A heat pump system

Abstract

The utility model provides a kind of heat pump system, it is related to refrigeration equipment technical field, heat pump system includes circulation loop and multiple compressor, circulation loop includes the multiple branch pipes of being mutually parallelly connected;Multiple compressor is respectively arranged on multiple branch pipe, and each compressor is connected with reservoir;Among them, the oil equalizing pipe is connected between adjacent two reservoirs.The heat pump system of the utility model has multiple compressor, each compressor is equipped with reservoir, and the oil equalizing pipe is connected between adjacent two reservoirs.The oil equalizing pipe uses communicating vessel principle, to make the liquid level of two reservoirs inside lubricating oil keep isohypse, so that the oil equalizing pipe can be two degrees distribution to the lubricating oil that enters multiple compressor, to make under the premise of guaranteeing total amount of lubricating oil, meet before compression lubricating oil enters oil equalizing, and compressor wear probability is small, and service life is long.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to a heat pump system. Background Technology

[0002] As demand increases in heat pump systems, compressor displacement also rises. However, the displacement of a single compressor is limited, necessitating the parallel operation of multiple compressors. A crucial aspect of parallel compressor systems is oil leveling control, ensuring each compressor receives sufficient lubricating oil to lubricate its moving parts, achieving sealing, cooling, and lubrication. A common oil leveling method involves connecting an oil balance pipe to the compressor's oil sump, where the oil first returns to each compressor, creating high and low oil levels before equalization. However, this method can sometimes lead to insufficient lubrication replenishment, causing compressor wear and limiting its lifespan.

[0003] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] To address the issues of compressor wear and limited lifespan, the purpose of this invention is to provide a heat pump system with a compressor that has a long service life.

[0005] To achieve the above objectives, the present invention employs the following technical means: This utility model provides a heat pump system, including: A circulating loop includes multiple branch pipes connected in parallel. Multiple compressors are respectively installed on multiple branch pipes, and each compressor is connected to a liquid receiver; An oil equalization pipe connects two adjacent liquid reservoirs.

[0006] Optionally, in the direction of oil flow in the circulation loop, the reservoir is located upstream of the compressor.

[0007] Optionally, the liquid reservoir is provided with an inlet pipe and an outlet pipe, and a filter screen is provided between the inlet pipe and the outlet pipe.

[0008] Optionally, an oil return hole is provided on the outlet pipe, and the outlet pipe is connected to the cavity of the liquid reservoir through the oil return hole.

[0009] Optionally, the oil equalization pipe is located on the bottom wall of the liquid reservoir, and the height of the pipe opening is not higher than the height of the oil return hole.

[0010] Optionally, the diameter of the oil distribution pipe is R1, and the diameter of the oil return hole is R2, where R1:R2 = (2~5):1.

[0011] Optionally, the circulation loop further includes an exhaust pipe, which is connected in series with multiple branch pipes, and also includes a gas-liquid separator, which is disposed on the exhaust pipe.

[0012] Optionally, the output end of the gas-liquid separator is provided with an oil return channel, and the output end of the oil return channel is connected to the inlet pipes of the plurality of liquid storage tanks respectively.

[0013] Optionally, it also includes a four-way valve, an evaporator, a condenser, and a throttle valve. The circulation loop also includes an intake pipe and an exhaust pipe, with the four-way valve located between the intake pipe and the exhaust pipe.

[0014] Optionally, the circulation loop includes a first branch pipe and a second branch pipe, and there are two compressors, which are respectively located in the first branch pipe and the second branch pipe.

[0015] Compared with the prior art, this utility model brings the following technical effects: This utility model's heat pump system has multiple compressors, each equipped with a liquid receiver. Adjacent liquid receivers are connected by an oil equalization pipe. Utilizing the principle of communicating vessels, the oil equalization pipe maintains the lubricating oil levels in the two liquid receivers at the same height. This allows the oil equalization pipe to perform a secondary distribution of the lubricating oil entering the multiple compressors. While ensuring a sufficient total amount of lubricating oil, it also ensures that the lubricating oil is evenly distributed before entering the compressor, resulting in lower compressor wear and a longer service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The diagram shows a schematic representation of the structure of a heat pump system according to some embodiments of the present invention; Figure 2 A schematic diagram of the structure of a liquid reservoir according to some embodiments of the present invention is shown.

