CN215983299U

CN215983299U - Prying block type double-machine two-stage screw refrigerating compressor unit

Info

Publication number: CN215983299U
Application number: CN202122534523.2U
Authority: CN
Inventors: 熊侃; 龚本; 张天云; 罗飞; 王洁
Original assignee: WUHAN NEW WORLD REFRIGERATION INDUSTRIAL CO LTD
Current assignee: WUHAN NEW WORLD REFRIGERATION INDUSTRIAL CO LTD
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-03-08
Anticipated expiration: 2031-10-20

Abstract

The utility model discloses a skid-block type double-machine two-stage screw refrigerating compressor unit, which comprises a low-pressure-stage screw refrigerating compressor, a high-pressure-stage screw refrigerating compressor, an oil separator, an oil cooler, a condenser, an intercooler, an economizer, an evaporator and other components, and further comprises a main machine skid base and an auxiliary machine skid base; a low-pressure-level screw refrigerating compressor and a first driving motor thereof, a high-pressure-level screw refrigerating compressor and a second driving motor thereof, an oil separator, an oil cooler, an intercooler and an economizer are arranged and mounted on a base of the main machine prying block. A condenser and an evaporator are arranged and mounted on the auxiliary machine prying block base; the main machine prying block base and the auxiliary machine prying block base are detachably connected into a whole through bolt fasteners. The modular integrated processing of the components of the whole machine has the characteristics of convenience and easiness in assembly, short and short pipeline arrangement, more compact structure and the like, can reduce the vibration risk of the unit, improves the operation stability of the unit, and is particularly suitable for large-scale screw refrigeration compressor units.

Description

Prying block type double-machine two-stage screw refrigerating compressor unit

Technical Field

The utility model relates to a screw refrigeration compressor unit, in particular to a skid-type double-machine double-stage screw refrigeration compressor unit.

Background

The double-machine two-stage screw refrigerating compressor unit mainly comprises a low-pressure stage screw refrigerating compressor, a high-pressure stage screw refrigerating compressor, an oil separator, an oil cooler, an intercooler, an economizer, a condenser, an evaporator and other parts, wherein the parts are connected through corresponding pipelines, valves, conveying pumps and control elements. Wherein: the low-pressure screw refrigeration compressor is connected with the first driving motor through the first coupler, and the high-pressure screw refrigeration compressor is connected with the second driving motor through the second coupler.

The working principle is as follows: the low-pressure stage screw refrigerating compressor sucks in low-pressure refrigerant steam from an evaporator, the low-pressure refrigerant steam is discharged to the high-pressure stage screw refrigerating compressor after being compressed, an oil-gas mixture is input into an oil separator for separation after being compressed again, the separated refrigerant steam flows to a condenser, the refrigerant steam is condensed into refrigerant liquid through cooling water and then flows to an intercooler and an economizer for secondary supercooling, the high-pressure refrigerant liquid after secondary supercooling enters an evaporator after being throttled through an electromagnetic valve and a throttle valve to absorb the heat of secondary refrigerant liquid for boiling evaporation, and the obtained refrigerant steam is sucked by the low-pressure stage screw refrigerating compressor to finish refrigerating circulation. And the separated lubricating oil enters an oil cooler and is cooled and then conveyed to the low-pressure screw refrigeration compressor and the high-pressure screw refrigeration compressor again for cyclic utilization.

In a traditional double-machine two-stage screw refrigerating compressor unit, an oil separator is of a horizontal cylinder structure, a low-pressure stage compressor support and a first motor support are arranged at the top of a cylinder of the oil separator, and a low-pressure stage screw refrigerating compressor and a first driving motor are respectively arranged on the low-pressure stage compressor support and the first motor support; the oil cooler is of a horizontal shell and tube structure, a high-pressure compressor support and a second motor support are arranged at the top of a cylinder body of the oil cooler, and a high-pressure screw refrigeration compressor and a second driving motor are respectively placed on the high-pressure compressor support and the second motor support. The oil separator and the oil cooler share one oil separator lower support, an oil line system matched with the oil separator is externally hung on a cylinder body of the oil separator, and the intercooler and the economizer are arranged between the oil separator and the oil cooler through support angle steel.

