Refrigerating unit with evaporation cold direct expansion high-low tail end load self-adaptive adjustment function

Abstract

The utility model provides an evaporation cold direct expansion high-low tail end load self-adaptive adjusting refrigerating unit which comprises an evaporation condensing unit on the outdoor side and a tail end evaporator on the indoor side, and the outdoor side comprises a gas-liquid separator, a compressor, a condenser and a liquid storage device which are sequentially connected. The two sides of the tail end evaporators are connected with the liquid storage device and the gas-liquid separator respectively, a tail air suction cooling electromagnetic valve is arranged between the output end of the gas-liquid separator and the outlet end of the condenser, a high-low pressure difference adjusting electromagnetic valve is arranged between the input end and the output end of the compressor, and the number of the tail end evaporators is at least two. The tail end evaporators are connected in parallel. Self-adaptive adjustment is carried out through the opening amount and the opening load of the tail end evaporator, and normal operation of the system is guaranteed when the tail end evaporator of the evaporative cold direct expansion refrigerating unit system is opened at will.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration equipment technical field, concretely relates to a kind of evaporative cooling direct expansion high-low terminal load self-adaptive regulation refrigerating unit. BACKGROUND

[0002] The evaporative cooling direct expansion refrigerating unit has very good system energy efficiency ratio at present, has been marketized and is widely used in large factory, shopping mall, cold storage, school, hospital, medicine and other places, and its high energy efficiency ratio enables evaporative cooling unit to be widely used in refrigeration market, especially in dry and high-temperature area or dry and high-temperature operating environment, evaporative cooling unit has good refrigeration energy efficiency ratio, which can greatly save customer operating cost;However, the evaporative cooling direct expansion unit has strict requirements for the matching of refrigeration terminal evaporator, improper configuration can lead to uneven load distribution of refrigeration system, thereby causing refrigeration system failure, especially when the refrigeration system terminal evaporator has high-low load and the load difference is too large, refrigeration system is prone to fail to operate normally, and even damage compressor. SUMMARY

[0003] The utility model embodiment provides a kind of evaporative cooling direct expansion high-low terminal load self-adaptive regulation refrigerating unit, the adaptive switch of tail suction cooling solenoid valve, high-low pressure difference regulating solenoid valve is realized the matching of any size load of terminal evaporator and the opening of any size load of terminal evaporator, to solve the problem of uneven load distribution of refrigeration system.

[0004] The utility model discloses a kind of evaporative cooling direct expansion high-low terminal load self-adaptive regulation refrigerating unit, including the evaporative condensing unit of room outdoor side and the terminal evaporator of indoor side, the room outdoor side includes the gas-liquid separator, compressor, condenser, liquid accumulator connected in sequence, the terminal evaporator two sides are connected with liquid accumulator and gas-liquid separator respectively, tail suction cooling solenoid valve is arranged between the output end of gas-liquid separator and the outlet end of condenser, high-low pressure difference regulating solenoid valve is arranged between the input end and the output end of compressor, the terminal evaporator at least has two, each terminal evaporator is connected in parallel.

[0005] Further, the output end of the compressor is provided with a temperature detection device and a first pressure detection device for detecting the temperature and pressure of the compressor discharge gas respectively;The input end of the compressor is provided with a second pressure detection device for detecting the pressure of the gas sucked into the compressor.

[0006] Further, the data detected by the temperature detection device, the first pressure detection device, the temperature detection device and the first pressure detection device are compared with the pre-set temperature and pressure data of the system to control the switch of the tail suction cooling solenoid valve and the high-low pressure difference regulating solenoid valve.

[0007] Further, when the system detects that the temperature of the exhaust gas of the compressor exceeds the system set opening temperature, the tail suction cooling electromagnetic valve opens.

[0008] When the system detects that the pressure difference between the suction gas and the exhaust gas of the compressor is greater than the system set opening pressure, the high-low pressure difference regulating electromagnetic valve opens.

