Magnetic suspension vacuum pump double-unit parallel connection device and method

Abstract

The invention belongs to the field of application of magnetic suspension vacuum pumps to postprocessing of paper folding machines, and particularly relates to a magnetic suspension vacuum pump double-unit parallel connection device and method.The device comprises a plurality of magnetic suspension vacuum pumps, a plurality of cabinets, a connecting pipeline, an operation panel and a silencer, and the number of the magnetic suspension vacuum pumps and the number of the cabinets are equal; the magnetic suspension vacuum pumps are arranged in the cabinet in a skid-mounted mode, the magnetic suspension vacuum pumps are connected in parallel through the connecting pipeline, and the operation panel is installed on the side face of the cabinet. The silencer is mounted at the upper part of the cabinet and is connected with an outlet pipeline of the magnetic suspension vacuum pump in the cabinet through a corrugated pipe compensator; according to the invention, the two vacuum pumps can fully automatically complete the startup process through communication and a control system of the vacuum pumps, manual operation is not needed, the startup process is simplified, and operation faults of the vacuum pumps caused by misoperation of personnel are also prevented.

Description

Technical Field

[0001] The invention relates to the application of a magnetic levitation vacuum pump in the post-processing field of a paper folding machine, and in particular to a magnetic levitation vacuum pump dual-machine parallel connection device and method. Background Art

[0002] The magnetic levitation vacuum pump is a new high-tech product that has emerged in recent years. Relying on the transformation of the civilian achievements of magnetic levitation flywheels in the field of aerospace satellites, new products have emerged with the maturity of high-speed permanent magnet synchronous motors and the widespread application of high-efficiency three-dimensional flow impellers. It can be used in vacuum dehydration, post-processing of paper folding machines, pneumatic conveying, tail gas recovery and other fields. The magnetic levitation vacuum pump dual-machine parallel system is used in the post-processing field of paper folding machines, and the paper is folded by the suction generated by the vacuum pump. Generally, one vacuum pump drives one paper machine. QRT paper products require a large amount of gas, so two vacuum pumps need to be used in parallel. Because the vacuum pumps are all variable frequency motors, if the frequency difference between the two machines is too large at startup, the gas distribution will be uneven, and one vacuum pump will over-current due to too large a flow rate, while the other will surge due to too small a flow rate.

[0003] Therefore, in order to solve the above-mentioned problems, a magnetic levitation vacuum pump dual-machine parallel connection device and method are specifically proposed. Summary of the invention

[0004] The present invention is aimed at the above-mentioned problems and specifically designs a magnetic levitation vacuum pump dual-machine parallel connection device and method. The present invention can realize the two vacuum pumps through communication and their own control system, and can automatically complete the startup process without the need for human operation, thereby simplifying the startup process and preventing human error operation from causing vacuum pump operation failure.

[0005] To achieve the above-mentioned purpose, the present invention provides a magnetic levitation vacuum pump dual-machine parallel device, comprising: a magnetic levitation vacuum pump, a cabinet, a connecting pipe, an operation panel and a silencer, wherein there are a plurality of magnetic levitation vacuum pumps and cabinets and the number is equal, the magnetic levitation vacuum pump is arranged inside the cabinet in a skid-mounted manner, the magnetic levitation vacuum pump is connected in parallel through the connecting pipe, the operation panel is installed on the side of the cabinet, and the silencer is installed on the upper part of the cabinet and connected to the magnetic levitation vacuum pump inside through a bellows compensator.

[0006] In the above manner, the connecting pipeline connects the magnetic levitation vacuum pumps that need to be connected in parallel, and the parallel connection of the two pumps is controlled by controlling the rotation speed of the magnetic levitation vacuum pumps. Finally, the parallel start of the two pumps is achieved, and then normal operation is performed.

[0007] Furthermore, the connecting pipeline includes a main pipeline and a branch pipeline, one end of the branch pipeline is connected to the magnetic levitation vacuum pump, and the other end of the branch pipeline is connected to the main pipeline.

[0008] Furthermore, the cabinet includes: a pump compartment, a high-voltage compartment and a low-voltage compartment, and the pump compartment, the high-voltage compartment and the low-voltage compartment are independently arranged in the pump compartment.

