A refrigeration compressor suction pressure control device

Abstract

The present application relates to refrigeration compressor technical field, specifically to a kind of refrigeration compressor suction pressure control device, including valve core main body and filter barrel main body, valve core main body is installed in the inside of filter barrel main body, the surface of the filter barrel main body is equipped with air inlet, the bottom of the filter barrel main body is equipped with air outlet.In the present application, the blind cover is connected with barrel body by fixing bolt and nut, and the sealing ring between the two ensures the system sealing and leakproofness.The corrugated pipe built-in valve core main body and main spring cooperate, the opening pressure under high pressure difference is reduced by the multi-stage valve piece linkage design, and the system reliability is improved.The device is installed in the existing suction filter barrel inside, and the installation, maintenance and adjustment are facilitated, and the practicability and maintenance convenience are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration compressor, in particular to a refrigeration compressor suction pressure control device. BACKGROUND

[0002] In a refrigeration system, the actual operating power of the motor of various fixed frequency and fixed capacity type refrigeration compressors is closely related to the suction pressure. When operating under high suction pressure, it is easy to cause motor overcurrent and burn the coil. In order to solve this problem, a suction pressure control valve is usually installed on the suction pipeline of the refrigeration compressor to adjust the refrigerant flow (i.e. pressure control) entering the refrigeration compressor, so as to control the safe operation of the compressor motor under the condition of not exceeding the rated current, and achieve the purpose of protecting the compressor motor.

[0003] The existing refrigeration compressor suction pipeline pressure control valve has a pressure change sensing component such as an elastic metal sheet or a thin-walled bellows. This device is sealed with external air by means of a screw filler or a flange gasket. There is a risk of hidden refrigerant leakage. The elastic metal sheet or thin-walled bellows is deformed for a long time, and the damage rate is high. There is also a risk of refrigerant leakage. Refrigerant is colorless and odorless. Only when the system is not normal can it attract the attention of the user, but it is too late. After repair, a large amount of refrigerant needs to be supplemented to make the system work normally, polluting the atmospheric environment and increasing production costs.

[0004] Some pressure control devices have an air passage to facilitate the deformation of the elastic metal sheet and the thin-walled bellows. However, when the refrigeration system is a low-temperature freezer or freezer, the pressure control valve on the refrigeration suction pipeline is in a low-temperature state, and its outer surface will be frosted and iced as a whole. Water vapor in the air will also enter the device storing the pressure sensing component through the air passage, and also be frosted and iced inside. When the amount of accumulation reaches a certain amount, it will cause the elastic metal sheet or the thin-walled bellows to fail and lose the pressure regulating function.

[0005] Large pressure control valves are generally pilot-operated, and the secondary component drives the main valve core to act. Its structure is complex, the manufacturing process is difficult, the production cost is high, and the price is very expensive. There are also large direct-acting pressure control valves. In order to ensure the flow of refrigerant, the diameter of the valve core must be made very large. When the refrigerant pressure in the refrigeration system is very high, the pressure difference between the inlet end and the outlet end of the valve core is very large. This requires that the pressure sensing components such as bellows and main springs must be increased in size and thickness to balance the pressure difference of the valve core and meet the requirement of opening and closing the valve core. This will inevitably lead to an increase in the size and cost of the direct-acting valve during manufacturing, and the price is also quite expensive. SUMMARY

[0006] The purpose of the present application is to solve the technical problems raised in the background.

[0007] The application adopts the following technical scheme: a refrigeration compressor suction pressure control device, comprising a valve core body and a filter barrel body, the valve core body is installed in the inside of the filter barrel body, characterized in that: the surface of the filter barrel body is provided with an air inlet, the bottom of the filter barrel body is provided with an air outlet, the top of the filter barrel is fixedly installed with a blind cover, the inside of the valve core body is fixedly installed with a bellows, the inside of the bellows is fixedly installed with a main spring, the inside of the valve core body is fixedly installed with a limiting circular plate, the upper surface of the bellows is fixedly installed with a valve rod, the top end of the valve rod is fixedly installed with a cylindrical rod, the surface of the valve rod is fixedly installed with a primary valve piece, the surface of the valve rod is slidably connected with a secondary valve piece, the surface of the valve rod is linkage installed with a tertiary valve piece, and the secondary valve piece and the tertiary valve piece are fixedly installed with a linkage bolt, the surface of the valve core body is provided with a No. 1 air flow vent, the surface of the limiting circular plate is provided with a No. 2 air flow vent, the bottom of the valve core body is provided with a No. 3 air flow vent, the bottom of the valve core body is inserted with a pressure adjusting screw rod, and the surface of the pressure adjusting screw rod is threadedly connected with a screw rod locking nut.

