Return steam dryness control system of refrigerating system

Abstract

The utility model relates to the technical field of refrigerating systems, and provides a return steam dryness control system of a refrigerating system, which comprises a refrigerant liquid supply device used for providing refrigerant liquid; the control valve is arranged at the downstream of the refrigerant liquid supply device, and the control valve is used for controlling the flow of the refrigerant liquid; the evaporator is used for enabling the refrigerant liquid to absorb heat and be evaporated into refrigerant return steam, and the refrigerant return steam is gas or gas-liquid two-phase fluid; the return steam dryness measuring device is arranged at the downstream of the evaporator, and the return steam dryness measuring device is used for measuring the dryness of refrigerant return steam; and the return steam dryness measuring device is linked with the control valve. According to the return steam dryness control system of the refrigerating system, the return steam dryness is measured through the return steam dryness measuring device and fed back to the control valve so as to control the liquid supply amount of refrigerant liquid, control over the return steam dryness of the refrigerating system is achieved, the refrigerating effect is guaranteed, meanwhile, the proper liquid supply amount is provided, and energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration system technical field especially relates to a refrigeration system back steam dryness control system. BACKGROUND

[0002] The principle of the refrigeration system is mainly to utilize the heat absorption and heat release phenomenon in the state change process, and to realize the heat transfer from the low-temperature object to the high-temperature object through the circulation of the refrigerant, so as to achieve the purpose of refrigeration.

[0003] In the prior art, in order to ensure the refrigeration effect of the refrigeration system, an excessive amount of refrigerant liquid is usually provided, which results in high energy consumption, large refrigerant charging amount, and serious resource waste. INVENTION CONTENTS

[0004] The utility model provides a refrigeration system back steam dryness control system to solve the defect of excessive refrigerant liquid in the prior art, realize quantitative refrigerant liquid supply, and reduce energy consumption and refrigerant charging amount.

[0005] The utility model provides a refrigeration system back steam dryness control system, which comprises a refrigerant liquid supply device for providing refrigerant liquid.

[0006] A control valve is arranged downstream of the refrigerant liquid supply device, and the control valve is used to control the flow of the refrigerant liquid.

[0007] An evaporator is used to evaporate the refrigerant liquid into refrigerant back steam through heat absorption, wherein the refrigerant back steam is a gas or a gas-liquid two-phase fluid.

[0008] A back steam dryness measuring device is arranged downstream of the evaporator, and the back steam dryness measuring device is used to measure the dryness of the refrigerant back steam; and the back steam dryness measuring device is linked with the control valve.

[0009] According to the refrigeration system back steam dryness control system provided by the utility model, the refrigerant liquid supply device and the control valve are connected through a first pipeline; the control valve and the evaporator are connected through a second pipeline; and the back steam dryness measuring device is arranged on the outlet pipeline of the evaporator.

[0010] According to the refrigeration system back steam dryness control system provided by the utility model, the outlet pipeline of the evaporator is a conductor, which comprises a first straight pipe, an elbow pipe and a second straight pipe connected in sequence, and the back steam dryness measuring device comprises an impact type, and the back steam dryness measuring device is arranged at the elbow pipe.

[0011] According to the refrigeration system back vapor dryness control system, the outlet pipeline of the evaporator comprises a first straight pipe, an elbow pipe and a second straight pipe which are sequentially communicated, and the back vapor dryness measuring device comprises a jacket type, and the back vapor dryness measuring device is arranged at the second straight pipe.

[0012] According to the refrigeration system back vapor dryness control system, the second straight pipe is sleeved with an inner pipe, and the inner pipe and the second straight pipe are connected and supported through an insulator; and the gap between the inner pipe and the second straight pipe is communicated with the refrigerant back vapor.

[0013] According to the refrigeration system back vapor dryness control system, the first straight pipe, the elbow pipe and the second straight pipe are integrally connected.

