High-precision positive and negative pressure control device

Abstract

The utility model discloses a high-precision positive and negative pressure control device which comprises a penetrating type lead screw motor, a cylinder body, a piston, a lead screw guide mechanism, a pressure sensor, a positive pressure unit and a negative pressure unit. One end of a lead screw part of the penetrating type lead screw motor is connected with the piston, and the other end of the lead screw part of the penetrating type lead screw motor is connected with the lead screw guide mechanism; the penetrating type lead screw motor drives the piston to linearly move left and right in the cylinder body. One end of the cylinder body is connected with a pressure sensor, a positive pressure unit and a negative pressure unit. The through type screw rod motor is connected with the piston, and the cylinder body is connected with the pressure sensor, the positive pressure unit and the negative pressure unit, so that the length of the whole device can be effectively reduced, and the accurate position of the piston can be realized to control the air pressure; the technical problems that an air pressure control device in the prior art is complex in structure and low in positive and negative pressure control precision are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air pressure control, in particular to a high-precision positive and negative pressure control device. Background Technique

[0002] During the long-term live operation of transformers in the power system, due to the influence of multiple factors such as strong voltage, insulating substances such as oil and insulating paper may crack and decompose, generating characteristic gases such as acetylene, methane, and hydrogen, which affect the insulation performance. These characteristic gases are dissolved in the transformer oil, and gas separation needs to be carried out on the transformer oil, and the performance of the transformer is judged by detecting the gas concentration. Most of the current oil-gas separation technologies rely on a negative pressure environment, and the formation and control of negative pressure are also key parts of the pneumatic control system.

[0003] Chinese Patent CN112283073B discloses a positive and negative pressure generating device, including a chassis, a compressed air system, a negative pressure suction system, and a control system. The compressed air system, the negative pressure suction system, and the control system are arranged inside the chassis; the compressed air system constitutes the first chamber of the positive and negative pressure generating device; the negative pressure suction system constitutes the second chamber of the positive and negative pressure generating device, and the control system constitutes the third chamber of the positive and negative pressure generating device. The control system is electrically connected to the compressed air system and / or the negative pressure suction system respectively. The above solution generates negative pressure by sucking air through the negative pressure suction system, and the control system performs positive pressure and / or negative pressure control.

[0004] However, the above solution has a complex structure, and the systems for providing positive pressure and negative pressure are independently and separately arranged, which cannot meet the requirement of precise control of positive and negative pressure in oil-gas separation. Therefore, there is an urgent need to design a high-precision positive and negative pressure control device to solve the problems existing in the above prior art. Content of the Utility Model

[0005] The purpose of the utility model is to solve the technical problems of the complex structure of the air pressure control device in the prior art and the low precision of positive and negative pressure control.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a high-precision positive and negative pressure control device, including a through-type lead screw motor, a cylinder block, a piston, a lead screw guiding mechanism, a pressure sensor, a positive pressure unit, and a negative pressure unit;

[0008] One end of the lead screw part of the through-type lead screw motor is connected to the piston, and the other end is connected to the lead screw guiding mechanism;

[0009] The through-type lead screw motor drives the piston to perform left and right linear motion in the cylinder block;

[0010] One end of the cylinder block is connected with a pressure sensor, a positive pressure unit and a negative pressure unit.

[0011] Further, a double sealing ring and a guide ring are embedded in the outer periphery of the piston. The guide ring is located between the double sealing rings. After the double sealing ring and the guide ring are installed on the piston, they protrude from the outer peripheral surface of the piston.

[0012] Further, one-way valves are arranged between the positive pressure unit and the negative pressure unit and the cylinder block.

[0013] Further, a pressure relief port is arranged on one side of the cylinder block.

[0014] Further, the lead screw guiding mechanism includes a lead screw guiding seat and a linear guide rail. The lead screw guiding seat is used to connect the through-type lead screw motor and the linear guide rail.

[0015] Further, limit sensors are arranged at the front and rear of the lead screw guiding seat.

[0016] Further, a current monitoring and protection module is arranged inside the drive of the through-type lead screw motor.

