Rotary valve element running-in device for refrigerating machine

Abstract

The rotary valve element running-in device for the refrigerating machine comprises a valve element, a valve seat and a shell, a driving motor capable of driving the valve element to rotate is arranged in the shell, the valve seat and the valve element are coaxially arranged, and the valve seat is connected to the upper side of the valve element in a sliding mode along the axis of the valve element. And an extrusion mechanism capable of extruding the valve seat from top to bottom to enable the lower end of the valve seat to tightly abut against the valve element is detachably arranged on the upper side of the valve seat. The valve seat is connected to the upper side of the valve element in a sliding mode, the extrusion mechanism can apply pre-tightening force from top to bottom to the valve seat, the valve element makes contact with the running-in surface of the valve seat, and the pre-tightening force can be equivalent to the pressure generated by the pressure difference of high-pressure gas and low-pressure gas to the valve element in the running process of the refrigerating machine; and then the driving motor drives the valve element to rotate at a high speed, so that the valve seat and the valve element are in running-in, powder generated in running-in of the valve element and the valve seat can be cleaned in advance, and the situation that the powder enters a refrigerating machine cold head to affect a refrigerating machine during follow-up use is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerator equipment, in particular to a rotary valve core running-in device for a refrigerator. Background Art

[0002] As the core component of the refrigerator, the rotary valve is used to control the timing of high and low pressure gases in the refrigerator. Currently, the refrigerator rotary valve core is made of Rulon (polytetrafluoroethylene material), which has self-lubricating effect.

[0003] This valve has a simple structure but requires high precision. During the operation of the refrigerator, the polytetrafluoroethylene material valve core (rotor) and the metal valve seat (stator) in the rotary valve usually have close planar contact. Due to the gas pressure difference between the upper and lower surfaces of the valve core, there will be a large friction on the contact surface. After long-term operation, the valve core surface will wear. The powder generated by the wear of the valve core enters the cold head of the refrigerator, which will directly affect the performance and reliability of the refrigerator.

[0004] Therefore, a device is needed to run-in the valve seat and valve core for a long time, eliminate the powder generated by valve core wear in advance, and prevent the powder from entering the cold head of the refrigerator and affecting the performance and reliability of the refrigerator. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a rotary valve core running-in device for a refrigerator, which is used to solve the problem in the prior art that powder generated by valve core wear will enter the refrigerator cold head and affect the performance of the refrigerator.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides a valve core running-in device for a rotary valve for a refrigerator, comprising a valve core, a valve seat and a housing, wherein a driving motor capable of driving the valve core to rotate is provided in the housing, the valve seat and the valve core are coaxially arranged, the valve seat is slidingly connected to an upper side of the valve core along the axis of the valve core, and an extrusion mechanism is detachably provided on the upper side of the valve seat, which can squeeze the valve seat from top to bottom so that the lower end of the valve seat is tightly against the valve core.

[0007] By adopting the above technical solution, by sliding the valve seat to the upper side of the valve core, the extrusion mechanism can apply a pre-tightening force from top to bottom to the valve seat, so that the valve core and the valve seat are in contact with the running-in surface, and the pre-tightening force can be equivalent to the pressure generated by the high and low pressure gas pressure difference on the valve core during the operation of the refrigerator. The valve core is then driven by the driving motor to rotate at high speed, so that the valve seat and the valve core are run-in, thereby simulating the operating state of the valve core and the valve seat during the operation of the refrigerator, and the powder generated during the running-in of the valve core and the valve seat can be cleaned in advance to avoid the powder from entering the cold head of the refrigerator during subsequent use and affecting the refrigerator.

[0008] In one embodiment of the present invention, the extrusion mechanism includes a valve seat pressure plate arranged on the upper side of the valve seat, a valve seat limiting plate arranged on the lower side of the valve seat, a first screw connecting the valve seat pressure plate and the valve seat limiting plate, and a cylindrical spring arranged on the upper side of the valve seat pressure plate and sleeved on the outside of the screw, and the valve seat limiting plate is connected to the shell.

