Positive pressure cab of tractor

Abstract

The utility model belongs to the technical field of agricultural machinery cabs, and discloses a positive pressure cab of a tractor. The cab comprises a cab body and a top cover assembly, the top cover assembly is mounted on the upper side of the cab body, an interlayer is formed in the top cover assembly, a fresh air fan and an air conditioner are mounted in the interlayer, an air duct is mounted in the interlayer, the fresh air fan is mounted in the air duct, and the outside of the cab body is communicated with the inside of the cab body through the air duct. An air suction opening of the air conditioner communicates with the interior of the cab body, an air outlet of the air conditioner communicates with the interior of the cab body, the fresh air fan sucks outside air into an interlayer in the cab body, and a filter element is installed in the air channel. The problem that in the prior art, pressure in a positive-pressure cab is insufficient is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery cabs, in particular to a positive-pressure cab for a tractor. Background Technique

[0002] Tractors work in the wild for a long time with long working hours and high working intensity. There is a large amount of dust in the outside world, and the dust will enter the cab along the gaps, resulting in a poor working environment for tractor drivers.

[0003] Currently, the air volume of the air-conditioning device in the cab is increased to increase the air pressure, but the wind force that the air conditioner can maintain is limited. The pressure inside the cab is higher than the outside environment, and dust cannot enter the cab. However, under the existing technology, the air in the positive-pressure cab needs to pass through the evaporator of the air conditioner first and then enter the cab interior. This will increase the resistance of the air conditioner to suck in air, and the flow rate into the cab interior is low, resulting in frequent problems of insufficient pressure in the cab. Due to the insufficient pressure difference between the inside and outside of the cab, dust will continue to enter the cab, affecting the health of the driver. Content of the Utility Model

[0004] The purpose of the utility model is to provide a positive-pressure cab for a tractor to solve the problem of insufficient pressure in the positive-pressure cab under the existing technology.

[0005] To achieve this purpose, the utility model adopts the following technical solutions: The utility model provides a positive-pressure cab for a tractor, which includes a cab main body and a top cover assembly. The top cover assembly is installed on the upper side of the cab main body. A sandwich layer is formed inside the top cover assembly. A fresh air fan and an air conditioner are installed in the sandwich layer. An air duct is installed in the sandwich layer. The fresh air fan is installed in the air duct. The air duct connects the outside of the cab main body with the inside of the cab main body. The air suction port of the air conditioner is connected to the inside of the cab main body, and the air outlet of the air conditioner is connected to the inside of the cab main body. The fresh air fan pumps outside air into the sandwich layer inside the cab main body, and a filter element is installed in the air duct.

[0006] Preferably, the top cover assembly includes an upper top and a lower top. A sandwich layer is installed between the upper top and the lower top. The fresh air fan is installed in the sandwich layer near the left door and the right door of the cab main body, and the fresh air fan corresponds to the air duct one by one.

[0007] Preferably, a sealing sponge is laid near the interior of the lower top, and a sealing sponge is also laid inside the sandwich layer.

[0008] Preferably, the cab body is welded together by left side panel welding, right side panel welding, floor welding, front panel welding, rear panel welding, top front crossbeam welding, top middle crossbeam welding and top rear crossbeam welding. A floor is laid on the floor welding, and sealant is applied to the gap between the floor and the cab body.

[0009] Preferably, a left door is installed on the left side panel welding. Sealant is applied to the edge of the left door, and sealant is clamped between the left door and the left side panel welding. A right door is installed on the right side panel welding. Sealant is applied to the edge of the right door, and sealant is clamped between the right door and the right side panel welding.

[0010] Preferably, a windshield is fixed by sealant in the hollowed-out area in the middle of the front panel welding, and a rear windshield is fixed by sealant in the hollowed-out area in the middle of the rear panel welding.

[0011] Preferably, a controller is installed inside the cab body. The controller is electrically connected to the fresh air fan through a cable. A differential pressure sensor is installed inside the cab body. The differential pressure sensor can measure the air pressure difference between the inside and outside of the cab body, and the differential pressure sensor is electrically connected to the controller.

[0012] Preferably, the controller is electrically connected to the air conditioner through a cable, and the controller is also electrically connected to a key panel through a cable. A temperature adjustment knob is provided on the panel, and a fan on button and a fan off button are also provided on the panel.

[0013] Preferably, the cable is wrapped with a sealing sleeve, and the sealing sleeve is in interference fit with the cable.

[0014] Preferably, the air conditioner includes an evaporator. The evaporator is installed in the interlayer. A maintenance opening is provided on the upper top corresponding to the evaporator. A maintenance cover is rotatably installed on one side of the maintenance opening, and sealing cotton is laid on the side of the maintenance cover close to the interlayer.

[0015] Advantageous effects: When the air pressure inside the cab is relatively low, by turning on the fresh air fan, the air passes through the filter and enters the cab interior, adjusting the pressure inside the cab to increase, increasing the pressure difference between the inside and outside of the cab, preventing external dust from entering the cab interior, protecting the health of the driver, and at the same time, the air conditioner only absorbs the air inside the cab, reducing the suction resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a top view of the cab body of the present invention;

[0017] Figure 2It is the front view of the windshield of the present utility model;

[0018] Figure 3 It is the internal side view of the cab body of the present utility model;

[0019] Figure 4 It is the internal main view of the cab body of the present utility model.

