TWI795679B - Screw compressor and volume adjustment method - Google Patents

Abstract

A screw compressor and a volume adjustment group are provided. The screw compressor includes a main body, a screw compression group, a liquid storage tank, a volume control group, and a liquid control group. The liquid control group includes a first pipeline, a second pipeline, two control valves, at least one drive motor, and a control module. The first pipeline connects an intake end of the main body and the liquid control group. The second pipeline connects the liquid storage tank and the liquid control group. The two control valves are respectively arranged in the first pipeline and the second pipeline to adjust their inner diameters. Each of the two control valves has a port diameter that is greater than 0. The at least one drive motor is connected to one of the two control valves. The control module is electrically connected to the drive motor. Accordingly, the service life of the screw compressor can be effectively increased.

Description

Screw compression device and volume control method

The invention relates to a compression device and a control method, in particular to a screw type compression device and a volume control method.

The volume adjustment method of the existing screw type compression device is to install two solenoid valves on the oil pressure pipeline, and the two solenoid valves adjust the oil flow of the oil pressure pipeline in a fully open and fully closed manner. Specifically, when it is desired to adjust the volume of the compression chamber of the existing screw-type compression device, the two solenoid valves will switch between the open state and the closed state in turn, so as to adjust the introduction or export of the oil body located in the oil pressure pipeline. The position of the valve block of the existing screw-type compression device is further changed, so as to realize the purpose of volume adjustment.

However, in the process of switching any electromagnetic valve of the conventional screw-type compression device from the fully open state to the fully closed state, the oil body circulating in the oil pressure pipeline will be suddenly blocked and a water hammer effect will occur. The frequent water hammer effect will cause damage to the solenoid valve, and at the same time, it will easily cause the connecting rod that pushes the valve block to break, thereby reducing the service life of the existing screw compression device.

Therefore, the inventor believes that the above-mentioned defects can be improved, Naite devoted himself to research and combined with the application of scientific principles, and finally proposed an invention with reasonable design and effective improvement of the above-mentioned defects.

The technical problem to be solved by the present invention is to provide a rotary compression device and a volume control method to effectively prolong the service life of the screw compression device in view of the shortcomings of the prior art.

The embodiment of the present invention discloses a screw type compression device, comprising: a machine body and a screw compression group, the screw compression group is arranged in the body, the body includes an air inlet; a liquid storage tank is arranged in the body In the body; a volume control group, arranged in the body and corresponding to the position of the screw compression group, the volume control group can adjust the fluid pressure of the screw compression group; and a liquid control group, connected to the The liquid storage tank, the volume control group, and the body, the liquid control group includes: a first pipeline, which communicates with the vicinity of the air inlet end of the body and the volume control group; a second pipeline, which communicates with the liquid storage tank, the first pipeline, and the volume control group; two valve bodies are respectively arranged in the first pipeline and the second pipeline, and the two The valve bodies respectively have a valve port, at least one of the valve bodies can adjust its valve port to adjust the flow through one of the first pipeline and the second pipeline, and the two valve bodies The valve port does not block a liquid in the liquid storage tank from passing through the first pipeline and the second pipeline, and the diameters of the valve ports of the two valve bodies are larger than 0 mm; at least one a drive motor, connected to one of the valve bodies; and a control module, electrically connected to at least one of the drive motors, the control module can send a drive signal to at least one of the drive motors, thereby controlling at least one of the drive motors The drive motor drives the corresponding valve body to adjust its valve port.

The embodiment of the present invention further discloses a volume control method, using the aforementioned spiral compression device, the volume control method includes: implementing a step of receiving or starting a command: the control module receives or starts an adjustment command; implementing a position setting step : the control module uses the adjustment command to set a target position; wherein, the target position is the predetermined movement end position of the adjustment block; implementing a position acquisition step: the position sensing module senses the Adjust the position of the block to obtain a first position signal; implement a first sending step: the position sensing module sends the first position signal to the control module; implement a position comparison step: the The control module compares the first position signal and the target position and generates a drive signal; and implements an inner diameter adjustment step: the control module sends the drive signal to at least one of the drive motors, so that at least One of the drive motors drives the corresponding one of the control valves to adjust its valve port; wherein, the diameters of the valve ports of the two valve bodies are larger than 0 mm.

