Condensation evaporator of low-temperature refrigerator

Abstract

The utility model discloses a condensation evaporator of a low-temperature refrigerator, and belongs to the field of air separation equipment. The heat exchange mechanism comprises a nitrogen feeding pipe and heat exchange pipes, the nitrogen feeding pipe is fixedly installed on the vertical shell, the heat exchange pipes are fixedly installed in the evaporation chambers, are of a spiral disc structure and communicate with the nitrogen feeding pipe, and the diameters of the sections of the heat exchange pipes are gradually increased from the ends, close to the spraying heads, of the evaporation chambers to the ends, away from the spraying heads, of the evaporation chambers; a discharge pipe penetrating through the vertical shell is fixedly installed at the end, away from the spraying head, of the heat exchange pipe. According to the condensation evaporator, the diameter of the bottom of the heat exchange tube is gradually increased compared with the diameter of the top, the outer wall of the heat exchange tube on the upper portion cannot effectively shield the outer wall of the heat exchange tube on the lower portion, and therefore all the positions of the surface of the heat exchange tube can rapidly receive a certain amount of liquid oxygen, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of air separation equipment technology, specifically a condenser-evaporator for a cryogenic chiller. Background Technology

[0002] A cryogenic chiller is a type of air separation equipment, typically referring to cryogenic refrigeration equipment used in air separation units. Air separation equipment is generally used to cool and separate different gaseous components (such as nitrogen, oxygen, argon, etc.) in air to achieve the high-purity gases required for industrial production. The cryogenic chiller is responsible for cooling the air to extremely low temperatures, liquefying it, thus facilitating the separation of the various components. Cryogenic chillers generally employ compression, expansion, and cooling technologies, using multiple stages of heat exchange and expansion to cool the gas to its liquefaction temperature, thereby extracting the desired liquid gas.

[0003] Chinese utility model patent CN222103978U2 discloses a condenser-evaporator. It increases the heat exchange time and area between liquid oxygen and nitrogen through a spiral tube and spiral blades on the tube wall, thereby improving heat exchange efficiency. However, since the spiral tube and spiral blades are of the same diameter, the liquid oxygen sprayed from the top spray pipe is blocked by the upper spiral tube and spiral blades, and usually cannot effectively spray the lower spiral tube and the outer wall of the spiral blades. That is, the lower spiral tube and spiral blades only receive a portion of the sprayed liquid oxygen. Only through prolonged spraying or the liquid oxygen flowing downwards through the spiral blades can the same spraying effect as the upper spiral tube and spiral blades be achieved. This leads to uneven heat exchange and a certain loss of heat exchange efficiency.

[0004] Therefore, this application provides a condenser-evaporator for a low-temperature chiller to solve the above-mentioned problems. Utility Model Content

[0005] This application provides a condenser-evaporator for a low-temperature chiller, aiming to solve the problems mentioned in the background art, where the spiral tube and spiral blades at the bottom of the existing condenser-evaporator can only receive a portion of the sprayed liquid oxygen. Only through long-term spraying or the liquid oxygen above flowing down through the spiral blades can the same spraying effect as the top of the spiral tube and spiral blades be achieved. This leads to uneven heat exchange and a certain loss of heat exchange efficiency.

[0006] To achieve the above objectives, this application provides the following technical solution: a condenser-evaporator for a low-temperature chiller, comprising a vertical shell and a plurality of annularly distributed baffles fixedly installed within the vertical shell, wherein the baffles divide the vertical shell into a plurality of independently arranged evaporation chambers, and each evaporation chamber is equipped with a heat exchange mechanism.

[0007] The heat exchange mechanism includes a nitrogen feed pipe fixedly installed on a vertical shell and heat exchange tubes fixedly installed in a spiral disc structure in several evaporation chambers and connected to the nitrogen feed pipe. Several liquid oxygen feed pipes extending into the evaporation chambers are fixedly installed on the vertical shell. A spray head is fixedly installed at one end of the liquid oxygen feed pipe in the evaporation chamber. The cross-sectional diameter of the heat exchange tubes gradually increases from the end near the spray head to the end away from the spray head in the evaporation chamber. A discharge pipe penetrating the vertical shell is fixedly installed at the end of the heat exchange tube away from the spray head. In this way, during use, nitrogen is introduced into the heat exchange tube through the nitrogen feed pipe, and liquid oxygen is supplied to the spray head through the liquid oxygen feed pipe. The liquid oxygen is sprayed into the evaporation chamber and falls freely onto the surface of the spiral heat exchange tube, where it exchanges heat with the nitrogen inside the heat exchange tube. Since the diameter of the bottom of the heat exchange tube gradually increases compared to the top, the outer wall of the upper heat exchange tube cannot effectively shield the outer wall of the lower heat exchange tube, so that all parts of the heat exchange tube surface can quickly receive a certain amount of liquid oxygen, thereby improving the heat exchange efficiency.

