An adjustable normally open solenoid valve for explosion-proof positive pressure cabinet

Abstract

The present invention discloses an adjustable normally open solenoid valve for explosion-proof positive pressure cabinet, which relates to the technical field of solenoid valves. It comprises a valve cavity, one side of the valve cavity is connected with an air inlet, the other side of the valve cavity is connected with an exhaust port, a valve core is arranged in the valve cavity, the valve cavity extends along the height direction of the solenoid valve, the valve core reciprocates in the valve cavity along the height direction of the solenoid valve, a pressure relief port for rapid discharge of high-pressure gas is arranged on the peripheral side wall of the valve cavity, and the exhaust port is connected to the pressure relief port. The present invention can solve the problem that the existing technical solution is not conducive to the simplification of the pipeline of the explosion-proof positive pressure cabinet.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to an adjustable normally open solenoid valve for an explosion-proof positive pressure cabinet. Background Art

[0002] With the rapid development of industries such as petrochemicals, metal smelting, and chemical pharmaceuticals, explosion-proof positive pressure cabinets are increasingly being used in system control. The existing explosion-proof positive pressure cabinet has two devices, an adjustable valve that is normally open, and a solenoid valve that is normally closed. When the product needs to pass through a high air pressure, the solenoid valve opens, which increases the pipeline of the explosion-proof cabinet and is not conducive to simplifying the pipeline of the explosion-proof positive pressure cabinet.

[0003] To solve the above problems, a Chinese patent named pneumatic control system for positive pressure explosion-proof cabinet with patent number 201520929341.7 was disclosed, which includes a main controller, a pressure difference detection switch, a pressure relief valve, and a pneumatic power switch, a ball valve, a filter pressure reducing valve, a throttle valve and a main chamber connected in sequence through an air pipe, and also includes a main chamber circuit on-off switch; the pressure difference detection switch is connected to the main controller signal, and one side of the pressure difference detection switch is located in the main chamber and the other side is located outside the main chamber; the pressure relief valve is arranged at the top of the main chamber; the main chamber circuit on-off switch is connected to the main controller signal and is connected to the control circuit line of the main chamber.

[0004] Although the above technical solution can automatically cut off the control circuit of the main chamber under low pressure to make it non-working, thus preventing harmful substances from entering the main chamber under low pressure to cause combustion and explosion, the pipeline is complex, which is not conducive to simplifying the pipeline of the explosion-proof positive pressure cabinet. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention discloses an adjustable normally open solenoid valve for an explosion-proof positive pressure cabinet, which can solve the problem that the prior art solution is not conducive to simplifying the pipeline of the explosion-proof positive pressure cabinet.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] An adjustable normally open solenoid valve for an explosion-proof positive pressure cabinet comprises a valve cavity, an air inlet is connected on one side of the valve cavity, an exhaust port is connected on the other side of the valve cavity, a valve core is arranged in the valve cavity, the valve cavity extends along the height direction of the solenoid valve, the valve core slides back and forth in the valve cavity along the height direction of the solenoid valve, a pressure relief port for rapid discharge of high-pressure gas is arranged on the peripheral side wall of the valve cavity, the exhaust port is connected to the pressure relief port, the valve core has a first position for closing the air inlet and the exhaust port, in the first position, the valve core is located at the bottom of the valve cavity, the valve core and the air inlet are abutted, the valve core has a second position for connecting the air inlet and the exhaust port and closing the air inlet and the pressure relief port, in the second position, the valve core and the air inlet are separated, the valve core is located between the air inlet and the pressure relief port, the valve core has a third position for connecting the air inlet and the pressure relief port, in the third position, the valve core is located at the top of the valve cavity.

[0008] A preferred technical solution is that the valve core includes a first part for closing the air inlet and a second part for closing the pressure relief port. In the projection of the height direction of the solenoid valve, the diameter of the first part is smaller than the diameter of the second part, and the diameter of the second part is smaller than or equal to the inner diameter of the valve cavity. In the height direction of the solenoid valve, the distance between the first part and the second part is greater than the height of the pressure relief port.

[0009] A further preferred technical solution is that a control chamber is arranged at the top of the valve chamber, a valve stem is connected to the valve core, the valve stem extends from the valve chamber to the control chamber, a coil is arranged in the control chamber, and a moving iron cooperating with the coil is arranged at the top of the valve stem.

[0010] A further preferred technical solution is that, in the first position, the first part abuts against the air inlet, the moving iron is located at the bottom of the control chamber, in the height direction of the solenoid valve, the moving iron is located below the coil, and the second part is located below the pressure relief port.

[0011] According to a further preferred technical solution, in the second position, the first part and the air inlet are separated, and in the height direction of the solenoid valve, the moving iron and the bottom of the coil are at the same height, and the second part and the bottom of the pressure relief port are at the same height.