[0009] Further, the real-time temperature of the exhaust gas of the compressor output end is obtained, and the tail suction cooling electromagnetic valve is controlled according to the real-time temperature of the exhaust gas. When the system detects that the temperature of the exhaust gas of the compressor exceeds the system set opening temperature, the tail suction cooling electromagnetic valve opens. When the system detects that the temperature of the exhaust gas of the compressor is lower than the system set closing temperature, the tail suction cooling electromagnetic valve closes.

[0010] The pressure of the exhaust gas of the compressor output end and the pressure of the suction gas of the input end are obtained, and the high-low pressure difference regulating electromagnetic valve is controlled according to the real-time pressure difference of the gas. When the system detects that the pressure difference between the suction gas and the exhaust gas of the compressor is greater than the system set opening pressure, the high-low pressure difference regulating electromagnetic valve opens. When the system detects that the pressure difference between the suction gas and the exhaust gas of the compressor is less than the system set closing pressure, the high-low pressure difference regulating electromagnetic valve closes.

[0011] Further, an oil separator is arranged between the compressor and the condenser. The input end of the oil separator is connected to the output end of the compressor, the gas outlet end of the oil separator is connected to the input end of the condenser, and the oil outlet end of the oil separator is connected to the oil return end of the compressor.

[0012] Further, the oil separator comprises a cylinder body. The cylinder body is provided with an air inlet mechanism connected to the output end of the compressor, a gas outlet connected to the input end of the condenser, and an oil outlet connected to the oil return end of the compressor. An oil blocking net is arranged in the cylinder body. An adaptive valve is further arranged on the air inlet mechanism. The adaptive valve is connected to an adaptive valve regulator. The opening direction of the adaptive valve is obliquely cut with the wall of the cylinder body.

[0013] Further, a return oil electromagnetic valve is arranged between the oil outlet end of the oil separator and the oil return end of the compressor.

[0014] Further, a drying filter is further arranged between the liquid reservoir and the terminal evaporator. The input end of the drying filter is connected to the output end of the liquid reservoir, and the output end of the drying filter is connected to the input end of the terminal evaporator.

[0015] Further, the drying filter is arranged on the main line of the output end of the liquid reservoir.

[0016] Further, the dry filter is multiple, and the dry filter is arranged on the branch of the terminal evaporator.

[0017] Further, the dry filter is multiple, and the dry filter is arranged on the branch of the terminal evaporator.

[0018] Further, the dry filter is multiple, and the dry filter is arranged on the branch of the terminal evaporator.

[0019] Further, the dry filter is multiple, and the dry filter is arranged on the branch of the terminal evaporator.

[0020] Compared with the prior art, the beneficial technical effects of the utility model are that: the utility model discloses an evaporative cold direct expansion high and low terminal load self-adjusting refrigerating unit, which can realize load self-adaptive adjustment of an outdoor evaporative condensing unit according to load changes of an evaporator terminal and terminal use temperature changes, realize self-adaptive adjustment of refrigerant flow distribution of the outdoor evaporative condensing unit and maintain refrigerant pressure balance, and guarantee safe operation of a refrigeration system.

[0021] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, which can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the utility model more obvious and easy to understand, the following specific embodiments of the utility model are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit or otherwise contravene the scope of the disclosure. Throughout the drawings, like referenced numerals indicate similar or like components.

[0023] ATTACHMENT Figure 1The utility model discloses a kind of evaporative cold direct expansion high-low terminal load self-adaptive adjustment refrigerating unit structure schematic diagram.

[0024] Attached Figure 2 The utility model discloses a kind of evaporative cold direct expansion high-low terminal load self-adaptive adjustment refrigerating unit oil separator structure schematic diagram.

[0025] Attached Figure 3 The utility model discloses a kind of evaporative cold direct expansion high-low terminal load self-adaptive adjustment refrigerating unit oil separator structure schematic diagram.