To sum up, the screw type compression device and the volume control method disclosed in the embodiments of the present invention can drive one of the valve bodies to control its valve port by "at least one of the drive motors, and the valve ports of the two valve bodies The caliber of the valve port is designed to be greater than 0 mm", so that the liquid flowing in the first pipeline or the second pipeline will not have a water hammer effect, thereby effectively greatly improving the spiral compression device service life.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

The following are specific examples to illustrate the implementation of the "screw compression device and volume control method" disclosed in the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. In addition, if it is pointed out below that please refer to the specific drawing or as shown in the specific drawing, it is only used to emphasize the follow-up description. Most of the relevant content mentioned appears in the specific drawing, but not In this ensuing description, reference may be made to only the specific drawings described. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

[first embodiment]

As shown in FIG. 1 to FIG. 3 , it is the first embodiment of the present invention. 1 and 2, the present embodiment discloses a screw compression device 100, the screw compression device 100 includes a body 1, a screw compression group 2, a liquid storage tank 3, a volume control group 4, and a liquid control group5. Specifically, the screw compression group 2 can introduce a fluid R (for example: refrigerant) into the body 1 for compression, and the liquid storage tank 3, the volume control group 4, and the liquid control group 5 are then They can cooperate with each other to regulate the pressure of the fluid R compressed by the screw compression group 2 . The structure of each component of the screw type compression device 100 will be introduced below, and the connection relationship between each component of the screw type compression device 100 will be described in due course.

The body 1 is roughly hollow and has an air inlet 11 and an air outlet 12. The screw compression group 2 is arranged in the body 1 and can be introduced into the fluid R through the air inlet 11 to carry out compressed, and then led out from the outlet port 12. The liquid storage tank 3 is disposed in the body 1, and the liquid storage tank 3 can store a liquid Lq (for example: lubricating oil).

The volume control group 4 is arranged in the body 1 and corresponds to the position of the screw compression group 2 , and the volume control group 4 can adjust the fluid pressure of the screw compression group 2 . The volume control group 4 has a hydraulic chamber 41 , a piston 42 , and a regulating block 43 . Specifically, the hydraulic chamber 41 is arranged in the body 1 and is located on a side adjacent to the gas outlet 12, and a part of the piston member 42, that is, the piston is arranged in the hydraulic chamber 41. One end of the member 42, and the other end of the piston member 42 is provided with the adjustment block 43, the liquid Lq of the reservoir 3 can enter the hydraulic chamber 41 through the liquid control group 5, The liquid Lq pushes the piston member 42, and then drives the adjustment block 43 to change its position. The position change of the adjustment block 43 can adjust the volume of a compression chamber 21 of the screw compression group 2, so as to adjust the The purpose of the fluid pressure compressed by the screw compression group 2.

The liquid control group 5 is connected to the liquid storage tank 3, the volume control group 4, and the body 1, and the liquid control group 5 is used to regulate the liquid Lq in the liquid storage tank 3, the The volume control group 4 and the flow direction and flow rate between the body 1. The liquid control group 5 includes a first pipeline 51 , a second pipeline 52 , two valve bodies 53A, 53B, at least one driving motor 54 , and a control module 55 .

The first pipeline 51 is connected to the vicinity of the intake end 11 of the body 1 and the hydraulic chamber 41 , and the second pipeline 52 is connected to the liquid storage tank 3 and the first pipeline 51 , and the hydraulic chamber 41.

The two valve bodies 53A, 53B are respectively disposed on the first pipeline 51 and the second pipeline 52 . The two valve bodies 53A, 53B respectively have a valve port, at least one of the valve bodies 53A, 53B can adjust its valve port to adjust the flow through the first pipeline 51 and/or the second pipeline 52 flow rate, and at least one of the drive motors 54 is connected to one of the valve bodies to regulate the valve body connected thereto. The number of at least one drive motor 54 in this embodiment is one, and the drive motor 54 is connected to the valve body configured in the first pipeline 51, and defines the valve body as a first valve body 53A, and the valve body configured in the second pipeline 52 is defined as a second valve body 53B, but the present invention is not limited to this embodiment. For example, the driving motor 54 may also be disposed on the second valve body 53B.

Furthermore, the two valve bodies 53A, 53B are respectively a control valve and a throttle valve, the control valve is arranged in the first pipeline 51, and the driving motor 54 is connected to the control valve; That is to say, the first valve body 53A is a control valve, and the first valve body 53A can be driven by the drive motor 54 to adjust its valve port. The throttle valve is arranged in the second pipeline 52 , and the diameter of the valve port of the throttle valve is fixed; that is, the second valve body 53B is a throttle valve with a fixed diameter. In this embodiment, the driving motor 54 can drive the caliber (opening degree) of the valve port of the first valve body 53A, thereby adjusting the flow rate of the liquid Lq flowing through the first pipeline 51 . The second valve body 53B is not provided with any drive motor in this embodiment, and the caliber of the valve port of the second valve body 53B is manually adjusted to a predetermined caliber in advance, and the first The calibers of the valve ports of the valve body 53A and the second valve body 53B are respectively greater than 0 mm, that is, the valve ports of the two valve bodies 53A, 53B do not block the liquid Lq from passing through the The first pipeline 51 and the second pipeline 52 .

