Liquid spraying valve for low-temperature refrigerating unit

Abstract

The utility model relates to the technical field of refrigeration equipment, in particular to a liquid spray valve for a low-temperature refrigerating unit, which comprises a valve body, a corrugated pipe assembly set, a temperature sensing bag and a liquid guide copper pipe, the corrugated pipe assembly set is mounted on the valve body, an outlet is arranged on one side of the valve body, an inlet is arranged on the other side of the valve body, a valve port is arranged in the valve body, and the outlet and the inlet are communicated with the valve port. A valve element, an adjusting pressure spring and a push rod are arranged in the valve port, the adjusting pressure spring is installed at the bottom of the valve element, the bottom end of the adjusting pressure spring is installed at the bottom of the valve port, the temperature wrap can sense the temperature change of an exhaust port of the compressor, a medium in the temperature wrap expands at the temperature according to the preset opening temperature, and the corrugated pipe is pushed to expand and deform in the axial direction. Therefore, the position of the valve element is changed, the fluid flow is automatically adjusted, intelligent temperature sensing and control are achieved, and the stability and efficiency of a system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a liquid spray valve for a low-temperature refrigeration unit. Background Art

[0002] In cryogenic refrigeration units, the liquid injection valve is a key component whose performance directly affects the operating efficiency and stability of the entire unit. Currently, existing domestic liquid injection valve technology has several significant shortcomings, which limit its effective application in cryogenic refrigeration units.

[0003] First, the valve core of existing spray valves is typically integrated, meaning the valve core and transmission rod are integrally molded. This design presents several issues. First, the large diameter and length ratios between the transmission rod and valve core necessitate increased requirements for machining personnel, processes, and equipment to ensure conformity, such as concentricity, circular runout, and straightness, leading to high component production costs. Second, the high space ratio of the integrated valve core within the valve body results in a short guide hole in the valve body, which ineffectively supports the linear motion of the valve core. This leads to circular oscillation of the valve core during movement, which can lead to jamming or blocking. To address this issue, a rubber member that restricts the integrated valve core must be installed in the already short valve body. This not only increases component cost but also requires a high level of installation experience. Furthermore, the incidence of valve core jamming and blocking remains high. Furthermore, the straightness between the contact point between the integrated valve core push rod and the guide hole support, and the contact line between the push rod end and the valve core end, must be concentric. Otherwise, the valve port is prone to leakage, or the leakage is excessive, increasing energy consumption.

[0004] Secondly, the medium filled in the temperature-sensing package of the existing liquid spray valve is the same as that of the expansion valve, usually refrigerant. This filling method has obvious problems. During the no-load and full-load operation of the refrigeration system, the pressure fluctuation of the compressor suction port is large and the frequency is high. The refrigerant filling method uses the principle of different saturation pressures of refrigerants at different temperatures to push the diaphragm to deform downward, thereby pushing the integrated valve core to move. However, since the pressure of the compressor suction port acts on the lower end face of the diaphragm of the membrane box at the same time, the existing liquid spray valve is greatly affected by the change of the suction port pressure (temperature). This leads to large fluctuations and high frequency in the operation of the valve, making it difficult to stably set the working (spray temperature) state.

[0005] Finally, existing spray valve power heads typically utilize a diaphragm cartridge design. These cartridge-type power heads have a large sensing area, allowing them to react to even small changes in pressure above and below the diaphragm (the pressure differential between the upper and lower pressures). While this improves response sensitivity to a certain extent, it can be a disadvantage in practical applications. Excessive fluctuations in frequency reduce valve stability and shorten the life of the mechanism. Utility Model Content

[0006] (1) Technical problems solved

[0007] In view of the deficiencies in the prior art, the utility model provides a liquid spray valve for a low-temperature refrigeration unit.

