CN210600295U - Density relay that gas leakage was reported to police - Google Patents

Abstract

The utility model relates to the technical field of circuit protection, specifically disclose a density relay that leaks gas and reports to police, connect valve module and include valve body, access pipe, axis, inner chamber and handle, the inner chamber includes equipment air flue, relay air flue and the detection air flue that extends to three direction respectively, the equipment air flue is equipped with the check valve, equipment air flue, relay air flue and detection air flue all misplace and set up, the inner chamber middle part closely overlaps and is equipped with hollow columnar access pipe, access pipe one end is open, access pipe other end fixed connection is located the handle of valve body outside, access pipe lateral wall has seted up four air vents; through setting up air vent and route pipe opening, can communicate arbitrary two or whole among equipment air flue, relay air flue and the detection air flue as required, just can reach and detect the check-up to the relay, dismantle a plurality of purposes such as replacement or normal use relay, and need not to dismantle the relay at this in-process.

Description

Density relay that gas leakage was reported to police

Technical Field

The utility model relates to a circuit protection technical field, concretely relates to density relay that gas leakage was reported to police.

Background

A density relay is a relay that monitors for leaks in a sealed container. The density relay mainly comprises two corrugated pipes, a standard SF6 gas bag, a microswitch contact, a lever and the like. The working principle of the circuit breaker is that an SF6 gas packet communicated with SF6 gas in the circuit breaker is compared with a standard gas packet, and the lever effect is utilized to drive an electric contact of a microswitch to act, so that the signaling and locking functions of the circuit breaker are realized. There are many types of density relays on the market today, among which density relays with air leakage warning function are particularly popular.

It should be noted that the density relay can accurately measure the density or pressure value of the SF6 gas only when the SF6 circuit breaker is out of operation and the internal and external temperatures of the circuit breaker reach balance; when the SF6 circuit breaker is in operation, the reading error of the density meter depends on the load current of the circuit breaker and the temperature rise caused by the loop resistance. Therefore, in order to ensure that the air leakage alarm function of the density relay can be normally used, when the density relay is installed on equipment, the density relay needs to be subjected to standard detection and precision rated setting, and is periodically verified in the using process. However, the general direct mount jointing equipment of current density relay needs to carry out the check-up to it before and after, needs repeated dismantlement and repacking density relay, and the risk that leads to density relay to take place to leak gas in this in-process can't be avoided, influences gas leakage alarming function's normal use, has reduced gas leakage alarm type density relay's life.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a density relay that leaks gas and reports to police, this design possess simple structure, can conveniently detect the check-up and dismantle the advantage of replacement to gas leakage warning type density relay, solved density relay at inspection and replacement in-process, can't avoid taking place the gas leakage risk, and then influence its problem of normal use.

The utility model discloses a density relay that gas leakage was reported to police, including the relay body and connect valve module, the relay body passes through connect valve module jointing equipment, connect valve module includes the valve body, the access pipe, the axis, inner chamber and handle, the valve body is the cross, run through in the valve body and offered imitative crisscross inner chamber, the inner chamber includes the equipment air flue that extends to three directions respectively, relay air flue and detection air flue, equipment air flue, relay air flue and detection air flue internal diameter all are less than the inner chamber internal diameter, the equipment air flue has been installed the check valve, the equipment air flue, relay air flue and detection air flue all misplace and set up, the inner chamber middle part closely overlaps hollow columnar access pipe that is equipped with, access pipe one end opening, access pipe other end fixed connection is located the outside handle of valve body, access pipe lateral wall has seted; when the passage pipe does not rotate, the four vent holes are not communicated with any one of the equipment air passage, the relay air passage and the detection air passage; when the passage pipe rotates ninety degrees clockwise, one vent hole and the opening of the passage pipe are communicated with the detection air passage and the equipment air passage respectively; when the passage pipe rotates one hundred eighty degrees clockwise, one of the vent holes and the opening of the passage pipe are respectively communicated with the relay air passage and the equipment air passage; when the passage pipe rotates clockwise by two hundred seventy degrees, the two vent holes and the opening of the passage pipe are respectively communicated with the equipment air passage, the relay air passage and the detection air passage.