In other words, during actual use, the valve port of the second valve body 53B is always fixed to maintain the predetermined diameter, and the driving motor 54 drives the first valve body 53A to adjust its valve opening. The caliber of the ports is increased or decreased, and the calibers of the valve ports of the first valve body 53A and the second valve body 53B are preferably at least kept greater than 0.9 mm. In fact, according to different specifications of the screw compression device 100 and pipeline configuration, the diameters of the valve ports of the first valve body 53A and the second valve body 53B can be set between 1 mm and 15 mm. It should be noted that, in practice, the calibers of the valve ports of the first valve body 53A and the second valve body 53B do not block the flow of the required liquid Lq, and the diameters of the valve ports Ideally, the smaller the caliber, the better.

It should be emphasized that the driving motor 54 adopts a stepping motor or a servo motor, so that the change of the first valve body 53A when adjusting the valve port is a linear change, which can make all the valve ports The diameter of the caliber is gradually changed, so that the flow rate of the liquid Lq flowing through the first valve body 53A does not change too much, and avoids the water hammer effect in the hydraulic chamber 41, thereby extending the piston member 42 and The service life of the adjustment block 43 . To put it another way, any helical compression device that adopts a non-linear change of the valve body is not the helical compression device 100 referred to in this case. For example, a compression device using a solenoid valve.

As shown in FIG. 2 and FIG. 3 , the control module 55 is electrically connected to the drive motor 54 , and the control module 55 can send a drive signal MS to the drive motor 54 to control the drive motor 54 Drive the first valve body 53A to adjust its valve port.

Specifically, the purpose of the driving signal MS may be to increase or decrease the discharge pressure of the fluid R corresponding to the screw compression group 2 of the compression chamber 21, and to change the adjustment block through the piston member 42 43, so as to adjust the volume of the compression chamber 21. As shown in FIG. 2, when the driving signal MS is to increase the discharge pressure of the fluid R, the driving motor 54 adjusts the diameter of the valve port of the first valve body 53A to be larger than that of the second valve body. The diameter of the valve port of the valve body 53B is such that the flow rate of the liquid Lq flowing out of the hydraulic chamber 41 through the first pipeline 51 is greater than that of the liquid Lq flowing into the hydraulic chamber 41 through the second pipeline 52 . The flow rate of the liquid Lq makes the piston member 42 drive the regulating block 43 to move to the gas outlet 12, thereby increasing the discharge pressure of the fluid R in the compression chamber 21. Similarly, as shown in FIG. 1, when the driving signal MS is to reduce the discharge pressure of the fluid R, the driving motor 54 adjusts the diameter of the valve port of the first valve body 53A to be smaller than the The caliber of the valve port of the second valve body 53B is such that the flow rate of the liquid Lq flowing into the hydraulic chamber 41 through the second pipeline 52 is greater than that flowing out of the hydraulic chamber through the first pipeline 51 The flow rate of the liquid Lq at 41 makes the piston member 42 drive the regulating block 43 to move toward the intake end 11 , thereby reducing the discharge pressure of the fluid R in the compression chamber 21 .

[Second embodiment]

As shown in Figure 1 and Figure 4, it is the second embodiment of the present invention, this embodiment is similar to the above-mentioned first embodiment, and the similarities between the two embodiments will not be repeated, and this embodiment is compared with The difference of the above-mentioned first embodiment mainly lies in:

The liquid control group 5 further includes a position sensing module 56, the position sensing module 56 is electrically connected to the control module 55 and arranged on the adjustment block 43, the position sensing module 56 can obtain a position signal LS of the adjusting block 43 and send it to the control module 55, and the control module 55 can adjust the driving signal MS according to the position signal LS.

Specifically, when the driving motor 54 receives the driving signal MS to adjust the first valve body 53A so that the piston member 42 changes the position of the regulating block 43, the position of the regulating block 43 In practice, there may be a risk of excessive error, resulting in the volume of the compression chamber 21 being too large or too small. Therefore, the position sensing module 56 can sense the position of the adjusting block 43, so as to send the position signal LS to the control module 55, and the control module 55 can again according to the position signal LS Another driving signal MS′ is sent to the driving motor 54 to adjust the diameter of the valve port of the first valve body 53A again, further adjusting the position of the regulating block 43 to reduce the error.

