CN216924801U - Outdoor unit for refrigerating unit and refrigerating unit - Google Patents

Abstract

The application relates to the technical field of refrigeration and freezing, and discloses an outdoor unit for a refrigerating unit, which comprises a compressor, an input pipeline, an outdoor heat exchanger, an output pipeline, a bypass pipeline and a bypass control valve, wherein the compressor is provided with an exhaust port and an air suction port; the first end of the input pipeline is connected to the air suction port of the compressor; the first end of the outdoor heat exchanger is connected to an exhaust port of the compressor through a first connecting pipeline; the first end of the output pipeline is connected to the second end of the outdoor heat exchanger; a first end of the bypass pipeline is communicated with the first connecting pipeline, and a second end of the bypass pipeline is communicated with the output pipeline; and the bypass control valve is arranged in the bypass pipeline and is used for controlling the on-off of the bypass pipeline. The application also discloses a refrigerating unit.

Description

Outdoor unit for refrigerating unit and refrigerating unit

Technical Field

The present invention relates to the field of refrigeration and freezing technologies, and for example, to an outdoor unit for a freezer unit and a freezer unit.

Background

The cold storage is generally kept at a lower temperature by a refrigerating unit, and the cold storage is divided into a high-temperature cold storage (a constant-temperature cold storage with a design temperature of 5-15 ℃), a medium-temperature cold storage (a cold storage with a refrigeration design temperature of 5-5 ℃) and a low-temperature cold storage (a refrigerating storage with a refrigeration design temperature of-18-25 ℃) according to the design temperature.

When the refrigerating unit works in a cold environment, the conditions of difficult starting, error shutdown after starting and the like can occur due to unstable air suction and exhaust pressure difference. This affects not only the stability of the temperature in the refrigerator but also the service life of the compressor. In the prior art, some refrigerating units are provided with a heating belt on a compressor, and the compressor is normally started by improving the temperature of the compressor.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the heating belt is arranged, so that the power consumption can be increased, the heating speed of the heating belt is relatively low, and the using effect is poor.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides an outdoor unit for a refrigerating unit and the refrigerating unit, so as to solve the problem of how to improve the operation stability of the refrigerating unit.

In some embodiments, the outdoor unit for a refrigerating unit comprises a compressor, an input pipeline, an outdoor heat exchanger, an output pipeline, a bypass pipeline and a bypass control valve, wherein the compressor is provided with an exhaust port and a suction port; the first end of the input pipeline is connected with the air suction port of the compressor; the first interface is connected to the exhaust port of the compressor through a first connecting pipeline; the first end of the output pipeline is connected to the second interface of the outdoor heat exchanger; the first end of the bypass pipeline is communicated with the first connecting pipeline, and the second end of the bypass pipeline is communicated with the output pipeline; and the bypass control valve is arranged on the bypass pipeline and is used for controlling the on-off of the bypass pipeline.

In some embodiments, the outdoor unit further includes a high pressure sensor, a low pressure sensor, and a control unit, wherein the high pressure sensor is disposed on the first connecting line and configured to obtain a discharge pressure of the compressor; the low-pressure sensor is arranged on the input pipeline and used for acquiring the suction pressure of the compressor; a control part configured to open the bypass control valve in a case where a first difference between a discharge pressure and a suction pressure of the compressor is greater than a first preset value.

In some embodiments, the outdoor unit further includes a temperature sensor disposed in the input pipeline and configured to acquire a temperature of the refrigerant in the input pipeline; the control part is further configured to open the bypass control valve when the temperature of the refrigerant in the input pipeline is lower than a preset temperature.

In some embodiments, the bypass control valve is a pressure balancing valve that opens automatically if the pressure differential is greater than a preset value.

In some embodiments, the outdoor unit further comprises a high pressure accumulator connected to the output pipe; and the position at which the second end of the bypass pipeline is communicated with the output pipeline is positioned between the outdoor heat exchanger and the high-pressure liquid storage device.

In some embodiments, the outdoor unit further includes a heating device disposed in the high pressure accumulator for increasing a temperature of the refrigerant in the high pressure accumulator.

