One-way flow-limiting gas collecting pipe and fin type heat exchanger

Abstract

The utility model relates to a one-way flow-limiting gas collecting pipe which comprises a gas collecting main pipe, a gas collecting main pipe, a gas collecting main pipe, a gas collecting main pipe, a gas collecting main pipe and a gas collecting main pipe, the gas collecting main pipe comprises a first main pipe and a second main pipe, wherein a main path connecting hole connected with a system refrigerant pipeline is formed in the lower pipe side of the first main pipe, and a one-way flow limiting valve is arranged in the pipeline above the main path connecting hole; a plurality of branch connecting holes are formed in the pipe side of the second main pipe at intervals; and the gas collection branch pipes are respectively connected with the branch connecting holes to form a plurality of refrigerant branches. The one-way flow-limiting valve is arranged in the gas collecting pipe with the refrigerant loop, so that the problems that the reliability of a unit is influenced by liquid refrigerant accumulated at the bottoms of fins and the upper-hot and lower-cold refrigerant distribution of the fin heat exchanger is not uniform can be solved under the heating, refrigerating and defrosting modes of the fin heat exchanger at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump components, in particular to a one-way flow-limiting gas collector and a fin heat exchanger. Background Technique

[0002] The main components of the existing integrated two-stage heat pump unit include a compressor, a fin heat exchanger, a shell-and-tube heat exchanger, and a water pump, which realize the functions of refrigeration and heating. Since there are only two heat exchangers, the unit needs to adjust the usage status of each heat exchanger through a four-way valve in different working modes to switch the heat exchanger between the evaporation and condensation states.

[0003] For the fin heat exchanger, in the refrigeration state, the fin heat exchanger acts as a condenser, and the superheated gas refrigerant needs to flow downward from the top of the fin to ensure uniform liquid distribution among the upper and lower fins and prevent the situation of upper heat and lower cold. In the heating state, the fin heat exchanger acts as an evaporator, and due to pressure loss, the saturated evaporation gas causes the refrigerant to "return liquid" and be stored at the bottom of the fin. At this time, the refrigerant needs to flow out of the fin quickly from the bottom of the fin to prevent the accumulation of refrigerant at the bottom of the fin. In the defrosting mode, the flow direction of the gas collector of the fin heat exchanger should ensure that the unit does not report high pressure during the defrosting process.

[0004] The existing gas collectors applied to fin heat exchangers are mainly positive and reverse "J" type gas collectors. For the positive "J" type gas collector, in the heating mode, due to the presence of liquid return after saturated evaporation, it can ensure that too much liquid does not accumulate in the fins of the unit, which is beneficial to heating; but in the refrigeration mode, since the gaseous refrigerant flows from low to high, the upper part of the refrigerant is more easily distributed, resulting in uneven upper heat and lower cold, which is not conducive to refrigeration; in the defrosting mode, similar to refrigeration, the gaseous refrigerant tends to flow upward more, resulting in faster defrosting of the upper part of the unit and slower defrosting of the lower part, thus resulting in problems such as uneven defrosting, incomplete defrosting, and reporting of system high pressure. The reverse "J" type gas collector is opposite to the positive "J" type gas collector. In the heating mode, due to the presence of liquid return after saturated evaporation, the liquid refrigerant is easily accumulated at the bottom of the fin and cannot flow out. Due to the mutual solubility of the refrigerant and the compressor lubricating oil, the compressor lubricating oil is also stored at the bottom of the fin, which is not conducive to the reliability of the unit; in the refrigeration mode, due to the direction of the gas collector, the gaseous refrigerant flows from high to low, and during the process, the fin condensation process is more uniform, which is beneficial to refrigeration; in the defrosting mode, similar to refrigeration, due to the direction of the gas collector, the gaseous refrigerant moves from top to bottom, and the defrosting process is more uniform, thus solving the problem of high pressure during the defrosting of the unit.

