Rotary scavenging air valve and refrigeration equipment

Abstract

The utility model relates to the related technical field of low-temperature equipment, and provides a rotary scavenging air valve and refrigeration equipment, the rotary scavenging air valve comprises a valve cylinder assembly, a valve core, a valve seat, a driving motor and an elastic pre-tightening structure, a valve cavity is arranged in the valve cylinder assembly, the valve core is arranged in the valve cavity, the valve core moves up and down relative to the valve cavity, and the valve core and the valve cylinder assembly are fixed in the circumferential direction; the valve seat is arranged in the valve cavity and can rotate relative to the valve cavity, and a first airflow path and a second airflow path are formed among the valve cylinder assembly, the valve element and the valve seat; the driving motor is in transmission connection with the valve seat so as to switch the first air flow path and the second air flow path, the elastic pre-tightening structure acts on the valve element so as to keep the valve element and the valve seat in an elastic pre-clinging state, friction force between the valve element and the valve seat is even, the valve element is made of extremely abrasion-resistant materials according to needs, and therefore the valve element is made of the abrasion-resistant materials. The defect that valve element abrasive particles enter a refrigerating machine in the long-time operation process is effectively overcome, the load of a driving motor is reduced, and the valve seat can rotate in any direction and angle.

Description

Technical Field

[0001] The utility model relates to the technical field related to low-temperature equipment, in particular to a rotary air exchange valve and refrigeration equipment. Background Art

[0002] Dilution refrigerator is a high-end scientific research instrument that can provide an environment close to absolute zero. It is widely used in scientific research fields such as condensed matter physics, material science, particle physics and even astronomical detection. For example, the GM type low-temperature refrigerator, which is a pulse tube refrigerator, uses a valve switching device between the mechanical compressor and the refrigerator to achieve the compression and expansion process of the gas in the refrigerator by controlling the opening and closing of the high and low pressure valves, thereby obtaining a refrigeration effect.

[0003] In the related art, the valve switching device is generally a rotary air exchange valve. Studies have shown that high inflation pressure has obvious benefits in improving the cooling capacity of GM-type low-temperature refrigerators. However, while obtaining a larger cooling capacity, high inflation pressure will cause the valve core of the rotary air exchange valve to be between a higher high and low pressure difference. The valve core rotation needs to overcome a greater friction force, causing severe wear. At the same time, it requires the drive motor connected to the valve core to provide a greater torque, causing the drive motor to be overloaded. When the refrigerator runs for a long time, the problem of valve core wear becomes more prominent, which requires the use of wear-resistant materials, but such materials often do not have lubricity, which in turn requires the drive motor to have a greater torque, falling into a vicious circle; and when it is running for a long time, there is a disadvantage that valve core abrasive particles enter the refrigerator. Utility Model Content

[0004] The utility model provides a rotary air exchange valve, which is used to solve the problems of wear of the valve core of the rotary air exchange valve, excessive load of the driving motor and valve core abrasive particles entering into the refrigerator in the related technology.

[0005] The utility model provides a rotary air exchange valve, comprising:

[0006] A valve cylinder assembly, wherein a valve cavity is arranged in the valve cylinder assembly;

[0007] A valve core, the valve core is arranged in the valve cavity, the valve core moves up and down relative to the valve cavity, and the valve core and the valve cylinder assembly are both circumferentially fixed;

[0008] a valve seat, the valve seat being arranged in the valve cavity, the valve seat being rotatable relative to the valve cavity, a first gas flow path for high-pressure gas flow and a second gas flow path for low-pressure gas flow being formed between the valve cylinder assembly, the valve core and the valve seat;

[0009] a driving motor, the driving motor being drivingly connected to the valve seat to drive the valve seat to rotate relative to the valve cavity to switch the first air flow path and the second air flow path;

[0010] An elastic pre-tightening structure is provided between the valve core and the valve cylinder assembly, and acts on the valve core to keep the valve core and the valve seat in an elastic pre-tightening and fitting state.

[0011] According to a rotary air exchange valve provided by the utility model, the elastic pre-tightening structure includes a spring member, and the spring member is located between an end surface of the valve core away from the valve seat and the valve cylinder assembly.