[0009] By adopting the above technical solution, the valve body can be slidably connected along the axis of the valve core and between the valve seat pressure plate and the valve seat limit plate. Then, under the elastic action of the cylindrical spring on the valve seat pressure plate, the valve seat pressure plate can squeeze the valve seat from top to bottom, so that the valve seat can tightly contact the upper end face of the valve core.

[0010] In one embodiment of the present invention, a circular groove is provided on the valve seat pressure plate, and the upper end of the valve seat is embedded in the center groove. A threaded hole is also provided on the valve seat pressure plate, and a corresponding positioning hole is provided on the valve seat. A fastener that can be inserted into the positioning hole is provided at the threaded hole to fix the valve seat and the valve seat pressure plate circumferentially.

[0011] By adopting the above technical solution, the valve seat can be positioned circumferentially by fasteners, thereby preventing the valve seat from being deflected when the valve core rotates at high speed, and achieving circumferential fixation of the valve seat.

[0012] In one embodiment of the present invention, multiple groups of first screws are arranged around the valve seat axis, the cylindrical springs are arranged corresponding to the first screws, and the lower ends of the first screws are threadedly engaged with the valve seat limit plate.

[0013] By adopting the above technical solution, the first screw can be evenly distributed around the axis of the valve core, and the cylindrical spring is correspondingly arranged, so that the valve seat pressure plate is more evenly stressed, and the lower end of the first screw is threadedly matched with the valve seat limit plate. The compression amount of the cylindrical spring can be adjusted by screwing the first screw, and then the pre-tightening force of the valve seat pressure plate can be adjusted, so that it can be more adapted to the working state of the refrigerator. The screw connection method is adopted, which facilitates the disassembly of the valve seat pressure plate and is more conducive to the cleaning of powder.

[0014] In one embodiment of the present invention, the valve seat limiting plate has a through groove that is slidably connected to the valve seat along the valve core axis direction, and the valve seat limiting plate is fixedly connected to the housing by a second screw.

[0015] By adopting the above technical solution, the valve seat can be further limited by the through groove, and then the valve seat limiting plate and the shell are fixedly connected by a second screw. The threaded connection method is adopted, so that the valve seat limiting plate and the shell can be detachably connected, which is more convenient for the installation of the valve core and the valve seat.

[0016] In one embodiment of the present invention, multiple groups of second screws are provided around the axis of the valve core, and the lower ends of the second screws are engaged with the threads of the housing.

[0017] By adopting the above technical solution, the connection is made more reliable and stable.

[0018] In one embodiment of the present invention, the valve core is arranged on the motor shaft of the driving motor, and a bearing seat for supporting the valve core is also provided outside the motor shaft of the driving motor. The inner hole of the valve core is installed on the motor shaft of the driving motor, and a cylindrical pin is also provided on the motor shaft to fix the valve core and the motor shaft circumferentially.

[0019] By adopting the above technical solution, the valve core can be correspondingly installed on the motor shaft of the driving motor, and the driving motor can drive the valve core to rotate at high speed.

[0020] As described above, the rotary valve core running-in device for refrigerators of the present invention has the following beneficial effects: by slidingly connecting the valve seat to the upper side of the valve core, the extrusion mechanism can apply a pre-tightening force from top to bottom to the valve seat, so that the valve core contacts the running-in surface of the valve seat, and the pre-tightening force can be equivalent to the pressure generated by the pressure difference of high and low pressure gases on the valve core during the operation of the refrigerator, and then the valve core is driven by the driving motor to rotate at high speed, so that the valve seat and the valve core are run-in, thereby simulating the operating state of the valve core and the valve seat during the operation of the refrigerator, and can clean the powder generated during the running-in of the valve core and the valve seat in advance to avoid the powder from entering the cold head of the refrigerator during subsequent use and affecting the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a cross-sectional view of the overall structure disclosed in an embodiment of the present utility model.

