Water chilling unit capable of refrigerating all year round

Abstract

The water chilling unit comprises a compressor, a throttling element, a condenser, a bypass flow path, a switch piece and a temperature sensor, an outlet of the compressor communicates with an inlet of the throttling element to form a high-pressure flow path, the condenser is arranged on the high-pressure flow path, the switch piece is arranged on the bypass flow path, and the temperature sensor is arranged on the bypass flow path. The two ends of the bypass flow path communicate with the high-pressure flow path correspondingly and are connected with the condenser in parallel. The temperature sensor is used for detecting the current environment temperature t1, and in the start-up process of the water chilling unit capable of conducting refrigeration all the year round, the switch piece can respond to a current environment temperature t1 signal measured by the temperature sensor to enable the bypass flow path to be connected or disconnected. The year-round refrigeration water chilling unit solves the problem that low-pressure protection is easily triggered due to the fact that the condensation temperature is too low in the starting process.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a chiller for year-round refrigeration. Background Art

[0002] The working process of a traditional chiller is usually as follows: the compressor sucks in low-temperature, low-pressure refrigerant vapor from the evaporator and compresses it to do work, turning it into high-temperature, high-pressure superheated vapor. Then, the high-temperature, high-pressure refrigerant vapor enters the condenser to exchange heat with the ambient air at a lower temperature, and the refrigerant condenses into a high-pressure liquid. The high-pressure liquid is throttled and decompressed by the throttling device to become a low-temperature, low-pressure, and liquid-rich gas-liquid two-phase mixture. These gas-liquid two-phase mixtures enter the evaporator, absorb the heat of the chilled water in the evaporator, and become low-temperature, low-pressure refrigerant vapor. The refrigerant vapor is sucked into the compressor again, and the cycle repeats.

[0003] Among them, the loop part between the compressor outlet and the throttling device is the high-pressure side of the chiller. During the startup of the chiller, a stable refrigerant circulation loop is not established inside the chiller. At this time, the condensation temperature of the refrigerant in the condenser depends on the current external ambient temperature. When the external ambient temperature is relatively low in winter, the condensation temperature of the refrigerant at the condenser is relatively low. Too low condensation temperature can easily trigger low pressure protection. Utility Model Content

[0004] Based on this, it is necessary to provide a chiller with year-round cooling to solve the problem that the condensing temperature is too low during the startup process, which easily triggers the low-pressure protection.

[0005] A chiller with year-round cooling, the chiller comprising a compressor, a throttling element, a condenser, a bypass flow path, a switch element and a temperature sensor, the compressor outlet is connected with the throttling element inlet to form a high-pressure flow path, the condenser is arranged on the high-pressure flow path, the switch element is arranged on the bypass flow path, the two ends of the bypass flow path are respectively connected to the high-pressure flow path and are arranged in parallel with the condenser; the temperature sensor is used to detect the current ambient temperature t1, during the startup process of the chiller with year-round cooling, the switch element can respond to the current ambient temperature t1 signal measured by the temperature sensor to connect or disconnect the bypass flow path.

[0006] In one of the embodiments, during the startup process of the chiller for year-round cooling, the switch element is configured to be opened in response to the current ambient temperature t1 being less than the preset ambient temperature value T1, so that the bypass flow path is connected; and the switch element is configured to be closed in response to the current ambient temperature t1 being greater than the preset ambient temperature value T1, so that the bypass flow path is isolated.

[0007] In one embodiment, the chiller for year-round cooling further includes an evaporator, which is connected in series between the compressor inlet and the outlet of the throttling element.

[0008] In one embodiment, the critical temperature at which the refrigerant changes from liquid to gas in the evaporator is defined as the evaporation temperature T e , the saturation temperature of the refrigerant when it condenses in the condenser is defined as the condensation temperature T c During year-round cooling operation of the chiller, the switch is configured to respond to the evaporation temperature T e is lower than the first protection temperature T2, and the condensation temperature T c It is understood that in this way, the bypass flow path can directly flow part of the high-temperature and high-pressure refrigerant vapor flowing out of the compressor to the position close to the throttling element as heat and pressure supplement, so as to quickly reduce the evaporation temperature Te and the condensation temperature T c Raised to normal level.

