Nitrogen control system of vacuum pump

Abstract

The utility model relates to a nitrogen control system of a vacuum pump, which comprises an upper pump body, a lower pump body, a control module, a nitrogen pipeline, a first control piece, a second control piece, a third control piece, a fourth control piece and a fifth control piece, the control module is connected with the first control part, the second control part, the third control part, the fourth control part and the fifth control part, the nitrogen pipeline comprises a first passage, a second passage and a third passage which are arranged in parallel, the first passage is sequentially provided with the first control part, the second control part and the third control part, and the second passage is provided with the fourth control part. The output end of the fourth control piece is connected between the upper pump body and the lower pump body and communicates with the upper pump body and the lower pump body, a fifth control piece is arranged on the third channel, and the output end of the fifth control piece is connected to an air inlet pipeline of the upper pump body. The device is high in automation degree, convenient in nitrogen pipeline configuration, high in working efficiency and stable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, in particular to a nitrogen control system of a vacuum pump. Background Art

[0002] Currently, in the application field of vacuum pumps, there are many types of process gases used. For example, corrosive gases will cause corrosion to the vacuum pump housing, rotor, etc., affecting the mechanical properties of the vacuum pump and the service life of the vacuum pump. Nitrogen is a stable and harmless gas. Passing nitrogen into the pump can protect the screw pump well, effectively extend its service life and reduce corrosion problems.

[0003] One of the functions of nitrogen in vacuum pumps is nitrogen sealing, which blocks process gases from entering the gearbox and oil tank by introducing a certain flow of nitrogen. Another major use of nitrogen in vacuum pumps is the purging function, which is achieved by introducing nitrogen into the pump, and the purging function can be performed for a period of time before shutting down. However, existing vacuum pumps use relatively simple needle valves, check valves, and flow limiting plates as control means. When adjusting the nitrogen flow, it is necessary to open the sheet metal for manual adjustment, which is inconvenient to construct on site, has low work efficiency, and poor nitrogen flow control, resulting in unstable operation of the vacuum pump. Utility Model Content

[0004] The utility model aims to provide a nitrogen control system for a vacuum pump in view of the defects of the vacuum pump in the prior art, such as inconvenient nitrogen adjustment, low working efficiency and unstable operation of the vacuum pump.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The utility model provides a nitrogen control system for a vacuum pump, which is characterized in that it includes an upper pump body, a lower pump body, a control module, a nitrogen pipeline, a first control component, a second control component, a third control component, a fourth control component, and a fifth control component. The upper pump body is connected to and communicated with the lower pump body, the control module is connected to the first control component, the second control component, the third control component, the fourth control component, and the fifth control component, the nitrogen pipeline includes a first passage, a second passage, and a third passage arranged in parallel, and the first passage is provided with the first control component, the second control component, the third control component, the fourth control component, and the fifth control component in sequence. The second control component and the third control component, the output end of the second control component and the output end of the third control component are respectively connected to and communicated with the bottom of the lower pump body, the output end of the first control component is connected to and communicated with the top of the lower pump body, the second passage is provided with the fourth control component, the output end of the fourth control component is connected between the upper pump body and the lower pump body and is communicated with the upper pump body and the lower pump body, the third passage is provided with the fifth control component, the output end of the fifth control component is connected to the intake pipe of the upper pump body.

[0007] Preferably, the control module is a PLC controller.

[0008] Preferably, the upper pump body and the lower pump body are connected by a connecting pipe, and the output end of the fourth control component is connected to and communicated with the connecting pipe.

[0009] Preferably, the first control component, the second control component, the third control component, the fourth control component, and the fifth control component are all nitrogen solenoid valves.

[0010] Preferably, the first control component, the second control component, the third control component, the fourth control component, and the fifth control component are all electric needle valves.

[0011] Preferably, the nitrogen pipeline further includes a nitrogen storage device, and input ends of the first passage, the second passage, and the third passage are all connected to the nitrogen storage device.

[0012] Preferably, the upper pump body is transmission-connected to the first motor.

