Enhanced vapor injection compressor and determination method of injection orifice

Abstract

The invention discloses a determination method for an injection orifice of an enhanced vapor injection compressor, the opening angle theta open and the closing angle theta close of the injection orifice in an enhanced vapor injection loop in the compressor are determined, accurate determination of the position of the injection orifice is realized by combining a three-circle positioning geometric mapping method, and the injection orifice can be accurately determined through geometric constraints of a base circle, an auxiliary circle and a rotor inner circle trajectory circle. The settable area of the jet orifice on the partition plate is precisely defined, the maximum allowable outline of the jet orifice is determined through the inscribed circle, it is ensured that the jet orifice can be reliably opened and sealed within the calculated ideal angle range in the rotor movement process, gas backflow and mechanical interference are prevented, the timing precision of enhanced vapor injection and the control accuracy of the gas injection amount are improved, and the service life of the jet orifice is prolonged. The adaptability and the operation stability of the compressor under different working conditions are improved, and the injection efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology and relates to a jet enthalpy-enhancing compressor and a method for determining the injection port. Background Technology

[0002] With the widespread application of low-temperature heat pump heating systems in cold regions, the requirements for the heating performance and energy efficiency of compressors are becoming increasingly stringent. Conventional rolling rotor compressors, when operating in low-temperature environments, often experience problems such as excessively high exhaust temperature, insufficient heating capacity, decreased volumetric efficiency, and reduced energy efficiency ratio due to increased compression ratio, increased suction specific volume, and reduced refrigerant circulation. These problems severely limit the application effect and energy utilization efficiency of heat pump systems in cold regions.

[0003] Vapor injection enthalpy enhancement technology, by injecting gas at intermediate pressure into the intermediate-pressure chamber, effectively reduces exhaust temperature, increases refrigerant flow, improves heating capacity, and enhances system energy efficiency, making it one of the key technologies for low-temperature heat pump systems. However, existing vapor injection enthalpy enhancement compressors rely heavily on experience or simplified models in their injection port design, lacking systematic calculation methods. This empirical design approach has several significant drawbacks: first, inaccurate injection timing may lead to premature or delayed gas injection, affecting the enthalpy enhancement effect; second, imprecise control of the injected gas quantity may cause pressure fluctuations or energy losses in the compression chamber; and third, it lacks adaptability to changes in system operating parameters, resulting in unstable performance under different operating conditions. These problems lead to low injection efficiency and poor system compatibility, severely restricting the full realization of the effects of vapor injection enthalpy enhancement technology. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art where the design of the injection port location in the jet enthalpy enhancement circuit relies heavily on experience or simplified models and lacks a systematic calculation method, resulting in inaccurate injection timing, imprecise control of the injected gas volume, and low injection efficiency. This invention provides a method for determining the jet enthalpy enhancement compressor and the injection port.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A method for determining the injection port of a jet enthalpy-enhancing compressor includes the following steps: Determine the opening angle θ of the nozzle in the vapor injection enthalpy enhancement circuit of the compressor. open and closing angle θ close ; Draw a base circle with the compressor cylinder center O as the center and the eccentricity e of the eccentric shaft as the radius; Starting from the baseline on the base circle, based on the opening angle θ open and closing angle θ close Rotate to obtain positioning points Q and G; Two auxiliary circles are obtained by drawing circles with positioning point Q and positioning point G as centers and the outer radius of the rotor as the radius; Connect the intersection point N of the two auxiliary circles to the center O of the cylinder to obtain the straight line L; With the intersection point M of the straight line L and the base circle as the center, draw the inner circle of the rotor with the inner radius of the rotor as the radius; The common area where the base circle, two auxiliary circles, and the inner circle of the rotor intersect is selected as the opening area of ​​the injection port. The largest inscribed circle is drawn within the opening area, and the inscribed circle is determined as the opening position of the injection port.