[0009] In one embodiment, during the operation of the chiller for year-round cooling, the switch element is configured to respond to the evaporation temperature T e The switch is configured to be able to respond to the condensation temperature T c The bypass flow path is closed when the temperature is greater than the second protection temperature T3 and lasts for a preset time t, so that the bypass flow path is isolated. It can be understood that such a setting enables the refrigerant to return to normal flow through the condenser after a stable cycle is established in the chiller for year-round cooling. In addition, by limiting the preset time t, the evaporation temperature T e Short-term fluctuations greater than the first protection temperature T2, and excluding the condensation temperature T c The short-term fluctuation is greater than the second protection temperature T3.

[0010] In one embodiment, the switch element is configured as a solenoid valve. It can be understood that such a configuration can quickly cut off or connect the bypass flow path.

[0011] In one embodiment, the chiller for year-round cooling further includes a controller, a first pressure sensor, and a second pressure sensor, wherein the first pressure sensor is used to detect the evaporation pressure when the chiller for year-round cooling is in operation. The second pressure sensor is used to detect the condensation pressure when the chiller for year-round cooling is in operation. The temperature sensor, the solenoid valve, the first pressure sensor, and the second pressure sensor are respectively connected to the controller, and the controller can control the switch to open or close according to the current ambient temperature t1, the evaporation pressure, and the condensation pressure.

[0012] In one embodiment, a heat recovery device is also provided on the high-pressure flow path, and the heat recovery device has a refrigerant flow path and a hot water flow path. The refrigerant flow path is connected in series between the compressor and the condenser, and the hot water flow path is used to circulate heat recovery water. One end of the bypass flow path is connected to the refrigerant flow path of the heat recovery device. It can be understood that such a configuration can not only make full use of the heat of the refrigerant, but also the heat recovery water in the heat recovery device can preliminarily condense the refrigerant before entering the condenser, thereby facilitating the supercooling of the refrigerant.

[0013] In one embodiment, a liquid accumulator is also provided on the high-pressure flow path, and the liquid accumulator is connected in series between the condenser and the throttling element. One end of the bypass flow path is connected to the refrigerant flow path, and the other end is connected to the liquid accumulator. It can be understood that, in this arrangement, when the bypass flow path is connected, the refrigerant in the heat recovery device can directly flow into the liquid accumulator through the bypass flow path.

[0014] In one embodiment, the condenser is configured as an air-cooled condenser and installed outdoors, and the condenser includes at least one fan unit, each fan unit includes at least one fixed-frequency fan and at least one variable-frequency fan. It can be understood that such a configuration is convenient for adjusting the fan speed according to the condensation requirements of different seasons, thereby adjusting the wind speed, which is conducive to avoiding energy waste.

[0015] During the startup process, a stable refrigerant circulation circuit is not established inside the chiller for year-round cooling. At this time, the condensation temperature of the refrigerant in the condenser depends on the current ambient temperature t1 when the machine is started. When the external ambient temperature is relatively low in winter, the condensation temperature of the refrigerant at the condenser is relatively low, and too low a condensation temperature will trigger low-pressure protection. In the present application, when the current ambient temperature t1 is relatively low, the switch component responds to the temperature sensor and opens, and the bypass flow path is connected. The high-temperature and high-pressure refrigerant vapor flowing out of the compressor outlet can be divided into two branches, one of which passes through the condenser and then flows to the throttling element; the other branch flows directly to the throttling element through the bypass flow path. The high-temperature and high-pressure refrigerant vapor in this branch does not flow through the condenser, and therefore does not need to participate in condensation and cooling, and the flow path is shorter, so it can quickly flow to the throttling element, thereby enabling a high-pressure environment to be quickly established between the compressor outlet and the throttling element inlet, and increasing the condensation temperature, thereby avoiding triggering low-pressure protection during the startup process, so that the chiller for year-round cooling can be started smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 System schematic diagram of a chiller for year-round cooling provided for this application.

