CN109681660B - Switch valve for controlling on-off of power-on circuit of power air supply respirator - Google Patents

Switch valve for controlling on-off of power-on circuit of power air supply respirator Download PDF

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Publication number
CN109681660B
CN109681660B CN201811606736.8A CN201811606736A CN109681660B CN 109681660 B CN109681660 B CN 109681660B CN 201811606736 A CN201811606736 A CN 201811606736A CN 109681660 B CN109681660 B CN 109681660B
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China
Prior art keywords
opening
valve
hand wheel
closing hand
eccentric cam
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CN201811606736.8A
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Chinese (zh)
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CN109681660A (en
Inventor
张守政
李占贵
吕建设
黄锦
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Shanghai Asia Security Equipment Ltd By Share Ltd
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Shanghai Asia Security Equipment Ltd By Share Ltd
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Publication of CN109681660A publication Critical patent/CN109681660A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/04—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having cylindrical surfaces; Packings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/065—Construction of housing; Use of materials therefor of taps or cocks with cylindrical plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/60—Handles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

The invention discloses a switch valve with power-on and power-off functions for a power supply respirator, which comprises: the valve comprises an opening and closing hand wheel, a valve cover, an eccentric cam, a microswitch, a valve core, a valve body and an elastic piece. When the opening and closing hand wheel is positioned at a locking station, the limiting lug boss is correspondingly arranged in the notch, and the valve cover prevents the opening and closing hand wheel from rotating around the axis of the valve cover; when the opening and closing hand wheel is pressed along the axial direction, the elastic piece is compressed, the limiting boss is separated from the notch, so that the opening and closing hand wheel rotates around the axis of the opening and closing hand wheel, at the moment, the sliding block is abutted against the inside of the eccentric cam sliding groove and the valve core sliding groove to drive the eccentric cam and the valve core to synchronously rotate, and when the opening and closing hand wheel rotates to an opening station, the bulge part of the eccentric cam is synchronously rotated to the position of pressing the microswitch to enable the conduction of a power-on circuit to open the conveying channel; when the opening and closing hand wheel rotates to a closing station, the eccentric cam leaves the position of the microswitch, so that the power-on circuit is switched off to close the conveying channel.

Description

Switch valve for controlling on-off of power-on circuit of power air supply respirator
Technical Field
The invention relates to a switch valve, in particular to a switch valve used on a respirator.
Background
As a breathing protection device, the power air supply respirator can be applied to the fields of fire fighting, petroleum, chemical industry, heavy industry, sewage treatment, ships and the like, and is used for being worn by fast-response personnel, firemen, industrial workers and other personnel needing the breathing protection device in the dangerous environment which endangers life and health instantly.
The working principle of the prior art powered air-supply respirator is as follows:
when the air purifier works, the fan is driven to work by the power supply, and the filtered air is provided for workers by the fan through the air supply pipe to be not less than 95 LPM. In the use process, an operator needs to press a battery box switch button worn on the powered air supply respirator at the waist to turn on and off the fan. However, when the user wears the mask, the sight of the user is blocked, so that a sight blind area exists, and the time for accurately and rapidly pressing the switch key of the battery box is prolonged. In addition, prior art powered air-supplying respirators also suffer from insufficient intuitive operation, such as: when the power air supply respirator is combined with an air respirator for use, an air supply pipe of the power air supply respirator needs to be opened and closed, and the power air supply respirator in the prior art has no switch valve, so that the air supply pipe cannot be opened and closed when the power air supply respirator is combined with the air respirator for use, and the power air supply respirator is usually worn on the back, so that a fan cannot be conveniently opened and closed during operation.
In view of the foregoing, it would be desirable to have a switching valve that would make a powered blower respirator easier to use, would enable quick direct opening and closing of the blower duct and blower during operation, and would also be compatible with an air respirator.
Disclosure of Invention
The invention aims to provide a switch valve for controlling the on-off of a power-on circuit of a power air supply respirator, which has the power-on and off functions and can realize the free opening and closing of an air path of a power air supply device.
