Fire fighting foam delivery gear pump

Abstract

The application belongs to the technical field of fire-fighting equipment, and particularly discloses a fire-fighting foam conveying gear pump, which comprises a shell structure, a driving gear and a driven gear rotating in the shell structure, and a discharge pipe fixed at a discharge end of the shell structure, an end of the discharge pipe is fixed with a connecting flange, the connecting flange is connected with an external connecting pipe, and a sliding sleeve pipe is slidably arranged in the discharge pipe. In use, the fire-fighting foam extinguishing agent in a high-pressure state drives the sliding sleeve pipe in the discharge pipe to move towards the external connecting pipe, in this process, the internal cavity volume of the discharge pipe is increased, the pressure inside the shell structure is released, the extrusion ring on the sliding sleeve pipe extrudes the extrusion rotating plate, the sealing pipe in a high-pressure state seals the gap between the external connecting pipe and the connecting flange, the fire-fighting foam extinguishing agent is prevented from being discharged from the gap between the external connecting pipe and the connecting flange, and the gear pump can stably convey the fire-fighting foam extinguishing agent.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fire-fighting equipment, and particularly discloses a fire-fighting foam conveying gear pump. BACKGROUND

[0002] In the process of using the fire-fighting foam extinguishing agent, an external gear pump is usually used for conveying. The external gear pump is a rotary pump for conveying liquid by relying on the volume change formed between the pump cylinder and the engaging gear.

[0003] In the actual use process of the external gear pump, the two gears, the pump body and the front and rear covers of the external gear pump can form two closed spaces. When the gears rotate, the volume of the space on the gear disengagement side changes from small to large, and a vacuum state can be formed, so that the fire-fighting foam extinguishing agent can be sucked into the pump body. The volume of the space on the gear engagement side changes from large to small, so that the fire-fighting foam extinguishing agent can be extruded into the pipeline. The suction chamber and the discharge chamber are separated by the engagement line of the two gears. The pressure at the outlet of the external gear pump depends entirely on the resistance at the outlet of the pump.

[0004] However, the external gear pump can indeed stably convey the fire-fighting foam extinguishing agent to the fire site during work, but it still has some deficiencies in actual use, such as:

[0005] In order to ensure the continuous and stable rotation of the gears and effectively isolate the suction and compression cavities, the coincidence degree coefficient of the gear engagement needs to meet the specified requirements during the manufacturing of the external gear pump. As a result, when the front pair of gear teeth has not yet disengaged, the rear pair of gear teeth has already started to engage, so that when the two pairs of gear teeth simultaneously enter the engagement stage, a closed cavity that is not connected to the suction and compression cavities is formed between the two pairs of gear teeth. The change of this cavity can cause high-pressure impact and cavitation in the pump body, resulting in vibration and noise of the pump body and reducing the service life of the pump body.

[0006] In order to solve such problems, the external gear pump commonly seen on the market is provided with an unloading groove on the pump shell. Although the setting of the unloading groove can solve the above problems, it can also cause the fire-fighting foam extinguishing agent to frequently flow in the unloading groove. If the external gear pump is not maintained in time after use, the fire-fighting foam extinguishing agent is easy to be in the unloading groove. In addition, the setting of the unloading groove in the internal part of the external gear pump can also reduce the volume efficiency of the pump body and reduce the flow rate of the pump body.

[0007] Therefore, the application provides a fire-fighting foam conveying gear pump to solve the problem of high-pressure impact and cavitation of the external gear pump. SUMMARY

[0008] Therefore, the application provides a fire-fighting foam conveying gear pump to solve the problem of high-pressure impact and cavitation of the external gear pump.

[0009] To achieve the above object, the application provides a fire-fighting foam delivery gear pump, which comprises a shell structure, a driving gear and a driven gear rotating in the shell structure, a discharge pipe fixed at the discharge end of the shell structure, a connecting flange fixed at the end of the discharge pipe, and an external connecting pipe connected to the connecting flange.

