Cooling capacity regulation and control device of pre-cooling system

Abstract

The utility model relates to the technical field of cooling capacity control, in particular to a cooling capacity regulation and control device of a pre-cooling system. According to the technical scheme, the temperature sensing device comprises a shell, a temperature sensing bulb, a connecting rod and a lower sliding plug, an inlet pipe and an outlet pipe are arranged on the shell, an annular cavity is formed in the top end of the shell, a diaphragm is arranged in the annular cavity, the temperature sensing bulb is communicated with the upper space of the diaphragm through a copper thin pipe, the connecting rod is arranged in the shell in a sliding mode, and the lower sliding plug is arranged in the shell. The top end of the connecting rod is arranged on the lower surface of the diaphragm, a ball block is arranged at the bottom end of the connecting rod, an upper sliding plug is arranged on the lower surface of the ball block, the upper sliding plug and the lower sliding plug are arranged in the shell in a sliding mode, the upper sliding plug and the lower sliding plug are elastically connected through a spring, and the lower sliding plug ascends and descends in the shell through an adjusting assembly. Through the cooperation of the structures, the temperature control of the motor is more accurate, the temperature fluctuation is prevented from being too large, and the operation stability of equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of cooling capacity control technology, and in particular to a cooling capacity regulation device for a precooling system. Background Technology

[0002] Currently, the TQ valve of the refrigeration unit in the precooling system of the air separation unit is an electronic expansion valve. Due to the long-term operation of the equipment, the expansion valve failure cannot cool the motor in time, causing the refrigeration unit to frequently alarm and shut down. The frequent start and stop of the compressor head will affect the equipment life and operational safety.

[0003] The original electronic expansion valve control method is limited by the accuracy of the sensor and the system response speed, making it difficult to accurately control the motor cooling capacity, resulting in large fluctuations in motor temperature and affecting the stable operation of the equipment.

[0004] Therefore, we propose a precooling system cooling capacity control device to solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a precooling system cooling capacity control device.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a precooling system cooling capacity control device, comprising a housing, a temperature sensing bulb, a connecting rod, and a sliding plug. The housing is provided with an inlet pipe and an outlet pipe. The top of the housing is provided with an annular cavity, and a diaphragm is provided inside the annular cavity. The temperature sensing bulb is connected to the upper space of the diaphragm through a copper thin tube. The connecting rod is slidably disposed within the housing. The top of the connecting rod is disposed on the lower surface of the diaphragm. The bottom of the connecting rod is provided with a ball block. The lower surface of the ball block is provided with an upper sliding plug. Both the upper and lower sliding plugs are slidably disposed within the housing. The upper and lower sliding plugs are elastically connected by a spring. The lower sliding plug moves up and down within the housing through an adjusting component.

[0007] Preferably, a connector is installed at the top of the annular cavity, and one end of the copper capillary is located on the connector.

[0008] Preferably, the ball block is positioned at the junction of the inlet pipe and the outlet pipe.

[0009] Preferably, the upper and lower sliding plugs are each provided with a rubber sealing ring on their contact surfaces with the inner wall of the housing.

[0010] Preferably, the adjustment assembly consists of a base, a base block, a screw, a gear, a gear ring, and a screw seat. The base is located at the bottom opening of the housing, the base block is located on the base, the gear is rotatably located on the base block, the screw seat is rotatably located on the base, the gear ring is located on the outer wall of the screw seat, and the gear and the gear ring are in a gear-tooth meshing state.

[0011] Preferably, the screw is disposed on the lower surface of the sliding plug, and the screw passes through the base and is threadedly engaged with the screw seat.

[0012] Preferably, a slide rod is provided on one side of the lower surface of the sliding plug, and the sliding plug is slidably inserted into the base.

[0013] Preferably, the temperature sensing bulb has a hollow design, and the hollow cavity of the temperature sensing bulb is filled with refrigerant.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] In use, the precooling system cooling capacity control device of this utility model can be installed at a designated location in the compressor motor cooling pipeline of the air separation unit's precooling system via an inlet and outlet pipe. The temperature sensing bulb is directly installed on the compressor motor casing. Under the coolant delivery pressure, the coolant enters the casing through the inlet pipe, then pushes against the ball block and is delivered to the compressor motor's cooling pipeline through the outlet pipe. When the motor temperature changes, the opening degree is controlled based on the temperature of the temperature sensing bulb and the pressure change in the pipeline, thus keeping the motor temperature within the limit range. Specifically:

[0016] When the compressor motor overheats, the temperature of the sensing bulb rises, causing the refrigerant inside to expand due to heat. This refrigerant then enters the annular cavity above the diaphragm through the copper capillary tube. The diaphragm deforms under pressure and moves downwards, pressing against the connecting rod. The connecting rod then drives the ball block downwards, increasing the opening between the inlet and outlet pipes and thus increasing the coolant flow rate. Conversely, when the temperature decreases, the ball block moves upwards under the spring force, reducing the opening of the casing and thus decreasing the coolant flow rate.