[0012] According to a rotary air exchange valve provided by the utility model, a first groove is provided on the valve cylinder assembly, and a second groove is provided on an end surface of the valve core away from the valve seat;

[0013] The elastic preload structure also includes a first plate and a second plate. The first plate is fixedly connected to one end of the spring member, and the second plate is fixedly connected to the other end of the spring member. The first plate is adapted and plug-fitted to the first groove, and the second plate is adapted and plug-fitted to the second groove.

[0014] According to a rotary air exchange valve provided by the utility model, the drive motor is located outside the valve cavity of the valve cylinder assembly.

[0015] According to a rotary ventilation valve provided by the utility model, a pin is provided on the output shaft of the drive motor, the center line of the output shaft of the drive motor and the center line of the pin are perpendicular to each other, and the length of the pin in the axial direction is greater than the diameter of the output shaft of the drive motor;

[0016] The valve seat is provided with a transmission groove, the transmission groove is located on an end surface of the valve seat facing the drive motor, and the transmission groove cooperates with the output shaft of the drive motor and the pin shaft to form a structure that is compatible.

[0017] According to a rotary air exchange valve provided by the utility model, the valve cylinder assembly is provided with a high-pressure air inlet hole, a low-pressure air return hole and a vent hole;

[0018] The valve core is provided with an air passage with one end open, the valve seat is provided with a high-pressure air passage and a low-pressure air passage, the high-pressure air passage and the low-pressure air passage are arranged at intervals, and the valve seat rotates relative to the valve core so that the valve seat has a first working angle for high-pressure operation and a second working angle for low-pressure operation;

[0019] When the valve seat is located at the first working angle, the high-pressure air inlet hole, the high-pressure air flow channel, the air channel and the air hole are connected to form the first air flow path; when the valve seat is located at the second working angle, the air hole, the air channel, the low-pressure air flow channel and the low-pressure air return hole are connected to form the second air flow path.

[0020] According to a rotary air exchange valve provided by the utility model, the high-pressure air passage comprises a first high-pressure air passage and a second high-pressure air passage communicating with the first high-pressure air passage, and the low-pressure air passage comprises a first low-pressure air passage and a second low-pressure air passage communicating with the first low-pressure air passage;

[0021] Among them, the first high-pressure air channel and the first low-pressure air channel are both vertically arranged on the valve seat, the second high-pressure air channel and the second low-pressure air channel are both horizontally arranged on the valve seat, and the center line angle between the second high-pressure air channel and the second low-pressure air channel is 180 degrees.

[0022] According to a rotary air exchange valve provided by the utility model, a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring are arranged between the valve seat and the valve cylinder assembly, and the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are sheathed on the outer wall of the valve seat;

[0023] The first sealing ring and the second sealing ring are respectively located on two opposite sides of the second high-pressure air passage, and the third sealing ring and the fourth sealing ring are respectively located on two opposite sides of the second low-pressure air passage.

[0024] According to a rotary air exchange valve provided by the utility model, one of the inner wall of the valve cavity of the valve cylinder assembly and the valve core is provided with a square convex frame, and the other of the inner wall of the valve cavity of the valve cylinder assembly and the valve core is provided with a square clamping groove, and the square convex frame and the square clamping groove are both clamped and can be moved up and down to cooperate;

[0025] Wherein, the square convex frame and the square clamping groove cooperate to surround the elastic pre-tightening structure.

[0026] The utility model also provides a refrigeration device, comprising:

[0027] The above-mentioned rotary ventilation valve;

[0028] A compressor, wherein the compressor is provided with a high-pressure gas outlet and a low-pressure gas return, the high-pressure gas outlet is communicated with the first gas flow path, and the low-pressure gas return is communicated with the second gas flow path;

[0029] A refrigerator, wherein a gas delivery end of the refrigerator is communicated with the valve cavity of the valve cylinder assembly.

