Low-pressure alarm valve and breathing equipment

Abstract

The utility model relates to a low-pressure alarm valve and breathing equipment. The low-pressure alarm valve comprises a valve body, a piston and an elastic piece. Wherein a main air inlet channel, a main cavity communicated with the air inlet channel, a first air leakage channel and a second air leakage channel are arranged in the valve body; the piston is arranged in the main cavity and divides the main cavity into a high-pressure cavity and a low-pressure alarm cavity which is not communicated with the high-pressure cavity, the high-pressure cavity is communicated with the main air inlet channel, one end of the first air leakage channel is communicated with the main air inlet channel, the other end of the first air leakage channel can be communicated with the low-pressure alarm cavity, and one end of the second air leakage channel is communicated with the low-pressure alarm cavity; the elastic piece elastically abuts against the side, back on to the high-pressure cavity, of the piston, and the piston can move to a first position and a second position under the action of air pressure; at the first position, the first air leakage channel cannot be communicated with the second air leakage channel through the low-pressure alarm cavity; at the second position, the first air leakage channel can be communicated with the second air leakage channel through the low-pressure alarm cavity.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a low-pressure alarm valve and a respiratory device. Background Art

[0002] In modern clinical medicine, respiratory equipment, as an effective means of artificially replacing spontaneous ventilation function, has been widely used in respiratory failure caused by various reasons, anesthesia respiratory management during major surgery, respiratory support therapy and emergency resuscitation, and occupies a very important position in the field of modern medicine.

[0003] However, some respiratory devices lack a low-pressure alarm function when supplying oxygen. If the oxygen pressure is too low during supply, it may affect the patient's breathing. In addition, due to the external dimensions of existing respiratory devices, the gas path components need to be arranged inside the gas path as much as possible, and the internal space is limited, which also puts higher requirements on the introduction of the low-pressure alarm function module.

[0004] BACKGROUND OF THE PRESENT APPLICATION The above information disclosed is only for understanding the background of the concept of the present application and may contain information that does not constitute the prior art. Utility Model Content

[0005] Based on this, in order to solve the above problems, it is necessary to provide a low pressure alarm valve and a breathing device.

[0006] A low pressure alarm valve, comprising:

[0007] A valve body, wherein a main air inlet passage, a main chamber connected to the air inlet passage, a first air leakage passage and a second air leakage passage are provided in the valve body;

[0008] A piston, wherein the piston is disposed in the main chamber and divides the main chamber into a high-pressure chamber and a low-pressure alarm chamber that is not connected to the high-pressure chamber, the high-pressure chamber is connected to the main air inlet passage, one end of a first air leakage passage is connected to the main air inlet passage, the other end of the first air leakage passage can be connected to the low-pressure alarm chamber, one end of the second air leakage passage is connected to the low-pressure alarm chamber, the other end of the second air leakage passage is penetrated through the valve body and a air leakage port is formed on the surface of the valve body; and

[0009] An elastic member, wherein the elastic member elastically abuts against a side of the piston facing away from the high-pressure chamber, and the piston can move to a first position and a second position under the action of air pressure; when the air pressure value in the high-pressure chamber is higher than or equal to a predetermined air pressure value, the piston can overcome the elastic member and move to the first position under the action of air pressure to block the first air leakage channel, and the first air leakage channel cannot be connected to the second air leakage channel through the low-pressure alarm chamber; when the air pressure value in the high-pressure chamber is lower than the predetermined air pressure value, the piston can compress the high-pressure chamber under the elastic action of the elastic member and move to the second position, so that the first air leakage channel can be connected to the low-pressure alarm chamber, and connected to the second air leakage channel through the low-pressure alarm chamber.