The utility model discloses a density relay that leaks gas and reports to police, wherein the non-open end welding of passageway pipe has the I-shaped's I-shaped seat, the axis passes through I-shaped seat fixed connection passageway pipe, the welding of the axis other end has thinner cylindrical handle axle, the valve gap has been installed to the open end external fixation of the just right valve body of handle axle, valve gap inner wall has seted up the screw thread, the thread groove that the valve body outer wall corresponds, the screw thread closely agrees with in the thread groove, the terminal valve gap bottom fixed connection handle that runs through of handle axle, it has the spring to fill between valve gap inner wall bottom and the axis.

The utility model discloses a density relay of gas leakage warning, wherein it has the ball to fill between axis outer wall and the inner chamber inner wall, and the ball has four and installs about the axle center symmetry.

The utility model discloses a density relay of gas leakage warning, wherein the passageway pipe open end extends forward and forms step-like plug pipe, and the plug pipe closely inserts in one of equipment air flue, relay air flue and detection air flue, and the air flue that the passageway pipe open end just right faces forms the inclined plane with the junction of inner chamber, and it has the sealing washer to fill between plug pipe outer wall and the inclined plane; the circumference of the outer end face of the middle shaft is provided with a flange, and a sealing ring is filled between the flange and the inner cavity.

The utility model discloses a density relay that leaks gas and reports to police, wherein the activity of the middle part of the outer wall of access pipe is installed the locating piece, the locating piece is half fan-shaped cylindric, the middle part of the outer wall of access pipe is seted up the piece groove, one end swing joint in the piece groove of locating piece, the locating piece closely agrees with the piece groove, it has the shell fragment to fill between locating piece bottom and the piece groove bottom face, the inner chamber corresponds the position and has seted up the constant head tank, four constant head tanks and about the axle center symmetry, the locating piece closely; the handle disk surface is correspondingly provided with a passage pipe communication state indication scale.

The utility model discloses a density relay that gas leakage was reported to police, wherein valve body and handle all adopt the aluminum alloy through anodic oxidation surface treatment to make.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. this scheme is through setting up the route pipe, makes air vent and route pipe opening can communicate arbitrary two or whole among equipment air flue, relay air flue and the detection air flue as required, through simple structural change, just can reach and detect the check-up to the relay, dismantles a plurality of purposes such as replacement or normal use relay, and need not to dismantle the relay at this in-process, has avoided its risk that takes place to leak gas, has effectively prolonged the life of relay.

2. According to the scheme, the valve cover is connected with the valve body through the threads, and the middle shaft is connected with the pipeline through the I-shaped seat, so that the joint valve module is more convenient to assemble, and meanwhile, the appearance design is square, regular and attractive, the structure is free from abnormal shapes, the processing difficulty is low, and the processing efficiency is improved; the spring filled between the bottom of the inner wall of the valve cover and the middle shaft can effectively press the passage pipe while ensuring that the rotation of the middle shaft is not influenced, so that the passage pipe is prevented from moving randomly in the inner cavity, and the normal use of the joint valve module is ensured.

3. This scheme is through setting up the ball, then when guaranteeing that the passageway pipe is sealed tight, makes the axis rotation more smooth and easy, has guaranteed the normal use of joint valve module.

4. This scheme is through setting up the sealing washer of packing between plug pipe and the inclined plane and between flange and the inner chamber, when guaranteeing that centraxonial rotation is not influenced, effectually seals the route pipe, has avoided equipment air flue, relay air flue and the risk that the gas in the detection air flue probably reveals into the inner chamber rear portion, has guaranteed the normal use that connects the valve module.

5. This scheme is through setting up independent locating piece and four constant head tanks that correspond with it, when the passageway pipe is driven by the handle in the inner chamber and when rotatory, every ninety degrees of rotation, in the locating piece all can block into one of them constant head tank, can stabilize the location to the passageway pipe on the one hand, make the air flue be aimed at to the air vent accuracy, on the other hand also with the cooperation of the instruction scale of handle quotation, and then audio-visual passageway state of reflecting the passageway pipe makes things convenient for operating personnel to use.

