Air compressor pressure switch capable of releasing pressure

Abstract

An air compressor pressure switch capable of releasing pressure comprises a shell assembly, a pressure electric control assembly and an automatic pressure releasing assembly. An air compressor connecting port and an air storage tank connecting port are formed in the two ends of the shell assembly respectively, an inner cavity A and an inner cavity B are formed in the shell assembly, the inner cavity A and the inner cavity B are communicated through a middle channel, and an air leakage hole is formed in the middle channel; the pressure electric control assembly is arranged in the inner cavity B; the automatic pressure relief assembly is arranged among the inner cavity A, the middle channel and the inner cavity B; the automatic pressure relief assembly forms surface sealing between the inner cavity A and the middle channel, the automatic pressure relief assembly is in action association with the movable contact, and when the movable contact is separated from the static contact, the surface sealing state between the inner cavity A and the inner cavity B is relieved. The automatic pressure relief device is applied to an air storage tank inflation system, when the air storage tank reaches the set inflation pressure, high-pressure air between the air compressor and the air pressure switch can be automatically relieved, secondary starting difficulty of the air compressor is avoided, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure switches, in particular to an air compressor pressure switch capable of relieving pressure. Background Art

[0002] The air compressor pressure switch is a key control component of the air tank charging system. It is used to control the charging pressure of the air compressor to the air tank. When the air tank reaches the set pressure value, it automatically disconnects the charging pump motor circuit to stop charging the air tank.

[0003] The structural diagram of the gas tank charging system is as follows: Figure 6 As shown, it includes an air pressure switch 51, an air storage tank 52, an air compressor 53, a three-way joint 54 and a one-way valve 55; the air pressure switch 51 is provided with an air compressor connection port and an air storage tank connection port at both ends respectively; the air storage tank 52 is provided with an air charging port 521 and a pressure sensing port 522; the air compressor 53 is connected to the air storage tank connection port of the air pressure switch 51 through the No. 1 port 541 of the three-way joint 54, the No. 2 port 542 of the three-way joint 54, the one-way valve 55, the air charging port 521 of the air storage tank 52 and the pressure sensing port 522 of the air storage tank 52 in sequence; the air compressor 53 is connected to the air compressor connection port of the air pressure switch 51 through the No. 1 port 541 of the three-way joint 54 and the No. 3 port 543 of the three-way joint 54 in sequence. Figure 6 The thin solid lines and thick solid lines in the figure represent gas pipelines. Figure 6 The dotted lines in the figure represent electrical connections.

[0004] After the air tank completes the inflation operation, high-pressure air from the last inflation process remains on the air pipeline between "air compressor - port No. 1 of the three-way connector - port No. 2 of the three-way connector - air compressor connection port of the air pressure switch" (see the pipeline indicated by the thick solid line), which will make it difficult to start the air compressor next time. More seriously, it will cause excessive starting current, shorten the life of the motor, or even burn the motor. Summary of the invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a pressure switch for an air compressor that can relieve pressure, which realizes that after the air tank in the air tank charging system reaches the charging pressure, the pipeline between the air compressor and the air pressure switch automatically relieves pressure, thereby avoiding difficulties in secondary starting of the air compressor and extending the service life of the motor.

[0006] The technical solution of the utility model is: an air compressor pressure switch capable of pressure relief, comprising a housing component, a pressure electric control component and an automatic pressure relief component;

[0007] An air compressor connection port and an air tank connection port are respectively provided at both ends of the shell component, and an inner cavity A connected to the air compressor connection port and an inner cavity B connected to the air tank connection port are provided inside the shell component, and the inner cavity A and the inner cavity B are connected through a middle channel, and a vent hole connected to the outside of the shell component is provided in the middle channel; the shell component includes a base, a shell cover and a gas cup connected in sequence from one end to the other end; the air compressor connection port is provided at the end of the base, the gas tank connection port is provided at the end of the gas cup, and the inner cavity A and the middle channel are both provided inside the base;

