Pressure control device of double-screw air compressor

Abstract

The utility model relates to the technical field of air compressors, and discloses a double-screw air compressor pressure control device which comprises a main machine, an oil separator and an air storage tank, a safety valve is arranged on the oil separator and comprises a valve body, an electric push rod is fixedly connected to the top end of the valve body, and a connecting pipe is fixedly connected to the end of a piston rod of the electric push rod. A connecting rod is fixedly connected to the bottom end of the connecting rod; a lower positioning seat is fixedly connected to the bottom of the lower positioning seat; a valve cover is fixedly connected to the bottom of the lower positioning seat; a valve seat is arranged at the lower part of an inner cavity of the valve body; the bottom of the annular pressure sensor is fixedly connected with an upper positioning seat, and the outer wall of the connecting rod is sleeved with a spring. The pressure relief valve can accurately control the pressure relief pressure, can be automatically and forcibly opened for pressure relief in emergency, and is safer to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of air compressors, in particular to a pressure control device for a twin-screw air compressor. Background Art

[0002] The screw air compressor is an oil-injected single-stage twin-screw compressor. It uses a high-efficiency pulley (or shaft) to drive the main engine to rotate for air compression. The main engine compression chamber is cooled and lubricated by oil injection. The air and oil mixed gas discharged from the compression chamber is separated through coarse and fine separation to separate the oil in the compressed air, and finally clean compressed air is obtained.

[0003] For example, an air compressor pressure control device disclosed in announcement number CN214145824U has the following main features: it includes a main body and an exhaust pipe, the surface of the exhaust pipe is fixedly connected to a pressure relief structure, the inner wall of the exhaust pipe is fixedly equipped with a support tube, the inner wall of the support tube is plugged with a cylindrical block, the rubber sleeve is fitted with the cylindrical block, the outer wall of the first sleeve is fitted with the inner wall of the exhaust pipe, the outer wall of the conical block is sleeved with a second sleeve, the second sleeve is fitted with the inner wall of the exhaust pipe, the second sleeve is connected to the first sleeve by a second spring, and the outer ends of the second sleeve and the conical block are equipped with a separate control adjustment structure.

[0004] The above-mentioned pressure control device can be applied to twin-screw air compressors, but in actual use, the applicant found that the above-mentioned pressure regulating devices all manually rotate the screw to adjust the pressure relief pressure, and the adjustment accuracy of the pressure relief pressure cannot be accurately grasped. At the same time, when the pressure relief valve of the above-mentioned structure is stuck, the safety valve cannot be automatically opened, so that the pressure relief operation cannot be performed under positive conditions. The safety needs to be improved. In order to solve the above-mentioned problems, a twin-screw air compressor pressure control device is provided. Utility Model Content

[0005] The purpose of the utility model is to provide a twin-screw air compressor pressure control device in order to solve the above-mentioned problems.

[0006] The technical solution adopted by the utility model is as follows: a twin-screw air compressor pressure control device, comprising a main engine, an oil separator and an air storage tank, the main engine is connected to the oil separator, the oil separator is connected to the air storage pipe, and a safety valve is arranged on the oil separator;

[0007] The safety valve includes a valve body, the top of the valve body is fixedly connected to an electric push rod, the piston rod end of the electric push rod is fixedly connected to a connecting tube, a movable block is slidably connected in the connecting tube, the bottom of the movable block is fixedly connected to a connecting rod, the bottom end of the connecting rod is fixedly connected to a lower positioning seat, the bottom of the lower positioning seat is fixedly connected to a valve cover, a valve seat is provided at the lower part of the inner cavity of the valve body, the outer wall of the connecting tube is fixedly connected to a circular plate, the bottom of the circular plate is fixedly connected to an annular pressure sensor, the bottom of the annular pressure sensor is fixedly connected to an upper positioning seat, the annular pressure sensor and the upper positioning seat are both gap-mounted on the connecting tube, a spring is sleeved on the outer wall of the connecting rod, and the upper and lower ends of the spring are respectively clamped on the upper positioning seat and the lower positioning seat.

[0008] In a preferred embodiment, an exhaust pipe is connected to the upper side wall of the valve body.

[0009] In a preferred embodiment, an external thread spiral tube is arranged at the lower part of the valve body.

[0010] In a preferred embodiment, a symmetrical guide block is fixedly connected to the side wall of the circular plate, and a symmetrical guide groove is formed on the inner wall of the valve body, and the guide block is inserted into the guide groove.

[0011] In a preferred embodiment, the pressure sensor 14 and the electric push rod 6 are both externally connected to a PLC controller.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0013] 1. In the present invention, the electric push rod and the pressure sensor are used in combination to accurately control the spring compression amount, thereby improving the accuracy of the pressure relief pressure.

