CN218954163U - Isolation-free film time-delay action electromagnetic unloading device and air compressor provided with same - Google Patents

Abstract

The utility model belongs to the technical field of fluid control, and relates to an isolation-free film time-delay action electromagnetic unloading device, which is characterized in that a time-delay action circuit is added to the design of an electromagnetic valve, so that the purpose of regulating and controlling target pressure of the electromagnetic valve is achieved. Particularly, the delay action electromagnetic unloading device abandons the vulnerable part of the isolating diaphragm in the prior art, so that on one hand, the hidden danger that the delay action electromagnetic unloading is likely to have poor working reliability under the long-term operation working condition is effectively eliminated, and on the other hand, the complexity of manufacturing, assembling and detecting the device is reduced, thereby being beneficial to reducing the production cost. Finally, by assembling the time-delay action electromagnetic unloading device on the air compressor product, the air compressor system can realize quick unloading, and simultaneously can realize time-delay closing of the unloading hole when the compressor is started, thereby better solving the great problems that the traditional compressor system is difficult to realize quick unloading, high back pressure smooth starting, energy consumption reduction and the like.

Description

Isolation-free film time-delay action electromagnetic unloading device and air compressor provided with same

Technical field:

the utility model belongs to the technical field of fluid mechanical control, relates to a device for managing the behaviors of fluid flow direction, pressure, driving and the like, in particular to a device for controlling the pressure of a fluid system based on sequential logic to achieve reliable operation and energy conservation and consumption reduction, and particularly relates to an isolation-free film time-delay action electromagnetic unloading device for pressure management of an air compressor system.

The background technology is as follows:

as is well known, among various fluid mechanical devices and systems thereof, such as vacuum pumps, hydraulic pumps, and air compressors, it is generally necessary to logically manage the flow direction, pressure, and driving of fluid working media therein, thereby achieving the objectives of reliable operation and energy saving and consumption reduction of these devices. In the air compressor system, the high-pressure gas working medium output by the compressor generally needs to flow through various pipelines and valves before reaching a designated target area or a lower device, and in the working process, intermittent operation requirements often exist, such as that when the gas tank in the air compressor system reaches a preset pressure value, the gas tank in the air compressor system should be stopped, and when the lower device in the system causes the pressure in the gas tank to drop due to gas consumption and the like, the air compressor should be restarted to timely supplement the gas tank, and the operation is repeated repeatedly and continuously circulated, or the operation condition of the compressor is intermittent and intermittent.

The start and stop of the compressor in the above-mentioned air compressor system is, of course, frequently repeated or even frequent. In general, in order to avoid the backflow of high-pressure gas in a gas tank into a compressor, a check valve is generally disposed at the inlet end of the gas tank, and at the compressor end, a discharge check valve is also disposed, in other words, a section of a pipeline from the compressor to the gas tank has a high-pressure gas working medium even during the period when the compressor stops supplying gas, and the high-pressure gas working medium essentially forms the back pressure of the compressor, that is, each time the compressor is started, the back pressure needs to be overcome, and the starting of the compressor under the high-back pressure working condition causes three disadvantages: 1) One is that the starting load of the compressor is higher, so that the compressor has larger impact on a power grid, and meanwhile, larger electric energy is consumed, so that the operation working condition is unfavorable for energy conservation and consumption reduction; 2) The other is that the high back pressure starting environment has great negative influence on the compressor, and as a result, the piston and the crankshaft of the compressor are impacted so much that the service lives of the core parts of the compressor are shortened; 3) And thirdly, in some small-sized air compressor system occasions, the compressor cannot be started smoothly due to the working condition of high back pressure, and the reason is that the rotation speed of the compressor is low at the initial stage of starting, so that the rotation inertia cannot be effectively utilized to overcome the strong starting resistance caused by the high back pressure, and therefore the air cannot be supplemented to the air tank, and the normal operation of the system is affected.