[0013] Preferably, the lower pump body is drivingly connected to the second motor.

[0014] Preferably, the control module is connected to the first motor.

[0015] Preferably, the control module is connected to the second motor.

[0016] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0017] The positive progress of the utility model is that the nitrogen sealing and purging functions of the nitrogen control system of the vacuum pump of the utility model are highly automated, the vacuum pump operates stably and has a longer service life, the nitrogen pipeline is conveniently configured, and individual materials can be replaced when the nitrogen pipeline is damaged, which makes it easier to repair on site and has high work efficiency. When dealing with different processes, the opening and installation position of each control component can be adjusted to keep the nitrogen flow of the vacuum pump within a reasonable range, ensuring relatively stable operation of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the structure of the nitrogen control system of the vacuum pump.

[0019] Figure 2 This is a schematic diagram of the connection structure of the control module of the utility model.

[0020] Description of reference numerals:

[0021] Upper pump body 1

[0022] Lower pump body 2

[0023] Control module 3

[0024] Nitrogen pipeline 4

[0025] Input port 40

[0026] First access 41

[0027] Second passage 42

[0028] Third passage 43

[0029] First control element 5

[0030] Second control element 6

[0031] Third control element 7

[0032] Fourth control element 8

[0033] Fifth control element 9

[0034] Intake pipe 10

[0035] Connecting pipe 11

[0036] The first motor 12

[0037] The second motor 13 DETAILED DESCRIPTION

[0038] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0039] The utility model discloses a nitrogen control system for a vacuum pump, such as Figure 1-2 As shown, it includes an upper pump body 1, a lower pump body 2, a control module 3, a nitrogen pipeline 4, a first control component 5, a second control component 6, a third control component 7, a fourth control component 8, and a fifth control component 9. The upper pump body 1 is connected to and communicated with the lower pump body 2, the control module 3 is connected to the first control component 5, the second control component 6, the third control component 7, the fourth control component 8, and the fifth control component 9, the nitrogen pipeline 4 includes a first passage 41, a second passage 42, and a third passage 43 arranged in parallel, and the first passage 41 is sequentially provided with the first control component 5, the second control component 6, the third control component 7, the fourth control component 8, and the fifth control component 9. Control component 6 and third control component 7, the output end of the second control component 6 and the output end of the third control component 7 are respectively connected to and communicated with the bottom of the lower pump body 2, the output end of the first control component 5 is connected to and communicated with the top of the lower pump body 2, a fourth control component 8 is arranged on the second passage 42, the output end of the fourth control component 8 is connected between the upper pump body 1 and the lower pump body 2 and is communicated with the upper pump body 1 and the lower pump body 2, a fifth control component 9 is arranged on the third passage 43, and the output end of the fifth control component 9 is connected to the intake pipe 10 of the upper pump body 1.

[0040] Specifically, a first control component 5, a second control component 6, a third control component 7, a fourth control component 8, a fifth control component 9 and a control module 3 are arranged on the nitrogen pipeline 4, and the opening and closing of each control component is controlled by the control module 3 to achieve the purpose of controlling nitrogen. The output end of the first control component 5 is connected to and communicated with the top of the lower pump body 2 for sealing function. The nitrogen pipeline 4 of this structure is convenient to configure, and the first passage 41, the second passage 42 and the third passage 43 are all connected by pipelines, and are connected to the input port 40 of the nitrogen pipeline 4. The fourth control component 8, the fifth control component 9 are respectively connected to the upper pump body 1, the first control component 5, the second control component 6, the third control component 7, and the three are respectively connected to the lower pump body 2 by pipelines. In the case of damage, individual materials and pipelines can be replaced, which is easier to repair on site. The nitrogen control system of the vacuum pump has a high degree of automation, can adjust the nitrogen flow state of the unit during operation, and can control the opening and closing or intermittent purging function of nitrogen.

[0041] In specific control, we divide the process into three categories: clean, medium harsh, and harsh. The nitrogen control system of the vacuum pump is divided into these three modes.