In order to achieve the above object, the present invention provides a switch valve for controlling on/off of an energization circuit of a powered air respirator, the switch valve comprising:
the starting and stopping hand wheel is provided with a force application part and a columnar part, and the outer wall of the columnar part is provided with a limiting boss protruding outwards in the radial direction and a sliding block protruding outwards in the radial direction;
the valve cover is sleeved on the periphery of the columnar part and is provided with a notch corresponding to the limiting boss;
the eccentric cam is arranged in the valve cover and is arranged below the valve cover in the axial direction of the opening and closing hand wheel, and an eccentric cam sliding groove for accommodating the sliding block is formed in the inner wall of the eccentric cam;
the microswitch is arranged in the valve cover and arranged beside the eccentric cam, and is used for conducting an electrifying circuit of the switch valve;
the valve core is arranged in the valve cover, a valve core sliding groove for accommodating the sliding block is formed in the inner wall of the valve core, and an opening is formed in the valve core;
the valve body is arranged in the valve cover and is arranged outside the valve core;
the elastic piece is arranged between the opening and closing hand wheel and the valve core;
when the opening and closing hand wheel is positioned at a locking station, the limiting boss is correspondingly arranged in the notch, and the valve cover prevents the opening and closing hand wheel from rotating around the axis of the valve cover; when the opening and closing hand wheel is pressed along the axial direction of the opening and closing hand wheel, the elastic piece is compressed, the limiting lug boss is separated from the notch, and therefore the opening and closing hand wheel can rotate around the axis of the opening and closing hand wheel; when the opening and closing hand wheel rotates around the axis of the opening and closing hand wheel, the sliding block abuts against the inside of the eccentric cam sliding groove and the inside of the valve core sliding groove to drive the eccentric cam and the valve core to synchronously rotate, when the opening and closing hand wheel rotates to an opening station, the protruding part of the eccentric cam is synchronously rotated to a position for pressing the microswitch to conduct a power-on circuit, and the opening of the valve core is aligned with the opening of the valve body to open the conveying channel of the switch valve; when the opening and closing hand wheel rotates to a closing station, the convex part of the eccentric cam is synchronously rotated to a position away from the micro switch so as to cut off the electrified circuit, and the opening of the valve core is not aligned with the opening of the valve body so as to close the conveying channel of the switch valve.
In the technical scheme of the invention, the starting and stopping hand wheel can be rotated around the axis of the starting and stopping hand wheel by pressing the starting and stopping hand wheel, so that the starting and stopping hand wheel can be switched between the locking station and the opening station, and the arrangement is favorable for avoiding misoperation caused by mistakenly touching the switch in the actual operation process, thereby better ensuring the safety of a user in use.
In addition, the switch valve with the on-off function for the power air supply respirator is simple and light in structure, realizes the on-off function, simultaneously solves the problem of freely switching the air path of the power air supply device, controls the weight and the space, reduces the head load of a user, and can be better used by the user, and is not easy to cause sight blind areas.
Further, in the switch valve for controlling the on-off of the power supply circuit of the powered air-supply respirator, the elastic piece comprises a spring.
Further, in the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator, the valve cover is arranged at the top of the valve core.
Further, in the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator, the microswitch is arranged on the valve cover.
Further, in the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator, the valve cover comprises a left half cover body and a right half cover body.
Further, in the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator, the columnar part of the opening and closing hand wheel is also provided with a guide edge protruding in the radial direction, and when the opening and closing hand wheel is pressed along the axial direction of the opening and closing hand wheel, the guide edge is pressed on the top surface of the eccentric cam.
Further, in the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator, a baffle plate is arranged on the valve cover, and the baffle plate is arranged as follows: when the opening and closing hand wheel rotates to the opening station or the closing station, the baffle prevents the opening and closing hand wheel from being rotated continuously.
Further, in order to improve the air tightness, in the switch valve for controlling the on-off of the power supply circuit of the power supply respirator, a sealing ring is arranged between the valve core and the valve body.
