Portable integrated airtight test device

Abstract

The present invention relates to a portable integrated airtightness testing device, which comprises a main body which integrates a micro bidirectional working air compressor, an inlet air supply low-pressure communicating shuttle valve, a safety valve, a pressure reducing valve, a stop valve, a digital pressure relay and a pressure gauge. The micro bidirectional working air compressor is arranged in the middle of the main body, an air cavity f of an air storage unit is arranged on the upper part of the main body, the air cavity f is connected to the digital pressure relay, the air cavities on both sides of the bidirectional piston of the micro bidirectional working air compressor are respectively connected to the air cavity f of the air storage unit through a one-way valve, the air cavities on both sides of the bidirectional piston are respectively connected to the air passages at both ends of the inlet air supply low-pressure communicating shuttle valve arranged on the upper part of the main body; the air cavity f is respectively connected to a safety valve with a forced opening and closing function installed on one side of the main body and a balanced pressure reducing valve installed on one side of the top of the main body, the balanced pressure reducing valve is connected to a stop valve with a discharge function installed on the other side of the main body, the inlet and outlet ends of the stop valve with a discharge function are respectively connected to pressure gauges, and compressed air is provided to the outside through a joint.

Description

Technical Field

[0001] The invention relates to a medium-low pressure airtightness test device, in particular to an integrated micro medium-low pressure airtightness test device. Background Art

[0002] The airtightness test device is a test device for testing the airtightness performance of components or devices, and is widely used in airtightness performance testing at the production site of air-controlled components or devices and airtightness performance testing during on-site maintenance in actual application scenarios. There are two main types of existing medium and low pressure airtightness test devices. One type is an airtightness test device that uses a centralized air supply system or a mobile medium and low pressure air machine to configure air control components such as pressure reducing valves and stop valves on site to form an air control circuit. The other type is an airtightness test device that designs an air machine, air control valves, etc. into a test bench. These two types of airtightness test devices have the disadvantages of low integration or inconvenience in testing the airtightness performance of equipment application sites. Moreover, the piston reciprocating micro air compressor currently used in the market is a one-way air outlet structure. For example, the bicycle with a micro air compressor disclosed in patent publication number CN201386544U and the portable micro air compressor disclosed in CN202091144U are all one-way air outlet structures, which are of low efficiency and cannot realize the compressed air function of the entire process of piston reciprocating motion. Therefore, it is necessary to design an integrated airtight test device that organically integrates a high-compression efficiency micro air compressor, an air control circuit, and is easy to operate and carry. Summary of the invention

[0003] In view of the defects existing in the prior art, the present invention aims to provide an integrated miniature medium and low pressure airtight test device, which organically integrates a miniature air compressor and an air control circuit into a main body, and rationally designs the valve structure in the miniature air machine and the air control circuit, so that it has the functions of two-way air outlet of the reciprocating piston miniature air machine, controllable compressed air output pressure, and independent operation.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a portable integrated airtightness test device, having a main body that integrates a micro bidirectional working air compressor, an imported air-supply low-pressure shuttle valve, a safety valve with a forced opening and closing function, a balanced pressure reducing valve, a stop valve with a release function, a digital pressure relay, and a pressure gauge. A micro bidirectional working air compressor is installed in the middle of the main body, and the micro bidirectional working air compressor is connected to a motor driven by a control signal through a connecting rod mechanism. An air cavity f of an air storage unit is provided on the upper part of the main body, and the air cavity f is connected to the digital pressure relay. The air cavities on both sides of the bidirectional piston of the micro bidirectional working air compressor are respectively connected to the air cavity f of the air storage unit through a one-way valve. The motor driven by the control signal drives the bidirectional piston reciprocating working cylinder in the micro bidirectional working air machine to work, and the compressed air medium is stored in the air cavity f of the air storage unit through two one-way valves; the air cavities on both sides of the bidirectional piston are respectively connected to the air cavity f of the air storage unit set on the main body. The air passages at both ends of the inlet air-supplementing low-pressure communicating shuttle valve are connected, and the inlet air-supplementing low-pressure communicating shuttle valve is used to supply air to the low-pressure chamber of the micro bidirectional working air compressor. The automatic start and stop function of the motor is realized by comparing the digital pressure relay with the input control signal, and the automatic air supply function is realized; the air cavity f is respectively connected to the safety valve with forced opening and closing function installed on one side of the main body and the balanced pressure-reducing valve installed on the top side of the main body, and the balanced pressure-reducing valve is connected to the stop valve with a discharge function installed on the other side of the main body. The inlet and outlet ends of the stop valve with a discharge function are respectively connected to pressure gauges, and compressed air of the required pressure is provided to the outside through a joint. The stop valve with a discharge function controls the air path entering the test object and is provided with a forced discharge and exhaust function. Compressed air is provided to the airtight test object through a joint. When the stop valve with a discharge function is closed, the sealing performance of the test object is judged by the pressure gauge to realize the overall function of the airtight test device.