[0030] The utility model provides a rotary air exchange valve, in which the valve core is circumferentially fixed in the valve cavity, and the valve seat rotates relative to the valve cavity and is connected to the driving motor. During the operation of the rotary air exchange valve, the driving motor rotates to drive the valve seat to rotate, thereby realizing the switching of the first air flow path and the second air flow path, that is, the switching of high and low pressures. By providing an elastic pre-tightening structure, the valve core does not need to be rotated and can move up and down. The elastic pre-tightening structure makes the valve core and the valve seat elastically pre-tightened and fit together. Therefore, when the valve seat and the valve core rotate relative to each other, under the elastic action of the elastic pre-tightening structure and without the need for the valve core to rotate, the friction between the valve core and the valve seat is relatively uniform. Therefore, the valve core can be made of extremely wear-resistant materials as needed, which effectively avoids the disadvantage that valve core abrasive particles enter the refrigerator during long-term operation, and does not require the driving motor to have a larger torque, which is beneficial to reducing the load of the driving motor, and the valve seat can rotate in any direction and angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a structural schematic diagram of the rotary air exchange valve provided by the utility model;

[0033] Figure 2 This is a first-view exploded schematic diagram of the rotary air exchange valve provided by the utility model;

[0034] Figure 3 This is a second perspective exploded schematic diagram of the rotary air exchange valve provided by the utility model;

[0035] Figure 4 It is a partial structural cross-sectional schematic diagram of the rotary air exchange valve provided by the utility model;

[0036] Figure 5 yes Figure 4 A schematic diagram of the structure enlargement in the middle;

[0037] Figure 6 It is a schematic diagram of the structure of the refrigeration equipment provided by the utility model.

[0038] Reference numerals:

[0039] 100, valve cylinder assembly; 110, valve chamber; 120, first groove; 130, high-pressure air inlet hole; 140, low-pressure air return hole; 150, vent hole; 160, square convex frame; 170, cylinder body; 171, chamber; 180, cylinder cover; 181, concave cavity;

[0040] 200, valve core; 210, second groove; 220, air passage; 230, square card slot;

[0041] 300, valve seat; 310, transmission groove; 320, high-pressure air channel; 321, first high-pressure air channel; 322, second high-pressure air channel; 330, low-pressure air channel; 331, first low-pressure air channel; 332, second low-pressure air channel;

[0042] 400, driving motor; 410, output shaft; 420, pin; 500, elastic preload structure; 510, spring member; 520, first plate; 530, second plate; 610, first sealing ring; 620, second sealing ring; 630, third sealing ring; 640, fourth sealing ring; 650, end face sealing ring;

[0043] 710, high pressure vent connector; 720, low pressure vent connector; 730, rolling bearing;

[0044] 800, compressor; 900, refrigerator. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] In the related art, the valve core of the rotary ventilation valve is usually made of polymer wear-resistant material, and the valve seat is usually made of metal material. Since the valve core made of polymer wear-resistant material generally does not have lubricity, the valve core must overcome a large friction force when rotating relative to the valve seat. At the same time, it is also necessary for the drive motor connected to the valve core in the related art to have a large torque.

[0047] Combine the following Figure 1-Figure 6 The utility model describes a rotary air exchange valve and a refrigeration device.

[0048] Reference Figures 1 to 5According to the utility model, a rotary air exchange valve is provided, including a valve cylinder assembly 100, a valve core 200, a valve seat 300, a drive motor 400 and an elastic preload structure 500. A valve cavity 110 is arranged in the valve cylinder assembly 100, the valve core 200 is arranged in the valve cavity 110, the valve core 200 moves up and down relative to the valve cavity 110, and the valve core 200 and the valve cylinder assembly 100 are circumferentially fixed; the valve seat 300 is arranged in the valve cavity 110, the valve seat 300 can rotate relative to the valve cavity 110, the valve cylinder assembly 100, the valve core 200 is arranged in the valve cavity 110, the valve core 200 moves up and down relative to the valve cavity 110, and the valve cylinder assembly 100 and the valve core 200 are circumferentially fixed. A first air flow path for high-pressure gas flow and a second air flow path for low-pressure gas flow are formed between 200 and the valve seat 300; a drive motor 400 is transmission-connected to the valve seat 300 to drive the valve seat 300 to rotate relative to the valve cavity 110 to switch the first air flow path and the second air flow path, and an elastic pre-tightening structure 500 is disposed between the valve core 200 and the valve cylinder assembly 100, and the elastic pre-tightening structure 500 acts on the valve core 200 to keep the valve core 200 and the valve seat 300 in an elastically pre-tightened fit state.

