Efficient low-pressure barrel pump refrigeration cycle system

Abstract

The utility model discloses an efficient low-pressure barrel pump refrigeration cycle system which comprises a low-pressure circulation barrel, an evaporation circulation mechanism and a refrigeration circulation mechanism, wherein the evaporation circulation mechanism and the refrigeration circulation mechanism are respectively connected with the low-pressure circulation barrel. According to the refrigeration cycle system, the problem of difficult oil return is solved, the economizer is adopted for air supply circulation, the efficiency of compression refrigeration cycle is improved, the refrigerating capacity is improved, the exhaust temperature of the centrifugal compressor is reduced, the energy consumption of equipment operation is effectively reduced, and the popularization and use value is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to refrigeration equipment technical field especially relates to a kind of efficient low-pressure bucket pump refrigeration cycle system. BACKGROUND

[0002] Conventional refrigeration system is short of pipeline, most lubricating oil is smoothly flowed back to compressor by refrigeration device, so it does not need to consider oil return problem. But multi-split system and low-temperature refrigeration system are long of pipeline (up to 125m), big of difference (up to 50m), many of elbow, many of oil storage place in system, difficult to return oil. With the increase of running time, more and more lubricating oil in system, compressor will be damaged due to lack of oil. Therefore, solving the problem of difficult oil return is an important condition to ensure normal operation of multi-split system and low-temperature refrigeration system.

[0003] To solve the above problems, Chinese patent (CN 221464045 U) discloses a kind of low-pressure bucket pump refrigeration cycle system, for early equipment of our company. It is found that its operation energy consumption is higher in actual use process, which brings great economic burden to user. Therefore, it is further improved to reduce the energy consumption of equipment. UTILITY MODEL CONTENTS

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide an efficient low-pressure bucket pump refrigeration cycle system, which solves the problem of difficult oil return, and adopts economizer to circulate air, improves the efficiency of compression refrigeration cycle, increases refrigerating capacity, reduces the exhaust temperature of centrifugal compressor, effectively reduces the energy consumption of equipment operation, and has high popularization value.

[0005] The utility model provides a kind of efficient low-pressure bucket pump refrigeration cycle system, comprising:

[0006] Low-pressure circulation bucket, which contains working medium;

[0007] Evaporation circulation mechanism, connected with the low-pressure circulation bucket, used to extract working medium to carry out refrigeration by evaporation, and circulate gaseous working medium back to the low-pressure circulation bucket; and

[0008] Refrigeration circulation mechanism, connected with the low-pressure circulation bucket, used to extract gaseous working medium to return to the low-pressure circulation bucket after condensation refrigeration;

[0009] Among them, the refrigeration circulation mechanism includes centrifugal compressor, condenser, liquid storage tank and economizer;

[0010] The input end of the centrifugal compressor is connected with the low-pressure circulation bucket, and the connection end is above the liquid level of working medium in the low-pressure circulation bucket, and the output end of the centrifugal compressor is connected to the low-pressure circulation bucket through the first hot gas bypass valve;

[0011] The input end of the condenser is connected with the output end of the centrifugal compressor, and the output end of the condenser is connected to the top of the liquid storage tank;

[0012] The bottom of the liquid storage tank is connected with a ball valve;

[0013] The first inlet of the economizer is connected with the ball valve, the first outlet is connected with the low-pressure circulation barrel through a first thrott valve, and the first thrott valve is connected with a second hot gas bypass valve in parallel; the second inlet of the economizer is connected with the ball valve through a second thrott valve, and the second outlet is connected to the centrifugal compressor.

[0014] Further, the economizer comprises a shell, a plurality of corrugated plates are arranged in the shell at equal intervals in the horizontal direction, the corrugated plates divide the shell into a plurality of first chambers and second chambers which are distributed at intervals, the first inlet is connected with the top of each first chamber in sequence, the first outlet is connected with the bottom of each first chamber in sequence, the second inlet is connected with the top of each second chamber in sequence, and the second outlet is connected with the bottom of each second chamber in sequence.

[0015] Further, the evaporation circulation mechanism comprises:

[0016] A liquid supply pump group, the input end of which is connected with the low-pressure circulation barrel, and the connecting end of the liquid supply pump group and the low-pressure circulation barrel is located below the liquid level of the working medium in the low-pressure circulation barrel;

[0017] An evaporator, the input end of which is connected with the output end of the liquid supply pump group, and the output end of which is connected with the low-pressure circulation barrel, and the connecting end of the evaporator and the low-pressure circulation barrel is located above the liquid level of the working medium in the low-pressure circulation barrel.