[0026] In the drawings:

[0027] 1 is gas-liquid separator, 2 is compressor, 3 is condenser, 4 is liquid accumulator, 5 is terminal evaporator, 6 is tail suction cooling solenoid valve, 7 is high-low pressure difference regulating solenoid valve, 8 is throttling device, 9 is liquid supply solenoid valve, 10 is dry filter, 11 is cylinder body, 12 is gas outlet, 13 is self-adaptive valve regulator, 14 is self-adaptive valve, 15 is air intake mechanism, 16 is oil blocking net, 17 is oil outlet, 18 is fluid pipe, 19 is central pipe, 20 is vortex plate, 21 is fixing frame, 22 is oil separator, 23 is oil return solenoid valve. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings; however, they are not limited thereto and can be implemented in various forms. It is to be understood that the embodiments disclosed herein are to be considered merely exemplary and that the scope of the disclosure is not to be limited to the specifically disclosed embodiments.

[0029] It is to be understood that the terms "including", "comprising", and any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0030] Referring to the drawings Figure 1The utility model discloses an evaporative cold direct expansion high low end load self -adaptation regulation's refrigerating unit, including the evaporative condensing unit of outdoor side and the end evaporator 5 of indoor side, and outdoor side includes the liquid -gas separator, compressor 2, condenser 3, liquid accumulator 4 that connect gradually, and the liquid -gas separator is connected to liquid accumulator 4 and gas -liquid separator respectively on both sides of end evaporator 5, and the outlet end of liquid -gas separator is provided with tail suction cooling solenoid valve 6 between condenser 3, and the input end and the output end of compressor 2 are provided with high low pressure difference regulating solenoid valve 7, and end evaporator 5 has at least two, and each end evaporator 5 is connected in parallel.

[0031] The utility model discloses the opening of end evaporator 5 is adjusted to tail suction cooling solenoid valve 6, high low pressure difference regulating solenoid valve 7 switch to the outdoor side evaporative condensing unit is carried out load self -adaptation regulation, under the operation of variable condition, or when the end evaporator 5 load changes of different size load, refrigerant circulation quantity changes, to cause the temperature, pressure of compressor 2 change, and tail suction cooling solenoid valve 6, high low pressure difference regulating solenoid valve 7 are according to temperature, pressure change and carry out self -adaptation opening or close, and the protection of compressor 2 makes compressor 2 consistently be in safe operation state, to guarantee refrigeration system under high low load normal operation.

[0032] The output of compressor 2 is provided with temperature detection device and first pressure detection device, is used for detecting the temperature and pressure of compressor 2 exhaust gas respectively, and the input of compressor 2 is provided with second pressure detection device, is used for detecting the pressure of the gas that absorbs into compressor 2.

[0033] The switch of tail suction cooling solenoid valve 6, high low pressure difference regulating solenoid valve 7 is controlled by comparing the data detected by temperature detection device, first pressure detection device and first pressure detection device with the temperature and pressure data that system is set in advance.

[0034] Temperature detection device is used for detecting the real -time temperature of the gas that the output of compressor 2 exports, and first pressure detection device is used for detecting the real -time pressure of the gas that the output of compressor 2 exports, and second pressure detection device is used for detecting the real -time pressure of the gas that the input of compressor 2 imports, according to the temperature and pressure range of compressor 2 suitable, is set in advance before use, and when working, according to the value of real -time temperature and real -time pressure and the range that is set in advance compares, to control the switch of tail suction cooling solenoid valve 6, high low pressure difference regulating solenoid valve 7.

[0035] When system detects that the temperature of the gas that compressor 2 exports exceeds system set opening temperature, tail suction cooling solenoid valve 6 opens;

[0036] When system detects that the pressure difference of the gas that compressor 2 absorbs and exports is greater than system set opening pressure, high low pressure difference regulating solenoid valve 7 opens.