[0008] (2) Technical solution

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: The present invention provides a liquid spray valve for a low-temperature refrigeration unit, comprising a valve body, a bellows assembly, a temperature-sensitive package and a liquid-conducting copper tube, the bellows assembly being installed on the valve body, an outlet being provided on one side of the valve body, an inlet being provided on the other side of the valve body, a valve port being provided in the valve body, the outlet and the inlet being connected to the valve port, a valve core, an adjusting compression spring and a push rod being provided in the valve port, the adjusting compression spring being installed at the bottom of the valve core, the bottom end of the adjusting compression spring being installed at the bottom of the valve port, a bellows being installed in the bellows assembly, a liquid-conducting column being provided in the bellows, a bellows guide sleeve being provided at the bottom of the bellows, the bottom of the bellows being connected to the push rod, a filling pipe being provided on the temperature-sensitive package, and the output end of the temperature-sensitive package being connected to the liquid-conducting column through the liquid-conducting copper tube.

[0010] Preferably, an adjusting inner nut is installed at the bottom of the valve body through a threaded structure, the adjusting compression spring is installed on the adjusting inner nut, and a sealing cap is installed at the bottom of the valve body through a threaded structure.

[0011] Further preferably, a filter tube is installed on the inlet of the valve body, a filter screen is installed in the filter tube, and a welding tube is installed at the inlet end of the filter tube.

[0012] Again preferably, a loose nut is installed on the outlet of the valve body.

[0013] Preferably, a liquid tank is provided at the bottom of the inner cavity of the bellows, and the liquid-conducting column is connected to the liquid tank.

[0014] Further preferably, an anti-bending spring is provided at the connecting end of the liquid-conducting copper tube, the temperature-sensing package and the liquid-conducting column.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention provides a liquid spray valve for a low-temperature refrigeration unit, which has the following beneficial effects:

[0017] Intelligent temperature sensing and control:

[0018] The temperature-sensing package can sense the temperature change at the compressor exhaust port, and according to the preset opening temperature, the medium in the temperature-sensing package expands at this temperature, pushing the bellows to expand and deform axially, thereby changing the position of the valve core to automatically adjust the fluid flow, realizing intelligent temperature sensing and control, and improving the stability and efficiency of the system.

[0019] Precise adjustment and flexibility:

[0020] By adjusting the design of the inner nut and the sealing cap, the preload of the compression spring can be precisely adjusted, thereby controlling the opening pressure of the valve core and achieving precise regulation of the fluid flow. This design enhances the flexibility of the valve, making it adaptable to different working requirements.

[0021] Extended service life:

[0022] The design of the filter tube and filter screen effectively filters impurities in the fluid, protecting the valve core and valve body from wear and tear, thereby extending the service life of the valve. This design reduces failures and maintenance costs caused by impurity blockage or wear.

[0023] Easy to maintain and operate:

[0024] The design of the movable nut allows the outlet pipe of the valve body to be quickly adjusted or disassembled, improving the convenience of maintenance. This design simplifies the operation process of the valve and reduces the difficulty and cost of maintenance.

[0025] Improve response speed and sensitivity:

[0026] The design of connecting the liquid tank and the liquid guide column ensures that the liquid guide column can stably transmit pressure changes, improving the response speed and sensitivity of the valve. This design enables the valve to respond more quickly to temperature changes, thereby more accurately controlling fluid flow.

[0027] Enhanced stability of fluid transmission:

[0028] The anti-bend spring design effectively prevents the copper tube from being damaged by bending during installation or use, ensuring the continuity and stability of fluid transmission. This design reduces problems such as fluid leakage or unstable flow caused by damage to the copper tube.