[0009] Furthermore, the magnetic levitation vacuum pump includes: a motor, a machine head, a control system, a magnetic bearing controller, a circuit breaker and a frequency converter. The motor and the machine head are connected and are both placed in the pump compartment. The machine head is connected to the cabinet and the connecting pipe through the cabinet. The control system and the magnetic bearing controller are arranged in the weak current compartment. The circuit breaker and the frequency converter are both arranged in the strong current compartment. The operation panel and the control system are electrically connected.

[0010] In the above manner, the cabinet is divided into different areas to place different equipment in it, and the three compartments are isolated from each other and do not affect each other.

[0011] Furthermore, the connecting pipeline also includes an elastic joint, and the branch pipeline of the connecting pipeline is connected to the magnetic levitation vacuum pump via the elastic joint.

[0012] In the above manner, elastic joints are used to eliminate pipeline stress and reduce vibration.

[0013] Furthermore, the connecting pipeline also includes a basket filter, which is arranged on the branch pipeline, and an observation plate for observing the interior is installed on the top surface of the basket filter.

[0014] Through the above method, the basket filter is used to filter paper scraps in the air intake pipe to prevent them from entering the motor and causing malfunctions. The upper cover is made of acrylic material, so the internal blockage can be observed, and the quick-open design makes it easy to take out the filter element for cleaning.

[0015] Furthermore, the connecting pipeline also includes an air supply valve and a filter silencer. The air supply valve is installed on the branch pipeline and is located on a side of the basket filter away from the magnetic levitation vacuum pump. The filter silencer is installed on the air supply valve.

[0016] In the above manner, the air supply valve is an electric regulating valve controlled by the vacuum pump control system. In addition to opening during start-stop, when the system detects that surge is about to occur, it will also control the air supply valve to open to prevent the vacuum pump from entering the surge zone.

[0017] The present invention also proposes a method for connecting two magnetic levitation vacuum pumps in parallel, comprising the following steps: Step 1: Install two magnetic levitation vacuum pumps in two cabinets by skid-mounting, and the minimum distance between the two magnetic levitation vacuum pumps 1 is 1000 mm; Step 2: Select a branch pipe of matching size, and install a basket filter and an air supply valve on the branch pipe; Step 3: Connecting the end of the assembled branch pipe close to the basket filter to the head of the magnetic levitation vacuum pump through an elastic joint; Step 4: Connect the branch pipes of the two magnetic levitation vacuum pumps to the main pipe; Step 5: Ensure that the two magnetic levitation vacuum pumps increase their rotation speed synchronously, and the flow rate and vacuum degree remain synchronized; Step 6: During startup, keep the air supply valve of each magnetic levitation vacuum pump fully open. When the speed reaches 60% of the rated speed, the air supply valves are closed to 40% respectively; continue to increase the speed of the magnetic levitation vacuum pump and simultaneously reduce the opening of the air supply valve. When the speed reaches 85%, the air supply valve is fully closed, the startup process is completed, and the two magnetic levitation vacuum pumps start to operate normally.

[0018] Furthermore, in the step 2, a filter silencer is installed on the top of the air supply valve.

[0019] Furthermore, in step five, the control systems of the two magnetic levitation vacuum pumps are electrically connected to each other.

[0020] In summary, the magnetic levitation vacuum pump dual-machine parallel connection device and method of the present invention has the following advantages and beneficial technical effects: 1. The present invention provides a magnetic levitation vacuum pump dual-machine parallel connection device and method, which can realize that two vacuum pumps can communicate with their own control system, and can automatically complete the startup process without the need for human operation, thus simplifying the startup process and preventing human error operation from causing vacuum pump operation failure; 2. The present invention discloses a magnetic levitation vacuum pump dual-machine parallel connection device and method. Since the power of a single device on site is limited (the 380V power supply capacity is small), only a high-voltage motor can be used if the power is large. The high-voltage motor is difficult to design and has a high cost. Replacing the two vacuum pumps with parallel connection can overcome the problem of insufficient flow of a single vacuum pump and avoid excessive power of a single device. 3. The present invention provides a magnetic levitation vacuum pump dual-machine parallel connection device and method. The flow rate of a single vacuum pump can be adjusted within a range of 60-100%. After using two vacuum pumps, the flow rate can be adjusted within a range of 30-100%. The flow rate adjustable range is larger and can be adapted to a wider working range. The number of vacuum pumps can be increased according to the situation to achieve three or four machines in parallel, thereby achieving a larger flow rate range.