[0008] The pressure electric control component is arranged in the inner cavity B; the pressure electric control component comprises a moving contact and a static contact; the pressure electric control component is used to sense the air pressure at the connection port of the air storage tank, and when the air pressure does not reach the set value, the moving contact and the static contact are kept in contact, and when the air pressure reaches the set value, the moving contact and the static contact are separated from each other;

[0009] The automatic pressure relief component is arranged between the inner cavity A-the middle channel-the inner cavity B; the automatic pressure relief component forms a surface seal between the inner cavity A and the middle channel, and the automatic pressure relief component is associated with the action of the moving contact. When the moving contact is separated from the static contact, the surface seal state between the inner cavity A and the inner cavity B is released.

[0010] A further technical solution of the utility model is: the middle channel includes a large-diameter section and a small-diameter section which are connected in sequence, an annular step surface D is provided between the large-diameter section and the small-diameter section, an annular step surface A is provided between the inner cavity A and the middle channel, and the air leakage hole is provided on the base.

[0011] A further technical solution of the utility model is: the pressure electric control component includes a static contact, a guide sleeve, a first spring sheet, a second spring sheet, a moving contact and a ceramic rod; the static contact and the guide sleeve are both fixedly installed in the inner cavity B; the first spring sheet is confined between the guide sleeve and the gas cup; the two ends of the second spring sheet are respectively a fixed end and a cantilevered end, the fixed end is fixedly connected in the inner cavity B, and the cantilevered end is fixedly connected to the moving contact; the ceramic rod is movably installed in the inner hole of the guide sleeve, one end of which contacts the end face of the first spring sheet, and the other end contacts the end face of the second spring sheet, the ceramic rod is driven by the deformation of the first spring sheet to move along the inner hole of the guide sleeve, and then pushes the second spring sheet or detaches from the second spring sheet; when the ceramic rod pushes the second spring sheet, the moving contact is separated from the static contact, and when the ceramic rod detaches from the second spring sheet, the moving contact and the static contact remain in contact.

[0012] A further technical solution of the utility model is: the automatic pressure relief assembly includes a retaining ring, a top sleeve, a valve core and a spring; the retaining ring is fixedly installed in the inner cavity A and is positioned in the axial direction, the end thereof facing the air compressor connection port is the outer end face, and the end thereof facing the middle channel is the inner end face; one end of the top sleeve faces the inner end face of the retaining ring, and the other end extends into the large-diameter section of the middle channel, an annular step surface C is provided on the outer wall of the top sleeve, the inner hole of the top sleeve includes a large inner diameter hole and a small inner diameter hole connected in sequence, and an annular step surface B is provided between the large inner diameter hole and the small inner diameter hole; the valve core includes a rod body and a conical head and a top head fixedly connected at both ends of the rod body, the rod body is movably installed in the middle channel, and slides with the small-diameter section of the middle channel The spring is mounted on the rod of the valve core, one end of which is against the annular step surface D, and the other end is against the end surface of the top sleeve; under the action of the air pressure in the inner cavity A, the annular step surface C of the top sleeve is close to the annular step surface A, and the conical head of the valve core is close to the annular step surface B, thereby jointly forming a surface seal between the inner cavity A and the middle channel; when the ceramic rod pushes the second spring sheet to disengage the moving contact from the static contact, the second spring sheet pushes the top head of the valve core, causing the valve core to move along the small aperture section of the middle channel, thereby releasing the surface seal between the inner cavity A and the middle channel.