[0029] In summary, the liquid injection valve for cryogenic refrigeration units provides a strong guarantee for the stable operation and efficient work of cryogenic refrigeration units through its beneficial effects such as intelligent temperature sensing and control, precise adjustment and flexibility, extended service life, easy maintenance and operation, improved response speed and sensitivity, and enhanced stability of fluid transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall cross-sectional structure of the utility model;

[0031] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of the utility model;

[0032] Figure 3 This is a schematic diagram of the cross-sectional structure of the bellows housing of the utility model;

[0033] Figure 4 This is a schematic diagram of the assembly structure of the push rod and valve core of the utility model;

[0034] In the figure: 1. Valve body; 2. Bellows sleeve; 3. Temperature-sensing bulb; 4. Valve port; 5. Inlet; 6. Valve core; 7. Outlet; 8. Adjusting compression spring; 9. Adjusting inner nut; 10. Sealing cap; 11. Bellows; 12. Liquid guide column; 13. Bellows sleeve; 14. Push rod; 15. Filter tube; 16. Filter screen; 17. Welding tube; 18. Liquid guide copper tube; 19. Filling tube; 20. Anti-bend spring; 21. Liquid tank; 22. Loose nut. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figure 1-4 , a liquid spray valve for a low-temperature refrigeration unit of the present invention comprises a valve body 1, a bellows 11 assembly, a temperature-sensing package 3 and a liquid guide copper tube 18, the bellows 11 assembly is mounted on the valve body 1, one side of the valve body 1 is provided with an outlet 7, the other side of the valve body 1 is provided with an inlet 5, a valve port 4 is provided in the valve body 1, the outlet 7 and the inlet 5 are connected to the valve port 4, a valve core 6, an adjusting compression spring 8 and a push rod 14 are provided in the valve port 4, the adjusting compression spring 8 is installed at the bottom of the valve core 6, the bottom end of the adjusting compression spring 8 is installed at the bottom of the valve port 4, a bellows 11 assembly is installed in the bellows 11, a liquid guide column 12 is provided in the bellows 11, the bottom of the bellows 11 is provided with a bellows guide sleeve, the bottom of the bellows guide sleeve is connected to the push rod 14, a filling pipe 19 is provided on the temperature-sensing package 3, and the output end of the temperature-sensing package 3 is connected to the liquid guide column 12 through the liquid guide copper tube 18.

[0037] This liquid spray valve for cryogenic refrigeration units is a temperature-sensing flow control device. Its core components include a valve body 1, a bellows assembly 11, a temperature-sensing bulb 3, and a copper liquid guide tube 18. The temperature-sensing bulb 3 is placed at the compressor exhaust port. The valve body 1's inlet 5 is welded to the condenser (or economizer) outlet, and the valve body 1's outlet 7 is screwed to the compressor's inlet pipe. Once the valve body 1 is installed, the fluid within the temperature-sensing bulb 3 expands at this temperature, pushing the bellows 11 axially, pushing the bellows 11 guide sleeve, and pushing the guide rod to apply a force to the valve core 6, which moves away from the valve port 4. When this force exceeds the force applied by the valve core 6's pressure spring 8 to close the valve port 4, the valve core 6 gradually moves away from the valve port 4, opening the valve port 4. The valve core 6 gradually reaches a balance between the opening and closing forces, thereby controlling the fluid flow. Conversely, as the compressor exhaust temperature gradually decreases, the valve core 6 moves toward the valve port 4, gradually reducing the flow rate until it closes.

[0038] The medium in the temperature-sensing package 3 is preferably a mixture of refrigeration oil and a diluent, and the medium can be filled into the temperature-sensing package 3 through the filling pipe 19 .

[0039] Optimal technical solution

[0040] Adjustment of the inner nut 9 and the sealing cap 10:

[0041] Working Principle: An adjusting inner nut 9 is threadedly mounted on the bottom of the valve body 1. An adjusting compression spring 8 is mounted on this nut, allowing for precise adjustment of the spring's preload, thereby controlling the opening pressure of the valve core 6. A sealing cap 10 ensures a tight seal at the bottom of the valve body 1 to prevent leakage.

[0042] Design of filter tube 15 and filter screen 16:

[0043] Working principle: A filter tube 15 is installed at the inlet 5 of the valve body 1, and a filter screen 16 is set inside it, which can effectively filter impurities in the fluid, protect the valve core 6 and the valve body 1 from wear and tear, and extend the service life of the valve.

