Efficient economizer of centrifugal water chilling unit

Abstract

The efficient economizer comprises a plate heat exchanger and a filtering bin, an air outlet pipe is arranged at the top of one side of the plate heat exchanger, and a first liquid inlet pipe is arranged under the top of the side, close to the air outlet pipe, of the plate heat exchanger. A connecting pipe communicated with the first liquid inlet pipe is arranged on one side of the top of the filtering bin, a throttling pipe is arranged on the side, away from the first liquid inlet pipe, of the bottom of the filtering bin, an electromagnetic valve is arranged at the bottom of the throttling pipe, and a second liquid inlet pipe communicated with the interior of the plate heat exchanger is arranged at the bottom of the electromagnetic valve; a thermostatic expansion valve matched with the interior of the second liquid inlet pipe is arranged on the outer side of the second liquid inlet pipe. And through mutual cooperation of the filter bin, the filter screen plate and the sponge filter plate, refrigeration liquid can be filtered, impurities contained in the refrigeration liquid are effectively prevented from entering the throttling pipe, the blockage phenomenon in the throttling pipe is reduced, and pipeline protection work is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange devices, in particular to a high-efficiency economizer for a centrifugal chiller. Background Technique

[0002] An economizer is a heat exchanger that absorbs heat through the throttling evaporation of the refrigerant itself, so that another part of the refrigerant can be subcooled. The economizer is often used in centrifugal chillers. The efficiency of ordinary single-stage screw compressors is reduced, the refrigerating capacity is reduced, and the exhaust temperature is relatively high. By adopting the economizer air injection cycle, the efficiency of the single-stage screw compression refrigeration cycle can be improved, the refrigerating capacity can be increased, and the compressor exhaust temperature can be reduced.

[0003] Due to the small inner diameter of the intercepting pipeline inside the existing high-efficiency economizer, it is easy to be blocked by water condensate ice or other impurities, which affects the heat exchange efficiency. Moreover, when using a single filter screen plate for filtering work, later it is also necessary for operators to manually clean and replace the filter screen plate regularly, which increases the tediousness and inconvenience of the later work of the operators. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-efficiency economizer for a centrifugal chiller, which is convenient to realize the filtering work of the throttling pipe inside the high-efficiency economizer and improve the later filtering efficiency of the filter screen plate, reduce the blockage phenomenon, and eliminate the need for manual cleaning by operators.

[0005] To achieve the above purpose, a high-efficiency economizer for a centrifugal chiller is provided, which includes a plate heat exchanger and a filter chamber. An air outlet pipe is arranged at the top of one side of the plate heat exchanger. A first liquid inlet pipe is arranged directly below the top of the plate heat exchanger close to the air outlet pipe. A connecting pipe communicating with the first liquid inlet pipe is arranged at one side of the top of the filter chamber. A throttling pipe is arranged at one side of the bottom of the filter chamber far from the first liquid inlet pipe. An electromagnetic valve is arranged at the bottom of the throttling pipe. A second liquid inlet pipe communicating with the inside of the plate heat exchanger is arranged at the bottom of the electromagnetic valve. A thermostatic expansion valve matched with the inside of the second liquid inlet pipe is arranged on the outer side of the second liquid inlet pipe. A liquid outlet pipe is arranged at one end of the back of the bottom of one side of the plate heat exchanger. A sponge filter plate and an impact rod are respectively arranged on both sides inside the filter chamber. A driving cleaning component is arranged at the top of the filter chamber, which is convenient to realize the anti-blocking function of the throttling pipe inside the high-efficiency economizer and improve the later filtering efficiency.

[0006] According to the high-efficiency economizer for a centrifugal chiller, the driving cleaning component includes a cleaning plate, a U-shaped connecting rod, a first spring, a cam, a rotating rod, a motor and a fixing plate. The fixing plate is located at one side of the top of the filter chamber far from the connecting pipe. A motor is arranged at the top of the fixing plate close to the connecting pipe. A rotating rod is arranged at the output end of the motor;

[0007] On one side of the rotating rod close to the connecting pipe, there is a cam. Right below the cam, there is a U-shaped connecting rod extending into the interior of the filter chamber, and the U-shaped connecting rod cooperates with the cam. At the inner top of the U-shaped connecting rod, there is a first spring connected to the filter chamber. At the bottom of the U-shaped connecting rod, there is a cleaning plate in contact with the filter mesh plate. An impact assembly is provided outside the rotating rod, facilitating the primary dredging work outside the filter mesh plate.