[0010] The inside of the discharge pipe is slidably provided with a sliding sleeve pipe, the sliding sleeve pipe is fixed with an extrusion ring, the extrusion ring is abutted with an extrusion rotating plate, the upper side of the extrusion rotating plate is rotatably provided with a connecting rotating seat, the upper end of the connecting rotating seat is fixed with the discharge pipe, the connecting flange is embedded with a sealing pipe, the sealing pipe is integrally fixed with an extrusion pipe, the extrusion pipe is abutted with the extrusion rotating plate, the end of the extrusion rotating plate away from the extrusion pipe is fixed with an elastic pull piece, and the elastic pull piece is fixed with the inner wall of the discharge pipe.

[0011] In the above technical scheme, further, the end of the external connecting pipe is abutted with the sealing pipe, the inside of the external connecting pipe is inserted with an insertion ring, the insertion ring is integrally fixed with the connecting flange, an included angle is arranged between the extrusion rotating plate and the insertion ring, the extrusion ring slides on the extrusion rotating plate, and the elastic pull piece has elasticity.

[0012] In the above technical scheme, further, the inner wall of the discharge pipe is provided with a sliding groove near the sliding sleeve pipe, the inside of the sliding groove is equidistantly provided with sliding rods, the sliding sleeve pipe is fixed with a sliding ring near the sliding groove, the sliding ring is sleeved on the sliding rods, the sliding rods are sleeved with connecting springs, and the connecting springs are abutted with the sliding ring.

[0013] In the above technical scheme, further, the sliding sleeve pipe is a horn-shaped structure, the inner diameter of the sliding sleeve pipe near one end of the external connecting pipe is smaller than the inner diameter of the sliding sleeve pipe near one end of the discharge pipe, the sliding sleeve pipe near one end of the discharge pipe is sleeved with a sealing abutting ring, and the sealing abutting ring is always abutted with the inner wall of the discharge pipe.

[0014] In the above technical scheme, further, the discharge pipe is fixed with an abutting ring, the side of the abutting ring away from the external connecting pipe is abutted with the shell structure, and the inner cavity of the discharge pipe is communicated with the inner cavity of the shell structure.

[0015] In the above technical scheme, further, the side of the shell structure away from the discharge pipe is fixed with a receiving pipe, the inner cavity of the receiving pipe is communicated with the inner cavity of the shell structure, and the receiving pipe and the discharge pipe are oppositely arranged.

[0016] In the above technical scheme, further, the shell structure is fixed with a fixed plate, one end of the driving gear is fixed with an external connecting shaft, and the external connecting shaft penetrates through the shell structure and the fixed plate.

[0017] In the above technical scheme, further, the transmission gear and the driven gear are meshed and connected, the first rotating rod is fixed on the transmission gear, and the first rotating rod is rotationally connected with the shell structure.

[0018] In the above technical scheme, further, the second rotating rod is fixed on the driven gear, the second rotating rod is rotationally connected with the shell structure, and the transmission gear drives the driven gear to rotate inside the shell structure.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The transmission gear and the driven gear in the gear pump are meshed and connected, when the transmission gear drives the driven gear to rotate, the side of the shell structure close to the discharge pipe is in a high-pressure state, at this time, the fire-fighting foam extinguishing agent inside the shell structure can be discharged into the inside of the discharge pipe under the extrusion of the transmission gear and the driven gear, at the same time, the inside of the shell structure, away from the discharge pipe, is in a negative pressure state, in this process, the fire-fighting foam extinguishing agent outside the shell structure can be sucked into the inside of the shell structure, realizing stable delivery of the fire-fighting foam extinguishing agent through the gear pump.

