Rotor split type Stirling refrigerator

Abstract

The rotor split type Stirling cryocooler comprises a compression rotor machine and an expansion rotor machine, the expansion rotor machine is located at the cold end, and the compression rotor machine is located at the hot end; the compression rotor machine is internally provided with a hot cavity with the volume changing periodically. The expansion rotor machine is internally provided with a cold chamber of which the volume is periodically changed; the difference between the phase angle of a rotor in the expansion rotor machine and the phase angle of a rotor in the compression rotor machine is 90 degrees; a hot cavity with the volume gradually reduced in the compression rotor machine is communicated with a cold cavity with the volume gradually increased in the expansion rotor machine through heat exchange equipment; the hot cavity with the gradually-increased volume in the compression rotor machine communicates with the cold cavity with the gradually-decreased volume in the expansion rotor machine through the heat exchange equipment, and when the hot cavity with the gradually-increased volume is in an expansion starting state, the cold cavity with the gradually-decreased volume communicated with the hot cavity is in a compression starting state. The cooling capacity loss caused by heat conduction of the cylinder body can be avoided.

Description

Technical Field

[0001] The invention relates to the field of refrigeration, and in particular to a rotor-split Stirling refrigerator. Background Art

[0002] Stirling refrigerator is a refrigeration device that works on the principle of reverse Stirling cycle. It is widely used in cryogenic technology and some high-precision refrigeration fields because it can efficiently cool in relatively low temperature environment and has advantages such as wide operating temperature range, fast startup and high efficiency.

[0003] According to the positional relationship between the compression chamber and the expansion chamber, Stirling refrigerators can be divided into two types: integral type and split type.

[0004] The compression chamber and expansion chamber of the integral Stirling refrigerator are assembled in the same housing and driven by a crank-connecting rod structure. This mechanical structure ensures the phase difference of the volume change in the chamber. However, the crank-connecting rod structure causes the device to vibrate more;

[0005] The compression chamber and expansion chamber of a split Stirling refrigerator are generally connected by a metal hose, and a gas spring resonance system is used to ensure the phase difference between the two during operation. Its vibration is small, so it is mostly used in low-vibration situations.

[0006] At present, most of the more mature Stirling refrigerators are piston or two-stage piston refrigerators, which achieve volume changes in the body through the reciprocating motion of the piston, which leads to relatively serious vibration and noise problems. However, as the application of Stirling refrigerators becomes more and more extensive, the requirements for refrigerators are becoming more and more stringent. Therefore, it is necessary to design a Stirling refrigerator that can solve the vibration and noise problems and improve the refrigeration efficiency. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a rotor split Stirling engine, in which the rotor machine rotates, avoiding the reciprocating motion of the traditional piston refrigerator, and can alleviate the vibration and noise problem to a certain extent. The proposed rotor split Stirling engine arranges the two rotor machines separately, which is equivalent to separating the cold end from the hot end, so as to avoid the loss of cooling capacity caused by heat conduction of the cylinder.

[0008] The present invention achieves the above technical objectives through the following technical means.

[0009] A rotor-split Stirling refrigerator, comprising a compression rotor machine and an expansion rotor machine, wherein the expansion rotor machine is located at the cold end and the compression rotor machine is located at the hot end; the compression rotor machine has a hot chamber with periodic volume changes; the expansion rotor machine has a cold chamber with periodic volume changes; the phase angle of the rotor in the expansion rotor machine differs by 90° from the phase angle of the rotor in the compression rotor machine; the hot chamber with gradually decreasing volume in the compression rotor machine is connected to the cold chamber with gradually increasing volume in the expansion rotor machine through a heat exchange device; the hot chamber with gradually increasing volume in the compression rotor machine is connected to the cold chamber with gradually decreasing volume in the expansion rotor machine through a heat exchange device, and when the hot chamber with gradually increasing volume is in the beginning expansion state, the cold chamber with gradually decreasing volume connected thereto is in the beginning compression state. The present invention uses a rotor machine as a compressor and an expander of a refrigerator, and the triangular rotor divides the cylinder into three independent chambers, and the gas in each chamber is periodically compressed and expanded. It is only necessary to set the phase of the expander to lag behind the compressor by 90° during operation, and then connect the three chambers accordingly, so that each pair of connected chambers is performing a Stirling reverse cycle, and the system composed of two rotor machines is performing three Stirling reverse cycles at the same time. However, since the position of each chamber of the triangular rotor machine is constantly changing, in order to ensure that the two chambers are always connected without affecting the sealing performance of the rotor machine, this patent also rotates the valve assembly and alternately opens the three channels to achieve that the chambers can be connected as needed.

