Gas shut-off valve with automatic air suction shut-off function

Abstract

This invention discloses a gas shut-off valve with automatic air intake and isolation function, belonging to the field of gas shut-off valve technology. Based on the operating principle and usage environment of existing gas shut-off valves, it uses a valve core seat in conjunction with an isolation port to switch the gas supply state. The difference lies in that it adopts an active air intake method. This method can initially achieve the purpose of gas / air mixing, but the key is to cooperate with two modes in the usage environment: the gas stove is not running and the gas stove is running normally. The pressure change generated by the active air intake directly reflects whether there is a risk of leakage in the above two states. This is manifested in that the actively intake air passively changes the pressure change in the above two states under the action of the gas's own pressure, thereby detecting safety hazards in a timely manner through practical measurement and independently cutting off the gas supply.

Description

Technical Field

[0001] The invention relates to the technical field of gas cut-off valves, and in particular to a gas cut-off valve with an automatic air suction and isolation function. Background Art

[0002] The main function of the gas shutoff valve is to cut off the gas supply. Its essence is to connect with the combustible gas leakage detection instrument. When the instrument detects the combustible gas leakage, it automatically and quickly closes the main gas supply valve to cut off the gas supply. It can be understood that:

[0003] The working process of a conventional gas shut-off valve requires cooperation with external instruments and is an "after-the-fact" structure, which is specifically manifested in that: on the basis of a gas leak and after the relevant leak detection instrument has detected the leak, the gas shut-off valve then cuts off the gas supply. It should be noted that there is still a safety hazard in the time from when the gas starts to leak until the relevant leak detection instrument detects the leak, specifically because the gas is in a continuous leaking state during this time. This application proposes a solution. Summary of the invention

[0004] The purpose of the present invention is to provide a gas shut-off valve with an automatic air intake and isolation function. It is explained that the commonly used gas shut-off valve is essentially an "after-the-fact" structure. Specifically, there is still a safety hazard in the time from the beginning of gas leakage to the time when the relevant leakage detection instrument detects the leakage state. Therefore, it can be understood that it is difficult for conventional gas shut-off valves to achieve the purpose of timely response and action.

[0005] The object of the present invention can be achieved by the following technical scheme: a gas shutoff valve with automatic air suction and isolation function, comprising a valve body and a valve seat, wherein an air flow passage is arranged inside the valve body, and a partition opening is arranged at a middle position of the valve body corresponding to the air flow passage, the valve seat is located just above the partition opening, and a directional sleeve is installed at a lower surface of the valve seat;

[0006] A valve core seat corresponding to the partition port is arranged directly below the directional sleeve, an air duct is installed at the center point of the lower side of the valve core seat, and a fan unit corresponding to the air duct is installed inside the valve core seat, a connecting sleeve corresponding to the air duct is installed at the lower side of the valve body, and the air duct and the connecting sleeve are slidably connected;

[0007] A valve core rod is installed at the center position of the upper surface of the valve core seat, a vertically arranged directional air sleeve is arranged between the inner wall of the directional sleeve and the outer wall of the valve core rod, a float balloon is arranged inside the directional air sleeve, connecting springs are installed at the upper and lower sides of the float balloon, an upper opening and a lower opening are opened on the directional air sleeve, and an upper air port and a lower air port corresponding to the upper opening and the lower opening are opened on the valve core rod and the directional sleeve.

[0008] It is further configured as follows: an electric push rod is installed at the top position inside the installation sleeve, a transmission rod of the electric push rod passes downward through the valve seat, and the end of the transmission rod of the electric push rod is fixedly connected to the valve core rod, and a controller is installed on the installation sleeve.

[0009] It is further configured as follows: an air bin corresponding to the fan group is opened in the valve core rod, the upper air port is located at the internal top end of the air bin, and the lower air port is located at a lower position than the upper air port.

[0010] It is further configured as follows: the outer diameter of the floating bag balloon is equal to the inner diameter of the directional air sleeve, and the floating bag balloon is located in the middle of the lower opening and the upper opening, and the valve core rod is slidably connected to the directional sleeve.

[0011] It is further configured that: the distance between the floating balloon and the bottom end of the inner wall of the directional air sleeve is smaller than the distance between the floating balloon and the top end of the inner wall of the directional air sleeve.