[0049] The utility model provides a rotary air exchange valve, in which the valve core 200 is circumferentially fixed in the valve cavity 110, and the valve seat 300 rotates relative to the valve cavity 110 and is connected to the driving motor 400. During the operation of the rotary air exchange valve, the driving motor 400 rotates to drive the valve seat 300 to rotate, so as to realize the switching of the first air flow path and the second air flow path, that is, the switching of high and low pressures. By providing an elastic pre-tightening structure 500, the valve core 200 does not need to rotate and can move up and down. The elastic pre-tightening structure 500 makes the valve core 200 and the valve seat 300 elastic. The valve seat 300 and the valve core 200 are pre-tightened and fit together, so when the valve seat 300 and the valve core 200 rotate relative to each other, under the elastic action of the elastic pre-tightening structure 500 and the valve core 200 does not need to rotate, the friction between the valve core 200 and the valve seat 300 is relatively uniform. Therefore, extremely wear-resistant materials can be used as needed to effectively avoid the disadvantage that abrasive particles of the valve core 200 enter the refrigerator 900 during long-term operation, and there is no need for the drive motor 400 to have a larger torque, which is beneficial to reducing the load of the drive motor 400, and the valve seat 300 can rotate in any direction and angle.

[0050] It should be noted that in the embodiment of the utility model, the above-mentioned rotary ventilation valve is a cylindrical structure; the valve seat 300 can be made of aluminum alloy, stainless steel, 40Cr and other materials; the valve core 200 is made of a polymer wear-resistant material; and under the action of the elastic pre-tightening structure 500, the valve core 200 can move along its axial direction to maintain a close fit with the valve seat 300.

[0051] It is understandable that, referring to Figure 6In the embodiment of the utility model, the refrigeration equipment includes the above-mentioned rotary exchange valve, a compressor 800 and a refrigerator 900. The compressor 800 is provided with a high-pressure gas outlet and a low-pressure gas return end. The high-pressure gas outlet is connected to the first gas flow path, and the low-pressure gas return end is connected to the second gas flow path. The gas delivery end of the refrigerator 900 is connected to the valve cavity 110 of the valve cylinder assembly 100. When working, the compressor 800 transmits the compressed working gas to the rotary exchange valve via the high-pressure pipe connected to the high-pressure gas outlet, and then transmits it to the refrigerator 900 by the rotary exchange valve. The working gas after the system circulation of the entire refrigerator 900 returns to the compressor 800 through the low-pressure pipe connected to the low-pressure gas outlet via the rotary exchange valve. It should also be noted that in this embodiment, the working gas can be a gas such as helium, or a fluorine-containing refrigerant.

[0052] It is understandable that, referring to Figures 2 to 5 In the embodiment of the utility model, the elastic pre-tightening structure 500 includes a spring member 510, and the spring member 510 is located between an end surface of the valve core 200 away from the valve seat 300 and the valve cylinder assembly 100. With the above structure, the force applied by the spring member 510 on the valve core 200 makes the valve core 200 and the valve seat 300 pre-tightly fit, and the valve core 200 and the valve seat 300 maintain sufficient contact pressure to prevent medium leakage; as the use time increases, the spring member 510 can automatically adjust as needed to compensate for the wear between the valve core 200 and the valve seat 300 and keep the two closely fitted. The spring member 510 can absorb part of the vibration and impact energy, reduce damage to the valve and related components, and has a simple structure and low manufacturing cost. Of course, in some embodiments, the elastic pre-tightening structure 500 includes an elastic sheet to achieve a close fit between the valve core 200 and the valve seat 300.

[0053] Specifically, refer to Figures 2 to 5 In the embodiment of the utility model, a first groove 120 is provided on the valve cylinder assembly 100, and a second groove 210 is provided on an end surface of the valve core 200 away from the valve seat 300; the elastic preload structure 500 also includes a first plate 520 and a second plate 530, the first plate 520 is fixedly connected to one end of the spring member 510, the second plate 530 is fixedly connected to the other end of the spring member 510, the first plate 520 is adapted and plug-in matched with the first groove 120, and the second plate 530 is adapted and plug-in matched with the second groove 210. With the above structure, the first plate 520 is matched with the first groove 120, and the second plate 530 is matched with the second groove 210. The shape and size of the above grooves limit the movement range of the plate, play a certain limiting role, and maintain the relatively stable position of the elastic preload structure 500, the valve core 200, and the valve seat 300.