[0005] It can be seen that the existing positive and reverse "J" type gas collectors have both advantages and disadvantages in the heating, refrigeration, and defrosting working modes of the unit, and cannot take into account the three working modes to eliminate their adverse effects in a certain working mode. Content of the Utility Model

[0006] Based on this, the purpose of the utility model is to provide a one-way flow-limiting air collecting pipe, which, when used in a fin heat exchanger, can control the flow direction of the refrigerant according to the properties of the refrigerant when the fin heat exchanger is in different working conditions, thereby solving the problem that positive and negative "J" type air collecting pipes cannot be taken into account at the same time.

[0007] A one-way flow-limiting gas collecting pipe, comprising:

[0008] The gas collecting main pipe comprises a first main pipe and a second main pipe, wherein two ends of the first main pipe are respectively connected with two ends of the second main pipe to form a refrigerant circuit; wherein a main connection hole connected to the system refrigerant pipeline is provided on the lower pipe side of the first main pipe, and a one-way flow limiting valve is provided in the pipeline above the main connection hole; and a plurality of branch connection holes are provided at intervals on the pipe side of the second main pipe;

[0009] A plurality of gas collecting branch pipes are respectively connected to a plurality of branch connection holes to form a plurality of refrigerant branches.

[0010] Furthermore, the one-way flow limiting valve is a one-way valve, the inlet of which is toward the lower part of the first main pipe and the outlet is away from the lower part of the first main pipe, so that the high-temperature and high-pressure refrigerant entering the gas collecting main pipe through the main line connecting hole can flow to the middle and upper part of the first main pipe through the lower part of the first main pipe.

[0011] Furthermore, the one-way flow limiting valve is an electromagnetic two-way valve, which allows the high-temperature and high-pressure refrigerant entering through the main connection hole to flow to the middle and upper part of the first main pipe through the lower part of the first main pipe according to the working state of the fin heat exchanger.

[0012] Furthermore, the gas collecting main pipe also includes a first bent pipe and a second bent pipe, the two ends of the first bent pipe are respectively connected to one end of the first main pipe and one end of the second main pipe to form a ∪-shaped pipeline; the two ends of the second bent pipe are respectively connected to the other end of the first main pipe and the other end of the second main pipe to form a ∩-shaped pipeline; the first main pipe, the first bent pipe, the second main pipe, and the second bent pipe are sequentially connected to form a refrigerant circuit.

[0013] Furthermore, a sealing mechanism is provided on the outer sides of the plurality of branch connection holes.

[0014] Furthermore, the spoiler mesh sleeve is a spiral column, and the maximum diameter of the cross section in the spiral extension direction is 2 to 3 times the diameter of the high-transmittance protection sleeve, and the minimum diameter is 1 to 2 times the diameter of the high-transmittance protection sleeve. The sealing mechanism includes:

[0015] A fixing seat, fixedly arranged on the outer side of the second main branch connection hole;

[0016] The clamp is symmetrically arranged with respect to the branch connection hole of the fixing seat and is fixed on the second main pipe;

[0017] A sealing plate, one end of which is hinged to a fixed seat, and the other end of which is fixedly provided with a fastener for cooperating with a clamping member; its area is larger than the area of the branch connection hole and can cover the branch connection hole;

[0018] A sealing ring, which is arranged on the sealing plate, so that when the fastener of the sealing plate is clamped with the clamping member, the sealing plate is in contact with the outside of the second main pipe branch connection hole and the sealing plate tightly covers the branch connection hole.

[0019] Furthermore, the gas collecting branch pipe comprises a plurality of detachable branch pipes, the end of the detachable branch pipe is provided with an external thread, and the branch connection hole is provided with an internal thread matching the external thread.

[0020] Furthermore, the gas collecting branch pipe comprises at least two fixed branch pipes, the first fixed branch pipe and the second fixed branch pipe are respectively arranged at both ends of the second main pipe and are fixedly connected to the branch connection holes at both ends of the second main pipe.

