CN114320918A

CN114320918A - Variable frequency vacuum pump system

Info

Publication number: CN114320918A
Application number: CN202111578708.1A
Authority: CN
Inventors: 周恩华
Original assignee: Chengdu Huatebang Technology Co ltd
Current assignee: Chengdu Huatebang Technology Co ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-04-12

Abstract

The invention discloses a variable frequency vacuum pump system, and belongs to the technical field of vacuum pumps. A variable frequency vacuum pump system comprising: the pump body assembly, the motor assembly, the frequency converter and the PLC module are respectively arranged in the shell; the motor assembly is respectively connected with the pump body assembly and the frequency converter, and the pump body assembly, the motor assembly and the frequency converter are respectively in communication connection with the PLC module. According to the invention, the frequency converter is arranged in the vacuum pump system, and when the vacuum degree is insufficient, the pump body assembly runs at full load; when the vacuum pump system reaches a proper vacuum condition, the frequency converter drives the motor to reduce the rotating speed, so that the pump body assembly can maintain the requirement of the lowest vacuum degree, and the vacuum pump system can maintain the operation with low energy consumption when the vacuum condition is reached.

Description

Variable frequency vacuum pump system

Technical Field

The invention relates to the technical field of vacuum pumps, in particular to a variable-frequency vacuum pump system.

Background

The vacuum pump refers to a device or equipment for obtaining vacuum by pumping a pumped container by using a mechanical, physical, chemical or physicochemical method. In general, a vacuum pump is a device for improving, generating and maintaining a vacuum in a certain closed space by various methods. The general vacuum pump is not connected with the frequency converter for working, or the frequency converter is only used for improving the rotating speed or the working efficiency, and the working state of the vacuum pump is a fixed frequency. Therefore, the operating frequency of the vacuum pump system in the prior art is fixed, so that the energy loss is not low.

Disclosure of Invention

The invention aims to provide a variable-frequency vacuum pump system to solve the problems that the working frequency of the conventional vacuum pump system is fixed and the energy loss is not low.

The technical scheme for solving the technical problems is as follows:

a variable frequency vacuum pump system comprising: the pump body assembly, the motor assembly, the frequency converter and the PLC module are respectively arranged in the shell;

the motor assembly is respectively connected with the pump body assembly and the frequency converter, and the pump body assembly, the motor assembly and the frequency converter are respectively in communication connection with the PLC module.

According to the invention, the frequency converter is arranged in the vacuum pump system, and when the vacuum degree is insufficient, the pump body assembly runs at full load; when the vacuum pump system reaches a proper vacuum condition, the frequency converter drives the motor to reduce the rotating speed, so that the pump body assembly can maintain the requirement of the lowest vacuum degree, and the vacuum pump system can maintain the operation with low energy consumption when the vacuum condition is reached.

Further, the pump body assembly includes: single-stage roots pump and multistage roots pump that are connected, motor element includes: the first motor of being connected with single-stage lobe pump and the second motor of being connected with multistage lobe pump, first motor and second motor are connected with the converter respectively, and single-stage lobe pump, multistage lobe pump, first motor and second motor respectively with PLC module communication connection.

The single-stage roots pump and the multi-stage roots pump are respectively connected with the corresponding motor and the corresponding frequency converter, so that the whole system can run in a grading way, and the energy consumption is saved under the condition of meeting the requirement of vacuum degree.

Furthermore, a cooling water circulating pipe is further arranged inside the shell, and the first motor, the second motor and the frequency converter are respectively connected with the cooling water circulating pipe.

The cooling water circulation pipe is arranged, so that cooling water circulation is convenient to feed, and the motor assembly and the frequency converter are cooled.

Furthermore, the single-stage roots pump is connected with an air inlet pipe penetrating through the side wall of the shell, a vacuum gauge is arranged on the air inlet pipe, and the vacuum gauge is in communication connection with the PLC module.

The air inlet pipe is convenient for air inlet of the pump body assembly during working, and the vacuum gauge is used for monitoring the vacuum degree of air in the air inlet pipe in real time.