Furthermore, the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator also comprises a connecting hand wheel, wherein the connecting hand wheel is connected with the valve body, and the outer wall of the connecting hand wheel is provided with an external thread for connecting with a valve seat of a breathing mask.
Further, in order to improve the air tightness, in the switch valve for controlling the on-off of the power supply circuit of the power supply respirator, a sealing ring is arranged between the valve body and the connecting hand wheel.
The switch valve for controlling the on-off of the power supply circuit of the power supply respirator makes up the blank that no switch valve with the on-off function is applied to opening and closing the pipeline of the air supply pipe of the power supply respirator in China.
In addition, the switch valve for controlling the on-off of the power supply circuit of the power supply respirator rotates around the axis of the switch valve by pressing the opening and closing hand wheel, so that the opening and closing hand wheel can be switched between a locking station and an opening station, the arrangement can avoid misoperation caused by mistaken touch of the switch in the actual operation process, and the safety of a user in use can be better ensured.
In addition, the switch valve for controlling the on-off of the power supply circuit of the power supply respirator adopts the oval vent hole, so that the ventilation volume is larger than that of the prior art which adopts the round vent hole.
In some preferred embodiments, in view of gas tightness, a sealing ring is arranged between the valve core and the valve body and/or between the valve body and the connecting hand wheel, and in order to further improve the gas tightness, the sealing ring can adopt a composite injection process to ensure that the sealing ring cannot be extruded and dislocated to cause leakage when being opened and closed for multiple times, and even when the sealing ring has impurities or is damaged, the sealing ring can ensure that gas in the pipeline cannot leak.
Drawings
FIG. 1 is a schematic structural diagram of a switch valve for controlling the on-off of a power supply circuit of a powered air-supplying respirator according to an embodiment of the present invention.
FIG. 2 is an exploded view of the switch valve for controlling the on/off of the power supply circuit of the powered air respirator of the present invention in one embodiment.
Fig. 3 is a schematic structural diagram of an opening and closing hand wheel of the switching valve for controlling the on-off of the power supply circuit of the powered air supply respirator in one embodiment of the invention.
Fig. 4 is a schematic structural diagram of an opening and closing hand wheel at another viewing angle of the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator in one embodiment of the invention.
Fig. 5 is a schematic diagram of a right half mask body structure of a switch valve for controlling on-off of an energizing circuit of a powered air-supply respirator in one embodiment of the invention.
FIG. 6 is a schematic diagram of the left half mask body structure of the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator in one embodiment of the invention.
FIG. 7 is a schematic diagram of an eccentric cam structure of a switch valve for controlling the on-off of a power supply circuit of a powered air-supplying respirator according to an embodiment of the invention.
FIG. 8 is a schematic diagram of an eccentric cam configuration at another viewing angle of the switch valve for controlling the on-off of the power-on circuit of the powered air respirator of the present invention in one embodiment.
FIG. 9 is a schematic view of a microswitch of the present invention for controlling the on/off of the power supply circuit of the powered air respirator.
FIG. 10 is a schematic structural diagram of a valve core of a switch valve for controlling the on-off of a power supply circuit of a powered air-supply respirator according to an embodiment of the invention.
Fig. 11 is a schematic structural diagram of a valve core of a switch valve for controlling on-off of an energizing circuit of a powered air-supply respirator, under another view angle, in an embodiment.
FIG. 12 is a block diagram of a switch valve for controlling the on/off of the power supply circuit of the powered air respirator according to one embodiment of the present invention.
FIG. 13 illustrates the connection of the switch valve of the present invention to the face mask for controlling the on/off of the power circuit of the powered air respirator in one embodiment.
FIG. 14 illustrates the connection of the switch valve of the present invention to the face mask for controlling the on/off of the power circuit of the powered air respirator in one embodiment.
Detailed Description
The switch valve for controlling the on-off of the power supply circuit of the powered air respirator according to the present invention will be further described in the following with reference to the specific embodiments of the present invention and the attached drawings, but the description is not intended to limit the present invention.