In order to overcome and ameliorate the above disadvantages, it is necessary to unload the high pressure condition of the section of the line from the compressor to the gas tank when the compressor is suspended to create an advantage for the next start-up. An example of back pressure management for an air compressor system is "electromechanical time delay valve based on bernoulli principle and air compressor equipped with the time delay valve" and "a pilot type electronic unloading valve and compressor system equipped with the unloading valve" disclosed in CN113623421a, which are proposed in chinese patent application CN 201921208067.9. In the technical schemes disclosed in the two patent applications, the electromechanical time delay valves are adopted, so that the quick unloading of the back pressure can be realized when the air compressor system is stopped, the unloading hole can be closed when the air compressor system is restarted, and the coordination difficulty of the traditional air compressor on quick unloading, smooth starting of high back pressure and energy consumption control is well solved. However, the problem is that we can not make any further improvements to the above-mentioned patent solution to improve the performance of the electromechanical time delay valve? The answer is affirmative, and the analysis finds that: in the two patent technical schemes, an elastic isolation diaphragm is adopted to control the pressure threshold value of the opening and closing of the unloading hole, and practice proves that the existence of the isolation diaphragm can effectively manage the pressure distribution in the delay valve, the effect is quite good, the problem of high cost exists at the same time, and in addition, the hidden danger in the aspect of working reliability exists in the existence of the diaphragm for the air compressors needing long-term working. They also have room for further improvement in lifting for the reasons described above.

The utility model comprises the following steps:

in order to perform more reliable behavior logic management on the flow direction, the pressure and the driving of a fluid working medium in a fluid conveying system, particularly aiming at the problems of the existing electromagnetic valve type unloading valve with a time delay function, the utility model provides an isolation-free film time delay action electromagnetic unloading device, which aims at: the production cost of the electromagnetic unloading device is effectively reduced by reducing or even eliminating vulnerable parts of the traditional electromagnetic unloading valve with similar functions, and the working reliability of the electromagnetic unloading device is effectively improved. The utility model further provides an air compressor provided with the isolation-free film delay valve, and the air compressor aims to quickly unload the high back pressure condition in the target pipeline to a low back pressure working condition when the air compressor pauses air supply, and can delay closing of the unloading hole when the compressor is restarted so that the motor can be started normally under the low back pressure working condition.

The purpose of the utility model is realized in the following way: the electromagnetic unloading device comprises a valve seat body and an electromagnetic valve, wherein the electromagnetic valve comprises an actuating valve core and a return spring, and the actuating valve core can generate position movement or locking and stopping under the combined action of electromagnetic force of the electromagnetic valve and elastic force of the return spring; an input port and an output port are formed in the valve seat body or/and the electromagnetic valve, and a connecting channel for connecting the input port and the output port is formed in the valve seat body or/and the electromagnetic valve; the behavior states of two working conditions of communication or disconnection exist between the input port and the output port: when the valve core is used for blocking and closing the output port, the input port and the output port are in a disconnected state, and when the valve core is used for separating and opening the output port, the input port and the output port are in a communicated state; in addition, a delay conducting circuit which can control the electromagnetic valve and realize delay suction action when the electromagnetic valve is connected with electricity is arranged, and the logic of the delay conducting circuit for controlling the behavior of the electromagnetic valve is as follows: a) When the electromagnetic valve is powered on, the delay conducting circuit acts and enables the current intensity i flowing through the electromagnetic valve to be smaller than a threshold value io within a period delta t from the moment of power on of the electromagnetic valve, so that the actuating valve core cannot be driven to overcome the acting force of the return spring to generate attraction action, at the moment, the actuating valve core keeps a state of being separated from the output port under the leading action of the return spring, and then the input port on the valve seat body keeps a state of being communicated with the output port all the time within the period delta t; b) When the power-on time t of the electromagnetic valve meets the condition that t is more than or equal to delta t, the delay conducting circuit evolves into a conducting state, at the moment, the current intensity i flowing through the electromagnetic valve reaches a threshold value io which is i more than or equal to io and can drive the actuating valve core to overcome the acting force of the reset spring to generate the attraction action, and the attraction force generated by the electromagnetic valve is larger than the acting force of the reset spring so as to promote the actuating valve core to generate displacement and thus block and close the output port, and at the moment, the input port and the output port are in a disconnected state; c) When the electromagnetic valve is powered off, the actuating valve core loses electromagnetic force, so that the actuating valve core is separated from the output port under the action of the return spring, the output port is in an open state, and the input port and the output port are in a communicating state through the connecting channel and are kept in the state.

Further, the actuating valve core or/and the output port are provided with elastic sealing elements.