[0018] Figure numerals: 10, compressor; 20, throttling element; 30, high-pressure flow path; 31, condenser; 32, heat recovery device; 33, liquid storage device; 40, low-pressure flow path; 41, evaporator; 50, bypass flow path; 60, switch; 71, first pressure sensor; 72, second pressure sensor. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0020] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0024] See also Figure 1 The present application provides a chiller for year-round refrigeration, which includes a compressor 10, a throttling element 20, a condenser 31, a bypass flow path 50, a switch 60, and a temperature sensor. The outlet of the compressor 10 is connected to the inlet of the throttling element 20 to form a high-pressure flow path 30, and the outlet of the throttling element 20 is connected to the inlet of the compressor 10 to form a low-pressure flow path 40. The condenser 31 is arranged on the high-pressure flow path 30, and the switch 60 is arranged on the bypass flow path 50. The two ends of the bypass flow path 50 are respectively connected to the high-pressure flow path 30 and are arranged in parallel with the condenser 31; the temperature sensor is used to detect the current ambient temperature t1. During the startup process of the chiller for year-round refrigeration, the switch 60 can respond to the current ambient temperature t1 signal measured by the temperature sensor to connect or disconnect the bypass flow path 50.

[0025] During the startup of the chiller for year-round cooling, a stable refrigerant circulation loop is not established inside the chiller for year-round cooling. At this time, the condensation temperature of the refrigerant in the condenser 31 depends on the current ambient temperature t1 when the chiller is started. Therefore, when the external ambient temperature is relatively low in winter, the condensation temperature of the refrigerant at the condenser 31 is also relatively low, and a too low condensation temperature will trigger low-pressure protection. In the present application, when the temperature sensor detects that the current ambient temperature t1 is relatively low, the switch 60 responds to the temperature sensor to open, the bypass flow path 50 is connected, and the high-temperature high-pressure gas flowing out of the compressor outlet is turned on. The high-pressure refrigerant vapor can be divided into two branches, one of which flows to the throttling element 20 after passing through the condenser 31, and the other branch flows to the throttling element 20 directly through the bypass flow path 50. The high-temperature and high-pressure refrigerant vapor in this branch does not flow through the condenser 31, and thus does not need to participate in condensation and cooling, and the flow path is shorter, so it can flow quickly to the throttling element 20, thereby quickly establishing a high-pressure environment between the compressor outlet and the throttling element inlet, and increasing the condensing temperature, thereby avoiding triggering low-pressure protection during the startup process, so that the chiller for year-round cooling can be started smoothly.

[0026] The throttling element 20 may be configured as a throttling expansion valve.

[0027] During the startup process of the chiller for year-round cooling, the switch element 60 is configured to be opened in response to the current ambient temperature t1 being less than the preset ambient temperature value T1, so that the bypass flow path 50 is connected; and the switch element 60 is configured to be closed in response to the current ambient temperature t1 being greater than the preset ambient temperature value T1, so that the bypass flow path 50 is blocked.

[0028] T1 is the ambient temperature value corresponding to the lower limit of the condensing temperature for the smooth startup of the chiller throughout the year. If the current ambient temperature t1 is less than the preset temperature value T1, it means that the condensing temperature is lower than the lower limit at this time. At this time, the bypass flow path 50 is connected with the high-pressure flow path 30, so that part of the refrigerant can bypass the condenser 31 through the bypass flow path 50 and flow to the throttling element 20, so that a high-pressure environment can be quickly established and the condensing temperature can be increased, thereby avoiding the triggering of low-pressure protection during the startup process. If the ambient temperature t1 is greater than the preset temperature value T1, it means that the condensing temperature exceeds the lower limit at this time, the bypass flow path 50 is cut off, and the refrigerant can flow normally through the condenser 31 and can also start smoothly.