[0017] The beneficial effects of the present utility model are as follows:

[0018] In the present utility model, one end of the lead screw part of the through-type lead screw motor is connected with the piston, and the other end is connected with the lead screw guiding mechanism. One end of the lead screw part of the through-type lead screw motor serves as both the output end of the through-type lead screw motor and the piston rod to be directly connected with the piston. The cylinder block is connected with a pressure sensor, a positive pressure unit and a negative pressure unit. When the motor controls the piston to move to the right, the gas in the negative pressure unit flows into the cylinder block, and the pressure decreases. Due to the action of the one-way valve, the pressure of the positive pressure unit remains unchanged and the gas does not flow. Similarly, when the motor controls the piston to move to the left, due to the action of the one-way valve, the pressure of the negative pressure unit remains unchanged and the medium does not flow. The gas in the cylinder block flows into the positive pressure unit, and the pressure of the positive pressure unit rises. At the same time, through the real-time feedback of the pressure sensor, the position of the piston is adjusted to accurately control the air pressure. The structure of this device is simple and compact, the appearance is beautiful, and the operation is convenient. It can not only effectively reduce the length of the overall device, but also realize the accurate control of the air pressure by the position of the piston, improving the air pressure control accuracy.

[0019] Other features and advantages of the present utility model will be described in the subsequent description, and some of them will be obvious from the description, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures pointed out in the description, the claims and the drawings. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 The structural schematic diagram of a high-precision positive and negative pressure control device provided in the embodiment of the present invention is shown.

[0022] In the figure: 1. Through-type lead screw motor; 2. Cylinder block; 3. Piston; 31. Double sealing rings; 32. Guide ring; 4. Lead screw guiding mechanism; 41. Lead screw guiding seat; 42. Linear guide rail; 5. Pressure sensor; 6. Positive pressure unit; 7. Negative pressure unit; 8. Check valve; 9. Pressure relief port; 10. Limit sensor. Specific embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] It should be noted that in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] Such as Figure 1As shown in the figure, the utility model provides a high-precision positive and negative pressure control device, which includes a through-type screw motor 1, a cylinder block 2, a piston 3, a screw guiding mechanism 4, a pressure sensor 5, a positive pressure unit 6 and a negative pressure unit 7;

[0026] One end of the screw part of the through-type screw motor 1 is connected to the piston 3, and the other end is connected to the screw guiding mechanism 4; specifically, the screw part of the through-type screw motor 1 serves both as the output end of the through-type screw motor 1 and as a piston rod to be directly connected to the piston 3, effectively reducing the lateral dimension of the device; the connection method between the through-type screw motor 1 and the piston 3 can be a threaded connection, and the connection method is not limited in the present utility model.

[0027] The screw guiding mechanism 4 includes a screw guiding seat 41 and a linear guide 42. The screw guiding seat 41 is used to connect the through-type screw motor 1 and the linear guide 42; specifically, the screw guiding mechanism 4 is used to convert the rotational motion of the through-type screw motor 1 into a linear motion to prevent the through-type screw motor 1 from rotating. Finally, the output effect is that the through-type screw motor 1 rotates in place, and the through-type screw motor 1 drives the piston 3 to perform a left-right linear motion in the cylinder block 2, and the motion accuracy can reach more than 0.01 mm, so as to precisely control the pressure on the side of the cylinder block 2 without the piston 3.

[0028] One end of the cylinder block 2 is connected with a pressure sensor 5, a positive pressure unit 6 and a negative pressure unit 7; specifically, check valves 8 are arranged between the positive pressure unit 6 and the negative pressure unit 7 and the cylinder block 2; when the through-type screw motor 1 controls the piston 3 to move to the right, the gas in the negative pressure unit 7 flows into the cylinder block 2, and the pressure decreases. Due to the action of the check valve 8, the pressure of the positive pressure unit 6 remains unchanged and the gas does not flow; similarly, when the through-type screw motor 1 controls the piston 3 to move to the left, due to the action of the check valve 8, the pressure of the negative pressure unit 7 remains unchanged and the gas does not flow, and the gas in the cylinder block 2 flows into the positive pressure unit 6, and the pressure of the positive pressure unit 6 rises; at the same time, through the real-time feedback of the pressure sensor 5, the position of the piston 3 is adjusted to precisely control the air pressure and improve the air pressure control accuracy.

[0029] As a preferred embodiment of the present application, double sealing rings 31 and a guide ring 32 are embedded on the outer periphery of the piston 3. The guide ring 32 is located between the double sealing rings 31. After the double sealing rings 31 and the guide ring 32 are installed on the piston 3, they protrude from the outer peripheral surface of the piston 3. The outer peripheral surface of the piston 3 does not contact the inner wall of the cylinder block 2. The double sealing rings 31 are pressed to contact the inner wall of the cylinder block 2 to form a sealing surface. The guide ring 32 is in clearance fit with the inner wall of the cylinder block 2 to ensure that the double sealing rings 31 are evenly pressed in the circumferential direction, making the seal of the piston 3 in the cylinder block 2 more reliable and capable of achieving a higher vacuum degree.