Although the arrangement structure is compact and small in occupied area, the arrangement structure is only suitable for small double-machine double-stage screw refrigeration compressor sets. For a large double-machine double-stage screw refrigerating compressor unit, a larger motor needs to be used for driving, particularly a second driving motor for driving a high-pressure-stage screw refrigerating compressor, and because the dead weight of the motor is increased, the support strength of the top of an oil separator cylinder and the top of an oil cooler cylinder is insufficient, the vibration of the motor is easily aggravated, and the stable operation of the unit is further influenced; moreover, these bearings drag the oil separator and oil cooler cartridges during repeated shaking, which is prone to risk of container failure and leakage. In addition, in the arrangement structure, the oil separator and the oil cooler share one oil separator lower support and are separately fixed on a foundation together with a compressor unit component on the oil separator lower support, and other matched containers such as an evaporator, a condenser and the like need to be separately placed on another foundation and need to be provided with connecting pipelines on site, so that the pipeline arrangement structure tends to be complex, the installation procedures are multiple, the labor intensity of workers is increased, and the unit production cost is increased.

How to ensure the high-efficiency low-cost stable operation of a large double-machine double-stage screw refrigeration compressor unit is always a problem to be solved urgently by technical personnel in the field, but a satisfactory progress is not achieved at present.

Disclosure of Invention

The utility model aims to provide a prying block type double-machine double-stage screw refrigerating compressor unit which is integrated in a modularized manner, convenient and easy to assemble, short and short in pipeline arrangement, more compact in structure, capable of reducing vibration risks and improving operation stability.

In order to achieve the purpose, the skid block type double-machine double-stage screw refrigeration compressor unit comprises a low-pressure stage screw refrigeration compressor, a high-pressure stage screw refrigeration compressor, an oil separator, an oil cooler, a condenser, an intercooler, an economizer and an evaporator, wherein the low-pressure stage screw refrigeration compressor, the high-pressure stage screw refrigeration compressor, the oil separator, the oil cooler, the condenser, the intercooler, the economizer and the evaporator are connected through a pipeline, a valve, a conveying pump and a control element. It is characterized in that: the device also comprises a main engine prying block base and an auxiliary engine prying block base; a low-pressure-level screw refrigerating compressor and a first driving motor thereof, a high-pressure-level screw refrigerating compressor and a second driving motor thereof, an oil separator, an oil cooler, an intercooler and an economizer are arranged and mounted on the main machine prying block base. A condenser and an evaporator are arranged and mounted on the auxiliary machine prying block base; the main machine prying block base and the auxiliary machine prying block base are detachably connected into a whole through a bolt fastener, so that a prying block type double-machine double-stage screw refrigerating compressor unit is formed.

As a preferred scheme, the low-pressure-level screw refrigeration compressor and a first driving motor thereof, the high-pressure-level screw refrigeration compressor and a second driving motor thereof are arranged in parallel and are arranged on one side of a base of a main machine prying block; the oil cooler, the intercooler and the economizer are respectively arranged and installed on the other side of the base of the main machine prying block; the oil separator is arranged and installed in the middle of the base of the main engine prying block. Therefore, all parts are uniformly and reasonably distributed, the pipeline connection is short and stable, and the unit structure is more compact.

Further, the low-pressure stage screw refrigeration compressor and the first driving motor thereof are respectively fixedly installed on the main machine prying block base through a low-pressure stage compressor support and a first motor support; and the high-pressure stage screw refrigeration compressor and a second driving motor thereof are respectively installed and fixed on the main machine prying block base through a high-pressure stage compressor support and a second motor support. Therefore, the height of the support of each component is generally reduced, the strength and the rigidity of the support are greatly improved, vibration and noise generated when the unit operates can be effectively reduced, and stable operation of the unit is ensured. Meanwhile, the support is completely separated from the oil separator, the oil cooler and other pressure vessels, so that the damage of electromechanical vibration to the pressure vessel barrel can be effectively avoided, and the risk of vessel failure and leakage is avoided.