[0006] A further improvement of the present invention is that: The opening angle θ of the nozzle in the vapor injection enthalpy enhancement circuit of the compressor is determined. open and closing angle θclose, including: Set opening angle θ open The selection range is from 10° before the compressor inlet is closed to when it is completely closed; The closing angle θ close The determination includes: Set initial parameters and determine the initial gas pressure at the compressor injection port, using the crankshaft angle as the variable and θ as the variable. open To begin, rotation starts. During rotation, the pressure in the compression chamber is calculated in real time. When the pressure in the compression chamber exceeds the initial gas pressure at the injection nozzle, the current angle becomes the nozzle closing angle θ. close .

[0007] It also includes setting the closing angle θ close Defined verification conditions: When the pressure in the compression chamber is greater than the initial gas pressure at the injection port, calculate the cumulative gas mass m injected at the current injection port. inj-total If the cumulative injected gas mass m inj-total Less than the initial injected gas mass m inj-req Then adjust the injection nozzle parameters and recalculate iteratively until the cumulative injected gas mass m inj-total Greater than or equal to the initial injected gas mass m inj-req At that time, the current angle is the closed angle θ. close .

[0008] A jet enthalpy-enhancing compressor, wherein a jet enthalpy-enhancing circuit is provided inside the compressor, and the position of the injection port in the jet enthalpy-enhancing circuit is determined according to the method described in claim 1.

[0009] The device includes a cylindrical assembly, inside which a mechanism assembly is installed, the mechanism assembly is connected to a motor, an upper outer cover assembly is installed at the upper end of the cylindrical assembly, and a main circuit liquid reservoir and a jet liquid reservoir are installed on the outside of the cylindrical assembly. Both the main circuit liquid reservoir and the jet liquid reservoir are connected to the interior of the mechanism assembly. The jet augmenting circuit is arranged in the core assembly.

[0010] The core assembly comprises a crankshaft, and the crankshaft is sequentially provided with an upper cover, an upper muffler, an upper rotor, a partition plate, a lower rotor and a lower muffler from top to bottom. An upper cylinder is sleeved outside the upper rotor, and a lower cylinder is sleeved outside the lower rotor. The jet augmenting circuit is arranged on the partition plate, and the jet augmenting circuit is connected with a compression cavity of the upper cylinder and a compression cavity of the lower cylinder respectively.

[0011] The jet augmenting circuit comprises a flow-through channel, one end of the flow-through channel is connected with a jet reservoir, the other end of the flow-through channel is connected with an injection channel, one end of the injection channel is connected with the compression cavity of the upper cylinder, the other end of the injection channel is connected with the compression cavity of the lower cylinder, and a port of the injection channel is a jet port.

[0012] An air inlet hole is arranged in the upper cylinder, the air inlet hole is connected with a cavity, the cavity is arranged along an axial direction of the upper cylinder, the cavity is arranged on one side of a cavity body of the upper cylinder, the cavity is connected with the cavity body of the upper cylinder, both ends of the cavity are flush with both ends of the cavity body of the upper cylinder, and both ends of the cavity are through. A type groove is arranged in the lower cylinder, the type groove is arranged along an axial direction of the lower cylinder, the type groove is a sunken groove, the type groove is arranged on one side of a cavity body of the lower cylinder, and the type groove is connected with the cavity body of the lower cylinder. The through hole is connected with the cavity at an upper end and is connected with the type groove at a lower end.

[0013] A jet circuit injection needle is arranged at an outlet of the jet reservoir, one end of the jet circuit injection needle is connected with the jet reservoir, and the other end of the jet circuit injection needle is connected with the flow-through channel.

[0014] The air conditioner comprises the jet augmenting compressor.

[0015] Compared with the prior art, the jet augmenting compressor has the following beneficial effects: The application discloses a method for determining a jet port of a jet augmenting compressor. open And a closing angle θ close The method accurately determines the position of the jet port by using a geometric drawing method of three-circle positioning, accurately defines a settable region of the jet port on the partition plate by geometric constraints of a base circle, an auxiliary circle and an inner circle track of the rotor, determines a maximum allowable contour of the jet port by using an inscribed circle, ensures that the jet port can be reliably opened and sealed within a calculated ideal angle range during movement of the rotor, prevents gas backflow and mechanical interference, improves the timing accuracy of the jet augmenting and the control accuracy of the gas injection amount, improves the adaptability and operation stability of the compressor under different working conditions, and improves the jet efficiency.