[Third embodiment]

As shown in Figure 5 and Figure 6, it is the third embodiment of the present invention, this embodiment is similar to the above-mentioned first embodiment, and the similarities between the two embodiments will not be repeated, and this embodiment is compared with The difference of the above-mentioned first embodiment mainly lies in:

In this embodiment, in response to different design requirements, the two valve bodies 53A, 53B are designed as control valves, the number of at least one driving motor 54 is two, and the two driving motors 54 are respectively connected to two The control valve is used to change the diameters of the valve ports of the first valve body 53A and the second valve body 53B.

Specifically, the driving motor 54 is a stepping motor or a servo motor, so that the changes of the first valve body 53A and the second valve body 53B when adjusting the valve ports are linear changes. That is to say, the drive motor 54 uses a stepless capacity adjustment method to adjust the valve ports of the first valve body 53A and the second valve body 53B, so that the caliber of the valve ports can be adjusted. It is a gradual change without causing the flow rate of the liquid Lq flowing through the first valve body 53A and the second valve body 53B to change too much, so as to avoid the water hammer effect in the hydraulic chamber 41, thereby prolonging the The service life of the piston member 42 and the adjustment block 43 . The actual operation principle of adjusting the volume of the compression chamber 21 is the same as that of the first embodiment, and will not be repeated here.

To further illustrate, the number of driving motors of the liquid control group 5 is two, the two driving motors 54 are respectively connected to the two valve bodies 53A, 53B, and the control module 55 can send two driving signals The MSs are respectively connected to the two drive motors 54, so that the two drive motors 54 can adjust the diameters of the valve ports of the two valve bodies 53A, 53B. That is to say, during actual use of the valve ports of the first valve body 53A and the second valve body 53B, the valve ports of the first valve body 53A and the second valve body 53B The ports can be controlled by the two drive motors 54 respectively, so that the diameter of the valve port is not kept fixed but not closed.

Compared with the first embodiment, the screw compression device 100 of this embodiment has two drive motors 54 that can control the two valve ports at the same time, so that the control of the two valve ports can be effectively and greatly improved. Adjust the accuracy of block 43 position.

[Fourth Embodiment]

As shown in Figure 1 and Figure 7, it is the fourth embodiment of the present invention, this embodiment can be applied to the above-mentioned first embodiment and the third embodiment, this embodiment is similar to the above-mentioned first embodiment and the third embodiment For example, the similarities of the individual embodiments will not be repeated, and the difference between this embodiment and the above-mentioned first embodiment and the third embodiment mainly lies in:

In this embodiment, the spiral compression device 100 is applied to a refrigerant circulation system, such as a refrigerant machine. The spiral compression device 100 is connected to a refrigerant device 200. Specifically, the refrigerant device 200 is a heat The exchanger has a water outlet (not shown in the figure) and a water inlet (not shown in the figure). The liquid control group 5 further includes a temperature sensing module 57 and a pressure sensing module 58 in this embodiment.

The temperature sensing module 57 can detect the temperature of the water outlet or the water inlet and send a temperature signal TS to the control module 55 . The pressure sensing module 58 is arranged in the refrigerant device 200, specifically, the pressure sensing module 58 is arranged near the inlet end 11 and the outlet end 12 of the spiral compression device 100, The pressure sensing module 58 can detect the pressure of the fluid R in the refrigerant device 200 and send a pressure signal PS to the control module 55 . The control module 55 can adjust the driving signal MS according to the pressure signal PS and the temperature signal TS.

That is to say, in this embodiment, the screw compression device 100 can adjust the driving signal MS through the temperature sensing module 57 and the pressure sensing module 58, so that the driving motor 54 can adjust The condition of the first valve body 53A further includes the pressure and/or temperature of the refrigerant device 200 , so that the volume change of the screw type compression device 100 can be adjusted more flexibly according to the needs of users in practice. Of course, the temperature sensing module 57 and the pressure sensing module 58 of the liquid control group 5 can also omit one of the modules according to the needs of the designer, or add a temperature sensing module 57 , the two temperature sensing modules 57 are respectively arranged at the water outlet end and the water inlet end of the refrigerant device 200 .

In addition, as shown in FIG. 2 , this embodiment can be applied to the above-mentioned third embodiment. In this embodiment, the screw compression device 100 can pass through the temperature sensing module 57 and the pressure The sensing module 58 adjusts the driving signal MS so that the conditions for the driving motor 54 to adjust the first valve body 53A and/or the second valve body 53B further include the pressure of the refrigerant device 200 and/or or temperature, so that the volume change of the screw type compression device 100 can be adjusted more flexibly according to the needs of users in practice. Of course, the temperature sensing module 57 and the pressure sensing module 58 of the liquid control group 5 can also omit one of the modules according to the needs of the designer, or add a temperature sensing module 57 , the two temperature sensing modules 57 are respectively arranged at the water outlet end and the water inlet end of the refrigerant device 200 .