[0018] Explanation of key component symbols: 10-Circulation loop; 11-Intake pipe; 12-First branch pipe; 13-Second branch pipe; 14-Exhaust pipe; 15-Return oil passage; 20-Compressor; 21-Liquid receiver; 211-Inlet pipe; 212-Filter screen; 213-Receiving cavity; 214-Outlet pipe; 215-Oil return hole; 216-Oil equalization pipe; 30 - Gas-liquid separator; 40 - Four-way valve; 50 - Evaporator; 60 - Condenser; 70 - Throttling valve. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0021] Please see Figures 1-2 This utility model provides a heat pump system, including: The circulating loop 10 includes multiple branch pipes connected in parallel with each other; Multiple compressors 20 are respectively installed on multiple branch pipes, and each compressor 20 is connected to a liquid receiver 21; Among them, an oil equalization pipe 216 is connected between two adjacent liquid reservoirs 21.

[0022] The heat pump system of this invention includes multiple compressors 20, each compressor 20 having a liquid receiver 21. An oil equalization pipe 216 connects two adjacent liquid receivers 21. Utilizing the principle of communicating vessels, the oil equalization pipe 216 maintains the lubricating oil levels in the two liquid receivers 21 at the same height. This allows the oil equalization pipe 216 to perform a secondary distribution of the lubricating oil entering the multiple compressors 20, ensuring that the total amount of lubricating oil is guaranteed while achieving oil equalization before entering the compressors. This results in a lower probability of compressor wear and a longer service life.

[0023] In one specific embodiment, the circulation loop 10 includes a first branch pipe 12 and a second branch pipe 13, and there are two compressors 20, which are respectively located on the first branch pipe 12 and the second branch pipe 13.

[0024] Correspondingly, each of the two compressors 20 has two liquid reservoirs 21, one of which is located on the first branch pipe 12, and the other is located on the second branch pipe 13. An oil equalization pipe 216 connects the two liquid reservoirs 21. The oil equalization pipe 216 is used to distribute the lubricating oil in the two liquid reservoirs 21 until the liquid levels in the two liquid reservoirs 21 are approximately equal.

[0025] The following description uses two compressors 20 as examples, but the scope of protection is not limited thereto. The heat pump system of this invention can also be applied to three, four, five, or six compressors 20.

[0026] In one specific embodiment, in the direction of oil flow within the circulation loop 10, the reservoir 21 is located upstream of the compressor 20.

[0027] The liquid receiver 21 and the compressor 20 are both located on the same branch pipe. Specifically, one compressor 20 and its connected liquid receiver 21 are located on the first branch pipe 12, and the other compressor 20 and its connected liquid receiver 21 are located on the second branch pipe 13.

[0028] Furthermore, the compressor 20 has an intake port and an exhaust port. The intake port is connected to the first branch pipe 12, and the exhaust port is connected to the first branch pipe 12. The lubricating oil flows through the liquid receiver 21, then enters the compressor 20 through the intake port, and is then discharged through the exhaust port.

[0029] In this way, the lubricating oil can be effectively redistributed before entering the compressor 20, ensuring a more timely supply of lubricating oil and further improving the service life of the compressor 20.

[0030] In one specific embodiment, the liquid reservoir 21 is provided with an inlet pipe 211 and an outlet pipe 214, and a filter screen 212 is provided between the inlet pipe 211 and the outlet pipe 214.

[0031] The inlet pipe 211 and the outlet pipe 214 are located above and below the liquid reservoir 21, respectively, and both the inlet pipe 211 and the outlet pipe 214 extend outward through the liquid reservoir 21. A certain gap is maintained between the inlet pipe 211 and the outlet pipe 214 to accommodate the filter screen 212.

[0032] The filter screen 212 is located between the inlet pipe 211 and the outlet pipe 214 to effectively separate the lubricating oil, refrigerant liquid, and refrigerant gas mixture that may be introduced into the liquid receiver 21, thereby improving the stability of the compressor 20.