[0008] Preferably, for rapid gas intake, several branch pipes adapted to the heat exchange tubes are fixedly installed on the outer wall of the nitrogen feed pipe. The branch pipes penetrate the vertical shell and extend into the vertical shell, where they are fixedly connected to the ends of the heat exchange tubes. This provides convenient and centralized feeding, facilitating operation.

[0009] Preferably, to facilitate the distribution of liquid oxygen, a ring pipe is fixedly installed at one end of each of the liquid oxygen feed pipes located outside the vertical housing, and an injection pipe is fixedly installed on the ring pipe. This makes feeding more convenient.

[0010] Preferably, to reduce waste, the condenser-evaporator further includes a spraying mechanism. This mechanism comprises several motors fixedly mounted on the outer wall of the vertical casing near the discharge pipe end, corresponding to the evaporation chamber. Each motor has a rotating rod fixedly mounted, extending into the evaporation chamber and located at the center of the heat exchange tubes. Several evenly distributed, curved-surface striking plates are fixedly mounted on the outer wall of the rotating rod. This further utilizes the wasted liquid oxygen, improving heat exchange efficiency.

[0011] Preferably, to stabilize the rotating rod, a fixing rod extending from the end of the rotating rod is fixedly installed on the partition plate, and a collar sleeved on the end of the rotating rod is fixedly installed on the fixing rod. This prevents the rotating rod from shaking during rotation and ensures stable operation.

[0012] This condenser-evaporator feeds nitrogen into the heat exchange tubes through a nitrogen feed pipe and supplies liquid oxygen to the spray heads through a liquid oxygen feed pipe. The liquid oxygen is sprayed into the evaporation chamber and falls freely onto the surface of the spiral heat exchange tubes, where it exchanges heat with the nitrogen inside the tubes. Because the diameter of the heat exchange tubes gradually increases from the bottom to the top, the outer wall of the upper heat exchange tubes cannot effectively shield the outer wall of the lower heat exchange tubes. This allows all parts of the heat exchange tube surface to quickly receive a certain amount of liquid oxygen, thereby improving the heat exchange efficiency.

[0013] This condenser-evaporator starts with a motor, which drives a rotating rod to rotate. The rotating rod then drives a striking plate to fling the falling liquid oxygen, which is then flung back onto the heat exchange tube from one side of the inner wall of the heat exchange tube, further utilizing the wasted liquid oxygen and improving heat exchange efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the external structure of a condenser-evaporator in a low-temperature chiller;

[0015] Figure 2 This is a schematic diagram of the bottom structure of a condenser-evaporator in a low-temperature chiller;

[0016] Figure 3 This is a schematic cross-sectional view of the condenser-evaporator of a low-temperature chiller.

[0017] In the picture:

[0018] 1. Vertical shell; 2. Baffle plate; 3. Evaporation chamber; 4. Heat exchange mechanism; 41. Nitrogen feed pipe; 42. Diverter pipe; 43. Heat exchange tube; 44. Discharge pipe; 45. Ring pipe; 46. Liquid oxygen feed pipe; 47. Spray head; 48. Injection pipe; 5. Spraying mechanism; 51. Motor; 52. Rotating rod; 53. Impacting plate; 54. Fixing rod; 55. Collar. Detailed Implementation

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

[0020] Example 1

[0021] This embodiment provides a condenser-evaporator for a low-temperature chiller, such as... Figure 1-3 As shown, the condenser-evaporator includes a vertical shell 1 and several annularly distributed baffles 2 fixedly installed inside the vertical shell 1. The baffles 2 divide the vertical shell 1 into several independently arranged evaporation chambers 3, and a heat exchange mechanism 4 is provided in the evaporation chamber 3.

[0022] The heat exchange mechanism 4 includes a nitrogen feed pipe 41 fixedly installed on the vertical shell 1 and a heat exchange tube 43 fixedly installed in a spiral disc structure in several evaporation chambers 3 and connected to the nitrogen feed pipe 41. Several liquid oxygen feed pipes 46 extending into the evaporation chambers 3 are fixedly installed on the vertical shell 1. A spray head 47 is fixedly installed on one end of the liquid oxygen feed pipe 46 in the evaporation chamber 3. The cross-sectional diameter of the heat exchange tube 43 gradually increases from the end near the spray head 47 to the end away from the spray head 47 in the evaporation chamber 3. A discharge pipe 44 that penetrates the vertical shell 1 is fixedly installed on the end of the heat exchange tube 43 away from the spray head 47.

[0023] In use, nitrogen is fed into the heat exchange tube 43 through the nitrogen feed pipe 41, and liquid oxygen is fed to the spray head 47 through the liquid oxygen feed pipe 46. The liquid oxygen is sprayed into the evaporation chamber 3 and falls freely onto the surface of the spiral heat exchange tube 43 to exchange heat with the nitrogen inside the heat exchange tube 43. Since the diameter of the bottom of the heat exchange tube 43 gradually increases compared to the top, the outer wall of the upper heat exchange tube 43 cannot effectively block the outer wall of the lower heat exchange tube 43, so that all parts of the surface of the heat exchange tube 43 can quickly receive a certain amount of liquid oxygen, thereby improving the heat exchange efficiency.

