Fluid machine and method for operating same

Abstract

The invention provides a fluid machine and an operation method thereof. The fluid machine comprises a body, a screw set, a capacity adjusting mechanism, a medium-pressure sensor and a controller, and a low-pressure cavity, a medium-pressure cavity and a high-pressure cavity are formed in the body; the screw set comprises a pair of first screws contained in the low-pressure cavity and a pair of second screws contained in the high-pressure cavity. The capacity adjusting mechanism comprises a first slide valve arranged corresponding to the first screw rod and a second slide valve arranged corresponding to the second screw rod; the medium-pressure sensor is accommodated in the medium-pressure chamber and obtains the indoor pressure of the medium-pressure chamber; the controller drives the first sliding valve and the second sliding valve to move, and the controller moves the relative position of the first sliding valve and the first screw and the relative position of the second sliding valve and the second screw based on the rotating speed of coaxial rotation of the first screw and the second screw and the numerical value of the indoor pressure.

Description

Technical Field

[0001] The present invention relates to a fluid machine such as a compressor or an expander, and more particularly to a fluid machine and an operating method thereof. Background Art

[0002] The existing common two-stage screw machine has a low-pressure chamber, a medium-pressure chamber and a high-pressure chamber connected in sequence. The low-pressure chamber accommodates the first-stage rotor, the high-pressure chamber accommodates the second-stage rotor, and the medium-pressure chamber accommodates the motor and the rotating shaft connecting the first and second-stage rotors. The fluid (such as refrigerant, coolant, etc.) is compressed by the first and second-stage rotors in turn, so that the fluid pressures in the low-pressure chamber, the medium-pressure chamber and the high-pressure chamber are low pressure, medium pressure and high pressure respectively.

[0003] However, the medium pressure of the medium pressure chamber of the traditional two-stage screw machine cannot be adjusted and can only passively adapt to changes in system pressure, making it impossible for the two-stage screw machine to obtain the optimal efficiency value; even when the suction pressure is too high, the pressure (medium pressure) of the medium pressure chamber will be too high, which will cause the medium pressure chamber and the high pressure chamber to be unable to spray lubricating fluid, resulting in insufficient oil supply pressure difference of the second stage rotor and other problems, thereby reducing the efficiency value of the two-stage screw machine.

[0004] In view of this, the present invention provides a fluid machine and an operating method thereof for the above-mentioned prior art to solve the problems existing in the above-mentioned prior art. Summary of the invention

[0005] The present invention provides a fluid machinery and an operating method thereof, wherein a controller is used to move the relative positions of a first slide valve and the first screw, and the relative positions of a second slide valve and the second screw based on the rotational speed of the coaxial rotation of a first screw and a second screw and the indoor pressure value of a medium-pressure chamber, thereby adjusting the indoor pressure of the medium-pressure chamber to avoid excessive pressure, thereby ensuring that lubricating fluid can be stably sprayed into the medium-pressure chamber and the high-pressure chamber, and continuously lubricating the second screw, so that the fluid machinery has good operating efficiency.

[0006] In an embodiment of the present invention, the present invention provides a fluid machine, comprising: a body, internally divided into a low-pressure chamber, a medium-pressure chamber and a high-pressure chamber which are sequentially connected; a screw assembly, comprising a pair of first screws accommodated in the low-pressure chamber and meshed with each other, and a pair of second screws accommodated in the high-pressure chamber and meshed with each other, the pair of first screws defining a first contact line, and the pair of second screws defining a second contact line; a drive module accommodated in the medium-pressure chamber, the drive module connecting and driving the first screw and the second screw to rotate coaxially; a capacity regulating machine The invention discloses a structure comprising a first sliding valve movably arranged corresponding to the first contact line and a second sliding valve movably arranged corresponding to the second contact line; a medium pressure sensor housed in the medium pressure chamber, the medium pressure sensor obtaining a room pressure of the medium pressure chamber; and a controller connected to and driving the first sliding valve and the second sliding valve to move, the controller moves the relative positions of the first sliding valve and the pair of first screws, and the relative positions of the second sliding valve and the pair of second screws based on the rotation speed of the coaxial rotation of the first screw and the second screw and the value of the room pressure.

[0007] In an embodiment of the present invention, the present invention provides an operating method for a fluid machinery, the steps of which include: A) providing a fluid machinery as described above, arranging the first slide valve between the medium-pressure chamber and the first discharge end, arranging the second slide valve between the exhaust port and the second discharge end, and the driving module driving the first screw and the second screw to rotate at a preset speed and frequency; B) the controller controls the second slide valve to move from between the exhaust port and the second discharge end toward the second suction end; and C) the controller controls the first slide valve to move from between the medium-pressure chamber and the first discharge end toward the first suction end until the medium-pressure sensor senses that the indoor pressure of the medium-pressure chamber is equal to a preset medium-pressure pressure.

[0008] In an embodiment of the present invention, the present invention provides an operating method of a fluid machinery, the steps of which include: F) providing a fluid machinery as described above, arranging the first slide valve between the medium-pressure chamber and the first discharge end, arranging the second slide valve between the exhaust port and the second discharge end, and the driving module driving the first screw and the second screw to rotate at a preset speed and fixed frequency; G) the controller controls the first slide valve to move from the first discharge end toward the first suction end to cover the first suction end, and the second slide valve to move from the second discharge end to the second suction end until one end of the second slide valve is arranged between the second suction end and the second discharge end and the other end is arranged between the exhaust port and the second discharge end; and H) the controller first controls the first radial notch to be located at a specified position between the first suction end and the first discharge end, and then controls the second slide valve to move toward the second suction end or the second discharge end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to a preset medium pressure.