In some embodiments, the outdoor unit further includes a first cut-off valve disposed on the input pipe; and/or the second stop valve is arranged on the output pipeline.

In some embodiments, the outdoor unit further comprises a gas-liquid separator disposed in the input pipe; and/or, a dry filter is arranged on the output pipeline.

In some embodiments, the refrigeration unit comprises the outdoor unit, the throttling device and the indoor heat exchanger, wherein a first end of the throttling device is connected to a second end of the output pipeline; and one interface of the indoor heat exchanger is connected to the second end of the throttling device, and the other interface of the indoor heat exchanger is connected to the second end of the input pipeline.

In some embodiments, the indoor heat exchanger is a plate heat exchanger, and a refrigerant heat exchange channel is further arranged in the plate heat exchanger; the refrigerating unit also comprises a secondary refrigerant heat exchanger and a secondary refrigerant circulating pump, wherein two ports of the secondary refrigerant heat exchanger are respectively connected to two ends of the secondary refrigerant heat exchange passage through secondary refrigerant connecting pipelines so as to form a secondary refrigerant circulating loop; and the secondary refrigerant circulating pump is arranged on the secondary refrigerant connecting pipeline and is used for driving the secondary refrigerant in the secondary refrigerant circulating loop to flow.

The outdoor unit for the refrigerating unit and the refrigerating unit provided by the embodiment of the disclosure can realize the following technical effects:

the bypass pipeline is arranged, so that the circulating resistance of the refrigerant circulating system can be reduced, the pressure difference of air suction and exhaust of the compressor is reduced, and the stable operation of the starting of the compressor is facilitated.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a schematic diagram of a refrigeration unit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of another refrigeration unit provided by the embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an outdoor unit for a refrigeration unit according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a bypass control valve of an outdoor unit according to an embodiment of the present disclosure.

Reference numerals:

110: a compressor; 120: an outdoor heat exchanger; 130: a high pressure reservoir; 131: a heating device; 140: a gas-liquid separator; 150: drying the filter; 160: a throttling device; 170: an indoor heat exchanger;

210: an input pipeline; 220: an output pipeline; 230: a first connecting line; 240: a bypass line; 241: a bypass control valve; 250: a high pressure sensor; 260: a low pressure sensor; 270: a temperature sensor; 280: a first shut-off valve; 290: a second stop valve;

310: a secondary refrigerant heat exchanger; 320: a secondary refrigerant circulating pump; 330: a coolant storage tank.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

Referring to fig. 1 to 4, an embodiment of the present disclosure provides a refrigeration unit including an outdoor unit, a throttling device 160, and an indoor heat exchanger 170. The outdoor unit comprises a compressor 110, an input pipeline 210, an outdoor heat exchanger 120, an output pipeline 220, a bypass pipeline 240 and a bypass control valve 241, wherein the compressor 110 is provided with an exhaust port and a suction port; an input pipe 210 having a first end connected to a suction port of the compressor 110; an outdoor heat exchanger 120 connected to a discharge port of the compressor 110 through a first connection pipe 230; an output pipe 220 having a first end connected to the second port of the outdoor heat exchanger 120; a bypass line 240 having a first end connected to the first connection line 230 and a second end connected to the output line 220; a bypass control valve 241 disposed in the bypass line 240, the bypass control valve 241 being configured to control on/off of the bypass line 240; a first end of throttling device 160 is connected to a second end of outlet line 220; and one port of the indoor heat exchanger 170 is connected to the second end of the throttling device 160, and the other port of the indoor heat exchanger is connected to the second end of the input pipeline 210.

