Air suction dryness adjusting device of air cooling refrigeration system

Abstract

The utility model discloses a suction dryness adjusting device of a gas cooling refrigeration system, which is characterized in that a liquid outlet of a condenser is connected with an inlet of a first meter, and a gas inlet of the condenser is connected with an inlet of a first valve and an outlet of a second meter; an outlet of the first meter is connected with an inlet of the second valve, a plurality of different set values and a plurality of different electric trigger signals are pre-stored in the first meter, each set value corresponds to one electric trigger signal, and the electric trigger signal corresponding to the set value is sent to the second valve when the measured value reaches a certain set value; a first valve outlet is connected with a gas cooler inlet; an inlet of the second meter is connected with an outlet of the oil-liquid separator; an outlet of the second valve is connected with an inlet of the gas cooler, a plurality of opening degrees are pre-stored in the second valve, each opening degree corresponds to one electric trigger signal, and the second valve executes different opening degrees according to the received electric trigger signals; the outlet of the gas cooler is connected with the inlet of the tested compressor; an inlet of the oil-liquid separator is connected with an outlet of the tested compressor; according to the utility model, the specified air suction dryness of the tested compressor can be realized.

Description

Technical Field

[0001] The utility model relates to the testing field, in particular to a gas-cooling refrigeration system suction dryness regulating device for compressor performance. Background Art

[0002] The national standard GB / T 5773-2016 "Performance Test Methods for Volumetric Refrigerant Compressors" stipulates that the refrigeration capacity performance test of a single-stage compressor includes two test methods, namely, Method X and Method Y, and the two methods should be measured simultaneously. The two methods used in practice can be 5.1.4 Method D2-Exhaust Pipe Refrigerant Gas Flow Meter Method and 5.1.7 Method J-Refrigerant Gas Cooling Method. These two methods are combined into a complete set of compressor performance test systems. The main working principle of this test method is that the compressor exhaust passes through the gas flow meter, one way passes through the condenser and then enters the gas cooler after liquid phase throttling, and the other way directly enters the gas cooler after gas phase throttling. The two refrigerants are mixed in the gas cooler and then enter the compressor suction port. According to the energy conservation principle of the gas cooler inlet and outlet, the compressor calculated mass flow rate of the gas cooling method can be obtained, while the refrigerant flow rate of the X method is the actual measured flow rate of the gas flow meter.

[0003] The above national standard stipulates various test parameters for compressor testing, such as suction pressure, exhaust pressure, suction temperature, etc., but does not define how to achieve the situation where the compressor suction controls a certain refrigerant dryness. There is no control solution for the suction dryness of the gas cooling refrigeration system in the prior art, and the suction dryness of the body cooling refrigeration system will affect the accuracy of the compressor performance test.

[0004] Chinese patent CN202110185633.4 compressor suction dryness optimization control method, device and air conditioner.

[0005] Chinese Patent CN202010110556.1 A method, device, storage medium and air conditioner for controlling the air dryness of an air conditioner.

[0006] Chinese patent CN202111045020.7 A dryness control method, device and storage medium.

[0007] Chinese patent CN202311100669.3 discloses an air source heat pump unit and a method for controlling the dryness of the air-supplementing refrigerant therein.

[0008] The above patent applications all involve suction air dryness control schemes, but they achieve rough compressor suction control by adjusting the operating frequency of the compressor and the opening of the compressor suction electronic expansion valve, and cannot achieve accurate control of the suction air dryness. Utility Model Content

[0009] A series of simplified concepts are introduced in the utility model content section, which are all simplifications of the prior art in the field, which will be further described in detail in the specific implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and necessary technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0010] The technical problem to be solved by the utility model is to provide a gas cooling refrigeration system suction dryness regulating device which can make the refrigerant liquid flow entering the compressor suction port reach the designed suction dryness.

