Liquid accumulator structure and air conditioning unit

Abstract

The utility model discloses a liquid storage device structure and an air conditioning unit, the liquid storage device structure comprises a liquid storage device and an economizer arranged at the bottom of the liquid storage device, the upper part of the liquid storage device is provided with a condenser interface, and one side of the liquid storage device is provided with a shell pass liquid outlet communicated with the interior of the liquid storage device; the economizer comprises a supercooling flow path and a vaporization flow path exchanging heat with the supercooling flow path, and inlets and outlets of the supercooling flow path and the vaporization flow path extend out of the liquid storage device. According to the utility model, one part is separated from the bottom of the liquid storage device to be independently used for heat exchange of the economizer, and forms an independent self-circulation system with economizer equipment, so that no pipeline loss exists on the system; therefore, the problems that the heat exchange effect is affected by the high refrigerant temperature in the liquid storage device under different working conditions, and system control is difficult due to different air supply temperatures of parallel units are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a liquid storage structure and an air conditioning unit. Background Art

[0002] For low-temperature parallel screw units, the unit is equipped with a liquid reservoir to compensate for the change in the condenser liquid level caused by load changes. When the electronic expansion valve of the refrigeration system is opened / closed, the liquid level of the condenser will change. If there is no "extra" refrigerant in the liquid reservoir, the amount of liquid in front of the electronic expansion valve may be insufficient, causing the throttling device to fail to work properly, causing the entire system to become unstable. At the same time, the liquid reservoir also serves as an additional container to help separate the liquid refrigerant from the refrigerant vapor, ensuring that pure liquid refrigerant leaves the liquid reservoir, playing the role of liquid seal, and preventing high-pressure refrigerant gas from escaping into the low-pressure system pipeline. In order to solve the problems of poor refrigeration efficiency and slow temperature pulling in the cold storage, this type of system generally sets a plate heat exchanger that matches the number of compressors after the liquid reservoir to cool the refrigerant liquid again. This is an intercooler, also known as an economizer.

[0003] Existing parallel screw units such as Figure 1 As shown, the refrigerant discharged from the exhaust port of the compressor 3 reaches the oil separator 4 for air-oil separation, the separated refrigerant flows to the condenser for heat exchange, the separated oil is cooled by the oil cooler 5 and returns to the compressor 3, the refrigerant after heat exchange flows from the condenser to the liquid reservoir 1, the refrigerant flowing out of the liquid reservoir 1 reaches two economizers 2 in sequence, and the two economizers 2 are respectively provided with two compressors 3, a part of the refrigerant is vaporized from the economizer 2 and returns to the corresponding air supply port of the compressor 3, and the other part of the supercooled refrigerant directly flows to the evaporator, and returns to the compressor 3 after heat exchange in the evaporator.

[0004] However, for low-temperature parallel screw units, the use of liquid storage devices and independent plate heat exchangers has the following problems that cannot be solved, which affects the heat exchange effect of the unit. First, the liquid inlet of the economizer is on the liquid collecting pipe. Due to the existence of resistance along the way, each economizer has uneven liquid distribution. At the same time, there is pipeline loss, which makes the control of the parallel unit system more difficult. Utility Model Content

[0005] In order to solve the technical problem that the parallel screw units in the prior art are provided with independent plate heat exchangers, which results in pipeline loss and affects the heat exchange effect, the utility model provides a liquid storage structure and an air conditioning unit.

[0006] The technical solution adopted by the utility model is:

[0007] The utility model proposes a liquid reservoir structure, comprising: a liquid reservoir, an economizer arranged at the bottom of the liquid reservoir, a condenser interface being arranged at the top of the liquid reservoir, and a shell-side liquid outlet being arranged at one side of the liquid reservoir and communicating with the interior of the liquid reservoir; the economizer comprises a subcooling flow path and a vaporizing flow path for exchanging heat with the subcooling flow path, and the inlets and outlets of the subcooling flow path and the vaporizing flow path extend out of the liquid reservoir.