6. The preparation material that this scheme was through setting up valve body and handle is the aluminum alloy through surface anodic oxidation treatment, and the quality is light, and appearance design is square, pleasing to the eye, no abnormal type structure, and the processing degree of difficulty is low, improves machining efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic sectional structural view of a front view of a valve body;

FIG. 2 is a schematic sectional view of the front view of the passage pipe in the state of communication between the relay air passage and the equipment air passage;

FIG. 3 is a schematic cross-sectional structural view of the front view of the passage tube in a state where the device air passage, the relay air passage and the detection air passage are communicated;

FIG. 4 is a schematic cross-sectional structural view of the front view of the passage tube in a state where the device air passage and the relay air passage are not communicated with each other, and the detection air passage;

fig. 5 is a schematic sectional view of the positioning block.

In the figure: 1. a valve body; 2. a passage tube; 3. a middle shaft; 4. an inner cavity; 5. a handle; 6. a valve cover; 7. a relay body; 11. a thread; 12. a seal ring; 13. a bevel; 14. positioning a groove; 21. a vent hole; 22. a plug tube; 23. an I-shaped seat; 24. positioning blocks; 241. a block groove; 242. a spring plate; 31. a stem; 311. a spring; 32. a ball bearing; 33. a flange; 41. an equipment airway; 411. a one-way valve; 42. a relay air passage; 43. and detecting the airway.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for description purposes, not specifically referring to the order or sequence, and are not intended to limit the present invention, but only to distinguish the components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1-5, a density relay for gas leakage alarm comprises a relay body 7 and a connector valve module, wherein the relay body 7 is connected with equipment through the connector valve module, the connector valve module comprises a valve body 1, a passage pipe 2, a middle shaft 3, an inner cavity 4 and a handle 5, the valve body 1 is cross-shaped, the valve body 1 is internally provided with a cross-shaped inner cavity 4 in a penetrating way, the inner cavity 4 comprises an equipment air passage 41, a relay air passage 42 and a detection air passage 43 which respectively extend towards three directions, the inner diameters of the equipment air passage 41, the relay air passage 42 and the detection air passage 43 are all smaller than the inner diameter of the inner cavity 4, the equipment air passage 41 is provided with a one-way valve 411, the equipment air passage 41, the relay air passage 42 and the detection air passage 43 are all arranged in a staggered way, the middle part of the inner cavity 4 is tightly sleeved with a hollow, the side wall of the passage pipe 2 is provided with four vent holes 21; when the passage pipe 2 does not rotate, the four vent holes 21 are not communicated with any one of the equipment air passage 41, the relay air passage 42 and the detection air passage 43; when the passage pipe 2 rotates ninety degrees clockwise, one of the vent holes 21 and the opening of the passage pipe 2 are communicated with the detection air passage 43 and the equipment air passage 41 respectively; when the passage pipe 2 rotates clockwise by one hundred eighty degrees, one of the vent holes 21 and the opening of the passage pipe 2 are communicated with the relay air passage 42 and the equipment air passage 41 respectively; when the passage pipe 2 rotates clockwise by two hundred and seventy degrees, two of the vent holes 21 and the opening of the passage pipe 2 communicate with the device air passage 41, the relay air passage 42 and the detection air passage 43, respectively. This scheme is through setting up access pipe 2, make air vent 21 and access pipe 2 openings can communicate arbitrary two or whole among equipment air flue 41, relay air flue 42 and the detection air flue 43 as required according to the circumstances, through simple structural change, just can reach and detect the check-up to the relay, dismantle a plurality of purposes such as replacement or normal use relay, and need not to dismantle the relay at this in-process, avoided its risk that takes place the gas leakage, effectively prolonged the life of relay.

