fan for radiating the condenser is arranged above the condenser.

4. The thermostatic water chiller of claim 1 or 2 wherein: the water tank is provided with a water pump, and the water pump is arranged below the water tank and used for pumping out water in the water tank.

5. The thermostatic water chiller of claim 1 or 2 wherein: the water tank is also provided with a return water inlet and a water outlet, and the return water inlet is higher than the water outlet.

6. The thermostatic water chiller of claim 1 or 2 wherein: the temperature controller is a PID temperature controller.