[0014] 2. In the utility model, when an emergency situation occurs in which the pressure cannot be relieved due to abnormal jamming during use, and the internal pressure of the oil separator is detected to be too high, the control system can control the electric push rod piston rod to retract, thereby forcing the connecting pipe to pull the movable block upward, and then forcing the valve cover at the bottom of the connecting rod to open, thereby realizing the pressure relief operation in an emergency, making the safety valve safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the oil separator in the utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the oil separator in the utility model from the front view;

[0018] Figure 4 It is a cross-sectional view of the connection structure on the connecting pipe in the utility model.

[0019] Markings in the figure: 1-main engine, 2-oil separator, 3-gas tank, 4-safety valve, 5-valve body, 6-electric push rod, 7-connecting pipe, 8-movable block, 9-connecting rod, 10-lower positioning seat, 11-valve cover, 12-valve seat, 13-round plate, 14-annular pressure sensor, 15-upper positioning seat, 16-spring, 17-exhaust pipe, 18-external thread screw, 19-guide block, 20-guide groove. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The following will be combined Figure 1-Figure 4 A twin-screw air compressor pressure control device according to an embodiment of the utility model is described in detail.

[0022] Example:

[0023] The utility model provides a twin-screw air compressor pressure control device, referring to Figure 1 As shown, it includes a main engine 1, an oil separator 2 and an air storage tank 3. The main engine 1 is connected to the oil separator 2, and the oil separator 2 is connected to the air storage tank 3. In this structure, the main engine 1, the oil separator 2 and the air storage tank 3 form a twin-screw air compressor. The main engine 1 compresses the air, the oil separator 2 separates the oil and the air, and then the air storage tank 3 stores the compressed air for use.

[0024] refer to Figure 1 As shown, a safety valve 4 is provided on the oil separator 2, and when the internal pressure of the oil separator 2 is too high, the safety valve 4 can be used to relieve the pressure of the oil separator 2, thereby protecting the oil separator 2.

[0025] refer to Figure 2 , Figure 3 and Figure 4As shown, the safety valve 4 includes a valve body 5, the top of the valve body 5 is fixedly connected to an electric push rod 6, the piston rod end of the electric push rod 6 is fixedly connected to a connecting pipe 7, a movable block 8 is slidably connected in the connecting pipe 7, the bottom of the movable block 8 is fixedly connected to a connecting rod 9, the bottom end of the connecting rod 9 is fixedly connected to a lower positioning seat 10, the bottom of the lower positioning seat 10 is fixedly connected to a valve cover 11, a valve seat 12 is arranged at the lower part of the inner cavity of the valve body 5, a circular plate 13 is fixedly connected to the outer wall of the connecting pipe 7, an annular pressure sensor 14 is fixedly connected to the bottom of the circular plate 13, the pressure sensor 14 and the electric push rod 6 are both externally connected to the PLC controller, the bottom of the annular pressure sensor 14 is fixedly connected to an upper positioning seat 15, the annular pressure sensor 14 and the upper positioning seat 15 are both sleeved on the connecting pipe 7 with a gap, and the outer wall of the connecting rod 9 is sleeved with Spring 16, the upper and lower ends of the spring 16 are respectively clamped on the upper positioning seat 15 and the lower positioning seat 10. The spring 16, the valve body 5 and the valve seat 12 of this structure constitute an automatic pressure relief device of the safety valve 4. When the pressure of the oil separator 2 is too large, the air pressure will overcome the downward pressure of the spring 16, so that the valve cover 11 on the valve seat 12 is opened, and the pressure relief operation is realized, thereby protecting the oil separator 2. At the same time, during use, the connecting pipe 7 can be driven downward by the electric push rod 6, and the connecting pipe 7 can press the spring 16 downward by pushing the disc 13, thereby adjusting the maximum pressure relief pressure of the safety valve 4. During adjustment, the downward pressure can be detected by the annular pressure sensor 14, so that the PLC controller can control the extension and contraction of the electric push rod 6, and then the contraction degree of the spring 16 can be accurately controlled, thereby improving the accuracy of pressure control;

[0026] When the above structure is in use and an emergency situation occurs in which the pressure cannot be relieved due to abnormal jamming, and the internal pressure of the oil separator 2 is detected to be too high, the control system can control the piston rod of the electric push rod 6 to contract, thereby forcing the connecting pipe 7 to pull the movable block 8 upward, and then forcing the valve cover 11 at the bottom of the connecting rod 9 to open, thereby realizing the pressure relief operation in an emergency, thereby making the safety valve 4 safer to use.