Further, the actuating valve core is provided with a sealing spring, one end of the sealing spring is abutted against the body of the actuating valve core, and the other end of the sealing spring is abutted against the elastic sealing element.

The delay conducting circuit comprises a bridge rectifier, a unidirectional silicon controlled rectifier, a capacitor, a first resistor, a second resistor and a third resistor, wherein one end of the first resistor is connected with the anode of the unidirectional silicon controlled rectifier and the anode of the bridge rectifier, the other end of the first resistor is simultaneously connected with one end of the capacitor, one end of the second resistor and one end of the third resistor, the other end of the third resistor is connected with the control electrode of the unidirectional silicon controlled rectifier, the cathodes of the unidirectional silicon controlled rectifier, the other end of the second resistor and the other end of the capacitor are mutually connected, and the three ends of the capacitor are connected with the cathode of the bridge rectifier.

Further, a diode is connected in series between the cathode of the unidirectional thyristor and the cathode of the bridge rectifier.

Further, a fourth resistor and a light emitting diode are connected in parallel to the electromagnetic valve, wherein the fourth resistor and the light emitting diode are in a serial layout.

An air compressor provided with an isolation-free film time-delay action electromagnetic unloading device, comprising the isolation-free film time-delay action electromagnetic unloading device.

Further, the air compressor comprises a motor, a pump head and a gas tank, wherein an exhaust pipe and an exhaust check valve are arranged between the pump head and the gas tank of the compressor, one end of the exhaust pipe is connected with the pump head, the other end of the exhaust pipe is connected with the exhaust check valve, the exhaust check valve is connected with the gas tank, and the time-delay action electromagnetic unloading device is arranged on the exhaust pipe or the pump head.

Further, the delay turn-on circuit sets the delay turn-on time Δt of the solenoid valve to be less than or equal to 3s.

Compared with the prior art, the utility model has the outstanding advantages that: the adopted time-delay action electromagnetic unloading device abandons the vulnerable part of the isolating diaphragm, so that on one hand, the hidden danger of the time-delay action electromagnetic unloading in the aspect of working reliability possibly occurring under the long-term operation working condition is eliminated, and on the other hand, the parts of the device are reduced, so that the manufacturing, the assembly and the detection become simpler, and the production cost is reduced. Finally, by assembling the time-delay action electromagnetic unloading device on the air compressor product, the air compressor system can realize quick unloading, and simultaneously can realize the time-delay closing unloading hole function when the compressor is started, thereby better solving the great and difficult problems that the traditional compressor system is difficult to realize quick unloading, high back pressure and smooth starting, energy consumption reduction and the like.

Description of the drawings:

FIG. 1 is a schematic diagram of the explosive assembly of one embodiment of an isolation free film time delay action electromagnetic unloader of the present utility model;

FIG. 2 is a schematic diagram of the embodiment of the time-lapse electromagnetic unloading device of FIG. 1 in a state in which the input port and the output port of the solenoid valve are in communication when the solenoid valve is energized but the energization time t satisfies the condition t < Δt or when the solenoid valve is de-energized;

FIG. 3 is a schematic diagram of the embodiment of the time-lapse electromagnetic unloading device shown in FIG. 1, wherein the output port of the electromagnetic valve is in a disconnected state when the electromagnetic valve is powered and the solenoid valve power-on time t satisfies the condition that t is greater than or equal to Δt;

FIG. 4 is a schematic layout of one embodiment of a delay pass circuit of the delay action electromagnetic unloader of the present utility model;

fig. 5 is a schematic layout diagram of an air compressor equipped with an electromagnetic unloading device without isolating film delay action.

The specific embodiment is as follows:

the utility model is further described below with reference to the specific examples, see fig. 1-5:

the electromagnetic unloading device without the isolation film time delay action comprises a valve seat body 1 and an electromagnetic valve 2, wherein the electromagnetic valve 2 comprises an action valve core 3 and a return spring 4 (shown in figures 1 to 3), and the action valve core 3 can generate position movement or locking and stopping under the combined action of electromagnetic force generated by the electromagnetic valve 2 and elastic force generated by the return spring 4; here, the positional movement means that the relative change in position or/and angle of the actuating valve element 3 with respect to the valve seat body 1 is generated, and it includes linear reciprocating movement of the actuating valve element 3 (in the case shown in fig. 2 to 3, the displacement form of the actuating valve element 3 is the case), or reciprocating rocking movement of the actuating valve element 3 (not shown in the drawings), or compound movement of the actuating valve element 3 in which linear reciprocation and rocking reciprocation are combined (not shown in the drawings); it should be noted that the valve seat body 1 of the present utility model may be a complete integral member (as shown in fig. 1) or may be composed of several parts together (not shown in the drawings); in addition, the solenoid valve 2 may also be composed of several parts (as shown in fig. 1 to 3), wherein the solenoid valve 2 may include, in addition to the above-mentioned actuating valve core 3 and a return spring 4, a magnetic seat body 2a, electronic components 2b, a cover 2c, a connection plate 2d, an air cap 2e, a valve core guide sleeve 2f, a fastener 2g, and other necessary accessories and the like (see fig. 1), and only one solenoid valve 2 is broadly labeled in fig. 2 to 3 as a reference (of course, the actuating valve core 3 and the return spring 4 of its functional components are also labeled for better clarity of explanation). The utility model has the greatest characteristics that: the valve seat body 1 and/or the electromagnetic valve 2 are provided with an input port 5 and an output port 6, and the valve seat body 1 and/or the electromagnetic valve 2 are provided with a connecting channel 7 for connecting the input port 5 and the output port 6, wherein the input port 5 and the output port 6 are in a communicating or disconnecting behavior state, namely, the fluid working media can be communicated or blocked between the fluid working media in the sense of delivering the fluid working media, namely: the input port 5 and the output port 6 are in a disconnected state when the output port 6 is closed by the action of the valve core 3, and the input port 5 and the output port 6 are in a communicated state when the output port 6 is opened by the action of the valve core 3; in addition, a delay conduction circuit A (see fig. 4) which can control the electromagnetic valve 2 and enable the electromagnetic valve 2 to realize delay suction action when being powered on is arranged, and logic of the delay conduction circuit A for controlling the behavior of the electromagnetic valve 2 is as follows: a) When the electromagnetic valve 2 is powered on, the delay conducting circuit A acts and enables the intensity i of the current flowing through the electromagnetic valve 2 to be smaller than the threshold value io within a period of time delta t from the moment of power on, so that the electromagnetic valve cannot drive the actuating valve core 3 to overcome the acting force of the return spring 4 to generate a sucking action, at the moment, the actuating valve core 3 keeps a state of being separated from the output port 6 under the leading action of the return spring 4, and then the input port 5 on the valve seat body 1 keeps a state of being communicated with the output port 6 all the time within the period delta t (as shown in fig. 2); b) When the power-on time t of the electromagnetic valve 2 meets the condition that t is more than or equal to deltat, the time-delay conducting circuit A is evolved into a conducting state, the current intensity i flowing through the electromagnetic valve 2 reaches a threshold value io which is i more than or equal to io and can drive the actuating valve core 3 to overcome the acting force of the return spring 4 to generate the sucking action, so that the sucking force generated by the electromagnetic valve 2 exceeds the acting force of the return spring 4 to cause the actuating valve core 3 to generate displacement and thereby block and close the output port 6, and the input port 5 and the output port 6 are in a disconnected state (shown in figure 3); c) When the solenoid valve 2 is de-energized, the actuating spool 3 loses electromagnetic force, and then the actuating spool 3 is disengaged from the output port 6 by the return spring 4 so that the output port 6 assumes an open state, and at this time, the input port 5 and the output port 6 assume a communicating state via the connecting passage 7 and maintain the state, which is equivalent to the case shown in fig. 2. It can be seen that, compared with the electromechanical time delay valve based on Bernoulli principle and the air compressor with the time delay valve and the pilot type electronic unloading valve and the compressor system with the unloading valve disclosed in CN113623421A, the utility model eliminates a vulnerable part isolating film, in other words, the utility model abandons the vulnerable part isolating film except the function of keeping time delay action, thus effectively eliminating the hidden trouble of the work reliability of the time delay action electromagnetic unloading under the long-term operation working condition, and reducing the parts of the device, thereby making, assembling and detecting the parts become simpler and being beneficial to reducing the production cost.