[0029] When the chiller is turned on for year-round cooling, the lower limit of the refrigerant condensation temperature is usually around 30°C, and the condensation temperature is equal to the ambient temperature t1 plus 10-20°C. Therefore, the ambient temperature corresponding to the lower limit of the condensation temperature, that is, the preset temperature value T1, is generally 15°C.

[0030] An evaporator 41 is provided on the low-pressure flow path 40, and the evaporator 41 is connected in series between the inlet of the compressor 10 and the outlet of the throttling element 20. After the refrigerant is throttled and depressurized by the throttling element 20, it becomes a gas-liquid two-phase mixture with a low temperature and low pressure and a high liquid content. These gas-liquid two-phase mixtures enter the evaporator 41 and exchange heat with the relatively high temperature chilled water. After the refrigerant liquid absorbs the heat of the chilled water, it gasifies and becomes a low-temperature and low-pressure refrigerant vapor, thereby reducing the temperature of the chilled water to achieve the purpose of refrigeration. The gasified refrigerant vapor will be sucked into the compressor.

[0031] The critical temperature at which the refrigerant changes from liquid to gas in the evaporator 41 is defined as the evaporation temperature T e , the saturation temperature of the refrigerant when condensing in the condenser 31 is defined as the condensation temperature T c During the operation of the chiller for year-round cooling, the switch 60 is configured to respond to the evaporation temperature T e is lower than the first protection temperature T2, and the condensation temperature T c The bypass flow path 50 is opened when the temperature is lower than the second protection temperature T3.

[0032] The evaporation temperature Te and the condensation temperature Tc are usually used to determine the working state of the refrigerant and the system performance. During the operation of the chiller for year-round cooling, if the evaporation temperature Te and the condensation temperature Tc of the refrigerant are both too low, the chiller for year-round cooling cannot operate stably. In this embodiment, by setting the evaporation temperature Te e is lower than the first protection temperature T2, and the condensation temperature T c When the temperature is lower than the second protection temperature T3, the bypass flow path 50 is connected to the high-pressure flow path 30, so that the bypass flow path 50 can quickly flow part of the high-temperature and high-pressure refrigerant vapor flowing out of the compressor 10 to the throttling element 20 and the evaporator 41 as heat supplement, so as to quickly restore the evaporation temperature Te and the condensation temperature Tc to normal levels.

[0033] The first protection temperature T2 may be the low evaporation temperature protection temperature of the chiller + 3°C, and the second protection temperature T3 may be set to 30°C.

[0034] Furthermore, during the operation of the chiller, the switch 60 is configured to respond to the evaporation temperature T e The switch 60 is configured to be able to respond to the condensation temperature T c The temperature is greater than the second protection temperature T3 and lasts for a preset time t to be closed, so that the bypass flow path 50 is isolated.

[0035] During the operation of the chiller for year-round cooling, when the evaporation temperature T eWhen the condensation temperature T c When the temperature is greater than the second protection temperature T3 and lasts for a preset time t, it indicates that a stable cycle has been established in the chiller for year-round cooling. At this time, the bypass flow path 50 is cut off, and the refrigerant flows normally through the condenser 31, which can also enable the year-round cooling chiller to operate normally. e Short-term fluctuations greater than the first protection temperature T2, and excluding the condensation temperature T c The short-term fluctuation is greater than the second protection temperature T3. Specifically, the value of the preset time t can be 10 seconds.

[0036] The switch 60 is arranged on the bypass flow path 50 and is configured as a solenoid valve. When the solenoid valve is closed, the bypass flow path 50 is blocked; when the solenoid valve is opened, the bypass flow path 50 is connected to the high-pressure flow path 30. By providing the solenoid valve, the bypass flow path 50 can be quickly blocked or connected.

[0037] The chiller for year-round cooling also includes a controller, a first pressure sensor 71 and a second pressure sensor 72. The first pressure sensor 71 is used to detect the evaporation pressure when the chiller for year-round cooling is in operation. The second pressure sensor 72 is used to detect the condensation pressure when the chiller for year-round cooling is in operation. The temperature sensor, the solenoid valve, the first pressure sensor 71 and the second pressure sensor 72 are connected to the controller respectively, and the controller can control the switch 60 to open or close according to the current ambient temperature t1, the evaporation pressure and the condensation pressure.