[Fifth Embodiment]

As shown in FIG. 1 , FIG. 2 , FIG. 4 , and FIG. 8 , it is one embodiment of the volume control method S10 of the screw type compression device 100 of the present invention. This embodiment is applicable to the screw type compression device 100 of the aforementioned second and third embodiments, so please refer to FIG. 1 , FIG. 2 and FIG. 4 at the same time. This embodiment discloses a volume control method S10, and the volume control method S10 includes step S101 to step S111. It should be noted that, any one of the above-mentioned steps can be omitted or replaced with a reasonable change according to the requirements of the designer. In addition, for the convenience of description, the number of the driving motor 54 in this embodiment is illustrated as one, and it is disposed on the first valve body 53A, but the present invention is not limited to this embodiment. In actual application, the number of driving motors 54 can be two and are respectively arranged on the first valve body 53A and the second valve body 53B.

Implementing a receiving or activating command step S101 : receiving or activating an adjustment command. Specifically, the adjustment command has a boost sub-command and a depressurization sub-command, that is, to increase or decrease the discharge pressure of the fluid R corresponding to the screw compression group 2 of the compression chamber 21; The boost subcommand may be to increase the pressure of the fluid R at a rotor exhaust port of the screw type compression device 100, and the depressurization subcommand may be to decrease the pressure of the fluid R at the rotor exhaust port, thereby passing the The piston member 42 changes the position of the adjusting block 43 . To further illustrate, when the pressure sensing module 58 detects the pressure in the refrigerant device 200 and sends a pressure signal to the control module 55, that is, when the pressure sensing module 58 detects When the pressure of the inlet port 11 and/or the outlet port 12 of the screw type compression device 100 is higher or lower than a set value, the control module 55 starts an adjustment command, that is, the pressure booster Command or decompression sub-command to adjust the position of the piston member 42 and the regulating block 43 , so as to increase or decrease the pressure of the fluid R at the rotor exhaust port of the compression chamber 21 . In addition, in practical applications, the temperature of the water passing through the refrigerant device 200, that is, the temperature of the water outlet or the water inlet of the heat exchanger can be higher or lower than another set value , the control module 55 initiates an adjustment command.

Implement a position setting step S103: the control module 55 uses the adjustment command to set a target position. Furthermore, the target position is the predetermined movement end position of the adjustment block 43 , that is, the volume to be adjusted is achieved by moving the position of the adjustment block 43 .

Implementing a position acquisition step S105 : the position sensing module 56 senses the position of the adjustment block 43 to obtain a first position signal LS.

Implement a first sending step S107 : the position sensing module 56 sends the first position signal LS to the control module 55 .

Implementing a position comparison step S109: the control module 55 compares the first position signal LS and the target position to generate a driving signal MS. Specifically, the control module 55 will perform a process according to the first position signal LS (that is, the current position of the adjustment block 43 ) and the target position (that is, the expected position of the adjustment block 43 ). Analyze and compare, so as to obtain the driving signal MS for commanding the driving motor 54 .

Implement an inner diameter adjustment step S111: the control module 55 sends the driving signal MS to the driving motor 54, so that the driving motor 54 drives the first valve body 53A and/or the second valve body 53B to adjust its valve port; wherein, the diameters of the valve ports of the two valve bodies 53A, 53B are greater than 0 mm.

Specifically, when the adjustment command is the boost sub-command, the drive signal MS causes the drive motor 54 to drive the first valve body 53A and/or the second valve body 53B to adjust its valve and the diameter of the valve port corresponding to the first pipeline 51 is larger than the diameter of the valve port corresponding to the second pipeline 52 . When the adjustment command is the step-down sub-command, the drive signal MS causes the drive motor 54 to drive the first valve body 53A and/or the second valve body 53B to adjust its valve ports, and correspondingly The diameter of the valve port of the first pipeline 51 is smaller than the diameter of the corresponding valve port of the second pipeline 52 .

To further illustrate, when the adjustment command is the boost sub-command, the driving signal MS is to increase the pressure of the fluid R, and the driving signal MS causes the driving motor 54 to move the first valve body The diameter of the valve port of 53A is adjusted to be larger than the diameter of the valve port of the second valve body 53B, so that the flow rate of the liquid Lq flowing out of the hydraulic chamber 41 through the first pipeline 51 is greater than that through the The flow rate of the liquid Lq flowing into the hydraulic chamber 41 from the second pipeline 52 makes the piston member 42 drive the regulating block 43 to move toward the gas outlet 12 , thereby making all the compression chambers 21 The discharge pressure of the fluid R corresponding to the screw compression group 2 increases.