[0012] It is further configured as follows: a displacement sensor is installed on the upper surface position inside the mounting sleeve corresponding to the valve seat, a transmission rod of the displacement sensor sequentially passes through the valve seat, the directional sleeve and the directional air sleeve downward, and the end of the displacement sensor transmission rod is fixedly connected to the float balloon.

[0013] It is further configured that: the gas flow passage is respectively configured as a gas inlet and a gas outlet through a partition opening, and the air duct is arranged in the gas flow passage corresponding to the gas inlet.

[0014] The present invention has the following beneficial effects:

[0015] 1. The overall structure is based on the operating principle and use environment of the conventional gas shut-off valve. The method of shutting off the gas supply is still to stop the gas supply by cooperating with the valve core seat and the partition port. The difference is that the overall structure is based on the setting position of the valve core seat. The fan unit continuously inhales the external ambient air. Its purpose is to initially achieve the purpose of gas / air mixing. When the air is inhaled, the pressure change inside the directional gas sleeve will be changed. Combined with the gas pressure itself, there will be an obvious pressure difference between the upper and lower spaces of the directional gas sleeve corresponding to the floating balloon. Then, the pressure difference is converted into a linear motion form. The gas leakage device is fed back through the displayed value on the displacement sensor, so that the practical measurement function can be achieved, and whether there is a gas leakage risk can be fed back in time.

[0016] 2. In combination with the above content, the overall structure can simultaneously meet two modes in the use environment, namely, the gas stove is not running and the gas stove is running normally. The two modes operate independently. The essence is that the actively inhaled air passively changes the pressure changes in the above two states under the action of the gas's own pressure, and there are differences in the pressure changes in the above two modes, thereby forming an independently perceived operating mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the gas shutoff valve with automatic air suction and isolation function proposed by the present invention;

[0019] Figure 2 A cross-sectional view of a valve body in a gas shutoff valve with an automatic air suction shutoff function proposed by the present invention;

[0020] Figure 3 The gas shutoff valve with automatic air suction and isolation function proposed by the present invention Figure 1 A cross-sectional view of

[0021] Figure 4 A cross-sectional view of a directional sleeve in a gas shutoff valve with an automatic air suction and isolation function proposed by the present invention;

[0022] Figure 5 This is a structural schematic diagram of a valve core seat in a gas shutoff valve with an automatic air suction isolation function proposed by the present invention;

[0023] Figure 6 The invention discloses a cross-sectional view of a directional sleeve corresponding to a directional rod seat in a gas shut-off valve with an automatic air suction and isolation function.

[0024] In the figure: 1. valve body; 2. valve seat; 3. mounting sleeve; 4. controller; 5. partition port; 6. connecting sleeve; 7. air duct; 8. valve core seat; 9. directional sleeve; 10. electric push rod; 11. displacement sensor; 12. fan unit; 13. directional air sleeve; 14. valve core rod; 15. upper air port; 16. connecting spring; 17. float balloon; 18. lower air port; 19. lower port; 20. upper port. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1: The essence of the gas shutoff valve is a pipeline shutoff structure during gas supply, and its essence is a "later-known" structure. Specifically, there is still a safety hazard in the time from the beginning of gas leakage to the relevant leakage detection instrument detecting the leakage state. Therefore, it is understandable that it is difficult for conventional gas shutoff valves to achieve the purpose of timely response and action. The following technical solutions are proposed for this purpose:

[0027] Reference Figures 1 to 6 The gas shutoff valve with automatic air suction and isolation function in this embodiment includes a valve body 1 and a valve seat 2. The valve body 1 is provided with a gas flow passage, and a partition opening 5 is provided at the middle position of the valve body 1 corresponding to the gas flow passage. The valve seat 2 is located directly above the partition opening 5, and a directional sleeve 9 is installed on the lower surface of the valve seat 2.

