Vacuum pressure switch applied to refrigerator

Abstract

The utility model belongs to the technical field of vacuum pressure switches, and particularly relates to a vacuum pressure switch applied to a refrigerator. The air cover is fixedly installed below the switch base, a containing cavity is formed in the air cover and the switch base, and the diaphragm piece is located in the containing cavity and divides the containing cavity into an upper cavity and a lower cavity. The PCB and the on-off mechanism are located in the upper cavity, a connector is arranged on one side of the PCB, an elastic piece is arranged on the other side of the PCB, and the on-off mechanism is located on the elastic piece side; the jacking mechanism located in the lower cavity conducts jacking or retreating motion due to the change of the pressure intensity in the refrigerator negative pressure fresh-keeping chamber and drives the on-off mechanism to extrude or loosen the elastic piece. Compared with the prior art, the pressure control structure has the beneficial effects that the pressure control structure is modularly designed, so that the assembly and after-sales maintenance and replacement of a product are facilitated, and the production cost is reduced; the pressure change control is realized by the spring, the elastic sheet and the diaphragm sheet, the attenuation is smaller, the control precision of the product is improved, and the service life of the product is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum pressure switch technology, specifically relating to a vacuum pressure switch used in refrigerators. Background Technology

[0002] Most household refrigerators nowadays have a negative pressure preservation function, which is generally 0.8 atmospheres. The negative pressure function is achieved by a pressure detection mechanism that sends a feedback signal to the control module. The control module controls the opening and closing of the vacuum pump based on the pressure feedback signal to compensate for the changes in negative pressure caused by leakage after long-term use.

[0003] Traditional refrigerators incorporate a pressure transmission mechanism within the refrigerator body. This mechanism is controlled by a metal spring. Initially, the spring presses against a piston plate, which in turn compresses a push rod. The push rod contacts a switch on the circuit board, putting the switch on. When the pressure difference between atmospheric pressure and negative pressure exceeds the spring's elasticity, the spring deforms and no longer applies pressure to the piston plate. The piston plate also stops applying pressure to the push rod, and the switch springs back up, disconnecting the circuit. The vacuum pump then stops working. Over time, as the negative pressure inside the refrigerator increases and the pressure difference with atmospheric pressure becomes insufficient to compress the spring, the spring resets, pushing the piston plate and further moving the push rod, triggering the switch to close the circuit. The vacuum pump then starts pumping out negative pressure. When the negative pressure reaches a certain value, the disconnection logic repeats. The shortcomings of this existing technology are: 1. The entire pressure control structure is integrated into the refrigerator unit, making assembly and after-sales maintenance inconvenient, resulting in low production efficiency, high after-sales maintenance costs, and complex operation. 2. Traditional designs rely solely on the elasticity of metal springs to sense pressure, resulting in poor accuracy. Furthermore, metal springs are prone to fatigue and have a short lifespan, leading to significant pressure decay over time. As the pressure decreases, the controllable negative pressure value increases, affecting the refrigerator's preservation effect. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a vacuum pressure switch for use in refrigerators, which enables product modularization and improves the product's control accuracy and service life.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A vacuum pressure switch applied to a refrigerator includes: a switch base, a PCB board, a diaphragm, a switching mechanism, a lifting mechanism, and an air cover; the air cover is fixedly installed below the switch base, and the two form a cavity inside. The diaphragm is located in the cavity and divides the cavity into an upper cavity communicating with the atmosphere and a lower cavity communicating with the negative pressure preservation compartment of the refrigerator; the PCB board and the switching mechanism are located in the upper cavity. One side of the PCB board is provided with a connector for connecting to the wiring harness of the whole machine, and the other side is provided with a spring piece that can be elastically deformed to realize the switching of the circuit in the PCB board. The switching mechanism is located on the side of the spring piece; the lifting mechanism is located in the lower cavity. The lifting mechanism generates a lifting or retracting movement due to the pressure change inside the negative pressure preservation compartment of the refrigerator, and drives the switching mechanism to squeeze or release the spring piece.