[0009] In an embodiment of the present invention, the present invention provides an operating method for a fluid machinery, the steps of which include: K) providing a fluid machinery as described above, setting the first radial notch between the first suction end and the middle of the pair of first screws, and the driving module driving one of the first screws and one of the second screws to start increasing speed to a low speed rotation; L) the controller controls the second slide valve to move from the second discharge end toward the second suction end until the second slide valve has one end set between the second suction end and the second discharge end and the other end set between the exhaust port and the second discharge end, and the driving module drives one of the first screws and one of the second screws to continue increasing speed to a predetermined speed and rotate at a constant speed; and M) the controller first controls the first radial notch to be located at a specified position between the first suction end and the first discharge end, and then controls the second slide valve to move toward the second suction end or the second discharge end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to a preset medium pressure.

[0010] Based on the above, the controller of the present invention moves the relative positions of the first slide valve and the pair of first screws, and the relative positions of the second slide valve and the pair of second screws based on the rotational speed of the first screw and the second screw and the indoor pressure value of the medium-pressure chamber, and then adjusts the indoor pressure of the medium-pressure chamber to maintain the indoor pressure of the medium-pressure chamber at a preset medium-pressure pressure to ensure that the lubricating fluid can be stably sprayed into the medium-pressure chamber and the high-pressure chamber. After entering the medium-pressure chamber, the lubricating fluid will follow the flow of the fluid and continuously lubricate the second screw, so as to achieve good operating efficiency of the fluid machinery of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a side view schematic diagram of the fluid machinery of the present invention;

[0012] Figure 2 It is a front view schematic diagram of the fluid machinery of the present invention;

[0013] Figure 3 is a block diagram of the controller, the first slide valve and the second slide valve of the present invention;

[0014] Figure 4 The first step of the method for operating a fluid machine of the present invention is a flow chart;

[0015] Figure 5 This is a schematic diagram of a first use state of the fluid machinery of the present invention;

[0016] Figure 6 It is a schematic diagram of a second use state of the fluid machinery of the present invention;

[0017] Figure 7 It is a schematic diagram of the third use state of the fluid machinery of the present invention;

[0018] Figure 8 The flowchart of the second step of the method for operating the fluid machinery of the present invention;

[0019] Fig. 9 It is a schematic diagram of a fourth use state of the fluid machinery of the present invention;

[0020] Fig.10 It is a schematic diagram of the fifth use state of the fluid machinery of the present invention;

[0021] Fig.11 It is a schematic diagram of the sixth use state of the fluid machinery of the present invention;

[0022] Fig.12 It is a schematic diagram of the seventh use state of the fluid machinery of the present invention;

[0023] Fig.13 It is a schematic diagram of the eighth use state of the fluid machinery of the present invention;

[0024] Fig.14 The third step flow chart of the method for operating a fluid machine of the present invention;

[0025] Fig.15 It is a schematic diagram of the ninth use state of the fluid machinery of the present invention;

[0026] Fig.16 It is a schematic diagram of the tenth use state of the fluid machinery of the present invention;

[0027] Fig.17 This is a schematic diagram of the eleventh use state of the fluid machinery of the present invention;

[0028] Fig.18 It is a schematic diagram of the twelfth use state of the fluid machinery of the present invention;

[0029] Fig.19 This is a schematic diagram of the thirteenth use state of the fluid machinery of the present invention;

[0030] Wherein, the reference numerals are:

[0031] 10: Fluid Machinery

[0032] 1: Ontology

[0033] 11: Low pressure chamber

[0034] 12: Medium pressure chamber

[0035] 13: High pressure chamber

[0036] 14: First auxiliary chamber

[0037] 15: Second auxiliary chamber

[0038] 16: Intake port

[0039] 17: Exhaust port

[0040] 2: Screw group

[0041] 21: First screw

[0042] 211: First suction port

[0043] 212: First discharge end

[0044] 22: Second screw

[0045] 221: Second suction port

[0046] 222: Second discharge end

[0047] 3: Driver module

[0048] 31: Motor

[0049] 32: Drive shaft

[0050] 4: Capacity adjustment mechanism

[0051] 41: First slide valve

[0052] 411: First low voltage end

[0053] 412: First radial notch

[0054] 42: Second slide valve

[0055] 421: Second low voltage end

[0056] 422: Second radial notch

[0057] 5: Medium pressure sensor

[0058] 6: Controller

[0059] Z1: First contact line

[0060] Z2: Second contact line

[0061] Steps A to O. DETAILED DESCRIPTION

[0062] The detailed description and technical contents of the present invention are described as follows with reference to the accompanying drawings. However, the accompanying drawings are only provided for reference and description and are not intended to limit the present invention.

[0063] Please refer to Figures 1 to 19 As shown, the present invention provides a fluid machine and an operating method thereof. The fluid machine 10 mainly includes a body 1, a screw group 2, a driving module 3, a capacity adjustment mechanism 4, a medium pressure sensor 5 and a controller 6.