[0018] Further, the liquid supply pump group comprises a first pump group and a second pump group which are connected in parallel, the first pump group comprises a plurality of first liquid pumps which are connected in parallel, and the first pump group is provided with first valves at both ends, the second pump group comprises a plurality of second liquid pumps which are connected in parallel, and the second pump group is provided with second valves at both ends.

[0019] Further, the evaporation circulation mechanism comprises at least two groups of evaporators which are connected in parallel, and the input end of each evaporator is provided with an electronic liquid supply valve.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] (1) The refrigeration circulating system is provided with a low-pressure circulating barrel, an evaporation circulating mechanism and a refrigeration circulating mechanism; the evaporation circulating mechanism and the condensation circulating mechanism are separated by the low-pressure circulating barrel, so that the evaporation circulating mechanism as a terminal liquid supply system and the condensation circulating mechanism as a mechanical refrigeration system are in a stable working condition and are independently controlled, the refrigeration circulating system adopts a centrifugal compressor, so that the whole system does not need to consider oil return, effectively avoids the oil return problem caused by long pipelines and large drops, and does not need professional design and installation, thereby reducing installation cost.

[0022] (2) Part of the condensed working medium returns to the centrifugal compressor through the second throttling valve and the economizer, the working medium is evaporated and absorbs heat through throttling, so that another part of the working medium is supercooled. The economizer supplementing circulation improves the efficiency of the compression refrigeration cycle, increases the refrigerating capacity, reduces the exhaust temperature of the centrifugal compressor, effectively reduces the energy consumption of the equipment operation, and has high popularization and use value.

[0023] (3) The liquid supply pump group of the evaporation circulating mechanism is composed of a group of commonly used pump groups and a group of standby pump groups, so that the problem of system shutdown caused by liquid pump failure is avoided; the second hot gas bypass valve can adjust the operation mode of the system to meet the operation demand of the evaporation circulating mechanism; the output end of the centrifugal compressor is provided with the first hot gas bypass valve, which can adjust the pressure of the output end according to the demand to meet the demand of the system, and the safety of the system operation is high.

[0024] It should be understood that the content described in the content part of the utility model is not intended to limit the key or important features of the embodiments of the utility model, nor is it intended to limit the scope of the utility model. Other features of the utility model will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] Other features, objects and advantages of the utility model will become more apparent by reading the following detailed description of the non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 It is a structure schematic view of high-efficiency low-pressure barrel pump refrigeration circulating system;

[0027] Figure 2 It is a structure schematic view of economizer;

[0028] Figure 3 It is Figure 2 A cross-sectional structure schematic view of A-A in the middle;

[0029] Figure 4 It is Figure 2 A cross-sectional structure schematic view of B-B in the middle;

[0030] Figure 5 It is a structure schematic view of corrugated sheet.

[0031] Reference numerals in the drawings: 1, low-pressure circulation barrel; 2, evaporation circulation mechanism; 3, refrigeration circulation mechanism;

[0032] 21, liquid supply pump group; 22, evaporator; 23, electronic liquid supply valve;

[0033] 211, first liquid pump; 212, second liquid pump;

[0034] 31, centrifugal compressor; 32, condenser; 33, liquid storage tank; 34, economizer; 35, first hot gas bypass valve; 36, valve; 37, first throttle valve; 38, second hot gas bypass valve; 39, second throttle valve;

[0035] 341, shell; 342, corrugated sheet; 343, first chamber; 344, second chamber; 345, first inlet; 346, first outlet; 347, second inlet; 348, second outlet. DETAILED DESCRIPTION

[0036] The utility model will be explained in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description.

[0037] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be explained in further detail below in combination with the drawings and embodiments.