[0021] Compared with the prior art, the unidirectional flow-limiting gas collecting pipe of the present utility model has the following beneficial effects:

[0022] 1) By providing a gas collecting main pipe with a refrigerant circuit and arranging a unidirectional flow-limiting valve above the main road connection hole of the gas collecting main pipe, when the fin heat exchanger is used as an evaporator, the problem that the reverse "J" type gas collecting pipe is easy to accumulate liquid refrigerant at the bottom of the fins and affect the reliability of the unit is solved, and when the fin heat exchanger is used as a condenser, the problem that the positive "J" type gas collecting pipe causes the fin heat exchanger to have upper heat and lower cold and uneven refrigerant distribution can be solved, that is, it can simultaneously take into account the fin heat exchanger in the heating, cooling, and defrosting modes, and avoid the problems that the accumulation of liquid refrigerant at the bottom of the fins affects the reliability of the unit and the uneven refrigerant distribution with upper heat and lower cold in the fin heat exchanger.

[0023] 2) By connecting two gas collecting main pipes through a bent pipe to form a refrigerant circuit, the pressure loss and flow resistance of the refrigerant in the gas collecting pipe can be reduced.

[0024] 3) By arranging a sealing mechanism outside a plurality of branch connection holes B and combining with detachable gas collecting branch pipes, the number of gas collecting branch pipes can be increased or decreased according to the situation of the applicable fin heat exchanger, enhancing the versatility of the gas collecting pipe.

[0025] At the same time, the present utility model also provides a fin heat exchanger, which comprises a unidirectional flow-limiting gas collecting pipe, and the unidirectional flow-limiting gas collecting pipe is the unidirectional flow-limiting gas collecting pipe described in any one of the above.

[0026] Compared with the prior art, the fin heat exchanger of the present utility model has the same beneficial effects as the above unidirectional flow-limiting gas collecting pipe, which will not be elaborated here.

[0027] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the present utility model;

[0029] Figure 2 is a schematic diagram of the refrigerant flowing out of the present utility model;

[0030] Figure 3 is a schematic diagram of the refrigerant flowing into the present utility model;

[0031] Figure 4 is a schematic diagram of a detachable gas collecting branch pipe of an embodiment of the present utility model;

[0032] Figure 5 is a schematic diagram of a fin heat exchanger of an embodiment of the present utility model. Detailed implementation manners

[0033] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of the present utility model.

[0034] To solve the technical problem that in the existing positive and reverse "J" type gas collecting pipes, there are both advantages and disadvantages in the heating, cooling, and defrosting working modes of the unit, and none of them can take into account the three working modes, that is, it is impossible to make the bottom of the fin heat exchanger not accumulate refrigerant during heating, the refrigerant condensation is uniform during cooling, and the defrosting is uniform without reporting system high pressure during defrosting.

[0035] Through research, design, testing, and project verification, the present utility model proposes a one-way flow-limiting gas collecting pipe applicable to a fin heat exchanger. The gas collecting pipe includes an annular main gas collecting pipe. A plurality of gas collecting branch pipes are arranged on one side of the annular main gas collecting pipe and communicated with the fin heat exchanger. A one-way flow-limiting valve is arranged in the upper middle part on the other side of the annular main gas collecting pipe. When the system is in the heating mode and the fin heat exchanger acts as an evaporator, the low-temperature and low-pressure gaseous refrigerant evaporated by the evaporator enters the main gas collecting pipe. Due to one-way flow limitation, there is no refrigerant flow in the upper part of the main gas collecting pipe, so that all the refrigerant flows out through the lower part of the main gas collecting pipe and enters the system refrigerant pipeline, ensuring that too much liquid does not accumulate in the fins of the unit; when the system is in the cooling mode or the defrosting mode and the fin heat exchanger acts as a condenser, the high-temperature and high-pressure refrigerant flowing out of the compressor enters the main gas collecting pipe through the lower part of the main gas collecting pipe. Due to the release of one-way flow limitation, the high-temperature and high-pressure refrigerant enters the gas collecting branch pipes from the lower part and the upper part of the annular main gas collecting pipe respectively, so that the refrigerant is evenly distributed, avoiding the uneven situation of upper heat and lower cold in the fin heat exchanger.