FIG. 1 is a schematic structural diagram of a switch valve for controlling the on-off of a power supply circuit of a powered air-supplying respirator according to an embodiment of the present invention.
FIG. 2 is an exploded view of the switch valve for controlling the on/off of the power supply circuit of the powered air respirator of the present invention in one embodiment.
The overall structure of the switch valve for controlling the on-off of the power supply circuit of the powered air-supply respirator is described with reference to fig. 1 and 2. As shown in fig. 1 and 2, the on-off valve 1 includes: the opening and closing hand wheel 11 is provided with a force application part 111 and a columnar part 112, and a limiting boss 1121 which protrudes radially outwards and a first slider 1122 and a second slider 1123 which protrude radially outwards are arranged on the outer wall of the columnar part 112 (the first slider 1122 and the second slider 1123 refer to fig. 4); the valve cover 12 is sleeved on the periphery of the columnar portion 112, the valve cover 12 comprises a left half cover body 122 and a right half cover body 121, the left half cover body 122 and the right half cover body 121 are spliced to form the valve cover 12, and the valve cover 12 is provided with a valve cover notch 124 corresponding to the limiting boss 1121; the eccentric cam 13 is arranged in the valve cover 12 and is arranged below the opening and closing hand wheel 11 in the axial direction; the microswitch 14 is arranged in the valve cover 12 and beside the eccentric cam 13, and the microswitch 14 is set to be capable of conducting the electrifying circuit of the switch valve 1; the valve core 15 is arranged in the valve cover 12; the valve body 16 is arranged in the valve cover 12 and outside the valve core 15, the top of the valve core 15 is provided with a valve cover 153, and in the embodiment, the microswitch 14 is arranged on the valve cover 153; the elastic part 17 is arranged between the opening and closing hand wheel 11 and the valve core 15, and the position of the elastic part 17 can be prevented from moving randomly when the elastic part is compressed by arranging the limiting cylinder 171, so that the service life of the elastic part is greatly prolonged, and the elastic part 17 in the embodiment is a spring. In addition, in this embodiment, the switch valve 1 further includes a connecting handwheel 18, the connecting handwheel 18 is connected with the valve body 16, and an external thread for connecting with a valve seat of the breathing mask 2 (the structure of the breathing mask 2 can be seen in fig. 13) is provided on an outer wall of the connecting handwheel 18, so that the switch valve 1 is connected with the breathing mask 2. Further, a first seal 191 is provided between the cap 153 and the valve body 16, a second seal 192 is provided between the cap 153 and the valve body 15, a third seal 193 is provided between the valve body 15 and the valve body 16, and a fourth seal 194 and a fifth seal 195 are provided between the valve body 16 and the connecting hand wheel 18.
As for the specific structure of each component of the on-off valve 1, fig. 3 to 12 can be referred to.
Fig. 3 is a schematic structural diagram of an opening and closing hand wheel of the switching valve for controlling the on-off of the power supply circuit of the powered air supply respirator in one embodiment of the invention. Fig. 4 is a schematic structural diagram of an opening and closing hand wheel at another viewing angle of the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator in one embodiment of the invention.
As can be seen in conjunction with fig. 3 and 4, and with reference to fig. 1 as necessary, the outer wall of the cylindrical portion 112 of the opening and closing hand wheel 11 is provided with a radially outwardly projecting limit boss 1121 and first and second radially outwardly projecting blocks 1122 and 1123. In addition, the cylindrical part 112 of the opening and closing hand wheel 11 is provided with a guide edge 1124 protruding in the radial direction, and when the opening and closing hand wheel 11 is pressed along the axial direction, the guide edge 1124 is pressed on the top surface of the eccentric cam 13.
In the present embodiment, the starting hand wheel 11 has a petal-shaped external shape, but those skilled in the art may set the external shape thereof according to the specific conditions of the embodiments, for example, a cross-shaped, a straight-line-shaped, or a three-petal type hand wheel (it is needless to say that the number of petals may be selected without being limited to three petals).