[0054] It should be noted that in the embodiment of the utility model, the first groove 120 is located in the middle of the valve cylinder assembly 100, and the second groove 210 is located in the middle of the valve core 200, so that the spring member 510 is located in the center position, which is conducive to balanced force on the valve core 200.

[0055] It is understandable that, referring to Figures 1 to 3 as well as Figure 6 In the embodiment of the utility model, the drive motor 400 is located outside the valve cavity 110 of the valve cylinder assembly 100. It can be understood that one end of the valve cavity 110 has an opening, and the output shaft 410 of the drive motor 400 is connected to the valve seat 300 through the opening of the valve cavity 110. With the above structure, the drive motor 400 is arranged outside the valve cavity 110 to avoid the drive motor 400 working in a high-pressure environment, which is conducive to ensuring the life of the drive motor 400. It should also be noted that in some embodiments, since the drive motor 400 is located outside the valve cavity 110, the corresponding motor type and combination can be selected according to needs; the type of the above drive motor 400 is a stepper motor.

[0056] It is understandable that, referring to Figure 2 and Figure 3 In the embodiment of the utility model, a pin shaft 420 is provided on the output shaft 410 of the driving motor 400, the center line of the output shaft 410 of the driving motor 400 and the center line of the pin shaft 420 are perpendicular to each other, and the axial length of the pin shaft 420 is greater than the diameter of the output shaft 410 of the driving motor 400; a transmission groove 310 is provided on the valve seat 300, and the transmission groove 310 is located on one end surface of the valve seat 300 facing the driving motor 400, and the transmission groove 310 cooperates with the output shaft 410 and the pin shaft 420 of the driving motor 400 to form a compatible structure.

[0057] By adopting the above structure, the pin shaft 420 is inserted into the transmission groove 310 of the valve seat 300 to realize the transmission of the valve seat 300. The output shaft 410 of the drive motor 400 and the pin shaft 420 are perpendicular to each other, which can reduce the energy loss in the transmission process and make the transmission more stable. The valve seat 300 is provided with a transmission groove 310, and the transmission groove 310 is located on the end face of the valve core 200 facing the drive motor 400, which helps to increase the contact area and improve the transmission range of the drive motor 400 to the valve seat 300, thereby helping to improve the transmission torque.

[0058] It should be noted that the output shaft 410 and the pin shaft 420 of the above-mentioned drive motor 400 are an integrated structure, or are fixedly connected by welding, or are detachably fixedly connected by bolts or the like; the axial length of the above-mentioned pin shaft 420 is greater than the diameter of the output shaft 410 of the drive motor 400.

[0059] It is also understandable that, with reference to Figures 1 to 4 and Figure 6 In the embodiment of the utility model, the valve cylinder assembly 100 is provided with a high-pressure air inlet hole 130, a low-pressure air return hole 140 and an air vent 150; the valve core 200 is provided with an air vent 220 with an opening at one end, and the valve seat 300 is provided with a high-pressure air flow channel 320 and a low-pressure air flow channel 330, and the high-pressure air flow channel 320 and the low-pressure air flow channel 330 are arranged at intervals, and the valve seat 300 rotates relative to the valve core 200 so that the valve seat 300 has a first working angle for high-pressure operation and a second working angle for low-pressure operation; when the valve seat 300 is located at the first working angle, the high-pressure air inlet hole 130, the high-pressure air flow channel 320, the air vent 220 and the air vent 150 are connected to form a first air flow path; when the valve seat 300 is located at the second working angle, the air vent 150, the air vent 220, the low-pressure air flow channel 330 and the low-pressure air return hole 140 are connected to form a second air flow path.