[0008] Furthermore, the subcooling inlet of the subcooling flow path is arranged on one side of the liquid reservoir for connecting to the shell-side liquid outlet, and the subcooling outlet is arranged on the other side of the liquid reservoir for connecting to the evaporator liquid supply; the vaporization inlet and vaporization outlet of the vaporization flow path are arranged at the bottom of the liquid reservoir, wherein the vaporization outlet is used to connect to the compressor for air supply.

[0009] Furthermore, a plurality of interfaces are provided on the upper portion of the liquid storage device, each of which is provided with a safety valve, a filling valve and a vacuum valve.

[0010] Furthermore, a balancing port interface is also provided on the upper portion of the liquid reservoir.

[0011] Furthermore, the shell-side liquid outlet is connected to one end of a shell-side pipeline, and the other end of the shell-side pipeline is branched to form a first shell-side pipeline and a second shell-side pipeline, the first shell-side pipeline is connected to the subcooling inlet of the subcooling flow path, and the second shell-side pipeline is provided with a throttle valve and connected to the vaporization inlet of the vaporization flow path.

[0012] Furthermore, the pipe diameter of the supercooling flow path is larger than the pipe diameter of the vaporizing flow path, and the pipe of the supercooling flow path is arranged in close contact with the pipe of the vaporizing flow path for heat exchange.

[0013] Preferably, a plurality of economizers are provided at the bottom of the liquid reservoir.

[0014] The present invention also provides an air conditioning unit, comprising: the above-mentioned liquid storage structure.

[0015] Preferably, the air conditioning unit is a parallel screw unit.

[0016] The parallel screw unit comprises: the liquid storage tank, an evaporator, a condenser, a compressor corresponding to each of the economizers, and an oil separator connected to all the compressors.

[0017] Compared with the prior art, the liquid storage type enthalpy-increasing heat exchange parallel screw unit system with built-in economizer proposed in the utility model separates a part at the bottom of the liquid storage device for separate heat exchange of the economizer, and forms an independent self-circulation system with the economizer equipment. There is no pipeline loss in the system, thereby solving the problems of high refrigerant temperature in the liquid storage device affecting the heat exchange effect under different working conditions and difficulty in system control due to different air supply temperatures of the parallel units. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a structural schematic diagram of the prior art;

[0020] Figure 2 It is a schematic diagram of the structure in the embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of a specific embodiment of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the refrigerant flow in a specific embodiment of the utility model;

[0023] Figure 5 It is a complete structural schematic diagram of a specific embodiment of the utility model;

[0024] 1. Liquid reservoir;

[0025] 11. Shell side liquid outlet;

[0026] 12. Safety valve;

[0027] 13. Filling valve;

[0028] 14. Vacuum valve; 15. Drain valve;

[0029] 2. Economizer;

[0030] 211, subcooling inlet; 212, subcooling outlet; 221, vaporization inlet; 222, vaporization outlet;

[0031] 3. Compressor;

[0032] 4. Oil separator;

[0033] 5. Oil cooler;

[0034] 61. Straight-through stop valve; 62. Dry filter; 63. Sight glass; 64. Electronic expansion valve; 65. Oil filter; 66. Intake filter. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.

[0037] For low-temperature parallel screw units, the unit is equipped with a liquid reservoir to compensate for the change in the condenser liquid level caused by load changes. When the electronic expansion valve of the refrigeration system is opened / closed, the liquid level of the condenser will change. If there is no "extra" refrigerant in the liquid reservoir, the amount of liquid in front of the electronic expansion valve may be insufficient, causing the throttling device to fail to work properly, causing the entire system to become unstable. At the same time, the liquid reservoir also serves as an additional container to help separate the liquid refrigerant from the refrigerant vapor, ensuring that pure liquid refrigerant leaves the liquid reservoir, playing the role of liquid seal, and preventing high-pressure refrigerant gas from escaping into the low-pressure system pipeline. In order to solve the problems of poor refrigeration efficiency and slow temperature pulling in the cold storage, this type of system generally sets a plate heat exchanger that matches the number of compressors after the liquid reservoir to cool the refrigerant liquid again. This is an intercooler, also known as an economizer.