[0016] The application discloses a jet augmenting compressor, which opens a jet augmenting circuit on a partition plate, and communicates an upper cylinder compression cavity and a lower cylinder compression cavity through the jet augmenting circuit, realizes double-cylinder synchronous augmenting, ensures the balanced distribution of main circuit refrigerant between the upper and lower cylinders, and avoids the problems of volume efficiency reduction and poor system matching caused by unreasonable flow path design.

[0017] Further, the jet augmenting circuit is provided with a flow channel and an injection channel matched with each other on the partition plate, and gas is directly injected into the upper and lower cylinder compression cavities, so that the structure of one inlet and two outlets is realized, flow resistance and pressure loss are reduced, and the augmenting gas can quickly and equally act on the two compression cavities.

[0018] Further, the upper cylinder is provided with an axial through type cavity with two ends flush, and the lower cylinder is provided with a sunken type groove, the type cavity and the type groove are communicated through the through hole on the partition plate, the formed gas channel can make the refrigerant gas entering the upper cylinder directly enter the upper cylinder cavity and the lower cylinder cavity, realizes the uniform distribution of the gas circuit, realizes the efficient distribution of the main circuit gas and the precise injection of the jet circuit gas, and improves the gas flow efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0020] Figure 1 The application discloses a compressor structure schematic diagram with jet augmenting function-main circuit.

[0021] Figure 2 The application discloses a compressor structure schematic diagram with jet augmenting function-top view.

[0022] Figure 3 The application discloses a compressor structure schematic diagram with jet augmenting function-jet circuit.

[0023] Figure 4 The application discloses a compressor structure schematic diagram with jet augmenting function-main circuit.

[0024] Figure 5 The application discloses a compressor structure schematic diagram with jet augmenting function-main circuit.

[0025] Figure 6 The application discloses a compressor structure schematic diagram with jet augmenting function-main circuit.

[0026] Figure 7 The application discloses a compressor structure schematic diagram with jet augmenting function-main circuit.

[0027] Figure 8 Flow chart for calculating the position of the injection port of the present application.

[0028] Figure 9 Schematic diagram for determining the geometric position of the injection port of the present application.

[0029] Figure 10 Graph for the variation of the volume of the compression chamber with the angle of rotation of the present application.

[0030] Figure 11 Comparison graph of the pressure of the compression chamber and the injection pressure of the present application.

[0031] Figure 12 Cumulative graph of the mass of the injected gas of the present application.

[0032] 1 - cylinder assembly; 2 - core assembly; 3 - motor; 4 - cover assembly; 5 - main circuit reservoir; 6 - main circuit cylinder spool; 7 - injection circuit reservoir; 8 - injection circuit injection needle; 2-1 - upper cover; 2-2 - upper cylinder; 2-3 - partition; 2-4 - lower cylinder; 2-5 - crankshaft; 2-6 - upper rotor; 2-7 - lower rotor; 2-8 - upper muffler; 2-9 - lower muffler; 2-2-1 - intake hole; 2-2-2 - cavity; 2-2-3 - upper cylinder cavity; 2-2-6 - compressor cylinder center O; 2-2-5 - intake port; 2-3-1 - flow-through channel; 2-3-2 - injection channel; 2-3-3 - through hole; 2-3-4 - injection port; 2-4-1 - groove; 2-4-2 - lower cylinder cavity; 5-1 - intake tube; 5-2 - reservoir cylinder; 5-3 - reservoir outlet elbow; 7-1 - intake tube; 7-2 - injection circuit reservoir cylinder; 7-3 - outlet elbow. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the application without creative labor fall within the scope of the application.

[0035] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0036] In the description of the embodiments of the application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the application is usually placed, only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the embodiments of the application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0039] The application will be described in further detail below in conjunction with the accompanying drawings: Referring to Figures 1 to 12 The embodiment of the application discloses a method for determining the injection port of a jet augmenting compressor. Through the combination of innovative gas flow path structure design and accurate calculation method, the augmenting gas is injected into the compression chamber at the best opportunity and in an accurate amount, thereby significantly improving the operating efficiency, heating capacity and reliability of the compressor in a low temperature environment.