In order to ensure the tightness of the output port 6 in the off state so as to reduce the loss of the gas working medium in the normal working process, the utility model can be provided with an elastic sealing element 8 on the actuating valve core 3 and/or the output port 6, wherein the elastic sealing element 8 is arranged on the output port 6 in the situation shown in fig. 2 and 3. Further, a sealing spring 9 is arranged on the actuating valve core 3 to ensure more reliability in sealing; referring to fig. 2 and 3, one end of the sealing spring 9 abuts against the body of the actuating spool 3, and the other end of the sealing spring 9 abuts against the elastic seal 8.

A preferred embodiment of the delay pass circuit a of the present utility model is shown in fig. 4: the delay conducting circuit A comprises a bridge rectifier D, a unidirectional silicon controlled rectifier SCR, a capacitor C1, a first resistor R1, a second resistor R2 and a third resistor R3, wherein one end of the first resistor R1 is connected with an anode A of the unidirectional silicon controlled rectifier SCR and an anode of the bridge rectifier D, the other end of the first resistor R1 is simultaneously connected with one end of the capacitor C1, one end of the second resistor R2 and one end of the third resistor R3, the other end of the third resistor R3 is connected with a control electrode G of the unidirectional silicon controlled rectifier SCR, and three ends of a cathode K of the unidirectional silicon controlled rectifier SCR, the other end of the second resistor R2 and the other end of the capacitor C1 are mutually connected and are connected with a cathode of the bridge rectifier D. A diode D1 may be connected in series between the cathode K of the unidirectional SCR and the cathode of the bridge rectifier D, that is, the cathode K of the unidirectional SCR is connected to one end of the second resistor R2, the capacitor C1, and the cathode of the bridge rectifier D via the diode D1 (as shown in fig. 4). The functions of the electronic components of the utility model are respectively as follows: the bridge rectifier D has the task and function of rectifying external alternating current into direct current, the function of the unidirectional silicon controlled rectifier SCR is regulated and controlled according to the setting, namely, the current value capable of meeting the actuation action of the electromagnetic valve 2, namely, the displacement movement of the actuating valve core 3 can be generated, the function of the capacitor C1 is to accumulate charges at a certain speed and time according to the parameters, after the charges are accumulated to a certain extent, the voltage can be conducted to the control electrode G of the unidirectional silicon controlled rectifier SCR through the third resistor R3, the voltage can promote the unidirectional silicon controlled rectifier SCR to trigger and conduct, the function of the first resistor R1 is to form a voltage division function together with the second resistor R2 and limit the charge and discharge time of the capacitor C1, the function of the second resistor R2 is to form a voltage division function together with the first resistor R1 and simultaneously couple with the capacitor C1, and determine the charge and discharge time (namely, time constant) of the capacitor C1, the function of the third resistor R3 is to protect the unidirectional silicon controlled rectifier SCR, and the function of the diode D1 is also to protect the unidirectional silicon controlled rectifier SCR. The working principle of the delay turn-on circuit a in this embodiment is: (1) when the magnitude of the time Δt is determined by the parameter settings of the first resistor R1, the second resistor R2 and the capacitor C1 together within a period Δt from the moment the switch K is turned on, the control electrode G of the unidirectional thyristor SCR does not acquire a voltage value (the voltage value is related to the partial voltage of the first resistor R1 and the second resistor R2) sufficient to trigger the unidirectional thyristor SCR to turn on, and at this moment the current i flowing through the solenoid valve 2 is too small to generate the pull-in action, i.e. the current i at this moment is related to the first resistor R1 and the second resistor R2, i.e. the current i does not reach the threshold value io for driving the actuation valve 3 of the solenoid valve 2, i.e. i < io), but at the same time the capacitor C1 is charged from the moment the switch K is turned on to raise the voltage difference between the two ends of the unidirectional thyristor SCR (the charging raising rate is related to the parameters of the second resistor R2 and the capacitor C1), in other words the current i flowing through the unidirectional thyristor SCR is too small to generate the pull-in action, i.e. the current i is not yet able to drive the actuation valve 3 to generate a displacement action, i < i > i, i.e. the current i is able to reach the threshold value i < io of the pull-in action of the unidirectional thyristor 3, i.e. the current i is able to reach the threshold value i: the time delta t from the moment of closing the switch K to the moment of driving the actuating valve core 3 to be attracted is the delay action time of the delay conducting circuit of the embodiment, and is also the delay attracting time of the electromagnetic valve 2; (2) when the switch K is turned off, the current i flowing through the solenoid valve 2 is completely cut off, i.e. the current i flowing through the solenoid valve 2 is zero, and the solenoid valve 2 does not perform the actuation action, during which the charge originally remained in the capacitor C1 is mainly discharged through the second resistor R2 and externally connected to the other end of the ac power supply through the dc negative (-) end of the bridge rectifier D, so as to prepare for the next cycle operation of the solenoid valve 2. It should be noted that, in the present utility model, the state of the delay conducting circuit a has the following relationship with the operation condition of the electromagnetic valve: (1) when the delay turn-on circuit a is in a power-off state (when the switch K is turned off), or when the delay turn-on circuit a is in a power-on state but the accumulated time t from the moment when the switch K is turned on is smaller than a preset time period threshold Δt, the attraction force generated by the solenoid valve 2 is smaller than the force of the return spring 4, so that the actuation valve core 4 is kept stopped in a state of making the output port 6 open under the dominant of the force of the return spring 4 (see fig. 2); (2) when the time delay conducting circuit a is in the power-on state and the accumulated time t from the moment when the switch K is closed is greater than or equal to the preset time period threshold Δt, the attraction force generated by the solenoid valve 2 is greater than the force of the return spring 4, so that the actuating valve core 4 moves towards the output port 6 and remains parked in a state where the output port 6 is blocked under the dominant of the attraction force of the solenoid valve 2 (see fig. 3).