[0008] According to the efficient economizer of the centrifugal chiller described above, the impact assembly includes a push block, a pressing block, a second spring, an impact rod, and a vibration block. There are two sets of the vibration block and the push block. The two sets of vibration blocks are located at the top and the middle positions on the side of the filter mesh plate close to the sponge filter plate. The two sets of push blocks are located at the top and the bottom outside the rotating rod. Right below the push block, there is a pressing block cooperating with it. At the bottom of the pressing block, there is an impact rod extending into the interior of the filter chamber and in contact with the vibration block. At the top outside the impact rod, there is a second spring sleeved and connected to the pressing block, facilitating the secondary dredging work inside the filter mesh plate.

[0009] According to the efficient economizer of the centrifugal chiller described above, at the middle position and the bottom on the side of the impact rod close to the vibration block, there are impact blocks, and the impact blocks cooperate with the vibration block, facilitating the impact work between the impact rod and the vibration block.

[0010] According to the efficient economizer of the centrifugal chiller described above, at the top of one end of the back of one set of push blocks and at the bottom of one end of the back of the other set of push blocks, and at the top of one end of the front of the pressing block, there are guiding inclined surfaces, and the two sets of guiding inclined surfaces cooperate with each other, facilitating the pressing block to move downward by the guiding inclined surfaces when the push block rotates later.

[0011] According to the efficient economizer of the centrifugal chiller described above, at the front end of the filter chamber, there is a sealed chamber door hinged, and at the front end of the sealed chamber door, there is a handle, facilitating the opening and replacement work of the filter chamber.

[0012] The beneficial effects of the above solution: Through the mutual cooperation of the filter chamber, the filter mesh plate, and the sponge filter plate, the filtering work of the refrigeration liquid can be realized, effectively preventing impurities contained in the refrigeration liquid from entering the interior of the throttle pipe, reducing the blockage phenomenon occurring inside the throttle pipe, and realizing the protection work of the pipeline;

[0013] At the same time, through the mutual cooperation of the cleaning plate, the U-shaped connecting rod, the first spring, the cam, the rotating rod, and the motor, the automatic cleaning work outside the filter mesh plate can be conveniently realized, reducing the blockage phenomenon caused by impurity accumulation, improving the later filtering efficiency, and eliminating the need for operators to manually replace and repair the filter mesh plate.

[0014] Finally, through the mutual cooperation of the rotating rod, motor, pushing block, pressing block, spring two, impact rod and vibrating block, during the process of automatically cleaning the outer side of the filter screen plate, the vibrating operation of the inside of the filter screen plate can also be realized, so as to further improve the filtering efficiency of the filter screen plate, effectively prevent the blockage phenomenon occurring inside it, realize the flexibility and convenience of cleaning and dredging the inside of the filter screen plate, and extend the later service life of the filter screen plate.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below in conjunction with the drawings and embodiments;

[0017] Figure 1 is a three-dimensional structural schematic diagram of a high-efficiency economizer of a centrifugal chiller according to the present utility model;

[0018] Figure 2 is a front view sectional view of a high-efficiency economizer of a centrifugal chiller according to the present utility model;

[0019] Figure 3 is a front view sectional view of a filter chamber of a high-efficiency economizer of a centrifugal chiller according to the present utility model;

[0020] Figure 4 is a side view of a pushing block of a high-efficiency economizer of a centrifugal chiller according to the present utility model.

[0021] Legend Explanation:

[0022] 1. Plate heat exchanger; 2. First liquid inlet pipe; 3. Gas outlet pipe; 4. Connecting pipe; 5. Filter chamber; 6. Solenoid valve; 7. Liquid outlet pipe; 8. Thermostatic expansion valve; 9. Second liquid inlet pipe; 10. Sponge filter plate; 11. Impact rod; 12. Filter screen plate; 13. Cleaning plate; 14. Vibrating block; 15. U-shaped connecting rod; 16. First spring; 17. Cam; 18. Rotating rod; 19. Pushing block; 20. Motor; 21. Fixed plate; 22. Pressing block; 23. Second spring; 24. Throttle pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0024] Refer to Figures 1-4, in an embodiment of the present utility model, an efficient economizer for a centrifugal chiller includes a plate heat exchanger 1 and a filter chamber 5. At the top of one side of the plate heat exchanger 1, there is an air outlet pipe 3. Just below the top of the side of the plate heat exchanger 1 close to the air outlet pipe 3, there is a first liquid inlet pipe 2. On one side of the top of the filter chamber 5, there is a connecting pipe 4 that communicates with the first liquid inlet pipe 2. On the side of the bottom of the filter chamber 5 away from the first liquid inlet pipe 2, there is a throttle pipe 24. At the bottom of the throttle pipe 24, there is a solenoid valve 6. At the bottom of the solenoid valve 6, there is a second liquid inlet pipe 9 that communicates with the inside of the plate heat exchanger 1. On the outside of the second liquid inlet pipe 9, there is a thermostatic expansion valve 8 that cooperates with its inside. At the back end of the bottom of one side of the plate heat exchanger 1, there is a liquid outlet pipe 7. On both sides inside the filter chamber 5, there are respectively a sponge filter plate 10 and an impact rod 11. At the top of the filter chamber 5, there is a driving cleaning assembly.