[0013] A further technical solution of the utility model is: it also includes a manual pressure relief component; the manual pressure relief component includes a rotating shaft, a knob, a finger and a torsion spring; the rotating shaft is rotatably installed in the inner cavity B, and one end of the rotating shaft extends out of the inner cavity B to form an exposed end; the knob is fixedly installed on the exposed end of the rotating shaft; the finger is fixedly connected to the rotating shaft, and it pushes the second elastic sheet or disengages from the second elastic sheet as the rotating shaft rotates; the torsion spring is installed between the rotating shaft and the base, and through its elastic force, the rotating shaft keeps the finger disengaged from the second elastic sheet when no external force is applied; when the finger disengages from the second elastic sheet, the moving contact and the static contact remain in contact; when the finger pushes the second elastic sheet to disengage the moving contact from the static contact, the second elastic sheet pushes the top head of the valve core, so that the valve core moves along the small aperture section of the middle channel, thereby releasing the surface seal between the inner cavity A and the middle channel.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. It is applied to the gas tank charging system. When the gas tank reaches the set charging pressure, the high-pressure air between the air compressor and the air pressure switch can automatically release the pressure, avoiding the difficulty of secondary starting of the air compressor and extending the service life of the motor.

[0016] 2. It is equipped with a manual pressure relief component. When an emergency requires quick pressure relief, the high-pressure air between the air compressor and the air pressure switch can be quickly removed by twisting the knob.

[0017] The utility model is further described below in conjunction with the figures and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the internal structure diagram of the utility model;

[0019] Figure 2 This is the appearance diagram of the utility model;

[0020] Figure 3 is a structural schematic diagram of the rotating shaft;

[0021] Figure 4 It is a schematic diagram of the structure of the top cover;

[0022] Figure 5 for Figure 4 AA section view;

[0023] Figure 6 This is a simplified diagram of the structure of the gas tank charging system.

[0024] Legend: base 11; compressor connection port 111; shell cover 12; gas cup 13; gas tank connection port 131; inner cavity A14; inner cavity B15; inner cavity B16; vent hole 17; static contact 21; guide sleeve 22; first spring piece 23; second spring piece 24; moving contact 25; ceramic rod 26; retaining ring 31; top sleeve 32; valve core 33; rod body 331; cone head 332; top head 333; spring 34; rotating shaft 41; knob 42; dial finger 43; annular step surface A100; annular step surface B200; annular step surface C300; annular step surface D400; quick pipe joint 500; sealing gasket 600. DETAILED DESCRIPTION Example 1

[0025] like Figure 1-5 As shown, the air compressor pressure switch capable of relieving pressure includes a housing component, a pressure electronic control component and an automatic pressure relief component.

[0026] The two ends of the housing component are provided with an air compressor connection port 111 and an air tank connection port 131, respectively. The housing component is provided with an inner cavity A14 connected to the air compressor connection port 111 and an inner cavity B15 connected to the air tank connection port 131. The inner cavity A14 and the inner cavity B16 are connected through a middle channel 15. The middle channel 15 is provided with an air leakage hole 17 connected to the outside of the housing component. The housing component includes a base 11, a shell cover 12 and a gas cup 13 connected in sequence from one end to the other end. The air compressor connection port 111 is arranged at the end of the base 11, the air tank connection port 131 is arranged at the end of the gas cup 13, the inner cavity A14 and the middle channel 15 are both arranged inside the base 11, the middle channel 15 includes a large-diameter section and a small-diameter section connected in sequence, an annular step surface D400 is arranged between the large-diameter section and the small-diameter section, an annular step surface A100 is arranged between the inner cavity A14 and the middle channel 15, and the air leakage hole 17 is arranged on the base 11.

[0027] The pressure electric control component is arranged in the inner cavity B16; the pressure electric control component includes a static contact 21, a guide sleeve 22, a first spring piece 23, a second spring piece 24, a moving contact 25 and a ceramic rod 26; the static contact 21 and the guide sleeve 22 are both fixedly installed in the inner cavity B16; the first spring piece 23 is limited between the guide sleeve 22 and the gas cup 13; the two ends of the second spring piece 24 are a fixed end and a cantilevered end respectively, the fixed end is fixedly connected in the inner cavity B16, and the cantilevered end is fixedly connected to the moving contact 25; the ceramic rod 26 is movably installed in the inner hole of the guide sleeve 22, one end of which contacts the end face of the first spring piece 23, and the other end contacts the end face of the second spring piece 24. The ceramic rod 26 is driven by the deformation of the first spring piece 23 to move along the inner hole of the guide sleeve 22, and then pushes the second spring piece 24 or detaches from the second spring piece 24; the pressure electric control component is used to sense the air pressure at the gas tank connection port 131. When the air pressure does not reach the set value, the deformation of the first spring piece 23 is not enough to cause the ceramic rod 26 to produce a sufficient displacement, and the ceramic rod 26 is not enough to push the second spring piece 24, so that the moving contact 25 and the static contact 21 remain in contact. When the air pressure reaches the set value, the deformation of the first spring piece 21 is enough to push the ceramic rod 26 to produce a sufficient displacement, and the ceramic rod 26 can also push the second spring piece 24, so that the moving contact 25 and the static contact 21 are separated.