[0021] 2、The sliding sleeve pipe in the gear pump, when in use, the fire-fighting foam extinguishing agent in a high-pressure state can drive the sliding sleeve pipe inside the discharge pipe to move in the direction of the external connecting pipe, in this process, the internal cavity volume of the discharge pipe can increase, which can release the pressure inside the shell structure, at the same time, the extrusion ring on the sliding sleeve pipe can extrude the extrusion vane, at this time, the extrusion vane can extrude the extrusion pipe, the sealing pipe in a high-pressure state can seal the gap between the external connecting pipe and the connecting flange, avoiding the fire-fighting foam extinguishing agent from being discharged from the gap between the external connecting pipe and the connecting flange, which can ensure stable pressure delivery of the fire-fighting foam extinguishing agent by the gear pump.

[0022] 3、When the sliding sleeve pipe in the gear pump moves in the direction of the external connecting pipe, the connecting spring on the sliding rod can be extruded, when the fire-fighting foam extinguishing agent inside the sliding sleeve pipe is in a low-pressure state, the connecting spring after force storage can drive the sliding sleeve pipe to reset through the sliding ring, thereby realizing the fire-fighting foam extinguishing agent inside the shell structure in a stable pressure state, further improving the stable pressure delivery of the fire-fighting foam extinguishing agent by the gear pump.

[0023] 4、The sliding sleeve pipe in the gear pump is provided as a horn-shaped structure, which can realize the fire-fighting foam extinguishing agent in a high-pressure state to drive the sliding sleeve pipe to move in the direction of the external connecting pipe, at the same time, the sealing abutment ring is always abutted with the discharge pipe, which can realize the fire-fighting foam extinguishing agent inside the discharge pipe to stably flow into the inside of the sliding sleeve pipe, avoiding the external connecting pipe and the connecting flange to be unstably connected when the fire-fighting foam extinguishing agent in a high-pressure state directly impacts the external connecting pipe, further realizing the stable delivery of the fire-fighting foam extinguishing agent through the gear pump. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the present application;

[0025] Figure 2 is a distribution schematic diagram of the driven gear and the transmission gear in the present application;

[0026] Figure 3 is a distribution schematic diagram of the sliding sleeve pipe and the discharge pipe in the present application;

[0027] Figure 4 is a use state schematic diagram of the sliding sleeve pipe in the present application;

[0028] Figure 5 is a connection structure diagram of the extrusion ring and the sliding sleeve pipe in the present application;

[0029] Figure 6 is a connection structure diagram of the extrusion rotating piece and the discharge pipe in the present application;

[0030] Figure 7 is Figure 3 an enlarged view of A in the present application;

[0031] Figure 8 is Figure 3 an enlarged view of B in the present application.

[0032] 1, external shaft; 2, shell structure; 3, discharge pipe; 31, abutting ring; 32, plug-in ring; 33, connection flange; 34, sliding groove; 35, sliding rod; 36, connecting spring; 37, extrusion rotating piece; 38, connecting rotating seat; 39, elastic pull piece; 4, external pipe; 5, transmission gear; 6, driven gear; 7, storage pipe; 8, sliding sleeve pipe; 81, extrusion ring; 82, sliding ring; 83, sealing abutting ring; 9, sealing pipe; 91, extrusion pipe; 10, fixed plate; 11, first rotating rod; 12, second rotating rod. DETAILED DESCRIPTION

[0033] In order to enable the above-mentioned objects, features and advantages of the present application to be more clearly understood, the present application will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] Embodiment one: please refer to Figures 1-8 the present application provides a technical solution:

[0036] The application discloses a fire-fighting foam conveying gear pump which comprises a shell structure 2, a driving gear 5 and a driven gear 6 which rotate in the shell structure 2, a discharge pipe 3 fixed to the discharge end of the shell structure 2, a connecting flange 33 fixed to the end of the discharge pipe 3 and an external connecting pipe 4 connected to the connecting flange 33.

[0037] The driving gear 5 and the driven gear 6 are in meshing connection, when the driving gear 5 drives the driven gear 6 to rotate, the side of the shell structure 2 close to the discharge pipe 3 is in a high-pressure state, at this time, the fire-fighting foam extinguishing agent in the shell structure 2 can be discharged into the discharge pipe 3 under the extrusion of the driving gear 5 and the driven gear 6, meanwhile, the side of the shell structure 2 away from the discharge pipe 3 is in a negative pressure state, in this process, the fire-fighting foam extinguishing agent outside the shell structure 2 can be sucked into the shell structure 2.