[0037] The control method of the tail suction cooling electromagnetic valve 6 and the high-low pressure difference regulating electromagnetic valve 7:

[0038] The real-time temperature of the exhaust gas at the output end of the compressor 2 is obtained, and the tail suction cooling electromagnetic valve 6 is controlled to open or close according to the real-time temperature of the exhaust gas; when the system detects that the temperature of the exhaust gas of the compressor 2 exceeds the opening temperature set by the system, the tail suction cooling electromagnetic valve 6 is opened; when the system detects that the temperature of the exhaust gas of the compressor 2 is lower than the closing temperature set by the system, the tail suction cooling electromagnetic valve 6 is closed.

[0039] The exhaust gas pressure at the output end of the compressor 2 and the suction gas pressure at the input end are obtained, and the high-low pressure difference regulating electromagnetic valve 7 is controlled to open or close according to the real-time pressure difference of the gas; when the system detects that the pressure difference between the suction gas and the exhaust gas of the compressor 2 is greater than the opening pressure set by the system, the high-low pressure difference regulating electromagnetic valve 7 is opened; when the system detects that the pressure difference between the suction gas and the exhaust gas of the compressor 2 is less than the closing pressure set by the system, the high-low pressure difference regulating electromagnetic valve 7 is closed.

[0040] Under variable working conditions or when the load of the terminal evaporator 5 changes at different sizes, the circulation amount of the refrigerant changes, thereby causing the temperature and pressure of the compressor 2 to change, which easily leads to the compressor 2 not working normally. For example, when the terminal evaporator 5 with a larger load among the terminal evaporators 5 with different sizes is closed, the circulation amount of the refrigerant rapidly decreases, thereby causing the temperature of the exhaust gas at the output end of the compressor 2 to be too large, the suction gas pressure at the input end to increase, and the exhaust gas pressure at the output end to decrease. When the real-time temperature of the exhaust gas is greater than the opening temperature set by the system in advance, the tail suction cooling electromagnetic valve 6 is opened, the refrigerant condensed by the condenser 3 returns to the input end of the compressor 2, and the compressor 2 is cooled, thereby protecting the safe operation of the compressor 2. When the pressure difference between the suction gas and the exhaust gas of the compressor 2 is greater than the opening pressure set by the system in advance, the high-low pressure difference regulating electromagnetic valve 7 is opened, and the gas at the output end of the compressor 2 returns to the input end of the compressor 2, thereby maintaining the stability of the suction and exhaust pressure difference of the compressor 2 through backflow. Conversely, when the real-time temperature of the exhaust gas is less than the closing temperature set by the system in advance, the tail suction cooling electromagnetic valve 6 is closed; when the pressure difference between the suction gas and the exhaust gas of the compressor 2 is less than the closing pressure set by the system in advance, the high-low pressure difference regulating electromagnetic valve 7 is closed, and the compressor 2 is in a safe operation state, thereby enabling the refrigeration system to work normally.

[0041] An oil separator 22 is arranged between the compressor 2 and the condenser 3, an input end of the oil separator 22 is connected to an output end of the compressor 2, an air outlet end of the oil separator 22 is connected to an input end of the condenser 3, and an oil outlet end of the oil separator 22 is connected to an oil return end of the compressor 2. The gas discharged from the output end of the compressor 2 contains lubricating oil, if the lubricating oil is not separated, the lubricating oil entering the refrigeration system will affect the refrigeration efficiency and increase the energy consumption. An oil separator 22 is arranged between the compressor 2 and the condenser 3 to separate the lubricating oil and the gas, and the separated lubricating oil is returned to the oil return end of the compressor 2 from the oil outlet end.