Fig. 5 is a schematic diagram of a right half mask body structure of a switch valve for controlling on-off of an energizing circuit of a powered air-supply respirator in one embodiment of the invention. FIG. 6 is a schematic diagram of the left half mask body structure of the switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator in one embodiment of the invention.
As can be seen from fig. 5 and 6, the left half cover body 122 and the right half cover body 121 are both provided with a baffle 123 and a valve cover notch 124 corresponding to the limiting boss 1121, and the left half cover body 122 and the right half cover body 121 are fixedly connected by screws to form a cavity space 125 for accommodating the column portion 112 of the starting handwheel 11.
FIG. 7 is a schematic diagram of an eccentric cam structure of a switch valve for controlling the on-off of a power supply circuit of a powered air-supplying respirator according to an embodiment of the invention. FIG. 8 is a schematic diagram of an eccentric cam configuration at another viewing angle of the switch valve for controlling the on-off of the power-on circuit of the powered air respirator of the present invention in one embodiment.
As shown in fig. 7 and 8, the inner wall 131 of the eccentric cam 13 is provided with a first eccentric cam runner 1321 and a second eccentric cam runner 1322, which accommodate the first slider 1122 and the second slider 1123 to slide. The first eccentric cam slot 1321 has a convex section thereon, and the second eccentric cam slot 1322 has a concave section thereon.
FIG. 9 is a schematic view of a microswitch of the present invention for controlling the on/off of the power supply circuit of the powered air respirator.
As shown in fig. 9, the microswitch 14 is provided with a microswitch elastic piece 141.
The energizing circuit control of the switching valve in the present case will be described with reference to fig. 7 to 9:
when the convex section of the first eccentric cam chute 1321 extrudes the microswitch elastic sheet 141, the positive electrode and the negative electrode are contacted, and the switch valve 1 is electrified; when the eccentric cam 13 rotates, the inner concave section of the second eccentric cam chute 1322 is extruded to the microswitch shrapnel 141, at this time, the microswitch shrapnel 141 is opened, so that the positive electrode and the negative electrode are disconnected, and the switch valve 1 is not electrified.
FIG. 10 is a schematic structural diagram of a valve core of a switch valve for controlling the on-off of a power supply circuit of a powered air-supply respirator according to an embodiment of the invention. Fig. 11 is a schematic structural diagram of a valve core of a switch valve for controlling on-off of an energizing circuit of a powered air-supply respirator, under another view angle, in an embodiment.
As shown in fig. 10 and 11, one end of the valve core 15 in the radial direction is a vent end 152, and the shape is an oval opening. The outer side of the venting end 152 is provided with a compound injection colloid 150 to prevent gas leakage, and the venting end 152 can be overlapped with an elliptical opening of the inner cavity of the valve body to form gas passage venting. The other end of the valve core 15 in the radial direction is a gas-closing end 151 which is an oval concave platform, and the outside of the gas-closing end 151 is provided with a compound injection colloid 150 to prevent gas leakage, and gas cannot flow into the valve body from the gas-closing end 151. It should be noted that the use of an oval shape allows for greater ventilation than a circular shape.
FIG. 12 is a locking state diagram of the switch valve for controlling the on-off of the power supply circuit of the powered air respirator of the present invention.
As can be seen from fig. 1 and 12, when the starting handwheel 11 is pressed to rotate, when the valve core rotates to the ventilating end 152 to coincide with the inner cavity of the valve body, the pipeline of the blast pipe is opened to form a gas passage, and gas can flow, and the structure of the gas passage can be referred to fig. 1. When the air-tight end 151 is rotated, the channel is completely closed, and air cannot flow, and the structure can be referred to fig. 12, where a is the air-tight end 151 and B is the air-tight end 152. In addition, the inner wall of the spool on the spool 15 is provided with a first spool sliding groove 154 and a second spool sliding groove 155 for accommodating the first slider 1122 or the second slider 1123.
FIG. 13 illustrates the connection of the switch valve of the present invention to the face mask for controlling the on/off of the power circuit of the powered air respirator in one embodiment. FIG. 14 illustrates the connection of the switch valve of the present invention to the face mask for controlling the on/off of the power circuit of the powered air respirator in one embodiment.