[0010] The above-mentioned low-pressure alarm valve includes at least the following beneficial effects: its main air inlet can input oxygen and other gases, and the gas in the main air inlet preferentially enters the high-pressure chamber. If the air pressure value in the high-pressure chamber is higher than or equal to the predetermined air pressure value, the piston can overcome the elastic member and move to the first position under the action of air pressure to block the first air leakage channel, and the first air leakage channel cannot be connected to the second air leakage channel through the low-pressure alarm chamber, that is, the alarm function is not triggered. If the air pressure value in the high-pressure chamber is lower than the predetermined air pressure value, the piston can compress the high-pressure chamber under the elastic action of the elastic member and move to the second position, so that the first air leakage channel can be connected to the low-pressure alarm chamber, and connected to the second air leakage channel through the low-pressure alarm chamber. At this time, a small part of the gas in the main air channel can be diverted into the first air leakage channel, and then discharged from the air leakage port of the second air leakage channel through the low-pressure alarm chamber, realizing a sound alarm, thereby prompting the user that the air intake rate and internal air pressure of the valve body are insufficient. If the air intake rate of the main airway and the air pressure value of the high-pressure chamber are subsequently increased until the air pressure value in the high-pressure chamber is higher than or equal to the predetermined air pressure value, the piston can be pushed up again under the action of the air pressure in the high-pressure chamber, that is, the piston overcomes the elastic force of the elastic part until it moves to the first position, blocking the first air leakage channel again, thereby stopping the alarm.

[0011] In one embodiment, the low-pressure alarm valve further includes a sealing ring sleeved on the piston, the outer peripheral surface of the piston is spaced apart from the inner peripheral surface of the main chamber, and the sealing ring abuts against the inner peripheral surface of the main chamber and the outer peripheral surface of the piston to separate the main chamber into the high-pressure chamber and the low-pressure alarm chamber. The sealing ring can seal and separate the high-pressure chamber from the low-pressure alarm chamber to prevent the high-pressure chamber from leaking into the low-pressure alarm chamber, which causes the low-pressure alarm valve to always be in an alarm state.

[0012] In one embodiment, the outer peripheral surface of the piston is further provided with a limiting rib, and each of the sealing rings is sandwiched between two limiting ribs in the axial direction of the piston to limit the movement of the sealing ring in the axial direction of the piston. The limiting rib can prevent the sealing ring from being offset relative to the piston during the movement of the piston.

[0013] In one embodiment, the limiting ribs extend in a ring shape along the circumference of the sealing ring. The ring-shaped limiting ribs are matched with the ring-shaped sealing ring, which can achieve a better limiting effect.

[0014] In one embodiment, the sealing ring is provided in plurality, and the plurality of sealing rings are arranged at intervals along the axial direction of the piston.

[0015] In one embodiment, a limiting groove is provided on the side of the piston facing away from the high-pressure chamber, and one end of the elastic member extends into the limiting groove and elastically abuts against the groove wall of the limiting groove. The groove wall of the limiting groove can limit the elastic member extending therein to prevent the elastic member from bending and position shifting.

[0016] In one embodiment, the elastic member is a compression spring.

[0017] In one embodiment, the cross-sectional area of ​​the air inlet passage is larger than the cross-sectional area of ​​the first air leakage passage. Such a structural setting allows the gas to flow mainly to the high-pressure chamber. When the alarm function is turned on, if the alarm function is to be turned off, the air pressure in the high-pressure chamber needs to be quickly increased to lift the piston to the first position. Therefore, most of the gas needs to flow to the high-pressure chamber, and a small part can flow to the low-pressure alarm chamber and the second air leakage passage through the first air leakage passage when an alarm is required.

[0018] In one of the embodiments, the low-pressure alarm valve further includes a quick-connect plug inserted into the surface of the valve body, and the quick-connect plug is used to communicate with the main air intake duct to achieve air intake.

[0019] In one of the embodiments, the low-pressure alarm valve further includes a gland, which is embedded in the front surface of the valve body, and the elastic member elastically abuts between the gland and the piston.

[0020] In one embodiment, the piston is threadedly connected to the valve body and can adjust the elastic abutment force of the elastic member on the piston. By adjusting the depth of the gland screwed in, the squeezing force between the gland and the elastic member can be adjusted, thereby changing the elastic abutment force of the elastic member on the piston, and then changing the air pressure in the high-pressure chamber to lift the piston and move the required air pressure value. It can be understood that the deeper the gland is screwed, the greater the degree of compression of the elastic member, and the greater the elastic abutment force of the elastic member on the piston, which is equivalent to lowering the predetermined air pressure value and making it easier to trigger the alarm; conversely, the shallower the gland is screwed, the smaller the degree of compression of the elastic member, and the smaller the elastic abutment force of the elastic member on the piston, which is equivalent to increasing the predetermined air pressure value.