[0064] like Figure 1 to Figure 2 As shown, the body 1 is internally divided into a low-pressure chamber 11, a medium-pressure chamber 12 and a high-pressure chamber 13 which are connected in sequence. The body 1 is provided with a first auxiliary chamber 14 which is arranged on one side of the low-pressure chamber 11 and is connected to the low-pressure chamber 11, and a second auxiliary chamber 15 which is arranged on one side of the high-pressure chamber 13 and is connected to the high-pressure chamber 13. The low-pressure chamber 11 is provided with an air inlet 16, and the high-pressure chamber 13 is provided with an air outlet 17. Among them, the medium-pressure chamber 12 and the high-pressure chamber 13 are connected to an oil storage tank (not shown in the figure), and the oil storage tank (not shown in the figure) is used to spray lubricating liquid into the medium-pressure chamber 12 and the high-pressure chamber 13.

[0065] like Figure 1 to Figure 2 As shown, the screw assembly 2 includes a pair of first screws 21 accommodated in the low-pressure chamber 11 and meshing with each other, and a pair of second screws 22 accommodated in the high-pressure chamber 13 and meshing with each other. A first contact line Z1 is defined between the meshing male helical tooth surfaces and female helical tooth surfaces of the pair of first screws 21, and a second contact line Z2 is defined between the meshing male helical tooth surfaces and female helical tooth surfaces of the pair of second screws 22.

[0066] In addition, two ends of the pair of first screws 21 have a first suction end 211 and a first discharge end 212 , and two ends of the pair of second screws 22 have a second suction end 221 and a second discharge end 222 .

[0067] Among them, the fluid (such as refrigerant, coolant, etc.) starts from the air intake port 16 and passes through the low-pressure chamber 11, the first suction end 211 of the first screw 21, the first discharge end 212 of the first screw 21, the medium-pressure chamber 12, the high-pressure chamber 13, the second suction end 221 of the second screw 22 and the second discharge end 222 of the second screw 22 in sequence, and is finally discharged from the exhaust port 17. Since the fluid is compressed by the first screw 21 and the second screw 22 in turn, the fluid pressures in the low-pressure chamber 11, the medium-pressure chamber 12 and the high-pressure chamber 13 are low pressure, medium pressure and high pressure respectively.

[0068] In addition, the fluid machine 10 of the present invention further includes an evaporator (not disclosed in the figure) and a temperature sensor (not disclosed in the figure) installed on the evaporator (not disclosed in the figure). The fluid flows in the low-pressure chamber 11, the medium-pressure chamber 12, the high-pressure chamber 13 and the evaporator (not disclosed in the figure). The temperature sensor or the pressure sensor (not disclosed in the figure) is used to sense and obtain the temperature and pressure of the evaporator (not disclosed in the figure). Among them, the above temperature can be the set temperature of the evaporator or the temperature of the environment in which the evaporator is manufactured. The controller can use the measured temperature and pressure to calculate the refrigerant saturation temperature to control the capacity adjustment mechanism 4.

[0069] like Figure 1As shown, the driving module 3 is accommodated in the medium pressure chamber 12, and the driving module 3 includes a motor 31 and one or two driving shafts 32 connected to the motor 31, the pair of first screws 21 and the pair of second screws 22. The motor 31 is connected through the driving shaft 32 and drives one of the first screws 21 and one of the second screws 22 to rotate coaxially.

[0070] Among them, in this embodiment, the number of driving shafts 32 is one, which jointly drives the first screw 21 and the second screw 22 to rotate coaxially, but this is not limited to the number. The number of driving shafts 32 can be two, and the rotation axes of the two driving shafts 32 are located on the same line. One driving shaft 32 is connected to the motor 31 and the first screw 21, and the other driving shaft 32 is connected to the motor 31 and the second screw 22, thereby driving the first screw 21 and the second screw 22 to rotate coaxially respectively.

[0071] like Figure 1 to Figure 2 As shown, the capacity adjustment mechanism 4 includes a first sliding valve 41 movably arranged corresponding to the first contact line Z1 and a second sliding valve 42 movably arranged corresponding to the second contact line Z2. The first sliding valve 41 is accommodated and slides in the first auxiliary chamber 14, and the second sliding valve 42 is accommodated and slides in the second auxiliary chamber 15.

[0072] The detailed description is as follows: one end of the first sliding valve 41 has a first low-pressure end 411 configured corresponding to the first suction end 211, and the other end is provided with a first radial notch 412 configured corresponding to the first contact line Z1. The more area the first sliding valve 41 covers the pair of first screws 21, the larger the working area of ​​the pair of first screws 21, and the higher the refrigerant suction pressure. The first radial notch 412 can be set at any groove of the spiral groove of the pair of first screws 21, thereby controlling when the low-pressure chamber 11 is exhausted and its exhaust pressure. The closer the position of the first radial notch 412 is to the first discharge end 212, the greater the exhaust pressure.

[0073] In addition, one end of the second sliding valve 42 has a second low-pressure end 421 configured corresponding to the second suction end 221 and the other end is provided with a second radial notch 422 configured corresponding to the second contact line Z2. The more area of ​​the second sliding valve 42 that is shielded by the second screw 22, the larger the working area of ​​the second screw 22 and the higher the refrigerant suction pressure. The second radial notch 422 can be set at any groove of the spiral groove of the second screw 22, thereby controlling when the high-pressure chamber 13 is exhausted and its exhaust pressure. The closer the position of the second radial notch 422 is to the second discharge end 222, the greater the exhaust pressure.