[0038] Existing parallel screw units such as Figure 1 As shown, the refrigerant discharged from the exhaust port of the compressor 3 reaches the oil separator 4 for air-oil separation, the separated refrigerant flows to the condenser for heat exchange, the separated oil is cooled by the oil cooler 5 and returns to the compressor 3, the refrigerant after heat exchange flows from the condenser to the liquid reservoir 1, the refrigerant flowing out of the liquid reservoir 1 reaches two economizers 2 in sequence, and the two economizers 2 are respectively provided with two compressors 3, a part of the refrigerant is vaporized from the economizer 2 and returns to the corresponding air supply port of the compressor 3, and the other part of the supercooled refrigerant directly flows to the evaporator, and returns to the compressor 3 after heat exchange in the evaporator.

[0039] It should be noted that Figure 1 Only some compressors of the parallel screw unit and the corresponding economizers and liquid receivers are shown.

[0040] However, for low-temperature parallel screw units, the use of liquid storage devices and independent plate heat exchangers has the following problems that cannot be solved, which affects the heat exchange effect of the unit. First, the liquid inlet of the economizer is on the liquid collecting pipe. Due to the existence of resistance along the way, each economizer has uneven liquid distribution. At the same time, there is pipeline loss, which makes the control of the parallel unit system more difficult.

[0041] Based on this, the utility model proposes a liquid storage type enthalpy-increasing heat exchange parallel screw unit system with a built-in economizer. A part is separated from the bottom of the liquid storage device to be used separately for heat exchange in the economizer, and an independent self-circulation system is formed with the economizer equipment. There is no pipeline loss in the system, thereby solving the problems of the high refrigerant temperature in the liquid storage device affecting the heat exchange effect under different working conditions and the difficulty in system control due to different air supply temperatures of the parallel units.

[0042] like Figure 2 As shown, the utility model specifically proposes a liquid reservoir 1 structure, including: a liquid reservoir 1, and an economizer 2 arranged in the liquid reservoir 1 and located at the bottom of the liquid reservoir 1. The liquid reservoir 1 is in the shape of a cylindrical tank, and the axis of the cylinder is horizontal, that is, the liquid reservoir 1 is horizontally arranged.

[0043] A condenser interface connected to the inside of the liquid reservoir 1 is provided at the top of the liquid reservoir 1 for connecting the condenser pipeline of the unit; a shell-side liquid outlet 11 directly connected to the inside of the liquid reservoir 1 is provided at one side of the liquid reservoir 1; the economizer 2 includes a subcooling flow path and a vaporization flow path, and the pipelines of the subcooling flow path and the vaporization flow path are laid at the bottom of the liquid reservoir 1 and contact each other for heat exchange, the inlet and outlet of the subcooling flow path extend out of the liquid reservoir 1 from the two side sides of the liquid reservoir 1 respectively, and the inlet and outlet of the vaporization flow path extend out of the liquid reservoir 1 from the bottom surface of the liquid reservoir 1 and are spaced apart.

[0044] By directly setting the economizer 2 at the bottom of the liquid reservoir 1, the pipe length can be reduced, the concentration is higher and it is more convenient for later control. There is no pipeline loss in the system, which solves the problems of the high refrigerant temperature in the liquid reservoir 1 affecting the heat exchange effect under different working conditions and the difficulty in system control due to different air supply temperatures of the parallel units.

[0045] The supercooling flow path specifically includes a supercooling inlet 211 and a supercooling outlet 212. The supercooling inlet 211 is arranged on the left side of the liquid reservoir 1, on the same side as the shell outlet of the liquid reservoir 1, and below the shell liquid outlet 11. The supercooling outlet 212 is arranged on the right side of the liquid reservoir 1, and is used to connect the evaporator liquid supply pipeline of the unit; the vaporization flow path specifically includes a vaporization inlet 221 and a vaporization outlet 222. The vaporization inlet 221 is arranged near the left side of the bottom of the liquid reservoir 1, and the vaporization outlet 222 is arranged at the right side of the bottom of the liquid reservoir 1. The vaporization outlet 222 is the vaporized refrigerant, and the vaporization outlet 222 is directly connected to the air supply port of the compressor 3.