Furthermore, the oil separator is of a vertical structure, a combined separation element is arranged in an inner cavity of the oil separator, a mixed medium inlet of the oil separator is arranged on one side of the bottom of the oil separator, a lubricating oil outlet of the oil separator is arranged on the other side of the bottom of the oil separator, the position of the mixed medium inlet of the oil separator is higher than the position of the lubricating oil outlet, and a refrigerant outlet of the oil separator is arranged on the top of the oil separator. Therefore, the vertical oil separator is simple and practical in structure, the occupied area of the vertical oil separator is far smaller than that of a horizontal oil separator, the vertical height difference between the bottom and the top of the vertical cylinder can be utilized, the distance between a mixed medium inlet and a refrigerant outlet of the oil separator is increased to the maximum extent, and the gravity separation effect of the oil separator is improved. Meanwhile, the lubricating oil with higher specific gravity can be smoothly discharged through the lubricating oil outlet with lower position after being separated out, and the mixture of the refrigerant gas and the lubricating oil can be prevented from entering the lubricating oil outlet by mistake.

Still further, the oil cooler is plate structure, the heat transfer board in the oil cooler inner chamber is removable structure, the cold oil export of oil cooler is provided with oily thermostatic valve. Therefore, the oil cooler can be conveniently detached and cleaned when the unit is needed, and the oil supply temperature can be guaranteed to be stabilized in the optimal range required by normal operation of the unit.

Still further, the evaporimeter is thermosiphon evaporimeter, and it includes evaporation barrel and drum barrel, the evaporation barrel is horizontal to be installed on auxiliary engine sled piece base, the condenser is through self bearing installation on the evaporation barrel, the drum barrel supports the top at the condenser through the pipeline that links to each other with evaporation barrel. Therefore, the evaporator and the condenser on the auxiliary machine prying block base can be more compact and reasonable in layout, and the occupied space is less.

The utility model has the following advantages: one of them, with the integration of all parts of two-machine doublestage screw rod refrigeration compressor unit on host computer sled piece base and auxiliary engine sled piece base, and two sled piece bases pass through bolted fastener and connect and dismantle, can make each part equipment nimble more convenient, the overall arrangement is compacter reasonable, and the connecting tube between each part is shorter more, and then simplifies the installation procedure, alleviates workman intensity of labour. And secondly, a low-pressure-level screw refrigerating compressor and a first driving motor thereof, a high-pressure-level screw refrigerating compressor and a second driving motor thereof are installed on a base of a prying block of the main machine, so that the installation gravity center of the unit can be greatly reduced, the defect that the support strength is insufficient when the unit is installed on an oil separator and an oil cooler is avoided, the motor vibration aggravation is effectively prevented, and the unit is ensured to operate stably all the time. Thirdly, the oil separator is designed to be of a vertical structure, the gravity separation effect of the oil separator is greatly improved compared with that of a horizontal state, the separation effect of the oil separator can be enhanced, and the occupied area can be greatly reduced; in addition, the oil separator does not bear the load of the compressor and the motor any longer, and the wall thickness of the cylinder body can be reduced as much as possible, so that the manufacturing cost can be reduced. In conclusion, the utility model is particularly suitable for large-scale double-machine double-stage screw refrigeration compressor units, and can ensure the high-efficiency, low-cost and stable operation of the units.

Drawings

Fig. 1 is a schematic view of a connection structure of a prying block type double-machine double-stage screw refrigeration compressor unit of the utility model.

Fig. 2 is a schematic perspective view of the skid-type dual-machine twin-stage screw refrigeration compressor unit shown in fig. 1.

The components in the figures are numbered as follows: the system comprises a low-pressure stage screw refrigeration compressor 1, a first coupler 2, a first driving motor 3, a high-pressure stage screw refrigeration compressor 4, a second coupler 5, a second driving motor 6, an oil separator 7, an oil cooler 8 (wherein, an oil thermostatic valve 8.1), a condenser 9, an intercooler 10, an economizer 11 and an evaporator 12 (wherein, an evaporation cylinder 12.1 and a steam drum 12.2).