[0022] Figure 2 It shows a schematic diagram of the overall structure disclosed in the embodiment of the present utility model.

[0023] Component number description

[0024] 1. First screw; 2. Flat gasket; 3. Cylindrical spring; 4. Valve seat pressure plate; 5. Valve seat; 6. Second screw; 7. Valve seat limit plate; 8. Valve core; 9. Cylindrical pin; 10. Bearing seat; 11. Plane thrust ball bearing; 12. Torque motor; 13. Housing; 14. Motor power supply connector; 15. Fasteners. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0026] See also Figures 1 to 2. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by this utility model without affecting the efficacy and purpose that can be achieved by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0027] like Figure 1 、 Figure 2 As shown, the utility model provides a running-in device for a rotary valve core 8 for a refrigerator, comprising a valve core 8, a valve seat 5 and a housing 13. A driving motor capable of driving the valve core 8 to rotate is provided in the housing 13. The valve seat 5 is coaxially arranged with the valve core 8. The valve seat 5 is slidably connected to the upper side of the valve core 8 along the axis of the valve core 8. The upper side of the valve seat 5 is detachably provided with an extrusion mechanism capable of squeezing the valve seat 5 from top to bottom so that the lower end of the valve seat 5 is tightly against the valve core 8.

[0028] The extrusion mechanism includes a valve seat pressure plate 4 arranged on the upper side of the valve seat 5, a valve seat limiting plate 7 arranged on the lower side of the valve seat 5, a first screw 1 connecting the valve seat pressure plate 4 and the valve seat limiting plate 7, and a cylindrical spring 3 arranged on the upper side of the valve seat pressure plate 4 and sleeved on the outside of the screw. A flat gasket 2 is also arranged between the first screw 1 and the cylindrical spring 3. The upper side of the cylindrical spring 3 is connected to the flat gasket 2, and the lower end is connected to the valve seat pressure plate 4.

[0029] The valve seat pressure plate 4 has a circular groove, and the upper end of the valve seat 5 is embedded in the center groove. A threaded hole is also provided on the valve seat pressure plate 4, and a corresponding positioning hole is provided on the valve seat 5. A fastener 15 that can be inserted into the positioning hole is provided at the threaded hole to fix the valve seat 5 and the valve seat pressure plate 4 circumferentially. The fastener 15 can be a fastening bolt.

[0030] There are multiple groups of first screws 1 arranged around the axis of the valve seat 5. In this embodiment, four groups are arranged. Four cylindrical springs 3 are arranged corresponding to the first screws 1 and are respectively sleeved on the four first screws 1. The lower end of the first screw 1 is threadedly engaged with the valve seat limit plate 7. The compression amount of the cylindrical spring 3 on the first screw 1 can be adjusted by screwing the first screw 1.

[0031] The valve seat limit plate 7 has a through groove that is slidably connected to the valve seat 5 along the axial direction of the valve core 8. The lower surface of the valve seat limit plate 7 is flush with the lower surface of the valve seat 5. The valve seat limit plate 7 is fixedly connected to the shell 13 by a second screw 6. There are multiple groups of second screws 6 around the axis of the valve core 8. In this embodiment, four groups are provided and are evenly distributed around the axis of the valve core 8. The lower end of the second screw 6 is threadedly engaged with the shell 13.

[0032] The first screw 1 and the second screw 6 are both hexagon socket head screws.

[0033] The drive motor is installed in the housing 13, and the motor shaft of the drive motor is set upward. The valve core 8 is coaxially arranged on the motor shaft of the drive motor. A bearing seat 10 for supporting the valve core 8 is also provided outside the motor shaft of the drive motor. A plane thrust bearing is correspondingly provided in the bearing seat 10, and the shaft ring of the plane thrust bearing is installed in cooperation with the motor shaft, and the seat ring of the plane thrust bearing is installed on the bearing seat 10.