Further, an I-shaped base 23 is welded at the non-open end of the passage pipe 2, the middle shaft 3 is fixedly connected with the passage pipe 2 through the I-shaped base 23, a thin cylindrical handle shaft 31 is welded at the other end of the middle shaft 3, a valve cover 6 is fixedly arranged outside the open end of the valve body 1 opposite to the handle shaft 31, a thread 11 is arranged on the inner wall of the valve cover 6, a thread groove corresponding to the outer wall of the valve body 1 is tightly matched with the thread 11 in the thread groove, the tail end of the handle shaft 31 penetrates through the bottom of the valve cover 6 to be fixedly connected with a handle 5, and a spring 311 is filled between the bottom of the inner. According to the scheme, the valve cover 6 is connected with the valve body 1 through the threads 11, and the middle shaft 3 is connected with the pipeline pipe 2 through the I-shaped seat 23, so that the assembly of the connector valve module is more convenient, the appearance design is square and attractive, the connector valve module has no abnormal structure, the processing difficulty is low, and the processing efficiency is improved; the spring 311 filled between the bottom of the inner wall of the valve cover 6 and the middle shaft 3 effectively presses the passage pipe 2 while ensuring that the rotation of the middle shaft 3 is not influenced, so that the passage pipe is prevented from moving randomly in the inner cavity 4, and the normal use of the joint valve module is ensured.

Furthermore, the balls 32 are filled between the outer wall of the middle shaft 3 and the inner wall of the inner cavity 4, and the number of the balls 32 is four and is symmetrically arranged around the axis. According to the scheme, the balls 32 are arranged, so that the central shaft 3 can rotate more smoothly while the passage pipe 2 is ensured to be sealed tightly, and the normal use of the joint valve module is ensured.

Furthermore, the open end of the passage pipe 2 extends forwards to form a step-shaped plug pipe 22, the plug pipe 22 is tightly inserted into one of the equipment air passage 41, the relay air passage 42 and the detection air passage 43, an inclined plane 13 is formed at the joint of the air passage opposite to the open end of the passage pipe 2 and the inner cavity 4, and a sealing ring 12 is filled between the outer wall of the plug pipe 22 and the inclined plane 13; the outer end surface circumference of the middle shaft 3 is provided with a flange 33, and a sealing ring 12 is filled between the flange 33 and the inner cavity 4. This scheme is through setting up the sealing washer 12 of packing between plug pipe 22 and the inclined plane 13 and between flange 33 and the inner chamber 4, when guaranteeing that axis 3's rotation is not influenced, effectually seal passageway pipe 2, has avoided the risk that the gas in equipment air flue 41, relay air flue 42 and the detection air flue 43 probably reveals into inner chamber 4 rear portion, has guaranteed the normal use that connects the valve module.

Furthermore, a positioning block 24 is movably arranged in the middle of the outer wall of the passage pipe 2, the positioning block 24 is in a semi-sector cylindrical shape, a block groove 241 is formed in the middle of the outer wall of the passage pipe 2, one end of the positioning block 24 is movably connected into the block groove 241, the positioning block 24 is tightly matched with the block groove 241, an elastic sheet 242 is filled between the bottom of the positioning block 24 and the bottom end face of the block groove 241, positioning grooves 14 are formed in corresponding positions of the inner cavity 4, four positioning grooves 14 are symmetrical about the axis, and the positioning block 24 is tightly matched with; the disc surface of the handle 5 is correspondingly provided with a passage pipe 2 communication state indication scale. This scheme is through setting up independent locating piece 24 and four constant head tanks 14 that correspond with it, when passageway pipe 2 is driven by handle 5 in inner chamber 4 and is rotatory, every ninety degrees of rotation, locating piece 24 all can block in one of them constant head tank 14, can stabilize the location to passageway pipe 2 on the one hand, make air vent 21 accurate alignment air flue, on the other hand also cooperates with the instruction scale of handle 5 quotation, and then audio-visual passageway state of reflecting passageway pipe 2, make things convenient for operating personnel to use.

Further, the valve body 1 and the handle 5 are both made of aluminum alloy subjected to anodic oxidation surface treatment. This scheme is through setting up the preparation material of valve body 1 and handle 5 for the aluminum alloy through surface anodic oxidation treatment, and the quality is light, and appearance design is square, pleasing to the eye, no abnormal type structure, and the processing degree of difficulty is low, improves machining efficiency.

The utility model discloses when using:

the valve body 1 is firstly installed and connected on the equipment, the air passage 41 of the equipment is communicated with an air vent line of external equipment, then the relay body 7 is installed and connected on the valve body 1, the air passage 42 of the relay is communicated with the air vent line of the relay body 7, the detection air passage 43 is sealed through a self-sealing valve when not used, and the detection air passage 43 is communicated with the air vent line of the external detection equipment when used.