[0025] The driving cleaning assembly includes a cleaning plate 13, a U-shaped connecting rod 15, a first spring 16, a cam 17, a rotating rod 18, a motor 20 and a fixing plate 21. The fixing plate 21 is located on the side of the top of the filter chamber 5 away from the connecting pipe 4. At the top of the side of the fixing plate 21 close to the connecting pipe 4, there is a motor 20. The output end of the motor 20 is provided with a rotating rod 18;

[0026] On the side of the rotating rod 18 close to the connecting pipe 4, there is a cam 17. Just below the cam 17, there is a U-shaped connecting rod 15 that extends into the filter chamber 5, and the U-shaped connecting rod 15 cooperates with the cam 17. At the inner top of the U-shaped connecting rod 15, there is a first spring 16 connected to the filter chamber 5. At the bottom of the U-shaped connecting rod 15, there is a cleaning plate 13 that fits against the filter screen plate 12. On the outside of the rotating rod 18, there is an impact assembly.

[0027] The impact assembly includes a push block 19, a pressing block 22, a second spring 23, an impact rod 11 and a vibration block 14. There are two sets of vibration blocks 14 and push blocks 19. The two sets of vibration blocks 14 are located at the top and the middle position on the side of the filter screen plate 12 close to the sponge filter plate 10. The two sets of push blocks 19 are located at the top and the bottom on the outside of the rotating rod 18. Just below the push block 19, there is a pressing block 22 that cooperates with it. At the bottom of the pressing block 22, there is an impact rod 11 that extends into the filter chamber 5 and fits against the vibration block 14. On the outside of the top of the impact rod 11, there is a second spring 23 connected to the pressing block 22.

[0028] At the middle position and the bottom on the side of the impact rod 11 close to the vibration block 14, there are impact blocks, and the impact blocks cooperate with the vibration block 14.

[0029] At the top of the back end of one set of push blocks 19 and the bottom of the back end of the other set of push blocks 19, and at the top of the front end of the pressing block 22, there are guiding inclined surfaces, and the two sets of guiding inclined surfaces cooperate with each other.

[0030] One end of the front side of the filter chamber 5 is hinged with a sealed chamber door, and a handle is provided at one end of the front side of the sealed chamber door.

[0031] Working principle: During use, the plate heat exchanger 1 and the components above it can be directly installed at the designated position inside the centrifugal chiller. Then, the refrigeration liquid enters the inside of the first inlet pipe 2. Then, the refrigeration liquid is divided into two paths inside the first inlet pipe 2. One path passes through the heat medium and enters the inside of the plate heat exchanger 1, and the other passes through the connecting pipe 4 and enters the inside of the filter chamber 5. The filter screen plate 12 and the sponge filter plate 10 designed inside the filter chamber 5 are used to filter the impurities contained in the refrigeration liquid, reduce the blockage phenomenon caused by the accumulation of impurities inside the throttle pipe 24, improve the later conversion efficiency, and protect the throttle pipe 24. Then, the filtered refrigeration liquid can enter the inside of the plate heat exchanger 1 through the throttle pipe 24, the solenoid valve 6, the thermostatic expansion valve 8, and the second inlet pipe 9. The solenoid valve 6 is used to control the flow of the liquid inside the throttle pipe 24. Then, the thermostatic expansion valve 8 is used to adjust the pressure and temperature of the liquid. Finally, the liquid enters the inside of the plate heat exchanger 1 through the cold medium inlet inside the second inlet pipe 9. Then, heat exchange is realized inside the plate heat exchanger 1. Finally, the first path of liquid enters the refrigeration terminal through the outlet pipe 7, and the second path of liquid becomes superheated and turns into gas and enters the compressor through the outlet pipe 3;

[0032] When it is necessary to clean the outside of the filter screen plate 12 later, the motor 20 can be used to rotate the rotating rod 18 and the cam 17 simultaneously, so that the bottom end of the cam 17 can push the U-shaped connecting rod 15 to move downward inside the filter chamber 5 to compress the first spring 16 during the rotation of the cam 17. Then, the cleaning plate 13 is driven by the U-shaped connecting rod 15 to perform brush cleaning outside the filter screen plate 12, reducing the accumulation and blockage of impurities on its outside. Finally, when the bottom end of the cam 17 is separated from the resistance against the U-shaped connecting rod 15 during the continuous rotation of the cam 17, the elastic restoring force of the first spring 16 can be used to move the cleaning plate 13 upward to restore its original position, thereby realizing the reciprocating movement of the cleaning plate 13 up and down;