[0005] Furthermore, the one-way valve is composed of a one-way valve seat, a steel ball, and a return spring, and the steel ball is connected to the one-way valve seat via the return spring.

[0006] Furthermore, the inlet air-supply low-pressure shuttle valve is composed of an intake screw plug, a tongue reed, and a push rod. The two tongue reeds are respectively placed on both sides of the airway and connected by the push rod. The airways on both sides are connected to the air cavities on both sides of the two-way piston through the airways in the intake screw plug.

[0007] Furthermore, a positioning pin is provided between the air inlet screw plug and the body.

[0008] Furthermore, the safety valve with forced opening and closing function is composed of a knob, a valve stem, an upper cover, a pressure-regulating spring, an air retaining ring, a valve core, and a valve body. The valve body is equipped with a valve core, the rear end of the valve core is connected to the knob through the valve stem, the valve stem is connected to the upper cover through a thread, the upper cover is connected to the valve body through a thread, and a pressure-regulating spring is connected to the outer sleeve of the valve stem, and the two ends of the pressure-regulating spring are respectively connected to the inner end surface of the upper cover and the outer end surface of the valve core. The working pressure of the safety valve is set by adjusting the compression amount of the pressure-regulating spring through the upper cover, and the knob controls the valve stem to drive the valve core to overcome the action of the pressure-regulating spring and force the sealing surface on the valve core to leave the valve body, thereby realizing the forced discharge and exhaust function.

[0009] Furthermore, a locking nut is threadedly connected on the outer periphery of the upper cover.

[0010] Furthermore, the balanced pressure reducing valve is composed of a handle, an adjusting rod, a pressure regulating spring, a diaphragm, a pressure reducing valve seat, a valve core, and a reset spring. A diaphragm is provided on the upper end surface of the pressure reducing valve seat, and the lower end surface of the diaphragm is connected to the valve core provided with a reset spring. The upper end surface of the diaphragm is connected to the adjusting rod and the handle through the spring seat and the pressure regulating spring. The output force of the pressure regulating spring is controlled by the handle to be transmitted to the diaphragm and compared with the pressure force of the medium at the outlet of the pressure reducing valve, thereby controlling the movement of the valve core.

[0011] Furthermore, the adjusting rod is threadedly connected with a locking nut.

[0012] Furthermore, the stop valve with discharge function is composed of a main valve core, an inner valve core, a large knob and a small knob. The inner thread of the main valve core is connected to the inner valve core, the outer end of the inner valve core is connected to the small knob, the outer end of the main valve core is connected to the large knob, and the main valve core is connected to the body through a thread; the large knob controls the movement of the main valve core to realize the on-off function of the inlet and outlet channels of the stop valve; the small knob controls the movement of the inner valve core to realize the on-off function of the inlet channel of the stop valve and the external environment, thereby realizing the forced discharge function of the inlet medium of the stop valve.