[0011] In order to solve the above technical problems, the utility model provides a gas cooling refrigeration system suction air dryness adjustment device, comprising:

[0012] A condenser 1, whose liquid outlet is connected to the inlet of a first metering device 2, and whose air inlet is connected to the inlet of a first valve 3 and the outlet of a second metering device 4;

[0013] The first meter 2, whose outlet is connected to the inlet of the second valve 5, has a plurality of different set values ​​and a plurality of different electrical trigger signals pre-stored therein, each set value corresponds to an electrical trigger signal, and when the measured value reaches a certain set value, an electrical trigger signal corresponding to the set value is sent to the second valve 5;

[0014] A first valve 3, the outlet of which is connected to the inlet of a gas cooler 6;

[0015] A second metering device 4, the inlet of which is connected to the outlet of the oil separator 7;

[0016] The second valve 5, whose outlet is connected to the inlet of the gas cooler 6, has multiple openings stored in advance, each opening corresponds to an electric trigger signal, and performs different openings according to the received electric trigger signal;

[0017] A gas cooler 6, the outlet of which is connected to the inlet of the compressor 8 under test;

[0018] An oil-liquid separator 7, the inlet of which is connected to the outlet of the compressor 8 under test;

[0019] A first temperature and pressure measuring assembly 9, which is arranged at the outlet of the compressor 8 to be measured;

[0020] A second temperature and pressure measuring assembly 10, which is arranged at the outlet of the first meter 2;

[0021] A third temperature and pressure measuring assembly 11, which is arranged at the inlet of the first valve 3;

[0022] The fourth temperature and pressure measuring component 12 is arranged at the inlet of the compressor 8 under test.

[0023] Preferably, the gas cooling refrigeration system suction dryness adjustment device is further improved, and an insulation layer is coated on the inlet and outlet pipes of the gas cooler 6. The purpose of the insulation layer is to avoid energy loss, make the control of the adjustment device more accurate, and avoid inaccurate compressor testing caused by energy loss.

[0024] Preferably, the gas cooling refrigeration system suction air dryness adjustment device is further improved, and the first meter 2 is a liquid flow meter. The first meter 2 can be a vortex flow meter, a magnetic flow meter, or an ultrasonic flow meter.

[0025] Preferably, the gas cooling refrigeration system suction air dryness adjustment device is further improved.

[0026] The second meter 4 is a gas flow meter, and can be a vortex flow meter, a magnetic flow meter, or an ultrasonic flow meter.

[0027] Preferably, the gas cooling refrigeration system suction air dryness adjustment device is further improved, and the first valve 3 is a liquid circuit electronic expansion valve. It should be noted that the first valve 3 can also be a pressure control valve or a solenoid valve.

[0028] Preferably, the gas cooling refrigeration system suction air dryness adjustment device is further improved, and the second valve 5 is a gas circuit electronic expansion valve. It should be noted that the second valve 5 can also be a pressure control valve or a solenoid valve.

[0029] The working principle of the utility model is as follows;

[0030] The main principle of the utility model is based on the energy conservation principle on the gas cooler side. The setting value of the liquid flow meter triggers the corresponding electrical signal to control the opening of the liquid circuit expansion valve so that the refrigerant liquid flow entering the compressor suction port reaches the required suction dryness.

[0031] refer to Figure 1 As shown, according to the national standard GB / T 5773-2016 "Performance Test Methods for Volumetric Refrigerant Compressors", 5.1.4 Method D2-Exhaust Pipe Refrigerant Gas Flow Meter Method (X Method) and 5.1.7 Method J-Refrigerant Gas Cooling Method (Y Method), a set of compressor performance test system composed of these two methods is based on the gas cooling method, and a gas flow meter is added to the exhaust pipe.

[0032] When the compressor under test is running, the gas flow rate measured by the exhaust pipe flow meter is known to be F1, and the liquid flow rate measured by the gas cooling method liquid flow meter is F2, and the gas branch flow rate F3 can be obtained. The temperature, pressure and type of refrigerant in the system measured by the first temperature and pressure measuring components to the fourth temperature and pressure measuring components can be used to find the specific enthalpy corresponding to the compressor outlet temperature and pressure measuring point, the specific enthalpy corresponding to the liquid circuit expansion valve inlet temperature and pressure measuring point, the specific enthalpy corresponding to the gas circuit expansion valve inlet temperature and pressure measuring point, and the specific enthalpy corresponding to the compressor inlet temperature and pressure measuring point.