[0021] In one embodiment, the piston is provided with a protruding portion at one end facing the high-pressure chamber, and the protruding portion is used to abut against the valve body to maintain the minimum volume of the high-pressure chamber. Such a structural setting can prevent the piston from directly filling the entire high-pressure chamber under the action of the elastic member when the air pressure in the high-pressure chamber is too low, resulting in the inability of the gas in the main airway to enter the high-pressure chamber. In other words, it is necessary to ensure that there is always a certain amount of space in the high-pressure chamber to receive the incoming gas, until the air pressure value is higher than or equal to the predetermined air pressure value, and then the piston is lifted to turn off the alarm function.

[0022] The present application also relates to a breathing apparatus, which comprises a low-pressure alarm valve as described in any of the above embodiments.

[0023] Since the breathing apparatus includes the low-pressure alarm valve as described in any of the above embodiments, the breathing apparatus also includes at least the beneficial effects of the low-pressure alarm valve: the main air inlet of the low-pressure alarm valve can be fed with oxygen and other gases, and the gases in the main air inlet preferentially enter the high-pressure chamber. If the air pressure value in the high-pressure chamber is higher than or equal to the predetermined air pressure value, the piston can overcome the elastic member and move to the first position under the action of the air pressure to block the first air leakage channel, and the first air leakage channel cannot be connected to the second air leakage channel through the low-pressure alarm chamber, that is, the alarm function is not triggered. If the air pressure value in the high-pressure chamber is lower than the predetermined air pressure value, the piston can compress the high-pressure chamber under the elastic action of the elastic member and move to the second position, so that the first air leakage channel can be connected to the low-pressure alarm chamber, and connected to the second air leakage channel through the low-pressure alarm chamber. At this time, a small part of the gas in the main airway can be diverted into the first air leakage channel, and then discharged from the air leakage port of the second air leakage channel through the low-pressure alarm chamber, realizing a sound alarm, thereby prompting the user that the air intake rate and internal air pressure of the valve body are insufficient. If the air intake rate of the main airway and the air pressure value of the high-pressure chamber are subsequently increased until the air pressure value in the high-pressure chamber is higher than or equal to the predetermined air pressure value, the piston can be pushed up again under the action of the air pressure in the high-pressure chamber, that is, the piston overcomes the elastic force of the elastic part until it moves to the first position, blocking the first air leakage channel again, thereby stopping the alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a low-pressure alarm valve provided in one embodiment of the present application.

[0026] Figure 2 A cross-sectional view of a low-pressure alarm valve provided in one embodiment of the present application.

[0027] Figure 3 Another cross-sectional view of a low-pressure alarm valve provided according to an embodiment of the present application.

[0028] Figure 4 Another cross-sectional view of a low-pressure alarm valve provided according to an embodiment of the present application.

[0029] Figure 5 An explosion diagram of a low-pressure alarm valve provided in accordance with an embodiment of the present application.

[0030] Reference numerals:

[0031] 10. Low-pressure alarm valve; 100. Valve body; 110. Main air inlet; 120. Main chamber; 121. High-pressure chamber; 122. Low-pressure alarm chamber; 131. First air release channel; 132. Second air release channel; 1321. Air release port; 200. Piston; 210. Limiting rib; 220. Limiting groove; 230. Lifting protrusion; 300. Elastic member; 400. Sealing ring; 500. Quick-connect plug; 600. Pressure cover. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5In some embodiments, the present application provides a low-pressure alarm valve 10, which includes a valve body 100, a piston 200 and an elastic member 300. The valve body 100 is provided with a main air inlet 110, a main chamber 120 connected to the air inlet, a first air leakage channel 131 and a second air leakage channel 132; the piston 200 is arranged in the main chamber 120 and divides the main chamber 120 into a high-pressure chamber 121 and a low-pressure alarm chamber 122 which is not connected to the high-pressure chamber 121, the high-pressure chamber 121 is connected to the main air inlet 110, one end of the first air leakage channel 131 is connected to the main air inlet 110, the other end of the first air leakage channel 131 can be connected to the low-pressure alarm chamber 122, one end of the second air leakage channel 132 is connected to the low-pressure alarm chamber 122, the other end of the second air leakage channel 132 is penetrated through the valve body 100 and a air leakage port 1321 is formed on the surface of the valve body 100. The elastic member 300 elastically abuts against the side of the piston 200 facing away from the high pressure chamber 121, and the piston 200 can move to the first position and the second position under the action of gas pressure. Figure 2 As shown, when the air pressure value in the high pressure chamber 121 is higher than or equal to the predetermined air pressure value, the piston 200 can overcome the elastic member 300 under the action of air pressure and move to the first position to block the first air leakage channel 131, and the first air leakage channel 131 cannot communicate with the second air leakage channel 132 through the low pressure alarm chamber 122. Figure 3 and Figure 4 As shown, when the air pressure value in the high-pressure chamber 121 is lower than the predetermined air pressure value, the piston 200 can compress the high-pressure chamber 121 under the elastic action of the elastic member 300 and move to the second position, so that the first air leakage channel 131 can be connected with the low-pressure alarm chamber 122, and connected with the second air leakage channel 132 through the low-pressure alarm chamber 122.