[0006] Furthermore, the spring sheet protrudes in the middle; the on / off mechanism is positioned directly opposite the protruding part of the spring sheet; the lifting mechanism includes an elastic element, which is positioned directly opposite the on / off mechanism.

[0007] Furthermore, the lifting mechanism also includes a piston plate, which is nail-shaped with a flat head at one end and a rod at the other end; the air cover has a tubular air inlet facing downwards, and a lower retaining platform is provided inside the air cover; the elastic element is sleeved on the rod, and the end of the rod extends into the air inlet.

[0008] Furthermore, the air cover is provided with an upper locking platform, which is located above the lower locking platform, and the diaphragm is embedded in the upper locking platform.

[0009] Furthermore, the end of the nail rod has a flat design.

[0010] Furthermore, the outer side of the air inlet near the end has an outward protrusion forming a locking protrusion.

[0011] Furthermore, the elastic element is a spring.

[0012] Furthermore, the switching mechanism includes a push rod, which is nail-like.

[0013] Furthermore, the upper cavity includes a clamping ring, one end of which abuts against the diaphragm and the other end against the PCB board. The clamping ring has an opening in the middle, and the on / off mechanism is installed at the opening.

[0014] Furthermore, a groove is provided in the middle of the outer side of the clamping ring, and an O-ring is installed in the groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: the pressure control structure is modularly designed, which facilitates product assembly and after-sales maintenance and replacement, and reduces production costs; the implementation method of the pressure control module is optimized. This vacuum pressure switch can control the vacuum pump according to the pressure change of the negative pressure preservation chamber. The pressure change control is achieved by spring, spring sheet and diaphragm sheet together, which has a longer life, less attenuation, better consistency of batch products, improves the control accuracy and service life of the product, and improves the preservation effect of the refrigerator. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is the front view of this utility model;

[0018] Figure 3 yes Figure 2 Sectional view at point AA;

[0019] Figure 4 This is a practical explosion diagram.

[0020] In the picture:

[0021] 1. Switch base, 2. PCB board, 3. Push rod, 4. Diaphragm, 5. Spring, 6. Gas cover, 7. Cavity, 8. Pressure ring, 9. Piston plate, 10. O-ring

[0022] 201. Connector; 202. Spring;

[0023] 601. Upper card platform; 602. Lower card platform; 603. Air inlet; 604. Card protrusion.

[0024] 701. Upper cavity; 702. Lower cavity.

[0025] 901. Nail flat head; 902. Nail rod. Detailed Implementation

[0026] To facilitate understanding of this utility model, it will be described in more detail below with reference to the accompanying drawings and specific embodiments. However, this utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0027] Example 1: Combination Figure 1-3Understanding a vacuum pressure switch used in a refrigerator: a switch base 1, a PCB board 2, a diaphragm 4, an on / off mechanism, a lifting mechanism, and an air cover 6; the switch base 1 serves as the main support for all components, providing support and fixation; the air cover 6 communicates with the internal environment to be monitored and also acts as the outer casing for the entire switch, threadedly installed below the switch base 1, the two forming a cavity 7; the diaphragm 4 is located within the cavity 7 and divides the cavity 7 into an upper cavity 701 communicating with the atmosphere and a lower cavity 702 communicating with the refrigerator's negative pressure preservation compartment; the PCB board 2... The switching mechanism is located in the upper cavity 701. The PCB board 2 has a connector 201 soldered on the top and a spring contact 202 soldered on the bottom. The connector 201 is plugged into the wiring harness of the whole machine to realize signal transmission. The spring contact 202 is deformed by compression to realize the connection and disconnection of the two ends of the line in the PCB board 2. The switching mechanism is located on the side of the spring contact 202. The lifting mechanism is located in the lower cavity 702. The lifting mechanism generates lifting or retraction movement due to the pressure change inside the negative pressure preservation compartment of the refrigerator, and drives the switching mechanism to squeeze or release the spring contact 202.