[0034] The inner hole of the valve core 8 is installed on the motor shaft of the driving motor, and the motor shaft is also provided with a cylindrical pin 9 for fixing the valve core 8 and the motor shaft in the circumferential direction.

[0035] A motor power supply connector 14 is further provided on the lower side of the driving motor, and the motor power supply connector 14 is mounted on the housing 13 .

[0036] The valve core 8 can rotate at high speed after the driving motor is powered on and starts to run in with the valve seat 5. The speed of the driving motor can be adjusted by an external frequency converter.

[0037] To sum up, the utility model can apply a top-down pre-tightening force to the valve seat 5 by the extrusion mechanism through the sliding connection of the valve seat 5 to the upper side of the valve core 8, so that the valve core 8 contacts the running-in surface of the valve seat 5, and the pre-tightening force can be equivalent to the pressure generated on the valve core 8 by the pressure difference between high and low pressure gases during the operation of the refrigerator, and then the valve core 8 is driven by the driving motor to rotate at high speed, so that the valve seat 5 and the valve core 8 are run-in. After the valve core 8 and the valve seat 5 have been run-in for a period of time, the extrusion mechanism on the valve seat 5 can be removed to clean the powder generated during the running-in process.

[0038] Therefore, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A rotary valve core running-in device for a refrigerator, comprising a valve core, a valve seat and a housing, characterized in that: A driving motor capable of driving the valve core to rotate is provided in the shell, the valve seat and the valve core are coaxially arranged, the valve seat is slidingly connected to the upper side of the valve core along the axis of the valve core, and the upper side of the valve seat is detachably provided with an extrusion mechanism capable of squeezing the valve seat from top to bottom so that the lower end of the valve seat is tightly against the valve core.

2. The rotary valve core running-in device for refrigerator according to claim 1, characterized in that: The extrusion mechanism includes a valve seat pressure plate arranged on the upper side of the valve seat, a valve seat limiting plate arranged on the lower side of the valve seat, a first screw connecting the valve seat pressure plate and the valve seat limiting plate, and a cylindrical spring arranged on the upper side of the valve seat pressure plate and sleeved on the outside of the screw, and the valve seat limiting plate is connected to the shell.

3. The rotary valve core running-in device for refrigerator according to claim 2, characterized in that: The valve seat pressure plate has a circular groove, the upper end of the valve seat is embedded in the center groove, the valve seat pressure plate is also provided with a threaded hole, and the valve seat is correspondingly provided with a positioning hole, and the threaded hole is provided with a fastener that can be inserted into the positioning hole to fix the valve seat and the valve seat pressure plate circumferentially.

4. The rotary valve core running-in device for refrigerator according to claim 2, characterized in that: The first screws are arranged in multiple groups around the valve seat axis, the cylindrical springs are arranged corresponding to the first screws, and the lower ends of the first screws are threadedly engaged with the valve seat limiting plate.

5. The rotary valve core running-in device for refrigerator according to claim 2, characterized in that: The valve seat limiting plate is provided with a through groove which is slidably connected to the valve seat along the valve core axis direction, and the valve seat limiting plate is fixedly connected to the housing via a second screw.

6. The rotary valve core running-in device for refrigerator according to claim 5, characterized in that: Multiple groups of the second screws are arranged around the valve core axis, and the lower ends of the second screws are engaged with the shell threads.

7. The rotary valve core running-in device for refrigerator according to claim 1, characterized in that: The valve core is arranged on the motor shaft of the driving motor. A bearing seat for supporting the valve core is also provided outside the motor shaft of the driving motor. The inner hole of the valve core is installed on the motor shaft of the driving motor, and a cylindrical pin is also provided on the motor shaft to fix the valve core and the motor shaft circumferentially.

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