[0010] Furthermore, the heat exchange equipment includes a rotary valve assembly, a heat accumulator and a metal heat exchange tube; the two ends of the heat accumulator are connected to the metal heat exchange tube, each metal heat exchange tube is connected to the outlet of the rotary valve assembly, one rotary valve assembly inlet is connected to the hot chamber, and the other rotary valve assembly inlet is connected to the cold chamber; the rotary valve assembly switches the chamber connected to the metal heat exchange tube by rotating the valve core.

[0011] Furthermore, the rotary valve assembly includes a shell, a valve core and a valve shaft. One end of the shell is provided with an inlet connected to the hot chamber / cold chamber, and the other end of the shell is provided with an outlet connected to the metal heat exchange tube. A valve core is provided in the shell, and the valve shaft is transmission-connected to the valve core. The rotation of the valve core is used to switch different hot chambers / cold chambers to be connected to the metal heat exchange tube.

[0012] Furthermore, the rotary valve assembly connected to the hot chamber rotates synchronously with the compressor triangular rotor of the compression rotor machine through a synchronization mechanism; the rotary valve assembly connected to the cold chamber rotates synchronously with the expander triangular rotor of the expansion rotor machine through a synchronization mechanism.

[0013] Furthermore, the synchronization mechanism includes a large gear and a small gear, the large gear is connected to the compressor rotor shaft or the expander rotor shaft, the small gear is connected to the valve core of the rotary valve assembly, and the large gear is meshed with the small gear.

[0014] Furthermore, the gear ratio between the large gear and the small gear is 3:1.

[0015] The beneficial effects of the present invention are:

[0016] 1. The split-rotor Stirling refrigerator of the present invention places the expansion rotor at the cold end and the compression rotor at the hot end, so that the compressor and the expansion machine are distributed separately, which is equivalent to separating the cold end from the hot end, thereby avoiding the loss of cooling capacity caused by heat conduction of the cylinder.

[0017] 2. The split-rotor Stirling refrigerator of the present invention utilizes the rotation of a triangular rotor to achieve compression and expansion of the working fluid. The simple friction between the triangular rotor and the cylinder wall is relatively small. The piston is used for reciprocating motion. There is a coaxiality difference between the piston and the cylinder wall, which will cause lateral friction between the piston and the cylinder wall, thereby reducing vibration.

[0018] 3. The rotor-split Stirling refrigerator of the present invention adopts two rotors to be distributed separately, one as the hot end and the other as the cold end, so that the hot and cold cavities are separated, and the temperature difference between different cavities in the same rotor is extremely small, avoiding the heat conduction of the cavity wall and affecting the circulation. At the same time, the rotors are distributed separately, and the material of the cavity is not limited by the heat conduction between the cavities. Therefore, the device can be processed with materials with higher thermal conductivity, so that the entire rotor participates in the heat exchange process of the cycle, thereby reducing the size of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a three-dimensional diagram of the split-rotor Stirling refrigerator described in the present invention.

[0021] Figure 2 It is an overall schematic diagram of the compression rotor machine described in the present invention.

[0022] Figure 3 It is an overall schematic diagram of the expansion rotor machine described in the present invention.

[0023] Figure 4 This is a schematic diagram of the installation of the rotary valve assembly described in the present invention.

[0024] Figure 5 This is a schematic diagram of the split-rotor Stirling refrigerator described in the present invention.

[0025] Figure 6 It is a schematic diagram of the explosion of the rotary valve assembly described in the present invention.

[0026] Figure 7 This is a schematic diagram of the chamber distribution described in the present invention.