[0036] During specific implementation, please refer to FIG. Figures 1 - 3 , the one-way flow-limiting gas collecting pipe of the present utility model includes:

[0037] The gas collecting main pipe 10 includes a first main pipe 11 and a second main pipe 12. Both ends of the first main pipe 11 are respectively connected to both ends of the second main pipe 12 to form a refrigerant circuit. Among them, a main path connection hole A connected to the system refrigerant pipeline is provided on the lower pipe side of the first main pipe 11, and a one-way flow limiting valve 15 is provided in the pipeline above the main path connection hole A; several branch connection holes B{B1, B2,..., B i ,...B n} are provided at intervals on the pipe side of the second main pipe 12;

[0038] Several gas collecting branch pipes 20, each gas collecting branch pipe is respectively connected to several branch connection holes B to form several refrigerant sub-circuits.

[0039] The one-way flow limiting valve 15 is a one-way valve. The inlet of the one-way valve faces the lower part of the first main pipe 11, and the outlet is away from the lower part of the first main pipe 11, so that the high-temperature and high-pressure refrigerant entering the gas collecting main pipe 10 through the main path connection hole A can flow from the lower part of the first main pipe 11 to the upper middle part of the first main pipe 11.

[0040] The one-way flow limiting valve 15 can also adopt an electromagnetic two-way valve, which is opened and closed according to the working state of the fin heat exchanger, so that the high-temperature and high-pressure refrigerant entering through the main path connection hole A can flow from the lower part of the first main pipe 11 to the upper middle part of the first main pipe 11; and it can make the low-temperature and low-pressure refrigerant flowing out of the fin evaporator can only flow out from the bottom of the first main pipe 11 and then from the main path connection hole A, and cannot flow from the upper part of the first main pipe 11 to the lower part of the first main pipe 11.

[0041] In an embodiment, the gas collecting main pipe 10 further includes a first elbow 13 and a second elbow 14. Both ends of the first elbow 13 are respectively connected to one end of the first main pipe 11 and one end of the second main pipe 12 to form a ∪-shaped pipeline; both ends of the second elbow 14 are respectively connected to the other end of the first main pipe 11 and the other end of the second main pipe 12 to form a ∩-shaped pipeline; the first main pipe 11, the first elbow 13, the second main pipe 12, and the second elbow 14 are sequentially connected to form a refrigerant circuit, which is used to reduce the flow resistance of the pressure loss of the refrigerant in the gas collecting pipe.

[0042] Furthermore, the first elbow 13 and the second elbow 14 adopt bellows to reduce the oscillation and noise of the refrigerant at the bending part.

[0043] In an embodiment, please refer to Figure 4 , the several branch connection holes B{B1, B2,..., B i ,...B n} are provided with a sealing mechanism 30 on the outside, the sealing mechanism 30 includes a fixing seat 31 and a clamp 32 fixedly arranged on both sides of the branch connection hole Bi of the second main pipe 12, a sealing plate 33 hinged to the fixing seat 31, a fastener 34 fixed on the sealing plate 33 and matched with the clamp 32, and a sealing ring (not shown) arranged on the sealing plate, the area of ​​the sealing plate 33 is larger than the area of ​​the branch connection hole Bi and can cover the branch connection hole Bi, and the sealing ring contacts the outside of the branch connection hole Bi of the second main pipe 12 when the sealing mechanism 30 is clamped to seal the branch connection hole Bi and makes the sealing plate 33 tightly cover the branch connection hole Bi. The sealing mechanism 30 can also seal or open the branch connection hole Bi in a sliding sealing manner, as long as it can achieve sealing when the branch connection hole Bi needs to be sealed, and releasing the seal when the branch connection hole Bi does not need to be sealed, and does not hinder the installation of the gas collecting branch pipe, the application is not limited.