[0033] According to the energy conservation principle of the gas cooler, the set value of the liquid flow rate can be calculated and stored in the liquid flow meter. When the flow measured by the liquid flow meter reaches the set value, a trigger electrical signal is sent to the liquid circuit expansion valve. The liquid circuit expansion valve executes the pre-stored opening corresponding to the trigger electrical signal to achieve the set value of the liquid flow rate. At this time, the dryness of the compressor suction port is considered to be the set suction dryness.

[0034] To further realize the above-mentioned energy conservation principle, it is necessary to avoid energy loss as much as possible. The insulation layer of the gas cooler and the inlet and outlet pipes can effectively reduce energy loss, otherwise the heat leakage from the external environment will cause the deviation of the suction dryness. In addition, even if the insulation effect is good, it cannot guarantee that the entire gas cooler is in an adiabatic state. Therefore, the small heat leakage caused by the temperature difference between the external environment and the refrigerant in the gas cooler can be corrected according to the heat leakage calibration method specified in GB / T 5773-2016 "Performance Test Method of Volumetric Refrigerant Compressors".

[0035] Compared with the existing refrigeration system, the utility model has no change in cost and no increase in energy consumption, and can satisfy the requirements for obtaining parameters such as cooling capacity and power of the tested compressor under the specified suction air dryness, thereby enhancing the evaluation capability of the compressor from another perspective. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings of the present utility model are intended to illustrate the general characteristics of the methods, structures and / or materials used in specific exemplary embodiments of the present utility model, and to supplement the description in the specification. However, the drawings of the present utility model are schematic diagrams not drawn to scale, and thus may not accurately reflect the precise structure or performance characteristics of any given embodiment. The drawings of the present utility model should not be interpreted as limiting or restricting the range of values ​​or properties covered by the exemplary embodiments of the present utility model. The present utility model is further described in detail below in conjunction with the drawings and specific embodiments:

[0037] Figure 1 It is a schematic diagram of the structure of the utility model.

[0038] Description of Reference Numerals

[0039] Condenser 1

[0040] First meter 2

[0041] First valve 3

[0042] Second meter 4

[0043] Second valve 5

[0044] Gas Cooler 6

[0045] Oil separator 7

[0046] Compressor under test 8

[0047] First temperature and pressure measuring assembly 9

[0048] Second temperature and pressure measurement assembly 10

[0049] The third temperature and pressure measurement component 11

[0050] Fourth temperature and pressure measurement component 12. DETAILED DESCRIPTION

[0051] The following is an explanation of the implementation of the utility model by specific specific embodiments, and those skilled in the art can fully understand the other advantages and technical effects of the utility model from the content disclosed in this specification. The utility model can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the general design concept of the utility model. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. The following exemplary embodiments of the utility model can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described here. It should be understood that these embodiments are provided to make the disclosure of the utility model thorough and complete, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art. It should be understood that when an element is referred to as "connected" or "coupled" to another element, the element can be directly connected or coupled to another element, or there can be an intermediate element. The difference is that when an element is referred to as "directly connected" or "directly coupled" to another element, there is no intermediate element. In all the drawings, the same reference numerals always represent the same element.

[0052] Example

[0053] The utility model provides a device for adjusting the dryness of suction air in a gas cooling refrigeration system, comprising:

[0054] A condenser 1, whose liquid outlet is connected to the inlet of a first metering device 2, and whose air inlet is connected to the inlet of a first valve 3 and the outlet of a second metering device 4;

[0055] The first meter 2, whose outlet is connected to the inlet of the second valve 5, has a plurality of different set values ​​and a plurality of different electrical trigger signals pre-stored therein, each set value corresponds to an electrical trigger signal, and when the measured value reaches a certain set value, an electrical trigger signal corresponding to the set value is sent to the second valve 5;

[0056] A first valve 3, the outlet of which is connected to the inlet of a gas cooler 6;

[0057] A second metering device 4, the inlet of which is connected to the outlet of the oil separator 7;