[0027] refer to Figure 2 As shown, the upper side wall of the valve body 5 is connected with an exhaust pipe 17 . This structure utilizes the exhaust pipe 17 to facilitate the discharge of compressed air from the valve body 5 .

[0028] refer to Figure 2 As shown, an external threaded screw 18 is provided at the lower part of the valve body 5 , and this structure of the external threaded screw 18 facilitates the connection between the valve body 5 and the oil separator 2 .

[0029] refer to Figure 3 As shown, a symmetrical guide block 19 is fixedly connected to the side wall of the circular plate 13, and a symmetrical guide groove 20 is opened on the inner wall of the valve body 5. The guide block 19 is inserted into the guide groove 20. This structure uses the guide block 19 and the guide groove 20 to guide the up and down movement of the connecting pipe 7.

[0030] It should be noted that the safety valve device in the above embodiment is applied to a twin-screw air compressor, the model of the annular pressure sensor is SK115, and the circuit equipment and control system designed above are all prior art, the principles are public, and this application does not improve them, so they will not be introduced in detail here.

[0031] The implementation principle of a twin-screw air compressor pressure control device of the embodiment of the present application is as follows: when in use, when the pressure of the oil separator 2 is too large, the air pressure will overcome the downward pressure of the spring 16, thereby opening the valve cover 11 on the valve seat 12, thereby realizing the pressure relief operation, thereby protecting the oil separator 2. At the same time, during use, the connecting pipe 7 can be driven downward by the electric push rod 6, and the connecting pipe 7 can press the spring 16 downward by pushing the disc 13, thereby adjusting the maximum pressure relief pressure of the safety valve 4. During adjustment, the downward pressure can be detected by the annular pressure sensor 14, so that the PLC controller controls the extension and contraction of the electric push rod 6, thereby accurately controlling the contraction degree of the spring 16, thereby improving the accuracy of pressure control;

[0032] When the above structure is in use and an emergency situation occurs in which the pressure cannot be relieved due to abnormal jamming, and the internal pressure of the oil separator 2 is detected to be too high, the PLC controller can control the piston rod of the electric push rod 6 to retract, thereby forcing the connecting pipe 7 to pull the movable block 8 upward, and then forcing the valve cover 11 at the bottom of the connecting rod 9 to open, thereby realizing the pressure relief operation in an emergency, making the use of the safety valve 4 safer.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A twin-screw air compressor pressure control device, comprising a main engine (1), an oil separator (2) and an air storage tank (3), characterized in that: The main engine (1) is in communication with the oil separator (2), the oil separator (2) is in communication with the gas storage tank (3), and a safety valve (4) is provided on the oil separator (2); The safety valve (4) comprises a valve body (5), the top end of the valve body (5) is fixedly connected to an electric push rod (6), the piston rod end of the electric push rod (6) is fixedly connected to a connecting pipe (7), a movable block (8) is slidably connected inside the connecting pipe (7), the bottom of the movable block (8) is fixedly connected to a connecting rod (9), the bottom end of the connecting rod (9) is fixedly connected to a lower positioning seat (10), the bottom of the lower positioning seat (10) is fixedly connected to a valve cover (11), the lower part of the inner cavity of the valve body (5) is provided with a valve seat (12), and the A circular plate (13) is fixedly connected to the outer wall of the connecting tube (7), an annular pressure sensor (14) is fixedly connected to the bottom of the circular plate (13), an upper positioning seat (15) is fixedly connected to the bottom of the annular pressure sensor (14), the annular pressure sensor (14) and the upper positioning seat (15) are both sleeved on the connecting tube (7) with a gap, a spring (16) is sleeved on the outer wall of the connecting rod (9), and the upper and lower ends of the spring (16) are respectively clamped on the upper positioning seat (15) and the lower positioning seat (10).

2. A twin-screw air compressor pressure control device as claimed in claim 1, characterized in that: An exhaust pipe (17) is connected to the upper side wall of the valve body (5).

3. A twin-screw air compressor pressure control device as claimed in claim 1, characterized in that: An external thread spiral tube (18) is arranged at the lower part of the valve body (5).

4. A twin-screw air compressor pressure control device as claimed in claim 1, characterized in that: A symmetrical guide block (19) is fixedly connected to the side wall of the circular plate (13), and a symmetrical guide groove (20) is provided on the inner wall of the valve body (5), and the guide block (19) is inserted into the guide groove (20).

5. A twin-screw air compressor pressure control device as claimed in claim 1, characterized in that: The pressure sensor (14) and the electric push rod (6) are both externally connected to a PLC controller.

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