In the embodiment of the present disclosure, the refrigeration unit includes an indoor unit and an outdoor unit, the outdoor unit includes a compressor 110 and an outdoor heat exchanger 120, and the indoor unit includes a throttling device 160 and an indoor heat exchanger 170. The indoor unit and the outdoor unit are connected through a refrigerant pipeline. In the refrigerating unit, a compressor 110, an outdoor heat exchanger 120, a throttling device 160 and a heat exchanger are connected in sequence through refrigerant pipelines to form a first refrigerant circulation loop. The gaseous refrigerant is compressed by the compressor 110 to become a high-temperature and high-pressure gaseous refrigerant, and then cooled by the outdoor heat exchanger 120 to become a liquid refrigerant, and throttled by the throttling device 160 to enter the indoor heat exchanger 170. The liquid refrigerant evaporates and absorbs heat in the indoor heat exchanger 170 to become a gaseous refrigerant, and simultaneously evaporates and absorbs a large amount of heat, thereby reducing the temperature of the indoor heat exchanger 170, and returns to the compressor 110 through the indoor heat exchanger 170. The heat in the room is conveyed to the outside by the reciprocating circulation, so that the temperature in the room is reduced. Two ports of the indoor heat exchanger 170 are respectively connected to the suction port of the compressor 110 and the throttling device 160, a first end of the throttling device 160 is connected to the outdoor heat exchanger 120 through the output pipeline 220, and a second end is connected to the indoor heat exchanger 170.

When the refrigerant circulates in the refrigerant circulation system, a line between the suction port of the compressor 110 and the throttling device 160 is a low pressure line, and a line between the discharge port of the compressor 110 and the throttling device 160 is a high pressure line. When the compressor 110 operates, it is necessary to suck the low-pressure gaseous refrigerant in the low-pressure pipeline into the compressor 110, compress the refrigerant into a high-pressure gaseous refrigerant, and discharge the high-pressure gaseous refrigerant. If the pressure difference between the suction port and the discharge port of the compressor 110 is large and exceeds the operation capacity of the compressor 110, the compressor 110 cannot operate, and a start-up failure or a malfunction may occur.

The pressure difference between the suction port and the discharge port of the compressor 110 is caused by the throttle resistance of the throttle device 160, and the on-way resistance of the refrigerant in the indoor heat exchanger 170, the outdoor heat exchanger 120, and the refrigerant pipe. A first end of the bypass line 240 communicates with the first connecting line 230, and a second end communicates with the output line 220. The bypass line 240 is provided with a bypass control valve 241 to control the opening and closing of the bypass line 240. When the bypass line 240 is turned on, the refrigerant passes through the compressor 110, the throttling device 160, and the indoor heat exchanger 170 to form a second refrigerant circulation circuit. Compared with the first refrigerant circulation loop, the on-way resistance of the refrigerant circulating in the first circulation loop is reduced, and the pressure difference between the suction port and the exhaust port of the compressor 110 is reduced, so that the starting and the operation of the compressor 110 are facilitated.

At the initial stage of the start of the compressor 110, the lubricant oil in the compressor 110 is discharged from the discharge port along with the gaseous refrigerant, and the refrigerant at the suction end cannot be timely supplemented to the compressor 110, which may result in poor lubrication of the compressor 110. The compressor 110 may have abnormal noise when the lubrication is poor, and the temperature of the compressor 110 may be abnormally increased, which may also result in the abnormal start of the compressor 110. When the bypass line 240 is turned on, the high-temperature gaseous refrigerant discharged from the compressor 110 is circulated through the second refrigerant circulation circuit. The refrigerant does not pass through the outdoor heat exchanger 120, and the temperature of the refrigerant is relatively high. Although the refrigerant is throttled and depressurized by the throttle device 160, the temperature of the refrigerant at various places in the second refrigerant circulation circuit is increased. The refrigerant in the second refrigerant circulation circuit has higher temperature, and is easier to become gaseous refrigerant in the evaporator, thereby improving the flow speed of the refrigerant in the second refrigerant circulation circuit. The refrigerant flowing speed is fast, which is beneficial to bringing the lubricating oil in the refrigerant pipeline and the indoor heat exchanger 170 back to the compressor 110, thereby ensuring good lubrication of the compressor 110, and further, being beneficial to the start and the stable operation of the compressor 110.

Optionally, the indoor heat exchanger 170 is a plate heat exchanger, and a refrigerant heat exchange passage is further disposed in the plate heat exchanger; the refrigerating unit further includes: two ports of the secondary refrigerant heat exchanger 310 are connected to two ends of the secondary refrigerant heat exchange passage through secondary refrigerant connecting pipelines to form a secondary refrigerant circulating loop; and the secondary refrigerant circulating pump 320 is arranged on the secondary refrigerant connecting pipeline and is used for driving the secondary refrigerant in the secondary refrigerant circulating loop to flow.