When the relay body 7 is used normally, the valve body 1 is connected to the equipment, and an operator rotates the handle 5 to enable the indication scales on the disc surface of the handle 5 to point to the communication state of the relay air passage 42 and the equipment air passage 41. At the moment, the relay body 7 and the external equipment are communicated with each other through the relay air channel 42, the vent hole 21, the passage pipe 2 and the relay air channel 42 in sequence, and if the equipment fails to generate SF6 gas, the SF6 gas enters the relay body 7, so that the relay body 7 gives an alarm.

When detecting relay body 7, install check out test set on valve body 1, then operating personnel rotary handle 5, all communicate the state with the instruction scale point to equipment air flue 41 and relay air flue 42 and the detection air flue 43 of handle 5 quotation, and inner chamber 4 and passageway pipe 2 form a whole of ventilating this moment. When the check valve 411 is closed and the device air duct 41 is blocked, the relay body 7 can now be tested and set to the desired accuracy using the test device. When the check valve 411 is opened, a detection device can be used to detect whether the state of the comparative relay body 7 is normal.

When replacing the relay body 7, then operating personnel twist grip 5, with the instruction scale pointing to equipment air flue 41 and relay air flue 42 of handle 5 quotation and detect the air flue 43 and all not communicate the state, inner chamber 4 and access pipe 2 completely isolated this moment, and then make things convenient for operating personnel to dismantle and replace the relay body 7, avoid the interior SF6 of equipment air flue 41 to discharge, and then cause harmful effects to the environment.

It should be noted that, for the more audio-visual passageway state that reflects passageway pipe 2, this scheme has set up a locating piece 24 and four constant head tanks 14, when passageway pipe 2 is driven and rotatory by handle 5 in inner chamber 4, every ninety degrees of rotation, locating piece 24 all can block in one of them constant head tank 14, on the one hand can stabilize the location to passageway pipe 2, make air vent 21 accurately aim at the air flue, on the other hand also cooperates with the instruction scale of handle 5 quotations, and then audio-visual passageway state that reflects passageway pipe 2, make things convenient for operating personnel to use.

The valve cover 6 is connected with the valve body 1 through the threads 11, and the middle shaft 3 is connected with the pipeline 2 through the I-shaped seat 23, so that the assembly of the connector valve module is more convenient, the appearance design is square and attractive, no abnormal structure exists, the processing difficulty is low, and the processing efficiency is improved; the spring 311 filled between the bottom of the inner wall of the valve cover 6 and the middle shaft 3 effectively presses the passage pipe 2 while ensuring that the rotation of the middle shaft 3 is not influenced, so that the passage pipe is prevented from moving randomly in the inner cavity 4, and the normal use of the joint valve module is ensured.

The sealing rings 12 filled between the plug tube 22 and the inclined plane 13 and between the flange 33 and the inner cavity 4 effectively seal the passage tube 2 while ensuring that the rotation of the central shaft 3 is not influenced, thereby avoiding the risk that the gas in the equipment air passage 41, the relay air passage 42 and the detection air passage 43 is possibly leaked into the rear part of the inner cavity 4 and ensuring the normal use of the connector valve module.

The balls 32 ensure that the channel pipe 2 is tightly sealed, and simultaneously, the middle shaft 3 can rotate more smoothly, so that the normal use of the joint valve module is ensured.

The valve body 1 and the handle 5 are made of aluminum alloy subjected to surface anodic oxidation treatment, so that the valve body is light in weight, square and attractive in appearance design, free of abnormal structures, low in processing difficulty and capable of improving processing efficiency.

The utility model discloses possess simple structure, can conveniently detect the check-up and dismantle the advantage of replacement to gas leakage warning type density relay, solved density relay at inspection and replacement in-process, can't avoid taking place the gas leakage risk, and then influence its problem of normal use.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (6)