[0038] When the driving gear 5 and the driven gear 6 drive the fire-fighting foam extinguishing agent in the shell structure 2 to be conveyed into the discharge pipe 3, a pressure-unbalanced cavity is easily formed around the driving gear 5 and the driven gear 6, in order to solve the above problem, the following structure is provided.

[0039] Embodiment two: please refer to Figures 1-8 As shown in the figure, based on the basis of embodiment one, the application provides a technical scheme, which is different from embodiment one, in the embodiment, the sliding sleeve pipe 8 in the high-pressure state of the fire-fighting foam extinguishing agent can drive the sliding sleeve pipe 8 in the discharge pipe 3 to move towards the external connecting pipe 4, in this process, the internal cavity volume of the discharge pipe 3 can be increased, so that the internal pressure of the shell structure 2 can be released, meanwhile, the extrusion ring 81 on the sliding sleeve pipe 8 can extrude the extrusion rotating piece 37, at this time, the extrusion rotating piece 37 can extrude the extrusion pipe 91, the sealing pipe 9 in the high-pressure state can seal the gap between the external connecting pipe 4 and the connecting flange 33, so that the fire-fighting foam extinguishing agent is prevented from being discharged from the gap between the external connecting pipe 4 and the connecting flange 33.

[0040] The sliding sleeve pipe 8 is slidably arranged in the discharge pipe 3, the extrusion ring 81 is fixed to the sliding sleeve pipe 8, the extrusion rotating piece 37 is abutted to the extrusion ring 81, the connecting rotating seat 38 is rotatably arranged on the upper side of the extrusion rotating piece 37, the upper end of the connecting rotating seat 38 is fixed to the discharge pipe 3, the sealing pipe 9 is embedded in the connecting flange 33, the extrusion pipe 91 is integrally fixed to the sealing pipe 9, the extrusion pipe 91 is abutted to the extrusion rotating piece 37, the elastic pulling piece 39 is fixed to the end of the extrusion rotating piece 37 away from the extrusion pipe 91, and the elastic pulling piece 39 is fixed to the inner wall of the discharge pipe 3.

[0041] When the transmission gear 5 and the driven gear 6 drive the fire-fighting foam extinguishing agent in the shell structure 2 to be transported to the inside of the discharge pipe 3, if the pressure of the inside of the shell structure 2 near the discharge pipe 3 is too large, the fire-fighting foam extinguishing agent in the high-pressure state can drive the sliding sleeve pipe 8 to move to the direction of the external connecting pipe 4, in this process, the internal cavity volume of the discharge pipe 3 can be increased, so that the pressure of the inside of the shell structure 2 near the discharge pipe 3 is reduced, and the service life of the gear pump is prolonged.

[0042] When the fire-fighting foam extinguishing agent in the high-pressure state drives the sliding sleeve pipe 8 to move to the direction of the external connecting pipe 4, the extrusion ring 81 can extrude the extrusion turning piece 37, in this process, the extrusion turning piece 37 can extrude the extrusion pipe 91, at this time, the inside of the sealing pipe 9 is in a high-pressure state, and the sealing pipe 9 in the high-pressure state can seal the gap between the external connecting pipe 4 and the connecting flange 33, so that the fire-fighting foam extinguishing agent in the high-pressure state can be prevented from being discharged from the gap between the external connecting pipe 4 and the connecting flange 33.