[0027] Figure 8 This is a schematic diagram of the top dead center position of the triangular rotor described in the present invention.

[0028] Fig. 9 This is a schematic diagram of the triangular rotor of the compressor of the present invention being located at the top dead center.

[0029] Fig.10 This is a schematic diagram of the triangular rotor of the compressor of the present invention being located 90° before the top dead center.

[0030] Fig.11 This is a schematic diagram of the triangular rotor of the compressor of the present invention being located 120° before the top dead center.

[0031] Fig.12 This is a schematic diagram of the triangular rotor of the compressor of the present invention being located 210° before the top dead center.

[0032] Fig.13 This is a schematic diagram of the triangular rotor of the compressor of the present invention being located 240° before the top dead center.

[0033] Fig.14 This is a schematic diagram of the triangular rotor of the compressor of the present invention being located 330° before the top dead center.

[0034] In the figure:

[0035] 1-compression rotor machine; 2-expansion rotor machine; 3-rotary valve assembly; 4-heat accumulator; 5-metal heat exchange tube; 6-compressor cylinder wall; 7-compressor triangular rotor; 8-compressor rotor shaft; 9-compressor first air hole; 10-compressor second air hole; 11-compressor third air hole; 12-large gear; 13-adapter; 14-expander cylinder wall; 15-expander triangular rotor; 16-expander rotor shaft; 17-expander air hole; 18-first valve; 19-second valve; 20-third valve; 21-fourth valve; 22-fifth valve; 23-sixth valve; 24-first interface; 25-second interface; 26-third interface; 27-fixed three-port disc; 28-valve core; 29-fixed single-port disc; 30-valve shaft; 31-small gear; 32-first chamber; 33-second chamber; 34-third chamber. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1As shown, the rotor-split Stirling refrigerator of the present invention comprises a compression rotor machine 1 and an expansion rotor machine 2, wherein the expansion rotor machine 2 is located at the cold end and the compression rotor machine 1 is located at the hot end; the compression rotor machine 1 has a hot chamber with a periodic volume change; the expansion rotor machine 2 has a cold chamber with a periodic volume change; the phase angle of the rotor in the expansion rotor machine 2 differs by 90° from the phase angle of the rotor in the compression rotor machine 1; the hot chamber with a gradually decreasing volume in the compression rotor machine 1 is connected with the cold chamber with a gradually increasing volume in the expansion rotor machine 2 through a heat exchange device; the hot chamber with a gradually increasing volume in the compression rotor machine 1 is connected with the cold chamber with a gradually decreasing volume in the expansion rotor machine 2 through a heat exchange device, and when the hot chamber with a gradually increasing volume is in a starting expansion state, the cold chamber with a gradually decreasing volume connected thereto is in a starting compression state. The compression rotor machine 1 and the expansion rotor machine 2 are distributed separately, which is equivalent to separating the cold end from the hot end. This can avoid the loss of cooling capacity caused by heat conduction of the cylinder. At the same time, the temperature difference between different cavities in the same rotor machine is extremely small, avoiding heat conduction of the cavity wall and affecting the circulation.

[0040] like Figure 2 As shown, the compressor rotor machine 1 includes a compressor cylinder wall 6, a compressor triangular rotor 7, a compressor rotor shaft 8 and a large gear 12; the compressor cylinder wall 6 is provided with a compressor triangular rotor 7, and the compressor rotor shaft 8 is used to drive the compressor triangular rotor 7 to rotate. Through the rotation of the compressor triangular rotor 7, the compressor cylinder wall 6 has three chambers with periodic volume changes. For the convenience of explanation, the chamber in the compressor cylinder wall 6 is defined as a thermal chamber, but it cannot be narrowly understood as a chamber with hot temperature. One end of the compressor rotor shaft 8 is connected to the large gear 10, and the large gear 12 is driven to rotate while the compressor triangular rotor 7 rotates. The compressor cylinder wall 6 is provided with three compressor air holes, namely the first compressor air hole 9, the second compressor air hole 10 and the third compressor air hole 11; the three compressor air holes correspond to the three thermal chambers. It can be considered that in the three thermal chambers with periodic volume changes, in any state, at least one compressor air hole is connected to a thermal chamber. When the rotor is at the top dead center or the bottom dead center, there are two compressor air holes and one thermal chamber, such as Figure 8 As shown, Figure 8 When the rotor is at the top dead center, one of the compressor holes is connected to two heat chambers at the same time, that is, two compressor holes are connected to one heat chamber, but this state is very short, so in the principle introduction, it is considered that one compressor hole is connected to one heat chamber. Figure 7 As shown, it can be Figure 7 If the shell is regarded as the compressor cylinder wall 6, then the first chamber 32, the second chamber 33 and the third chamber 34 inside it can be understood as the first hot chamber, the second hot chamber and the third hot chamber.