[0074] like Figure 1 to Figure 2 As shown, the medium pressure sensor 5 is accommodated in the medium pressure chamber 12 , and the medium pressure sensor 5 is used to sense and obtain a chamber pressure of the medium pressure chamber 12 , that is, the medium pressure sensor 5 is used to sense the chamber pressure of the medium pressure chamber 12 and generate a medium pressure chamber pressure signal.

[0075] In addition, a pressure sensor (not shown) is also installed inside the air inlet 16 . The pressure sensor (not shown) is used to sense and obtain the pressure of the air inlet 16 .

[0076] like Figure 3 As shown, the controller 6 is connected to and drives the first slide valve 41 and the second slide valve 42 to move. The controller 6 moves the relative position of the first slide valve 41 and the pair of first screws 21, and moves the relative position of the second slide valve 42 and the pair of second screws 22 based on the rotation speed of the coaxial rotation of the first screw 21 and the second screw 22 and the value of the indoor pressure. That is, after the controller 6 receives the pressure signal of the medium-pressure chamber and the pressure signal of the suction port 16, it will judge and calculate and move the relative position of the first slide valve 41 and the second slide valve 42.

[0077] like Figure 4 As shown, the first step of the method for operating the fluid machinery 10 of the present invention is further described as follows: First, as Figure 4 Step A and Figure 5 As shown, a fluid machine 10 as described above is provided, wherein the first slide valve 41 is disposed between the medium-pressure chamber 12 and the first discharge end 212, and the second slide valve 42 is disposed between the exhaust port 17 and the second discharge end 222. The driving module 3 drives a first screw 21 and a second screw 22 thereof to rotate at a preset speed and a fixed frequency. The preset speed is between 2950 and 3600 rpm, that is, the speed frequency of the pair of first screws 21 and the pair of second screws 22 is a fixed frequency. When the first screw 21 and the second screw 22 start to rotate, the medium-pressure chamber 12 and the high-pressure chamber 13 start to be injected with lubricating fluid.

[0078] Second, if Figure 4 Step B and Figure 6 As shown, the controller 6 controls the second slide valve 42 to move from between the exhaust port 17 and the second discharge end 222 toward the second suction end 221 , thereby increasing the suction volume of the pair of second screws 22 .

[0079] Third, if Figure 4 Step C and Figure 6 As shown, the controller 6 controls the first slide valve 41 to move from between the medium pressure chamber 12 and the first discharge end 212 toward the first suction end 211, thereby increasing the suction volume of the pair of first screws 21, until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to the preset medium pressure. The position of the first slide valve 41 is calculated by the controller 6 based on the signal of the refrigerant saturation temperature of the evaporator and the indoor pressure of the medium pressure chamber 12.

[0080] Fourth, if Figure 4 Step D and Figure 7As shown, when the first slide valve 41 moves to cover the first suction end 211, and the length of the second slide valve 42 between the second suction end 221 and the second discharge end 222 is equal to or less than 80% of the total length of the second slide valve 42, and the indoor pressure of the medium-pressure chamber 12 is still not equal to the preset medium pressure, the controller 6 first controls the first radial notch 412 to be located at a specified position between the first suction end 211 and the first discharge end 212, and then controls the second slide valve 42 to move toward the second suction end 221 (increasing the suction volume of the pair of second screws 22) or the second discharge end 222 (reducing the suction volume of the pair of second screws 22) until the medium pressure sensor 5 senses that the indoor pressure of the medium-pressure chamber 12 is equal to the preset medium pressure.

[0081] The designated position is calculated by the controller 6 according to the pressure of the air inlet 16 , the refrigerant saturation temperature of the evaporator and the indoor pressure signal of the medium pressure chamber 12 .

[0082] In addition, step D is a special case and may not necessarily occur, and may be omitted depending on the actual operation method of the fluid machinery 10 of the present invention.

[0083] like Figure 4 Step E and Figure 5 As shown, the controller 6 controls the first slide valve 41 to move toward the first discharge end 212 first, and the second slide valve 42 to move toward the second suction end 221 first, and then the drive module 3 stops rotating. After the first screw 21 and the second screw 22 stop rotating, the medium-pressure chamber 12 and the high-pressure chamber 13 stop injecting lubricating fluid, and the first slide valve 41 is set between the medium-pressure chamber 12 and the first discharge end 212, and the second slide valve 42 is set between the exhaust port 17 and the second discharge end 222.

[0084] Therefore, because the stop positions of the first slide valve 41 and the second slide valve 42 are incorrect, the next time the drive module 3 starts and drives its first screw 21 and its second screw 22 to rotate, it may cause the structural load of the screw group 2 and the drive module 3 to be too large or the exhaust pressure of the first discharge end 212 to be too high, causing damage to the fluid machinery 10.

[0085] like Figure 8 As shown, the second step of the method for operating the fluid machinery 10 of the present invention is further described as follows: First, as Figure 8 Step F and Fig. 9As shown, a fluid machine 10 as described above is provided, wherein the first slide valve 41 is disposed between the medium-pressure chamber 12 and the first discharge end 212, and the second slide valve 42 is disposed between the exhaust port 17 and the second discharge end 222. The driving module 3 drives a first screw 21 and a second screw 22 thereof to rotate at a preset speed and a fixed frequency. The preset speed is between 2950 and 3600 rpm, that is, the speed frequency of the pair of first screws 21 and the pair of second screws 22 is a fixed frequency. When the first screw 21 and the second screw 22 start to rotate, the medium-pressure chamber 12 and the high-pressure chamber 13 start to be injected with lubricating fluid.

