Refrigeration cycle system and water chiller

Abstract

The application provides a refrigeration cycle system and a water chiller, and the refrigeration cycle system comprises a refrigeration cycle pipeline and a bypass pipeline, wherein, in the direction from the outlet end to the inlet end of a compressor, a first heat exchanger, a throttling electronic valve and a second heat exchanger are sequentially arranged to form the refrigeration cycle pipeline; the bypass pipeline is arranged in parallel with the refrigeration cycle pipeline, and a mixing part is arranged on the bypass pipeline and is communicated with the outlet of the throttling electronic valve to introduce the low-temperature and low-pressure gas throttled by the throttling electronic valve into the bypass pipeline. The application solves the problem that the unloading pipeline of the screw water chiller in the prior art causes the high-temperature gas to pass through the suction port again to return to the compressor under the condition that the condensing temperature is high, the compressor fails due to high-temperature operation, and the normal operation of the compressor cannot be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a refrigeration cycle system and a water chiller. BACKGROUND

[0002] In the prior art, due to the cost or installation space limitation, a part of the screw water chiller units usually do not set the energy regulating mechanism of the compressor, when the screw water chiller unit needs to be unloaded, an unloading pipeline is usually set at the exhaust port and the suction port of the compressor, so as to achieve the purpose of controlling the unloading of the screw water chiller unit.

[0003] However, in the case of high condensing temperature, the current of the screw water chiller unit is relatively large, which leads to the relatively large heat generation of the compressor, at this time, the unloading through the unloading pipeline leads to the high exhaust temperature in the unloading pipeline, that is, the high-temperature gas discharged from the exhaust port is re-entered into the compressor through the suction port, which leads to the failure of the compressor due to high-temperature operation, and the normal operation of the compressor cannot be ensured. SUMMARY

[0004] The main purpose of the present application is to provide a refrigeration cycle system and a water chiller, so as to solve the problem that the unloading pipeline of the screw water chiller unit in the prior art re-enters the high-temperature gas into the compressor through the suction port in the case of high condensing temperature, which leads to the failure of the compressor due to high-temperature operation, and the normal operation of the compressor cannot be ensured.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a refrigeration cycle system is provided, which comprises a refrigeration cycle pipeline and a bypass pipeline, wherein, in the direction from the outlet end to the inlet end of the compressor, a first heat exchanger, a throttling electronic valve and a second heat exchanger are sequentially arranged to form the refrigeration cycle pipeline; the bypass pipeline is arranged in parallel with the refrigeration cycle pipeline, and a mixing part is arranged on the bypass pipeline, the mixing part is communicated with the outlet of the throttling electronic valve, so as to introduce the low-temperature and low-pressure gas throttled by the throttling electronic valve into the bypass pipeline.

[0006] Further, the refrigeration cycle system further comprises a communication pipeline, one end of the communication pipeline is communicated with the mixing part, and the other end of the communication pipeline is communicated with the outlet of the throttling electronic valve.

[0007] Further, the mixing part is an ejector, the high-pressure inlet of the ejector is communicated with the outlet end, the low-pressure inlet of the ejector is communicated with the outlet of the throttling electronic valve, and the ejecting outlet of the ejector is communicated with the inlet end.

[0008] Further, the refrigeration cycle system further comprises a bypass electronic valve, the bypass electronic valve is arranged on the bypass pipeline and is located downstream of the mixing part, and the bypass electronic valve is used for adjusting the flow of the refrigerant introduced into the bypass pipeline.

[0009] Further, the refrigeration cycle system further comprises a pressure sensor, a comparison module and a control module, wherein the pressure sensor is arranged on the refrigeration cycle pipeline, and the pressure sensor is used for monitoring the condensing pressure Ps on the refrigeration cycle pipeline; the comparison module compares the condensing pressure Ps with a preset condensing pressure P and obtains comparison information; the control module is in signal connection with the comparison module, and the control module is in control connection with the bypass electronic valve, so as to adjust the opening and closing and the opening degree of the bypass electronic valve according to the comparison information.

[0010] Further, the pressure sensor is located between the outlet end and the first heat exchanger.

[0011] Further, the preset condensing pressure P comprises a first preset pressure P1, the first preset pressure P1 is the maximum condensing pressure value of the refrigeration cycle pipeline under the normal operation condition, and when the comparison information is Ps < P1, the refrigeration cycle pipeline is in normal operation, and the bypass electronic valve is in the closed state.