[0021] 4. The elastic joint of the dual-machine parallel device of the magnetic levitation vacuum pump of the present invention is used to eliminate pipeline stress and reduce vibration; 5. The basket filter of the magnetic levitation vacuum pump dual-machine parallel device of the present invention is used to filter paper scraps in the air intake pipe to prevent them from entering the motor and causing malfunctions. The upper cover is made of acrylic material, and the internal blockage can be observed. The quick-open design is convenient for taking out the filter element for cleaning; 6. The air supply valve of the magnetic levitation vacuum pump dual-machine parallel device of the present invention is an electric regulating valve, which is controlled by the vacuum pump control system. In addition to opening during start-stop, when the system detects that surge is about to occur, the air supply valve will also be controlled to open to prevent the vacuum pump from entering the surge zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a front view of a magnetic suspension vacuum pump dual-machine parallel device of the present invention; Figure 2 It is a top view of a magnetic suspension vacuum pump dual-machine parallel device of the present invention; Figure 3 The present invention is a schematic diagram of the internal structure of a cabinet of a dual-machine parallel device of magnetic levitation vacuum pumps.

[0023] The reference numerals in the accompanying drawings are: 1-magnetic levitation vacuum pump; 11-motor; 12-head; 13-control system; 14-magnetic bearing controller; 15-circuit breaker; 16-frequency converter; 2-Cabinet: 21-Pump compartment; 22-Power compartment; 23-Weak-current compartment; 3-connecting pipeline; 31-main pipeline; 32-branch pipeline; 33-elastic joint; 34-basket filter; 341-observation panel; 35-air supply valve; 36-filter silencer; 4-operation panel; 5-muffler; 51-bellows compensator. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solution in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions; the described embodiments are part of the embodiments of the present invention, not all of the embodiments; the embodiments described below with reference to the drawings and directional terms are exemplary and are intended to be used to explain the present invention, and cannot be understood as limitations on the present invention; based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The parts and equipment all adopt conventional models in the prior art, and the circuit connections adopt conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. The embodiments of the present invention are described in detail below in conjunction with the drawings: like Figure 1 and Figure 2 As shown, a magnetic levitation vacuum pump dual parallel device includes: a magnetic levitation vacuum pump 1, a cabinet 2, a connecting pipe 3, an operation panel 4 and a muffler 5, there are several magnetic levitation vacuum pumps 1 and cabinets 2, and the number is equal. The magnetic levitation vacuum pump 1 is installed inside the cabinet 2 in a skid-mounted manner, and the cabinet 2 is placed on the ground of the work site. The magnetic levitation vacuum pumps 1 are connected in parallel through the connecting pipe 3, the operation panel 4 is installed on the side of the cabinet 2, and the muffler 5 is installed on the upper part of the cabinet 2 and connected to the internal magnetic levitation vacuum pump 1 through a bellows compensator 51. The connecting pipe 3 connects the magnetic levitation vacuum pumps 1 that need to be connected in parallel, and the parallel connection of the two pumps is controlled by controlling the speed of the magnetic levitation vacuum pump 1, and finally the parallel start of the two pumps is realized, and then normal operation is performed.

[0025] like Figure 1 and Figure 2 As shown, the connecting pipeline 3 includes a main pipeline 31 and a branch pipeline 32 , one end of the branch pipeline 32 is connected to the magnetic levitation vacuum pump 1 , and the other end of the branch pipeline 32 is connected to the main pipeline 31 by welding.

[0026] like Figure 3 As shown, the cabinet 2 includes: a pump compartment 21, a high-voltage compartment 22 and a low-voltage compartment 23. The pump compartment 21, the high-voltage compartment 22 and the low-voltage compartment 23 are independently arranged in the pump compartment. Partitions are connected in the cabinet 2 by bolts, and the partitions divide the space inside the cabinet 2 into compartments.