[0028] Working principle description: The entire vacuum pressure switch is divided into two chambers by the diaphragm 4. The upper chamber 701 is connected to atmospheric pressure, and the lower chamber 702 is connected to the negative pressure preservation compartment of the refrigerator through the air cover 6. In the initial state, the lifting mechanism lifts the switching mechanism upwards, which compresses the spring 202. The deformation of the spring 202 causes the circuit at both ends of the PCB board 2 to conduct, meaning the switch is in the open state. At this time, the refrigerator starts the vacuum pump to evacuate the freshness compartment. When a certain negative pressure is reached, typically 0.8 atmospheres, the pressure difference between the two chambers becomes large enough to create a negative pressure suction force, causing the lifting mechanism to retract. The spring 202 loses its compressive force and automatically recovers, disconnecting the circuit at both ends of the PCB board 2, meaning the switch is in the off state. The vacuum pump stops working, and the freshness compartment is in a negative pressure preservation state. Over time, leakage may occur in the negative pressure compartment. When the pressure increases, the lifting mechanism will lift upwards again, repeating the initial working process and creating a circuit for vacuuming. This cycle continues. Through this cycle, the pressure in the freshness compartment is stably controlled at 0.8 atmospheres, achieving better preservation functionality in the refrigerator.

[0029] Example 2: Based on the structure of Example 1, the spring piece 202 protrudes in the middle; the switching mechanism includes a push rod 3, which is nail-like, with its end facing the protruding part of the spring piece 202; the lifting mechanism includes a spring 5, which faces the flat end of the push rod 3. The spring piece 202 protrudes towards the PCB board 2, and its edge is welded during fixing. There is a gap between the protrusion and the PCB board 2. Under the pressure transmitted by the spring 5 and the push rod 3, the protrusion increases until it contacts the PCB board 2, making the circuit conductive; when the pressure is removed, it deforms and recovers under its own elasticity, thus detaching from the PCB board 2, and the circuit is disconnected.

[0030] Example 3: Combination Figure 3-4 Understanding that, based on the structure of Embodiment 2, the lifting mechanism further includes a piston plate 9, which is nail-like, with one end being a flat head 901 and the other end being a rod 902, the end of which is flat; the air cover 6 has a tubular air inlet 603 facing downwards, and the outer side of the air inlet 603 near its end has an outward protrusion forming a locking protrusion 604; the air cover 6 has an upper locking platform 601 and a lower locking platform 602 inside, the upper locking platform 601 being located above the lower locking platform 602, and the diaphragm 4 being embedded in the upper locking platform 601; the spring 5 is sleeved on the rod 902, the end of which extends into the air inlet 603, and the outer diameter of the end of the rod 902 is smaller than the inner diameter of the air inlet 603, i.e., a gas channel is left between them. Figure 3 As shown, the nail rod 902 is conical near the nail head 901 and cylindrical away from the nail head 901, with the outer diameter of the conical part being larger than that of the cylindrical part. The upper cavity 701 includes a clamping ring 8, one end of which abuts against the diaphragm 4, and the other end against the PCB board 2. The clamping ring 8 clamps and fixes the PCB board 2 and the connector 201, etc., onto the switch base 1. The clamping ring 8 has a central opening, where the switching mechanism is installed. A groove is provided in the center of the outer side of the clamping ring 8, where an O-ring 10 is installed. The O-ring 10 is fixed to the clamping ring 8 and cooperates with the switch base 1 to provide a seal. The spring 202 is made of SUS301 material, the spring 5 is made of SUS304 material, and the diaphragm 4 is made of EPDM material. The switch base 1, the top rod 3, the clamping ring 8, the gas cap 6, and the piston plate 9 can be made of PC material.

[0031] Assembly Instructions: First, solder the connector 201 to one side of the PCB board 2, and solder the spring piece 202 to the other side. Then, place it into the switch base 1. Next, insert the O-ring 10 into the groove of the clamping ring 8 and place it into the switch base 1 to press down the PCB board 2. Then, insert the push rod 3 into the opening in the middle of the clamping ring 8, and then place the diaphragm 4 on top. Next, put the spring 5 on the pin 902 of the piston plate 9, with the end of the pin 902 extending into the air interface 603. Finally, engage or thread the switch base 1 with the air cover 6 for fixed installation, completing the assembly of the entire vacuum pressure switch.