[0033] Furthermore, the filter screen 212 is fixedly installed on the inner peripheral wall of the liquid reservoir 21.

[0034] Optionally, the filter screen 212 is fixedly connected to the inner peripheral wall of the reservoir 21, thereby ensuring stable and reliable installation of the filter screen 212 and low maintenance costs. For example, the filter screen 212 can be welded to the inner peripheral wall of the reservoir 21.

[0035] Optionally, the filter screen 212 is detachably connected to the inner peripheral wall of the reservoir 21, so that the filter screen 212 can be removed from the reservoir 21 for replacement. For example, the filter screen 212 is fixed to the reservoir 21 by means of snap-fit, screw locking, magnetic connection or interference fit.

[0036] During the operation of the heat pump system, the refrigerant and lubricating oil mixture enters the receiver 21 cavity from the inlet pipe of the compressor 20 receiver 21. Due to the sudden increase in diameter by more than 5 times, the flow rate decreases sharply. The lubricating oil, any refrigerant liquid or gas mixture that may be introduced, separate in the cavity. After passing through the filter screen 212 at the top of the receiver 21, further adhesion and separation occur, and the liquid accumulates at the bottom of the receiver 21.

[0037] The filter screen 212 is arranged in an upward concave arc shape, so that the filter screen 212 has a larger contact area with the lubricating oil entering the liquid reservoir 21 through the inlet pipe 211, thereby improving the separation capacity of the filter screen 212.

[0038] In one specific embodiment, an oil return hole 215 is provided on the outlet pipe 214, and the outlet pipe 214 is connected to the cavity of the liquid reservoir 21 through the oil return hole 215.

[0039] Normally, lubricating oil enters the oil reservoir through the inlet pipe 211 and leaves the oil reservoir through the outlet pipe 214. When there is sufficient lubricating oil in the outlet pipe 214, the lubricating oil will be forced out through the return oil hole 215 and then enter the cavity of the reservoir 21. When the liquid level in the cavity 213 of the reservoir 21 is higher than the liquid level in other reservoirs 21, the lubricating oil leaves the reservoir 21 through the return oil channel 15 until the liquid levels in the two reservoirs 21 are equal.

[0040] By setting an oil return hole 215 on the outlet pipe 214, lubricating oil can not only enter the receiving cavity 213 through the filter screen 212, but also enter the receiving cavity 213 through the oil return hole 215, thereby improving the liquid level adjustment efficiency of the reservoir 21.

[0041] In one specific embodiment, the oil equalization pipe 216 is located on the bottom wall of the reservoir 21, and the height of the pipe opening of the oil equalization pipe 216 is not higher than the height of the return oil hole 215. In this way, under the action of gravity, the lubricating oil leaves through the return oil hole 215 and can enter the oil equalization pipe 216 in a timely manner, without accumulating in the receiving cavity 213 of the reservoir 21 or flowing back into the outlet pipe 214 from the receiving cavity 213, thereby further improving the oil equalization efficiency of the reservoir 21.

[0042] The height of the oil equalization pipe 216 is the distance from the pipe opening of the oil equalization pipe 216 to the bottom wall of the reservoir 21, and the height of the oil return hole 215 is the distance from the oil return hole 215 to the bottom wall of the reservoir 21.

[0043] In one specific embodiment, the diameter of the oil distribution pipe 216 is R1, and the diameter of the return oil hole 215 is R2, where R1:R2 = (2~5):1.

[0044] For example, the diameter R2 of the return oil hole 215 is 1 mm, and the diameter R1 of the oil distribution pipe 216 is 2 mm, 2.5 mm, 3 mm, 3.7 mm, 4 mm, or 4.9 mm.

[0045] The diameter of the oil equalization pipe 216 is configured to be slightly larger than the diameter of the return oil hole 215. In this way, the pressure of the lubricating oil in the oil equalization pipe 216 is less than that in the return oil hole 215. Under the action of pressure difference, the lubricating oil will reach the oil equalization pipe 216 from the return oil hole 215, further improving the oil equalization efficiency of the reservoir 21.

[0046] In one specific embodiment, the circulation loop 10 further includes an exhaust pipe 14, which is connected in series with multiple branch pipes, and also includes a gas-liquid separator 30, which is disposed on the exhaust pipe 14.