[0027] like Figure 3 As shown, the magnetic levitation vacuum pump 1 includes: a motor 11, a head 12, a control system 13, a magnetic bearing controller 14, a circuit breaker 15 and a frequency converter 16. The motor 11 and the head 12 are connected and are both placed in a pump compartment 21. The head 12 passes through a cabinet 2 and is connected to a connecting pipe 3. The control system 13 and the magnetic bearing controller 14 are arranged in a weak current compartment 23. The circuit breaker 15 and the frequency converter 16 are both arranged in a strong current compartment 22. The operation panel 4 and the control system 13 are electrically connected.

[0028] like Figure 1 and Figure 2 As shown, the connecting pipeline 3 further includes an elastic joint 33, and the branch pipeline 32 of the connecting pipeline 3 is connected to the magnetic levitation vacuum pump 1 through the elastic joint 33. The elastic joint 33 is used to eliminate pipeline stress and reduce vibration.

[0029] like Figure 1 and Figure 2As shown, the connecting pipe 3 also includes a basket filter 34, which is arranged on the branch pipe 32, and an observation plate 341 for observing the inside is installed on the top surface of the basket filter 34. The observation plate 341 is an acrylic plate. The basket filter 34 is used to filter paper scraps in the air intake pipe to prevent them from entering the motor and causing malfunctions. The upper cover is made of acrylic material, and the internal blockage can be observed. The quick-open design is convenient for taking out the filter element for cleaning.

[0030] like Figure 1 and Figure 2 As shown, the connecting pipeline 3 also includes an air supply valve 35 and a filter silencer 36. The air supply valve 35 is installed on the branch line 32 and is located on the side of the basket filter 34 away from the magnetic levitation vacuum pump 1. The filter silencer 36 is installed on the air supply valve 35. The air supply valve 35 is an electric regulating valve controlled by the vacuum pump control system 13. In addition to opening at start and stop, when the system detects that surge is about to occur, the air supply valve will also be controlled to open to prevent the vacuum pump from entering the surge area.

[0031] A method for connecting two magnetic levitation vacuum pumps in parallel according to the present invention comprises the following steps: Step 1: Install two magnetic levitation vacuum pumps 1 in two cabinets 2 respectively by skid-mounting, and the minimum distance between the two magnetic levitation vacuum pumps 1 is 1000 mm; Step 2: Select a branch pipe 32 of matching size, and install a basket filter 34 and an air supply valve 35 on the branch pipe 32; Step 3: Connect the end of the assembled branch pipe 32 close to the basket filter 34 to the head 12 of the magnetic levitation vacuum pump 1 through the elastic joint 33; Step 4: Connect the branch pipes 32 of the two magnetic levitation vacuum pumps 1 to the main pipe 31; Step 5: Ensure that the two magnetic levitation vacuum pumps 1 increase their rotation speeds synchronously, and that the flow rates and vacuum degrees remain synchronized; Step 6: During startup, keep the air supply valve 35 of each magnetic levitation vacuum pump 1 fully open. When the speed reaches 60% of the rated speed, the air supply valves 35 are closed to 40% respectively. Continue to increase the speed of the magnetic levitation vacuum pump 1 and simultaneously reduce the opening of the air supply valve 35. When the speed reaches 85%, the air supply valve 35 is fully closed. The startup process is completed and the two magnetic levitation vacuum pumps 1 begin to operate normally.

[0032] In step 2, a filter silencer 36 is installed on the top of the air supply valve 35 .

[0033] In step five, the control systems 13 of the two magnetic levitation vacuum pumps 1 are electrically connected to each other.

[0034] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnetic levitation vacuum pump dual-machine parallel device, characterized in that: include: A magnetic levitation vacuum pump (1), a cabinet (2), a connecting pipe (3), an operation panel (4) and a muffler (5), wherein the magnetic levitation vacuum pump (1) and the cabinet (2) are both provided in a plurality and in equal numbers, the magnetic levitation vacuum pump (1) is arranged inside the cabinet (2) in a skid-mounted manner, the magnetic levitation vacuum pump (1) is connected in parallel via the connecting pipe (3), the operation panel (4) is installed on the side of the cabinet (2), and the muffler (5) is installed on the upper part of the cabinet (2) and is connected to the outlet pipe of the magnetic levitation vacuum pump (1) inside via a bellows compensator (51).