[0013] The beneficial effects of the present invention are:

[0014] Compared with the prior art, the airtight test device designed in the present invention integrates functional components such as an air compressor, a safety valve, a pressure reducing valve, a stop valve, a pressure relay, and a pressure gauge. It is an airtight test system that can operate independently. It only needs an external power supply to complete the airtight performance test, and can meet the airtight performance detection of the equipment application site. At the same time, the air compressor, safety valve, pressure reducing valve, stop valve and other components integrated in the airtight test device are not a simple superposition of existing products, but are organically integrated together on the basis of optimizing the existing individual functional components to form a complete portable integrated airtight test device. The air compressor in the airtight test device is designed as a two-way working structure, and the safety valve and the stop valve are designed with a forced discharge function. The pressure reducing valve adopts a balanced structure. The performance of these functional components has the advantages of high working efficiency and reliable performance, thereby ensuring the overall high performance of the airtight test device, which can meet the airtight test requirements of equipment in special test sites or on-site maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a main cross-sectional view of the structure of the portable integrated airtight testing device of the present invention;

[0016] Figure 2 yes Figure 1 Sectional view along AA;

[0017] Figure 3 yes Figure 2 Sectional view along BB;

[0018] Figure 4 yes Figure 3 Cross-sectional view along CC;

[0019] Figure 5 It is a schematic diagram of the portable integrated airtightness test device of the present invention;

[0020] Figure 6 It is a simplified structural diagram of a safety valve with a forced opening and closing function in a portable integrated airtightness test device of the present invention;

[0021] Figure 7 It is a simplified structural diagram of a balanced pressure reducing valve in a portable integrated airtightness test device of the present invention;

[0022] Figure 8 It is a simplified structural diagram of a stop valve with a discharge function in a portable integrated airtightness test device of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figures 1 to 4As shown, a portable integrated airtight test device includes a motor 1, a connecting rod mechanism 2, a body 3, an air intake plug 41, a tongue reed 42, a positioning pin 43, a push rod 44, a positioning pin 45, a tongue reed 46, an air intake plug 47, a piston 5, a cylinder cover 6, a one-way valve seat 71, a steel ball 72, a reset spring 73, a digital pressure relay 8, an air cavity cover 9, a one-way valve seat 101, a reset spring 102, a steel ball 103, a cylinder cover 11, a safety valve 12, a pressure reducing valve 13, a stop valve 14, a quick-change connector 15, a pressure gauge 16, and a pressure gauge 17. The body 3 is provided with air passages a, b, c and air cavities d, e, f.

[0025] like Figure 5 As shown, the working principle of the portable airtight test device of the present invention is as follows: the control signal drives the motor 1 to drive the two-way piston reciprocating working cylinder C1 in the micro two-way working air machine to work, and the compressed air medium is stored in the air storage unit A1, i.e., the air cavity f in the body 3, through the one-way valve V2.1 or V2.2. At the same time, the low-pressure shuttle valve V1 in the air compressor replenishes the low-pressure cavity of the cylinder C1, and the pressure detection element P1, i.e., the digital pressure relay 8, is compared with the input control signal to realize the automatic start and stop function of the motor and the automatic air supply function. Valve V4, i.e., the safety valve 12 with forced opening and closing function, prevents the compressed air pressure from being too high and is provided with a forced discharge and exhaust function to improve the safety of the device. The pressure is reduced to the working pressure required for the airtight test through valve V5, i.e., the balanced pressure reducing valve 13; the air path entering the test object is controlled by valve V6, i.e., the stop valve 14 with a release function, and is provided with a forced release and exhaust function; finally, compressed air is provided to the airtight test object through connector Q1, i.e., the quick-change connector 15; valve V6 is closed; and the sealing performance of the test object is judged by the pressure gauge P3 to realize the overall function of the airtight test device.