The plate heat exchanger is a high-efficiency heat exchanger formed by stacking a series of metal sheets with certain corrugated shapes. Thin rectangular channels are formed between the various plates through which heat is exchanged. The plate heat exchanger is an ideal device for liquid-liquid and liquid-gas heat exchange. The heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, wide application, long service life and the like. Under the condition of the same pressure loss, the heat transfer coefficient of the heat exchanger is 3-5 times higher than that of the tubular heat exchanger, the occupied area of the heat exchanger is one third of that of the tubular heat exchanger, and the heat recovery rate can reach more than 90 percent. The plate heat exchanger is configured with a refrigerant heat exchange passage and a secondary refrigerant heat exchange passage, and the compressor 110 and the throttling device 160 are connected to both ends of the refrigerant passage. The coolant heat exchanger 310 absorbs heat from the room, transfers the heat to the plate heat exchanger through the coolant circulation circuit, and transfers the heat to the coolant in the coolant path in the plate heat exchanger. The refrigerant circulation loop realizes refrigeration by depending on gas-liquid two-phase change of the refrigerant, and the secondary refrigerant circulation loop only realizes heat transfer and does not need gas-liquid two-phase change. The most common coolant is water. Through setting up plate heat exchanger and secondary refrigerant circulation circuit, can shorten the length of refrigerant pipeline, reduce the injection volume of refrigerant circulation system refrigerant, greatly reduced the cost of refrigerating unit. The heat conduction of the secondary refrigerant does not need gas-liquid two-phase change, the specific heat capacity of the secondary refrigerant is high, the temperature in the cold storage is controlled by using the secondary refrigerant circulation loop, and the cooling effect is stable and uniform.

Optionally, the coolant is ethylene glycol.

For a cold storage with the design temperature lower than zero, the melting point of the secondary refrigerant is lower than zero. Although the use of water as a coolant is relatively inexpensive and readily available, water freezes at zero degrees and is no longer suitable as a coolant. The melting point of ethylene glycol was-12.9 ℃. The ethylene glycol has relatively low cost and can not corrode pipelines. The ethylene glycol is used as a secondary refrigerant to enlarge and improve the refrigerating range of the refrigerating unit.

Optionally, the refrigeration unit further includes a coolant storage tank 330 disposed in the coolant connection of the coolant circulation circuit.

The coolant storage tanks 330 can be configured to increase the coolant charge in the coolant circulation circuit. The coolant circulation system can continuously cool, and can continuously operate when the temperature in the freezer does not need to be continuously reduced, and the generated cold is temporarily stored in the coolant storage tank 330 along with the coolant. Therefore, when the refrigeration house needs to be rapidly cooled, the secondary refrigerant in the secondary refrigerant circulation loop can cool the refrigeration house at a speed exceeding the refrigeration efficiency of the secondary refrigerant circulation system. The coolant storage tank 330 is provided to increase the cooling capacity of the chiller unit. In addition, when the coolant in the coolant connecting lines decreases due to evaporation, leakage, or the like, the coolant in the coolant storage tanks 330 can be replenished into the coolant connecting lines in time, thereby preventing air columns from being generated in the coolant circulation circuit to affect the coolant circulation.

Optionally, the outdoor unit further comprises a high pressure sensor 250, a low pressure sensor 260 and a control unit, wherein the high pressure sensor 250 is disposed on the first connection pipe 230 and is used for obtaining a discharge pressure of the compressor 110; a low pressure sensor 260 disposed on the input line 210 for acquiring a suction pressure of the compressor 110; a control part configured to open the bypass control valve 241 in a case where a first difference between a discharge pressure and a suction pressure of the compressor 110 is greater than a first preset value.

