An ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control

Abstract

The present invention provides an ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control, which relates to the technical field of heat pump units, including a compressor, wherein the compressor outlet is connected to an oil separator, and the refrigerant outlet of the oil separator is sequentially connected to a condenser, a filter, an expansion valve, and an evaporator and is refluxed and connected to the compressor to form a refrigeration cycle system; the lubricating oil outlet of the oil separator is sequentially connected to a throttle valve, an oil tank, an oil pump, an oil filter, and an oil cooler and is connected to the compressor and a compressor motor to form a lubricating oil circulation system; in the present application, when the lubricating oil containing a small amount of refrigerant coming out of the oil separator is depressurized through the throttle valve and enters the oil-gas separation component, the refrigerant gas after separation comes out from the exhaust through hole and then flows back to the return air side of the compressor through the return air pipe, and the liquid oil will fall from the oil drop pipe to the inside of the oil tank, thereby realizing the secondary separation of oil and refrigerant, thereby increasing the purity of the lubricating oil and ensuring the lubrication effect on the compressor bearings and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump units, and in particular to an ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control. Background Art

[0002] Heat pump units are highly efficient energy conversion equipment that use high-level energy to make heat flow from low-level heat sources to high-level heat sources. Ultra-high temperature heat pumps can use customers' low-temperature waste heat as a heat source to prepare the high-temperature heat source (water, steam, etc.) required by customers, replacing customers' original high-temperature heat sources (high-temperature steam, electric heating, etc.), achieving the effect of energy recovery and energy saving and emission reduction.

[0003] During the operation of the heat pump unit, lubricating oil is needed to lubricate the compressor to reduce friction and wear. The exhaust gas of the compressor carries a certain amount of lubricating oil mixed with gaseous refrigerant, which needs to be effectively separated to ensure the purity of the lubricating oil and the lubricating oil content in the refrigerant (affecting the heat exchange effect of the heat exchanger). The lubricating oil comes out of the oil separator and enters the oil tank, carrying a small amount of refrigerant, which reduces the viscosity of the lubricating oil and affects the lubricating effect of the lubricating oil on the compressor. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides an ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control, which solves the problem that part of the gaseous refrigerant is mixed when the oil of the prior art heat pump unit is discharged into the oil tank after oil separation.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] An ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control, comprising a compressor, the compressor outlet is connected to an oil separator, the refrigerant outlet of the oil separator is sequentially connected to a condenser, a filter, an expansion valve, an evaporator and refluxed to the compressor to form a refrigeration cycle system;

[0007] The lubricating oil outlet of the oil separator is sequentially connected to the throttle valve, oil tank, oil pump, oil filter, oil cooler and connected to the compressor and compressor motor to form a lubricating oil circulation system;

[0008] The upper end of the oil tank is provided with a return pipe for discharging gas, and the return pipe is connected to the return port of the compressor through a pipeline. The lower end of the oil tank is provided with an oil delivery pipe for discharging oil, and the oil delivery pipe is connected to the oil pump;

[0009] A mounting frame is fixedly mounted on the upper side of the oil tank, and a separation component for separating oil and gas is mounted inside the mounting frame.

[0010] Preferably, a cover plate is installed on one side of the oil tank through a flange ring, a first liquid level gauge for liquid level detection is installed in the oil tank, and a second liquid level gauge for liquid level detection is installed in the oil separator.

[0011] Preferably, the separation assembly includes a first shell, a connecting cover and a second shell, the first shell, the connecting cover and the second shell are connected by a flange ring, a feed through hole is arranged inside the first shell, an oil drop pipe is arranged at the bottom of the second shell, and an exhaust through hole is opened in the center of the second shell.

[0012] Preferably, a boss is provided on the inner wall of the second shell, a bearing ring is provided on the inner wall of the boss, and sealing rings are provided on both sides of the bearing ring.

[0013] Preferably, an extension sleeve is provided inside the bearing ring, a plurality of support rods are provided on one side of the extension sleeve, a rotating disk is fixedly mounted on one end of the support rod, and a rotating shaft is fixedly mounted at the center of the rotating disk.

[0014] Preferably, a support frame is rotatably provided on one side of the inner wall of the connecting cover, a spiral blade is installed between the support frame and the rotating shaft, a tightening groove is provided on the other side of the inner wall of the connecting cover, and a spiral guide plate is provided on the inner wall of the tightening groove.

[0015] Preferably, a filter element is placed inside the support rod, a positioning groove is formed at one end of the filter element, a positioning seat is provided on the surface of the rotating disk, and the positioning seat is connected to the positioning groove.