[0086] Second, if Figure 8 Step G and Fig.10 As shown, the controller 6 controls the first slide valve 41 to move from the first discharge end 212 to the first suction end 211 to cover the first suction end 211, and the second slide valve 42 to move from the second discharge end 222 to the second suction end 221 to the second slide valve 42, one end of which is located between the second suction end 221 and the second discharge end 222 and the other end of which is located between the exhaust port 17 and the second discharge end 222. The position of the first slide valve 41 is calculated by the controller 6 based on the signal of the refrigerant saturation temperature of the evaporator and the indoor pressure of the medium pressure chamber 12, and the position of the second slide valve 42 is calculated by the controller 6 based on the indoor pressure of the medium pressure chamber 12 sensed by the medium pressure sensor 5 to be equal to the preset medium pressure.

[0087] Third, if Figure 8 Step H and Fig.11 As shown, the controller 6 first controls the first radial notch 412 to be located at a specified position between the first suction end 211 and the first discharge end 212, and then controls the second slide valve 42 to move toward the second suction end 221 (increasing the suction volume of the pair of second screws 22) or the second discharge end 222 (reducing the suction volume of the pair of second screws 22) until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to a preset medium pressure.

[0088] Among them, in step H, the length of the second slide valve 42 between the second suction end 221 and the second discharge end 222 is equal to or less than 80% of the total length of the second slide valve 42, that is, the second slide valve 42 covers the screw area of ​​the pair of second screws 22 equal to 80% or less than 80%, and at least 20% of the screw area of ​​the pair of second screws 22 will be reserved for adjusting the indoor pressure of the medium-pressure chamber 12 to avoid the indoor pressure of the medium-pressure chamber 12 from continuing to rise and being unable to be adjusted. The designated position is calculated by the controller 6 based on the pressure of the suction port 16, the refrigerant saturation temperature of the evaporator and the signal of the indoor pressure of the medium-pressure chamber 12.

[0089] Fourth, if Figure 8 Step I1 and Fig.12As shown, when the length of the second slide valve 42 between the second suction end 221 and the second discharge end 222 is equal to 80% of the total length of the second slide valve 42, and the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is still higher than the preset medium pressure, the medium pressure chamber 12 and the high pressure chamber 13 cannot be smoothly injected with lubricating fluid, and the controller 6 controls the second slide valve 42 to continue to move toward the second suction end 221, that is, the second slide valve 42 covers more than 80% of the screw area of ​​the pair of second screws 22, thereby increasing the suction volume of the pair of second screws 22, until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to the preset medium pressure, and the lubricating fluid can be smoothly injected into the medium pressure chamber 12 and the high pressure chamber 13.

[0090] In addition, when the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is lower than the preset medium pressure, the controller 6 controls the second slide valve 42 to move from the second suction end 221 toward the second discharge end 222, thereby reducing the suction volume of the pair of second screws 22 until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to the preset medium pressure.

[0091] Fifth, if Figure 7 Step I2 and Fig.13 As shown, when the second slide valve 42 covers the second suction end 221 and the indoor pressure of the medium pressure chamber 12 is still higher than the preset medium pressure, the controller 6 controls the first slide valve 41 to move away from the first suction end 211 toward the first discharge end 212, thereby reducing the suction volume of the pair of first screws 21 until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to the preset medium pressure.

[0092] In addition, steps I1 and I2 are special cases, and steps I1 and I2 may not necessarily occur, and may be omitted depending on the actual operation method of the fluid machinery 10 of the present invention.

[0093] Sixth, if Figure 7 Step J and Fig. 9 As shown, the controller 6 controls the first slide valve 41 to move toward the first discharge end 212 first, and the second slide valve 42 to move toward the second suction end 221 first, and then the drive module 3 stops rotating. After the first screw 21 and the second screw 22 stop rotating, the medium-pressure chamber 12 and the high-pressure chamber 13 stop injecting lubricating fluid, and the first slide valve 41 is set between the medium-pressure chamber 12 and the first discharge end 212, and the second slide valve 42 is set between the exhaust port 17 and the second discharge end 222.

[0094] Therefore, because the stop positions of the first slide valve 41 and the second slide valve 42 are incorrect, the next time the drive module 3 starts and drives its first screw 21 and its second screw 22 to rotate, it may cause the structural load of the screw group 2 and the drive module 3 to be too large or the exhaust pressure of the first discharge end 212 to be too high, causing damage to the fluid machinery 10.

[0095] like Fig.14 As shown, the third step of the method for operating the fluid machinery 10 of the present invention is further described as follows: First, as Fig.14 Step K and Fig.15 As shown, a fluid machine 10 as described above is provided, wherein the first radial notch 412 is disposed between the first suction end 211 and the middle of the pair of first screws 21, and the driving module 3 drives the first screw 21 and the second screw 22 to start rotating at a low speed, and when the first screw 21 and the second screw 22 start rotating, the medium-pressure chamber 12 and the high-pressure chamber 13 start to inject lubricating fluid.

[0096] Second, if Fig.14 Step L and Fig.16 As shown, the controller 6 controls the second slide valve 42 to move from the second discharge end 222 toward the second suction end 221 until the second slide valve 42 has one end located between the second suction end 221 and the second discharge end 222 and the other end located between the exhaust port 17 and the second discharge end 222. The drive module 3 drives its first screw 21 and its second screw 22 to continue to increase the speed to a predetermined speed and rotate at a constant speed.