[0044] Based on the setting of the sealing mechanism 30, the gas collecting branch pipe 20 includes a plurality of detachable branch pipes 21 and at least two fixed branch pipes 22. The first fixed branch pipe 22A and the second fixed branch pipe 22B are respectively arranged at the two ends of the second main pipe 12, and are fixedly connected to the connection B at the two ends of the second main pipe 12. Furthermore, a third fixed branch pipe 22C is further included, which is arranged in the middle of the second main pipe 12 and is fixedly connected to the branch connection hole B in the middle of the second main pipe 12, so as to stabilize the entire gas collecting pipe. The end of the detachable branch pipe 21 is provided with an external thread, and the branch connection hole B is provided with an internal thread matching the external thread. The detachable branch pipe 21 can be installed and disassembled as needed, so as to increase or reduce the gas collecting branch pipes according to the actual situation, so as to adapt to fin heat exchangers of different specifications and enhance the versatility of the gas collecting pipe. The present application does not limit the fastening connection method of the detachable branch pipe 21 and the branch connection hole B, as long as the detachable branch pipe 21 can be detachable and fastened at the branch connection hole B to form a refrigerant branch.

[0045] In one embodiment, a temperature detection module (not shown) is also included. The temperature detection module is composed of a plurality of temperature sensors. A temperature sensor is installed on each gas collecting branch pipe to measure the refrigerant temperature of the gas collecting branch. The opening of the electromagnetic two-way valve is adjusted according to the refrigerant temperature of each gas collecting branch, so that the refrigerant is more evenly distributed when the system is in cooling mode or defrosting mode.

[0046] Compared with the prior art, the one-way flow-limiting gas collecting pipe of the utility model has the following beneficial effects:

[0047] 1) By providing a gas collecting main pipe with a refrigerant circuit and installing a one-way flow-limiting valve above the main path connection hole of the gas collecting main pipe, the problem that the reverse "J" type gas collecting pipe is prone to accumulating liquid refrigerant at the bottom of the fins, affecting the reliability of the unit when the fin heat exchanger is used as an evaporator, can be solved. Also, when the fin heat exchanger is used as a condenser, the problem that the positive "J" type gas collecting pipe causes the fin heat exchanger to have a hot upper part and a cold lower part and uneven refrigerant distribution can be solved. That is, it can simultaneously take into account the fin heat exchanger in heating, cooling, and defrosting modes, and avoid the problems of liquid refrigerant accumulating at the bottom of the fins affecting the reliability of the unit and uneven refrigerant distribution with a hot upper part and a cold lower part in the fin heat exchanger.

[0048] 2) Connecting the two gas collecting main pipes through a bent pipe to form a refrigerant circuit can reduce the pressure loss and flow resistance of the refrigerant in the gas collecting pipe.

[0049] 3) By providing a sealing mechanism outside a number of branch connection holes B and combining with detachable gas collecting branch pipes, the number of gas collecting branch pipes can be increased or decreased according to the situation of the applicable fin heat exchanger, enhancing the versatility of the gas collecting pipe.

[0050] 4) By installing temperature sensors on a number of gas collecting branch pipes, the one-way flow-limiting valve can be adjusted according to the temperature of each gas collecting branch pipe to make the refrigerant in the upper and lower parts of the fin heat exchanger more uniform.

[0051] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of this application. The singular forms "a", "the", and "said" used in the embodiments of this application and the claims are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that unless otherwise stated, "a plurality of" and "several" mean two or more; "and / or" means any or all possible combinations including one or more of the associated listed items; "first", "second", "third", etc. are only used for distinction and not for describing a specific order or sequence, nor can they be understood as indicating or implying relative importance. When the above description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this application, for those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] The above embodiments only represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model also intends to include these modifications and improvements.