1. The utility model provides a density relay of gas leakage warning, includes relay body (7) and connects the valve module, and this relay body (7) are through connecting valve module jointing equipment, its characterized in that: the connector valve module comprises a valve body (1), a passage pipe (2), a middle shaft (3), an inner cavity (4) and a handle (5), the valve body (1) is in a cross shape, the valve body (1) is internally provided with an imitated cross-shaped inner cavity (4) in a through mode, the inner cavity (4) comprises an equipment air passage (41), a relay air passage (42) and a detection air passage (43) which extend towards three directions respectively, the inner diameters of the equipment air passage (41), the relay air passage (42) and the detection air passage (43) are smaller than the inner diameter of the inner cavity (4), the equipment air passage (41) is provided with a one-way valve (411), the equipment air passage (41), the relay air passage (42) and the detection air passage (43) are arranged in a staggered mode, the middle of the inner cavity (4) is tightly sleeved with the hollow columnar passage pipe (2), one end of the passage pipe (2) is opened, the other end of the passage pipe (2), the side wall of the passage pipe (2) is provided with four vent holes (21);

wherein the content of the first and second substances,

when the passage pipe (2) does not rotate, the four vent holes (21) are not communicated with any one of the equipment air passage (41), the relay air passage (42) and the detection air passage (43);

when the passage pipe (2) rotates ninety degrees clockwise, one vent hole (21) and the opening of the passage pipe (2) are communicated with the detection air passage (43) and the equipment air passage (41) respectively;

when the passage pipe (2) rotates clockwise by one hundred eighty degrees, one of the vent holes (21) and the opening of the passage pipe (2) are respectively communicated with the relay air passage (42) and the equipment air passage (41);

when the passage pipe (2) rotates clockwise by two hundred and seventy degrees, the two vent holes (21) and the opening of the passage pipe (2) are respectively communicated with the equipment air passage (41), the relay air passage (42) and the detection air passage (43).

2. The density relay for air leakage alarm according to claim 1, characterized in that: the non-open end of the passage pipe (2) is welded with an I-shaped seat (23), the middle shaft (3) is fixedly connected with the passage pipe (2) through the I-shaped seat (23), the other end of the middle shaft (3) is welded with a thinner cylindrical handle shaft (31), a valve cover (6) is fixedly arranged outside the open end of the valve body (1) opposite to the handle shaft (31), the inner wall of the valve cover (6) is provided with a thread (11), the outer wall of the valve body (1) corresponds to a thread groove, the thread (11) is tightly matched in the thread groove, the tail end of the handle shaft (31) penetrates through the bottom of the valve cover (6) and is fixedly connected with a handle (5), and a spring (311) is filled between the bottom of the inner wall of the valve cover (6).

3. The density relay for air leakage alarm according to claim 1, characterized in that: balls (32) are filled between the outer wall of the middle shaft (3) and the inner wall of the inner cavity (4), and the number of the balls (32) is four, and the four balls are symmetrically arranged around the axis.

4. The density relay for air leakage alarm according to claim 1, characterized in that: the open end of the passage pipe (2) extends forwards to form a step-shaped plug pipe (22), the plug pipe (22) is tightly inserted into one of an equipment air passage (41), a relay air passage (42) and a detection air passage (43), an inclined plane (13) is formed at the joint of the air passage opposite to the open end of the passage pipe (2) and the inner cavity (4), and a sealing ring (12) is filled between the outer wall of the plug pipe (22) and the inclined plane (13); a flange (33) is arranged on the circumference of the outer end face of the middle shaft (3), and a sealing ring (12) is filled between the flange (33) and the inner cavity (4).

5. The density relay for air leakage alarm according to claim 1, characterized in that: the positioning block (24) is movably arranged in the middle of the outer wall of the passage pipe (2), the positioning block (24) is in a semi-fan-shaped cylindrical shape, a block groove (241) is formed in the middle of the outer wall of the passage pipe (2), one end of the positioning block (24) is movably connected into the block groove (241), the positioning block (24) is tightly matched with the block groove (241), an elastic sheet (242) is filled between the bottom of the positioning block (24) and the bottom end face of the block groove (241), positioning grooves (14) are formed in the corresponding positions of the inner cavity (4), the four positioning grooves (14) are symmetrical about the axis, and the positioning block (24) is tightly matched with the positioning grooves (14); the corresponding passage pipe (2) communication state indication scale is arranged on the disc surface of the handle (5).

6. The density relay for air leakage alarm according to claim 1, characterized in that: the valve body (1) and the handle (5) are both made of aluminum alloy subjected to anodic oxidation surface treatment.

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