[0028] A valve core seat 8 corresponding to the partition opening 5 is arranged directly below the directional sleeve 9, an air duct 7 is installed at the center point of the lower side of the valve core seat 8, and a fan unit 12 corresponding to the air duct 7 is installed inside the valve core seat 8, and a connecting sleeve 6 corresponding to the air duct 7 is installed at the lower side of the valve body 1, and the air duct 7 and the connecting sleeve 6 are slidably connected;

[0029] A valve core rod 14 is installed at the center position of the upper surface of the valve core seat 8, and a vertically arranged directional air sleeve 13 is arranged between the inner wall of the directional sleeve 9 and the outer wall of the valve core rod 14. A floating bag balloon 17 is arranged inside the directional air sleeve 13, and connecting springs 16 are installed on the upper and lower sides of the floating bag balloon 17. An upper opening 20 and a lower opening 19 are opened on the directional air sleeve 13, and an upper air port 15 and a lower air port 18 corresponding to the upper opening 20 and the lower opening 19 are opened on the valve core rod 14 and the directional sleeve 9.

[0030] An electric push rod 10 is installed at the top position inside the mounting sleeve 3. The transmission rod of the electric push rod 10 penetrates the valve seat 2 downward, and the end of the transmission rod of the electric push rod 10 is fixedly connected to the valve core rod 14. A controller 4 is installed on the mounting sleeve 3. An air chamber corresponding to the fan unit 12 is opened in the valve core rod 14. The upper air port 15 is set at the top position inside the air chamber, and the lower air port 18 is set at a position lower than the upper air port 15.

[0031] Working principle: First of all, it should be explained that the relevant structure proposed in this embodiment is basically similar to the current shut-off valve structure, and its essence is: the shut-off valve is installed on the gas pipeline, and the electric push rod 10 drives the valve core seat 8 to move up until it is separated from the partition port 5, which is used to indicate that the gas pipeline is in a normal connection state; on the contrary, the electric push rod 10 drives the valve core seat 8 to move down and contact the partition port 5, which is used to indicate that the gas pipeline is in a shut-off state. This part will not be explained;

[0032] In this embodiment, the valve core seat 8 is optimized and improved: specifically, a fan unit 12 is added inside the valve core seat 8, referring to Figure 3 The fan unit 12 can generate upward wind force, and then the air outside the valve body 1 can be directly sucked into the valve body 1. For details, refer to Figure 6 The inhaled air enters the valve body 1 through the upper air port 15 - the upper through port 20 - the interior of the directional air sleeve 13 - the lower through port 19 - the lower air port 18. The purpose of this is to initially complete the mixing process of the gas and air, but its key role is to actively cause the internal pressure of the directional air sleeve 13 to present a pressure difference, and use the pressure difference to feedback whether there is a risk of gas leakage.

[0033] Embodiment 2: This embodiment describes the operation process of the directional gas sleeve when the gas supply is coordinated:

[0034] The outer diameter of the float balloon 17 is equal to the inner diameter of the directional air sleeve 13, and the float balloon 17 is located in the middle position between the lower opening 19 and the upper opening 20. The valve core rod 14 and the directional sleeve 9 are slidably connected. The distance between the float balloon 17 and the bottom end of the inner wall of the directional air sleeve 13 is smaller than the distance between the float balloon 17 and the top end of the inner wall of the directional air sleeve 13. A displacement sensor 11 is installed on the upper surface position of the valve seat 2 corresponding to the mounting sleeve 3. The transmission rod of the displacement sensor 11 passes through the valve seat 2, the directional sleeve 9 and the directional air sleeve 13 in sequence, and the end of the transmission rod of the displacement sensor 11 is fixedly connected to the float balloon 17. The gas flow path is respectively set as the gas inlet and the gas outlet through the partition port 5, and the air duct 7 is set in the gas flow path corresponding to the gas inlet.

[0035] First, the setting position of the valve core seat 8 needs to be limited according to the gas flow direction, such as Figure 3 As shown, if the gas flows continuously from left to right, it can be understood that the left side of the gas flow channel is the direct pipeline structure of the gas, and the right side of the gas flow channel is the pipeline structure for transporting the gas to the gas stove. If there is a risk of leakage in the pipeline structure of the gas stove, the overall solution mainly performs leakage self-detection on the gas outlet. For the use environment of the gas shut-off valve, the following solution is explained:

[0036] S1: When the valve core seat 8 is separated from the isolation port 5, the normal flow of gas is realized. Figure 3 and Figure 6 As described above, the upper through port 20 is connected to the upper air port 15, and the lower through port 19 is connected to the lower air port 18. Then, under the action of the fan unit 12, air is continuously added to the gas bin and enters the upper end position of the directional gas sleeve 13. However, the gas itself has a certain pressure, so there is an obvious pressure difference between the upper and lower sides of the corresponding floating balloon 17 in the top box cabinet gas sleeve 13, and as the air is continuously added to the directional gas sleeve 13, the pressure difference will also change significantly. However, when a leakage problem occurs at the gas outlet position, it will further affect the above-mentioned pressure difference. This part is the key technical point in this embodiment;