[0038] Reference numerals in the drawings: 1, low-pressure circulation barrel; 2, evaporation circulation mechanism; 3, refrigeration circulation mechanism; Figures 1-5 The embodiment of the utility model provides a kind of high-efficiency low-pressure barrel pump refrigeration circulation system, comprising:

[0039] Low-pressure circulation barrel 1, which is filled with working medium;

[0040] Evaporation circulation mechanism 2 is connected with low-pressure circulation barrel 1, for extracting working medium to carry out refrigeration by evaporating, and circulating gaseous working medium back to low-pressure circulation barrel 1; and

[0041] Refrigeration circulation mechanism 3 is connected with low-pressure circulation barrel 1, for extracting gaseous working medium to return to low-pressure circulation barrel 1 after condensing refrigeration;

[0042] Wherein, refrigeration circulation mechanism 3 includes centrifugal compressor 31, condenser 32, liquid storage tank 33 and economizer 34;

[0043] The input end of the centrifugal compressor 31 is connected with the low-pressure circulation barrel 1, and the connection end is located above the liquid level of the working medium in the low-pressure circulation barrel 1; the output end of the centrifugal compressor 31 is connected with the low-pressure circulation barrel 1 through the first hot gas bypass valve 35;

[0044] The input end of the condenser 32 is connected with the output end of the centrifugal compressor 31, and the output end of the condenser 32 is connected with the top of the liquid storage tank 33;

[0045] The bottom of the liquid storage tank 33 is connected with a ball valve 36;

[0046] The first inlet 345 of the economizer 34 is connected with the ball valve 36, the first outlet 346 is connected with the low-pressure circulation barrel 1 through the first throttling valve 37, and the first throttling valve 37 is connected with the second hot gas bypass valve 38 in parallel; the second inlet 347 of the economizer 34 is connected with the ball valve 36 through the second throttling valve 39, and the second outlet 348 is connected with the centrifugal compressor 31.

[0047] In the embodiment, the evaporation circulation mechanism 2 extracts the working medium to perform refrigeration by evaporating the working medium, and circulates the gaseous working medium back to the low-pressure circulation barrel 1, so as to realize the refrigeration cycle.

[0048] The gaseous working medium in the low-pressure circulation barrel 1 is extracted by the centrifugal compressor 31, and is injected into the condenser 32 to be condensed. The condensed working medium enters the liquid storage tank 33 to be collected,

[0049] Part of the working medium is throttled by the second throttling valve 39 to enter the economizer 34, so that another part of the working medium is supercooled and returned to the centrifugal compressor 31, thereby improving the working efficiency of the centrifugal compressor 31; another part of the working medium is supercooled and then throttled by the first throttling valve 37 to be circulated back to the low-pressure circulation barrel 1.

[0050] In some cases, the temperature of the working medium cooled by the condenser 32 reaches the temperature required for the evaporation cycle, and at this time, the second hot gas bypass valve 38 can be directly connected to the low-pressure circulation barrel 1 to reduce the pipe resistance of the system.

[0051] The refrigeration cycle system of the application separates the evaporation circulation mechanism 2 and the condensation circulation mechanism 3 by the low-pressure circulation barrel 1, so that the evaporation circulation mechanism 2 as a terminal liquid supply system and the condensation circulation mechanism 3 as a mechanical refrigeration system are in a stable working condition and are independently controlled, so that the entire system no longer considers the oil return problem, effectively avoids the oil return problem caused by long pipelines and large drops, and ensures the safety of the system operation; without the need for professional design and installation, the installation cost is reduced.

[0052] The economizer 34 is used for supplementing and circulating the gas, which improves the efficiency of the compression refrigeration cycle, increases the refrigerating capacity, reduces the exhaust temperature of the centrifugal compressor 31, effectively reduces the energy consumption of the equipment operation, and has high popularization and application value.

[0053] In a preferred embodiment, as shown in Figures 2-5 The economizer 34 comprises a housing 341, and a plurality of corrugated sheets 342 are arranged in the housing 341 at equal intervals in the horizontal direction, and the corrugated sheets 342 divide the housing 341 into a plurality of first chambers 343 and second chambers 344 arranged at intervals. A first inlet 345 is connected to the top of each first chamber 343 in sequence, a first outlet 346 is connected to the bottom of each first chamber 343 in sequence, a second inlet 347 is connected to the top of each second chamber 344 in sequence, and a second outlet 348 is connected to the bottom of each second chamber 344 in sequence.