Similarly, as shown in FIG. 1 , when the adjustment command is the sub-command for reducing pressure, the driving signal MS is to reduce the pressure of the fluid R, and the driving signal MS causes the driving motor 54 to reduce the pressure. The diameter of the valve port of the first valve body 53A is adjusted to be smaller than the diameter of the valve port of the second valve body 53B, so that the liquid flowing into the hydraulic chamber 41 through the second pipeline 52 The flow rate of Lq is greater than the flow rate of the liquid Lq flowing out of the hydraulic chamber 41 through the first pipeline 51, so that the piston member 42 drives the regulating block 43 to move toward the air inlet port 11, thereby making the The pressure of the fluid R corresponding to the screw compression group 2 in the compression chamber 21 decreases.

That is to say, when the fluid R is to be pressurized, the valve port of the first valve body 53A is larger than the valve port of the second valve body 53B. When the fluid R is to be decompressed, the valve port of the first valve body 53A will be smaller than the valve port of the second valve body 53B, but the two valve ports of the two cases Caliber is not equal to 0.

[Sixth embodiment]

As shown in Fig. 1, Fig. 4, and Fig. 9, it is the sixth embodiment of the present invention. This embodiment is similar to the above-mentioned fifth embodiment, and the similarities between the two embodiments will not be repeated here. The difference between this example and the above-mentioned fifth embodiment mainly lies in that: the volume control method S10 ′ further includes steps S113 to S121 .

Specifically, when the position of the regulating block 43 is adjusted by the change of the flow direction of the liquid Lq located in the hydraulic chamber 41 , there may be an error in the position of the regulating block 43 . In order to reduce the position error of the regulating block 43, the volume control method has the following steps:

Implementing a position confirmation step S113 : the position sensing module 56 senses the current position of the adjustment block 43 to obtain a second position signal LS. That is to say, the second position signal LS is the adjusted position of the regulating block 43 after being pushed by the liquid Lq.

Implement a second sending step S115 : the position sensing module 56 sends the second position signal LS to the control module 55 .

Implement a judging step S117: the control module 55 judges whether the adjusting block 43 is located at the target position by using the second position signal LS. If not, execute the next step S119; if yes, execute a waiting step S118: the control module 55 waits for the next adjustment command.

Specifically, when the distance between the second position signal LS and the target position differs by more than an error tolerance value, the control module 55 determines that the position represented by the second position signal LS is not located at the target position. position, and then execute the next step S119.

When the distance difference between the second position signal LS and the target position is smaller than the error tolerance, the control module 55 determines that the position represented by the second position signal LS is located at the target position, and Then execute the waiting step S118, that is, prepare to continue executing the receiving command step S101. It should be noted that the tolerance of the error in this embodiment is preferably no more than 3 mm, but the present invention is not limited to this embodiment. For example, the tolerance value of the error can be adjusted according to the actual situation in practice.

Implementing an adjustment signal generating step S119 : the control module 55 compares the second position signal LS and the target position to generate a position adjustment signal.

Implement a correction step S121: the control module 55 sends the position adjustment signal to the drive motor 54, so that the drive motor 54 drives the first valve body 53A and/or the second valve body 53B to adjust its valve port. Specifically, the position adjustment signal is used to command the drive motor 54 so that the position of the adjustment block 43 can be moved by the change of the flow direction of the liquid Lq located in the hydraulic chamber 41, and the adjustment The distance between the position of block 43 and said target position is smaller than said error tolerance value.

To further illustrate, in the judging step S117, when an error tolerance between the position represented by the second position signal LS and the target position is greater than 5 millimeters, in the adjustment signal generating step S119 And in the correction step S121, the position adjustment signal generated by the control module 55 will roughly adjust the driving motor 54, that is, greatly adjust the number of rotations of the driving motor 54 . When an error tolerance between the position represented by the second position signal LS and the target position is within 3-5 millimeters, in the adjustment signal generation step S119 and the correction step S121, the The position adjustment signal generated by the control module 55 will fine-tune the driving motor 54 , that is, adjust the number of rotations of the driving motor 54 in a small range.

By repeatedly detecting and adjusting the distance error between the second position signal LS and the target position, until the error allowable value of the distance difference between the second position signal LS and the target position does not exceed 3 mm In centimeters, the control module 55 determines that the position represented by the second position signal LS is located at the target position, and then the control module 55 executes the waiting step S118. In practice, in order to improve the control accuracy of the adjusting block 43 , it is further required that the distance between the second position signal LS and the target position differ by an error tolerance of no more than 1 mm.

In addition, in order to avoid the water hammer effect caused by the repeated adjustment of the adjustment block 43, a delay time step S123 can be implemented after the correction step, so that the control module 55 counts a delay time, and then continues The position confirmation step S113 is implemented to obtain the adjusted second position signal, so as to avoid adjusting the adjustment block 43 too frequently due to the tight detection and adjustment procedures. In practical application, the delay time is generally set to be more than 1 minute, for example, preferably can be set to 3 minutes.