[0034] The low pressure alarm valve 10 has at least the following beneficial effects: its main air inlet 110 can be fed with oxygen and other gases, and the gas in the main air inlet 110 enters the high pressure chamber 121 first, such as Figure 2 As shown, if the air pressure value in the high pressure chamber 121 is higher than or equal to the predetermined air pressure value, the piston 200 can overcome the elastic member 300 under the action of air pressure and move to the first position to block the first air leakage channel 131. The first air leakage channel 131 cannot communicate with the second air leakage channel 132 through the low pressure alarm chamber 122, that is, the alarm function is not triggered. Figure 3 and Figure 4As shown, if the air pressure value in the high-pressure chamber 121 is lower than the predetermined air pressure value, the piston 200 can compress the high-pressure chamber 121 under the elastic action of the elastic member 300 and move to the second position, so that the first air leakage channel 131 can be connected with the low-pressure alarm chamber 122, and connected with the second air leakage channel 132 through the low-pressure alarm chamber 122. At this time, a small part of the gas in the main air channel can be diverted into the first air leakage channel 131, and then discharged from the air leakage port 1321 of the second air leakage channel 132 through the low-pressure alarm chamber 122, realizing a sound alarm, thereby prompting the user that the air intake rate and internal air pressure of the lower valve body 100 are insufficient. If the air intake rate of the main air channel and the air pressure value of the high-pressure chamber 121 are subsequently increased until the air pressure value in the high-pressure chamber 121 is higher than or equal to the predetermined air pressure value, as shown in FIG. Figure 2 As shown, the piston 200 can be lifted up again under the action of the air pressure in the high-pressure chamber 121, that is, the piston 200 overcomes the elastic force of the elastic member 300 until it moves to the first position, blocking the first air leakage channel 131 again, thereby stopping the alarm.

[0035] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the low-pressure alarm valve 10 further includes a sealing ring 400 sleeved on the piston 200, the outer peripheral surface of the piston 200 is spaced from the inner peripheral surface of the main chamber 120, and the sealing ring 400 abuts against the inner peripheral surface of the main chamber 120 and the outer peripheral surface of the piston 200 to separate the main chamber 120 into the high-pressure chamber 121 and the low-pressure alarm chamber 122. The sealing ring 400 can seal and separate the high-pressure chamber 121 from the low-pressure alarm chamber 122 to prevent the high-pressure chamber 121 from leaking into the low-pressure alarm chamber 122, which causes the low-pressure alarm valve 10 to always be in an alarm state.

[0036] More specifically, if Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the outer peripheral surface of the piston 200 is further provided with a limiting rib 210, and in the axial direction of the piston 200, each of the sealing rings 400 is sandwiched between two limiting ribs 210 to limit the movement of the sealing ring 400 in the axial direction of the piston 200. The limiting rib 210 can prevent the sealing ring 400 from being offset relative to the piston 200 during the movement of the piston 200.

[0037] More specifically, if Figure 5As shown, in some embodiments, the limiting rib 210 extends in a ring shape along the circumference of the sealing ring 400. The ring-shaped limiting rib 210 is matched with the ring-shaped sealing ring 400, which can achieve a better limiting effect.

[0038] More specifically, if Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the sealing ring 400 is provided in plurality, and the plurality of sealing rings 400 are spaced apart along the axial direction of the piston 200 .

[0039] Furthermore, if Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, a limiting groove 220 is provided on the side of the piston 200 facing away from the high-pressure chamber 121, and one end of the elastic member 300 extends into the limiting groove 220 and elastically abuts against the groove wall of the limiting groove 220. The groove wall of the limiting groove 220 can limit the elastic member 300 extending therein, so as to prevent the elastic member 300 from bending and positional displacement.

[0040] Furthermore, in some of the embodiments, the elastic member 300 may be a compression spring or the like.