Detailed Description

The utility model is described in further detail below with reference to the figures and specific examples, which should not be construed as limiting the utility model.

As shown in fig. 1 to 2, the skid-block type dual-machine dual-stage screw refrigeration compressor set described in this embodiment is mainly composed of a low-pressure stage screw refrigeration compressor 1, a high-pressure stage screw refrigeration compressor 4, an oil separator 7, an oil cooler 8, a condenser 9, an intercooler 10, an economizer 11, an evaporator 12 and other components connected by a pipeline, a valve, a delivery pump and a control element, wherein: low-pressure stage screw rod compressor 1 links to each other with first driving motor 3 through first shaft coupling 2, and high-pressure stage screw rod compressor 4 links to each other with second driving motor 6 through second shaft coupling 5.

The air suction end of the low-pressure stage screw refrigeration compressor 1 and the air suction end of the high-pressure stage screw refrigeration compressor 4 are both connected with the refrigerant output end of the evaporator 12, the air exhaust port of the low-pressure stage screw refrigeration compressor 1 is connected with the air suction port of the high-pressure stage screw refrigeration compressor 4, and the air exhaust port of the high-pressure stage screw refrigeration compressor 4 is connected with the mixed medium inlet of the oil separator 7. The refrigerant outlet of the oil separator 7 is connected to the refrigerant inlet of the condenser 9, and the refrigerant outlet of the condenser 9 is connected to the refrigerant input of the evaporator 12 through the intercooler 10 and the economizer 11 in this order. And a lubricating oil outlet of the oil separator 7 is connected with a hot oil inlet of an oil cooler 8, and a cold oil outlet of the oil cooler 8 is respectively connected with oil spray ports of the low-pressure-level screw refrigeration compressor 1 and the high-pressure-level screw refrigeration compressor 4.

The components are arranged on a main engine prying block base 13 and an auxiliary engine prying block base 14 in two large modules. Wherein: a low-pressure stage screw refrigeration compressor 1 and a first driving motor 3 thereof, a high-pressure stage screw refrigeration compressor 4 and a second driving motor 6 thereof, an oil separator 7, an oil cooler 8, an intercooler 10 and an economizer 11 are arranged and mounted on a main machine prying block base 13. The condenser 9 and the evaporator 12 are arranged and mounted on the auxiliary pry block base 14. The main machine prying block base 13 and the auxiliary machine prying block base 14 are detachably connected into a whole through bolt fasteners.

Specifically, the low-pressure-level screw refrigeration compressor 1 and the first driving motor 3 thereof, the high-pressure-level screw refrigeration compressor 4 and the second driving motor 6 thereof are arranged in parallel on one side of the main machine prying block base 13; the oil cooler 8, the intercooler 10 and the economizer 11 are respectively arranged and installed on the other side of the main machine prying block base 13; the oil separator 7 is arranged and mounted in the middle of the main machine pry block base 13.

In more detail, the low-pressure stage screw refrigeration compressor 1 and the first driving motor 3 thereof are respectively fixed on the main machine prying block base 13 through a low-pressure stage compressor support and a first motor support. The high-pressure stage screw refrigeration compressor 4 and the second driving motor 6 thereof are respectively installed and fixed on the main machine prying block base 13 through a high-pressure stage compressor support and a second motor support. Because the support direct mount is on the sled piece, its height reduces by a wide margin, and intensity and stability promote by a wide margin, can effectively reduce vibrations and noise when the unit moves. Because the support is completely separated from other pressure vessels, the damage of electromechanical vibration to the vessel cylinder is avoided, and the safe operation of the unit is ensured.

In this embodiment, the oil separator 7 is a vertical structure, a combined separation element is arranged in an inner cavity of the oil separator 7, the combined separation element adopts a stainless steel wire mesh and a polymer material filter core which are arranged at intervals from bottom to top, a mixed medium inlet of the oil separator 7 is arranged at one side of the bottom of the oil separator, a lubricating oil outlet of the oil separator 7 is arranged at the other side of the bottom of the oil separator, the mixed medium inlet of the oil separator 7 is higher than the lubricating oil outlet, and a refrigerant outlet of the oil separator 7 is arranged at the top of the oil separator. Considering the influence of gravity on the oil separation effect, the vertical oil separator 7 has better effect than the horizontal oil separator.