[0043] Embodiment three: please refer to Figures 1-8 As shown in the figure, based on the basis of embodiment one, the application provides a technical scheme, which is different from embodiment one, that is, when the sliding sleeve pipe 8 in the embodiment moves to the direction of the external connecting pipe 4, the connecting spring 36 on the sliding rod 35 can be extruded, when the fire-fighting foam extinguishing agent in the inside of the sliding sleeve pipe 8 is in a low-pressure state, the connecting spring 36 after storing force can drive the sliding sleeve pipe 8 to reset through the sliding ring 82, so that the fire-fighting foam extinguishing agent in the inside of the shell structure 2 is in a stable pressure state.

[0044] The end of the external connecting pipe 4 abuts against the sealing pipe 9, the inside of the external connecting pipe 4 is inserted with the insertion ring 32, the insertion ring 32 and the connecting flange 33 are integrally fixed, an included angle is arranged between the extrusion turning piece 37 and the insertion ring 32, the extrusion ring 81 slides on the extrusion turning piece 37, and the elastic pull piece 39 has elasticity;

[0045] When the fire-fighting foam extinguishing agent in the high-pressure state drives the sliding sleeve pipe 8 to move to the direction of the external connecting pipe 4, the sliding sleeve pipe 8 can drive the extrusion ring 81 to extrude the extrusion turning piece 37, at this time, the extrusion turning piece 37 can be flipped around the connecting turning seat 38, the flipped extrusion turning piece 37 can pull the elastic pull piece 39, and the elastic pull piece 39 subjected to the pulling can store force, when the extrusion ring 81 does not extrude the extrusion turning piece 37, the repulsive force generated by the elastic pull piece 39 can drive the extrusion turning piece 37 to reset, so that the extrusion turning piece 37 does not extrude the extrusion pipe 91.

[0046] The inner wall of the discharge pipe 3 is provided with a sliding groove 34 near the sliding sleeve pipe 8, and the sliding groove 34 is provided with sliding rods 35 at equal intervals, and the sliding sleeve pipe 8 is provided with a sliding ring 82 near the sliding groove 34, the sliding ring 82 is sleeved on the sliding rod 35, and the sliding rod 35 is sleeved with a connecting spring 36, and the connecting spring 36 and the sliding ring 82 abut;

[0047] When the high-pressure fire-fighting foam extinguishing agent drives the sliding sleeve pipe 8 to move towards the outer connecting pipe 4, the sliding sleeve pipe 8 can drive the sliding ring 82 to slide on the sliding rod 35, and the connecting spring 36 can be extruded, and the extruded connecting spring 36 can work in a force storage mode, and when the fire-fighting foam extinguishing agent in the sliding sleeve pipe 8 is in a low-pressure state, the force-stored connecting spring 36 can drive the sliding sleeve pipe 8 to reset through the sliding ring 82, so that the fire-fighting foam extinguishing agent in the shell structure 2 is in a stable pressure state:

[0048] Embodiment four: please refer to Figures 1-8 As shown, based on the basis of embodiment one, the present application provides a technical scheme, which is different from embodiment one, wherein the sliding sleeve pipe 8 in the embodiment is provided in a horn-shaped structure, which can drive the sliding sleeve pipe 8 to move towards the outer connecting pipe 4 in a high-pressure state, and the sealing abutment ring 83 is always abutted with the discharge pipe 3, so that the fire-fighting foam extinguishing agent in the discharge pipe 3 can stably flow into the inside of the sliding sleeve pipe 8, and the outer connecting pipe 4 and the connecting flange 33 are not stably connected when the high-pressure fire-fighting foam extinguishing agent directly impacts the outer connecting pipe 4.

[0049] The sliding sleeve pipe 8 is in a horn-shaped structure, the inner diameter of the end of the sliding sleeve pipe 8 near the outer connecting pipe 4 is smaller than the inner diameter of the end of the sliding sleeve pipe 8 near the discharge pipe 3, and the end of the sliding sleeve pipe 8 near the discharge pipe 3 is sleeved with a sealing abutment ring 83, and the sealing abutment ring 83 is always abutted with the inner wall of the discharge pipe 3;

[0050] The sliding sleeve pipe 8 is provided in a horn-shaped structure, which can drive the sliding sleeve pipe 8 to move towards the outer connecting pipe 4 in a high-pressure state, and the sealing abutment ring 83 is always abutted with the discharge pipe 3, so that the fire-fighting foam extinguishing agent in the discharge pipe 3 can stably flow into the inside of the sliding sleeve pipe 8, and the outer connecting pipe 4 and the connecting flange 33 are not stably connected when the high-pressure fire-fighting foam extinguishing agent directly impacts the outer connecting pipe 4.