In order to improve the operation comfort, a fourth resistor R4 and a light emitting diode D2 (as shown in fig. 4) may be connected in parallel to the solenoid valve 2, wherein the fourth resistor R4 and the light emitting diode D2 are in a serial arrangement, which has the advantage of more intuitively observing the real-time operation state of the solenoid valve 2.

An air compressor equipped with an isolation-free film time-delay action electromagnetic unloading device comprises a motor 10, a pump head 11 and a gas tank 12, wherein a gas exhaust pipe 13 and a gas exhaust one-way valve 14 are arranged between the pump head 11 and the gas tank 12 of the compressor, one end of the gas exhaust pipe 13 is connected with the pump head 11, the other end of the gas exhaust pipe 13 is connected with the gas exhaust one-way valve 14, the gas exhaust one-way valve 13 is connected with the gas tank 12, high-pressure air output by the pump head 11 of the compressor is conveyed through the gas exhaust pipe 13 and enters the gas tank 12 through the gas exhaust one-way valve 14, and the time-delay action electromagnetic unloading device B is arranged on the gas exhaust pipe 13 or the pump head 11 (shown in figure 5). Furthermore, the delay turn-on time of the electromagnetic valve 2 set by the delay turn-on circuit A, namely the delay turn-on time of the electromagnetic valve 2, meets deltat which is less than or equal to 3s, and the reason for the arrangement is that the requirements of unloading and efficiency are both met.

Compared with the prior art, the utility model has the advantages that: the adopted isolation-free film time-delay action electromagnetic unloading device abandons the vulnerable part of the isolation diaphragm, so that on one hand, the hidden danger that the working reliability of the time-delay action electromagnetic unloading device is unstable under the long-term operation working condition is eliminated, and on the other hand, the parts of the device are reduced, and therefore, the manufacturing, the assembly and the detection of the device are simpler, and the production cost is reduced. Finally, by assembling the time-delay action electromagnetic unloading device on the air compressor product, the air compressor system can realize quick unloading, and simultaneously can realize the time-delay closing unloading hole function when the compressor is started, thereby better solving the great and difficult problems that the traditional compressor system is difficult to realize quick unloading, high back pressure and smooth starting, energy consumption reduction and the like.

The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of the present utility model, therefore: all equivalent changes in shape, structure and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (9)