[0008] Preferably, the surface of the blind cover is inserted with a fixing bolt, the surface of the fixing bolt is threadedly connected with a nut, and the blind cover and the filter barrel body have a sealing ring. Here, the connection between the blind cover and the filter barrel body is more stable.

[0009] Preferably, the secondary valve piece and the limiting circular plate are connected with an auxiliary spring. Here, when the suction pressure is low, the primary valve piece, the secondary valve piece and the tertiary valve piece do not vibrate with each other, wear and noise are reduced, and the service life of the equipment is prolonged.

[0010] Preferably, the primary valve piece is a pair of locking nuts. Here, the components of the device are simplified, and the valve piece is easier to install and replace.

[0011] Preferably, the bottom surface of the valve core body is provided with an O-shaped sealing ring, and the O-shaped sealing ring is attached to the inner wall of the filter barrel body. Here, gas leakage is effectively prevented, the sealing property of the system is ensured, the air inlet and the air outlet are isolated, and the sealing device is not only the O-shaped sealing ring, but also a sealing gasket, a sealing strip or other sealing materials.

[0012] Preferably, a sealing gasket is arranged between the pressure adjusting screw rod and the screw rod locking nut. Here, the gas inside the bellows is isolated from the external refrigerant gas, an independent closed space is formed inside the bellows, the bellows deforms in real time in response to external pressure changes, and the pressure adjusting function is realized together with the main spring.

[0013] Preferably, the bellows and valve stem are built into the filter housing, and the filter housing is filled with refrigerant gas. This helps to isolate the bellows and valve stem from the air, preventing refrigerant leakage and icing on the outside of the bellows.

[0014] Preferably, the primary, secondary, and tertiary valves are interconnected, opening or closing sequentially according to changes in the intake pressure. Here, the greater the suction flow of the refrigeration compressor and the greater the difference between the evaporator pressure and the set control pressure, the more valve stages are selected, and vice versa; thus, the opening pressure of each valve stage is kept within a reasonable range, improving system reliability.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0016] 1. The blind cover is securely connected using fixing bolts and nuts. The sealing ring between the blind cover and the filter body ensures the system's airtightness and leak-proof performance. Simultaneously, the bellows and main spring within the unit work together to maintain the system near the set suction pressure by automatically adjusting the valve position, ensuring stable compressor operation. The bellows is entirely located inside the system, directly contacting the refrigerant gas and avoiding contact with the outside atmosphere, thus preventing refrigerant leakage and pressure control failure caused by frost and ice buildup.

[0017] 2. A multi-stage valve plate linkage design is adopted, with the valve plate area decreasing at each stage. This reduces the main spring pressure required to open the valve core under high pressure differential, resulting in a smaller device size, lower cost, and reduced valve core surge, thus improving system reliability. The pressure regulating screw device can adjust the deformation of the main spring to ensure precise control of the intake pressure. The screw is fixed in position by a locking nut to prevent the adjustment settings from changing due to vibration or natural loosening during use.

[0018] 3. The design fully utilizes the existing structure of the intake filter cartridge, installing it inside the cartridge and improving upon the existing filtration system to further reduce production costs. This design also prevents vibration between valve plates, reducing wear and noise and extending equipment lifespan. The entire unit uses bolts and nuts to easily install, maintain, and adjust the protective pressure value, significantly improving practicality and ease of maintenance.

[0019] 4. The bellows and valve stem are completely built into the filter barrel, isolated from the air, and surrounded by refrigerant gas, preventing refrigerant leakage and icing inside the bellows.