[0054] In the embodiment, the working medium output by the liquid storage tank 33 is divided into two paths after passing through the ball valve 36 and entering the economizer 34. The first path directly enters each first chamber 343 through the first inlet 345, and the second path enters each second chamber 344 through the second inlet 347 after being throttled and cooled by the second throttle valve 39. The working medium in the two paths exchanges heat. The corrugated sheets 342 have a large contact area with the working medium, which improves the heat exchange efficiency. The first path of the working medium is supercooled, and then is depressurized and cooled by the first throttle valve 37 and then recycled back to the low-pressure circulation barrel 1. The first path of the working medium returns to the centrifugal compressor 31. The arrangement of the economizer 34 effectively improves the operating efficiency of the system and reduces energy consumption, and the economy is more excellent.

[0055] In a preferred embodiment, as shown in Figure 1 The evaporation circulation mechanism 2 comprises:

[0056] A liquid supply pump set 21, the input end of which is connected to the low-pressure circulation barrel 1, and the connection end of the liquid supply pump set 21 to the low-pressure circulation barrel 1 is below the liquid level of the working medium in the low-pressure circulation barrel 1;

[0057] An evaporator 22, the input end of which is connected to the output end of the liquid supply pump set 21, and the output end of which is connected to the low-pressure circulation barrel 1, and the connection end of the evaporator 22 to the low-pressure circulation barrel 1 is above the liquid level of the working medium in the low-pressure circulation barrel 1.

[0058] In the embodiment, the working medium in the low-pressure circulation barrel 1 is extracted by the liquid supply pump set 21 and sent to the evaporator 22, and refrigeration is performed by heat absorption of evaporation of the working medium. The evaporated working medium enters the low-pressure circulation barrel 1 in a gaseous state, realizing a refrigeration cycle.

[0059] In a preferred embodiment, as shown in Figure 1 The liquid supply pump set 21 comprises a first pump set and a second pump set connected in parallel. The first pump set comprises a plurality of first liquid pumps 211 connected in parallel, and first valves are arranged at both ends of the first pump set. The second pump set comprises a plurality of second liquid pumps 212 connected in parallel, and second valves are arranged at both ends of the second pump set.

[0060] In the embodiment, the first pump group is used as a normal pump group to extract the working medium in the low-pressure circulation barrel 1, and the second pump group is used as a standby pump group. When the first pump group fails, the first valve is closed and the second valve is opened, and the second pump group is operated to ensure the normal operation of the refrigeration circulation system.

[0061] In a preferred embodiment, as shown in Figure 1 The evaporation circulation mechanism 2 includes at least two groups of evaporators 22 connected in parallel, and each evaporator 22 is provided with an electronic liquid supply valve 23 to control the flow of working medium entering the evaporator 22.

[0062] Working principle:

[0063] When the system is started, the first liquid pump 211, the electronic liquid supply valve 23, the centrifugal compressor 31, the condenser 32, the first throttling valve 36, and the second throttling valve 38 are opened, and the system operates in a mechanical refrigeration state.

[0064] The first liquid pump 211 extracts the liquid working medium (working medium) in the low-pressure circulation barrel 1, and delivers it to the evaporator 22 through the electronic liquid supply valve 23. The evaporator 22 is in contact with a high-temperature heat source, and the liquid working medium absorbs heat from the high-temperature heat source in the evaporator 22 and evaporates into gas. The gas formed by evaporation enters the low-pressure circulation barrel 1 for gas-liquid separation.

[0065] At the same time, the gaseous working medium in the low-pressure circulation barrel 1 is extracted and compressed by the centrifugal compressor 31 into high-temperature and high-pressure gas and delivered to the condenser 32. The high-temperature and high-pressure gaseous working medium releases heat in the condenser 32 and becomes liquid working medium after condensation and enters the liquid storage tank 33. Then part of it is throttled and decompressed by the economizer 34 and the first throttling valve 37 and returns to the low-pressure circulation barrel 1 for the next cycle; the other part is cooled by the second throttling valve 39 and the economizer 34 and returns to the centrifugal compressor 31, improving the working efficiency of the centrifugal compressor 31 and increasing the refrigerating capacity of the system to achieve energy saving. Such a cycle is repeated to complete the transfer process of heat absorption and release in the mechanical refrigeration mode.