1. The electromagnetic unloading device free of the isolation film delay action is characterized in that: the electromagnetic valve comprises a valve seat body and an electromagnetic valve, wherein the electromagnetic valve comprises an actuating valve core and a return spring, and the actuating valve core can generate position movement or locking position parking under the combined action of electromagnetic force of the electromagnetic valve and elastic force of the return spring; an input port and an output port are formed in the valve seat body or/and the electromagnetic valve, and a connecting channel for connecting the input port and the output port is formed in the valve seat body or/and the electromagnetic valve; the behavior states of two working conditions of communication or disconnection exist between the input port and the output port: when the valve core is used for blocking and closing the output port, the input port and the output port are in a disconnected state, and when the valve core is used for separating and opening the output port, the input port and the output port are in a communicated state; in addition, a delay conducting circuit which can control the electromagnetic valve and realize delay suction action when the electromagnetic valve is connected with electricity is arranged, and the logic of the delay conducting circuit for controlling the behavior of the electromagnetic valve is as follows: a) When the electromagnetic valve is powered on, the delay conducting circuit acts and enables the current intensity i flowing through the electromagnetic valve to be smaller than a threshold value io within a period delta t from the moment of power on of the electromagnetic valve, so that the actuating valve core cannot be driven to overcome the acting force of the return spring to generate attraction action, at the moment, the actuating valve core keeps a state of being separated from the output port under the leading action of the return spring, and then the input port on the valve seat body keeps a state of being communicated with the output port all the time within the period delta t; b) When the power-on time t of the electromagnetic valve meets the condition that t is more than or equal to delta t, the delay conducting circuit evolves into a conducting state, at the moment, the current intensity i flowing through the electromagnetic valve reaches a threshold value io which is i more than or equal to io and can drive the actuating valve core to overcome the acting force of the reset spring to generate the attraction action, and the attraction force generated by the electromagnetic valve is larger than the acting force of the reset spring so as to promote the actuating valve core to generate displacement and thus block and close the output port, and at the moment, the input port and the output port are in a disconnected state; c) When the electromagnetic valve is powered off, the actuating valve core loses electromagnetic force, so that the actuating valve core is separated from the output port under the action of the return spring, the output port is in an open state, and the input port and the output port are in a communicating state through the connecting channel and are kept in the state.

2. The isolation-free film time-lapse action electromagnetic unloading device according to claim 1, wherein: and an elastic sealing element is arranged on the actuating valve core or/and the output port.

3. The isolation-free film time-lapse action electromagnetic unloading device according to claim 2, wherein: the actuating valve core is provided with a sealing spring, one end of the sealing spring is abutted against the body of the actuating valve core, and the other end of the sealing spring is abutted against the elastic sealing element.

4. A non-isolated thin film time delay action electromagnetic unloading device according to any one of claims 1 to 3, wherein: the delay conducting circuit comprises a bridge rectifier, a unidirectional silicon controlled rectifier, a capacitor, a first resistor, a second resistor and a third resistor, wherein one end of the first resistor is connected with the anode of the unidirectional silicon controlled rectifier and the anode of the bridge rectifier, the other end of the first resistor is simultaneously connected with one end of the capacitor, one end of the second resistor and one end of the third resistor, the other end of the third resistor is connected with the control electrode of the unidirectional silicon controlled rectifier, and the three ends of the cathode of the unidirectional silicon controlled rectifier, the other end of the second resistor and the other end of the capacitor are mutually connected and are connected with the cathode of the bridge rectifier.

5. The isolation-free film time-lapse action electromagnetic unloading device according to claim 4, wherein: a diode is connected in series between the cathode of the unidirectional silicon controlled rectifier and the cathode of the bridge rectifier.

6. The isolation-free film time-lapse action electromagnetic unloading device according to claim 5, wherein: the electromagnetic valve is connected with a fourth resistor and a light-emitting diode in parallel, wherein the fourth resistor and the light-emitting diode are in a serial layout.

7. An air compressor provided with an isolation-free film time-delay action electromagnetic unloading device is characterized in that: an electromagnetic unloading device comprising the isolation-free film time delay action of any one of claims 1-6.

8. The air compressor equipped with an isolation-free film time-lapse action electromagnetic unloading device according to claim 7, wherein: the air compressor comprises a motor, a pump head and a gas tank, wherein an exhaust pipe and an exhaust one-way valve are arranged between the pump head and the gas tank of the compressor, one end of the exhaust pipe is connected with the pump head, the other end of the exhaust pipe is connected with the exhaust one-way valve, the exhaust one-way valve is connected with the gas tank, and the time-delay action electromagnetic unloading device is arranged on the exhaust pipe or the pump head.

9. The air compressor equipped with an isolation-free film time-lapse action electromagnetic unloading device according to claim 8, wherein: the delay conduction circuit sets the delay conduction time delta t of the electromagnetic valve conduction to be less than or equal to 3s.

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