[0020] 5. The primary, secondary, and tertiary valves are interconnected, opening and closing sequentially. It should be noted that the interconnected valve system is not necessarily three-stage; it could be a single primary stage, a two-stage system, or even four or five stages of interconnected valves. This depends on the refrigeration compressor's suction flow rate and the difference between the evaporator pressure and the set control pressure. A higher flow rate results in a larger difference, requiring more valve stages, and vice versa. This ensures that the opening pressure of each valve stage remains within a reasonable range, improving system reliability. Attached Figure Description

[0021] Fig. 1 This invention provides a schematic diagram of the device structure for a refrigeration compressor suction pressure control device;

[0022] Fig. 2 This invention provides a schematic diagram of the suction filter barrel structure of a refrigeration compressor suction pressure control device;

[0023] Fig. 3 This invention provides a schematic diagram of the suction filter assembly structure of a refrigeration compressor suction pressure control device.

[0024] Legend:

[0025] 1. Bellows; 2. Limiting circular plate; 3. Pressure regulating screw; 4. Main spring; 5. Three-stage valve plate; 6. Two-stage valve plate; 7. Cylindrical rod; 8. First-stage valve plate; 9. Screw locking nut; 10. O-ring seal; 11. Auxiliary spring; 12. Filter barrel body; 13. Blind cover; 14. Fixing bolt; 15. Nut; 16. Valve stem; 17. Sealing gasket; 18. Valve core body; 19. No. 1 air passage vent; 20. No. 2 air passage vent; 21. No. 3 air passage vent; 22. Air inlet; 23. Air outlet; 24. Linkage bolt; 25. Sealing ring. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0028] Example

[0029] Please see Figs. 1-3The present invention provides a technical solution: a refrigeration compressor suction pressure control device, including a valve core body 18 and a filter barrel body 12. The valve core body 18 is installed inside the filter barrel body 12. An air inlet 22 is opened on the surface of the filter barrel body 12, and an air outlet 23 is opened at the bottom of the filter barrel body 12. A blind cover 13 is fixedly installed on the top of the filter barrel body 12. A fixing bolt 14 is inserted into the surface of the blind cover 13, and a nut 15 is threadedly connected to the surface of the fixing bolt 14 to ensure a more stable connection between the blind cover 13 and the filter barrel body 12. The sealing ring 25 between the two ensures the system's sealing and leak-proof performance. A bellows 1 is fixedly installed inside the valve core body 18, and a main spring 4 is fixedly installed inside the bellows 1. A limit plate 2 is fixedly installed inside the valve core body 18. A valve stem 16 is fixedly installed on the upper surface of the bellows 1, and a cylindrical rod 7 is fixedly installed on the top of the valve stem 16. A primary valve plate 8, a sliding secondary valve plate 6, and a linkage tertiary valve plate 5 are fixedly installed on the surface of the valve stem 16. An auxiliary spring 11 connects the secondary valve plate 6 and the limit plate 2 to prevent the primary valve plate 8, the secondary valve plate 6, and the tertiary valve plate 5 from vibrating against each other when the suction pressure is low, thereby reducing wear and noise. It can also reduce wear during long-term use and extend the service life of the equipment. The primary valve plate 8 consists of a pair of locking nuts. The components of the device have been simplified, making the valve plate easier to install and replace. A first air passage 19 is provided on the surface of the valve core body 18, a second air passage 20 is provided on the surface of the limiting circular plate 2, and a third air passage 21 is provided at the bottom of the valve core body 18. A pressure regulating screw 3 is inserted into the bottom of the valve core body 18, and a screw locking nut 9 is threaded onto the surface of the pressure regulating screw 3. A sealing gasket 17 is provided between the pressure regulating screw 3 and the screw locking nut 9 to ensure that the gas inside the bellows 1 is isolated from the external refrigerant gas. An independent, sealed space is formed inside the bellows 1, which deforms in real time in response to changes in external pressure, thus achieving pressure regulation together with the main spring 4. An O-ring 10 is provided on the bottom surface of the valve core body 18, and the O-ring 10 fits snugly against the inner wall of the filter body 12, effectively preventing gas leakage, ensuring the system's airtightness, and isolating the inlet 22 and outlet 23.