[0041] Furthermore, in some embodiments, the cross-sectional area of ​​the air inlet passage is greater than the cross-sectional area of ​​the first air leakage passage 131. Such a structural setting allows the gas to flow mainly to the high-pressure chamber 121. When the alarm function is turned on, if the alarm function is to be turned off, the air pressure of the high-pressure chamber 121 needs to be quickly increased to lift the piston 200 to the first position, so most of the gas needs to flow to the high-pressure chamber 121, and a small part can flow to the low-pressure alarm chamber 122 and the second air leakage passage 132 through the first air leakage passage 131 when an alarm is required.

[0042] See also Figure 1 and Figure 5 In some embodiments, the low pressure alarm valve 10 further includes a quick-connect plug 500 inserted into the surface of the valve body 100, and the quick-connect plug 500 is used to communicate with the main air intake duct 110 to achieve air intake.

[0043] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In some embodiments, the low pressure alarm valve 10 further includes a gland 600 , which is embedded in the front surface of the valve body 100 , and the elastic member 300 elastically abuts between the gland 600 and the piston 200 .

[0044] Specifically, in some embodiments, the piston 200 is threadedly connected to the valve body 100 and can adjust the elastic contact force of the elastic member 300 on the piston 200. By adjusting the depth of the gland 600 being screwed in, the squeezing force between the gland 600 and the elastic member 300 can be adjusted, thereby changing the elastic contact force of the elastic member 300 on the piston 200, and then changing the air pressure of the high-pressure chamber 121 to lift the piston 200 and move the required air pressure value. It can be understood that the deeper the gland 600 is screwed, the greater the compression degree of the elastic member 300, and the greater the elastic contact force of the elastic member 300 on the piston 200, which is equivalent to reducing the predetermined air pressure value and is easier to trigger the alarm; conversely, the shallower the gland 600 is screwed, the smaller the compression degree of the elastic member 300, and the smaller the elastic contact force of the elastic member 300 on the piston 200, which is equivalent to increasing the predetermined air pressure value.

[0045] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the piston 200 is provided with a protruding portion 230 at one end facing the high-pressure chamber 121, and the protruding portion 230 is used to abut against the valve body 100 to maintain the minimum volume of the high-pressure chamber 121. Such a structural setting can prevent the piston 200 from directly filling the entire high-pressure chamber 121 under the action of the elastic member 300 when the air pressure in the high-pressure chamber 121 is too low, so that the gas in the main airway cannot enter the high-pressure chamber 121. In other words, it is necessary to ensure that the high-pressure chamber 121 always has a certain amount of space to receive the incoming gas, until the air pressure value is higher than or equal to the predetermined air pressure value, and then the piston 200 is lifted to turn off the alarm function.

[0046] In addition, the present application also relates to a breathing apparatus, which includes the low-pressure alarm valve 10 as described in any of the above embodiments.

[0047] Since the breathing apparatus includes the low-pressure alarm valve 10 as described in any of the above embodiments, the breathing apparatus also includes at least the beneficial effects of the low-pressure alarm valve 10: the main air inlet 110 of the low-pressure alarm valve 10 can input oxygen and other gases, and the gas in the main air inlet 110 preferentially enters the high-pressure chamber 121. If the air pressure value in the high-pressure chamber 121 is higher than or equal to the predetermined air pressure value, the piston 200 can overcome the elastic member 300 and move to the first position under the action of the air pressure to block the first air leakage channel 131. The first air leakage channel 131 cannot be connected to the second air leakage channel 132 through the low-pressure alarm chamber 122, that is, the alarm function is not triggered. If the air pressure value in the high-pressure chamber 121 is lower than the predetermined air pressure value, the piston 200 can compress the high-pressure chamber 121 under the elastic action of the elastic member 300 and move to the second position, so that the first air leakage channel 131 can be connected with the low-pressure alarm chamber 122, and connected with the second air leakage channel 132 through the low-pressure alarm chamber 122. At this time, a small part of the gas in the main air channel can be diverted into the first air leakage channel 131, and then discharged from the air leakage port 1321 of the second air leakage channel 132 through the low-pressure alarm chamber 122, realizing a sound alarm, thereby prompting the user that the air intake rate and internal air pressure of the lower valve body 100 are insufficient. If the air intake rate of the main airway and the air pressure value of the high-pressure chamber 121 are subsequently increased until the air pressure value in the high-pressure chamber 121 is higher than or equal to the predetermined air pressure value, the piston 200 can be pushed up again under the action of the air pressure in the high-pressure chamber 121, that is, the piston 200 overcomes the elastic force of the elastic member 300 until it moves to the first position, and blocks the first air leakage channel 131 again, thereby stopping the alarm.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