In this embodiment, the oil cooler 8 adopts a plate structure, the heat exchange plate in the inner cavity of the oil cooler 8 is of a detachable structure, and an oil thermostatic valve 8.1 is arranged at a cold oil outlet of the oil cooler 8 so as to ensure that the temperature of oil supply is stabilized in the optimal range required by the normal operation of the unit.

In this embodiment, the evaporator 12 is a thermosiphon evaporator, and includes an evaporation cylinder 12.1 and a drum cylinder 12.2, the evaporation cylinder 12.1 is horizontally mounted on an auxiliary machine skid base 14, the condenser 9 is mounted on the evaporation cylinder 12.1 through a support, and the drum cylinder 12.2 is supported above the condenser 9 through a pipeline connected with the evaporation cylinder 12.1. The condenser 9 is embedded between the evaporation cylinder 12.1 of the evaporator 12 and the steam drum 12.2, so that the layout of components on the auxiliary machine prying block base 14 is more compact and reasonable, and the occupied space is minimum.

During assembly, the skid-block type double-machine double-stage screw refrigeration compressor set is formed by correspondingly installing each part on the two skid-block bases in a production workshop or a construction site, and connecting the two skid-block bases into a whole through bolt fasteners. The working process is as follows: the first driving motor 3 drives the low-pressure stage screw refrigerating compressor 1 through the first coupler 2, and the second driving motor 6 drives the high-pressure stage screw refrigerating compressor 4 through the second coupler 5, so that two-stage compression of refrigerant working media is realized. The low-pressure stage screw refrigeration compressor 1 sucks in low-pressure refrigerant steam from the evaporator 12, compresses the low-pressure refrigerant steam and discharges the low-pressure refrigerant steam to the high-pressure stage screw refrigeration compressor 4, and after the low-pressure stage screw refrigeration compressor compresses the low-pressure refrigerant steam again, the oil-gas mixture is input into the oil separator 7 with the vertical structure for separation.

Stainless steel wire meshes and high polymer material filter cores which are arranged from bottom to top at intervals are arranged in the inner cavity of the oil separator 7 so as to carry out multi-stage separation on oil-gas mixtures. After the high-speed oil-gas mixture enters the oil separator 7, the high-speed oil-gas mixture firstly slightly collides with the baffle downwards, a large amount of lubricating oil mixed in the refrigerant gas is separated through collision, then the oil-gas mixture vertically flows upwards along the cylinder body of the oil separator 7, lubricating oil droplets are further separated through the action of gravity, and then the oil-gas mixture sequentially passes through the stainless steel wire plate mesh and the high polymer material filter element, and finally the residual lubricating oil is separated.

Refrigerant steam separated from the top of the oil separator 7 flows into a condenser 9 on an auxiliary machine pry block base 14 through an exhaust pipe, is condensed into refrigerant liquid through cooling water, then flows to an intercooler 10 and an economizer 11 to be subcooled for the second time, high-pressure refrigerant liquid after secondary subcooling is throttled through an electromagnetic valve and a throttle valve and then enters an evaporator 12 to absorb heat of refrigerant carrier liquid to be boiled and evaporated, and the obtained refrigerant steam is sucked by the low-pressure-level screw refrigeration compressor 1 to finish refrigeration cycle.

The lubricating oil separated from the bottom of the oil separator 7 enters the oil cooler 8 with a plate structure for cooling, and the oil thermostatic valve 8.1 arranged at the cold oil outlet of the oil cooler 8 can stabilize the oil supply temperature in the optimal range for normal operation of the unit. And finally, delivering the cooled constant-temperature lubricating oil to the low-pressure stage screw refrigeration compressor 1 and the high-pressure stage screw refrigeration compressor 4 again through an oil line pipe system to complete oil line circulation.