[0046] like Figure 3 , 4 As shown, the shell-side liquid outlet 11 is connected to one end of the shell-side pipeline, and the other end of the shell-side pipeline is branched to form a first shell-side pipeline and a second shell-side pipeline. The first shell-side pipeline is connected to the subcooling inlet of the subcooling flow path, and the second shell-side pipeline is provided with a throttling valve, i.e., an electronic expansion valve, and is connected to the vaporization inlet of the vaporization flow path.

[0047] Furthermore, the diameter of the pipe in the supercooling flow path is larger than the diameter of the pipe in the vaporization flow path.

[0048] During specific operation, the high-temperature and high-pressure refrigerant compressed by the compressor 3 enters the condenser for condensation and heat exchange, and after heat exchange, enters the liquid reservoir 1 from the condenser for subsequent refrigeration cycle. When the liquid reservoir 1 supplies liquid to the evaporator, the liquid comes out from the shell-side liquid outlet 11 and passes through the shell-side pipeline, and will be divided into two paths. A small part of the liquid will pass through the expansion valve on the second shell-side pipeline to reduce the pressure and temperature and then flow through the vaporization path, while the other most of the liquid will pass through the first shell-side pipeline to reach the relatively thick copper tube, that is, the supercooling path. At this time, a small part of the liquid will instantly vaporize due to the effect of cooling and reducing pressure, and absorb most of the heat from the other pipeline for heat exchange, and this part of the liquid that has absorbed the heat will vaporize into gas and be sucked away and compressed by the compressor 3 again. The other supercooled liquid will be directly supplied to the evaporator, vaporize and absorb heat in the evaporator, achieving a good refrigeration effect.

[0049] In a specific embodiment, a plurality of interfaces connected to the liquid reservoir 1 are arranged at intervals on the top of the liquid reservoir 1, and a safety valve 12, an infusion valve 13, and a vacuum valve 14 are respectively arranged on the interfaces. The rightmost interface is a balancing port interface, which is used to connect the auxiliary liquid reservoir balancing port of the control component to balance the pressure in the liquid reservoir 1.

[0050] The bottom of the liquid reservoir 1 is also provided with an interface communicating with the interior of the liquid reservoir 1 as a sewage outlet, for setting a sewage valve 15 .

[0051] In a specific embodiment, a plurality of economizers 2 may be arranged at the bottom of the liquid storage tank 1 , which may be used in a parallel screw unit system having a plurality of compressors 3 , and each economizer 2 corresponds to one compressor 3 .

[0052] The utility model also provides an air conditioning unit, comprising the above-mentioned liquid storage device.

[0053] Specifically, the air conditioning unit is a parallel screw unit.

[0054] like Figures 3 to 5 As shown, the parallel screw unit specifically includes: multiple compressors 3 (only one is shown in the figure), oil separators that can correspond to multiple compressors 3 at the same time, a condenser connected to the oil separator, and the above-mentioned liquid reservoir 1 connected to the condenser, an economizer 2 in the liquid reservoir 1 correspondingly connected to one compressor 3, and an evaporator connected to the subcooling outlet 212 of the subcooling flow path of the economizer 2 in the liquid reservoir 1, and the evaporator is further connected to the suction line of the compressor 3.

[0055] The specific pipeline connection also includes valves and other components, as described below:

[0056] The top left position of the liquid reservoir 1 is connected to the subcooling pipeline of the condenser outlet, and a straight stop valve 61 is provided on the subcooling pipeline. The interface on the top right position of the liquid reservoir 1 is a balancing port interface, which is specifically connected to the return air pipeline, and a straight stop valve 61 is also provided on it.

[0057] The shell-side pipeline connected to the shell-side liquid outlet 11 on the left side of the liquid reservoir 1 is provided with a straight-through stop valve 61, a drying filter 62, a sight glass 63, a straight-through stop valve 61, and an electronic expansion valve 64 in sequence, and the other end of the connecting pipeline is branched to form a first shell-side pipeline and a second shell-side pipeline. The first shell-side pipeline is directly connected to the subcooling inlet 211 on the left side of the liquid reservoir 1, and the second shell-side pipeline is provided with a filter, an electronic expansion valve 64, an angle stop valve in sequence, and finally connected to the vaporization inlet 221 of the economizer 2 located at the bottom of the liquid reservoir 1;

[0058] The vaporization outlet 222 of the economizer 2 located at the bottom of the liquid reservoir 1 is connected to the air supply port of the compressor 3 through a return air pipeline, and a fluorine injection nozzle is provided on the return air pipeline; the subcooling outlet 212 of the economizer 2 on the right side of the liquid reservoir 1 supplies liquid to the evaporator through a subcooling pipeline.