[0033] During the rotation of the rotating rod 18, the pushing block 19 can also be driven to rotate. When the guiding inclined surface at one end of the pushing block 19 rotates and aligns with the guiding inclined surface at the front end of the pressing block 22, the pushing block 19 can push the pressing block 22 through the guiding inclined surface, driving the impact rod 11 to move downward inside the filter chamber 5, compressing the second spring 23. At this time, the movement of the impact rod 11 can move away from the contact with the vibration block 14. When the pushing block 19 continues to rotate and disengages from the resistance of the pressing block 22, the elastic restoring force of the second spring 23 can drive the impact rod 11 to recover and impact the vibration block 14, thereby realizing the reciprocating impact vibration work between the impact rod 11 and the vibration block 14. Through the vibration generated by the impact, the secondary dredging work of the inside of the filter screen plate 12 is realized, effectively improving the internal filtration efficiency of the filter screen plate 12, eliminating the need for operators to manually disassemble, clean and replace, and extending the service life in the later stage.

[0034] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A high efficiency economizer for a centrifugal chiller, comprising: A plate heat exchanger (1) and a filter chamber (5), characterized in that an air outlet pipe (3) is provided at the top of one side of the plate heat exchanger (1), a liquid inlet pipe (2) is provided just below the top of the plate heat exchanger (1) on the side close to the air outlet pipe (3), a connecting pipe (4) which is interconnected with the liquid inlet pipe (2) is provided at one side of the top of the filter chamber (5), a throttling pipe (24) is provided at the bottom of the filter chamber (5) on the side away from the liquid inlet pipe (2), and the bottom of the throttling pipe (24) is provided with a A solenoid valve (6) is provided, and a second liquid inlet pipe (9) which is interconnected with the interior of the plate heat exchanger (1) is provided at the bottom of the solenoid valve (6), and a thermal expansion valve (8) which cooperates with the interior of the second liquid inlet pipe (9) is provided on the outer side of the second liquid inlet pipe (9), and a liquid outlet pipe (7) is provided at one end of the back side of the bottom of one side of the plate heat exchanger (1), and a sponge filter plate (10) and an impact rod (11) are provided on both sides of the interior of the filter chamber (5), and a driving cleaning component is provided on the top of the filter chamber (5).

2. The high-efficiency economizer of a centrifugal chiller according to claim 1, characterized in that: The driving cleaning assembly comprises a cleaning plate (13), a U-shaped connecting rod (15), a spring (16), a cam (17), a rotating rod (18), a motor (20) and a fixing plate (21); the fixing plate (21) is located at a side of the top of the filter bin (5) away from the connecting pipe (4); the top of the fixing plate (21) close to the connecting pipe (4) is provided with a motor (20); and the output end of the motor (20) is provided with a rotating rod (18); A cam (17) is provided on one side of the rotating rod (18) close to the connecting pipe (4); a U-shaped connecting rod (15) extending into the interior of the filter bin (5) is provided directly below the cam (17); the U-shaped connecting rod (15) and the cam (17) cooperate with each other; a spring (16) connected to the filter bin (5) is provided at the inner top of the U-shaped connecting rod (15); a cleaning plate (13) in contact with the filter screen plate (12) is provided at the bottom of the U-shaped connecting rod (15); and an impact assembly is provided on the outside of the rotating rod (18).

3. The high-efficiency economizer of a centrifugal chiller according to claim 2, characterized in that: The impact assembly comprises a push block (19), a pressing block (22), a second spring (23), an impact rod (11) and a vibration block (14). The vibration block (14) and the push block (19) are both provided in two groups. The two groups of the vibration blocks (14) are located at the top and middle positions of the filter screen plate (12) close to the sponge filter plate (10). The two groups of the push blocks (19) are located at the top and bottom of the outer side of the rotating rod (18). A pressing block (22) cooperating with the push block (19) is provided directly below the push block (19). The bottom of the pressing block (22) is provided with an impact rod (11) extending into the interior of the filter bin (5) and fitting with the vibration block (14). The top of the outer side of the impact rod (11) is sleeved with a second spring (23) connected to the pressing block (22).

4. The high-efficiency economizer of a centrifugal chiller according to claim 3, characterized in that: The impact rod (11) is provided with an impact block at the middle position of one side close to the vibration block (14) and at the bottom, and the impact block cooperates with the vibration block (14).

5. The high-efficiency economizer of a centrifugal chiller according to claim 3, characterized in that: The top of one end of the back side of one group of push blocks (19), the bottom of one end of the back side of another group of push blocks (19), and the top of one end of the front side of the pressing block (22) are all provided with guiding inclined surfaces, and the two groups of guiding inclined surfaces cooperate with each other.

6. The high-efficiency economizer of a centrifugal chiller according to claim 1, characterized in that: A sealed compartment door is hingedly provided at one end of the front side of the filter compartment (5), and a handle is provided at one end of the front side of the sealed compartment door.

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