[0040] Embodiment 1 This embodiment discloses a method for determining the injection port of a jet enthalpy-enhancing compressor, including the following steps: This embodiment uses the above cylinder as an example for calculation: Step 1: Determine the opening angle θopen and closing angle θclose of the nozzle in the vapor injection enthalpy enhancement circuit of the compressor; Step 2: Based on the calculated opening angle θ_open and closing angle θ_close, and combined with the compressor geometry, determine the specific position and outline of the injection port (2-3-4) on the baffle (2-3) using the "three-circle positioning" geometric drawing method. The specific steps are as follows: Step 2.1: Draw a base circle with the cylinder center O (2-2-6) as the center and the eccentricity (e) of the eccentric shaft as the radius (re); Step 2.2: On the base circle, locate points Q and G respectively according to the opening angle θ_open and the closing angle θ_close; Step 2.3: Draw two auxiliary circles with points Q and G as centers and the outer radius (r_outer) of the rotor (2-6) as the radius; Step 2.4: Draw the intersection point N of the two auxiliary circles, and connect the intersection point N with the cylinder center O to obtain the connecting line L; Step 2.5: Connect line L to the base circle at point M. With point M as the center and the inner circle radius (r_inner) of rotor (2-6) as the radius, draw the inner circle trajectory circle of rotor. Step 2.6: A common area is defined by the base circle, the two auxiliary circles, and the inner circle trajectory circle of the rotor. This common area is the settable area of ​​the injection port (2-3-4). Step 2.7: Draw the maximum inscribed circle within the settable area to determine the maximum allowable machining profile of the injection port (2-3-4).

[0041] Furthermore, verify the nozzle position: through motion simulation or geometric analysis, verify whether the determined nozzle position meets the following requirements: Gas can be injected smoothly during the opening period (θ_open to θ_close); It can effectively seal during the closing period (after θ_close) to prevent gas backflow; It will not interfere with moving parts (such as rotors 2-6); It is easy to process and assemble.

[0042] Furthermore, in step 1, the opening angle θ of the nozzle in the vapor injection enthalpy enhancement circuit of the compressor is determined. open and closing angle θ close ,include: Step 1.1: Determining the nozzle opening angle: The injection port (2-3-4) should be opened between 10° before the compressor inlet port (2-2-5) is closed and the moment of closing.

[0043] Step 1.2: Calculation of the injection port closing angle: determined by rigorous iterative calculation, mainly based on the comparison of the gas pressure in the compression chamber and the gas pressure in the injection circuit.

[0044] First, the initial conditions are set: Set the gas pressure P in in the inlet port inj , the gas temperature T in in the inlet port, the gas temperature T inj in the injection port, the mass demand m inj-req of the injected gas, and the compressor structure parameters (such as cylinder diameter D, eccentricity e, cylinder height L, eccentricity to rotor radius ratio λ), operating frequency f, and refrigerant property parameters (such as adiabatic index k, gas constant R, flow coefficient C d ).

[0045] Second, iterative calculation of the gas state in the compression chamber: take the compressor rotation angle θ as the step (recommended every 1°), and calculate the following parameters in turn: a. Compression chamber volume V(θ): V(θ) = V min + 0.5×e×D×L×[1 - cos(θ) + (λ / 4)×(1 - cos(2θ))](1) b. Gas state parameters: Gas density: ρ = ρ(P, T) (calculated according to the refrigerant property table or state equation)(2) Specific internal energy: u = u(P, T) (calculated according to the refrigerant property table or state equation)(3) Gas mass: m gas = ρ × V(θ)(4) c. Injection gas parameters: Injection gas enthalpy: h inj = h(P inj , T inj )(5) Injection gas density: ρ inj = ρ(P inj , T inj )(6) Injection pressure difference: ΔP = P inj - P cavity (7) Critical pressure ratio judgment: P cavity / P inj≤ (2 / (k+1))^(k / (k-1)), then critical flow (8) Jet gas flow rate: v inj = C_d × √(k × R × T inj ), subcritical flow inj = C_d× √(2×|ΔP| / ρ inj )(9) d. Mass conservation calculation: Time step: Δt = 1 / (6×f)(10) Injected gas volume: ΔV inj = v inj × A inj × Δt(11) Injected gas mass: Δm inj = ρ inj × ΔV inj (12) Updated gas mass: m gas-new = m gas + Δm inj (13) e. Energy conservation calculation: m gas-new × u new = m gas × u + P × ΔV + Δm inj × h inj (14) Solve this equation to get new specific internal energy u new .