[0012] Further, the preset condensing pressure P further comprises a second preset pressure P2, the second preset pressure P2 is the condensing pressure value when the refrigeration cycle system starts to unload, and P2 > P1, and when the comparison information is P1 < Ps < P2, the bypass electronic valve is in the closed state.

[0013] Further, the preset condensing pressure P further comprises a third preset pressure P3, the third preset pressure P3 is the condensing pressure value when the refrigeration cycle system is in the unloading state, and P3 > P2, and when the comparison information is P2 < Ps < P3, the bypass electronic valve is in the open state.

[0014] Further, when the comparison information is Ps > P3, the opening degree of the bypass electronic valve is opened to the maximum.

[0015] Further, the compressor is a two-stage screw compressor.

[0016] Further, the first heat exchanger is a condenser.

[0017] Further, the second heat exchanger is an evaporator.

[0018] According to another aspect of the present application, a water chiller is provided, comprising a refrigeration cycle system, and the refrigeration cycle system is the above refrigeration cycle system.

[0019] By arranging the mixing part on the bypass pipeline of the refrigeration cycle system, and simultaneously, the mixing part is in communication with the outlet of the throttling electronic valve, so that the mixing part can introduce the low-temperature and low-pressure gas throttled by the throttling electronic valve into the bypass pipeline, so that the low-temperature and low-pressure gas is mixed with the high-temperature and high-pressure gas on the bypass pipeline, and the temperature of the mixed gas is greatly reduced, so as to ensure that the temperature of the gas entering the compressor is not too high, and the working reliability of the compressor is ensured. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of a refrigeration cycle system according to an optional embodiment of the present invention is shown.

[0022] The above figures include the following reference numerals:

[0023] 1. Refrigeration circulation piping; 2. Bypass piping; 3. Connecting piping;

[0024] 10. Compressor; 20. First heat exchanger; 30. Throttling electronic valve; 40. Second heat exchanger; 50. Mixing section; 60. Bypass electronic valve; 70. Pressure sensor. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] To address the problem in existing screw chiller units where the unloading pipeline returns high-temperature gas back to the compressor through the suction port at high condensing temperatures, causing compressor malfunctions due to high-temperature operation and compromising normal compressor operation, this invention provides a refrigeration cycle system and a chiller, wherein the chiller includes a refrigeration cycle system, which is the refrigeration cycle system described above and below.

[0027] like Figure 1 As shown, the refrigeration cycle system includes a refrigeration cycle pipeline 1 and a bypass pipeline 2. A first heat exchanger 20, a throttling electronic valve 30, and a second heat exchanger 40 are sequentially arranged in the direction from the outlet end to the inlet end of the compressor 10 to form the refrigeration cycle pipeline 1. The bypass pipeline 2 is arranged in parallel with the refrigeration cycle pipeline 1, and a mixing section 50 is provided on the bypass pipeline 2. The mixing section 50 is connected to the outlet of the throttling electronic valve 30 to introduce the low-temperature, low-pressure gas after throttling by the throttling electronic valve 30 into the bypass pipeline 2.

[0028] The mixing part 50 is communicated with the outlet of the throttling electronic valve 30, so that the mixing part 50 can introduce the low-temperature and low-pressure gas throttled by the throttling electronic valve 30 into the bypass pipeline 2, so that the low-temperature and low-pressure gas is mixed with the high-temperature and high-pressure gas in the bypass pipeline 2, and the temperature of the mixed gas is greatly reduced, so that the temperature of the gas entering the compressor 10 is not too high, and the working reliability of the compressor 10 is ensured.

[0029] As shown in Figure 1 The refrigeration cycle system further comprises a communication pipeline 3, one end of the communication pipeline 3 is communicated with the mixing part 50, and the other end of the communication pipeline 3 is communicated with the outlet of the throttling electronic valve 30. In this way, the communication pipeline 3 serves to communicate the mixing part 50 and the outlet of the throttling electronic valve 30, and ensures the communication reliability therebetween.

[0030] It should be noted that in the present application, the mixing part 50 is an ejector, the high-pressure inlet of the ejector is communicated with the outlet end, the low-pressure inlet of the ejector is communicated with the outlet of the throttling electronic valve 30, and the injection outlet of the ejector is communicated with the inlet end.

[0031] It should be noted that in the present application, the injection flow rate at the low-pressure inlet increases with the increase of the flow rate at the high-pressure inlet.