[0097] The low speed is the speed of the first screw 21 and the second screw 22 gradually increasing from zero to 1 / 3 to 1 / 2 of the preset speed. For example, the preset speed is between 1200 and 4200 rpm, and the low speed is between 400-2100 rpm, but it is not limited to this.

[0098] In addition, when the rotation speed of the first screw 21 and the second screw 22 continues to increase to reach the preset rotation speed and rotate at a constant speed, but the refrigerant saturation temperature of the evaporator will reach the refrigerant evaporation temperature, the first screw 21 and the second screw 22 will rotate at a constant speed according to the current rotation speed or slightly reduce the speed.

[0099] Third, if Fig.14 Step M and Fig.17 As shown, the controller 6 first controls the first radial notch 412 to be located at a specified position between the first suction end 211 and the first discharge end 212, and then controls the second slide valve 42 to move toward the second suction end 221 (increasing the suction volume of the pair of second screws 22) or the second discharge end 222 (reducing the suction volume of the pair of second screws 22) until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to a preset medium pressure.

[0100] Among them, in step M, the length of the second slide valve 42 between the second suction end 221 and the second discharge end 222 is equal to or less than 80% of the total length of the second slide valve 42, that is, the second slide valve 42 covers the screw area of ​​the pair of second screws 22 equal to 80% or less than 80%, and at least 20% of the screw area of ​​the pair of second screws 22 is reserved for adjusting the indoor pressure of the medium-pressure chamber 12 to avoid the indoor pressure of the medium-pressure chamber 12 from continuing to rise and being unable to be adjusted. The designated position is calculated by the controller 6 based on the pressure of the suction port 16, the refrigerant saturation temperature of the evaporator and the signal of the indoor pressure of the medium-pressure chamber 12.

[0101] Fourth, if Fig.14 Step N1 and Fig.18 As shown, when the length of the second slide valve 42 between the second suction end 221 and the second discharge end 222 is equal to 80% of the total length of the second slide valve 42, and the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is still higher than the preset medium pressure, the lubricating fluid cannot be smoothly injected into the medium pressure chamber 12 at this time, and the controller 6 controls the second slide valve 42 to continue to move toward the second suction end 221, that is, the second slide valve 42 covers more than 80% of the screw area of ​​the pair of second screws 22, thereby increasing the suction volume of the pair of second screws 22, until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to the preset medium pressure.

[0102] In addition, when the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is lower than the preset medium pressure, the controller 6 controls the second slide valve 42 to move from the second suction end 221 toward the second discharge end 222, thereby reducing the suction volume of the pair of second screws 22 until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to the preset medium pressure.

[0103] Fifth, if Fig.14 Step N2 and Fig.19 As shown, when the second slide valve 42 covers the second suction end 221 and the indoor pressure of the medium pressure chamber 12 is still higher than the preset medium pressure, the controller 6 controls the first slide valve 41 to move away from the first suction end 211 toward the first discharge end 212, thereby reducing the suction volume of the pair of first screws 21 until the medium pressure sensor 5 senses that the indoor pressure of the medium pressure chamber 12 is equal to the preset medium pressure.

[0104] In addition, steps N1 and N2 are special cases. Steps N1 and N2 may not necessarily occur and may be omitted depending on the actual operation method of the fluid machinery 10 of the present invention.

[0105] Sixth, if Fig.14 Step O and Fig.15As shown, the driving module 3 first drives a first screw 21 and a second screw 22 to start slowing down to a low speed, that is, the speed of the pair of first screws 21 and the pair of second screws 22 gradually decreases from a preset speed to 1 / 3 to 1 / 2 of the preset speed, and the low speed is between 400-2100rpm, but is not limited to this.

[0106] The driving module 3 is shut down again, and after the first screw 21 and the second screw 22 stop rotating, the injection of lubricating fluid into the medium-pressure chamber 12 and the high-pressure chamber 13 is stopped, and the first radial notch 412 is set between the first suction end 211 and the middle of the pair of first screws 21 .

[0107] Therefore, because the stop position of the first radial notch 412 is incorrect, the next time the drive module 3 starts and drives its first screw 21 and its second screw 22 to rotate, it may cause the screw group 2 and the drive module 3 to have excessive structural load or the exhaust pressure of the first discharge end 212 to be too high, causing damage to the fluid machinery 10.

[0108] Conventional fluid machinery does not consider the indoor pressure of the medium-pressure chamber, resulting in that when the indoor pressure of the medium-pressure chamber is too high, the economizer connected to the medium-pressure chamber and the high-pressure chamber cannot spray lubricating fluid, causing abnormal oil supply to the second screw and reducing efficiency.

[0109] In comparison, Figures 1 to 19 As shown, the controller 6 of the present invention moves the relative positions of the first slide valve 41 and the pair of first screws 21, and the relative positions of the second slide valve 42 and the pair of second screws 22 based on the rotational speed of the first screw 21 and the second screw 22 and the value of the indoor pressure of the medium-pressure chamber 12, thereby adjusting the indoor pressure of the medium-pressure chamber 12 so that the indoor pressure of the medium-pressure chamber 12 is maintained at a preset medium-pressure pressure to ensure that the lubricating fluid can be stably sprayed into the medium-pressure chamber 12 and the high-pressure chamber 13. After entering the medium-pressure chamber 12 and the high-pressure chamber 13, the lubricating fluid will follow the fluid flow and continuously lubricate the second screw 22, so as to achieve good operating efficiency of the fluid machinery 10 of the present invention.