2. A magnetic levitation vacuum pump dual-machine parallel device according to claim 1, characterized in that: The connecting pipeline (3) comprises a main pipeline (31) and a branch pipeline (32), one end of the branch pipeline (32) is connected to the magnetic levitation vacuum pump (1), and the other end of the branch pipeline (32) is connected to the main pipeline (31).

3. The magnetic levitation vacuum pump dual-machine parallel device according to claim 1, characterized in that: The cabinet (2) comprises: a pump compartment (21), a strong current compartment (22) and a weak current compartment (23); the pump compartment (21), the strong current compartment (22) and the weak current compartment (23) are independently arranged in the pump compartment.

4. A magnetic levitation vacuum pump dual-machine parallel device according to claim 3, characterized in that: The magnetic levitation vacuum pump (1) comprises: a motor (11), a machine head (12), a control system (13), a magnetic bearing controller (14), a circuit breaker (15) and a frequency converter (16); the motor (11) and the machine head (12) are connected and both are placed in the pump compartment (21); the machine head (12) passes through the cabinet (2) and is connected to the connecting pipe (3); the control system (13) and the magnetic bearing controller (14) are arranged in the weak current compartment (23); the circuit breaker (15) and the frequency converter (16) are both arranged in the strong current compartment (22); and the operation panel (4) and the control system (13) are electrically connected.

5. The magnetic levitation vacuum pump dual-machine parallel device according to claim 2, characterized in that: The connecting pipeline (3) further comprises an elastic joint (33), and the branch pipeline (32) of the connecting pipeline (3) is connected to the magnetic levitation vacuum pump (1) via the elastic joint (33).

6. A magnetic levitation vacuum pump dual-machine parallel device according to claim 2, characterized in that: The connecting pipeline (3) further comprises a basket filter (34), wherein the basket filter (34) is arranged on the branch pipeline (32), and an observation plate (341) for observing the interior is installed on the top surface of the basket filter (34).

7. A magnetic levitation vacuum pump dual-machine parallel device according to claim 6, characterized in that: The connecting pipeline (3) further comprises an air supply valve (35) and a filter silencer (36); the air supply valve (35) is installed on the branch pipeline (32) and is located on a side of the basket filter (34) away from the magnetic levitation vacuum pump (1); and the filter silencer (36) is installed on the air supply valve (35).

8. A method for connecting two magnetic levitation vacuum pumps in parallel, characterized in that: A method for connecting magnetic levitation vacuum pumps in parallel using the magnetic levitation vacuum pump dual-machine parallel connection device according to claim 1 comprises the following steps: Step 1: installing two magnetic levitation vacuum pumps (1) in two cabinets (2) respectively by skid-mounting; Step 2: Select a branch pipeline (32) of matching size, and install a basket filter (34) and an air supply valve (35) on the branch pipeline (32); Step three: connecting the end of the assembled branch pipe (32) close to the basket filter (34) to the head (12) of the magnetic levitation vacuum pump (1) via an elastic joint (33); Step 4: connecting the branch pipes (32) of the two magnetic levitation vacuum pumps (1) to the main pipe (31); Step 5: ensuring that the rotation speeds of the two magnetic levitation vacuum pumps (1) are increased synchronously, while the flow rates and vacuum degrees are kept synchronous; Step 6: During startup, the air supply valve (35) of each magnetic levitation vacuum pump (1) is kept fully open. When the speed reaches 60% of the rated speed, the air supply valve (35) is closed to 40% respectively. The speed of the magnetic levitation vacuum pump (1) is continued to be increased, and the opening of the air supply valve (35) is simultaneously reduced. When the speed reaches 85%, the air supply valve (35) is fully closed. The startup process is completed, and the two magnetic levitation vacuum pumps (1) begin to operate normally.

9. A method for connecting two magnetic levitation vacuum pumps in parallel according to claim 8, characterized in that: In the second step, a filter silencer (36) is installed on the top of the air supply valve (35).

10. A method for connecting two magnetic levitation vacuum pumps in parallel according to claim 8, characterized in that: In step five, the control systems (13) of the two magnetic levitation vacuum pumps (1) are electrically connected to each other.

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