[0028] The automatic pressure relief component is arranged between the inner cavity A14-the middle channel 15-the inner cavity B16; the automatic pressure relief component forms a surface seal between the inner cavity A14 and the middle channel 15, and the automatic pressure relief component is associated with the action of the moving contact 25. When the moving contact 25 is separated from the static contact 21, the surface seal state between the inner cavity A14 and the inner cavity B16 is released. The automatic pressure relief assembly includes a retaining ring 31, a top sleeve 32, a valve core 33 and a spring 34; the retaining ring 31 is fixedly installed in the inner cavity A14 and is positioned in the axial direction, with its end facing the air compressor connection port 111 as the outer end face, and its end facing the middle channel 15 as the inner end face; one end of the top sleeve 32 faces the inner end face of the retaining ring 31, and the other end extends into the large-diameter section of the middle channel 15, an annular step surface C300 is provided on the outer wall of the top sleeve 32, and the inner hole of the top sleeve 32 includes a large inner diameter hole and a small inner diameter hole connected in sequence, and an annular step surface B200 is provided between the large inner diameter hole and the small inner diameter hole; the valve core 33 includes a rod body 331 and a conical head 332 and a top head 333 fixedly connected to both ends of the rod body 331, the rod body 331 is movably installed in the middle channel 15, and slides with the small-diameter section of the middle channel 15, and the top head 333 extends into the inner cavity B1 6, and is on the moving path of the second elastic sheet 24, the conical head 332 passes through the small inner diameter hole of the top sleeve 32, and extends into the large inner diameter hole of the top sleeve 32; the spring 34 is sleeved on the rod body 331 of the valve core 33, one end of which is against the annular step surface D400, and the other end is against the end surface of the top sleeve 32; under the action of the air pressure in the inner cavity A14, the annular step surface C300 of the top sleeve 32 is close to the annular step surface A100, and the conical head 332 of the valve core 33 is close to the annular step surface B200, thereby jointly forming a surface seal between the inner cavity A14 and the middle channel 15; when the ceramic rod 26 pushes the second elastic sheet 24 to disengage the moving contact 25 from the static contact 21, the second elastic sheet 24 pushes the top head 333 of the valve core 33, so that the valve core 33 moves along the small aperture section of the middle channel 15, thereby releasing the surface seal between the inner cavity A14 and the middle channel 15.

[0029] Preferably, it also includes a manual pressure relief assembly; the manual pressure relief assembly includes a rotating shaft 41, a knob 42, a finger 43 and a torsion spring (not shown in the figure); the rotating shaft 41 is rotatably installed in the inner cavity B16, and one end thereof extends from the inner cavity B16 to form an exposed end; the knob 42 is fixedly installed on the exposed end of the rotating shaft 41; the finger 43 is fixedly connected to the rotating shaft 41, and it pushes the second elastic sheet 24 or disengages from the second elastic sheet 24 as the rotating shaft 41 rotates; when the finger 43 disengages from the second elastic sheet 24, the moving contact 25 and the static contact 21 remain in contact. When an emergency situation arises and the high-pressure air in the inner cavity A14 needs to be immediately released, the knob 42 is manually twisted (the twisting process needs to overcome the elastic force of the torsion spring) to rotate the shaft 41 together with the finger 43. The finger 43 pushes the second spring piece 24 to disengage the moving contact 25 from the static contact 21. At the same time, the second spring piece 24 pushes the top portion 333 of the valve core 33 to move the valve core 33 along the small aperture section of the middle channel 15, thereby releasing the surface seal between the inner cavity A14 and the middle channel 15. The pressurized air in the inner cavity A14 then enters the middle channel 15 and is discharged to the outside through the pressure relief hole.