[0037] S2: Combined with S1, because the gas pressure itself is in a relatively stable state, under the action of the gas pressure itself and under the action of the two sets of connecting springs 16, the float balloon 17 floats up to a certain position and then stops moving. However, during the air replenishment process, the accumulated air pressure continues to push the float balloon 17 downward until the float balloon 17 moves to the position corresponding to the lower through port 19 and the lower air port 18, and the air in the directional air sleeve 13 is replenished into the valve body 1 along the lower through port 19 and the lower air port 18, and then the pressure difference between the upper and lower sides of the float balloon 17 changes again, and the pressure difference borne by the float balloon 17 is finally converted into the vertical movement of the float balloon 17, and its vertical movement process can be directly detected by the displacement sensor 11. Then, in the present invention, the display value in the displacement sensor 11 is used as the key parameter for feedback whether there is a leak.

[0038] Embodiment 3: This embodiment is combined with Embodiment 2 to explain the operation process of the gas shutoff valve proposed in the present invention, and involves explaining the structure of the gas stove. More specifically, the use process of the structure of the gas stove involves the following two stages: the first stage is that the gas stove is temporarily closed, and the second stage is that the gas is in a normal operating state.

[0039] Phase A: When the gas stove is in a temporarily closed state, the gas inside the valve body 1 will not flow into the structure of the gas stove. Then, under the pressure of the gas itself and the added air pressure, the float balloon 17 is difficult to continue moving after moving downward to the corresponding position. In this state, the initial value in the displacement sensor 11 is first set to Lo, and when the fan unit 12 continues to inhale air, Lo presents a small increase state, so that the dynamic value in the displacement sensor 11 is set to Lt, such as the gas flow channel at the gas outlet position always maintains a leak-free state, and the air is continuously injected into the upper end position of the directional air sleeve 13, but the pressure generated when the air is injected is difficult to completely overcome the gas pressure, so that the air only maintains the float balloon 17 to move to the limit position, thereby optimizing the dynamic value recorded by the displacement sensor 11 to the limit value L1 again, and the detection data in the displacement sensor 11 is maintained at the value of L1, thereby marking that the state is in a leak-free safety state, and in the leak-free safety state, the fan unit 12 needs to be temporarily closed;

[0040] On the contrary, when leakage occurs in the gas flow passage corresponding to the gas outlet, the gas inside the valve body 1 is in a continuous leakage state, and the air continuously added to the directional gas sleeve 13 can further overcome the gas pressure, so that the float balloon 17 can continue to move. In this state, Lt is marked, and Lt>L1, which means that the float balloon 17 continues to move at the extreme position, but as shown in the first embodiment, when the float balloon 17 moves to the position corresponding to the lower gas outlet 18, air is added to the inside of the valve body 1;

[0041] Stage B: When the gas stove is in normal operation and the gas flow passage corresponding to the gas outlet is safe and leak-free, the gas inside the valve body 1 is continuously delivered to the gas stove and other structures, and the pressure in the lower side of the directional gas sleeve 13 corresponding to the float balloon 17 is lower than the pressure in the lower side of the directional gas sleeve 13 corresponding to the float balloon 17 when the gas stove is in a temporarily closed state, so that during normal operation, the air will also push the float balloon 17 downward to the limit position, but there is a clear difference from stage A in that the float balloon 17 in this stage will continue to move downward until it moves to the position corresponding to the lower gas outlet 18, and the limit value is set to L2 in this stage, L2>L1;

[0042] However, when there is a leak in the air flow path corresponding to the gas outlet, the float balloon 17 will also move to the position of the corresponding lower gas outlet 18, but there is an obvious difference: further setting is performed based on the displayed value in the displacement sensor 11: the moving speed of the float balloon 17 is set to V=(L2-Lo) / t, where t is used to represent the time consumed by the float balloon 17 to move to the extreme position, and are V1 and V2 respectively, where V1 and V2 correspond to a no-leakage state and a leakage state respectively, and when V2>V1, it means that when the gas stove is in normal operation, the air flow path corresponding to the gas outlet is in a leakage state.