[0016] Preferably, a sealing strip is provided between every two of the support rods and the filter element, a thread groove is provided on the inner wall of the extension sleeve, a pressure ring is provided at one end of the filter element, a locking thread is provided on the outer surface of the pressure ring, and the locking thread is threadably matched with the thread groove.

[0017] Preferably, a fixing frame is installed on the upper side of the second shell, a motor is fixedly installed on the upper end of the fixing frame, a driving gear is fixedly installed on the output end of the motor, a transmission gear ring is installed on the outer side of the extension sleeve, and the driving gear is meshed with the transmission gear ring.

[0018] Preferably, an electric heating net for heating is fixedly installed on one side of the interior of the first shell, and a wiring channel is opened inside the first shell, and the electric heating net and the motor cable both pass through the wiring channel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. When the material enters, it will first enter the feed through hole. After being separated, the gas will come out from the exhaust through hole and then be discharged under the action of the return air pipe, while the liquid oil will fall from the oil drop pipe to the inside of the oil tank, so as to realize the separate discharge of gas and oil, avoiding the contact between oil and gas again during the discharge process, so that the quality after separation can be guaranteed through the above structure.

[0021] 2. The rotating shaft drives the spiral blades to rotate, so that the incoming materials will be guided by them to be centrifugally thrown out, so that the oil will be thrown to the outside and the gas will be concentrated in the middle. Then, the tightening groove and the spiral guide plate are used to further ensure the subsequent direction and ensure the separation between oil and gas, so that the gas will enter the exhaust through hole from the middle, and the oil will fall into the oil drop pipe along the wall, realizing stable centrifugal separation.

[0022] 3. By rotating the pressure ring, the locking thread and the thread groove are threaded together, so that the pressure ring can be removed, and then the filter element can be pulled out as needed, which is convenient for personnel to clean or replace the filter element to ensure the subsequent oil separation effect. In this application, the oil and gas in the middle can be filtered by providing a filter element to prevent smaller oil droplets from being discharged from the exhaust through hole, further improving the separation effect and achieving multiple oil separations.

[0023] 4. The driving gear is driven to rotate by starting the motor, and the driving gear meshes with the transmission gear ring under the rotation. The extension sleeve is arranged inside the bearing ring, so that the extension sleeve and the rotating shaft rotate, and the positioning seat is connected with the positioning groove, so that the filter element will also rotate, and the oil filtered outside the filter element can be thrown out, thereby discharging the oil on the surface of the filter element, avoiding the accumulation of oil on the surface of the filter element, which will reduce the filtering effect of the filter element.

[0024] 5. In this application, when the lubricating oil containing a small amount of refrigerant comes out of the oil separator, it is depressurized through the throttle valve and enters the oil-gas separation component. After separation, the refrigerant gas comes out from the exhaust hole and then flows back to the return side of the compressor through the return pipe, while the liquid oil will fall from the oil drop pipe to the inside of the oil tank, realizing the secondary separation of oil and refrigerant, thereby increasing the purity of the lubricating oil and ensuring the lubrication effect on the compressor bearings. Secondly, the throttle valve opening is controlled by detecting the liquid level of the oil separator and the liquid level gauge in the oil tank to ensure that there is an appropriate amount of lubricating oil in the oil tank to participate in the oil circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a heat pump unit;

[0026] Figure 2 It is a three-dimensional structural schematic diagram of the oil tank;

[0027] Figure 3 It is a schematic diagram of the structure of the oil tank from a top view;

[0028] Figure 4 yes Figure 3 Schematic diagram of the cross-section structure at AA in the middle;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the separated components;

[0030] Figure 6 It is a three-dimensional structural diagram of the separated components from another perspective;

[0031] Figure 7 It is a schematic diagram of the top view structure of the separation component;

[0032] Figure 8 yes Figure 7 Schematic diagram of the cross-section structure at BB;

[0033] Fig. 9 yes Figure 8 A is an enlarged schematic diagram of the structure;

[0034] Fig.10 yes Figure 7 Schematic diagram of the cross-section structure at CC;

[0035] Fig.11 yes Figure 7 Schematic diagram of the cross-section structure at DD in the middle;

[0036] Fig.12 yes Figure 7 Schematic diagram of the cross-section structure at EE;

[0037] Fig.13 It is an exploded view of the internal structure of the separated components;

[0038] Fig.14 This is another perspective of the internal structure explosion diagram of the separated components.