[0012] According to a further preferred technical solution, in the third position, the first part and the air inlet are separated, and in the height direction of the solenoid valve, the moving iron and the top of the coil are at the same height, and the second part and the top of the pressure relief port are at the same height.

[0013] The present invention discloses an adjustable normally open solenoid valve for explosion-proof positive pressure cabinet, which has the following advantages:

[0014] The valve core has a first position for closing the air inlet and the air outlet, in which the valve core is located at the bottom of the valve cavity and the valve core abuts against the air inlet. The first position is a standby position of the valve core, and before the exhaust process begins, the valve core is pressed at the exhaust port under the action of gravity.

[0015] The valve core has a second position for connecting the air inlet and the air outlet and closing the air inlet and the pressure relief port. In the second position, the valve core is separated from the air inlet and the valve core is located between the air inlet and the pressure relief port. The first position is the permanent position of the valve core during the exhaust process. The valve core is opened immediately under the action of the gas to ensure that the solenoid valve remains in a normally open state.

[0016] The valve core has a third position for connecting the air inlet and the pressure relief port, in which the valve core is located at the top of the valve cavity. The third position is a quick pressure relief position of the valve core, and the valve core moves to the top of the valve cavity under the action of electromagnetic force, and high-pressure gas is discharged through the exhaust port and the pressure relief port at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0018] Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 is a cross-sectional view of an embodiment of the present invention in a first position;

[0020] Figure 2 is an enlarged view of the valve core in the embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of an embodiment of the present invention in a second position;

[0022] Figure 4 is a cross-sectional view of an embodiment of the present invention at a third position;

[0023] Figure 5 is a cross-sectional view of another embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0026] like Figures 1 to 4 As shown, an adjustable normally open solenoid valve for an explosion-proof positive pressure cabinet described in an embodiment of the present invention includes a valve cavity 1 formed inside a valve body, an air inlet 2 is connected on one side of the valve cavity 1, an exhaust port 3 is connected on the other side of the valve cavity 1, a valve core 5 is arranged in the valve cavity 1, the valve cavity 1 extends along the height direction of the solenoid valve, and the valve core 5 slides back and forth in the valve cavity 1 along the height direction of the solenoid valve to control the opening and closing of the air inlet 2 and the exhaust port 3.

[0027] In order to simplify the pipeline so as to complete the conventional pressure discharge process and the high-pressure pressure relief process in the same solenoid valve, a pressure relief port 4 for rapid discharge of high-pressure gas can be provided on the peripheral side wall of the valve cavity 1, and the exhaust port 3 is connected to the pressure relief port 4. The pressure relief port 4 extends along the height direction of the solenoid valve, and a plurality of the pressure relief ports 4 are arranged at intervals along the circumference of the solenoid valve to facilitate rapid pressure relief from multiple directions.

[0028] The valve core 5 has a first position for closing the air inlet 2 and the air outlet 3. In the first position, the valve core 5 is located at the bottom of the valve cavity 1, and the valve core 5 abuts against the air inlet 2. The first position is a standby position of the valve core 5. Before the exhaust process starts, the valve core 5 is pressed at the air outlet 3 under the action of gravity.

[0029] The valve core 5 has a second position for connecting the air inlet 2 and the air outlet 3 and closing the air inlet 2 and the pressure relief port 4. In the second position, the valve core 5 is separated from the air inlet 2, and the valve core 5 is located between the air inlet 2 and the pressure relief port 4. The first position is the permanent position of the valve core 5 during the exhaust process. The valve core 5 is opened immediately under the action of the gas to ensure that the solenoid valve remains in a normally open state.

[0030] The valve core 5 has a third position for connecting the air inlet 2 and the pressure relief port 4, and in the third position, the valve core 5 is located at the top of the valve cavity 1. The third position is a quick pressure relief position of the valve core 5, and the valve core 5 moves to the top of the valve cavity 1 under the action of the electromagnetic force, and the high-pressure gas is discharged through the exhaust port 3 and the pressure relief port 4 at the same time.

[0031] In order to realize the communication between the exhaust port 3 and the pressure relief port 4, the valve core 5 includes a first portion 51 for closing the air inlet 2 and a second portion 52 for closing the pressure relief port 4. In the projection of the height direction of the solenoid valve, the diameter of the first portion 51 is smaller than the diameter of the second portion 52, so that the valve core 5 closes the pressure relief port 4 in the second position and connects the air inlet 2 and the exhaust port 3. In the height direction of the solenoid valve, the distance between the first portion 51 and the second portion 52 is greater than the height of the pressure relief port 4, so that the valve core 5 connects the exhaust port 3 and the pressure relief port 4 in the third position.