[0046] f. New state parameter calculation: New density: ρ new = m gas-new / V(θ)(15) New pressure: P new = P(ρ new , u new ) (calculated according to PR state equation)(16) New temperature: T new = T(ρ new , u new ) (calculated according to PR state equation)(17) Determine the closing condition: when the calculation finds P new > P inj , determine that the angle θ close is the theoretical angle at which the injection port is closed.

[0047] System requirement check: calculate the theoretical closing angle θclose Time cumulative injected gas mass m inj-total , if m inj-total < m inj-req , then the injection port parameters (such as advance angle, increase injection port diameter A inj , increase injection pressure P inj ) need to be adjusted and re-iterative calculation is performed until m inj-total ≥ m inj-req .

[0048] Example 2 This example discloses a method for determining the injection port of an ejector- augmented compressor, comprising the following steps: First, according to the system design requirements (such as operating at a ring temperature of -25 °C), initial parameters are determined, including the inlet pressure P in = 0.8 MPa (abs), temperature T in = -10 °C, injection port pressure P inj = 2.1 MPa (abs), temperature T inj = 25 °C, injected gas mass requirement m inj-req = 0.5 g, compressor operating frequency f = 90 Hz, refrigerant is R410A, and its physical property parameters (k, R, etc.), compressor structure parameters (D = 40 mm, e = 3 mm, L = 25 mm, λ = 0.18).

[0049] Subsequently, an iterative calculation process is started, referring to Figure 4 , with the crank angle θ as the variable (starting from θ open , step size 1°), the following calculations are performed in a loop: a. Calculate the compression chamber volume V(θ) at the current angle θ according to formula (1).

[0050] b. Calculate the current gas state (p, u, m gas ) according to formulas (2)-(4).

[0051] c. Calculate the injection gas parameters (h inj , p inj , ΔP, v inj ) according to formulas (5)-(9).

[0052] d. Perform mass conservation calculation according to formulas (10)-(13) to obtain Δm inj and m gas-new .

[0053] e. Perform energy conservation calculation according to formula (14) to solve the new specific internal energy u new .

[0054] f. Calculate new pressure P and temperature T according to formula (15)-(17) and Peng-Robinson equation of state. new and temperature T new .

[0055] g. Determine whether P new > P inj . If yes, record current angle as θ close , and jump out of loop; otherwise, increase θ by one step, and repeat steps a-f.

[0056] Calculate accumulated m close at θ inj-total , and compare with m inj-req . If m inj-total < 0.5 g, adjust parameters (e.g. advance θ open by 5°) and repeat iteration until requirements are met.

[0057] Suppose final calculation results are θ open = 160° (0° is a certain reference point), and θ close = 235°.

[0058] Next, use "three-circle positioning" geometric construction method to determine the injection port position: Establish coordinate system with cylinder center O (2-2-6) as origin, given eccentricity e = 3 mm, outer rotor radius r

[0059] S1: Draw base circle with O as center and e = 3 mm as radius.

[0060] S2: On the base circle, locate points Q and G by measuring 160° and 235° from reference line.

[0061] S3: Draw two auxiliary circles with Q and G as centers and r

[0062] S4: Draw intersection point N of the two auxiliary circles, and connect N and O, the connecting line intersects the base circle at point M.

[0063] S5: Draw rotor inner circle locus with M as center and r

[0064] S6: The common area bounded by the above base circle, two auxiliary circles and rotor inner circle locus is the settable area of injection port (2-3-4).

[0065] S7: A maximum inscribed circle is made in the region, and the diameter of the circle is the maximum allowable diameter of the injection port. According to engineering practice, a circular hole with a diameter of 1.5 mm can be determined as the final processing shape of the injection port (2-3-4).

[0066] Through motion simulation verification, the position meets the requirements of opening, sealing and no interference.