[0032] In use, the air cap 6 is connected to the refrigerator's negative pressure preservation compartment via the air inlet 603. The circuit on the PCB board 2 is connected to the control circuit of the vacuum pump, which is used to evacuate the refrigerator's negative pressure preservation compartment. Initially, there is no pressure difference between the two chambers. The spring 5 naturally extends to provide initial pressure to the piston plate 9, which in turn provides pressure to the diaphragm plate 4. The push rod 3 cooperates with the diaphragm plate 4. When squeezed by the diaphragm plate 4, the push rod 3 pushes upward against the spring plate 202, triggering the circuit on the PCB board 2 to conduct, so that the entire switch is initially in the pressed state, and the vacuum pump performs evacuation. When a pressure difference occurs between the two chambers, the diaphragm 4 will be subjected to negative pressure suction. As the pressure difference gradually increases, the suction also increases. The piston plate 9 retracts, and the spring 5 is compressed. The compression increases to the point that the diaphragm 4 disengages from the top rod 3. The spring plate 202, under its own elastic force, pushes the top rod 3 away, disconnecting the circuit on the circuit board and stopping the vacuum pump. This indicates that the refrigerator's negative pressure preservation chamber has reached the set negative pressure value, such as 0.8 atmospheres. At this time, the gas channel between the end of the nail rod 902 and the gas interface 603 is blocked by the conical section, reaching an equilibrium state and performing negative pressure preservation.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A vacuum pressure switch applied to a refrigerator, characterized in that, The utility model relates to a refrigerator switch, which comprises a switch base, a PCB board, a diaphragm, an on-off mechanism, a lifting mechanism and a gas cover. The gas cover is fixedly installed below the switch base, and the two form a cavity inside. The diaphragm is located in the cavity and separates the cavity into an upper cavity in communication with the atmosphere and a lower cavity in communication with the negative pressure fresh-keeping chamber of the refrigerator. The PCB board and the on-off mechanism are located in the upper cavity. The PCB board is provided with a connector on one side for connecting with the wire harness end of the whole machine and is provided with an elastic sheet on the other side for realizing the on-off of the circuit in the PCB board.

2. The vacuum pressure switch for use on a refrigerator according to claim 1, wherein The lifting mechanism is located in the lower cavity.

3. The vacuum pressure switch for use on a refrigerator as defined in claim 2, wherein, The lifting mechanism produces lifting or retraction movement due to the change of the internal pressure of the negative pressure fresh-keeping chamber of the refrigerator and drives the on-off mechanism to press or release the elastic sheet.

4. The vacuum pressure switch for use on a refrigerator as defined in claim 3, wherein, The middle part of the elastic sheet is convex.

5. The vacuum pressure switch for use on a refrigerator as defined in claim 3, wherein, The on-off mechanism is arranged opposite the convex part of the middle part of the elastic sheet.

6. The vacuum pressure switch for use on a refrigerator as defined in claim 3, wherein, The lifting mechanism comprises an elastic member, and the elastic member is arranged opposite the on-off mechanism.

7. The vacuum pressure switch for use on a refrigerator as claimed in any one of claims 2 to 6, wherein, The lifting mechanism further comprises a piston sheet.

8. The vacuum pressure switch for use on a refrigerator as defined in claim 2, wherein, The piston sheet is in the shape of a nail.

9. The vacuum pressure switch for use on a refrigerator as defined in claim 1, wherein, The gas cover is provided with a tubular gas interface downward.

10. The vacuum pressure switch for use on a refrigerator as defined in claim 9, wherein, The gas cover is provided with an upper clamping table inside. The piston sheet is embedded in the upper clamping table. The end of the piston sheet is designed as a flat surface. The outer side of the gas interface is provided with a clamping convex part outwardly protruding near the end. The elastic member is a spring. The on-off mechanism comprises a lifting rod. The upper cavity comprises a compression ring. One end of the compression ring abuts against the diaphragm, and the other end abuts against the PCB board. The middle part of the compression ring is provided with a groove. An O-ring is installed in the groove.

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