[0110] In summary, the fluid machinery and operating method of the present invention have never been seen in similar products and have not been publicly used. They are industrially applicable, novel and progressive, and fully meet the requirements for patent applications. Therefore, an application is filed in accordance with the Patent Law to protect the rights of the inventor.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the patent protection scope of the present invention. Other equivalent changes that apply the patent spirit of the present invention should all fall within the patent protection scope of the present invention.

Claims

1. A fluid machine, characterized in that: include: A main body, internally divided into a low-pressure chamber, a medium-pressure chamber and a high-pressure chamber which are connected in sequence; a screw assembly, comprising a pair of first screws accommodated in the low-pressure chamber and meshing with each other, and a pair of second screws accommodated in the high-pressure chamber and meshing with each other, wherein the pair of first screws define a first contact line, and the pair of second screws define a second contact line; a driving module, accommodated in the medium-pressure chamber, the driving module is connected to and drives the first screw and the second screw to rotate coaxially; a capacity adjustment mechanism, comprising a first slide valve movably arranged corresponding to the first contact line and a second slide valve movably arranged corresponding to the second contact line; a medium pressure sensor, accommodated in the medium pressure chamber, the medium pressure sensor obtaining a chamber pressure of the medium pressure chamber; as well as A controller is connected to and drives the first slide valve and the second slide valve to move. The controller moves the relative position of the first slide valve and the pair of first screws, and the relative position of the second slide valve and the pair of second screws based on the rotation speed of the coaxial rotation of the first screw and the second screw and the value of the pressure in the chamber.

2. The fluid machinery according to claim 1, characterized in that: The low-pressure chamber is provided with an air intake port, the high-pressure chamber is provided with an air exhaust port, the two ends of the first screw have a first suction end and a first discharge end, the two ends of the second screw have a second suction end and a second discharge end, one end of the first sliding valve has a first low-pressure end corresponding to the first suction end and the other end is provided with a first radial notch corresponding to the first contact line, one end of the second sliding valve has a second low-pressure end corresponding to the second suction end and the other end is provided with a second radial notch corresponding to the second contact line.

3. The fluid machinery according to claim 2, characterized in that: When the rotational speed frequencies of the first screw and the second screw are fixed, the controller controls the second slide valve to move from between the exhaust port and the second discharge end toward the second suction end, and the controller controls the first slide valve to move from between the medium-pressure chamber and the first discharge end toward the first suction end until the indoor pressure of the medium-pressure chamber is equal to a preset medium-pressure pressure.

4. The fluid machinery according to claim 2, characterized in that: The rotational speed frequency of the first screw and the second screw is fixed, the first slide valve covers the first suction end, and one end of the second slide valve is arranged between the second suction end and the second discharge end and the other end is arranged between the exhaust port and the second discharge end, the controller first controls the first radial notch to be located at a specified position between the first suction end and the first discharge end, and then controls the second slide valve to move toward the second suction end or the second discharge end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to a preset medium pressure.

5. The fluid machinery according to claim 2, characterized in that: The first radial notch is arranged between the first suction end and the middle of the pair of first screws, one end of the second slide valve is arranged between the second suction end and the second discharge end and the other end is arranged between the exhaust port and the second discharge end, and when the rotation speed of the pair of first screws and the pair of second screws is increased to a predetermined rotation speed and rotates at a constant speed, the controller first controls the first radial notch to be located at a specified position between the first suction end and the first discharge end, and then controls the second slide valve to move toward the second suction end or the second discharge end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to a preset medium pressure.

6. The fluid machine according to claim 1, characterized in that: The main body is provided with a first auxiliary chamber arranged at one side of the low-pressure chamber and connected to the low-pressure chamber, and a second auxiliary chamber arranged at one side of the high-pressure chamber and connected to the high-pressure chamber, the first sliding valve is accommodated and slides in the first auxiliary chamber, and the second sliding valve is accommodated and slides in the second auxiliary chamber.

7. A method for operating a fluid machinery, characterized in that: The steps include: A) providing a fluid machine as claimed in claim 2, wherein the first slide valve is disposed between the medium-pressure chamber and the first discharge end, and the second slide valve is disposed between the exhaust port and the second discharge end, and the driving module drives the first screw and the second screw to rotate at a preset speed and a fixed frequency; B) the controller controls the second slide valve to move from between the exhaust port and the second discharge end toward the second suction end; and C) The controller controls the first sliding valve to move from between the medium-pressure chamber and the first discharge end toward the first suction end until the medium-pressure sensor senses that the indoor pressure of the medium-pressure chamber is equal to a preset medium-pressure pressure.

8. The method for operating a fluid machine according to claim 7, characterized in that: It further includes a step E) after step C), in which the controller controls the first slide valve to move toward the first discharge end first, and the second slide valve to move toward the second suction end first, and the drive module is then shut down, and after the first screw and the second screw stop rotating, the first slide valve is set between the medium-pressure chamber and the first discharge end, and the second slide valve is set between the exhaust port and the second discharge end.