[0042] Referring to the accompanying drawings Figure 2 The oil separator 22 comprises a cylinder body 11, the cylinder body 11 is provided with an air inlet mechanism 15 connected to the output end of the compressor 2, an air outlet 12 connected to the input end of the condenser 3, and an oil outlet 17 connected to the oil return end of the compressor 2, the inside of the cylinder body 11 is provided with an oil blocking net 16, the air inlet mechanism 15 is further provided with an adaptive valve 14, the adaptive valve 14 is connected to an adaptive valve regulator 13, and the opening direction of the adaptive valve is obliquely cut with the wall of the cylinder body 11. The air inlet speed of the oil-gas mixed fluid is adjusted to stabilize the rotational flow speed, especially when the compressor 2 is unloaded, the rotational flow speed does not affect the oil-gas separation effect; by increasing the adaptive valve 14, the speed of the oil-gas mixed fluid in the oil-gas mixed pipe remains stable when entering the cylinder body 11, and the rotational flow is not affected by the change of the exhaust capacity caused by the change of the use environment of the compressor 2, thereby affecting the oil-gas separation. The inside of the cylinder body 11 is provided with the oil blocking net 16, the oil-gas mixed fluid discharged from the compressor 2 flows into the cylinder body 11 tangentially under the guidance of the adaptive valve 14, and the oil-gas mixed fluid does a downward circumferential spiral motion along the inner wall in the cylinder body 11. Under the action of centrifugal force, the oil droplets with large density contact the inner wall and are adsorbed on the inner wall under the action of rotational flow, and flow downward along the inner wall under the action of gravity. Another part of the oil droplets with small density does not enter the rotational flow, and is adsorbed on the oil blocking net 16 in the inside of the cylinder body 11 after contacting the oil blocking net 16, and the collected oil droplets are discharged from the oil outlet 17 under the action of gravity.

[0043] An oil return electromagnetic valve 23 is arranged between the oil outlet end of the oil separator 22 and the oil return end of the compressor 2.

[0044] A drying filter 10 is further arranged between the liquid accumulator 4 and the terminal evaporator 5, an input end of the drying filter 10 is connected to an output end of the liquid accumulator 4, and an output end of the drying filter 10 is connected to an input end of the terminal evaporator 5.

[0045] In a specific embodiment, the drying filter 10 is arranged on the main line at the output end of the liquid accumulator 4, and the drying filter 10 is one, and the filtered refrigerant enters the evaporators of each branch.

[0046] In another specific embodiment, the drying filter 10 is provided in multiple numbers, and the drying filter 10 is arranged on the branch of the terminal evaporator 5, and the refrigerant flowing into the branch passes through the drying filter 10 to be dried and then enters the corresponding evaporator.

[0047] The terminal evaporator 5 and the liquid storage tank 4 are further provided with a liquid supply electromagnetic valve 9 corresponding to the terminal evaporator 5, which is used to control the opening and closing of the terminal evaporator 5.

[0048] Referring to the accompanying drawings Figure 3 The liquid supply electromagnetic valve 9 and the terminal evaporator 5 are further provided with a flow resistance device, which comprises a fluid pipe 18, a center pipe 19 arranged in the middle of the fluid pipe 18, a vortex plate 20 fixed on the center pipe 19 and arranged in a spiral along the length direction of the center pipe, and the center pipe 19 is fixed on the fluid pipe 18 through a fixing frame 21.

[0049] In a preferred embodiment, the liquid supply electromagnetic valve 9 and the terminal evaporator 5 are further provided with a throttling device 8, which is used to adjust the temperature and pressure of the refrigerant flowing into the terminal evaporator 5, and the flow resistance device is arranged between the throttling device 8 and the terminal evaporator 5. When the flow resistance device is not arranged, the low-pressure refrigerant liquid forms a laminar flow in the flow due to the influence of the refrigeration pipeline, thereby increasing the resistance and affecting the flow rate. The utility model forms a stable and orderly vortex flow by arranging the flow resistance device between the throttling device 8 and the terminal evaporator 5, and using the vortex plate 20 to make the refrigerant realize forced rotation in the pipeline after throttling, thereby preventing the refrigerant from forming a laminar flow state due to the change of the refrigerant flow in the pipeline, reducing the resistance change in the refrigerant pipeline after throttling caused by the change of the refrigerant flow, and improving the liquid pressure entering the evaporator.