[0039] In the figure: a, evaporator; b, expansion valve; c, filter; d, condenser; e, oil separator; f, throttle valve; g, oil tank; h, oil pump; i, oil filter; j, oil cooler; k, compressor; m, second liquid level gauge; 1, cover plate; 2, return air pipe; 3, oil pipeline; 4, first liquid level gauge; 5, separation assembly; 501, first shell; 5011, feed through hole; 5012, electric heating network; 5013, wiring channel; 502, connection cover; 5021, support frame; 5022, spiral blade; 5023, tightening groove; 5024, spiral guide plate ; 503, second housing; 5031, oil drop pipe; 5032, exhaust through hole; 5033, boss; 5034, bearing ring; 5035, sealing ring; 504, fixing frame; 5041, motor; 5042, driving gear; 505, rotating shaft; 5051, rotating disk; 5052, support rod; 5053, extension sleeve; 5054, transmission gear ring; 5055, threaded groove; 5056, positioning seat; 506, filter element; 5061, positioning groove; 507, sealing strip; 508, pressure ring; 5081, locking thread; 6, mounting frame; 7, flange ring. DETAILED DESCRIPTION

[0040] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] like Figures 1 to 14 As shown, an ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control includes a compressor k, the outlet of the compressor k is connected to the oil separator e, the refrigerant outlet of the oil separator e is sequentially connected to the condenser d, the filter c, the expansion valve b, the evaporator a and refluxed to the compressor k to form a refrigeration cycle system;

[0042] The lubricating oil outlet of the oil separator e is connected in sequence to the throttle valve f, the oil tank g, the oil pump h, the oil filter i, the oil cooler j and the compressor k and the compressor k motor to form a lubricating oil circulation system;

[0043] The upper end of the oil tank g is provided with a return air pipe 2 for discharging gas, and the return air pipe 2 is connected to the return air port of the compressor k through a pipeline. The lower end of the oil tank g is provided with an oil delivery pipe 3 for discharging oil, and the oil delivery pipe 3 is connected to the oil pump h;

[0044] A mounting frame 6 is fixedly mounted on the upper side of the oil tank g, and a separation component 5 for separating oil and gas is mounted inside the mounting frame 6.

[0045] In this embodiment, a cover plate 1 is installed on one side of the oil tank g through a flange ring 7, a first liquid level gauge 4 for liquid level detection is installed in the oil tank g, and a second liquid level gauge m for liquid level detection is installed in the oil separator e.

[0046] In this embodiment, the separation component 5 includes a first shell 501, a connecting cover 502 and a second shell 503. The first shell 501, the connecting cover 502 and the second shell 503 are all connected by a flange ring 7. A feed through hole 5011 is arranged inside the first shell 501, an oil drop pipe 5031 is arranged at the bottom of the second shell 503, and an exhaust through hole 5032 is opened in the center of the second shell 503.

[0047] When the material enters, it will first enter the feed hole 5011. After being separated, the gas will come out from the exhaust hole 5032 and then be discharged under the action of the return air pipe 2, while the liquid oil will fall from the oil drop pipe 5031 to the oil tank g, thereby achieving separate discharge of gas and oil, avoiding the oil and gas from contacting each other again during the discharge process, and thus the quality after separation can be guaranteed through the above structure.

[0048] The inner wall of the second housing 503 is provided with a boss 5033, the inner wall of the boss 5033 is provided with a bearing ring 5034, and sealing rings 5035 are respectively provided on both sides of the bearing ring 5034;

[0049] An extension sleeve 5053 is disposed inside the bearing ring 5034 , a plurality of support rods 5052 are disposed on one side of the extension sleeve 5053 , a rotating disk 5051 is fixedly mounted on one end of the support rods 5052 , and a rotating shaft 505 is fixedly mounted at the center of the rotating disk 5051 .

[0050] It should be noted that a support frame 5021 is rotatably provided on one side of the inner wall of the connecting cover 502, and a spiral blade 5022 is installed between the support frame 5021 and the rotating shaft 505. A tightening groove 5023 is provided on the other side of the inner wall of the connecting cover 502, and a spiral guide plate 5024 is provided on the inner wall of the tightening groove 5023.

[0051] In order to ensure that the material entering the feed through hole 5011 can be centrifugally separated, the rotating shaft 505 is rotated to drive the spiral blade 5022 to rotate, so that the entered material will be guided by it to be centrifugally thrown out, so that the oil will be thrown to the outside and the gas will be concentrated in the middle. Then, the tightening groove 5023 and the spiral guide plate 5024 are used to further ensure the subsequent direction to ensure the separation between oil and gas, so that the gas will enter the exhaust through hole 5032 from the middle, and the oil will fall along the wall into the oil drop pipe 5031, realizing stable centrifugal separation.