[0051] The discharge pipe 3 is fixed with an abutment ring 31, the side of the abutment ring 31 away from the outer connecting pipe 4 is abutted with the shell structure 2, and the inner cavity of the discharge pipe 3 is communicated with the inner cavity of the shell structure 2;

[0052] When the abutment ring 31 is abutted in the inside of the shell structure 2, the gap between the shell structure 2 and the discharge pipe 3 can be sealed, so that the fire-fighting foam extinguishing agent cannot flow out from the gap between the shell structure 2 and the discharge pipe 3.

[0053] The side of the shell structure 2 away from the discharge pipe 3 is fixed with a receiving pipe 7, the inner cavity of the receiving pipe 7 and the inner cavity of the shell structure 2 are communicated, and the receiving pipe 7 and the discharge pipe 3 are oppositely arranged;

[0054] When the transmission gear 5 drives the driven gear 6 to rotate, the side of the shell structure 2 close to the discharge pipe 3 is in a high-pressure state, at this time, the fire-fighting foam extinguishing agent in the shell structure 2 can be discharged into the interior of the discharge pipe 3 under the extrusion of the transmission gear 5 and the driven gear 6, and the interior of the shell structure 2, the side away from the discharge pipe 3 is in a negative pressure state, in this process, the fire-fighting foam extinguishing agent outside the shell structure 2 can be sucked into the interior of the shell structure 2 through the receiving pipe 7.

[0055] The shell structure 2 is fixed with a fixed plate 10, one end of the transmission gear 5 is fixed with an external shaft 1, and the external shaft 1 penetrates through the shell structure 2 and the fixed plate 10.

[0056] The transmission gear 5 and the driven gear 6 are meshingly connected, the transmission gear 5 is fixed with a first rotating rod 11, and the first rotating rod 11 is rotationally connected with the shell structure 2.

[0057] The driven gear 6 is fixed with a second rotating rod 12, the second rotating rod 12 is rotationally connected with the shell structure 2, and the transmission gear 5 drives the driven gear 6 to rotate in the interior of the shell structure 2.

[0058] In actual use, the staff can connect the external shaft 1 with the output shaft of the external motor, the output shaft of the external motor can drive the transmission gear 5 to rotate through the external shaft 1, and the transmission gear 5 can drive the driven gear 6 to rotate, thereby realizing the transmission gear 5 cooperating with the driven gear 6 to deliver the fire-fighting foam extinguishing agent.

[0059] Working principle: in actual use, the transmission gear 5 and the driven gear 6 are meshingly connected, when the transmission gear 5 drives the driven gear 6 to rotate, the side of the shell structure 2 close to the discharge pipe 3 is in a high-pressure state, at this time, the fire-fighting foam extinguishing agent in the shell structure 2 can be discharged into the interior of the discharge pipe 3 under the extrusion of the transmission gear 5 and the driven gear 6, and the interior of the shell structure 2, the side away from the discharge pipe 3 is in a negative pressure state, in this process, the fire-fighting foam extinguishing agent outside the shell structure 2 can be sucked into the interior of the shell structure 2 through the receiving pipe 7.

