Condenser with liquid level self-control throttling function and using method

Abstract

The invention discloses a condenser with a liquid level self-control throttling function and a using method, the condenser comprises a condenser cylinder, and an air inlet and a liquid outlet are formed in the condenser cylinder; a condensation heat exchange pipe used for cooling and liquefying inlet air and a supercooling heat exchange pipe located on the lower portion of the condenser cylinder and used for conducting secondary heat exchange on a liquid refrigerant to form a supercooled refrigerant are arranged in the condenser cylinder. A liquid level self-control throttling mechanism is arranged at the liquid outlet and used for keeping the liquid level of the liquid refrigerant covering the supercooling heat exchange tube and throttling the outlet liquid; the liquid level self-control throttling mechanism is arranged, so that the liquid level of a liquid refrigerant can cover the supercooling heat exchange pipe, the refrigerant has a certain supercooling degree before flowing out of the condenser, the throttling function can be achieved, and stable and efficient operation of a refrigerating system is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration machinery, and in particular to a condenser with liquid level automatic control throttling and a use method thereof. Background Art

[0002] In the refrigeration system, due to different condensation methods, refrigeration units can be divided into water-cooled units, evaporative cooling units, and air-cooled units. Due to low cost and high efficiency, water-cooled condensation has always been the preferred condensation method for refrigeration units.

[0003] The compressor, condenser, throttling device, and evaporator are the four major components of the refrigeration system. The low-temperature and low-pressure gas-liquid two-phase refrigerant absorbs the heat of the relatively high-temperature chilled water in the evaporator. After the chilled water temperature is reduced, it is provided to the client for use. The liquid refrigerant absorbs heat and evaporates into a low-temperature and low-pressure gas refrigerant. After being compressed by the compressor, it becomes a high-temperature and high-pressure gas refrigerant, enters the condenser, is cooled into a liquid refrigerant, and enters the throttling device. After throttling by the throttling device, it becomes a saturated low-temperature and low-pressure gas-liquid two-phase refrigerant and enters the evaporator. The liquid refrigerant absorbs the heat of the refrigerant inside the heat exchange tube and evaporates into a gaseous refrigerant. It is sucked into the compressor together with the rest of the gaseous refrigerant to complete the entire refrigeration cycle. In the entire refrigeration cycle, the liquid refrigerant flowing out of the condenser needs to pass through certain components such as drying filters, connecting pipes, and solenoid valves. These components will produce a certain pressure drop. If the liquid refrigerant flowing out of the condenser does not have a certain degree of supercooling, part of the liquid refrigerant will vaporize into a gaseous refrigerant due to the existence of pressure drop. This is the flash evaporation phenomenon. If flash evaporation occurs before entering the throttling device, the cooling capacity of the unit will be reduced, and the energy efficiency of the entire refrigeration unit will be reduced. In severe cases, it may even cause the refrigeration unit to fail to operate normally.

[0004] Therefore, water-cooled condensers generally have heat exchange tubes arranged at the bottom of the cylinder, and the liquid refrigerant exchanges heat with the cooling water in the heat exchange tubes, so that the liquid refrigerant has a certain degree of supercooling. Therefore, the throttling device of the conventional water-cooled main engine designed and manufactured by general manufacturers generally adopts the form of an electronic expansion valve or a solenoid valve with an orifice plate to ensure that under any working conditions and any compressor load, the liquid refrigerant at the bottom of the condenser can flood the heat exchange tube at the bottom of the condenser, thereby ensuring the degree of supercooling. Electronic expansion valves and solenoid valves have high requirements for the cleanliness of liquid refrigerants, so stop valves and filters are also required on the connecting pipelines, which not only complicates the piping, but also has high costs, resulting in a waste of resources. Summary of the invention

[0005] Technical purpose: In view of the deficiencies of the above-mentioned existing condensers, the present invention discloses a condenser with liquid level automatic throttling and a method of use.

[0006] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: A condenser with liquid level automatic throttling comprises a condenser cylinder, an air inlet and a liquid outlet are arranged on the condenser cylinder, a condensation heat exchange tube for cooling and liquefying the intake air is arranged inside the condenser cylinder, and a subcooling heat exchange tube located at the lower part of the cylinder for performing secondary heat exchange on the liquid refrigerant to form a subcooled refrigerant; a liquid level automatic throttling mechanism is arranged at the liquid outlet to maintain the liquid level of the liquid refrigerant to cover the subcooling heat exchange tube and throttle the outlet liquid.