In summary, by means of the technical scheme of the utility model, the components of the double-machine double-stage screw refrigeration compressor unit can be modularly integrated into a whole, so that the pipeline connection is shorter, the structural layout is more compact, and the field assembly is easier. Meanwhile, the vibration risk of the unit can be reduced, the operation safety of the unit is improved, the service life of the unit is prolonged, and the device is particularly suitable for the high-efficiency low-cost stable operation of a large double-unit double-stage screw refrigeration compressor unit.

The above description is only exemplary of the present invention and should not be taken as limiting the utility model, as any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A skid-block type double-machine double-stage screw refrigerating compressor unit comprises a low-pressure stage screw refrigerating compressor (1), a high-pressure stage screw refrigerating compressor (4), an oil separator (7), an oil cooler (8), a condenser (9), an intercooler (10), an economizer (11) and an evaporator (12) which are connected with a control element through a pipeline, a valve and a delivery pump, wherein the low-pressure stage screw refrigerating compressor (1) is connected with a first driving motor (3) through a first coupler (2), and the high-pressure stage screw refrigerating compressor (4) is connected with a second driving motor (6) through a second coupler (5); the method is characterized in that:

the skid-mounted type crane further comprises a main engine skid base (13) and an auxiliary engine skid base (14); a low-pressure-stage screw refrigeration compressor (1) and a first driving motor (3) thereof, a high-pressure-stage screw refrigeration compressor (4) and a second driving motor (6) thereof, an oil separator (7), an oil cooler (8), an intercooler (10) and an economizer (11) are arranged and mounted on the main machine prying block base (13); a condenser (9) and an evaporator (12) are arranged and mounted on the auxiliary machine pry block base (14); the main machine prying block base (13) and the auxiliary machine prying block base (14) are detachably connected into a whole through bolt fasteners.

2. The skid-type dual-machine dual-stage screw refrigeration compressor unit according to claim 1, wherein: the low-pressure stage screw refrigeration compressor (1) and a first driving motor (3) thereof, the high-pressure stage screw refrigeration compressor (4) and a second driving motor (6) thereof are arranged in parallel on one side of a main machine prying block base (13); the oil cooler (8), the intercooler (10) and the economizer (11) are respectively arranged and mounted on the other side of the main machine prying block base (13); the oil separator (7) is arranged and installed in the middle of the main engine prying block base (13).

3. The skid-type dual-machine dual-stage screw refrigeration compressor unit according to claim 2, wherein: the low-pressure stage screw refrigeration compressor (1) and the first driving motor (3) thereof are respectively fixedly arranged on the main machine prying block base (13) through a low-pressure stage compressor support and a first motor support; the high-pressure stage screw refrigeration compressor (4) and the second driving motor (6) thereof are respectively installed and fixed on the main machine prying block base (13) through the high-pressure stage compressor support and the second motor support.

4. The skid-type dual-machine dual-stage screw refrigeration compressor unit according to claim 2, wherein: the oil separator (7) is of a vertical structure, a combined separation element is arranged in an inner cavity of the oil separator (7), a mixed medium inlet of the oil separator (7) is arranged on one side of the bottom of the oil separator, a lubricating oil outlet of the oil separator (7) is arranged on the other side of the bottom of the oil separator, the mixed medium inlet of the oil separator (7) is higher than the lubricating oil outlet, and a refrigerant outlet of the oil separator (7) is arranged on the top of the oil separator.

5. The skid-type dual-machine dual-stage screw refrigeration compressor unit according to claim 2, wherein: the oil cooler (8) is of a plate structure, the heat exchange plate in the inner cavity of the oil cooler (8) is of a detachable structure, and an oil thermostatic valve (8.1) is arranged at a cold oil outlet of the oil cooler (8).

6. The skid-type double-machine double-stage screw refrigeration compressor unit according to any one of claims 2 to 5, wherein: evaporimeter (12) are thermosiphon evaporimeter, and it includes evaporation barrel (12.1) and drum barrel (12.2), evaporation barrel (12.1) are horizontal to be installed on auxiliary engine sled piece base (14), condenser (9) are installed on evaporation barrel (12.1) through self support, drum barrel (12.2) are supported in the top of condenser (9) through the pipeline that links to each other with evaporation barrel (12.1).