The pressure at the suction port and the pressure at the discharge port of the compressor 110 are obtained by the high pressure sensor 250 and the low pressure sensor 260, so that the controller can calculate the pressure difference between the suction and discharge of the compressor 110. If the suction/discharge gas pressure difference is greater than the first preset value, it is considered that the compressor 110 is difficult to start or has a possibility of a faulty shutdown. At this time, the controller controls the bypass control valve 241 to open, thereby conducting the bypass line 240. At this time, the refrigerant passes through the compressor 110, the throttling device 160, and the indoor heat exchanger 170 to form a second refrigerant circulation circuit. When the refrigerant circulates through the second refrigerant circulation circuit, the on-path resistance decreases, the suction temperature of the compressor 110 increases, the suction pressure of the compressor 110 increases, and the suction/discharge pressure difference of the compressor 110 decreases. In this way, normal start-up and stable operation of the compressor 110 is facilitated.

Optionally, the temperature sensor 270 is disposed in the input pipeline 210, and configured to obtain a temperature of the refrigerant in the input pipeline 210; the control unit is further configured to open the bypass control valve 241 when the temperature of the refrigerant in the input line 210 is lower than a preset temperature.

When the temperature of the refrigerant in the input pipeline 210 is relatively low, the pressure of the refrigerant in the input pipeline 210 is also reduced compared with the suction pressure of the compressor 110, and the pressure difference between the suction and the discharge of the compressor 110 is relatively large. When the temperature in the input pipeline 210 is relatively low, there is a possibility that liquid refrigerant exists in the refrigerant in the input pipeline 210, and the liquid refrigerant entering the compressor 110 may knock, which may affect the service life of the compressor 110. Therefore, when the temperature of the refrigerant in the input line 210 is relatively low, the controller controls the bypass control valve 241 to open, and the bypass line 240 is conducted. At this time, the refrigerant passes through the compressor 110, the throttling device 160, and the indoor heat exchanger 170 to form a second refrigerant circulation circuit. When the refrigerant circulates through the second refrigerant circulation circuit, the on-path resistance decreases, the suction temperature of the compressor 110 increases, the suction pressure of the compressor 110 increases, and the suction/discharge pressure difference of the compressor 110 decreases. Thus, normal start-up and stable operation of the compressor 110 are facilitated.

Optionally, the bypass control valve 241 is a pressure balance valve that opens automatically if the pressure difference is greater than a preset value.

A movable valve core is arranged in the pressure flat valve, the valve core blocks an air flow channel in the pressure balance valve in a natural state, and when the air inlet pressure exceeds a preset value, the valve core moves under the driving of the air inlet pressure to enable the air flow channel in the pressure balance valve to be communicated. And when the pressure is smaller than the preset value, the valve core resets to plug the air flow channel. The valve core can be reset by gravity or by a spring. When the valve core is reset by gravity, the air inlet pressure is upward under the action of the valve core, so that the valve core moves upward under the action of gravity. When the air inlet pressure is reduced, the valve core falls down under the action of gravity to block the air flow channel. When the valve core is reset by the spring, the acting force of the intake pressure on the valve core is opposite to the acting force of the spring on the valve core. The air inlet pressure exceeds the elastic force of the spring, the valve core moves to conduct the air flow channel, the air inlet pressure is reduced, and the valve core recovers the blocking state of the air flow channel under the elastic force of the spring. The bypass control valve 241 is a pressure balance valve, which can realize automatic pressure balance of the refrigerant circulation system, simplify the control process, and improve the working stability of the refrigerating unit.

Optionally, the outdoor unit further includes a high pressure accumulator 130, the high pressure accumulator 130 is disposed on the output pipeline 220; a second end of the bypass line 240 is connected to the output line 220 at a position between the outdoor heat exchanger 120 and the high pressure accumulator 130.

The high pressure accumulator 130 is located between the outdoor heat exchanger 120 and the throttling device 160, and the high pressure accumulator 130 can store the liquid refrigerant flowing out of the outdoor heat exchanger 120, so that the heat transfer area of the condenser can fully play a role, and the refrigerant circulation amount in the refrigerant circulation system can be ensured to be adjusted through the gas-liquid two-phase balance of the refrigerant in the high pressure accumulator 130. Meanwhile, the high pressure accumulator 130 also performs a liquid sealing function to prevent the high pressure gaseous refrigerant from entering a low pressure pipeline between the throttling device 160 and the suction gas of the compressor 110 through the throttling device 160. The high-pressure liquid outlet pipe is arranged, so that the working stability of the refrigerating unit can be improved.