[0026] The micro two-way working air compressor is composed of a motor 1, a connecting rod mechanism 2, a body 3, a piston 5, a cylinder head 6, a digital pressure relay 8, an air cavity cover 9, an inlet air supply low pressure communicating shuttle valve, two one-way valves, etc., wherein the two one-way valves are respectively composed of a one-way valve seat 71, a steel ball 72, a reset spring 73 and a one-way valve seat 101, a reset spring 102, a steel ball 103, etc., and the inlet air supply low pressure communicating shuttle valve is composed of an intake screw plug 41, a tongue reed 42, a positioning pin 43, a push rod 44, a positioning pin 45, a tongue reed 46, an intake screw plug 47, etc. The motor 1 drives the connecting rod mechanism 2 to drive the piston 5 to compress the air in the air cavity d or the air cavity e, and the pressurized compressed air is stored in the air cavity f. When the piston 5 moves to the right, the air in the air chamber e is compressed, the air pressure rises, and the tongue reed piece 2 46 moves to the left under the action of the air pressure, blocking the airway c from the air intake a; the tongue reed piece 2 46 pushes the push rod 44 to move to the left, driving the free end of the tongue reed piece 1 42 to move to the left, ensuring the circulation of the air intake a and the airway b, allowing the outside air to freely enter the air chamber d; the compressed air in the air chamber e pushes the steel ball 2 103 away, and stores the compressed air in the air chamber f, establishing a compressed air power source. Conversely, when the piston 5 moves to the left, the air in the air chamber d is compressed, the airway b and the air intake a are cut off, the air intake a and the airway c are connected, and the compressed air enters the air chamber f from the air chamber d, realizing the reverse air supply function. The realization of the micro bidirectional working air compressor structure greatly improves the work efficiency.

[0027] like Figure 6 As shown, the safety valve 12 with forced opening and closing function is composed of a knob 121, a valve stem 122, an upper cover 123, a locking nut 124, a pressure regulating spring 125, an air retaining ring 126, a valve core 127, a valve body 128, etc. The compression amount of the pressure regulating spring 125 is adjusted by the upper cover 123 to set the working pressure of the safety valve. The knob 121 can control the valve stem 122 to drive the valve core 127 to overcome the action of the pressure regulating spring 125 and force the upper sealing surface of the valve core 127 to leave the valve body 128, thereby realizing the forced discharge and exhaust function.

[0028] like Figure 7As shown, the balanced pressure reducing valve 13 is composed of a body 3, a handle 131, a locking nut 132, an adjusting rod 133, a pressure regulating spring 134, a diaphragm 135, a pressure reducing valve seat 136, a valve core 137, a reset spring 138, etc. The output force of the pressure regulating spring 134 is controlled by the handle 131 to be transmitted to the diaphragm 135, and compared with the pressure force of the medium at the outlet of the pressure reducing valve, so as to control the movement of the valve core 137. When the outlet pressure reaches the set pressure, the valve core 137 moves upward to reduce the size of the valve port to maintain the outlet pressure not exceeding the set pressure. When the outlet pressure reaches the set pressure, the valve core 137 moves upward to reduce the size of the valve port to maintain the outlet pressure not exceeding the set pressure. When the pressure is less than the set pressure, the valve core 137 moves downward to increase the size of the valve port, increase the medium flow rate, and increase the outlet pressure to change towards the set pressure; by designing the diameter of the sealing surface formed by the valve core 137 and the pressure reducing valve seat 136 to be equivalent to the diameter of the lower end surface of the valve core 137 and the balance structure of the upper and lower parts of the valve core 137 to communicate with each other, the effective area of ​​the inlet medium and the outlet medium on the valve core 137 is basically the same, the medium force generated on the valve core is also basically the same, and it is less affected by the changes in the inlet and outlet medium pressures, thereby minimizing the impact of the changes in the inlet pressure and outlet pressure on the performance of the pressure reducing valve.