[0014] The refrigeration system back vapor dryness control system provided by the utility model provides refrigerant liquid through the refrigerant liquid supply device, the control valve is arranged downstream of the refrigerant liquid supply device, the control valve controls the flow of the refrigerant liquid, the evaporator absorbs heat to evaporate the refrigerant liquid into refrigerant back vapor, the back vapor dryness measuring device is arranged downstream of the evaporator, the back vapor dryness measuring device measures the dryness of the refrigerant back vapor, and the back vapor dryness is fed back to the control valve to control the liquid supply amount of the refrigerant liquid, realizing the back vapor dryness control of the refrigeration system, providing appropriate liquid supply amount while ensuring the refrigeration effect, and reducing energy consumption and refrigerant charging amount. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor according to these drawings.

[0016] Figure 1 It is one of the refrigeration system back vapor dryness control system schematic view of the utility model embodiment.

[0017] Figure 2 It is Figure 1 It is the installation position schematic view of the back vapor dryness measuring device.

[0018] Figure 3 It is the second refrigeration system back vapor dryness control system schematic view of the utility model embodiment.

[0019] Figure 4 It is Figure 3 It is one of the installation position schematic view of the back vapor dryness measuring device.

[0020] Figure 5 It isFigure 3 Figure 2 is a schematic view of the installation position of the steam return dryness measurement device.

[0021] Reference signs:

[0022] 1, refrigerant supply device; 2, control valve; 3, evaporator; 4, steam return dryness measurement device; 5, first pipeline; 6, second pipeline; 7, outlet pipeline; 71, first straight pipe; 72, elbow; 73, second straight pipe; 74, inner pipe. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] The embodiments of the present application will be described below in combination with Figures 1-5 The refrigeration system steam return dryness control system of the present application is described.

[0026] As shown in Figure 1 The embodiments of the present application provide a refrigeration system steam return dryness control system, which comprises a refrigerant supply device 1, a control valve 2, an evaporator 3 and a steam return dryness measurement device 4.

[0027] The refrigerant liquid supply device 1 is used to supply refrigerant liquid; the refrigerant liquid is the basis of the refrigeration cycle, through which heat is absorbed and converted into gas, thereby achieving the refrigeration effect. The control valve 2 is arranged downstream of the refrigerant liquid supply device 1, and the control valve 2 is used to control the flow of the refrigerant liquid. By precisely controlling the flow, the refrigeration effect and efficiency in the evaporator can be further adjusted. The evaporator 3 supplies the refrigerant liquid to be heated and evaporated into refrigerant steam, wherein the refrigerant steam is in a gaseous or gas-liquid two-phase fluid state. The steam dryness measuring device 4 is arranged downstream of the evaporator 3, and the steam dryness measuring device 4 is used to measure the dryness of the refrigerant steam; the dryness refers to the proportion of the gas component in the refrigerant steam. The steam dryness measuring device 4 is linked with the control valve 2, and according to the measured dryness result, the opening of the control valve 2 can be adjusted in real time, so as to adjust the flow of the refrigerant liquid, and the quantitative liquid supply can be realized, so as to meet the refrigeration effect in the evaporator while ensuring low energy consumption and refrigerant charge.

[0028] It should be noted that the working process of the steam dryness measuring device 4 and the control valve 2 is that the measured value of the steam dryness measuring device 4 is transmitted to the controller in the form of an electrical signal, the controller performs signal conversion and operation, and then outputs an electrical signal to the control valve 2, so that the control valve 2 performs the operation of opening large, opening small or keeping unchanged, thereby realizing the linkage of the steam dryness measuring device 4 and the control valve 2.

[0029] According to different requirements and different types of refrigeration equipment, the specific structure of the evaporator 3 will also be different, and common evaporators include finned tube type evaporators, spiral tube type evaporators, plate type evaporators, honeycomb jacket type evaporators for biological products and wine fermentation tanks, and channel type jacket evaporators for biological products and wine fermentation tanks, and the specific structures of different types of evaporators can be referred to the prior art, and the embodiments of the present application will not be described in detail. In addition, the specific type of the evaporator can be selected according to actual needs, and the embodiments of the present application do not make specific limitations.