[0024] Specifically, several distribution pipes 42 adapted to the heat exchange tubes 43 are fixedly installed on the outer wall of the nitrogen feed pipe 41. The distribution pipes 42 penetrate the vertical shell 1 and extend into the vertical shell 1, and are fixedly connected to the ends of the heat exchange tubes 43. In use, nitrogen is distributed through the nitrogen feed pipe 41 into several distribution pipes 42, and then enters several heat exchange tubes 43, making the feeding convenient and centralized, and easy to operate.

[0025] More specifically, several liquid oxygen feed pipes 46 have a ring pipe 45 fixedly installed at one end outside the vertical housing 1, and an injection pipe 48 is fixedly installed on the ring pipe 45. In use, the liquid oxygen supply equipment is connected through the injection pipe 48, and the liquid oxygen enters into the ring pipe 45 and is distributed into the liquid oxygen feed pipes 46, making feeding more convenient.

[0026] Example 2

[0027] Unlike Embodiment 1, when liquid oxygen is sprayed from the spray head 47, the center of the heat exchange tube 43 is empty and cannot receive liquid oxygen. Therefore, this condenser-evaporator also includes a spraying mechanism 5. The spraying mechanism 5 includes several motors 51 fixedly installed on the outer wall of the vertical shell 1 near one end of the discharge pipe 44, corresponding to the evaporation chamber 3. A rotating rod 52 extending into the evaporation chamber 3 and located at the center of the heat exchange tube 43 is fixedly installed on the motor 51. Several evenly distributed, curved-surface striking plates 53 are fixedly installed on the outer wall of the rotating rod 52. In use, the motor 51 is started, and the motor 51 drives the rotating rod 52 to rotate. The rotating rod 52 drives the striking plates 53 to swing the falling liquid oxygen, which is then thrown from one side of the inner wall of the heat exchange tube 43 back onto the heat exchange tube 43, further utilizing the wasted liquid oxygen and improving the heat exchange efficiency.

[0028] Specifically, a fixing rod 54 extending from the end of the rotating rod 52 is fixedly installed on the partition 2, and a collar 55 is fixedly installed on the fixing rod 54 and sleeved on the end of the rotating rod 52. In use, the fixing rod 54 is fixed to the side wall of the partition 2, and the collar 55 is sleeved on the end of the rotating rod 52, so that the rotating rod 52 will not wobble when rotating, ensuring stable operation.

[0029] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A condenser-evaporator for a low-temperature chiller, comprising a vertical shell (1) and a plurality of annularly distributed baffles (2) fixedly installed within the vertical shell (1), wherein the plurality of baffles (2) divide the vertical shell (1) into a plurality of independently arranged evaporation chambers (3), wherein a heat exchange mechanism (4) is provided within the evaporation chambers (3), characterized in that: The heat exchange mechanism (4) includes a nitrogen feed pipe (41) fixedly installed on the vertical shell (1) and a heat exchange tube (43) fixedly installed in a spiral disc structure in several evaporation chambers (3) and connected to the nitrogen feed pipe (41). Several liquid oxygen feed pipes (46) extending into the evaporation chambers (3) are fixedly installed on the vertical shell (1). A spray head (47) is fixedly installed on one end of the liquid oxygen feed pipe (46) in the evaporation chamber (3). The cross-sectional diameter of the heat exchange tube (43) gradually increases from the end near the spray head (47) to the end away from the spray head (47) in the evaporation chamber (3). A discharge pipe (44) that penetrates the vertical shell (1) is fixedly installed on the end of the heat exchange tube (43) away from the spray head (47).

2. A low-temperature cold machine condensing evaporator according to claim 1, characterized in that: Several diversion pipes (42) adapted to the heat exchange tube (43) are fixedly installed on the outer wall of the nitrogen feed pipe (41). The diversion pipes (42) penetrate the vertical shell (1) and extend into the vertical shell (1) and are fixedly connected to the end of the heat exchange tube (43).

3. A low temperature cold machine condensing evaporator according to claim 1, characterized in that: A ring pipe (45) is fixedly installed on one end of each of the liquid oxygen feed pipes (46) located outside the vertical housing (1), and an injection pipe (48) is fixedly installed on the ring pipe (45).

4. A low temperature cold machine condensing evaporator according to claim 1, characterized in that: The condenser-evaporator also includes a spraying mechanism (5), which includes several motors (51) fixedly installed on the outer wall of the vertical shell (1) near the end of the discharge pipe (44) and corresponding to the evaporation chamber (3). A rotating rod (52) extending into the evaporation chamber (3) and located at the center of the heat exchange tube (43) is fixedly installed on the motor (51). Several evenly arranged tapping plates (53) with curved surfaces are fixedly installed on the outer wall of the rotating rod (52).

5. A low temperature cold machine condensing evaporator according to claim 4, characterized in that: A fixing rod (54) extending to the end of the rotating rod (52) is fixedly installed on the partition (2), and a collar (55) sleeved on the end of the rotating rod (52) is fixedly installed on the fixing rod (54).

Images