[0041] The expansion rotor machine 2 has the same structure as the compression rotor machine 1, except that the expansion rotor lags behind the compressor by 90°. Figure 3 As shown, the expander rotor machine 2 includes an expander cylinder wall 14, an expander triangular rotor 15, an expander rotor shaft 16, an expander air hole 17 and a large gear 12; the expander cylinder wall 14 is provided with an expander triangular rotor 15, and the expander rotor shaft 16 is used to drive the expander triangular rotor 15 to rotate. Through the rotation of the expander triangular rotor 15, the expander cylinder wall 14 has three chambers with periodic volume changes. For the convenience of explanation, the chamber in the expander cylinder wall 14 is defined as a cold chamber, but it cannot be narrowly understood as a chamber with a cold temperature. One end of the expander triangular rotor 15 is connected to the large gear 12, and the large gear 12 is driven to rotate while the expander triangular rotor 15 rotates. The expander cylinder wall 14 is provided with three expander air holes 17; the three expander air holes 17 correspond to the three cold chambers. It can be considered that in the three cold chambers with periodic volume changes, in any state, at least one expander air hole 17 is connected to a cold chamber. As shown Figure 7 As shown, it can be Figure 7 If the shell is regarded as the expansion machine cylinder wall 14, then the first chamber 32, the second chamber 33 and the third chamber 34 inside it can be understood as the first cold chamber, the second cold chamber and the third cold chamber.

[0042] like Figure 1 and Figure 5 As shown, the heat exchange equipment includes a rotary valve assembly 3, a heat accumulator 4 and a metal heat exchange tube 5; the two ends of the heat accumulator 4 are connected to the metal heat exchange tube 5, each metal heat exchange tube 5 is connected to the outlet of the rotary valve assembly 3, the inlet of one rotary valve assembly 3 is connected to the hot chamber, and the inlet of the other rotary valve assembly 3 is connected to the cold chamber; the rotary valve assembly 3 switches the chamber connected to the metal heat exchange tube 5 by rotating the valve core.

[0043] In the embodiment, three groups of heat exchange equipment are required, namely, six rotary valve assemblies 3, three heat accumulators 4 and six metal heat exchange tubes 5; three compressor air holes and three expander air holes 17 are respectively connected to the adapter 13, and the adapter 13 is a one-inlet and three-outlet joint. Taking the compression rotor machine 1 as an example, the three branches branched from the first air hole 9 of the compressor through the adapter 13 are respectively connected to the first inlets of the three rotary valve assemblies 3, the three branches branched from the second air hole 10 of the compressor through the adapter 13 are respectively connected to the second inlets of the three rotary valve assemblies 3, and the three branches branched from the third air hole 11 of the compressor are respectively connected to the third inlets of the three rotary valve assemblies 3 through the adapter 13. The outlet of each rotary valve assembly 3 is connected to one end of the heat accumulator 4 through the metal heat exchange tube 5; the connection method between the expander air hole 17 and the rotary valve assembly 3 is the same as the connection method between the compressor air hole and the rotary valve assembly 3, so it will not be repeated.