[0030] Preferably, a quick pipe joint 500 is fixedly installed in the air compressor connection port 111 of the base 11 , and a sealing gasket 600 is installed in the pipe section between the quick pipe joint 500 and the retaining ring 31 in the inner hole of the base 11 .

[0031] The utility model is applied to the gas storage tank charging system (see Figure 6 ) is used to control the inflation pressure of the air compressor to the air tank. When the air tank reaches the set pressure value, the circuit of the air pump is automatically disconnected to stop inflating the air tank. The air compressor connection port 111 of the utility model is connected to the air compressor, and the air tank connection port 131 is connected to the air tank. Start the air compressor to inflate the air tank.

[0032] When the set inflation pressure is not reached, two things happen at the same time: Ⅰ. The pressure in the inner cavity A14 gradually increases. Under the action of the air pressure in the inner cavity A14, the annular step surface C300 of the top sleeve 32 is close to the annular step surface A100, and the conical head 332 of the valve core 33 is close to the annular step surface B200, thereby jointly forming a surface seal between the inner cavity A14 and the middle channel 15; Ⅱ. The pressure in the gas storage tank gradually increases, the deformation of the first spring piece 21 gradually increases, and the ceramic rod 26 is pushed by the first spring piece 21 and gradually approaches and contacts the second spring piece 24.

[0033] When the set inflation pressure is reached, two things happen at the same time: Ⅰ. The deformation of the first spring piece 21 reaches the relative maximum value. At this time, the movement of the ceramic rod 26 is sufficient to push the second spring piece 24, so that the moving contact 25 and the static contact 21 are separated, and the air compressor is powered off, thereby stopping the inflation into the air tank; Ⅱ. When the ceramic rod 26 pushes the second spring piece 24 to separate the moving contact 25 from the static contact 21, the second spring piece 24 pushes the top head 333 of the valve core 33, so that the valve core 33 moves along the small aperture section of the middle channel 15, so that the conical head 332 of the valve core 33 is out of contact with the annular sleeve interface B200, thereby releasing the surface seal between the inner cavity A14 and the middle channel 15, and the pressurized air in the inner cavity A14 immediately enters the middle channel 15, and is then discharged to the outside through the pressure relief hole.

Claims

1. The pressure switch of the air compressor capable of releasing pressure is characterized by: It includes a housing component, a pressure electronic control component and an automatic pressure relief component; An air compressor connection port and an air tank connection port are respectively provided at both ends of the shell component, and an inner cavity A connected to the air compressor connection port and an inner cavity B connected to the air tank connection port are provided inside the shell component, and the inner cavity A and the inner cavity B are connected through a middle channel, and a vent hole connected to the outside of the shell component is provided in the middle channel; the shell component includes a base, a shell cover and a gas cup connected in sequence from one end to the other end; the air compressor connection port is provided at the end of the base, the gas tank connection port is provided at the end of the gas cup, and the inner cavity A and the middle channel are both provided inside the base; The pressure electric control component is arranged in the inner cavity B; The pressure electric control component includes a moving contact and a static contact; the pressure electric control component is used to sense the air pressure at the connection port of the air storage tank, and when the air pressure does not reach the set value, the moving contact and the static contact are kept in contact, and when the air pressure reaches the set value, the moving contact and the static contact are separated from each other; The automatic pressure relief component is arranged between the inner cavity A-the middle channel-the inner cavity B; the automatic pressure relief component forms a surface seal between the inner cavity A and the middle channel, and the automatic pressure relief component is associated with the action of the moving contact. When the moving contact is separated from the static contact, the surface seal state between the inner cavity A and the inner cavity B is released.