[0030] As shown in the figure, Figure 1 In a feasible embodiment of the present application, the refrigerant liquid supply device 1 and the control valve 2 are connected through the first pipeline 5, and the first pipeline 5 is used to transport the refrigerant liquid from the refrigerant liquid supply device 1 to the control valve 2. The control valve 2 and the evaporator 3 are connected through the second pipeline 6, and the second pipeline 6 ensures that the refrigerant liquid can stably and controllably enter the evaporator 3, so that the refrigerant liquid is in the evaporator 3; the steam dryness measuring device 4 is arranged on the outlet pipeline 7 of the evaporator 3, so that the steam dryness measuring device 4 can accurately measure the dryness of the refrigerant steam leaving the evaporator 3.

[0031] As shown in the figure, Figure 2As shown, in a feasible embodiment of this utility model, the outlet pipe of the evaporator 3 includes a first straight pipe 71, a bend 72, and a second straight pipe 73 connected in sequence, and the return steam dryness measuring device 4 is an impact type, and the return steam dryness measuring device 4 is located at the bend 72. Because the gas and liquid in the refrigerant return steam have different impact forces with the return steam dryness measuring device 4, the return steam dryness measuring device 4 outputs different capacitance values ​​based on the impact of the refrigerant return steam on the return steam dryness measuring device 4; the liquid content in the refrigerant return steam is obtained based on the change in capacitance value, thereby determining the return steam dryness. Typically, the first straight pipe 71, the bend 72, and the second straight pipe 73 are integrally connected.

[0032] In one feasible embodiment of this invention, the refrigerant is ammonia. Liquid ammonia has a high latent heat of vaporization, and can absorb a large amount of heat during evaporation, thereby achieving a highly efficient refrigeration effect. When ammonia is used as a refrigerant, its emissions and leaks can be controlled through appropriate safety measures and leak detection systems. Furthermore, compared with some halogenated hydrocarbon refrigerants, ammonia has a global warming potential (GWP) of 0, resulting in a smaller environmental impact.

[0033] In the above embodiments, when the return steam dryness measuring device 4 adopts an impact type, the refrigerant liquid can also be a fluid with a large difference between the gas phase density and the liquid phase density under other saturated states. The different impact forces of the gas and liquid in the refrigerant return steam on the return steam dryness measuring device 4 will cause the capacitance value of the return steam dryness measuring device 4 to change.

[0034] like Figure 3 As shown, in another feasible embodiment of this utility model, the outlet pipe of the evaporator 3 is a conductor, including a first straight pipe 71, a bend 72, and a second straight pipe 73 connected in sequence, and the return steam dryness measuring device 4 is a jacketed type, and the return steam dryness measuring device 4 is set at the second straight pipe 73; this not only ensures the smooth flow of refrigerant return steam in the pipe, but also facilitates the installation of monitoring equipment in a suitable location. The fluid dryness of the refrigerant return steam affects the capacitance value of the return steam dryness measuring device; the change in capacitance value is used to determine the liquid content in the refrigerant return steam, thereby determining the return steam dryness.

[0035] It should be noted that the return steam dryness measuring device can measure capacitance. Since the gas-liquid content ratio in the refrigerant return steam is different, the capacitance of the return steam dryness measuring device will also be different. By measuring the capacitance, the gas-liquid two-phase ratio, i.e., dryness, can be obtained.

[0036] In a feasible embodiment of the utility model, the refrigerant is carbon dioxide. In this embodiment, liquid carbon dioxide is delivered to the refrigerant liquid supply device 1 as refrigerant liquid, and enters the control valve 2 through the first pipeline. After flow regulation by the control valve 2, the liquid carbon dioxide enters the evaporator 3 to undergo the evaporation heat absorption process. The steam quality measurement device 4 arranged on the outlet pipeline 7 of the evaporator 3 can accurately measure the steam quality of the refrigerant, and adjust the opening of the control valve 2 in real time according to the measurement result, so as to ensure stable operation of the refrigeration system and high-efficiency refrigeration effect.