[0060] When the transmission gear 5 and the driven gear 6 drive the fire-fighting foam extinguishing agent in the interior of the shell structure 2 to be delivered into the interior of the discharge pipe 3, an uneven pressure cavity is easily formed around the transmission gear 5 and the driven gear 6, in order to solve the above problem, the following structure is proposed;

[0061] When the transmission gear 5 and the driven gear 6 drive the fire-fighting foam extinguishing agent in the shell structure 2 to be transported to the inside of the discharge pipe 3, if the pressure of the inside of the shell structure 2 near the discharge pipe 3 is too large, the fire-fighting foam extinguishing agent in the high-pressure state can drive the sliding sleeve pipe 8 inside the discharge pipe 3 to move towards the direction of the external connecting pipe 4, in this process, the internal cavity volume of the discharge pipe 3 can be increased, so that the pressure of the inside of the shell structure 2 near the discharge pipe 3 is reduced, thereby prolonging the service life of the gear pump;

[0062] When the fire-fighting foam extinguishing agent in the high-pressure state drives the sliding sleeve pipe 8 to move towards the direction of the external connecting pipe 4, the extrusion ring 81 can extrude the extrusion rotating piece 37, in this process, the extrusion rotating piece 37 can extrude the extrusion pipe 91, at this time, the inside of the sealing pipe 9 is in a high-pressure state, and the sealing pipe 9 in the high-pressure state can seal the gap between the external connecting pipe 4 and the connecting flange 33, so that the fire-fighting foam extinguishing agent in the high-pressure state can be prevented from being discharged from the gap between the external connecting pipe 4 and the connecting flange 33;

[0063] When the fire-fighting foam extinguishing agent in the high-pressure state drives the sliding sleeve pipe 8 to move towards the direction of the external connecting pipe 4, the sliding sleeve pipe 8 can drive the extrusion ring 81 to extrude the extrusion rotating piece 37, at this time, the extrusion rotating piece 37 can be flipped around the connecting rotating seat 38, and the flipped extrusion rotating piece 37 can pull the elastic pull piece 39, and the elastic pull piece 39 subjected to the pulling can work in a force storage mode, when the extrusion ring 81 does not extrude the extrusion rotating piece 37, the repulsive force generated by the elastic pull piece 39 can drive the extrusion rotating piece 37 to reset, thereby realizing that the extrusion rotating piece 37 does not extrude the extrusion pipe 91;

[0064] When the fire-fighting foam extinguishing agent in the high-pressure state drives the sliding sleeve pipe 8 to move towards the direction of the external connecting pipe 4, the sliding sleeve pipe 8 can drive the sliding ring 82 to slide on the sliding rod 35, and the connecting spring 36 can be subjected to extrusion, the connecting spring 36 subjected to the extrusion can work in a force storage mode, when the fire-fighting foam extinguishing agent in the sliding sleeve pipe 8 is in a low-pressure state, the connecting spring 36 in the force storage mode can drive the sliding sleeve pipe 8 to reset through the sliding ring 82, thereby realizing that the fire-fighting foam extinguishing agent in the inside of the shell structure 2 is in a stable pressure state;

[0065] The sliding sleeve pipe 8 is arranged in a horn-shaped structure, which can realize that the fire-fighting foam extinguishing agent in the high-pressure state drives the sliding sleeve pipe 8 to move towards the direction of the external connecting pipe 4, and the sealing abutting ring 83 is always abutted with the discharge pipe 3, which can realize that the fire-fighting foam extinguishing agent in the inside of the discharge pipe 3 stably flows into the inside of the sliding sleeve pipe 8, and can avoid that the external connecting pipe 4 and the connecting flange 33 are not stably connected when the fire-fighting foam extinguishing agent in the high-pressure state directly impacts the external connecting pipe 4.