As shown in fig. 13 and 14, the connecting handwheel 18 is provided with an external thread on its outer end surface, so that it can be connected with the breathing mask 2 by a screw connection.
The working principle of the switch valve with power on/off function of forced air respirator of the present invention is described with reference to fig. 1 to 14:
when the opening and closing hand wheel 11 is located at the locking station, the limiting boss 1121 is correspondingly arranged in the valve bonnet notch 124, and the valve bonnet 12 prevents the opening and closing hand wheel 11 from rotating around the axis of the opening and closing hand wheel 11; when the opening and closing hand wheel 11 is pressed along the axial direction, the elastic piece 17 is compressed, the limiting boss 1121 is disengaged from the valve bonnet notch 124, and therefore the opening and closing hand wheel 11 can rotate around the axis of the opening and closing hand wheel 11; when the opening and closing hand wheel 11 rotates around the axis of the opening and closing hand wheel 11, the sliding block 1122 abuts against the inner concave section of the second eccentric cam sliding groove 1322 and the first valve core sliding groove 154, the second sliding block 1123 of the opening hand wheel 11 abuts against the convex section of the first eccentric cam sliding groove 1321 and the second valve core sliding groove 155, the sliding block 1122 and the second sliding block 1123 drive the eccentric cam 13 and the valve core 15 to move correspondingly, and if the pressing condition is not available, the limiting boss 1121 of the opening hand wheel 11 abuts against the valve cover notch 124 of the valve cover 12 and cannot rotate.
When the guiding edge 1124 of the opening and closing hand wheel 11 presses downward to contact the inner wall 131 of the eccentric cam 13, the limiting boss 1121 of the starting hand wheel 11 may rotate counterclockwise, for example, 180 degrees, the slider 1122 abuts against the inner concave section of the second eccentric cam slot 1322 and the first spool slot 154154, meanwhile, the second slider 1123 of the starting hand wheel 11 abuts against the convex section of the first eccentric cam slot 1321 and the second spool slot 155, the slider 1122 and the second slider 1123 drive the eccentric cam 13 and the spool 15 to move 180 degrees counterclockwise, and at this time, when the ventilating end 152 of the spool 15 moves to overlap with the elliptical opening of the valve body 16, the passage cavity is opened. The inner wall 131 with the convex section of the first eccentric cam chute 1321 moves to the microswitch shrapnel 141, so that the positive and negative poles of the microswitch shrapnel 141 are contacted, the microswitch 14 is switched on the positive and negative poles of the battery of the fan and starts to work, and filtered air starts to be supplied in the pipeline for a user to use;
when a user does not need to supply air, the user presses the starting hand wheel by hand to enable the guide edge 1124 of the starting hand wheel 11 to be pressed downwards to be in contact with the inner wall 131, the limit boss 1121 of the starting hand wheel 11 can rotate 180 degrees clockwise, the slider 1122 of the starting hand wheel 11 abuts against the convex section of the first eccentric cam chute 1321 and the first valve core chute 154, the second slider 1123 of the starting hand wheel 11 abuts against the convex section of the first eccentric cam chute 1321 and the second valve core chute 155, the slider 1122 and the second slider 1123 drive the eccentric cam 13 and the valve core 15 to move 180 degrees clockwise, the air closing end 151 moves to be coincident with the oval opening of the valve body 16, at the moment, the channel is closed, air cannot flow, the inner wall 131 of the convex section of the first eccentric cam chute 1321 moves to the microswitch elastic sheet 141 to enable the positive and negative poles of the elastic sheet to be separated, so that the microswitch elastic sheet 141 and the electrode, so as to separate the positive and negative poles of the elastic sheet. At this time, the microswitch 14 circuit is closed, the fan of the powered air-supply respirator stops rotating, and the air source stops delivering. Therefore, the switch valve 1 can freely open and close the air passage of the power blower and has the power on-off function.