Optionally, the outdoor unit further includes a heating device 131 disposed in the high pressure accumulator 130 for increasing the temperature of the refrigerant in the high pressure accumulator 130.

The temperature of the refrigerant in the high pressure accumulator 130 is increased, and the temperature of the refrigerant in the refrigerant circulation system is increased as a whole, so that the suction of the compressor 110 is increased, the pressure difference between the suction and the discharge of the compressor 110 is reduced, and the compressor 110 is more easily started.

Optionally, the control part is further configured to control the heating device 131 to be turned on if the first difference is greater than a second preset value.

And when the first difference is larger than the second preset value, the pressure difference of the suction gas and the exhaust gas of the compressor 110 is large, so that the compressor is in fault shutdown risk. At this time, the control unit controls the heating device 131 to be turned on. The refrigerant in the high-pressure accumulator 130 is in a gas-liquid two-phase dynamic equilibrium state. When the temperature of the high pressure accumulator 130 increases, the refrigerant in the high pressure accumulator 130 is more easily evaporated into a gaseous refrigerant. The gaseous refrigerant in the high pressure liquid storage 130 is increased, the liquid refrigerant is decreased, the refrigerant temporarily stored in the high pressure liquid storage 130 is decreased, the refrigerant flow rate in the first refrigerant circulation loop or the second refrigerant circulation loop is increased, the suction pressure of the compressor 110 is increased, and the pressure difference between the suction and the exhaust of the compressor 110 is decreased. Thus, smooth operation of the compressor 110 is facilitated.

Optionally, the second preset value is greater than the first preset value.

After the bypass line 240 is opened, if the pressure difference between the air and the air of the compressor 110 is still relatively large, the heating device 131 is activated to increase the temperature of the refrigerant in the high-pressure liquid storage tank. The second preset value is larger than the first preset value, and the conduction of the bypass pipeline is prior to the starting of the heating device. Therefore, the extra energy consumption required by starting the heating device 131 can be reduced as much as possible, and the power consumption of the refrigerating unit is reduced while the stable operation of the refrigerating unit is ensured.

Optionally, the outdoor unit further includes a first stop valve 280 disposed on the input pipeline 210; and/or a second shut-off valve 290 disposed in the outlet line 220.

The first and second stop valves 280 and 290 are provided to facilitate installation and maintenance of the refrigerating unit by closing the connection between the indoor unit and the outdoor unit of the first and second stop valves 280 and 290.

Optionally, the outdoor unit further includes a gas-liquid separator 140 disposed in the input pipeline 210; and/or, a dry filter 150 is disposed in the output line 220.

The gas-liquid separator 140 may separate and store the liquid refrigerant returned to the press machine, so as to prevent the liquid refrigerant from entering the compressor 110 and knocking.

The filter drier 150 filters the refrigerant to prevent contaminants from blocking the pipeline. The dry filter 150 dries the refrigerant. The refrigerant contains certain moisture, when the refrigerant containing the moisture flows to the throttling device 160, the temperature is sharply reduced, the solubility of the water in the refrigerant is reduced, the water can be separated out and frozen to block the throttling device 160, and the throttling device 160 can be blocked in serious cases, so that the refrigerating unit is stopped. In addition, the long-term dissolution of water in the refrigerant can generate hydrochloric acid, not only corrode metals, but also emulsify the refrigeration oil. The drying filter 150 is arranged to absorb water in the refrigerant completely, so that stable operation of the refrigerating unit is guaranteed, and the service life of the refrigerating unit is prolonged.

As shown in fig. 1 to 4, an embodiment of the present disclosure provides an outdoor unit for a refrigerating unit, including a compressor 110, an input pipe 210, an outdoor heat exchanger 120, an output pipe 220, a bypass pipe 240, and a bypass control valve 241, wherein the compressor 110 has a discharge port and a suction port; an input pipe 210 having a first end connected to a suction port of the compressor 110; an outdoor heat exchanger 120 connected to a discharge port of the compressor 110 through a first connection pipe 230; an output pipe 220 having a first end connected to the second port of the outdoor heat exchanger 120; a bypass line 240 having a first end connected to the first connection line 230 and a second end connected to the output line 220; and a bypass control valve 241 provided in the bypass line 240, the bypass control valve 241 controlling the opening and closing of the bypass line 240.