[0066] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A fire-fighting foam delivery gear pump comprising a housing structure (2) and a drive gear wheel (5) and a driven gear wheel (6) rotating inside the housing structure (2), characterized in that: The discharge end of the shell structure (2) is fixed with a discharge pipe (3), the end of the discharge pipe (3) is fixed with a connecting flange (33), and the connecting flange (33) is connected with an external pipe (4); The inside of the discharge pipe (3) is slidably provided with a sliding sleeve pipe (8), the sliding sleeve pipe (8) is fixed with an extrusion ring (81), the extrusion ring (81) is abutted with an extrusion rotating piece (37), the connecting flange (33) is embedded with a sealing pipe (9), the sealing pipe (9) is integrally fixed with an extrusion pipe (91), the extrusion pipe (91) and the extrusion rotating piece (37) are abutted, one end of the extrusion rotating piece (37) away from the extrusion pipe (91) is fixed with an elastic pull piece (39), the elastic pull piece (39) and the inner wall of the discharge pipe (3) are fixed, the end of the external pipe (4) is abutted with the sealing pipe (9), the inside of the external pipe (4) is inserted with an insertion ring (32), the insertion ring (32) and the connecting flange (33) are integrally fixed, an included angle is arranged between the extrusion rotating piece (37) and the insertion ring (32), and the extrusion ring (81) slides on the extrusion rotating piece (37); The inner wall of the discharge pipe (3) is provided with a sliding groove (34) near the sliding sleeve pipe (8), the inside of the sliding groove (34) is equally spacedly provided with sliding rods (35), the sliding sleeve pipe (8) is fixed with a sliding ring (82) near the sliding groove (34), the sliding ring (82) is sleeved on the sliding rod (35), and the sliding rod (35) is sleeved with a connecting spring (36), and the connecting spring (36) and the sliding ring (82) are abutted; The sliding sleeve pipe (8) is a horn-shaped structure, the inner diameter of the sliding sleeve pipe (8) near one end of the external pipe (4) is smaller than the inner diameter of the sliding sleeve pipe (8) near one end of the discharge pipe (3), the sliding sleeve pipe (8) near one end of the discharge pipe (3) is sleeved with a sealing abutting ring (83), the sealing abutting ring (83) is always abutted with the inner wall of the discharge pipe (3), when the high-pressure fire-fighting foam extinguishing agent drives the sliding sleeve pipe (8) to move towards the external pipe (4), the sliding sleeve pipe (8) can drive the extrusion ring (81) to extrude the extrusion rotating piece (37), at this time, the extrusion rotating piece (37) can be flipped with the connecting rotating seat (38) as the center, the flipped extrusion rotating piece (37) can pull the elastic pull piece (39), the elastic pull piece (39) subjected to pulling can work in a force storage mode, when the extrusion ring (81) does not extrude the extrusion rotating piece (37), the repulsive force generated by the elastic pull piece (39) can drive the extrusion rotating piece (37) to reset, thereby realizing that the extrusion rotating piece (37) does not extrude the extrusion pipe (91).

2. A fire-fighting foam delivery gear pump according to claim 1, characterised in that, The discharge pipe (3) is fixed with an abutting ring (31), one side of the abutting ring (31) away from the external pipe (4) is abutted with the shell structure (2), and the inner cavity of the discharge pipe (3) is communicated with the inner cavity of the shell structure (2).

3. A fire fighting foam delivery gear pump according to claim 1, wherein, The side of the shell structure (2) away from the discharge pipe (3) is fixed with a receiving pipe (7), the inner cavity of the receiving pipe (7) is communicated with the inner cavity of the shell structure (2), and the receiving pipe (7) and the discharge pipe (3) are oppositely arranged.

4. A fire-fighting foam delivery gear pump according to claim 1, characterised in that, The shell structure (2) is fixed with a fixed plate (10), one end of the transmission gear (5) is fixed with an external shaft (1), the external shaft (1) penetrates the shell structure (2) and the fixed plate (10).

5. A fire-fighting foam delivery gear pump according to claim 1, wherein, The transmission gear (5) and the driven gear (6) are meshed and connected, the transmission gear (5) is fixed with a first rotating rod (11), and the first rotating rod (11) is rotationally connected with the shell structure (2).

6. A fire-fighting foam delivery gear pump according to claim 1, wherein, The driven gear (6) is fixed with a second rotating rod (12), the second rotating rod (12) is rotationally connected with the shell structure (2), and the transmission gear (5) drives the driven gear (6) to rotate in the shell structure (2).

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