[0007] Preferably, the automatic throttling mechanism of the present invention includes a throttling tube, and a throttling hole is opened on the upper tube wall of the throttling tube. The throttling hole is higher than the height of the subcooling heat exchange tube relative to the bottom of the condenser cylinder. After the liquid level of the refrigerant is higher than the subcooling heat exchange tube and heat is exchanged with the subcooling heat exchange tube, the refrigerant enters the throttling tube from the throttling hole and is discharged from the throttling tube.

[0008] Preferably, the throttling tube of the present invention is height-adjustably arranged in a liquid storage cylinder, and the liquid storage cylinder is arranged at the liquid outlet of the condenser or is connected to the liquid outlet through a connecting pipeline, and a closed liquid storage space is formed around the throttling tube through the liquid storage cylinder.

[0009] Preferably, the present invention provides a filter screen on the outside of the throttling tube for filtering the refrigerant entering the throttling hole.

[0010] Preferably, the number of the throttling holes of the present invention is several groups, which are arranged along the height direction or the circumferential direction of the throttling tube.

[0011] Preferably, the air inlet of the present invention is arranged in the upper area of ​​the condenser cylinder, and the condenser cylinder is provided with an air inlet baffle for equalizing the flow of the intake air at a position directly opposite to the air inlet, and the air inlet baffle is welded and fixed to the condenser cylinder.

[0012] Preferably, the ends of the condensing heat exchange tube and the subcooling heat exchange tube of the present invention are fixed to the tube sheets on both sides of the condenser cylinder by expansion connection, and the pipelines are correspondingly connected to the cooling liquid used to cool the refrigerant.

[0013] The present invention discloses a method for using the condenser with liquid level automatic throttling, wherein the gaseous refrigerant enters the condenser cylinder from the air inlet, forms a saturated liquid refrigerant after passing through the condensation heat exchange tube, and is collected at the bottom of the condenser cylinder, exchanges heat with the subcooling heat exchange tube, and forms a subcooled refrigerant, which then flows out of the throttling tube through the throttling hole.

[0014] Preferably, in the present invention, during the heat exchange process between the liquid refrigerant and the subcooling heat exchange tube, the liquid refrigerant level gradually rises to the copper tube covering the subcooling heat exchange tube. When the liquid level reaches the throttling hole of the throttling tube, the subcooled refrigerant enters the throttling tube from the throttling hole.

[0015] Beneficial effects: The condenser with liquid level automatic throttling and the use method disclosed in the present invention have the following beneficial effects: 1. The liquid level automatic control throttling mechanism of the present invention can make the liquid refrigerant level cover the subcooling heat exchange tube, so that the refrigerant has a certain degree of subcooling before flowing out of the condenser to ensure the stable and efficient operation of the refrigeration system.

[0016] 2. The automatic throttling mechanism of the present invention uses a throttling tube with an upper opening, which can simultaneously control the liquid level of the refrigerant in the condenser. Compared with conventional refrigeration units, it eliminates the need for a stop valve, a filter, an electronic expansion valve (or a solenoid valve), simplifies the connecting pipelines, improves manufacturing efficiency, and reduces material and labor costs.

[0017] 3. The throttling tube of the present invention is arranged in the liquid storage cylinder and can be adjusted in height, so that it can be flexibly adjusted according to the actual specification requirements of the condenser.

[0018] 4. The condenser cylinder of the present invention is provided with an air inlet baffle at a position directly opposite to the air inlet, which can slow down the air inlet flow rate and enable the gas to fully exchange heat with the heat exchange tube, thereby improving the heat exchange efficiency and preventing the gaseous refrigerant from flowing directly out of the liquid outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0020] Figure 1 This is a structural diagram of a condenser according to Embodiment 1 of the present invention; Figure 2 This is a side view of a condenser according to Embodiment 1 of the present invention; Figure 3 This is a structural diagram of a condenser according to Embodiment 2 of the present invention; Figure 4 This is a side view of a condenser according to Embodiment 2 of the present invention; Among them, 1-condenser cylinder, 2-air inlet, 3-liquid outlet, 4-condensation heat exchange tube, 5-subcooling heat exchange tube, 6-throttling tube, 7-throttling hole, 8-liquid storage cylinder, 9-connecting pipeline, 10-filter screen, 11-air inlet baffle. DETAILED DESCRIPTION