[0017] Furthermore, the opening superheat can be changed according to the needs. The power unit drives the gear to rotate, and through the meshing action between the gear and the gear ring, the screw seat is driven to rotate. The screw is restricted and does not rotate. That is, under the principle of the lead screw, the sliding plug is controlled to move up and down. When the sliding plug rises, the spring force increases, the required superheat is higher, and the connection between the inlet pipe and the outlet pipe opens later. Conversely, when the sliding plug falls, the connection between the inlet pipe and the outlet pipe opens earlier. The opening superheat of the shell can be changed by changing the length of the spring to adjust the spring force.

[0018] This invention utilizes a temperature sensing bulb and pressure tapping pipeline to directly sense changes in motor temperature and pressure, and automatically adjusts the opening of the expansion valve based on these parameters to achieve precise control of cooling capacity. This makes motor temperature control more accurate, avoids excessive temperature fluctuations, and improves the stability of equipment operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of the upper structure of the shell of this utility model;

[0022] Figure 4 This is a cross-sectional schematic diagram of the lower part of the shell structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the adjustment component structure of this utility model.

[0024] Figure label:

[0025] 1. Shell; 2. Inlet pipe; 3. Outlet pipe; 4. Annular cavity; 5. Connector; 6. Copper capillary tube; 7. Temperature sensor; 8. Base; 9. Base block; 10. Screw; 11. Diaphragm; 12. Connecting rod; 13. Ball block; 14. Lower sliding plug; 15. Upper sliding plug; 16. Spring; 17. Gear; 18. Sliding rod; 19. Gear ring; 20. Screw seat. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] like Figures 1-5 As shown, the present invention proposes a precooling system cooling capacity control device, including a housing 1, a temperature sensing bulb 7, a connecting rod 12, and a sliding plug 14. The housing 1 is provided with an inlet pipe 2 and an outlet pipe 3. The top of the housing 1 is provided with an annular cavity 4, and a diaphragm 11 is provided in the annular cavity 4. The temperature sensing bulb 7 is connected to the upper space of the diaphragm 11 through a copper thin tube 6. The connecting rod 12 is slidably disposed in the housing 1. The top of the connecting rod 12 is disposed on the lower surface of the diaphragm 11. The bottom of the connecting rod 12 is provided with a ball block 13, which blocks the connection position of the inlet pipe 2 and the outlet pipe 3. The lower surface of the ball block 13 is provided with an upper sliding plug 15. Both the upper sliding plug 15 and the lower sliding plug 14 are slidably disposed in the housing 1. The upper sliding plug 15 and the lower sliding plug 14 are elastically connected by a spring 16. The lower sliding plug 14 moves up and down in the housing 1 through an adjustment component.

[0029] Based on Example 1:

[0030] The housing 1 can be installed at a designated location in the compressor motor cooling pipeline of the air separation unit's precooling system via inlet pipe 2 and outlet pipe 3. The temperature sensing bulb 7 is directly installed on the compressor motor housing. Under the coolant delivery pressure, the coolant enters the housing 1 through inlet pipe 2, then pushes against the ball block 13 and is delivered to the compressor motor cooling pipeline through outlet pipe 3. When the motor temperature changes, the opening degree is controlled based on the temperature of the temperature sensing bulb 7 and the pressure change in the pipeline, keeping the motor temperature within the limit range. Specifically:

[0031] When the compressor motor temperature is overheated, the temperature of the temperature sensing bulb 7 rises, causing the refrigerant inside to expand due to heat and enter the annular cavity 4 above the diaphragm 11 through the copper capillary tube 6. The diaphragm 11 is compressed and deforms downward, thus pressing against the connecting rod 12 and moving downward. The connecting rod 12 drives the ball block 13 downward. At this time, the opening becomes larger, that is, the connection between the inlet pipe 2 and the outlet pipe 3 becomes larger, thereby increasing the flow rate of the coolant. Conversely, when the temperature decreases, the ball block 13 moves upward under the elastic force of the spring 16, reducing the opening of the housing 1, thereby reducing the flow rate of the coolant.

[0032] Furthermore, the opening superheat can be changed according to the needs, and the sliding plug 14 is controlled to move up and down. When the sliding plug 14 rises, the force of the spring 16 increases, the required superheat is higher, and the connection between the inlet pipe 2 and the outlet pipe 3 opens later. Conversely, when the sliding plug 14 moves down, the connection between the inlet pipe 2 and the outlet pipe 3 opens earlier. The opening superheat of the shell 1 can be changed by changing the length of the spring 16 to adjust the force of the spring 16.