[0060] With the above structure, when working, the valve seat 300 is located at a first working angle, and the high-pressure gas flows through the high-pressure air inlet hole 130, the high-pressure air flow channel 320, the air channel 220 and the air channel 150 in sequence, and enters the refrigerator 900; the valve seat 300 is located at a second working angle, and the low-pressure gas flows through the air channel 150, the air channel 220, the low-pressure air flow channel 330 and the low-pressure air return hole 140 in sequence, and enters the compressor 800; and the valve core 200 has only one air channel 220 with an open end. When the high pressure is turned on, the low pressure is completely closed, and vice versa. That is, the first air flow path and the second air flow path are not connected to each other, which can effectively avoid high and low pressure cross-talk.

[0061] It should be noted that high pressure and low pressure are defined based on relative concepts and are used to describe working under different pressure conditions.

[0062] Specifically, refer to Figures 2 to 4 In the embodiment of the utility model, the high-pressure air channel 320 includes a first high-pressure air channel 321 and a second high-pressure air channel 322 connected to the first high-pressure air channel 321, and the low-pressure air channel 330 includes a first low-pressure air channel 331 and a second low-pressure air channel 332 connected to the first low-pressure air channel 331; wherein the first high-pressure air channel 321 and the first low-pressure air channel 331 are both vertically arranged on the valve seat 300, and the second high-pressure air channel 322 and the second low-pressure air channel 332 are both horizontally arranged on the valve seat 300, and the centerline angle between the second high-pressure air channel 322 and the second low-pressure air channel 332 is 180 degrees. With the above structure, the valve seat 300 can be rotated to 180 degrees to switch the working pressure environment, the structure is simple, easy to process, and can effectively avoid high and low pressure cross-flow.

[0063] It should also be noted that in the embodiment of the present invention, since the centerline angle between the second high-pressure air duct 322 and the second low-pressure air duct 332 is 180 degrees, in order to meet the operating frequency of the pulse tube refrigerator 900, for example, 1 to 3 Hz, the speed of the drive motor 400 needs to run at 100 r / min, avoiding the resonance frequency of the drive motor 400 and greatly reducing vibration.

[0064] Specifically, refer to Figures 2 to 4 In the embodiment of the utility model, a first sealing ring 610, a second sealing ring 620, a third sealing ring 630 and a fourth sealing ring 640 are provided between the valve seat 300 and the valve cylinder assembly 100, and the first sealing ring 610, the second sealing ring 620, the third sealing ring 630 and the fourth sealing ring 640 are respectively arranged on the outer wall of the valve seat 300; wherein, the first sealing ring 610 and the second sealing ring 620 are respectively located on the opposite sides of the second high-pressure air passage 322, and the third sealing ring 630 and the fourth sealing ring 640 are respectively located on the opposite sides of the second low-pressure air passage 332.

[0065] By adopting the above structure, the positions of the first sealing ring 610 and the second sealing ring 620, as well as the positions of the third sealing ring 630 and the fourth sealing ring 640, the second high-pressure air channel 322 and the second low-pressure air channel 332 of the valve seat 300 are in a sealed separation, and are sealed by multiple dynamic sealing rings to prevent high and low pressures from mixing with each other, which can effectively improve the refrigeration efficiency; in low-temperature quantum experiments, the interference caused by vibration is effectively reduced to ensure accurate measurement results.

[0066] Specifically, refer to Figures 2 to 4 In the embodiment of the utility model, the inner wall of the valve cavity 110 of the valve cylinder assembly 100 is provided with a square convex frame 160, and the valve core 200 is provided with a square clamping groove 230. The square convex frame 160 and the square clamping groove 230 are clamped and matched to move up and down; wherein, the square convex frame 160 and the square clamping groove 230 are matched to surround the elastic pre-tightening structure 500. Through the above structure, not only the square convex frame 160 and the square clamping groove 230 are clamped and matched to limit the rotation of the valve core 200 relative to the valve cavity 110, but also the square convex frame 160 and the square clamping groove 230 are clamped and matched to surround the elastic pre-tightening structure 500, which plays a role in protecting the elastic pre-tightening structure 500, thereby improving the stability and reliability of the operation of the rotary air exchange valve.