[0067] Through testing, the compressor manufactured by using the design and method of the embodiment has a heating capacity that is increased by about 22.3% and an exhaust temperature that is reduced by about 18.7°C under a low-temperature condition of-25°C, and the energy efficiency ratio is increased by about 15.8%, verifying the effectiveness and advancement of the present application.

[0068] Embodiment 3 The embodiment discloses a jet augmenting compressor, which comprises a cylinder assembly 1, a core assembly 2 arranged inside the cylinder assembly 1, a motor 3 connected to the core assembly 2, an upper cover assembly 4 arranged at the upper end of the cylinder assembly 1, and a main circuit liquid reservoir 5 and a jet liquid reservoir 7 arranged outside the cylinder assembly 1 and in communication with the inside of the core assembly 2. The main circuit liquid reservoir 5 and the jet liquid reservoir 7 are fixed outside the cylinder through supports and clamps 11. Main circuit gas enters the gas inlet hole 2-2-1 of the upper cylinder 2-2 through the main circuit liquid reservoir 5 and the cylinder insertion pipe 6. The gas is divided into two paths in the U-shaped cavity 2-2-2 and enters the upper and lower cylinder cavities respectively. Jet circuit gas enters the jet passage 2-3-1, 2-3-2 of the partition plate 2-3 through the jet liquid reservoir 7 and the injection needle 8 and is finally injected into the compression cavity through the injection port 2-3-4. The jet augmenting circuit is arranged in the core assembly 2.

[0069] Further, in the embodiment, the core assembly 2 has the following specific structure. The core assembly 2 comprises a crankshaft 2-5, and the crankshaft 2-5 is sequentially provided with an upper muffler 2-8, an upper rotor 2-6, a partition plate 2-3, a lower rotor 2-7 and a lower muffler 2-9 from top to bottom. The upper rotor 2-6 is sleeved with the upper cylinder 2-2 outside, and the lower rotor 2-7 is sleeved with the lower cylinder 2-4 outside. The jet augmenting circuit is arranged on the partition plate 2-3, and the jet augmenting circuit is connected to the upper cylinder compression cavity and the lower cylinder compression cavity respectively. The partition plate 2-3 is provided with a through hole 2-3-3, and the through hole 2-3-3 communicates the upper cylinder 2-2 and the lower cylinder 2-4.

[0070] Further, the upper cylinder 2-2 and the lower cylinder 2-4 have the following structure. The upper cylinder 2-2 is provided with an air inlet hole 2-2-1 and a U-shaped cavity 2-2-2, the U-shaped cavity 2-2-2 is perpendicular to the upper and lower end faces of the upper cylinder, the cavity 2-2-2 is located on one side of the upper cylinder cavity 2-2-3, one end of the cavity 2-2-2 is communicated with the air inlet hole 2-2-1, and the other end is flush with the end face of the upper cylinder cavity 2-2-3; The lower cylinder 2-4 is provided with a U-shaped groove 2-4-1, which is a sunken groove and is perpendicular to the upper and lower end faces of the lower cylinder, the groove 2-4-1 is arranged on one side of the lower cylinder cavity 2-4-2, one end of the groove 2-4-1 is communicated with the lower cylinder cavity 2-4-2, and the other end of the groove 2-4-1 is closed; The partition plate 2-3 is provided with a flow-through channel 2-3-1 and an injection channel 2-3-2 for injecting the enthalpy-increasing gas, the flow-through channel 2-3-1 and the injection channel 2-3-2 are perpendicular to each other and communicated with each other, the flow-through channel 2-3-1 is arranged along the radial direction of the partition plate 2-3, the injection channel 2-3-2 is arranged along the axial direction of the partition plate 2-3, and the partition plate 2-3 is further provided with a through hole 2-3-3 for communicating the cavity 2-2-2 and the groove 2-4-1.

[0071] Further, the outlet of the injection reservoir 7 is provided with an injection needle 8 of the injection circuit, one end of the injection needle 8 is communicated with the injection reservoir 7, and the other end of the injection needle 8 is communicated with the flow-through channel 2-3-1.