Further, the multistage roots pump is connected with an exhaust pipe penetrating through the side wall of the housing.

The exhaust pipe is arranged for discharging dust sucked into the pump body, so that the phenomenon that an inner rotor of the pump is blocked due to excessive accumulation of the dust is avoided.

Furthermore, the pump body assembly is connected with a nitrogen circulating pipe, an electromagnetic valve is arranged on the nitrogen circulating pipe, and the electromagnetic valve is in communication connection with the PLC module.

The nitrogen circulating pipe is arranged to facilitate the introduction of nitrogen into the pump body for diluting dust, so that excessive dust accumulation in the pump body is prevented.

Furthermore, the multi-stage roots pump comprises a plurality of roots pumps connected in parallel, and each roots pump is connected with a nitrogen circulating pipe.

Further, the bottom of the shell is connected with a roller.

The shell is conveniently driven to move through the rollers, and the use convenience of the whole device is improved.

The invention has the following beneficial effects:

Drawings

FIG. 1 is a schematic diagram of a variable frequency vacuum pump system according to the present invention.

In the figure: 10-a housing; 11-a roller; 20-a pump body assembly; 21-single-stage roots pump; 22-multi-stage roots pump; 23-an air inlet pipe; 24-a vacuum gauge; 25-an exhaust pipe; 30-a motor assembly; 31-a first motor; 32-a second motor; 40-a frequency converter; 50-a PLC module; 60-cooling water circulation pipe; 70-nitrogen gas circulation pipe; 71-solenoid valve.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

Examples

Referring to fig. 1, a variable frequency vacuum pump system, comprising: the pump body assembly comprises a shell 10, and a pump body assembly 20, a motor assembly 30, a frequency converter 40 and a PLC module 50 which are respectively arranged in the shell 10.

The pump body assembly 20 includes: the vacuum gas monitoring device comprises a single-stage roots pump 21 and a multi-stage roots pump 22 which are connected, wherein an air inlet pipe 23 penetrating through the side wall of the shell 10 is arranged on the single-stage roots pump 21, and a vacuum gauge 24 is arranged on the air inlet pipe 23 and used for carrying out vacuum monitoring on gas sucked by the air inlet pipe 23. The multistage roots pump 22 is connected with an exhaust pipe 25 penetrating through the side wall of the shell 10, and is used for discharging dust pumped by the pump body during working, so that the phenomenon that the inner rotor of the pump is blocked due to excessive dust accumulation in the pump body is avoided. The single-stage roots pump 21, the multi-stage roots pump 22 and the vacuum gauge 24 are respectively in communication connection with the PLC module 50, and the vacuum gauge 24 sends an electric signal to the PLC module 50 when the vacuum condition changes, so that the working state of the pump body assembly 20 is adjusted through the PLC module 50.

The motor assembly 30 includes: the first motor 31 that is connected with single-stage roots pump 21 and the second motor 32 that is connected with multistage roots pump 22, first motor 31 and second motor 32 still are connected with converter 40 respectively, and the quantity of converter 40 is two, is used for cooperating with motor element 30 respectively and realizes the frequency conversion regulation.

The inside of casing 10 is provided with cooling water circulating pipe 60, and cooling water circulating pipe 60 is connected with converter 40, first motor 31 and second motor 32 respectively, conveniently lets in cooling water circulation to carry out cooling to motor element 30 and converter 40, avoid its long-term work to take place overheated phenomenon.

The inside of the casing 10 is provided with a nitrogen circulation pipe 70, and the nitrogen circulation pipe 70 penetrates the sidewall of the casing 10 and is connected to the multistage roots pump 22. The multistage roots pump 22 includes a plurality of roots pumps connected in parallel, and a nitrogen circulation pipe 70 is connected to each roots pump. The nitrogen circulating pipe 70 is arranged to facilitate the introduction of nitrogen into the pump body for diluting dust, thereby preventing the excessive accumulation of dust in the pump body. The nitrogen circulating pipe 70 is also provided with an electromagnetic valve 71 which is in communication connection with the PLC module 50, and intelligent control over the nitrogen circulating pipe 70 can be conveniently realized through on-off of the electromagnetic valve 71.