[Technical effects of the embodiments of the present invention]

To sum up, the screw type compression device 100 and the volume control method disclosed in the embodiment of the present invention can control its valve port by "at least one of the drive motors 54 driving one of the valve bodies 53A, 53B, and the two The valve ports of the valve body 53A, 53B are designed with a diameter larger than 0 mm", so that the fluid flowing in the first pipeline 51, the second pipeline 52 and the hydraulic chamber 41 The liquid Lq does not have a water hammer effect, thereby effectively greatly increasing the service life of the screw compression device 100 .

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

100: screw compression device 1: Body 11: Intake end 12: Outlet end 2: screw compression group 21: Compression chamber 3: Reservoir 4: Volume control group 41: Hydraulic chamber 42:Piston parts 43: Adjustment block 5: Liquid control group 51: The first pipeline 52: Second pipeline 53A: the first valve body 53B: Second valve body 54: Drive motor 55:Control module 56:Position sensing module 57:Temperature sensing module 58:Pressure sensing module 200: Refrigerant device R: Fluid Lq: liquid LS: position signal MS, MS': driving signal TS: temperature signal PS: pressure signal S101～S123: Steps S10, S10': method

FIG. 1 is a schematic cross-sectional view of the liquid flowing toward the hydraulic chamber in the screw compression device according to the first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of the liquid in the screw compression device according to the first embodiment of the present invention when it flows out from the hydraulic chamber.

FIG. 3 is a functional block diagram of a liquid control group of the screw compression device according to the first embodiment of the present invention.

FIG. 4 is a functional block diagram of a fluid control group of a screw compression device according to a second embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a screw compression device according to a second embodiment of the present invention.

FIG. 6 is a functional block diagram of a fluid control group of a screw compression device according to a third embodiment of the present invention.

FIG. 7 is a functional block diagram of a screw compression device connected to a refrigerant device according to a fourth embodiment of the present invention.

FIG. 8 is a schematic flowchart of the steps of the volume control method according to the fifth embodiment of the present invention.

FIG. 9 is a schematic flowchart of the steps of the volume control method according to the sixth embodiment of the present invention.

100: screw compression device

1: Body

11: Intake end

12: Outlet end

2: screw compression group

21: Compression chamber

3: Reservoir

4: Volume control group

41: Hydraulic chamber

42:Piston parts

43: Adjustment block

5: Liquid control group

51: The first pipeline

52: Second pipeline

53A: the first valve body

53B: Second valve body

54: Drive motor

R: Fluid

Lq: liquid

Claims (15)