[0032] As shown in Figure 1 The refrigeration cycle system further comprises a bypass electronic valve 60, which is located on the bypass pipeline 2 and downstream of the mixing part 50, and is used to adjust the flow rate of the refrigerant introduced into the bypass pipeline 2. In this way, the bypass electronic valve 60 serves to open the bypass pipeline 2, close the bypass pipeline 2, and adjust the flow rate of the refrigerant in the bypass pipeline 2.

[0033] Optionally, the bypass electronic valve 60 is an electronic expansion valve.

[0034] It should be noted that in the present application, the refrigeration cycle system further comprises a pressure sensor 70, a comparison module and a control module, wherein the pressure sensor 70 is arranged on the refrigeration cycle pipeline 1 and is used to monitor the condensing pressure Ps on the refrigeration cycle pipeline 1; the comparison module compares the condensing pressure Ps with a preset condensing pressure P and obtains comparison information; the control module is signal-connected with the comparison module, and the control module is control-connected with the bypass electronic valve 60, so as to adjust the opening and closing and the opening degree of the bypass electronic valve 60 according to the comparison information. In this way, the pressure sensor 70 is used to monitor the condensing pressure Ps on the refrigeration cycle pipeline 1, the comparison module is used to compare the condensing pressure Ps with the preset condensing pressure P and obtain comparison information, and the control module can adjust the opening and closing and the opening degree of the bypass electronic valve 60 according to the comparison information.

[0035] Specifically, the preset condensing pressure P includes a first preset pressure P1, and the first preset pressure P1 is a maximum condensing pressure value of the refrigeration cycle pipeline 1 under a normal operating condition. When the comparison information is Ps

[0036] Optionally, the preset condensing pressure P further includes a second preset pressure P2, the second preset pressure P2 is a condensing pressure value when the refrigeration cycle system starts to unload, and P2>P1. When the comparison information is P1

[0037] Optionally, the preset condensing pressure P further includes a third preset pressure P3, the third preset pressure P3 is a condensing pressure value when the refrigeration cycle system is in an unloading state, and P3>P2. When the comparison information is P2

[0038] It should be noted that in the present application, when the comparison information is Ps>P3, the opening degree of the bypass electronic valve 60 is opened to the maximum.

[0039] Further, the pressure sensor 70 is located between the outlet end and the first heat exchanger 20. In this way, the monitoring reliability of the pressure sensor 70 on the condensing pressure Ps on the refrigeration cycle pipeline 1 is ensured.

[0040] Optionally, the compressor 10 is a two-stage screw compressor.

[0041] Optionally, the first heat exchanger 20 is a condenser.

[0042] Optionally, the second heat exchanger 40 is an evaporator.

[0043] It should be noted that in the present application, in addition to the logic of the real-time monitoring of the condensing temperature of the refrigeration machine to achieve automatic unloading, if the user requires a refrigeration capacity less than the rated refrigeration capacity at this time, the opening degree of the bypass electronic valve 60 can be manually adjusted to achieve the unloading requirement.

[0044] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0045] The foregoing is a summary and thus contains only the most basic embodiment. The application is not to be limited to the embodiments disclosed in this summary. Numerous other embodiments of the application will be disclosed and appreciated hereinafter. The above summary of the present application is not intended to describe each illustrated embodiment or every implementation of the present application. The description that follows, including the detailed description and the claims by themselves, will provide further information about the nature and merits of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, figures, and other references mentioned herein are expressly incorporated by reference in their entirety to the same extent as if each were incorporated by reference individually. In addition, as used herein, "exemplary" or "illustrative" means "serving as an example, instance, or illustration," and should not be construed as preferred or advantageous over other embodiments.

[0046] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "vertical", "horizontal", "top", "bottom", and derivatives thereof shall relate to the application as it is oriented in use. The terms "antecedent" and "consequent" are used herein to describe orders of operations as they will be performed when the respective processes are executed. Unless otherwise noted, the word "about" preceding a value means ±10% of the value. Unless otherwise noted, the word "substantially" preceding a value means ±5% of the value. Unless otherwise specified the only limitation on the values recited for a given variable is that the numerical range is inclusive of the recited limits. Unless otherwise clear from context, as used herein, the indefinite article "a" is intended to mean one or more than one; the indefinite article "an" is intended to mean one, unless otherwise explicitly provided herein. The indefinite article "the" is intended to refer to a previously recited element as well as to any elements that are introduced after the respective article "the". The words "program" or "software" refer to any set of instructions designed to cause a processor to perform particular operations. The terms "data store", "data storage", "database", and substantially any other expression of storage space that is able to store data are used herein to refer to any hardware or a combination of hardware and software that provides for mass storage of information, such as computer-readable medium / media, and / or databases. Computer-readable media can include any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired computer-readable code in the form of computer- readable instructions or data structures and that can be accessed by a computer. Computer-readable media also can be any available medium or media that can be accessed by a computer.