[0042] Customers can choose the corresponding mode according to the severity of the process:

[0043] Clean mode: after powering on, the first control element 5, the second control element 6 and the third control element 7 are all in the closed state, and the nitrogen flow rate is 0 slm.

[0044] Medium harsh mode: after startup, the first control element 5 and the second control element 6 are turned on, the third control element 7 is turned off, and the nitrogen flow rate is 35-40slm.

[0045] Harsh mode: After startup, the first control element 5, the second control element 6 and the third control element 7 are all in the open state, and the nitrogen flow rate is 55-60slm.

[0046] In the application of nitrogen control system of this vacuum pump, we can also set special functions for cleaning the inside of the pump body for harsh processes, i.e. Harsh mode. Special function: Dilute (purge), nitrogen purge function description, by setting the control module 3, i.e. PLC controller parameters, determine whether the nitrogen solenoid valve is normally open or periodically operated to achieve the purpose of nitrogen purge. In addition, turn on the shutdown purge mode, and after pressing the stop button, the nitrogen purge action will be performed for a period of time, and then the machine will shut down.

[0047] Additional functions: Dilute and Purge. A fifth control component 9 is installed on the air intake line 10, and the control module 3, i.e., the PLC controller, is used to purge and clean the upper pump body 1 and the lower pump body 2. During operation, nitrogen is introduced into the upper pump body 1 from the air intake line 10, and passes through the connecting pipe 11 and the lower pump body 2 in turn, and finally discharged through the exhaust pipe on the lower pump body 2, so as to realize the purge and clean the upper pump body 1 and the lower pump body 2. A fourth control component 8 is installed at the upper and lower pump connection block, i.e., the connecting pipe 11, and similarly, the lower pump body 2 is purged and cleaned separately by the PLC controller. The nitrogen solenoid valve can be replaced by an electric needle valve, and the opening size is controlled by analog input to achieve the effect of adjusting the flow rate. When dealing with different processes, the nitrogen flow rate of the vacuum pump can be kept within a reasonable range by adjusting the opening of the electric needle valve, the opening and closing of the nitrogen solenoid valve, and the installation position of the nitrogen solenoid valve, so as to ensure the relatively stable operation of the vacuum pump.

[0048] In this embodiment, the control module 3 is a PLC controller.

[0049] Specifically, the control module 3 is a PLC controller, which has good programmability, strong reliability, convenient expansion, real-time monitoring, and high safety. It effectively ensures the stable operation of the nitrogen control system of the vacuum pump and realizes various functions of various modes.

[0050] In this embodiment, the upper pump body 1 and the lower pump body 2 are connected by a connecting pipe 11 , and the output end of the fourth control component 8 is connected to and communicates with the connecting pipe 11 .

[0051] Specifically, the upper pump body 1 and the lower pump body 2 are connected by the connecting pipe 11 . When a failure occurs, it is easy to replace the connecting pipe 11 and to overhaul the upper pump body 1 and the lower pump body 2 .

[0052] In this embodiment, the first control component 5 , the second control component 6 , the third control component 7 , the fourth control component 8 , and the fifth control component 9 are all nitrogen solenoid valves.

[0053] Specifically, the setting of the nitrogen solenoid valve can facilitate the control of the PLC controller, and can control the flow, pressure and temperature of nitrogen, etc., ensuring the overall safety and reliability of the nitrogen control system of the vacuum pump.

[0054] In this embodiment, the first control element 5 , the second control element 6 , the third control element 7 , the fourth control element 8 , and the fifth control element 9 are all electric needle valves.

[0055] Specifically, the electric needle valve controls the opening size through analog input to adjust the flow rate, and can finely adjust and control nitrogen, which is beneficial for the system to realize various functions of each mode.

[0056] In this embodiment, the nitrogen pipeline 4 further includes a nitrogen storage device, and the input ends of the first passage 41 , the second passage 42 and the third passage 43 are all connected to the nitrogen storage device.