[0021] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by way of explanation of the apparatus, composition and materials of the present disclosure, rather than limitation. On the contrary, the following description provides a convenient illustration of an exemplary embodiment for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations may be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0022] like Figure 1-Figure 4 As shown, the present invention discloses a condenser with liquid level automatic throttling, comprising a condenser cylinder 1, an air inlet 2 and a liquid outlet 3 are arranged on the condenser cylinder 1, a condensation heat exchange tube 4 for cooling and liquefying the intake air and a subcooling heat exchange tube 5 located at the lower part of the cylinder for performing secondary heat exchange on the liquid refrigerant to form a subcooled refrigerant are arranged inside the condenser cylinder 1; a liquid level automatic throttling mechanism is arranged at the liquid outlet 3 for maintaining the liquid level of the liquid refrigerant to cover the subcooling heat exchange tube 5 and throttling the outlet liquid.

[0023] The automatic throttling mechanism of the present invention only needs to ensure that it is flush with the height of the supercooling heat exchange tube or slightly higher than the copper tube height of the supercooling heat exchange tube. Under the action of the liquid level pressure difference, the liquid level of the liquid refrigerant in the condenser can reach the level of covering the supercooling heat exchange tube, thereby ensuring heat exchange and forming a supercooled refrigerant.

[0024] The present invention provides two installation methods of the liquid level automatic throttling mechanism. In Example 1, the liquid level automatic throttling mechanism is arranged at the liquid outlet to directly replace the function of the liquid outlet, and the liquid level of the liquid refrigerant in the lower area of ​​the condenser cylinder is controlled and throttled. The existing condenser can also be modified to adopt the refrigerant structure of Example 2 of the present invention and connected through the connecting pipe 9. It is only necessary to ensure the height of the liquid level automatic throttling mechanism after installation, and this method can facilitate height adjustment.

[0025] The automatic throttling mechanism of the present invention includes a throttling tube 6, and a throttling hole 7 is opened on the upper tube wall of the throttling tube 6. The throttling hole 7 is higher than the height of the subcooling heat exchange tube 5 relative to the bottom of the condenser cylinder 1. After the liquid level of the refrigerant is higher than the subcooling heat exchange tube 5 and heat is exchanged with the subcooling heat exchange tube 5, the refrigerant enters the throttling tube 6 from the throttling hole 7 and is discharged from the throttling tube 6. The shape and arrangement of the throttling holes 7 can be adjusted. For example, the number of the throttling holes 7 can be divided into several groups and arranged along the height direction or circumferential direction of the throttling tube 6 to change the throttling performance.

[0026] In the case where the throttling tube 6 is arranged outside the condenser, it is necessary to form a space on the outside of the throttling tube 6 to allow the refrigerant to accumulate and raise the liquid level. To this end, the present invention arranges the throttling tube 6 in a height-adjustable manner in a liquid storage cylinder 8, and forms a closed liquid storage space around the throttling tube 6 through the liquid storage cylinder 8. The liquid storage cylinder 8 is arranged at the liquid outlet 3 of the condenser or is connected to the liquid outlet 3 through a connecting pipe 9. The liquid refrigerant enters the liquid storage cylinder 8 and when the liquid level reaches the throttling hole 7 of the throttling tube 6, it flows out after throttling through the throttling hole 7. In order to prevent the throttling tube from being blocked by impurities carried by the refrigerant, a filter screen 10 for filtering the refrigerant entering the throttling hole 7 can also be arranged on the outside of the throttling tube 6.

[0027] The air inlet 2 of the present invention is arranged in the upper area of ​​the condenser cylinder 1, and the condenser cylinder 1 is provided with an air inlet baffle 11 for equalizing the flow of the intake air at a position directly opposite to the air inlet 2, and the air inlet baffle 11 is welded and fixed to the condenser cylinder 1; the ends of the condensation heat exchange tube 4 and the subcooling heat exchange tube 5 are expanded and fixed to the tube sheets on both sides of the condenser cylinder 1, and the pipelines are correspondingly connected to the coolant for cooling the refrigerant; after the gaseous refrigerant enters the condenser, the air inlet baffle 11 disperses it into the condenser cylinder 1, so that the refrigerant and the condensation heat exchange tube 4 can fully exchange heat and condense, avoiding the occurrence of uneven heat exchange.