[0044] like Figure 4 and Figure 6 As shown, the rotary valve assembly 3 includes a housing, a valve core 28 and a valve shaft 30. One end of the housing is provided with an inlet connected to the hot chamber / cold chamber, and the other end of the housing is provided with an outlet connected to the metal heat exchange tube 5. A valve core 28 is provided in the housing, and the valve shaft 30 is connected to the valve core 28 in a transmission manner. Through the rotation of the valve core 28, it is used to switch different hot chambers / cold chambers to communicate with the metal heat exchange tube 5. The housing includes a fixed three-port disc 27 and a fixed single-port disc 29; the first interface 24, the second interface 25 and the third interface 26 on the fixed three-port disc are respectively connected to an air hole on the cylinder wall. The rotary valve assembly 3 connected to the hot chamber rotates synchronously with the compressor triangular rotor 7 of the compression rotor machine 1 through a synchronization mechanism; the rotary valve assembly 3 connected to the cold chamber rotates synchronously with the expander triangular rotor 15 of the expansion rotor machine 2 through a synchronization mechanism. The synchronization mechanism includes a large gear 12 and a small gear 31, wherein the large gear 12 is connected to the compressor rotor shaft 8 or the expander rotor shaft 16, and the small gear 31 is connected to the valve core of the rotary valve assembly 3, and the large gear 12 is meshed with the small gear 31. The gear ratio of the large gear 12 to the small gear 31 is 3:1. When the rotor shaft rotates one circle, the valve shaft 30 rotates 1 / 3 circle. Since the gear ratio of the rotor shaft and the gear between the rotors is 1:3, when the rotor shaft rotates one circle, the rotor rotates 1 / 3 circle. Therefore, the rotating disks of the rotor and the valve have the same rotation speed. When the rotor rotates 1 / 3 circle, the valve also rotates 1 / 3 circle, thereby realizing the valve switching of different hot chambers / cold chambers to communicate with the metal heat exchange tube 5.

[0045] like Figure 5This is a schematic diagram of the split-rotor Stirling refrigerator of the present invention. For the convenience of explanation, the three hot chambers are respectively recorded as hot chamber A, hot chamber B and hot chamber C, and the three cold chambers are respectively recorded as cold chamber D, cold chamber E and cold chamber F. Since the state of the rotor being at the top dead center is very short, it is assumed in the principle introduction that one compressor pore / expander pore is connected to only one chamber. The hot chamber A is communicated with the first inlets of the first valve 18, the second valve 19 and the third valve 20 respectively through the first air hole 9 of the compressor, the hot chamber B is communicated with the second inlets of the first valve 18, the second valve 19 and the third valve 20 through the second air hole 10 of the compressor, the hot chamber C is communicated with the third inlets of the first valve 18, the second valve 19 and the third valve 20 through the third air hole 11 of the compressor, the first valve 18 is communicated with the fourth valve 21 through the metal heat exchange tube 5, the second valve 19 is communicated with the fifth valve 22 through the metal heat exchange tube 5, and the third valve 20 is communicated with the sixth valve 23 through the metal heat exchange tube 5; similarly, the cold chamber D is communicated with the first inlet of the fourth valve 21, the fifth valve 22 and the sixth valve 23, the cold chamber E is communicated with the second inlet of the fourth valve 21, the fifth valve 22 and the sixth valve 23, and the cold chamber F is communicated with the third inlet of the fourth valve 21, the fifth valve 22 and the sixth valve 23.

[0046] Figure 5 The rotor in the compressor is about to rotate counterclockwise past the top dead center. At this time, the volume of the hot chamber A gradually decreases, and the volume of the cold chamber F in the expander gradually increases, and the hot chamber A is connected with the cold chamber F through a heat exchange device; the volume of the hot chamber B gradually increases, and the volume of the cold chamber D in the expander gradually decreases, and the hot chamber B is connected with the cold chamber D through a heat exchange device; the volume of the hot chamber C gradually increases, and the volume of the cold chamber E in the expander gradually decreases, and the hot chamber C is connected with the cold chamber E through a heat exchange device; it can be seen from the figure that when the hot chamber C is in the initial expansion state, it is in the initial compression state with the cold chamber E.