[0033] Example 2

[0034] like Figures 1-5 As shown, the present invention proposes a precooling system cooling capacity control device. Compared with Embodiment 1, this embodiment further includes: a connector 5 installed at the top of the annular cavity 4, one end of the copper thin tube 6 being disposed on the connector 5, and rubber sealing rings provided on the contact surfaces of the upper sliding plug 15 and the lower sliding plug 14 with the inner wall of the housing 1. Through the design of the rubber sealing rings, the airtightness of the contact surfaces of the upper sliding plug 15 and the lower sliding plug 14 with the inner wall of the housing 1 is ensured.

[0035] The adjustment assembly consists of a base 8, a base block 9, a screw 10, a gear 17, a gear ring 19, and a screw seat 20. The base 8 is located at the bottom opening of the housing 1, the base block 9 is located on the base 8, the gear 17 is rotatably mounted on the base block 9, the screw seat 20 is rotatably mounted on the base 8, the gear ring 19 is located on the outer wall of the screw seat 20, and the gear 17 and the gear ring 19 are in a gear tooth meshing state. The screw 10 is located on the lower surface of the sliding plug 14, the screw 10 passes through the base 8 and is threadedly meshed with the screw seat 20, and a slide rod 18 is provided on one side of the lower surface of the sliding plug 14. The sliding plug 14 is slidably inserted into the base 8. The power device drives the gear 17 to rotate, and through the meshing action between the gear 17 and the gear ring 19, the screw seat 20 is driven to rotate. The screw 10 is limited and does not rotate, that is, under the principle of the lead screw, the sliding plug 14 is controlled to perform the lifting and lowering action.

[0036] The temperature sensing bulb 7 adopts a hollow design. The hollow cavity of the temperature sensing bulb 7 is filled with refrigerant. When the temperature of the temperature sensing bulb 7 rises, the refrigerant inside expands due to heat and enters the annular cavity 4 above the diaphragm 11 through the copper capillary tube 6.

[0037] The gear 17 of this utility model also needs to be provided with a power device to enable it to work normally. As is well known to those skilled in the art, the provision of such power is commonplace and is a conventional means or common knowledge. It will not be described in detail here. Those skilled in the art can make any selection according to their needs or convenience.

[0038] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A precooling system cooling capacity control device, comprising a housing (1), a temperature sensing bulb (7), a connecting rod (12), and a sliding plug (14), characterized in that: The housing (1) is provided with an inlet pipe (2) and an outlet pipe (3). The top of the housing (1) is provided with an annular cavity (4). A diaphragm (11) is provided in the annular cavity (4). The temperature sensing bulb (7) is connected to the upper space of the diaphragm (11) through a copper tube (6). The connecting rod (12) is slidably disposed in the housing (1). The top of the connecting rod (12) is disposed on the lower surface of the diaphragm (11). The bottom of the connecting rod (12) is provided with a ball block (13). The lower surface of the ball block (13) is provided with an upper sliding plug (15). The upper sliding plug (15) and the lower sliding plug (14) are both slidably disposed in the housing (1). The upper sliding plug (15) and the lower sliding plug (14) are elastically connected by a spring (16). The lower sliding plug (14) moves up and down in the housing (1) through an adjustment component.

2. The precooling system cooling capacity control device according to claim 1, characterized in that: A connector (5) is installed at the top of the annular cavity (4), and one end of the copper tube (6) is located on the connector (5).

3. The precooling system cooling capacity control device according to claim 1, characterized in that: The ball block (13) is blocked at the connection point of the inlet pipe (2) and the outlet pipe (3).

4. The precooling system cooling capacity control device according to claim 1, characterized in that: The upper sliding plug (15) and the lower sliding plug (14) are respectively provided with rubber sealing rings on the contact surfaces with the inner wall of the housing (1).

5. The precooling system cooling capacity control device according to claim 1, characterized in that: The adjustment assembly consists of a base (8), a base block (9), a screw (10), a gear (17), a gear ring (19), and a screw seat (20). The base (8) is located at the bottom opening of the housing (1). The base block (9) is located on the base (8). The gear (17) is rotatably located on the base block (9). The screw seat (20) is rotatably located on the base (8). The gear ring (19) is located on the outer wall of the screw seat (20). The gear (17) and the gear ring (19) are in a gear-tooth meshing state.

6. The precooling system cooling capacity control device according to claim 5, characterized in that: The screw (10) is located on the lower surface of the sliding plug (14), and the screw (10) passes through the base (8) and is threadedly engaged with the screw seat (20).

7. A precooling system cooling capacity control device according to claim 5, characterized in that: The lower surface of the sliding plug (14) is provided with a slide rod (18), and the sliding plug (14) is slidably inserted into the base (8).

8. A precooling system cooling capacity control device according to claim 1, characterized in that: The temperature sensing bulb (7) adopts a hollow design, and the hollow cavity of the temperature sensing bulb (7) is filled with refrigerant.

Images