[0067] Specifically, refer to Figures 1 to 6In the embodiment of the utility model, the valve cylinder assembly 100 includes a cylinder body 170 and a cylinder cover 180, the cylinder body 170 is provided with a chamber 171 with openings at two opposite ends, the cylinder cover 180 is provided with a concave cavity 181, the cylinder cover 180 is fixedly connected to one end of the cylinder body 170 by bolts and other fixing parts, and the chamber 171 and the concave cavity 181 cooperate to form a valve cavity 110, wherein a square convex frame 160 is provided on the bottom wall in the concave cavity 181, a square groove is provided on the lower end surface of the valve core 200, and the first groove 120 is located in the square convex frame 160, and the second groove 210 is located in the area surrounded by the square groove, with a simple structure and reasonable design.

[0068] Of course, in some embodiments, the square convex frame 160 can also be provided on the lower end surface of the valve core 200, and the square groove is provided on the bottom wall of the cavity 181. It should be noted that, in some embodiments, the valve core 200 and the valve cylinder assembly 100 can also be fixedly matched by a triangle or other form of clamping.

[0069] It is understandable that in the embodiment of the utility model, rolling bearings 730 are provided at opposite ends of the cylinder body 170 , and opposite ends of the valve seat 300 cooperate with two rolling bearings 730 respectively, which is beneficial to improve the rotation smoothness and stability of the valve seat 300 .

[0070] It should also be noted that, referring to Figures 1 to 4 as well as Figure 6 In the present embodiment, the high-pressure air inlet hole 130 and the low-pressure air return hole 140 are both arranged on the cylinder body 170, and a high-pressure air vent joint 710 and a low-pressure air vent joint 720 are screwed on the cylinder body 170, the high-pressure air vent joint 710 is inserted into the high-pressure air inlet hole 130, and the low-pressure air vent joint 720 is inserted into the low-pressure air return hole 140; the air vent 150 is located on the side wall of the cylinder head 180; an end face sealing ring 650 for sealing the gap between the cylinder body 170 and the cylinder head 180 is provided between the relative end faces of the cylinder body 170 and the cylinder head 180, and the sealing performance is ensured by adopting multiple dynamic sealing rings and end face sealing rings 650 inside the cylinder body 170, and at the same time, the gap between the valve seat 300 and the cylinder body 170 is ensured by processing, which can effectively reduce the leakage of gas.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A rotary ventilation valve, characterized in that: include: A valve cylinder assembly (100), wherein a valve chamber (110) is provided in the valve cylinder assembly (100); A valve core (200), the valve core (200) being disposed in the valve cavity (110), the valve core (200) being movable up and down relative to the valve cavity (110), and the valve core (200) and the valve cylinder assembly (100) being circumferentially fixed; a valve seat (300), wherein the valve seat (300) is disposed in the valve cavity (110), and the valve seat (300) is rotatable relative to the valve cavity (110), A first gas flow path for high-pressure gas flow and a second gas flow path for low-pressure gas flow are formed between the valve cylinder assembly (100), the valve core (200) and the valve seat (300); a driving motor (400), the driving motor (400) being drivingly connected to the valve seat (300) to drive the valve seat (300) to rotate relative to the valve chamber (110) to switch between the first air flow path and the second air flow path; An elastic pre-tightening structure (500) is provided between the valve core (200) and the valve cylinder assembly (100), and the elastic pre-tightening structure (500) acts on the valve core (200) to maintain the valve core (200) and the valve seat (300) in an elastic pre-tightening and fitting state.

2. The rotary air exchange valve according to claim 1, characterized in that: The elastic preload structure (500) comprises a spring member (510), and the spring member (510) is located between an end surface of the valve core (200) away from the valve seat (300) and the valve cylinder assembly (100).

3. The rotary air exchange valve according to claim 2, characterized in that: The valve cylinder assembly (100) is provided with a first groove (120), and an end surface of the valve core (200) away from the valve seat (300) is provided with a second groove (210); The elastic preload structure (500) further comprises a first plate body (520) and a second plate body (530), wherein the first plate body (520) is fixedly connected to one end of the spring member (510), and the second plate body (530) is fixedly connected to the other end of the spring member (510), the first plate body (520) is adapted to and plug-fit into the first groove (120), and the second plate body (530) is adapted to and plug-fit into the second groove (210).