[0037] As shown in Figure 4 and Figure 5 In a feasible embodiment of the utility model, the second straight pipe 73 is sleeved with an inner pipe 74, and the inner pipe 74 and the second straight pipe 73 are connected and supported by an insulator (not shown in the figure); the gap between the inner pipe 74 and the second straight pipe 73 is in flow communication with the refrigerant steam. The presence of the insulator forms a capacitor between the second straight pipe 73 and the inner pipe 74. The gas-liquid content ratio of the gas-liquid two-phase flow between the double pipes is not the same, and the capacitance between the double pipes is also not the same. The gas-liquid two-phase ratio, i.e. the steam quality, can be obtained by measuring the capacitance.

[0038] It should be noted that the second straight pipe 73 and the inner pipe 74 are both conductors to form a capacitor.

[0039] In an embodiment of the utility model, the first straight pipe 71, the elbow pipe 72 and the second straight pipe 73 are integrally connected.

[0040] Therefore, the refrigeration system steam quality control system provided by the first aspect of the utility model has the advantages that after the refrigerant liquid passes through the control valve 2, the refrigerant liquid enters the evaporator 3 to be evaporated into refrigerant steam by absorbing heat in the evaporator 3. The refrigerant steam is usually a gas or a gas-liquid two-phase fluid. The steam quality of the refrigerant steam is measured by the steam quality measurement device 4, and the steam quality is fed back to the control valve 2. The control valve 2 controls the liquid supply amount of the refrigerant liquid supply device, realizes steam quality control of the refrigeration system, provides appropriate refrigerant liquid while ensuring normal operation of the refrigeration system, and reduces energy consumption and refrigerant charging amount.

[0041] In the description of the embodiments of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0042] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "aspects", "specific aspects", or "some aspects" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or aspect are included in at least one embodiment or aspect of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or aspect. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or aspects. In addition, those skilled in the art can combine and combine the different embodiments or aspects described in the present specification and the features of the different embodiments or aspects, without contradiction.

[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A refrigeration system suction superheat control system, comprising: The application relates to a refrigerant liquid supply device (1) for providing refrigerant liquid, a control valve (2) arranged downstream of the refrigerant liquid supply device (1), the control valve (2) being used for controlling the flow of refrigerant liquid, an evaporator (3) for evaporating the refrigerant liquid into refrigerant steam by absorbing heat, wherein the refrigerant steam is a gas or a gas-liquid two-phase fluid, a steam dryness measuring device (4) arranged downstream of the evaporator (3), the steam dryness measuring device (4) being used for measuring the dryness of the refrigerant steam, and the steam dryness measuring device (4) being linked with the control valve (2). The refrigerant liquid supply device (1) and the control valve (2) are connected through a first pipeline (5), the control valve (2) and the evaporator (3) are connected through a second pipeline (6), and the steam dryness measuring device (4) is arranged on an outlet pipeline (7) of the evaporator (3). The outlet pipeline (7) of the evaporator (3) comprises a first straight pipeline (71), an elbow (72) and a second straight pipeline (73) which are sequentially communicated, the steam dryness measuring device (4) is of an impact type, and the steam dryness measuring device (4) is arranged at the elbow (72). The outlet pipeline of the evaporator (3) is a conductor, comprises a first straight pipeline (71), an elbow (72) and a second straight pipeline (73) which are sequentially communicated, the steam dryness measuring device (4) is of a jacket type, and the steam dryness measuring device (4) is arranged at the second straight pipeline (73). The second straight pipeline (73) is sleeved with an inner pipeline (74), the inner pipeline (74) and the second straight pipeline (73) are connected and supported through an insulator, and the refrigerant steam flows through the gap between the inner pipeline (74) and the second straight pipeline (73).

2. The refrigeration system suction superheat control system according to claim 1, wherein, The first straight pipeline (71), the elbow (72) and the second straight pipeline (73) are integrally connected.

3. The refrigeration system suction superheat control system of claim 2 wherein, ​ 4. The refrigeration system suction superheat control system of claim 2 wherein, ​ 5. The refrigeration system suction superheat control system of claim 4 wherein, ​ 6. The refrigerant system quality control system of claim 3 wherein, ​

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