[0030] As a preferred embodiment of the present application, a pressure relief port 9 is provided on one side of the cylinder block 2. When the device does not operate for a long time, the pressure relief port 9 can be opened to release the pressure.

[0031] As a preferred embodiment of the present application, limit sensors 10 are provided both in front of and behind the lead screw guide seat 41. During the movement of the through-type lead screw motor 1, the lead screw guide seat 41 also moves synchronously, and the movement range is between the two limit sensors 10. The limit sensors 10 are mainly used to effectively protect the through-type lead screw motor 1, prevent over-travel operation, and improve the service life of the through-type lead screw motor 1.

[0032] As a preferred embodiment of the present application, a current monitoring and protection module is internally driven in the through-type lead screw motor 1 to prevent the through-type lead screw motor 1 from being damaged due to overload during operation, further improving the service life of the through-type lead screw motor 1.

[0033] Working principle of the present utility model:

[0034] In the present utility model, one end of the lead screw part of the through-type lead screw motor 1 is connected to the piston 3, and the other end is connected to the lead screw guiding mechanism 4. The cylinder block 2 is connected to a pressure sensor 5, a positive pressure unit 6, and a negative pressure unit 7. When the through-type lead screw motor 1 controls the piston 3 to move to the right, the gas in the negative pressure unit 7 flows into the cylinder block 2, and the pressure decreases. Due to the action of the one-way valve 8, the pressure of the positive pressure unit 6 remains unchanged and the gas does not flow. Similarly, when the through-type lead screw motor 1 controls the piston 3 to move to the left, due to the action of the one-way valve 8, the pressure of the negative pressure unit 7 remains unchanged and the gas does not flow. The gas in the cylinder block 2 flows into the positive pressure unit 6, and the pressure of the positive pressure unit 6 rises. At the same time, through the real-time feedback of the pressure sensor 5, the position of the piston 3 is adjusted to precisely control the air pressure. The device has a simple and compact structure, beautiful appearance, and convenient operation. It can not only effectively reduce the length of the overall device, but also achieve precise control of the air pressure by the position of the piston, improving the air pressure control accuracy.

[0035] In addition, in this embodiment, the device is connected to two air ports of the degassing device to ensure a constant negative pressure inside the degassing device. However, the device can not only achieve positive and negative pressure control of the air pressure, but is also effective for hydraulic control and can be applied to occasions where precise control of the flow rate is required. Through the precise movement of the piston, the flow rate and speed of the output medium can be precisely controlled.

[0036] It should be noted that the structures, proportions, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the implementation conditions of this application. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed in this application can cover.

[0037] Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A high-precision positive and negative pressure control device, characterized in that, It includes a through-type lead screw motor (1), a cylinder block (2), a piston (3), a lead screw guiding mechanism (4), a pressure sensor (5), a positive pressure unit (6) and a negative pressure unit (7); One end of the lead screw part of the through-type lead screw motor (1) is connected to the piston (3), and the other end is connected to the lead screw guiding mechanism (4); The through-type lead screw motor (1) drives the piston (3) to perform linear motion left and right in the cylinder block (2); One end of the cylinder block (2) is connected with a pressure sensor (5), a positive pressure unit (6) and a negative pressure unit (7).

2. The high-precision positive and negative pressure control device according to claim 1, characterized in that A double sealing ring (31) and a guide ring (32) are embedded in the outer periphery of the piston (3). The guide ring (32) is located between the double sealing rings (31). After the double sealing rings (31) and the guide ring (32) are installed on the piston (3), they protrude from the outer peripheral surface of the piston (3).

3. The high-precision positive and negative pressure control device according to claim 1, characterized in that, One-way valves (8) are provided between the positive pressure unit (6) and the negative pressure unit (7) and the cylinder block (2).

4. The high-precision positive and negative pressure control device according to claim 1, wherein, A pressure relief port (9) is provided on one side of the cylinder block (2).

5. A high-precision positive and negative pressure control device according to claim 1, characterized in that, The lead screw guiding mechanism (4) includes a lead screw guiding seat (41) and a linear guide rail (42). The lead screw guiding seat (41) is used to connect the through-type lead screw motor (1) and the linear guide rail (42).

6. The high-precision positive and negative pressure control device according to claim 5, wherein Limit sensors (10) are provided before and after the lead screw guiding seat (41).

7. A high-precision positive and negative pressure control device according to claim 1, characterized in that, A current monitoring and protection module is internally driven in the through-type lead screw motor (1).

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