[0032] It can be understood that in this embodiment, the diameter of the second portion 52 is equal to the inner diameter of the valve cavity 1, so that the valve core 5 can completely close the pressure relief port 4 in the second position, thereby improving the sealing performance of the solenoid valve. Figure 5 As shown, in another embodiment, the diameter of the second portion 52 is smaller than the inner diameter of the valve cavity 1, so that the valve core 5 is partially connected to the pressure relief port 4 in the second position, thereby improving the pressure relief performance under high pressure conditions and protecting the normal operation of the solenoid valve.

[0033] In order to control the opening and closing of the pressure relief port 4, a control chamber 8 may be provided at the top of the valve chamber 1, a valve stem 6 may be connected to the valve core 5, the valve stem 6 may extend from the valve chamber 1 to the control chamber 8, a coil 9 may be provided at the control chamber 8, and a moving iron 7 may be provided at the top of the valve stem 6 to cooperate with the coil 9. During the process of increasing gas pressure in the solenoid valve, the valve core 5 may continuously rise to the third position and open the pressure relief port 4. When the pressure relief port 4 needs to be closed, the coil 9 may be energized and apply a downward force to the valve core 5, so that the valve core 5 may return to the second position and close the pressure relief port 4.

[0034] Specifically, in the first position, the solenoid valve is on standby. The first portion 51 abuts against the air inlet 2 to close the air inlet 2. The moving iron 7 is located at the bottom of the control chamber 8. In the height direction of the solenoid valve, the moving iron 7 is located below the coil 9. At this time, even if the coil 9 is energized, it will not have any effect on the moving iron 7. The second portion 52 is located below the pressure relief port 4 to close the pressure relief port 4.

[0035] Specifically, in the second position, the solenoid valve exhausts air. The first part 51 is separated from the air inlet 2 to connect the air inlet 2 and the exhaust port 3. In the height direction of the solenoid valve, the moving iron 7 and the bottom of the coil 9 are at the same height, so that the coil 9 can be powered on at any time to control the moving iron 7. The second part 52 and the bottom of the pressure relief port 4 are at the same height, and the pressure relief port 4 remains closed.

[0036] Specifically, in the third position, the solenoid valve releases pressure. The first part 51 is separated from the air inlet 2, and in the height direction of the solenoid valve, the moving iron 7 and the top of the coil 9 are at the same height, and the second part 52 and the top of the pressure relief port 4 are at the same height, so that the pressure relief port 4 is opened to achieve rapid pressure relief.

[0037] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0038] Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0039] Without more constraints, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. 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. An adjustable normally open solenoid valve for explosion-proof positive pressure cabinet, comprising a valve cavity, one side of the valve cavity is connected to an air inlet, the other side of the valve cavity is connected to an exhaust port, and a valve core is arranged in the valve cavity, characterized in that: The valve cavity extends along the height direction of the solenoid valve, the valve core slides back and forth in the valve cavity along the height direction of the solenoid valve, a pressure relief port for rapid discharge of high-pressure gas is provided on the peripheral side wall of the valve cavity, the exhaust port is connected to the pressure relief port, the valve core has a first position for closing the air inlet and the exhaust port, in the first position, the valve core is located at the bottom of the valve cavity, the valve core and the air inlet are abutted, the valve core has a second position for connecting the air inlet and the exhaust port and closing the air inlet and the pressure relief port, in the second position, the valve core and the air inlet are separated, the valve core is located between the air inlet and the pressure relief port, the valve core has a third position for connecting the air inlet and the pressure relief port, in the third position, the valve core is located at the top of the valve cavity; The valve core includes a first part for closing the air inlet and a second part for closing the pressure relief port. In the projection of the solenoid valve in the height direction, the diameter of the first part is smaller than the diameter of the second part, the diameter of the second part is smaller than or equal to the inner diameter of the valve cavity, and in the height direction of the solenoid valve, the distance between the first part and the second part is greater than the height of the pressure relief port. A control chamber is arranged at the top of the valve chamber, a valve stem is connected to the valve core, the valve stem extends from the valve chamber to the control chamber, a coil is arranged in the control chamber, and a moving iron matched with the coil is arranged at the top of the valve stem; In the first position, the first part is in contact with the air inlet, the moving iron is located at the bottom of the control chamber, the moving iron is located below the coil in the height direction of the solenoid valve, and the second part is located below the pressure relief port; In the second position, the first part is separated from the air inlet, in the height direction of the solenoid valve, the moving iron and the bottom of the coil are at the same height, and the second part and the bottom of the pressure relief port are at the same height.

2. The adjustable normally open solenoid valve for explosion-proof positive pressure cabinet according to claim 1 is characterized in that: In the third position, the first portion is separated from the air inlet, and in the height direction of the solenoid valve, the moving iron and the top of the coil are at the same height, and the second portion and the top of the pressure relief port are at the same height.

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