Still be connected with multiunit gyro wheel 11 in the bottom of casing 10, conveniently drive casing 10 through gyro wheel 11 and remove to increase the use convenience of whole device.

The vacuum pump system of the invention is set to work at a certain frequency under a normal working mode. The nitrogen gas circulating pipe 70 is filled with nitrogen gas to purge the interior of the pump body. Under the condition that the required vacuum degree is not achieved, the pump body assembly 20 runs at full load. When the vacuum degree condition is reached, the vacuum gauge 24 detects the vacuum degree in real time and sends an electric signal to the PLC module 50, the PLC module 50 sends an instruction to the frequency converter 40 after receiving the signal, so that the frequency converter 40 automatically reduces the rotating speed, the motor assembly 30 and the pump body assembly 20 reduce the workload, and the requirement of the lowest vacuum degree is met. The PLC module 50 simultaneously sends a signal to the solenoid valve 71, so that the solenoid valve 71 closes and the purging of the interior of the pump by the nitrogen is disconnected.

When the main machine platform is used for processing, gas enters the air inlet pipe 23, the vacuum gauge 24 transmits an electric signal to the PLC module 50 after detecting the gas, and the PLC module 50 transmits the signal to the frequency converter 40, so that the working load of the motor assembly 30 and the pump body assembly 20 is improved, and the required vacuum regulation is quickly achieved. Meanwhile, the PLC transmits a signal to the electromagnetic valve 71, so that the electromagnetic valve 71 is opened, nitrogen is conveniently introduced to blow the interior of the pump body, dust and gas are diluted and discharged through the exhaust pipe 25, and the dust and the gas are prevented from settling in the pump body.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A variable frequency vacuum pump system, comprising: the pump comprises a shell (10), and a pump body assembly (20), a motor assembly (30), a frequency converter (40) and a PLC module (50) which are respectively arranged in the shell (10);

the motor assembly (30) is respectively connected with the pump body assembly (20) and the frequency converter (40), and the pump body assembly (20), the motor assembly (30) and the frequency converter (40) are respectively in communication connection with the PLC module (50).

2. The variable frequency vacuum pump system of claim 1, wherein the pump body assembly (20) comprises: a single-stage roots pump (21) and a multi-stage roots pump (22) connected, the motor assembly (30) comprising: the single-stage roots pump comprises a first motor (31) connected with the single-stage roots pump (21) and a second motor (32) connected with the multi-stage roots pump (22), wherein the first motor (31) and the second motor (32) are respectively connected with a frequency converter (40), and the single-stage roots pump (21), the multi-stage roots pump (22), the first motor (31) and the second motor (32) are respectively in communication connection with the PLC module (50).

3. The variable frequency vacuum pump system according to claim 2, wherein a cooling water circulation pipe (50) is further provided inside the housing (10), and the first motor (31), the second motor (32) and the frequency converter (40) are respectively connected to the cooling water circulation pipe (60).

4. The variable frequency vacuum pump system according to claim 2, wherein an intake pipe (23) extending through a side wall of the housing (10) is connected to the single-stage roots pump (21), a vacuum gauge (24) is provided on the intake pipe (23), and the vacuum gauge (24) is communicatively connected to the PLC module (50).

5. The variable frequency vacuum pump system as claimed in claim 4, wherein an exhaust tube (25) is connected to the multistage roots pump (22) through a sidewall of the housing (10).

6. The variable frequency vacuum pump system according to any one of claims 1 to 5, wherein a nitrogen circulation pipe (70) is connected to the pump body assembly (20), a solenoid valve (71) is disposed on the nitrogen circulation pipe (70), and the solenoid valve (71) is in communication connection with the PLC module (50).

7. The variable frequency vacuum pump system as claimed in claim 6, wherein the multistage roots pump (22) comprises a plurality of roots pumps connected in parallel, each roots pump being connected to the nitrogen circulation tube (70).

8. A variable frequency vacuum pump system according to any of claims 1 to 5, characterized in that rollers (11) are connected to the bottom of the housing (10).