[0066] In the description of the present specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the description of the application, the terms "one embodiment", "some embodiments", "an embodiment", "one specific embodiment", "some specific embodiments", and the like, can mean the same or similar thing, i.e., one or more embodiments or examples. By way of illustration, all of the above terms, i.e., "one embodiment", "some embodiments", "an embodiment", "one specific embodiment", "some specific embodiments", and the like, can mean one implementation so that there can be a variety of embodiments or examples. Also, the terms "first", "second", "third", etc., can be used herein to describe various embodiments or examples and do not need to have an ordering in time and / or space, but are used for distinguishing between various embodiments or examples. The terms "first", "second", "third", etc., are therefore also interchangeable in the context of the specification. The designation of a specific feature as being a "first", "second", "third", etc., feature within a claim does not imply that the one feature is necessarily the only feature of that type within that claim.

[0068] The preferred embodiments of the application are described above in detail. The application, however, is not limited to the precise construction that has been described above. Any modification of the above described embodiment or any alternative embodiments can be effected without departing from the spirit and scope of the application.

Claims

1. A high efficiency low pressure barrel pump refrigeration cycle system characterized by, The application relates to a refrigeration cycle device, which comprises the following parts: a low-pressure circulating barrel (1) containing working medium; an evaporation circulating mechanism (2) connected with the low-pressure circulating barrel (1) and used for extracting working medium to perform refrigeration by evaporating the working medium and circulating the gaseous working medium back to the low-pressure circulating barrel (1); and a refrigeration circulating mechanism (3) connected with the low-pressure circulating barrel (1) and used for extracting the gaseous working medium to return to the low-pressure circulating barrel (1) after condensation refrigeration. The refrigeration circulating mechanism (3) comprises a centrifugal compressor (31), a condenser (32), a liquid storage tank (33) and an economizer (34). The input end of the centrifugal compressor (31) is connected with the low-pressure circulating barrel (1), and the connecting end is located above the liquid level of the working medium in the low-pressure circulating barrel (1); the output end of the centrifugal compressor (31) is connected with the low-pressure circulating barrel (1) through a first hot gas bypass valve (35). The input end of the condenser (32) is connected with the output end of the centrifugal compressor (31), and the output end of the condenser (32) is connected with the top of the liquid storage tank (33). The bottom of the liquid storage tank (33) is connected with a ball valve (36). The first inlet (345) of the economizer (34) is connected with the ball valve (36), the first outlet (346) is connected with the low-pressure circulating barrel (1) through a first throttling valve (37), and the first throttling valve (37) is connected with a second hot gas bypass valve (38) in parallel; the second inlet (347) of the economizer (34) is connected with the ball valve (36) through a second throttling valve (39), and the second outlet (348) is connected with the centrifugal compressor (31).

2. The high efficiency low pressure barrel pump refrigeration cycle system of claim 1, wherein, The economizer (34) comprises a shell (341), a plurality of corrugated plates (342) are arranged in the shell (341) at equal intervals in the horizontal direction, the corrugated plates (342) divide the shell (341) into a plurality of first chambers (343) and second chambers (344) which are distributed at intervals, the first inlet (345) is connected with the top of each first chamber (343) in sequence, the first outlet (346) is connected with the bottom of each first chamber (343) in sequence, the second inlet (347) is connected with the top of each second chamber (344) in sequence, and the second outlet (348) is connected with the bottom of each second chamber (344) in sequence.

3. The high efficiency low pressure barrel pump refrigeration cycle system of claim 1, wherein, The evaporation circulating mechanism (2) comprises: a liquid supply pump group (21) whose input end is connected with the low-pressure circulating barrel (1), and the connecting end of the liquid supply pump group (21) is located below the liquid level of the working medium in the low-pressure circulating barrel (1); an evaporator (22) whose input end is connected with the output end of the liquid supply pump group (21), and whose output end is connected with the low-pressure circulating barrel (1), and the connecting end of the evaporator (22) is located above the liquid level of the working medium in the low-pressure circulating barrel (1).

4. The high efficiency low pressure barrel pump refrigeration cycle system of claim 3, wherein, The liquid supply pump group (21) comprises a first pump group and a second pump group in parallel, the first pump group comprises a plurality of first liquid pumps (211) in parallel, two ends of the first pump group are respectively provided with first valves, and the second pump group comprises a plurality of second liquid pumps (212) in parallel, two ends of the second pump group are respectively provided with second valves.

5. The high efficiency low pressure barrel pump refrigeration cycle system of claim 3, wherein, The evaporation circulation mechanism (2) comprises at least two groups of the evaporators (22) in parallel, and the input ends of the evaporators (22) are respectively provided with electronic liquid supply valves (23).

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