When the power supply is switched on, the fan of the power air feeder starts to rotate, and toxic air is filtered by the canister and then is transmitted into the mask through the air supply pipe. Otherwise, the pipeline of the air supply pipe of the power air supply respirator is closed, and the power supply of the fan is closed.
It should be noted that in some embodiments, the elastic member 17 may be selected to have good elastic stability and high fatigue life, the shape thereof may be cylindrical, and the cross section of the elastic member 17 may be circular or rectangular.
In the scheme, the sealing effect between the parts is realized through the elastic deformation of the corresponding sealing rings so as to ensure the air tightness, and the sealing rings can be high in hardness, wear-resistant and corrosion-resistant and can still normally work at the temperature of minus 40-80 ℃.
The starting hand wheel 11, the valve cover 12, the eccentric cam 13, the valve cover 153, the valve body 16, the valve core 15 and the connecting hand wheel 18 can be made of materials meeting the requirements of flame retardance, water resistance and static resistance.
In conclusion, the switch valve with the on-off function for the power supply respirator has the following advantages:
the technical scheme of the invention has double leakage-proof measures, when the sealing ring at the sealing end of the valve core and the composite injection sealing ring at the ventilation end of the valve core have impurities or are damaged due to the operation environment and long-time mechanical motion friction, and thus when the sealing ring at the position leaks gas, the sealing ring at the sealing position of the valve cover and the valve body and the sealing ring at the sealing position of the valve core and the valve body play a role in protecting the second layer, so that the first layer of gas can be effectively prevented from continuously leaking outwards, and the first layer of leaked gas is blocked in the cavity of the valve core; the first position of the sealing ring at the position of the connecting hand wheel and the valve body plays a role in damping, the second position plays a role in sealing, when the connecting hand wheel and the side end of the mask are connected in place by using, the position of the switch valve can be rotated according to the needs of a user, the comfortable angle of the user is achieved, and the first sealing ring plays a role in damping.
In addition, the limiting cylinders 171 are arranged on the inner side of the starting hand wheel and the inner side of the top of the valve core, so that the position of the spring can be prevented from moving randomly when the spring is compressed, and the service life of the spring is greatly prolonged.
In addition, the switch valve of the scheme makes up the blank that no switch valve which is applied to opening and closing the pipeline of the air supply pipe of the power air supply respirator and has the function of switching on and off electricity is provided in China, and the micro switch with a small volume is adopted, so that the whole switch valve is small in size, and meanwhile, the switch valve is controlled to the maximum in weight, and the head load of a user is reduced. And because the present case adopts the mode that the start hand wheel just can rotate in place to press through the switching mode, avoided the mistake to touch the switch and cause the switching-off and opening of ooff valve, greatly guarantee the security that the user used in the complex environment.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.

Claims (10)

1. A switch valve for controlling the on-off of an energized circuit of a powered air breathing apparatus, the switch valve comprising:
the starting and stopping hand wheel is provided with a force application part and a columnar part, and the outer wall of the columnar part is provided with a limiting boss protruding outwards in the radial direction and a sliding block protruding outwards in the radial direction;
the valve cover is sleeved on the periphery of the columnar part and is provided with a notch corresponding to the limiting boss;
the eccentric cam is arranged in the valve cover and is arranged below the valve cover in the axial direction of the opening and closing hand wheel, and an eccentric cam sliding groove for accommodating the sliding block is formed in the inner wall of the eccentric cam;
the microswitch is arranged in the valve cover and arranged beside the eccentric cam, and is used for switching on or off an electrified circuit of the power air supply respirator;
the valve core is arranged in the valve cover, and a valve core sliding groove for accommodating the sliding block is formed in the inner wall of the valve core;
the valve body is arranged in the valve cover and is arranged outside the valve core;
the elastic piece is arranged between the opening and closing hand wheel and the valve core;
when the opening and closing hand wheel is positioned at a locking station, the limiting boss is correspondingly arranged in the notch, and the valve cover prevents the opening and closing hand wheel from rotating around the axis of the valve cover; when the opening and closing hand wheel is pressed along the axial direction of the opening and closing hand wheel, the elastic piece is compressed, the limiting lug boss is separated from the notch, and therefore the opening and closing hand wheel can rotate around the axis of the opening and closing hand wheel; when the opening and closing hand wheel rotates around the axis of the opening and closing hand wheel, the sliding block abuts against the inside of the eccentric cam sliding groove and the inside of the valve core sliding groove to drive the eccentric cam and the valve core to synchronously rotate, when the opening and closing hand wheel rotates to an opening station, the protruding part of the eccentric cam is synchronously rotated to a position for pressing the microswitch to conduct a power-on circuit, and the opening of the valve core is aligned with the opening of the valve body to open the conveying channel of the switch valve; when the opening and closing hand wheel rotates to a closing station, the convex part of the eccentric cam is synchronously rotated to a position away from the micro switch so as to cut off the electrified circuit, and the opening of the valve core is not aligned with the opening of the valve body so as to close the conveying channel of the switch valve.