[0029] like Figure 8 As shown, the stop valve 14 with a discharge function is composed of a body 3, a main valve core 141, an inner valve core 142, a large knob 143, a small knob 144, etc. The large knob 143 controls the movement of the main valve core 141 to realize the on-off function of the inlet and outlet channels of the stop valve; the small knob 144 controls the movement of the inner valve core 142 to realize the on-off function of the inlet channel of the stop valve and the external environment, thereby realizing the forced discharge function of the inlet medium of the stop valve.

[0030] The present invention designs an integrated airtightness test device which has high integration, high compressed air efficiency, convenient output pressure medium control, is easy to carry and can operate independently.

[0031] The airtight test device is designed with functional components such as air compressor, safety valve, pressure reducing valve, stop valve, pressure relay, pressure gauge, etc. It is an airtight test system that can operate independently. It only needs an external power supply to complete the airtight performance test, which can meet the airtight performance test of the equipment application site. The air compressor in the airtight test device is designed as a two-way working structure, the safety valve and stop valve are designed with forced discharge function, and the pressure reducing valve is designed with a balanced structure. The performance of these functional components has the advantages of high working efficiency and reliable performance, thereby ensuring the overall high performance of the airtight test device.

[0032] The piston outlet structure in the micro air compressor is a two-way working structure, which makes full use of the full stroke of the piston reciprocating motion and greatly improves work efficiency. A safety valve is set on the air compressor outlet to set the system pressure and prevent the motor from overload damage. A pressure-adjustable pressure relay is set on the air compressor outlet, which can automatically control the start and stop of the motor through the electronic control feedback system to realize the automatic air supply function. A pressure chamber is set on the air compressor to meet the air supply or air replenishment function of the air tightness test, improve the stability of the air supply, and avoid frequent motor starting to increase the life of the device.

[0033] The safety valve in the airtight test device is designed with a structure with forced opening and closing functions. The valve stem can be controlled by the knob to drive the valve core to overcome the force of the pressure-adjusting spring and force the sealing surface on the valve core to leave the valve body, thereby realizing the forced discharge and exhaust function, meeting the emergency exhaust function of the device and improving the safety of the device.

[0034] The pressure reducing valve in the airtight test device is designed as a balanced pressure reducing structure. The diameter of the sealing surface formed by the valve core and the pressure reducing valve seat is designed to be equivalent to the diameter of the outlet of the lower end face of the valve core, and the upper and lower parts of the valve core are connected to each other. The effective area of ​​the inlet medium and the outlet medium on the valve core is basically the same, and the medium force generated on the valve core is also basically the same. It is less affected by the changes in the inlet and outlet medium pressures, which minimizes the impact of changes in the inlet pressure and outlet pressure on the performance of the pressure reducing valve and improves the pressure reducing performance.

[0035] The stop valve of the airtight test device is designed as a structure with a discharge function. The movement of the inner valve core is controlled by the knob to realize the on-off function of the stop valve inlet channel and the external environment, realize the forced discharge function of the inlet medium of the stop valve, and improve the emergency or forced exhaust performance of the device.