[0028] The present invention also discloses a method for using the condenser with automatic liquid level throttling. The gaseous refrigerant enters the condenser cylinder from the air inlet, forms a saturated liquid refrigerant after passing through the condensation heat exchange tube, and is collected at the bottom of the condenser cylinder. The gaseous refrigerant exchanges heat with the supercooling heat exchange tube to form a supercooled refrigerant and then flows out of the throttling tube through the throttling hole. During the heat exchange between the liquid refrigerant and the supercooling heat exchange tube, the liquid level of the liquid refrigerant gradually rises to the copper tube covering the supercooling heat exchange tube. When the liquid level reaches the throttling hole of the throttling tube, the supercooled refrigerant enters the throttling tube from the throttling hole, becomes a gas-liquid two-phase saturated refrigerant after throttling and flows out of the condenser. The liquid refrigerant that flows out has a certain degree of supercooling, which can ensure the stable and efficient operation of the refrigeration system.

Claims

1. A condenser with liquid level automatic throttling, characterized in that: The invention comprises a condenser cylinder (1), an air inlet (2) and a liquid outlet (3) are arranged on the condenser cylinder (1), a condensation heat exchange tube (4) for cooling and liquefying the inlet air and a subcooling heat exchange tube (5) located at the lower part of the cylinder for performing secondary heat exchange on the liquid refrigerant to form a subcooled refrigerant are arranged inside the condenser cylinder (1); and a liquid level automatic throttling mechanism is arranged at the liquid outlet (3) for maintaining the liquid level of the liquid refrigerant to cover the subcooling heat exchange tube (5) and throttling the outlet liquid.

2. A condenser with liquid level automatic throttling according to claim 1, characterized in that: The self-controlled throttling mechanism comprises a throttling tube (6), a throttling hole (7) is provided on the upper tube wall of the throttling tube (6), the throttling hole (7) is higher than the height of the subcooling heat exchange tube (5) relative to the bottom of the condenser barrel (1), and after the liquid level of the refrigerant is higher than the subcooling heat exchange tube (5) and heat is exchanged with the subcooling heat exchange tube (5), the refrigerant enters the throttling tube (6) from the throttling hole (7) and is discharged from the throttling tube (6).

3. A condenser with liquid level automatic throttling according to claim 2, characterized in that: The throttling tube (6) is arranged in a height-adjustable manner in a liquid storage cylinder (8); the liquid storage cylinder (8) is arranged at the liquid outlet (3) of the condenser or is connected to the liquid outlet (3) via a connecting pipe (9); a closed liquid storage space is formed around the throttling tube (6) via the liquid storage cylinder (8).

4. A condenser with liquid level automatic throttling according to claim 2, characterized in that: A filter screen (10) is arranged on the outside of the throttling tube (6) for filtering the refrigerant entering the throttling hole (7).

5. A condenser with liquid level automatic throttling according to claim 2, characterized in that: The throttling holes (7) are provided in a plurality of groups and are arranged along the height direction or the circumferential direction of the throttling tube (6).

6. A condenser with liquid level automatic throttling according to claim 1, characterized in that: The air inlet (2) is arranged in the upper region of the condenser cylinder (1); the condenser cylinder (1) is provided with an air inlet baffle (11) for equalizing the flow of the intake air at a position directly opposite the air inlet (2); the air inlet baffle (11) is fixed to the condenser cylinder (1) by welding.

7. A condenser with liquid level automatic throttling according to claim 1, characterized in that: The ends of the condensing heat exchange tube (4) and the subcooling heat exchange tube (5) are fixed to the tube sheets on both sides of the condenser barrel (1) by expansion connection, and the pipelines are correspondingly connected to a cooling liquid for cooling the refrigerant.

8. A method for using a condenser with liquid level automatic throttling according to any one of claims 1 to 7, characterized in that: The gaseous refrigerant enters the condenser cylinder from the air inlet, forms saturated liquid refrigerant after passing through the condensation heat exchange tube, and gathers at the bottom of the condenser cylinder, exchanges heat with the subcooling heat exchange tube, and forms subcooled refrigerant and flows out from the throttling tube through the throttling hole.

9. The method for using a condenser with liquid level automatic throttling according to claim 8, characterized in that: During the heat exchange process between the liquid refrigerant and the subcooling heat exchange tube, the liquid refrigerant level gradually rises to the copper tube covering the subcooling heat exchange tube. When the liquid level reaches the throttling hole of the throttling tube, the subcooling refrigerant enters the throttling tube from the throttling hole.

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