Claims

1. A one-way flow-limiting gas collecting pipe, comprising: The gas collecting main pipe comprises a first main pipe and a second main pipe, wherein two ends of the first main pipe are respectively connected with two ends of the second main pipe to form a refrigerant circuit; wherein a main connection hole connected to the system refrigerant pipeline is provided on the lower pipe side of the first main pipe, and a one-way flow limiting valve is provided in the pipeline above the main connection hole; and a plurality of branch connection holes are provided at intervals on the pipe side of the second main pipe; A plurality of gas collecting branch pipes are respectively connected to a plurality of branch connection holes to form a plurality of refrigerant branches.

2. The one-way flow limiting gas collecting pipe according to claim 1, characterized in that: The one-way flow limiting valve is a one-way valve, the inlet of which is toward the lower part of the first main pipe and the outlet is away from the lower part of the first main pipe, so that the high-temperature and high-pressure refrigerant entering the gas collecting main pipe through the main connection hole can flow to the middle and upper part of the first main pipe through the lower part of the first main pipe.

3. The one-way flow limiting gas collecting pipe according to claim 1, characterized in that: The one-way flow limiting valve is an electromagnetic two-way valve, which allows the high-temperature and high-pressure refrigerant entering through the main connection hole to flow to the middle and upper part of the first main pipe through the lower part of the first main pipe according to the working state of the fin heat exchanger.

4. The one-way flow limiting gas collecting pipe according to any one of claims 1 to 3, characterized in that: The gas collecting main pipe also includes a first elbow and a second elbow, wherein two ends of the first elbow are respectively connected to one end of the first main pipe and one end of the second main pipe to form a ∪-shaped pipeline; two ends of the second elbow are respectively connected to the other end of the first main pipe and the other end of the second main pipe to form a ∩-shaped pipeline; the first main pipe, the first elbow, the second main pipe and the second elbow are sequentially connected to form a refrigerant circuit.

5. The one-way flow limiting gas collecting pipe according to claim 4, characterized in that: The first curved pipe and the second curved pipe are corrugated pipes.

6. The one-way flow limiting gas collecting pipe according to any one of claims 1, 2, 3 and 5, characterized in that: A sealing mechanism is provided on the outer sides of the plurality of branch connection holes.

7. The one-way flow limiting gas collecting pipe according to claim 6, characterized in that: The sealing mechanism comprises: A fixing seat, fixedly arranged on the outer side of the second main branch connection hole; The clamp is symmetrically arranged with respect to the branch connection hole of the fixing seat and is fixed on the second main pipe; A sealing plate, one end of which is hinged to the fixing seat, and the other end of which has a fastener that cooperates with the clamp; its area is larger than the area of ​​the branch connection hole and can cover the branch connection hole; The sealing ring is arranged on the sealing plate, so that when the fastener and the clamp of the sealing plate are clamped, the sealing plate contacts the outer side of the second main branch connection hole and the sealing plate tightly covers the branch connection hole.

8. The one-way flow-limiting gas collecting pipe according to claim 7, characterized in that: The gas collecting branch pipe comprises a plurality of detachable branch pipes, the ends of the detachable branch pipes are provided with external threads, and the branch connection holes are provided with internal threads matching the external threads.

9. The one-way flow limiting gas collecting pipe according to any one of claims 1, 2, 3, 5, 7 and 8, characterized in that: The gas collecting branch pipe also includes a first fixed branch pipe and a second fixed branch pipe. The first fixed branch pipe and the second fixed branch pipe are respectively arranged at two ends of the second main pipe and fixedly connected to branch connection holes at two ends of the second main pipe.

10. A fin heat exchanger, characterized in that: It comprises a one-way flow-limiting gas collecting pipe, and the one-way flow-limiting gas collecting pipe is the one-way flow-limiting gas collecting pipe as described in any one of claims 1-9.

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