[0059] The return air port of the compressor 3 is provided with a return air pipeline connected to the liquid outlet side of the evaporator, and the return air pipeline is provided with a vacuum valve 14, an air suction filter 66 and a straight-through stop valve 61 in sequence (from the compressor 3 to the evaporator side).

[0060] In addition, there are other pipelines and components in the figure. Since they are not closely related to the main invention points of the utility model and are the commonly used pipeline setting structures and component identifications of parallel screw units, they are fully identifiable and understood by those skilled in the art, so they are not explained one by one.

[0061] The utility model proposes a liquid storage type enthalpy-increasing heat exchange parallel screw unit system with a built-in economizer. A part is separated from the bottom of the liquid storage device to be used separately for heat exchange in the economizer, and an independent self-circulation system is formed with the economizer equipment. There is no pipeline loss in the system, thereby solving the problems of the high refrigerant temperature in the liquid storage device affecting the heat exchange effect under different working conditions and the difficulty in system control due to different air supply temperatures of the parallel units.

[0062] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0067] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A liquid reservoir structure, comprising: The liquid reservoir is characterized in that it also includes an economizer arranged in the liquid reservoir and located at the bottom of the liquid reservoir, a condenser interface is provided on the upper part of the liquid reservoir, and a shell-side liquid outlet connected to the inside of the liquid reservoir is provided on one side of the liquid reservoir; the economizer includes a subcooling flow path and a vaporization flow path for heat exchange with the subcooling flow path, and the inlet and outlet of the subcooling flow path and the vaporization flow path extend out of the liquid reservoir.

2. The liquid storage structure according to claim 1, characterized in that: The supercooling inlet of the supercooling flow path is arranged on one side of the liquid reservoir, and the supercooling outlet is arranged on the other side of the liquid reservoir, which is used to connect to the evaporator for liquid supply; the vaporization inlet and vaporization outlet of the vaporization flow path are arranged at the bottom of the liquid reservoir, wherein the vaporization outlet is used to connect to the compressor for air supply.

3. The liquid storage structure according to claim 1, characterized in that: The upper part of the liquid storage container is also provided with a plurality of interfaces, which are respectively provided with a safety valve, a filling valve and a vacuum valve.

4. The liquid storage structure according to claim 1, characterized in that: A balance port interface is also provided on the upper portion of the liquid storage device.

5. The liquid storage structure according to claim 2, characterized in that: The shell-side liquid outlet is connected to one end of a shell-side pipeline, and the other end of the shell-side pipeline is branched to form a first shell-side pipeline and a second shell-side pipeline. The first shell-side pipeline is connected to the subcooling inlet of the subcooling flow path, and the second shell-side pipeline is provided with a throttle valve and connected to the vaporization inlet of the vaporization flow path.

6. The liquid reservoir structure according to claim 1, characterized in that: The pipe diameter of the supercooling flow path is larger than the pipe diameter of the vaporizing flow path, and the pipe of the supercooling flow path is arranged in close contact with the pipe of the vaporizing flow path for heat exchange.

7. The liquid reservoir structure according to claim 1, characterized in that: A plurality of economizers are arranged at the bottom of the liquid storage tank.

8. An air conditioning unit, characterized in that: include: The liquid reservoir structure according to any one of claims 1 to 7.

9. The air conditioning unit according to claim 8, characterized in that: The air conditioning unit is a parallel screw unit.

10. The air conditioning unit according to claim 9, characterized in that: The parallel screw unit includes: the liquid storage tank, the evaporator, the condenser, a compressor corresponding to each of the economizers, and an oil separator connected to a plurality of the compressors.

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