[0072] Further, the gas flow path of the main circuit is as follows: The refrigerant gas enters the air inlet pipe 5-1 of the main circuit reservoir 5, passes through the reservoir cylinder 5-2, passes through the air outlet elbow 5-3, enters the air inlet hole 2-2-1 through the main circuit cylinder insertion pipe 6, and is divided into two paths by the cavity 2-2-2, one path enters the upper cylinder cavity 2-2-3, and the other path enters the groove 2-4-1 of the lower cylinder 2-4 through the through hole 2-3-3 of the partition plate 2-3, and finally enters the lower cylinder cavity 2-4-2.

[0073] Further, the gas flow path of the injection circuit is as follows: The enthalpy-increasing refrigerant gas enters the air inlet pipe 7-1 of the injection reservoir 7, passes through the injection circuit reservoir cylinder 7-2, passes through the air outlet elbow 7-3, is injected into the flow-through channel 2-3-1 of the partition plate 2-3 through the injection needle 8 of the injection circuit, and then enters the injection channel 2-3-2, and finally is injected into the upper cylinder compression chamber and / or the lower cylinder compression chamber.

[0074] Further, the air outlet elbow 7-3 of the injection reservoir 7 is designed to be bent, and is assembled to be located in the area between the main circuit reservoir 5 and the cylinder assembly 1, so that the circumferential space of the compressor during installation is effectively saved.

[0075] Further, the injection reservoir 7 is fixed with the injection circuit injection needle 8 and the cylinder connecting pipe 1-1 by welding, the upper end is fixed on the cylinder by the clamp 9, the structure is stable, and the sealing performance and mechanical strength of the connection are guaranteed.

[0076] Further, the gas outlet elbow 7-3 of the injection reservoir 7 is designed in a specific angle, so that the injection reservoir 7 can be compactly arranged in the narrow space between the main circuit reservoir 5 and the cylinder 1, and the external size of the whole machine is greatly optimized.

[0077] The embodiment of the present application realizes the efficient distribution of the main circuit gas and the precise injection of the injection circuit gas by the unique U-shaped cavity and U-shaped groove flow path design, and the gas flow efficiency is improved. The scientific iterative calculation model is used to determine the injection port position, the experience design is replaced, and the efficiency and control accuracy of the jet augmenting are significantly improved. The experimental results show that the heating capacity can be increased by 15-25%, and the exhaust temperature can be reduced by 10-20°C. The elbow design and compact layout of the injection reservoir optimize the whole machine structure and save the installation space. The method has strong universality and repeatability, is suitable for various types of compressors and refrigerants, and reduces the development cost and cycle.

[0078] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of determining an injection port for an ejector of an augmented jet compressor, characterized in that, The method comprises the following steps: Determining the opening angle θ of a jet in a jet augmentor circuit in a compressor open and the closing angle θ close ; Take the center O (2-2-6) of the compressor cylinder as the center and the eccentric distance e of the eccentric shaft as the radius to draw a base circle; On the base circle, starting from the reference line, rotating according to the opening angle θ open and the closing angle θ close to obtain the positioning point Q and the positioning point G; Take the positioning point Q and the positioning point G as the centers and the outer radius of the rotor (2-6) as the radius to draw two auxiliary circles; Connect the intersection N of the two auxiliary circles and the center O (2-2-6) of the cylinder to obtain a straight line L; Take the intersection M of the straight line L and the base circle as the center and the inner radius of the rotor (2-6) as the radius to draw the inner circle of the rotor; Select the common area of the base circle, the two auxiliary circles and the inner circle of the rotor as the opening area of the injection port (2-3-4), and draw the largest inscribed circle in the opening area to determine the opening position of the injection port (2-3-4).

2. The method of claim 1, wherein, The determination of the opening angle θ of the nozzle in the ejector of the ejector cycle in the compressor open and the closing angle θclose, comprises: Setting the opening angle θ open is selected in the range between 10° before the intake port of the compressor is closed and complete closing; The closing angle θ close The determination includes: Set initial parameters, determine the initial gas pressure of the compressor injection port, with crank angle as the variable, θ open As the beginning, start rotating, real-time calculate the pressure of the compression chamber during rotation, when the pressure of the compression chamber is greater than the initial gas pressure of the injection port, the current angle is the closing angle θ close of the injection port.