The indoor unit directly exchanging heat with the preset cooling space is connected to the outdoor unit through an input pipe 210 and an output pipe 220 to form a refrigerant circulation loop. When the outdoor unit provided by the embodiment of the present disclosure is used, the bypass control valve 241 may be opened when the pressure difference between the air suction and the air discharge of the compressor 110 is large, so as to turn on the bypass pipeline 240, thereby reducing the on-way resistance in the refrigerant circulation loop and increasing the air suction pressure of the compressor 110. Further, the compressor 110 is normally started and smoothly operated.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. An outdoor unit for a refrigeration unit, comprising:

a compressor having an exhaust port and an intake port;

the first end of the input pipeline is connected with the air suction port of the compressor;

the first interface is connected to an exhaust port of the compressor through a first connecting pipeline;

the first end of the output pipeline is connected to the second interface of the outdoor heat exchanger;

the first end of the bypass pipeline is communicated with the first connecting pipeline, and the second end of the bypass pipeline is communicated with the output pipeline;

and the bypass control valve is arranged on the bypass pipeline and is used for controlling the on-off of the bypass pipeline.

2. The outdoor unit of claim 1, further comprising:

the high-pressure sensor is arranged on the first connecting pipeline and used for acquiring the exhaust pressure of the compressor;

the low-pressure sensor is arranged on the input pipeline and used for acquiring the suction pressure of the compressor;

a control part configured to open the bypass control valve in a case where a first difference between a discharge pressure and a suction pressure of the compressor is greater than a first preset value.

3. The outdoor unit of claim 2, further comprising:

the temperature sensor is arranged on the input pipeline and used for acquiring the temperature of the refrigerant in the input pipeline;

the control part is further configured to open the bypass control valve when the temperature of the refrigerant in the input pipeline is lower than a preset temperature.

4. The outdoor unit of claim 1,

the bypass control valve is a pressure balance valve, and the pressure balance valve is automatically opened under the condition that the pressure difference between two ends is greater than a preset value.

5. The outdoor unit of claim 1, further comprising:

the high-pressure liquid storage device is connected to the output pipeline;

and the position where the second end of the bypass pipeline is communicated with the output pipeline is positioned between the outdoor heat exchanger and the high-pressure liquid storage device.

6. The outdoor unit of claim 5, further comprising:

and the heating device is arranged on the high-pressure liquid storage device and used for increasing the temperature of the refrigerant in the high-pressure liquid storage device.

7. The outdoor unit of any one of claims 1 to 6, further comprising:

the first stop valve is arranged on the input pipeline; and/or the presence of a gas in the gas,

and the second stop valve is arranged on the output pipeline.

8. The outdoor unit of claim 7, further comprising:

the gas-liquid separator is arranged on the input pipeline; and/or the presence of a gas in the gas,

and the drying filter is arranged on the output pipeline.

9. A refrigeration unit, comprising:

the outdoor unit of any one of claims 1 to 8; and the combination of (a) and (b),

the first end of the throttling device is connected to the second end of the output pipeline;

and one interface of the indoor heat exchanger is connected to the second end of the throttling device, and the other interface of the indoor heat exchanger is connected to the second end of the input pipeline.

10. Refrigeration unit according to claim 9,

the indoor heat exchanger is a plate heat exchanger, and a refrigerant heat exchange passage is also arranged in the plate heat exchanger;

the refrigerating unit further includes:

the two ports of the secondary refrigerant heat exchanger are respectively connected to the two ends of the secondary refrigerant heat exchange passage through secondary refrigerant connecting pipelines so as to form a secondary refrigerant circulating loop;

and the secondary refrigerant circulating pump is arranged on the secondary refrigerant connecting pipeline and is used for driving the secondary refrigerant in the secondary refrigerant circulating loop to flow.

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