[0047] The entire circulation loop 10 includes an intake pipe 11, an exhaust pipe 14, a first branch pipe 12, and a second branch pipe 13. The first branch pipe 12 and the second branch pipe 13 are connected in parallel. The intake pipe 11 is the input end of the lubricating oil, and it is connected in series with the first branch pipe 12 and the second branch pipe 13. The exhaust pipe 14 is the output end of the lubricating oil, and it is connected in series with the first branch pipe 12 and the second branch pipe 13.

[0048] A gas-liquid separator 30 is located on the exhaust pipe 14, which is also the output end of the compressor 20. The gas-liquid separator 30 further filters and separates the refrigerant liquid and refrigerant gas mixture in the exhaust pipe 14 to extend the service life of the compressor 20.

[0049] In one specific embodiment, the output end of the gas-liquid separator 30 is provided with an oil return channel 15, and the output end of the oil return channel 15 is connected to the inlet pipe 211 of a plurality of liquid reservoirs 21.

[0050] By setting up the oil return channel 15, the lubricating oil can enter the reservoir 21 in a timely manner through the oil return channel 15. That is, the lubricating oil can be pre-mixed before entering the compressor 20, which further improves the oil mixing efficiency of the reservoir 21.

[0051] Specifically, the input end of the oil return channel 15 is connected to the gas-liquid separator 30, and the output end of the oil return channel 15 is connected to the suction pipe 11.

[0052] In one specific embodiment, the heat pump system further includes a four-way valve 40, an evaporator 50, a condenser 60, and a throttle valve 70. The circulation loop 10 also includes an exhaust pipe 14. The four-way valve 40 is located between the intake pipe and the exhaust pipe 14. The four-way valve 40 is located on the four-way valve 40.

[0053] The heat pump system can be controlled to cool or heat by selecting different connection modes through the four-way valve 40. In the heat pump system, the four-way valve 40, evaporator 50, condenser 60, and expansion valve 70 are all standard settings and will not be described in detail here.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom still fall within the protection scope of this invention.

Claims

1. A heat pump system, characterized in that, include: A circulating loop includes multiple branch pipes connected in parallel. Multiple compressors are respectively installed on multiple branch pipes, and each compressor is connected to a liquid receiver; An oil equalization pipe connects two adjacent liquid reservoirs.

2. The heat pump system according to claim 1, characterized in that, In the direction of oil flow within the circulation loop, the reservoir is located upstream of the compressor.

3. The heat pump system according to claim 1, characterized in that, The liquid reservoir is provided with an inlet pipe and an outlet pipe, and a filter screen is provided between the inlet pipe and the outlet pipe.

4. The heat pump system according to claim 3, characterized in that, An oil return hole is provided on the outlet pipe, and the outlet pipe is connected to the cavity of the liquid reservoir through the oil return hole.

5. The heat pump system according to claim 4, characterized in that, The oil equalization pipe is located on the bottom wall of the liquid reservoir, and the height of the pipe opening is not higher than the height of the oil return hole.

6. The heat pump system according to claim 4, characterized in that, The diameter of the oil distribution pipe is R1, and the diameter of the return oil hole is R2, where R1:R2 = (2~5):

1.

7. The heat pump system according to claim 3, characterized in that, The circulation loop also includes an exhaust pipe, which is connected in series with multiple branch pipes, and a gas-liquid separator, which is located on the exhaust pipe.

8. The heat pump system according to claim 7, characterized in that, The gas-liquid separator is provided with an oil return channel at its output end, and the output end of the oil return channel is connected to the inlet pipes of the multiple liquid storage tanks respectively.

9. The heat pump system according to claim 1, characterized in that, It also includes a four-way valve, an evaporator, a condenser, and a throttle valve. The circulation loop also includes an intake pipe and an exhaust pipe, with the four-way valve located between the intake pipe and the exhaust pipe.

10. The heat pump system according to claim 1, characterized in that, The circulation loop includes a first branch pipe and a second branch pipe, and there are two compressors, which are respectively located on the first branch pipe and the second branch pipe.

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