3. The method of claim 1, wherein: Also included is setting the closing angle θ close Determined verification condition: When the pressure of the compression chamber is greater than the initial gas pressure of the injection port, the current injection port cumulative injected gas mass m is calculated inj-total , if the cumulative injected gas mass m inj-total is less than the initial injected gas mass m inj-req , the injection port parameters are adjusted, and the calculation is iterated again until the cumulative injected gas mass m inj-total is greater than or equal to the initial injected gas mass m inj-req , and the current angle is the closing angle θ close .

4. A jet augmenting compressor characterized by, The injection port is arranged in the injection port opening position of the jet augmenting circuit in the compressor. The method is determined according to claim 1.

5. A Brayton jet augmenting compressor as claimed in claim 4, wherein, The cylinder assembly (1) is internally provided with a core assembly (2), the core assembly (2) is connected with a motor (3), the upper end of the cylinder assembly (1) is provided with an upper cover assembly (4), the outer side of the cylinder assembly (1) is provided with a main circuit liquid reservoir (5) and a jet liquid reservoir (7), and the main circuit liquid reservoir (5) and the jet liquid reservoir (7) are both in communication with the inside of the core assembly (2). The jet augmenting circuit is arranged in the core assembly (2).

6. A Brayton jet augmenting compressor as recited in claim 5, wherein, The core assembly (2) comprises a crankshaft (2-5), and the crankshaft (2-5) is sequentially provided, from top to bottom, with an upper cover (2-1), an upper silencer cover (2-8), an upper rotor (2-6), a partition plate (2-3), a lower rotor (2-7) and a lower silencer cover (2-9). The outer side of the upper rotor (2-6) is provided with an upper cylinder (2-2), and the outer side of the lower rotor (2-7) is provided with a lower cylinder (2-4). The jet augmenting circuit is arranged on the partition plate (2-3), the jet augmenting circuit is connected with the upper cylinder compression cavity and the lower cylinder compression cavity respectively, the partition plate (2-3) is provided with a through hole (2-3-3), and the through hole (2-3-3) is in communication with the upper cylinder (2-2) and the lower cylinder (2-4).

7. A Brayton jet augmenting compressor as claimed in claim 6, wherein, The jet augmenting circuit comprises a flow channel (2-3-1), one end of the flow channel (2-3-1) is in communication with the jet liquid reservoir (7), the other end of the flow channel (2-3-1) is in communication with an injection channel (2-3-2), one end of the injection channel (2-3-2) is in communication with the upper cylinder compression cavity, the other end of the injection channel (2-3-2) is in communication with the lower cylinder compression cavity, and the port of the injection channel (2-3-2) is the injection port (2-3-4).

8. A Brayton jet augmenting compressor as claimed in claim 7, characterized in that, The upper cylinder (2-2) is provided with an air inlet hole (2-2-1), the air inlet hole (2-2-1) is in communication with a type cavity (2-2-2), the type cavity (2-2-2) is arranged along the axial direction of the upper cylinder (2-2), the type cavity (2-2-2) is located on one side of the upper cylinder cavity (2-2-3), the type cavity (2-2-2) is in communication with the upper cylinder cavity (2-2-3), both ends of the type cavity (2-2-2) are flush with both ends of the upper cylinder cavity (2-2-3), and the upper end and the lower end of the type cavity (2-2-2) are through holes. The lower air cylinder (2-4) is provided with a type groove (2-4-1), the type groove (2-4-1) is provided along the axial direction of the lower air cylinder (2-4), the type groove (2-4-1) is a sunken groove, the type groove (2-4-1) is provided on one side of the lower air cylinder cavity (2-4-2), and the type groove (2-4-1) is communicated with the lower air cylinder cavity (2-4-2). The through hole (2-3-3) is communicated with the type cavity (2-2-2) at the upper end and with the type groove (2-4-1) at the lower end.

9. A Brayton cycle turbo-compressor as claimed in claim 7, wherein, An injection circuit injection needle (8) is arranged at the outlet of the injection reservoir (7), one end of the injection circuit injection needle (8) is communicated with the injection reservoir (7), and the other end is communicated with the through channel (2-3-1).

10. An air conditioner characterized by comprising: The ejection augmented compressor comprises the injection circuit injection needle (8).

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