[0050] The above-mentioned embodiment numbers of the utility model are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0051] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative but not restrictive. Those skilled in the art can make many forms under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection of the utility model.

Claims

1. An evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment, characterized by: It includes an evaporative condensing unit on the outdoor side and a terminal evaporator on the indoor side. The outdoor side includes a gas-liquid separator, a compressor, a condenser, and a liquid reservoir connected in sequence. The liquid reservoir and the gas-liquid separator are connected on both sides of the terminal evaporator respectively. A tail suction cooling solenoid valve is provided between the output end of the gas-liquid separator and the outlet end of the condenser. A high and low pressure difference regulating solenoid valve is provided between the input end and the output end of the compressor. There are at least two terminal evaporators, and each terminal evaporator is connected in parallel.

2. The evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment according to claim 1, characterized in that: The output end of the compressor is provided with a temperature detection device and a first pressure detection device, which are respectively used to detect the temperature and pressure of the compressor exhaust gas; the input end of the compressor is provided with a second pressure detection device, which is used to detect the pressure of the gas sucked into the compressor.

3. The evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment according to claim 2, characterized in that: The switching of the tail air intake cooling solenoid valve and the high and low pressure difference regulating solenoid valve is controlled by comparing the data detected by the temperature detecting device, the first pressure detecting device and the temperature detecting device and the first pressure detecting device with the temperature and pressure data preset by the system.

4. The evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment according to claim 3, characterized in that: obtaining the real-time temperature of the exhaust gas at the output end of the compressor, and controlling the switch of the tail air intake cooling solenoid valve according to the real-time temperature of the exhaust gas. When the system detects that the exhaust gas temperature of the compressor exceeds the opening temperature set by the system, the tail air intake cooling solenoid valve is opened; when the system detects that the exhaust gas temperature of the compressor is lower than the closing temperature set by the system, the tail air intake cooling solenoid valve is closed; The exhaust gas pressure at the output end and the intake gas pressure at the input end of the compressor are obtained, and the high and low pressure difference regulating solenoid valve switches are controlled according to the real-time pressure difference of the gas; when the system detects that the pressure difference between the intake gas and the exhaust gas of the compressor is greater than the opening pressure set by the system, the high and low pressure difference regulating solenoid valve opens; when the system detects that the pressure difference between the intake gas and the exhaust gas of the compressor is less than the closing pressure set by the system, the high and low pressure difference regulating solenoid valve closes.

5. The evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment according to claim 1, characterized in that: An oil separator is provided between the compressor and the condenser, the input end of the oil separator is connected to the output end of the compressor, the air outlet end of the oil separator is connected to the input end of the condenser, and the oil outlet end of the oil separator is connected to the oil return end of the compressor.

6. The evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment according to claim 1, characterized in that: A drying filter is further provided between the liquid reservoir and the terminal evaporator, wherein the input end of the drying filter is connected to the output end of the liquid reservoir, and the output end of the drying filter is connected to the input end of the terminal evaporator.

7. The evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment according to claim 1, characterized in that: A liquid supply solenoid valve is further provided between the terminal evaporator and the liquid reservoir. The liquid supply solenoid valve corresponds to the terminal evaporator one-to-one and is used to control the switch of the terminal evaporator.

8. The evaporative cooling direct expansion refrigeration unit with adaptive high and low terminal load adjustment according to claim 7, characterized in that: A damper is also arranged between the liquid supply solenoid valve and the end evaporator. The damper includes a fluid tube, a central tube arranged in the middle of the fluid tube, and a vortex plate fixed on the central tube and spirally arranged around the central tube along the length direction. The central tube is fixed to the fluid tube by a fixing frame.

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