[0044] Live Zero Nut 22 Design:

[0045] Working principle: A live nut 22 is installed at the outlet 7 of the valve body 1 to facilitate quick adjustment or removal of the outlet 7 pipeline, thereby improving the convenience of maintenance.

[0046] The design of the connection between the liquid tank 21 and the liquid guide column 12:

[0047] Working principle: A liquid tank 21 is provided at the bottom of the inner cavity of the bellows 11, and the liquid guiding column 12 is connected to the liquid tank 21, ensuring that the liquid guiding column 12 can stably transmit pressure changes, thereby improving the response speed and sensitivity of the valve.

[0048] Anti-bend spring 20 design:

[0049] Working principle: An anti-bending spring 20 is installed at the connection end of the liquid-conducting copper tube 18, the temperature-sensing package 3 and the liquid-conducting column 12 to effectively prevent the liquid-conducting copper tube 18 from being damaged due to bending during installation or use, thereby ensuring the continuity and stability of fluid transmission.

[0050] Summarize:

[0051] This cryogenic refrigeration unit's liquid spray valve senses the compressor outlet temperature via a temperature-sensing bulb 3. It transmits pressure changes via a bellows 11 and a liquid guide column 12. This, combined with an adjustable compression spring 8 and valve core 6, achieves precise control of fluid flow. These optimized technical solutions further enhance the valve's accuracy, reliability, ease of maintenance, and service life. When the compressor outlet temperature reaches the set value, the valve automatically opens; as the temperature drops, it gradually closes, achieving intelligent control of fluid flow.

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid spray valve for a low-temperature refrigeration unit, characterized in that: The invention comprises a valve body (1), a bellows (11) assembly, a temperature-sensing package (3) and a liquid-conducting copper tube (18), wherein the bellows (11) assembly is installed on the valve body (1), an outlet (7) is provided on one side of the valve body (1), and an inlet (5) is provided on the other side of the valve body (1), a valve port (4) is provided in the valve body (1), the outlet (7) and the inlet (5) are communicated with the valve port (4), a valve core (6), an adjusting pressure spring (8) and a push rod (14) are provided in the valve port (4), and the adjusting pressure spring (8) is installed at the bottom of the valve core (6), the bottom end of the regulating compression spring (8) is installed at the bottom of the valve port (4), the bellows (11) is installed in the bellows assembly sleeve, a liquid guide column (12) is provided in the bellows (11), the bottom of the bellows (11) is provided with a bellows guide sleeve, the bottom of the bellows guide sleeve is connected to the push rod (14), the temperature sensing package (3) is provided with a filling pipe (19), and the output end of the temperature sensing package (3) is connected to the liquid guide column (12) through a liquid guide copper tube (18).

2. A liquid spray valve for a low-temperature refrigeration unit according to claim 1, characterized in that: The bottom of the valve body (1) is mounted with an adjusting inner nut (9) via a threaded structure, the adjusting compression spring (8) is mounted on the adjusting inner nut (9), and the bottom of the valve body (1) is mounted with a sealing cap (10) via a threaded structure.

3. A liquid spray valve for a low-temperature refrigeration unit according to claim 2, characterized in that: A filter tube (15) is installed on the inlet (5) of the valve body (1), a filter screen (16) is installed in the filter tube (15), and a welding tube (17) is installed at the inlet (5) end of the filter tube (15).

4. A liquid spray valve for a low-temperature refrigeration unit according to claim 3, characterized in that: A loose nut (22) is installed on the outlet (7) of the valve body (1).

5. The liquid spray valve for a low-temperature refrigeration unit according to claim 4, characterized in that: A liquid tank (21) is provided at the bottom of the inner cavity of the bellows (11), and the liquid-conducting column (12) is in communication with the liquid tank (21).

6. The liquid spray valve for a low-temperature refrigeration unit according to claim 5, characterized in that: The connection ends of the liquid-conducting copper tube (18), the temperature-sensing package (3) and the liquid-conducting column (12) are sleeved with anti-bending springs (20).

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