[0052] In the specific configuration, a filter element 506 is placed inside the support rod 5052 , a positioning groove 5061 is opened at one end of the filter element 506 , a positioning seat 5056 is arranged on the surface of the rotating disk 5051 , and the positioning seat 5056 is connected to the positioning groove 5061 .

[0053] Among them, a sealing strip 507 is arranged between every two support rods 5052 and the filter element 506, a thread groove 5055 is arranged on the inner wall of the extension sleeve 5053, a pressure ring 508 is arranged at one end of the filter element 506, and a locking thread 5081 is arranged on the outer surface of the pressure ring 508, and the locking thread 5081 is threadedly matched with the thread groove 5055.

[0054] In order to facilitate maintenance, the pressure ring 508 is rotated to make the locking thread 5081 and the thread groove 5055 fit together, so that the pressure ring 508 can be removed, and then the filter element 506 can be pulled out as needed, which is convenient for personnel to clean or replace the filter element 506 to ensure the subsequent oil separation effect. In the present application, the filter element 506 is provided to filter the oil and gas in the middle to prevent smaller oil droplets from being discharged from the exhaust hole 5032, thereby further improving the separation effect and achieving multiple oil separations.

[0055] In the present application, a fixing frame 504 is installed on the upper side of the second shell 503, a motor 5041 is fixedly installed on the upper end of the fixing frame 504, a driving gear 5042 is fixedly installed on the output end of the motor 5041, a transmission gear ring 5054 is installed on the outer side of the extension sleeve 5053, and the driving gear 5042 is meshed with the transmission gear ring 5054.

[0056] The driving gear 5042 is driven to rotate by starting the motor 5041, and the driving gear 5042 is engaged with the transmission gear ring 5054 under the rotation. The extension sleeve 5053 is arranged inside the bearing ring 5034, so that the extension sleeve 5053 and the rotating shaft 505 rotate, and the positioning seat 5056 is connected with the positioning groove 5061, so that the filter element 506 will also rotate, and the oil filtered outside the filter element 506 can be thrown out, thereby discharging the oil on the surface of the filter element 506, avoiding the accumulation of oil on the surface of the filter element 506, resulting in a decrease in the filtering effect of the filter element 506.

[0057] An electric heating net 5012 for heating is fixedly installed on one side of the first shell 501 , and a wiring channel 5013 is opened inside the first shell 501 , through which the cables of the electric heating net 5012 and the motor 5041 pass.

[0058] Before the oil enters, the current material can be heated by starting the electric heating network 5012 to further react the refrigerant to ensure that the refrigerant is in a gaseous state, thereby ensuring the subsequent separation effect.

[0059] The working principle of this ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control:

[0060] When the mixed oil enters the feed through hole 5011, the electric heating net 5012 is first started to heat the current material, further causing the refrigerant to react, so as to ensure that the refrigerant is in a gaseous state and ensure the subsequent separation effect;

[0061] After that, the oil will enter the connection cover 502. When entering, the starting motor 5041 drives the rotating shaft 505 to rotate and drives the spiral blade 5022 to rotate, so that the entered material will be centrifugally thrown out under its guidance, so that the oil will be thrown to the outside and the gas will be concentrated in the middle. Then, the tightening groove 5023 and the spiral guide plate 5024 are used to further ensure the subsequent direction and ensure the separation between oil and gas.

[0062] After the initial oil separation is completed, the gas will enter the exhaust through hole 5032 from the middle, and the oil will fall along the wall into the oil drop pipe 5031. Some oil will remain in the gas in the middle. The oil can be filtered out by the filter element 506 and accumulated on the surface of the filter element 506 to ensure that there is no oil inside the gas. Finally, the gas will be discharged from the exhaust through hole 5032 and returned to the gas under the action of the return pipe 2.

[0063] During the filtering process, the driving gear 5042 is driven to rotate by starting the motor 5041, and the driving gear 5042 is meshed with the transmission gear ring 5054 under the rotation, wherein the extension sleeve 5053 is arranged inside the bearing ring 5034, so that the extension sleeve 5053 and the rotating shaft 505 rotate, and the positioning seat 5056 is connected with the positioning groove 5061, so that the filter element 506 also rotates, and the oil filtered outside the filter element 506 can be thrown out, thereby discharging the oil on the surface of the filter element 506;

[0064] The above steps are used to achieve centrifugal separation of oil and gas and allow the oil to fall into the oil tank g. Then, the oil pump h is started as needed to discharge the oil from the oil pipeline 3.