A screw compression device, comprising: a body and a screw compression group, the screw compression group is arranged in the body, and the body includes an air inlet; a liquid storage tank is arranged in the body; A volume control group, arranged in the body and corresponding to the position of the screw compression group, the volume control group can adjust the fluid pressure of the screw compression group; and a liquid control group, connected to the liquid storage tank, the The volume control group and the body, the liquid control group includes: a first pipeline, connected to the vicinity of the air intake end of the body and the volume control group; a second pipeline, connected to the The liquid storage tank, the first pipeline, and the volume control group; a first valve body and a second valve body, respectively arranged in the first pipeline and the second pipeline, the The first valve body and the second valve body respectively have a valve port, and at least one of the first valve body and the second valve body can adjust its valve port to adjust the flow through the first pipeline and the valve port. The flow rate of at least one of the second pipelines, the valve ports of the first valve body and the second valve body do not block a liquid in the storage tank from passing through the first pipeline and the The second pipeline, and the diameter of the valve port of the first valve body and the second valve body is greater than 0 mm; at least one driving motor is connected to the first valve body and the second valve body One of the valve bodies; a control module electrically connected to at least one of the driving motors, the control module can send a driving signal to at least one of the driving motors, thereby controlling at least one of the driving motors to drive the corresponding said valve port; and A position sensing module, electrically connected to the control module and set on an adjustment block of the liquid control group, the position sensing module can obtain a position signal of the adjustment block and send it to the The control module, the control module can adjust the driving signal according to the position signal; wherein, when the driving signal is to reduce the discharge pressure of the fluid, the driving motor will drive the first valve body The caliber of the valve port is adjusted to be smaller than the caliber of the valve port of the second valve body, so that the flow of the liquid flowing into a hydraulic chamber of the liquid control group through the second pipeline is greater than that through the The flow rate of the liquid flowing out of the hydraulic chamber from the first pipeline makes a piston of the liquid control group drive the regulating block to move toward the intake end; wherein, when the driving signal is When increasing the discharge pressure of the fluid, the driving motor adjusts the diameter of the valve port of the first valve body to be larger than the diameter of the valve port of the second valve body, so that The flow rate of the liquid flowing out of the hydraulic chamber through the pipeline is greater than the flow rate of the liquid flowing into the hydraulic chamber through the second pipeline, so that the piston member drives the regulating block to move toward the air outlet . The screw compression device according to claim 1, wherein the first valve body and the second valve body are respectively a control valve and a throttle valve, and the control valve is arranged in the first pipeline, The drive motor is connected to the control valve, the throttle valve is arranged in the second pipeline, and the diameter of the valve port of the throttle valve is fixed. The screw compression device according to claim 1, wherein the first valve body and the second valve body are control valves, the number of at least one driving motor is two, and the two driving motors are respectively Connect the two control valves. The screw compression device according to claim 1, wherein at least one of the driving motors is a stepping motor or a servo motor. The screw compression device according to claim 1, wherein the diameters of the two valve ports are greater than 0.9 mm. The screw compression device according to claim 1, wherein the diameters of the two valve ports are between 1 mm and 15 mm. The screw compression device according to claim 1, wherein the liquid control group further includes a temperature sensing module, and the temperature sensing module is arranged on a refrigerant device connected to the screw compression device. A water outlet or a water inlet, the temperature sensing module can detect the temperature of the water outlet or the water inlet and send a temperature signal to the control module, and the control module can adjust the drive signal. The screw compression device according to claim 1, wherein the liquid control group further includes a pressure sensing module, and the pressure sensing module is arranged in a refrigerant device connected to the screw compression device, The pressure sensing module can detect the pressure in the refrigerant device and send a pressure signal to the control module, and the control module can adjust the driving signal according to the pressure signal. A volume control method, using the spiral compression device of claim 1, the volume control method includes: implementing a step of receiving or starting a command: the control module receives or starts an adjustment command; implementing a position setting step: The control module uses the adjustment command to set determining a target position; wherein, the target position is a predetermined movement end position of the adjustment block; implementing a position obtaining step: the position sensing module senses the position of the adjustment block to obtain a first position signal; implement a first sending step: the position sensing module sends the first position signal to the control module; implement a position comparison step: the control module compares the first position signal and the target position and generate a driving signal; and implement an inner diameter adjustment step: the control module sends the driving signal to at least one of the driving motors, so that at least one of the driving motors drives one of the corresponding The valve port of the control valve is adjusted; wherein, the diameters of the valve ports of the first valve body and the second valve body are larger than 0 mm. The volume control method as described in claim 9, after the inner diameter adjusting step, further includes: implementing a position confirmation step: the position sensing module senses the current position of the adjustment block to obtain a second position signal; implement a second sending step: the position sensing module sends the second position signal to the control module; implement a judging step: the control module judges the position by using the second position signal Whether the adjustment block is located at the target position; if not, execute the next step; implement an adjustment signal generation step: the control module compares the second position signal with the target position and generates a position adjustment signal; Implementing a correction step: the control module sends the position adjustment signal to at least one of the driving motors, so that at least one of the driving motors drives one of the control valves to adjust its valve port. The volume control method according to claim 10, wherein, in the judging step, if an error tolerance between the position represented by the second position signal and the target position is less than 3mm, then it is determined that the The adjustment block is located at the target position. The volume control method according to claim 10, wherein, in the judging step, an error tolerance between the position represented by the second position signal and the target position is greater than 5 millimeters; In the adjusting signal generating step and the correcting step, the position adjusting signal generated by the control module can greatly adjust the number of rotations of the driving motor. The volume control method according to claim 10, wherein, in the judging step, an error tolerance between the position represented by the second position signal and the target position is between 3 mm and 5 mm, In the adjustment signal generation step and the correction step, the position adjustment signal generated by the control module will adjust the number of rotations of the driving motor in a small range. The volume control method according to claim 9, wherein the adjustment command includes a boost subcommand and a pressure drop subcommand; if the adjustment command is the boost subcommand, the driving signal is at least One of the drive motors drives the corresponding control valve to adjust its valve port, and the diameter of the valve port corresponding to the first pipeline is larger than the diameter of the valve port corresponding to the second pipeline; When the adjustment command is the sub-command for pressure reduction, the driving signal causes at least one of the drive motors to drive the corresponding control valve to adjust its valve port, and the diameter of the valve port corresponding to the first pipeline smaller than the diameter of the valve port corresponding to the second pipeline. The volume control method as described in claim 10, wherein, after implementing the correcting step, it further includes: implementing a delay time step: after the control module counts a delay time, the position confirmation step is continuously implemented, to obtain the second position signal.

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