[0058] The second valve 5, whose outlet is connected to the inlet of the gas cooler 6, has multiple openings stored in advance, each opening corresponds to an electric trigger signal, and performs different openings according to the received electric trigger signal;

[0059] A gas cooler 6, the outlet of which is connected to the inlet of the compressor 8 under test;

[0060] An oil-liquid separator 7, the inlet of which is connected to the outlet of the compressor 8 under test;

[0061] A first temperature and pressure measuring assembly 9, which is arranged at the outlet of the compressor 8 to be measured;

[0062] A second temperature and pressure measuring assembly 10, which is arranged at the outlet of the first meter 2;

[0063] A third temperature and pressure measuring assembly 11, which is arranged at the inlet of the first valve 3;

[0064] The fourth temperature and pressure measuring component 12 is arranged at the inlet of the compressor 8 under test.

[0065] Among them, the first meter 2 is a liquid flow meter, the second meter 4 is a gas flow meter, the first valve 3 is a liquid circuit electronic expansion valve, and the second valve 5 is a gas circuit electronic expansion valve.

[0066] Preferably, the above embodiment is further improved, and the inlet and outlet pipelines of the gas cooler 6 are coated with a thermal insulation layer.

[0067] In addition, it should be understood that, although the terms "first", "second", etc. can be used here to describe different elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the exemplary embodiments of the present utility model, the first element, component, region, layer or part discussed below may also be referred to as the second element, component, region, layer or part.

[0068] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. It will also be understood that, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field, and not interpreted in an ideal or overly formal sense.

[0069] The present invention is described in detail above through specific implementation methods and examples, but these do not constitute limitations of the present invention. Without departing from the principle of the present invention, those skilled in the art may make many modifications and improvements, which should also be considered as the protection scope of the present invention.

Claims

1. A device for adjusting the air dryness of a gas-cooled refrigeration system, characterized in that: include: A condenser (1), wherein a liquid outlet is connected to an inlet of a first metering device (2), and an air inlet is connected to an inlet of a first valve (3) and an outlet of a second metering device (4); A first meter (2), the outlet of which is connected to the inlet of the second valve (5), wherein a plurality of different set values ​​and a plurality of different electrical trigger signals are pre-stored, each set value corresponding to an electrical trigger signal, and when the measured value reaches a certain set value, an electrical trigger signal corresponding to the set value is sent to the second valve (5); A first valve (3), the outlet of which is connected to the inlet of a gas cooler (6); A second metering device (4), the inlet of which is connected to the outlet of the oil separator (7); A second valve (5), the outlet of which is connected to the inlet of the gas cooler (6), and the second valve (5) has a plurality of openings stored in advance, each opening corresponding to an electrical trigger signal, and the second valve (5) performs different openings according to the received electrical trigger signal; A gas cooler (6), the outlet of which is connected to the inlet of the compressor (8) under test; An oil-liquid separator (7), the inlet of which is connected to the outlet of the compressor (8) under test; A first temperature and pressure measuring assembly (9), which is arranged at the outlet of the compressor (8) to be measured; A second temperature and pressure measuring assembly (10) arranged at the outlet of the first meter (2); A third temperature and pressure measuring assembly (11), which is arranged at the inlet of the first valve (3); A fourth temperature and pressure measurement component (12) is arranged at the inlet of the compressor (8) to be measured.

2. The suction air dryness adjustment device for a gas cooling refrigeration system according to claim 1, characterized in that: The inlet and outlet pipelines of the gas cooler (6) are coated with a thermal insulation layer.

3. The suction air dryness adjustment device for a gas cooling refrigeration system according to claim 1, characterized in that: The first meter (2) is a liquid flow meter.

4. The suction air dryness adjustment device for a gas cooling refrigeration system according to claim 1, characterized in that: The second meter (4) is a gas flow meter.

5. The suction air dryness adjustment device for a gas cooling refrigeration system according to claim 1, characterized in that: The first valve (3) is a liquid circuit electronic expansion valve.

6. The suction air dryness adjustment device for a gas cooling refrigeration system according to claim 1, characterized in that: The second valve (5) is a gas circuit electronic expansion valve.

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