[0038] When the chiller is running for year-round cooling, the evaporation temperature of the refrigerant is T e and condensation temperature T c It is difficult to measure directly and accurately, and because the evaporation temperature T e Evaporation pressure is proportional to condensation temperature T c is proportional to the condensation pressure. Therefore, in this embodiment, the evaporation temperature T can be obtained by detecting the evaporation pressure through the first pressure sensor 71. e Similarly, the condensation pressure can be detected by the second pressure sensor 72 to obtain the condensation temperature T c .

[0039] Specifically, the controller controls the solenoid valve switch as follows: during the start-up of the chiller, if the temperature sensor measures that the ambient temperature t1 is less than the preset temperature value T1, the controller controls the solenoid valve to open; if the temperature sensor measures that the ambient temperature t1 is greater than the preset temperature value T1, the controller controls the solenoid valve to close. During the operation of the chiller, the controller calculates the condensing temperature T according to the condensing pressure. c , and calculate the evaporation temperature T according to the evaporation pressure eAnd, when the evaporation temperature T e is lower than the first protection temperature T2, and the condensation temperature T c When the evaporation temperature is lower than the second protection temperature T3, the controller controls the solenoid valve to open; when the evaporation temperature T e is greater than the first protection temperature T2 and lasts for a preset time t, or the condensation temperature T c When the temperature is greater than the second protection temperature T3 and lasts for a preset time t, the solenoid valve is closed.

[0040] A heat recovery device 32 is also provided on the high-pressure flow path 30. The heat recovery device 32 has a refrigerant flow path and a hot water flow path. The refrigerant flow path is connected in series between the compressor 10 and the condenser 31, and the hot water flow path is used to circulate the heat recovery water. In this way, the high-temperature and high-pressure refrigerant vapor discharged from the compressor first enters the refrigerant flow path of the heat recovery device 32, and heats the heat recovery water in the hot water flow path. In this way, not only can the heat of the refrigerant be fully utilized, but also the heat recovery water in the heat recovery device 32 can preliminarily condense the refrigerant before entering the condenser 31, which is conducive to ensuring the supercooling of the refrigerant.

[0041] A liquid accumulator 33 is also provided on the high-pressure flow path 30, and the liquid accumulator 33 is connected in series between the condenser 31 and the throttling element 20. The water chiller for year-round cooling provided by the present application requires different amounts of refrigerant in winter and summer. By providing the liquid accumulator 33, the liquid accumulator 33 can store refrigerant, thereby balancing the amount of refrigerant in the water chiller for year-round cooling in different seasons.

[0042] In one embodiment, one end of the bypass flow path 50 is connected to the refrigerant flow path of the heat recovery device 32 , and the other end is connected to the accumulator 33 .

[0043] In one embodiment, the condenser 31 is configured as an air-cooled condenser and is installed outdoors. The condenser 31 includes at least one fan unit, and each fan unit includes at least one fixed-frequency fan and at least one variable-frequency fan.

[0044] Among them, a fixed-frequency fan refers to a fan with a constant speed; a variable-frequency fan refers to a fan with an adjustable speed. Since the condenser 31 is located outdoors, the outdoor ambient temperature is different in winter and summer, and the condensation effect on the refrigerant is also different. Specifically, in summer, the fan needs to maintain a relatively high speed so that the air and the refrigerant in the condenser 31 can fully exchange heat to improve the condensation effect. In winter, no fan is required, or only the fan needs to maintain a relatively low speed to meet the condensation requirements. Therefore, each fan group is provided to include at least one fixed-frequency fan and at least one variable-frequency fan, so as to facilitate the adjustment of the total power of each fan group according to demand, thereby helping to avoid energy waste.