9. The method for operating a fluid machine according to claim 8, characterized in that: It further includes a step D) between step C) and step E), in which, when the first slide valve moves to cover the first suction end, and the length of the second slide valve between the second suction end and the second discharge end is equal to or less than 80% of the total length of the second slide valve, and the indoor pressure of the medium-pressure chamber is still not equal to the preset medium-pressure pressure, the controller first controls the first radial notch to be located at a specified position between the first suction end and the first discharge end, and then controls the second slide valve to move toward the second suction end or the second discharge end until the medium-pressure sensor senses that the indoor pressure of the medium-pressure chamber is equal to the preset medium-pressure pressure.

10. The method for operating a fluid machine according to claim 9, characterized in that: In step D), the designated position is calculated based on the pressure of the air inlet and the indoor pressure of the medium-pressure chamber.

11. A method for operating a fluid machinery, characterized in that: The steps include: F) providing a fluid machine as claimed in claim 2, wherein the first slide valve is disposed between the medium-pressure chamber and the first discharge end, and the second slide valve is disposed between the exhaust port and the second discharge end, and the driving module drives the first screw and the second screw to rotate at a preset speed and a fixed frequency; G) the controller controls the first slide valve to move from the first discharge end toward the first suction end until it covers the first suction end, and the second slide valve to move from the second discharge end toward the second suction end until one end of the second slide valve is located between the second suction end and the second discharge end and the other end of the second slide valve is located between the exhaust port and the second discharge end; and H) The controller first controls the first radial notch to be located at a specified position between the first suction end and the first discharge end, and then controls the second slide valve to move toward the second suction end or the second discharge end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to a preset medium pressure.

12. The method for operating a fluid machine according to claim 11, characterized in that: In step H), the length of the second slide valve between the second suction end and the second discharge end is equal to or less than 80% of the total length of the second slide valve, and the designated position is calculated based on the pressure of the suction port and the indoor pressure of the medium pressure chamber.

13. The method for operating a fluid machine according to claim 12, characterized in that: It further includes a step J) after step H), in which the controller controls the first slide valve to move toward the first discharge end first, and the second slide valve to move toward the second suction end first, and the drive module is then shut down, and after the first screw and the second screw stop rotating, the first slide valve is set between the medium-pressure chamber and the first discharge end, and the second slide valve is set between the exhaust port and the second discharge end.

14. The method for operating a fluid machine according to claim 13, characterized in that: It further includes a step I1) between step H) and step J). In step I1), when the length of the second slide valve between the second suction end and the second discharge end is equal to 80% of the total length of the second slide valve, and the indoor pressure of the medium pressure chamber is still higher than the preset medium pressure, the controller controls the second slide valve to continue moving toward the second suction end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to the preset medium pressure.

15. The method for operating a fluid machine according to claim 14, characterized in that: It further includes a step I2) between step H) and step I1). In step I2), when the second slide valve covers the second suction end and the indoor pressure of the medium-pressure chamber is still higher than the preset medium-pressure pressure, the controller controls the first slide valve to move away from the first suction end toward the first discharge end until the medium-pressure sensor senses that the indoor pressure of the medium-pressure chamber is equal to the preset medium-pressure pressure.

16. A method for operating a fluid machinery, characterized in that: The steps include: K) providing a fluid machine as claimed in claim 2, wherein the first radial notch is disposed between the first suction end and the middle of the pair of first screws, and the driving module drives one of the first screws and one of the second screws to start rotating at a low speed; L) the controller controls the second slide valve to move from the second discharge end toward the second suction end until one end of the second slide valve is located between the second suction end and the second discharge end and the other end is located between the exhaust port and the second discharge end, and the driving module drives the first screw and the second screw to continue to increase the speed to a predetermined speed and rotate at a constant speed; and M) The controller first controls the first radial notch to be located at a specified position between the first suction end and the first discharge end, and then controls the second slide valve to move toward the second suction end or the second discharge end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to a preset medium pressure.

17. The method for operating a fluid machine according to claim 16, characterized in that: In step M), the length of the second slide valve position between the second suction end and the second discharge end is equal to or less than 80% of the total length of the second slide valve, and the designated position is calculated based on the pressure of the suction port and the indoor pressure of the medium pressure chamber.

18. The method for operating a fluid machine according to claim 17, characterized in that: It further includes a step O) after step M), in which the driving module first drives one of the first screws and one of the second screws to start slowing down to the low speed rotation, and then the driving module is stopped. After one of the first screws and one of the second screws stop rotating, the first radial notch is set between the first suction end and the middle of the pair of first screws.

19. The method for operating a fluid machine according to claim 18, characterized in that: It further includes a step N1) between step M) and step O). In step N1), when the length of the second slide valve between the second suction end and the second discharge end is equal to 80% of the total length of the second slide valve, and the indoor pressure of the medium pressure chamber is still higher than the preset medium pressure, the controller controls the second slide valve to continue moving toward the second suction end until the medium pressure sensor senses that the indoor pressure of the medium pressure chamber is equal to the preset medium pressure.

20. The method for operating a fluid machine according to claim 19, characterized in that: It further includes a step N2) between step M) and step N1). In step N2), when the second slide valve covers the second suction end and the indoor pressure of the medium-pressure chamber is still higher than the preset medium-pressure pressure, the controller controls the first slide valve to move away from the first suction end toward the first discharge end until the medium-pressure sensor senses that the indoor pressure of the medium-pressure chamber is equal to the preset medium-pressure pressure.

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