[0047] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0048] It should be noted that, as used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly dictates otherwise. Thus, for example, reference to "a component" includes a combination of two or more components, and the like. It should also be noted that, as used in this specification and the appended claims, the term "or" is generally employed in its sense of "and / or" unless the content clearly dictates otherwise.

[0049] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A refrigeration cycle system characterized by, include: In the refrigeration circulation pipeline (1), a first heat exchanger (20), a throttling electronic valve (30), and a second heat exchanger (40) are sequentially arranged in the direction from the outlet end to the inlet end of the compressor (10) to form the refrigeration circulation pipeline (1). A bypass pipe (2) is provided in parallel with the refrigeration cycle pipe (1), and a mixing section (50) is provided on the bypass pipe (2). The mixing section (50) is connected to the outlet of the throttling electronic valve (30) so as to introduce the low temperature and low pressure gas after being throttled by the throttling electronic valve (30) into the bypass pipe (2). The refrigeration cycle system also includes: A bypass electronic valve (60) is located on the bypass line (2) and downstream of the mixing section (50). The bypass electronic valve (60) is used to regulate the flow rate of the refrigerant introduced into the bypass line (2). Pressure sensor (70) is installed on the refrigeration cycle line (1) and is used to monitor the condensing pressure Ps on the refrigeration cycle line (1); The comparison module compares the condensing pressure Ps with the preset condensing pressure P and obtains comparison information. A control module is connected to the comparison module by signal and is also connected to the bypass electronic valve (60) by control, so as to adjust the opening and closing and the opening degree of the bypass electronic valve (60) according to the comparison information; The mixing section (50) is an ejector, and the high-pressure inlet of the ejector is connected to the outlet end, the low-pressure inlet of the ejector is connected to the outlet of the throttling electronic valve (30), and the ejection outlet of the ejector is connected to the inlet end.

2. The refrigeration cycle system according to claim 1, characterized by, The refrigeration cycle system also includes: A connecting pipe (3) is provided, one end of which is connected to the mixing section (50), and the other end of which is connected to the outlet of the throttling electronic valve (30).

3. The refrigeration cycle system according to claim 1, characterized by, The pressure sensor (70) is located between the outlet end and the first heat exchanger (20).

4. The refrigeration cycle system according to claim 1, characterized by, The preset condensing pressure P includes a first preset pressure P1, which is the maximum condensing pressure value of the refrigeration cycle pipeline (1) under normal operating conditions. When the comparison information is Ps < P1, the refrigeration cycle pipeline (1) is operating normally and the bypass electronic valve (60) is in the closed state.

5. The refrigeration cycle system according to claim 4, characterized by The preset condensing pressure P also includes a second preset pressure P2, which is the condensing pressure value when the refrigeration cycle system starts unloading, and P2 > P1. When the comparison information is P1 < Ps < P2, the bypass electronic valve (60) is in the closed state.

6. The refrigeration cycle system according to claim 5, characterized by The preset condensing pressure P also includes a third preset pressure P3, which is the condensing pressure value of the refrigeration cycle system in the unloading state, and P3 > P2. When the comparison information is P2 < Ps < P3, the bypass electronic valve (60) is in the open state.

7. The refrigeration cycle system according to claim 6, characterized by When the comparison information is Ps > P3, the bypass electronic valve (60) is opened to its maximum.

8. The refrigeration cycle system according to any one of claims 1 to 7, characterized in that, The compressor (10) is a two-stage screw compressor.

9. The refrigeration cycle system according to any one of claims 1 to 7, characterized in that, The first heat exchanger (20) is a condenser.

10. The refrigeration cycle system according to any one of claims 1 to 7, characterized in that, The second heat exchanger (40) is an evaporator.

11. A chiller, characterized in that, It includes a refrigeration cycle system, wherein the refrigeration cycle system is the refrigeration cycle system according to any one of claims 1 to 10.

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