[0030] Working principle: High-pressure refrigerant gas enters the filter through inlet 22, passes through the combination of primary valve plate 8, secondary valve plate 6, and tertiary valve plate 5, and then through the first and second airflow channels to the periphery of bellows 1. The high pressure compresses bellows 1 along with the main spring 4, causing valve stem 16 to move downward, which in turn moves primary valve plate 8, secondary valve plate 6, and tertiary valve plate 5 toward the first airflow port 19. When the pressure generated by the high-pressure refrigerant on bellows 1, valve stem 16, and primary valve plate 8 exceeds the elastic force of the main spring 4, primary valve plate 8, secondary valve plate 6, and tertiary valve plate 5 will press tightly against the upper end of the first airflow port 19, and the primary valve plate 8, secondary valve plate 6, and tertiary valve plate 5 will be completely closed.

[0031] When the refrigeration compressor starts working, the refrigerant gas outside the first air passage 19, the second air passage 20, the third air passage 21, and the bellows 1 is quickly drawn away by the refrigeration compressor from the outlet 23. The refrigerant gas pressure decreases, the force on the top of the bellows 1 decreases, the main spring 4 drives the bellows 1 to begin to extend, the valve stem 16 moves upward, driving the first-stage valve plate 8 to move upward. The refrigerant gas flows in from the quincunx-shaped notch of the second-stage valve plate 6 near the valve stem 16, and then flows into the bellows 1 through the first air passage 19. The refrigerant gas pressure increases here, the bellows 1 contracts under force, causing the first-stage valve plate 8 to move downward, reducing the refrigerant gas flow into the bellows 1. Finally, after the forces between the bellows 1 and the main spring 4, and between the first-stage valve plate 8 and the valve stem 16 are balanced, the suction pressure is maintained near the set value. At this time, the second-stage valve plate 6 and the third-stage valve plate 5 are in the closed state under the high pressure of the refrigerant gas.

[0032] As the refrigeration compressor continues to run, the temperature in the storage room decreases, and the suction pressure decreases accordingly. When the pressure drops to the point where even the fully open primary valve 8 cannot maintain the set suction pressure, the cylindrical rod 7 fixed on the valve stem 16 will push the secondary valve 6 to move in the opening direction. The gradual opening of the secondary valve 6 increases the intake area, thus still allowing the compressor to operate efficiently at the set pressure. At this time, the bottom of the linkage bolt 24 fixed on the secondary valve 6 is not in contact with the tertiary valve 5, and the linkage bolt 24 does not provide opening force to the tertiary valve 5. The tertiary valve 5 is only subject to the refrigerant pressure difference and is in contact with the first airflow channel 19, remaining in the closed state.

[0033] When the intake pressure decreases further, even if the first-stage valve 8 and the second-stage valve 6 are fully open simultaneously, the set suction pressure cannot be met. The valve stem 16 continues to move upwards, and the bottom of the linkage bolt 24 between the second-stage valve 6 and the third-stage valve 5 exerts an upward pulling force on the third-stage valve 5, gradually opening it and moving it away from the first gas flow port 19. This further increases the refrigerant gas flow rate and maintains a constant suction pressure. The linkage bolt 24 and the second-stage valve 6 are fixed together with a threaded nut, while the third-stage valve 5 can slide freely between itself and the linkage bolt 24.

[0034] When the top of the bellows 1 contacts the limiting circular plate 2, the third-stage valve 5 is also fully opened. As the refrigeration compressor runs, the temperature in the storage room drops further, and the suction pressure also drops below the set value. The main spring 4 keeps the first-stage valve 8, the second-stage valve 6, and the third-stage valve 5 fully open until the refrigeration compressor stops, thus completing the suction pressure control task.

[0035] When the temperature inside the refrigeration unit suddenly rises, the intake pressure rises to above the set suction pressure value. The top of the bellows 1 experiences increased force, which overcomes the elastic force of the main spring 4 and begins to drive the valve stem 16 downward. This causes the first-stage valve plate 8, the second-stage valve plate 6, and the third-stage valve plate 5 to move towards the closing direction, thereby controlling the compressor suction pressure at the set value and thus protecting the refrigeration compressor.