[0045] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A chiller for year-round refrigeration, characterized in that: The year-round refrigeration chiller comprises a compressor (10), a throttling element (20), a condenser (31), a bypass flow path (50), a switch element (60) and a temperature sensor; the compressor (10) outlet is connected to the throttling element (20) inlet to form a high-pressure flow path (30); the condenser (31) is arranged on the high-pressure flow path (30); the switch element (60) is arranged on the bypass flow path (50); and both ends of the bypass flow path (50) are respectively connected to the high-pressure flow path (30) and are arranged in parallel with the condenser (31); The temperature sensor is used to detect the current ambient temperature t1. During the startup of the year-round cooling water chiller, the switch element (60) can respond to the current ambient temperature t1 signal measured by the temperature sensor to connect or disconnect the bypass flow path (50).

2. The chiller for year-round refrigeration according to claim 1, characterized in that: During the startup process of the water chiller for year-round refrigeration, the switch element (60) is configured to be able to be turned on in response to the current ambient temperature t1 being less than a preset ambient temperature value T1, so that the bypass flow path (50) is connected; Furthermore, the switch element (60) is configured to be closed in response to the current ambient temperature t1 being greater than a preset ambient temperature value T1, so as to isolate the bypass flow path (50).

3. The chiller for year-round refrigeration according to claim 1, characterized in that: The year-round cooling water chiller also includes an evaporator (41), which is connected in series between the inlet of the compressor (10) and the outlet of the throttling element (20).

4. The chiller for year-round refrigeration according to claim 3, characterized in that: The critical temperature at which the refrigerant changes from liquid to gas in the evaporator (41) is defined as the evaporation temperature T e The saturation temperature of the refrigerant when condensing in the condenser (31) is defined as the condensation temperature T c ; During the operation of the chiller for year-round cooling, the switch element (60) is configured to respond to the evaporation temperature T e is lower than the first protection temperature T2, and the condensation temperature T c The bypass flow path (50) is opened when the temperature is lower than the second protection temperature T3.

5. The chiller for year-round refrigeration according to claim 4, characterized in that: During the operation of the chiller for year-round cooling, the switch element (60) is configured to respond to the evaporation temperature T e The switch (60) is configured to be able to respond to the condensation temperature T c The temperature is greater than the second protection temperature T3 and is closed for a preset time t, so that the bypass flow path (50) is isolated.

6. The chiller for year-round refrigeration according to claim 1, characterized in that: The switch element (60) is configured as a solenoid valve.

7. The chiller for year-round refrigeration according to claim 6, characterized in that: The year-round cooling water chiller also includes a controller, a first pressure sensor (71) and a second pressure sensor (72), wherein the first pressure sensor (71) is used to detect the evaporation pressure when the year-round cooling water chiller is in operation, and the second pressure sensor (72) is used to detect the condensation pressure when the year-round cooling water chiller is in operation; The temperature sensor, the solenoid valve, the first pressure sensor (71) and the second pressure sensor (72) are respectively connected to the controller, and the controller can control the switch element (60) to open or close according to the current ambient temperature t1, evaporation pressure and condensation pressure.

8. The chiller according to any one of claims 1 to 7, characterized in that: A heat recovery device (32) is also provided on the high-pressure flow path (30), and the heat recovery device (32) has a refrigerant flow path and a hot water flow path. The refrigerant flow path is connected in series between the compressor (10) and the condenser (31), and the hot water flow path is used to circulate heat recovery water. One end of the bypass flow path (50) is connected to the refrigerant flow path of the heat recovery device (32).

9. The water chiller according to claim 8, characterized in that: A liquid reservoir (33) is also provided on the high-pressure flow path (30). The liquid reservoir (33) is connected in series between the condenser (31) and the throttling element (20), and the other end of the bypass flow path (50) is connected to the liquid reservoir (33).

10. The water chiller according to claim 1, characterized in that: The condenser (31) is configured as an air-cooled condenser and is installed outdoors. The condenser (31) comprises at least one fan unit, and each of the fan units comprises at least one fixed-frequency fan and at least one variable-frequency fan.

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