[0047] The following takes the cycle of hot chamber A and cold chamber F as an example to illustrate:

[0048] Fig. 9The triangular rotor 7 of the compressor is initially located at the top dead center position, and the compressor rotor shaft 8 drives the triangular rotor 7 of the compressor to rotate counterclockwise. At this time, the hot chamber A of the compressor is connected to the first inlet of the first valve 18, the second valve 19 and the third valve 20 through the first air hole 9 of the compressor. At this time, the position of the valve core rotation of the first valve 18 makes the first inlet of the first valve 18 and its outlet connected. When the hot chamber A is at the top dead center position, the internal working fluid begins to be compressed. Due to the heat dissipation of the cylinder wall, the working fluid temperature cannot be increased synchronously, and an isothermal compression process is performed to release heat. Subsequently, the working fluid enters the heat accumulator 4 through the metal heat exchange tube 5, and the working fluid absorbs heat and performs an isochoric heat release process; at this time, the position of the valve core rotation of the fourth valve 21 makes the third inlet of the fourth valve 21 connected to the outlet, and the working fluid enters the cold chamber F through the third inlet of the fourth valve 21. The working fluid expands, the temperature and pressure are reduced, and the surrounding heat is absorbed, so that its own temperature remains unchanged, and an isothermal expansion process is performed.

[0049] like Fig.10 and Fig.11 As shown in the figure, the triangular rotor 7 of the compressor is located at 90° before the top dead center and rotates counterclockwise to 120° before the top dead center. At this time, the volume of the hot chamber A of the compressor gradually increases during the counterclockwise rotation of the triangular rotor 7 of the compressor, and the volume of the corresponding cold chamber F gradually decreases. At this time, the cold chamber F of the expander is connected to the first inlet of the fourth valve 21, the fifth valve 22 and the sixth valve 23. At this time, the rotation position of the valve core of the fourth valve 21 makes the first inlet of the fourth valve 21 and its outlet connected. At this time, when the cold chamber F of the expander starts to compress, the working fluid is pushed through the heat accumulator 4 to absorb heat and return to the hot chamber A of the compressor.

[0050] like Fig.12 and Fig.13 As shown in the figure, when the triangular rotor 7 of the compressor is located at 210° before the top dead center and rotates counterclockwise to 240° before the top dead center, the volume of the compressor hot chamber A gradually decreases, while the volume of the corresponding cold chamber F gradually increases. The compressor hot chamber A is connected with the second inlet of the first valve 18, the second valve 19 and the third valve 20 through the second air hole 10 of the compressor. At this time, the rotation position of the valve core of the first valve 18 makes the second inlet of the first valve 18 connected with its outlet, and the working medium in the compressor hot chamber A is pushed through the heat accumulator 4 to absorb heat and return to the cold chamber F of the expander.

[0051] like Fig.13 and Fig.14As shown in the figure, when the triangular rotor 7 of the compressor is located at 240° before the top dead center and rotates counterclockwise to 330° before the top dead center, the volume of the hot chamber A of the compressor gradually increases, and the volume of the corresponding cold chamber F gradually decreases. At this time, the cold chamber F of the expander is connected with the second inlet of the fourth valve 21, the fifth valve 22 and the sixth valve 23. At this time, the position of the valve core rotation of the fourth valve 21 makes the second inlet of the fourth valve 21 connected with its outlet. At this time, when the cold chamber F of the expander starts to compress, the working fluid is pushed through the heat accumulator 4 to absorb heat and return to the hot chamber A of the compressor.

[0052] like Fig.14 and Fig. 9 As shown in the figure, the triangular rotor 7 of the compressor continues to rotate counterclockwise from 330° before the top dead center to the top dead center position. During this process, the volume of the hot chamber A of the compressor gradually decreases, while the volume of the corresponding cold chamber F gradually increases. The hot chamber A of the compressor is connected to the first inlet of the first valve 18, the second valve 19 and the third valve 20 through the first air hole 9 of the compressor. At this time, the rotation position of the valve core of the first valve 18 makes the first inlet of the first valve 18 connected to its outlet, and the working medium in the hot chamber A of the compressor is pushed through the heat accumulator 4 to absorb heat and enter the cold chamber F of the expander.