[0036] The pressure regulating screw 3 can adjust the deformation of the main spring 4, thereby adjusting the suction pressure protection value. After adjusting the protection pressure, the sealing gasket 17 is placed on the screw and the screw locking nut 9 is used to lock it. This can fix the position of the pressure regulating screw 3 and isolate the gas inside the bellows 1 from the external refrigerant gas, forming an independent closed body, so that the bellows 1 can achieve the expansion and contraction function when the external pressure changes.

[0037] The first-stage valve plate 8 can be moved up and down appropriately on the valve stem 16 before tightening, so as to achieve the purpose of finely adjusting the suction pressure setting value.

[0038] The auxiliary spring 11 is used to prevent the primary valve plate 8, the secondary valve plate 6 and the tertiary valve plate 5 from vibrating against each other when the intake pressure is very low, thereby reducing wear and noise.

[0039] By making full use of the existing air intake filter barrel's fixing bolts 14 and nuts 15, the blind cover 13 can be disassembled and assembled, making it convenient and feasible to install, maintain, or adjust the protection pressure value of the device of the present invention.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A refrigeration compressor suction pressure control device comprising a valve spool body (18) and a filter bowl body (12), the valve spool body (18) being mounted inside the filter bowl body (12), characterized in that: The surface of the filter barrel body (12) is provided with an air inlet (22), the bottom of the filter barrel body (12) is provided with an air outlet (23), the top of the filter barrel (12) is fixedly installed with a blind cover (13), the inside of the valve core body (18) is fixedly installed with a bellows (1), the inside of the bellows (1) is fixedly installed with a main spring (4), the inside of the valve core body (18) is fixedly installed with a limiting circular plate (2), the upper surface of the bellows (1) is fixedly installed with a valve rod (16), the top end of the valve rod (16) is fixedly installed with a cylindrical rod (7), the surface of the valve rod (16) is fixedly installed with a primary valve piece (8), the surface of the valve rod (16) is slidably connected with a secondary valve piece (6), the surface of the valve rod (16) is linkage installed with a tertiary valve piece (5), and the secondary valve piece (6) and the tertiary valve piece (5) are fixedly installed with a linkage bolt (24), the surface of the valve core body (18) is provided with a first airflow vent hole (19), the surface of the limiting circular plate (2) is provided with a second airflow vent hole (20), the bottom of the valve core body (18) is provided with a third airflow vent hole (21), the bottom of the valve core body (18) is inserted with a pressure adjusting screw rod (3), and the surface of the pressure adjusting screw rod (3) is threadedly connected with a screw rod locking nut (9).

2. The refrigerant compressor suction pressure control apparatus of claim 1, wherein: The surface of the blind cover (13) is inserted with a fixing bolt (14), the surface of the fixing bolt (14) is threadedly connected with a nut (15), and the blind cover (13) and the filter barrel body (18) have a sealing ring (25).

3. The refrigerant compressor suction pressure control apparatus of claim 1 wherein: The secondary valve piece (6) and the limiting circular plate (2) are connected with an auxiliary spring (11).

4. The refrigeration compressor suction pressure control apparatus of claim 1, wherein: The primary valve piece (8) is a pair of locking nuts.

5. The refrigeration compressor suction pressure control apparatus of claim 1, wherein: The bottom surface of the valve core body (18) is provided with an O-shaped sealing ring (10), and the O-shaped sealing ring (10) is attached to the inner wall of the filter barrel body (12).

6. The refrigeration compressor suction pressure control apparatus of claim 1, wherein: The pressure adjusting screw rod (3) and the screw rod locking nut (9) are provided with a sealing gasket (17).

7. The refrigeration compressor suction pressure control apparatus of claim 1, wherein: The bellows (1) and the pressure adjusting screw rod (3) are built in the inside of the filter barrel body (12), and the inside of the filter barrel body (12) is filled with refrigerator gas.

8. The refrigeration compressor suction pressure control apparatus of claim 1, wherein: The primary valve piece (8), the secondary valve piece (6) and the tertiary valve piece (5) are linkage with each other, and are opened or closed step by step according to the change of the air inlet pressure.

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