Claims

1. A portable integrated airtightness test device, having a main body integrating a micro two-way working air compressor, an inlet air supply low-pressure shuttle valve, a safety valve with a forced opening and closing function, a balanced pressure reducing valve, a stop valve with a discharge function, a digital pressure relay, and a pressure gauge, characterized in that: A micro bidirectional working air compressor is installed in the middle of the body, and the micro bidirectional working air compressor is connected to a motor driven by a control signal through a connecting rod mechanism. An air chamber f of an air storage unit is arranged on the upper part of the body, and the air chamber f is connected to a digital pressure relay. The air chambers on both sides of the bidirectional piston of the micro bidirectional working air compressor are connected to the air chamber f of the air storage unit through a one-way valve respectively. The motor is driven by the control signal to drive the bidirectional piston reciprocating working cylinder in the micro bidirectional working air compressor to work, and the compressed air medium is stored in the air chamber f of the air storage unit through two one-way valves; the air chambers on both sides of the bidirectional piston are respectively connected to the inlet air supply low pressure arranged on the upper part of the body. The air duct is connected, and the low-pressure chamber of the micro bidirectional working air compressor is supplemented with air by the imported air-supply low-pressure shuttle valve. The automatic start and stop function of the motor is realized by comparing the digital pressure relay with the input control signal, and the automatic air supply function is realized; the air cavity f is respectively connected to the safety valve with forced opening and closing function installed on one side of the body and the balanced pressure reducing valve installed on the top side of the body. The balanced pressure reducing valve is connected to the stop valve with discharge function installed on the other side of the body. The inlet and outlet ends of the stop valve with discharge function are respectively connected with pressure gauges, and compressed air of required pressure is provided to the outside through the joint. The stop valve with discharge function controls the air entering the test object The circuit is also provided with a forced discharge and exhaust function, and compressed air is provided to the airtight test object through the joint. When the stop valve with the discharge function is closed, the sealing performance of the test object is judged by the pressure gauge to realize the overall function of the airtight test device; the safety valve with forced opening and closing function is composed of a knob, a valve stem, an upper cover, a pressure regulating spring, an air retaining ring, a valve core, and a valve body. A valve core is installed in the valve body, and the rear end of the valve core is connected to the knob through the valve stem, and the valve stem is connected to the upper cover through a thread, and the upper cover is connected to the valve body through a thread. A pressure regulating spring is connected to the outer sleeve of the valve stem, and the two ends of the pressure regulating spring are respectively connected to the inner end face of the upper cover and the outer end face of the valve core. The compression amount of the pressure regulating spring is adjusted by the upper cover to set the safety The working pressure of the valve, the knob controls the valve stem to drive the valve core to overcome the action of the pressure regulating spring and force the sealing surface on the valve core to leave the valve body, thereby realizing the forced discharge and exhaust function; the stop valve with discharge function is composed of a main valve core, an inner valve core, a large knob and a small knob, the inner thread of the main valve core is connected to the inner valve core, the outer end of the inner valve core is connected to a small knob, the outer end of the main valve core is connected to a large knob, and the main valve core is connected to the body through a thread; the large knob controls the movement of the main valve core to realize the on-off function of the inlet and outlet channels of the stop valve; the small knob controls the movement of the inner valve core to realize the on-off function of the inlet channel of the stop valve and the external environment, thereby realizing the forced discharge function of the inlet medium of the stop valve.

2. The portable integrated airtightness test device according to claim 1, characterized in that: The one-way valve is composed of a one-way valve seat, a steel ball and a return spring, and the steel ball is connected to the one-way valve seat through the return spring.

3. The portable integrated airtightness test device according to claim 1, characterized in that: The inlet air-supply low-pressure shuttle valve is composed of an intake screw plug, a tongue reed, and a push rod. The two tongue reeds are respectively placed on both sides of the airway and connected by the push rod. The airways on both sides are connected to the air cavities on both sides of the two-way piston through the airways in the intake screw plug.

4. The portable integrated airtightness test device according to claim 3, characterized in that: A positioning pin is arranged between the air inlet screw plug and the body.

5. The portable integrated airtightness test device according to claim 1, characterized in that: The outer periphery of the upper cover is threadedly connected with a locking nut.

6. The portable integrated airtightness test device according to claim 1, characterized in that: The balanced pressure reducing valve is composed of a handle, an adjusting rod, a pressure regulating spring, a diaphragm, a pressure reducing valve seat, a valve core, and a reset spring. A diaphragm is provided on the upper end surface of the pressure reducing valve seat, and the lower end surface of the diaphragm is connected to the valve core provided with a reset spring. The upper end surface of the diaphragm is connected to the adjusting rod and the handle through a spring seat and a pressure regulating spring. The output force of the pressure regulating spring is controlled by the handle and transmitted to the diaphragm, and compared with the pressure force of the medium at the outlet of the pressure reducing valve, thereby controlling the movement of the valve core.

7. The portable integrated airtightness test device according to claim 6, characterized in that: The adjusting rod is threadedly connected with a locking nut.

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