4. The rotary air exchange valve according to claim 1, characterized in that: The driving motor (400) is located outside the valve chamber (110) of the valve cylinder assembly (100).

5. The rotary air exchange valve according to claim 4, characterized in that: A pin shaft (420) is provided on the output rotating shaft (410) of the driving motor (400); the center line of the output rotating shaft (410) of the driving motor (400) and the center line of the pin shaft (420) are perpendicular to each other; and the length of the pin shaft (420) in the axial direction is greater than the diameter of the output rotating shaft (410) of the driving motor (400); The valve seat (300) is provided with a transmission groove (310), and the transmission groove (310) is located on an end surface of the valve seat (300) facing the drive motor (400). The transmission groove (310) cooperates with the output shaft (410) of the drive motor (400) and the pin shaft (420) to form a compatible structure.

6. The rotary air exchange valve according to claim 1, characterized in that: The valve cylinder assembly (100) is provided with a high-pressure air inlet hole (130), a low-pressure air return hole (140) and a vent hole (150); The valve core (200) is provided with an air passage (220) with one end open, the valve seat (300) is provided with a high-pressure air passage (320) and a low-pressure air passage (330), the high-pressure air passage (320) and the low-pressure air passage (330) are arranged at intervals, and the valve seat (300) rotates relative to the valve core (200) so that the valve seat (300) has a first working angle for high-pressure operation and a second working angle for low-pressure operation; When the valve seat (300) is located at the first working angle, the high-pressure air inlet hole (130), the high-pressure air flow channel (320), the air passage (220) and the air vent (150) are connected to form the first air flow path; when the valve seat (300) is located at the second working angle, the air vent (150), the air passage (220), the low-pressure air flow channel (330) and the low-pressure air return hole (140) are connected to form the second air flow path.

7. The rotary air exchange valve according to claim 6, characterized in that: The high-pressure air channel (320) includes a first high-pressure air channel (321) and a second high-pressure air channel (322) communicating with the first high-pressure air channel (321); the low-pressure air channel (330) includes a first low-pressure air channel (331) and a second low-pressure air channel (332) communicating with the first low-pressure air channel (331); The first high-pressure air duct (321) and the first low-pressure air duct (331) are both vertically arranged on the valve seat (300), the second high-pressure air duct (322) and the second low-pressure air duct (332) are both horizontally arranged on the valve seat (300), and the centerline angle between the second high-pressure air duct (322) and the second low-pressure air duct (332) is 180 degrees.

8. The rotary air exchange valve according to claim 7, characterized in that: A first sealing ring (610), a second sealing ring (620), a third sealing ring (630) and a fourth sealing ring (640) are provided between the valve seat (300) and the valve cylinder assembly (100); the first sealing ring (610), the second sealing ring (620), the third sealing ring (630) and the fourth sealing ring (640) are sheathed on the outer wall of the valve seat (300); The first sealing ring (610) and the second sealing ring (620) are respectively located on two opposite sides of the second high-pressure air passage (322), and the third sealing ring (630) and the fourth sealing ring (640) are respectively located on two opposite sides of the second low-pressure air passage (332).

9. The rotary air exchange valve according to claim 1, characterized in that: One of the inner wall of the valve cavity (110) of the valve cylinder assembly (100) and the valve core (200) is provided with a square convex frame (160), and the other of the inner wall of the valve cavity (110) of the valve cylinder assembly (100) and the valve core (200) is provided with a square clamping groove (230), and the square convex frame (160) and the square clamping groove (230) are clamped and can be moved up and down to match; The square convex frame (160) and the square clamping groove (230) are arranged in cooperation with each other around the elastic pre-tightening structure (500).

10. A refrigeration device, characterized in that: include: The rotary ventilation valve according to any one of claims 1 to 9; A compressor (800), the compressor (800) being provided with a high-pressure gas outlet and a low-pressure gas return, the high-pressure gas outlet being in communication with the first gas flow path, and the low-pressure gas return being in communication with the second gas flow path; A refrigerator (900), wherein a gas delivery end of the refrigerator (900) is in communication with the valve chamber (110) of the valve cylinder assembly (100).

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