[0053] It can be seen from the flow chart that when the hot chamber A starts to compress, the working fluid is compressed. Due to the heat dissipation of the cylinder wall, the working fluid temperature cannot be increased synchronously, and an isothermal compression process is performed to release heat. Then the working fluid enters the heat accumulator 4 through the metal heat exchange tube 5, and the working fluid absorbs heat and performs an isochoric heat release process. Then the working fluid enters the cold chamber F, the working fluid expands, the temperature and pressure are reduced, and the surrounding environment heat is absorbed, so that its own temperature remains unchanged, and an isothermal expansion process is performed. When the cold chamber F starts to compress, the working fluid is pushed through the heat accumulator 4 to absorb heat and return to the hot chamber A. At this point, a Stirling reverse cycle is completed. In this cycle, the working fluid continuously absorbs heat in the expander chamber, while the compressor chamber continuously absorbs gas heat, and the temperature of the cold end chamber continues to decrease, achieving a refrigeration effect. The three chambers of the compressor correspond one-to-one to the three chambers of the expander, and three Stirling reverse cycles are performed at the same time. The Stirling refrigerator takes advantage of the small size and high power density of the rotor machine, and separates the cold end from the hot end, greatly improving the refrigeration efficiency.

[0054] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0055] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotor split Stirling refrigerator, characterized in that: The invention comprises a compression rotor machine (1) and an expansion rotor machine (2), wherein the expansion rotor machine (2) is located at the cold end and the compression rotor machine (1) is located at the hot end; the compression rotor machine (1) has a hot chamber with a periodic volume change; the expansion rotor machine (2) has a cold chamber with a periodic volume change; the phase angle of the rotor in the expansion rotor machine (2) differs from the phase angle of the rotor in the compression rotor machine (1) by 90°; The hot chamber with a gradually decreasing volume in the compression rotor machine (1) is connected to the cold chamber with a gradually increasing volume in the expansion rotor machine (2) via a heat exchange device; the hot chamber with a gradually increasing volume in the compression rotor machine (1) is connected to the cold chamber with a gradually decreasing volume in the expansion rotor machine (2) via a heat exchange device, and when the hot chamber with a gradually increasing volume is in a state of starting to expand, the cold chamber with a gradually decreasing volume connected to it is in a state of starting to compress.

2. The split-rotor Stirling refrigerator according to claim 1, characterized in that: The heat exchange device comprises a rotary valve assembly (3), a heat accumulator (4) and a metal heat exchange tube (5); both ends of the heat accumulator (4) are connected to the metal heat exchange tube (5), each metal heat exchange tube (5) is connected to the outlet of the rotary valve assembly (3), the inlet of one rotary valve assembly (3) is connected to the hot chamber, and the inlet of the other rotary valve assembly (3) is connected to the cold chamber; the rotary valve assembly (3) switches the chamber connected to the metal heat exchange tube (5) by rotating the valve core.

3. The split-rotor Stirling refrigerator according to claim 2, characterized in that: The rotary valve assembly (3) comprises a housing, a valve core (28) and a valve shaft (30); one end of the housing is provided with an inlet connected to a hot chamber / cold chamber, and the other end of the housing is provided with an outlet connected to a metal heat exchange tube (5); a valve core (28) is provided in the housing, and the valve shaft (30) is transmission-connected to the valve core (28); the valve core (28) is rotated to switch between different hot chambers / cold chambers and the metal heat exchange tube (5).

4. The split-rotor Stirling refrigerator according to claim 2, characterized in that: The rotary valve assembly (3) communicated with the hot chamber rotates synchronously with the compressor triangular rotor (7) of the compression rotor machine (1) through a synchronization mechanism; the rotary valve assembly (3) communicated with the cold chamber rotates synchronously with the expander triangular rotor (15) of the expansion rotor machine (2) through a synchronization mechanism.

5. The split-rotor Stirling refrigerator according to claim 4, characterized in that: The synchronization mechanism comprises a large gear (12) and a small gear (31), wherein the large gear (12) is connected to a compressor rotor shaft (8) or an expander rotor shaft (16), and the small gear (31) is connected to a valve core of a rotary valve assembly (3), and the large gear (12) meshes with the small gear (31).

6. The split-rotor Stirling refrigerator according to claim 5, characterized in that: The gear ratio between the large gear (12) and the small gear (31) is 3:1.

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