[0050] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0051] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0053] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0055] In the description of this specification, the description of reference terms "one embodiment", "other implementation methods", etc. means that the specific features, structures, materials or features described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

Claims

1. A low pressure alarm valve, characterized in that: include: A valve body, wherein a main air inlet passage, a main chamber connected to the air inlet passage, a first air leakage passage and a second air leakage passage are provided in the valve body; A piston, wherein the piston is disposed in the main chamber and divides the main chamber into a high-pressure chamber and a low-pressure alarm chamber that is not connected to the high-pressure chamber, the high-pressure chamber is connected to the main air inlet passage, one end of a first air leakage passage is connected to the main air inlet passage, the other end of the first air leakage passage can be connected to the low-pressure alarm chamber, one end of the second air leakage passage is connected to the low-pressure alarm chamber, the other end of the second air leakage passage is penetrated through the valve body and a air leakage port is formed on the surface of the valve body; and An elastic member, wherein the elastic member elastically abuts against a side of the piston facing away from the high-pressure chamber, and the piston can move to a first position and a second position under the action of air pressure; when the air pressure value in the high-pressure chamber is higher than or equal to a predetermined air pressure value, the piston can overcome the elastic member and move to the first position under the action of air pressure to block the first air leakage channel, and the first air leakage channel cannot be connected to the second air leakage channel through the low-pressure alarm chamber; when the air pressure value in the high-pressure chamber is lower than the predetermined air pressure value, the piston can compress the high-pressure chamber under the elastic action of the elastic member and move to the second position, so that the first air leakage channel can be connected to the low-pressure alarm chamber, and connected to the second air leakage channel through the low-pressure alarm chamber.

2. The low pressure alarm valve according to claim 1, characterized in that: The low-pressure alarm valve also includes a sealing ring sleeved on the piston, the outer circumference of the piston and the inner circumference of the main chamber are spaced apart, and the sealing ring abuts against the inner circumference of the main chamber and the outer circumference of the piston to separate the main chamber into the high-pressure chamber and the low-pressure alarm chamber.

3. The low pressure alarm valve according to claim 2, characterized in that: The outer peripheral surface of the piston is also convexly provided with limiting ribs. In the axial direction of the piston, each of the sealing rings is sandwiched between two limiting ribs to limit the movement of the sealing ring in the axial direction of the piston.

4. The low pressure alarm valve according to claim 3, characterized in that: The limiting rib extends in a ring shape along the circumference of the sealing ring.

5. The low pressure alarm valve according to any one of claims 2 to 4, characterized in that: The sealing ring is provided in plurality, and the plurality of sealing rings are arranged at intervals along the axial direction of the piston.

6. The low pressure alarm valve according to any one of claims 1 to 4, characterized in that: A limiting groove is provided on a side of the piston facing away from the high-pressure chamber, and one end of the elastic member extends into the limiting groove and elastically abuts against a groove wall of the limiting groove; And / or, the elastic member is a compression spring; and / or, the cross-sectional area of ​​the air inlet passage is greater than the cross-sectional area of ​​the first air leakage passage; And / or, the low-pressure alarm valve further comprises a quick-connect plug inserted into the surface of the valve body, and the quick-connect plug is used to communicate with the main air intake duct to achieve air intake.

7. The low pressure alarm valve according to any one of claims 1 to 4, characterized in that: The low-pressure alarm valve further comprises a gland, which is embedded in the front surface of the valve body, and the elastic member elastically abuts between the gland and the piston.

8. The low pressure alarm valve according to claim 7, characterized in that: The piston is threadedly connected to the valve body and the elastic abutment force of the elastic member on the piston can be adjusted.

9. The low pressure alarm valve according to any one of claims 1 to 4, characterized in that: A lifting protrusion is provided at one end of the piston facing the high-pressure chamber, and the lifting protrusion is used to abut against the valve body to maintain the minimum volume of the high-pressure chamber.

10. A breathing apparatus, characterized in that Comprising the low pressure alarm valve as claimed in any one of claims 1 to 9.

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