[0057] Specifically, a nitrogen storage device is also provided in the nitrogen pipeline 4 , which is beneficial for better controlling the stable delivery of nitrogen in combination with the control module 3 .

[0058] In this embodiment, the upper pump body 1 is transmission-connected to the first motor 12 .

[0059] Specifically, the upper pump body 1 is separately connected to the first motor 12 in transmission, thereby improving working efficiency.

[0060] In this embodiment, the lower pump body 2 is transmission-connected to the second motor 13 .

[0061] Specifically, the lower pump body 2 is separately connected to the second motor 13 in transmission, which improves the working efficiency. The first motor 12 and the second motor 13 are used in combination to greatly improve the efficiency of the vacuum pump. In addition, when one of the motors fails, the other motor can continue to work, which is highly flexible.

[0062] In this embodiment, the control module 3 is connected to the first motor 12 .

[0063] Specifically, the control module 3 can also be connected to the first motor 12, and the forward and reverse rotation and speed of the first motor 12 can be controlled by the control module 3, thereby assisting the nitrogen control system of the vacuum pump to realize the functions of each module, improve work efficiency, and adapt to different working occasions.

[0064] In this embodiment, the control module 3 is connected to the second motor 13 .

[0065] Specifically, the control module 3 can also be connected to the second motor 13, and the forward and reverse rotation and speed of the second motor 13 can be controlled by the control module 3, so as to assist the nitrogen control system of the vacuum pump to realize the functions of each module, improve work efficiency, and adapt to different working occasions. The control module 3 can also coordinate and control the first motor 12 and the second motor 13 to achieve more stable operation of the vacuum pump.

[0066] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A nitrogen control system for a vacuum pump, characterized in that: It includes an upper pump body, a lower pump body, a control module, a nitrogen pipeline, a first control component, a second control component, a third control component, a fourth control component, and a fifth control component. The upper pump body is connected to and communicated with the lower pump body. The control module is connected to the first control component, the second control component, the third control component, the fourth control component, and the fifth control component. The nitrogen pipeline includes a first passage, a second passage, and a third passage arranged in parallel. The first passage is sequentially provided with the first control component, the second control component, and the third control component. The output end of the second control component and the output end of the third control component are respectively connected to and communicated with the bottom of the lower pump body. The output end of the first control component is connected to and communicated with the top of the lower pump body. The second passage is provided with the fourth control component. The output end of the fourth control component is connected between the upper pump body and the lower pump body and communicated with the upper pump body and the lower pump body. The third passage is provided with the fifth control component. The output end of the fifth control component is connected to the air intake pipeline of the upper pump body.

2. The nitrogen control system of the vacuum pump according to claim 1, characterized in that: The control module is a PLC controller.

3. The nitrogen control system of the vacuum pump according to claim 1, characterized in that: The upper pump body and the lower pump body are connected by a connecting pipe, and the output end of the fourth control component is connected to and communicated with the connecting pipe.

4. The nitrogen control system for a vacuum pump according to claim 1, characterized in that: The first control component, the second control component, the third control component, the fourth control component, and the fifth control component are all nitrogen solenoid valves.

5. The nitrogen control system for a vacuum pump according to claim 1, characterized in that: The first control component, the second control component, the third control component, the fourth control component, and the fifth control component are all electric needle valves.

6. The nitrogen control system for a vacuum pump according to claim 1, characterized in that: The nitrogen pipeline further includes a nitrogen storage device, and input ends of the first passage, the second passage, and the third passage are all connected to the nitrogen storage device.

7. The nitrogen control system for a vacuum pump according to claim 1, characterized in that: The upper pump body is drivingly connected to the first motor.

8. The nitrogen control system for a vacuum pump according to claim 7, characterized in that: The lower pump body is drivingly connected to the second motor.

9. The nitrogen control system of the vacuum pump according to claim 8, characterized in that: The control module is connected to the first motor.

10. The nitrogen control system for a vacuum pump according to claim 9, characterized in that: The control module is connected to the second motor.

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