2. The switch valve for switching an electrical circuit of a powered air-supplying respirator of claim 1, wherein the resilient member comprises a spring.
3. The switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator as claimed in claim 1, wherein a valve cover is arranged on the top of the valve core.
4. The switch valve for switching on and off the power-on circuit of a powered air-supplying respirator of claim 3, wherein the microswitch is mounted on the valve cover.
5. The switch valve for switching on and off the power-on circuit of the powered air-supplying respirator as claimed in claim 1, wherein the valve housing comprises a left half housing and a right half housing.
6. The switch valve for controlling the on-off of the power-on circuit of the powered air-supplying respirator as claimed in claim 1, wherein the cylindrical part of the opening and closing hand wheel is further provided with a guide edge which protrudes radially, and when the opening and closing hand wheel is pressed along the axial direction of the opening and closing hand wheel, the guide edge is pressed on the top surface of the eccentric cam.
7. The switch valve for switching on and off the power-on circuit of the powered air-supplying respirator of claim 1, wherein the valve cover is provided with a baffle plate, and the baffle plate is arranged as follows: when the opening and closing hand wheel rotates to the opening station or the closing station, the baffle prevents the opening and closing hand wheel from being rotated continuously.
8. The switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator as claimed in claim 1, wherein a sealing ring is arranged between the valve core and the valve body.
9. The switch valve for controlling the on-off of the power-on circuit of the powered air supply respirator as claimed in any one of claims 1-7, further comprising a connecting hand wheel connected with the valve body, wherein the outer wall of the connecting hand wheel is provided with an external thread for connecting with a valve seat of a breathing mask of the powered air supply respirator.
10. The switch valve for controlling the on-off of the power supply circuit of the powered air supply respirator as claimed in claim 9, wherein a sealing ring is arranged between the valve body and the connecting hand wheel.
CN201811606736.8A 2018-12-27 2018-12-27 Switch valve for controlling on-off of power-on circuit of power air supply respirator Active CN109681660B (en)

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Application Number Priority Date Filing Date Title
CN201811606736.8A CN109681660B (en) 2018-12-27 2018-12-27 Switch valve for controlling on-off of power-on circuit of power air supply respirator

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5438980A (en) * 1993-01-12 1995-08-08 Puritan-Bennett Corporation Inhalation/exhalation respiratory phase detection circuit
DE102007031043B4 (en) * 2007-07-04 2014-04-10 B/E Aerospace Systems Gmbh Oxygen supply means
CN101839503B (en) * 2009-03-18 2012-03-21 广东万和新电气股份有限公司 Fixed-proportion regulated gas stove
CN103759306B (en) * 2014-02-06 2016-08-17 杨斌 Same-cavity mixing blowing-type gas stove
CN107246484A (en) * 2017-07-01 2017-10-13 广东沙贝特燃气科技有限公司 A kind of gas valve of cigarette machine linkage
CN207838053U (en) * 2018-01-22 2018-09-11 上海宝亚安全装备股份有限公司 A kind of combination type air respiratory protection system

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