2. The pressure switch for air compressor capable of releasing pressure as claimed in claim 1, characterized in that: The middle channel comprises a large-diameter section and a small-diameter section which are connected in sequence, an annular step surface D is provided between the large-diameter section and the small-diameter section, an annular step surface A is provided between the inner cavity A and the middle channel, and the air leakage hole is provided on the base.

3. The pressure switch for air compressor capable of releasing pressure as claimed in claim 2, characterized in that: The pressure electric control component includes a static contact, a guide sleeve, a first spring sheet, a second spring sheet, a moving contact and a ceramic rod; the static contact and the guide sleeve are both fixedly installed in the inner cavity B; the first spring sheet is confined between the guide sleeve and the gas cup; the two ends of the second spring sheet are respectively a fixed end and a cantilevered end, the fixed end is fixedly connected in the inner cavity B, and the cantilevered end is fixedly connected to the moving contact; the ceramic rod is movably installed in the inner hole of the guide sleeve, one end of which contacts the end face of the first spring sheet, and the other end contacts the end face of the second spring sheet, the ceramic rod is driven by the deformation of the first spring sheet to move along the inner hole of the guide sleeve, and then pushes the second spring sheet or detaches from the second spring sheet; when the ceramic rod pushes the second spring sheet, the moving contact is separated from the static contact, and when the ceramic rod detaches from the second spring sheet, the moving contact and the static contact remain in contact.

4. The pressure switch for air compressor capable of releasing pressure as claimed in claim 3, characterized in that: The automatic pressure relief assembly includes a retaining ring, a top sleeve, a valve core and a spring; the retaining ring is fixedly installed in the inner cavity A and is positioned in the axial direction, the end of which faces the air compressor connection port is the outer end face, and the end of which faces the middle channel is the inner end face; one end of the top sleeve faces the inner end face of the retaining ring, and the other end extends into the large-diameter section of the middle channel, an annular step surface C is provided on the outer wall of the top sleeve, the inner hole of the top sleeve includes a large inner diameter hole and a small inner diameter hole connected in sequence, and an annular step surface B is provided between the large inner diameter hole and the small inner diameter hole; the valve core includes a rod body and a conical head and a top head fixedly connected at both ends of the rod body, the rod body is movably installed in the middle channel, and slides with the small-diameter section of the middle channel, and the top head extends The spring sleeve is mounted on the rod body of the valve core, one end of which is against the annular step surface D, and the other end is against the end surface of the top sleeve; under the action of the air pressure in the inner cavity A, the annular step surface C of the top sleeve is in close contact with the annular step surface A, and the conical head of the valve core is in close contact with the annular step surface B, thereby jointly forming a surface seal between the inner cavity A and the middle channel; when the ceramic rod pushes the second spring sheet to disengage the moving contact from the static contact, the second spring sheet pushes the top head of the valve core, causing the valve core to move along the small aperture section of the middle channel, thereby releasing the surface seal between the inner cavity A and the middle channel.

5. The pressure switch for air compressor capable of releasing pressure as claimed in claim 4, characterized in that: It also includes a manual pressure relief component; the manual pressure relief component includes a rotating shaft, a knob, a finger and a torsion spring; the rotating shaft is rotatably installed in the inner cavity B, and one end of the rotating shaft extends out from the inner cavity B to form an exposed end; the knob is fixedly installed on the exposed end of the rotating shaft; the finger is fixedly connected to the rotating shaft, and it pushes the second elastic sheet or disengages from the second elastic sheet as the rotating shaft rotates; the torsion spring is installed between the rotating shaft and the base, and through its elastic force, the rotating shaft keeps the finger disengaged from the second elastic sheet when no external force is applied; when the finger disengages from the second elastic sheet, the moving contact and the static contact remain in contact; when the finger pushes the second elastic sheet to disengage the moving contact from the static contact, the second elastic sheet pushes the top head of the valve core, so that the valve core moves along the small aperture section of the middle channel, thereby releasing the surface seal between the inner cavity A and the middle channel.

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