[0065] In this application, the control logic has a built-in algorithm that can calculate the amount of oil in the oil separator and the oil level height, and subtract the calculated amount of oil in the oil separator and the oil tank from the known system filling oil to obtain the refrigeration system oil circulation volume. This calculated oil circulation volume participates in the compressor exhaust superheat control. When the oil circulation volume exceeds the warning value (which means that the system oil circulation volume is too large, it is necessary to close the expansion valve b of the refrigeration main circuit, increase the compressor k return air superheat to increase the compressor exhaust superheat, thereby reducing the compressor exhaust carryover).

[0066] In the present application, a second liquid level meter m for liquid level detection is installed in the oil separator e, and the unit controller controls the opening of the throttle valve f based on the liquid levels detected by the first liquid level meter 4 and the second liquid level meter m.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. An ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control, characterized in that: The invention comprises a compressor (k), wherein the outlet of the compressor (k) is connected to an oil separator (e), and the refrigerant outlet of the oil separator (e) is connected to a condenser (d), a filter (c), an expansion valve (b), and an evaporator (a) in sequence and is reflux-connected to the compressor (k) to form a refrigeration cycle system; The lubricating oil outlet of the oil separator (e) is sequentially connected to the throttle valve (f), the oil tank (g), the oil pump (h), the oil filter (i), the oil cooler (j), and the compressor (k) and the motor of the compressor (k) to form a lubricating oil circulation system; The upper end of the oil tank (g) is provided with a return pipe (2) for discharging gas, and the return pipe (2) is connected to the return port of the compressor (k) through a pipeline. The lower end of the oil tank (g) is provided with an oil delivery pipe (3) for discharging oil, and the oil delivery pipe (3) is connected to the oil pump (h); A mounting frame (6) is fixedly mounted on the upper side of the oil tank (g), and a separation component (5) for separating oil and gas is mounted inside the mounting frame (6); The separation assembly (5) comprises a first shell (501), a connecting cover (502) and a second shell (503); the first shell (501), the connecting cover (502) and the second shell (503) are connected via a flange ring (7); a feed through hole (5011) is arranged inside the first shell (501); an oil drop pipe (5031) is arranged at the bottom of the second shell (503); an exhaust through hole (5032) is opened at the center of the second shell (503); a boss (5033) is arranged on the inner wall of the second shell (503); a bearing ring (5034) is arranged on the inner wall of the boss (5033); and sealing rings (5035) are arranged on both sides of the bearing ring (5034); An extension sleeve (5053) is arranged inside the bearing ring (5034), a plurality of support rods (5052) are arranged on one side of the extension sleeve (5053), a rotating disk (5051) is fixedly mounted on one end of the support rod (5052), a rotating shaft (5055) is fixedly mounted at the center of the rotating disk (5051), a support frame (5021) is rotatably arranged on one side of the inner wall of the connecting cover (502), a spiral blade (5022) is installed between the support frame (5021) and the rotating shaft (505), a tightening groove (5023) is arranged on the other side of the inner wall of the connecting cover (502), and a spiral guide plate (5024) is arranged on the inner wall of the tightening groove (5023); A filter element (506) is placed inside the support rod (5052), a positioning groove (5061) is provided at one end of the filter element (506), a positioning seat (5056) is provided on the surface of the rotating disk (5051), and the positioning seat (5056) is butted against the positioning groove (5061).

2. The ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control according to claim 1, characterized in that: A cover plate (1) is installed on one side of the oil tank (g) via a flange ring (7), a first liquid level gauge (4) for liquid level detection is installed in the oil tank (g), and a second liquid level gauge (m) for liquid level detection is installed in the oil separator (e).

3. The ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control according to claim 1, characterized in that: A sealing strip (507) is provided between every two of the support rods (5052) and the filter element (506); a thread groove (5055) is provided on the inner wall of the extension sleeve (5053); a pressure ring (508) is provided at one end of the filter element (506); a locking thread (5081) is provided on the outer surface of the pressure ring (508); and the locking thread (5081) is threadably matched with the thread groove (5055).

4. The ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control according to claim 1, characterized in that: A fixing frame (504) is installed on the upper side of the second housing (503), a motor (5041) is fixedly installed on the upper end of the fixing frame (504), a driving gear (5042) is fixedly installed on the output end of the motor (5041), a transmission gear ring (5054) is installed on the outer side of the extension sleeve (5053), and the driving gear (5042) is meshed with the transmission gear ring (5054).

5. The ultra-high temperature heat pump unit with secondary oil separation function and oil circulation volume control according to claim 4, characterized in that: An electric heating net (5012) for heating is fixedly installed on one side of the interior of the first shell (501), and a wiring channel (5013) is provided inside the first shell (501), and cables of the electric heating net (5012) and the motor (5041) both pass through the wiring channel (5013).

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