[0043] In combination with the above content, in stage A and stage B, when there is a risk of leakage in the gas flow path corresponding to the gas outlet, the electric push rod 10 still follows the operating principle of the conventional shut-off valve, and drives the valve core seat 8 to move downward and fit the partition port 5, thereby directly achieving the purpose of cutting off the gas supply in advance.

[0044] To sum up: based on the operating principle and use environment of the current gas shut-off valve, the valve core seat is used in conjunction with the partition port to switch the gas supply state. The difference is that: the method of actively inhaling external air is adopted, which can initially achieve the purpose of gas / air mixing. However, the key lies in the two modes in the coordinated use environment, namely the gas stove is not running and the gas stove is running normally. Through the air pressure changes generated by active inhalation, whether there is a leakage risk in the above two states is directly fed back, which is manifested as: the actively inhaled air passively changes the pressure changes in the above two states under the action of the gas's own pressure, so as to timely discover safety hazards in a practical and measured way and independently cut off the gas supply.

[0045] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A gas shut-off valve with an automatic air suction and shut-off function, comprising a valve body (1) and a valve seat (2), characterized in that: The valve body (1) is provided with an air flow passage inside, and a partition opening (5) is provided at a middle position of the valve body (1) corresponding to the air flow passage. The valve seat (2) is located directly above the partition opening (5), and a directional sleeve (9) is installed on the lower surface of the valve seat (2). A valve core seat (8) corresponding to the partition opening (5) is provided at a position directly below the directional sleeve (9), an air duct (7) is installed at the center point of the lower side of the valve core seat (8), and a fan unit (12) corresponding to the air duct (7) is installed inside the valve core seat (8), and a connecting sleeve (6) corresponding to the air duct (7) is installed at a position below the valve body (1), and the air duct (7) and the connecting sleeve (6) are in sliding connection; A valve core rod (14) is installed at the center position of the upper surface of the valve core seat (8), a vertically arranged directional air sleeve (13) is provided between the inner wall of the directional sleeve (9) and the outer wall of the valve core rod (14), a floating bag balloon (17) is provided inside the directional air sleeve (13), and connecting springs (16) are installed at the upper and lower positions of the floating bag balloon (17), an upper opening (20) and a lower opening (19) are provided on the directional air sleeve (13), and an upper air port (15) and a lower air port (18) corresponding to the upper opening (20) and the lower opening (19) are provided on the valve core rod (14) and the directional sleeve (9); An air chamber corresponding to the fan unit (12) is provided in the valve core rod (14), the upper air port (15) is located at the top end of the air chamber, the lower air port (18) is located lower than the upper air port (15), the outer diameter of the float balloon (17) is equal to the inner diameter of the directional air sleeve (13), and the float balloon (17) is located in the middle of the lower opening (19) and the upper opening (20), the valve core rod (14) and the directional sleeve (9) are in sliding connection, a displacement sensor (11) is installed on the upper surface of the valve seat (2) corresponding to the mounting sleeve (3), the transmission rod of the displacement sensor (11) passes through the valve seat (2), the directional sleeve (9) and the directional air sleeve (13) in sequence, and the end of the transmission rod of the displacement sensor (11) is fixedly connected to the float balloon (17).

2. The gas shut-off valve with automatic air intake and shut-off function according to claim 1 is characterized in that: An electric push rod (10) is installed at the top end of the interior of the mounting sleeve (3), a transmission rod of the electric push rod (10) passes downward through the valve seat (2), and a terminal end of the transmission rod of the electric push rod (10) is fixedly connected to the valve core rod (14), and a controller (4) is installed on the mounting sleeve (3).

3. The gas shut-off valve with automatic air suction and isolation function according to claim 1 is characterized in that: The distance between the floating balloon (17) and the bottom end of the inner wall of the directional air sleeve (13) is smaller than the distance between the floating balloon (17) and the top end of the inner wall of the directional air sleeve (13).

4. The gas shut-off valve with automatic air intake and shut-off function according to claim 1 is characterized in that: The air flow passage is respectively provided as a gas inlet and a gas outlet through a partition opening (5), and the air duct (7) is provided in the air flow passage corresponding to the gas inlet.

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