[0020] In the figure: 1. Cab body; 2. Fresh air fan; 3. Evaporator; 4. Upper top; 5. Lower top; 6. Left door; 7. Right door; 8. Front windshield; 9. Rear windshield; 10. Button panel; 11. Air duct; 12. Maintenance cover; 13. Filter element; 14. Differential pressure sensor. Specific embodiments

[0021] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0022] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0024] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0025] Under the prior art, an air conditioner is installed inside the cab. By sucking air through the air conditioner, the air volume entering the interior of the cab is increased. Furthermore, the air pressure inside the cab can be increased, making the air pressure inside the cab higher than that outside. However, after the fresh air from outside passes through the evaporator of the air conditioner and enters the cab, the resistance of the air becomes larger and the air flow rate becomes lower. Therefore, the air pressure inside the cab cannot form an obvious difference from the air pressure outside, resulting in dust entering the cab and affecting the health of the driver.

[0026] To solve the above problems, as Figures 1 to 4 shown, the present utility model provides a positive-pressure cab for a tractor, which includes a cab main body 1 and a top cover assembly. The top cover assembly is installed on the upper side of the cab main body 1. A sandwich layer is formed inside the top cover assembly. A fresh air fan 2 and an air conditioner are installed inside the sandwich layer. An air duct 11 is installed inside the sandwich layer. The fresh air fan 2 is installed inside the air duct 11. The air duct 11 connects the outside of the cab main body 1 with the inside of the cab main body 1. The air suction port of the air conditioner is connected with the inside of the cab main body 1, and the air outlet of the air conditioner is connected with the inside of the cab main body 1. The fresh air fan 2 sucks the outside air into the sandwich layer inside the cab main body 1, and a filter element 13 is installed inside the air duct 11.

[0027] When the air pressure inside the cab is insufficient, the fresh air fan 2 conveys air into the cab. The outside air is driven by the fresh air fan 2, passes through the filter and enters the cab interior. Since the outside air is accelerated by the fresh air fan 2 and then enters the cab interior along the air duct 11 after passing through the filter, the resistance encountered by the outside air is small, causing the pressure inside the cab to rise rapidly, increasing the air pressure difference between the inside and outside of the cab quickly, preventing the outside dust from invading the cab interior, protecting the health of the driver. At the same time, a filter element 13 is installed inside the air duct 11 to prevent the outside dust from directly entering the cab interior along the air duct 11.

[0028] The top cover assembly of the utility model includes an upper top 4 and a lower top 5, and a sandwich is installed between the upper top 4 and the lower top 5. Fresh air blowers 2 are installed on both sides of the left door 6 and the right door 7 near the main body 1 of the cab in the sandwich, and the fresh air blowers 2 correspond to the air duct 11 one by one. Fresh air blowers 2 are arranged on both sides, and the two fresh air blowers quickly inhale air, increase the air intake inside the cab, and accelerate the speed of increasing the pressure inside the cab. During the operation of the air conditioner, the air conditioner evaporator will directly inhale air from the cab for cooling or heating, and adjust the temperature in the cab. Since the air pressure in the cab is higher than the air pressure outside, the resistance of air entering the cab is relatively large. It requires a large power for the air conditioner to directly inhale air from the outside, while inhaling air from the cab can reduce the air suction resistance. The lower top 5 is paved with sealing cotton near the inside of the cab, and the inside of the sandwich is also paved with sealing cotton. By installing the sealing cotton, the sealing property is increased to prevent external dust from entering the cab from one side of the top cover.

[0029] The cab body 1 is welded together by left side enclosure welding, right side enclosure welding, floor welding, front enclosure welding, rear enclosure welding, top front cross beam welding, top middle cross beam welding and top rear cross beam welding. The cab is also assembled together by the above components in the prior art, which will not be repeated here. The floor is paved on the floor welding, and the gap between the floor and the cab body 1 is coated with sealant. The floor is welded on the floor welding by a flanged overlap structure to improve the connection strength of the floor. Sealant is coated between the floor weldings to make the air tightness inside the cab better and enable the cab to maintain a positive pressure state for a long time.

[0030] A left door 6 is installed on the left side surrounding weld, the edge of the left door 6 is coated with sealant, and sealant is sandwiched between the left door 6 and the left side surrounding weld. A right door 7 is installed on the right side surrounding weld, the edge of the right door 7 is coated with sealant, and sealant is sandwiched between the right door 7 and the right side surrounding weld.

[0031] Sealant is applied to the outer periphery of the left door and the right door. The sealant can maintain the airtightness of the interior of the cab when the left and right doors are closed, so that the interior of the cab can maintain a positive pressure state for a long time.

[0032] The front windshield 8 is fixed to the hollow area in the middle of the welded front enclosure by sealant, and the rear windshield 9 is fixed to the hollow area in the middle of the welded rear enclosure by sealant. Similarly, sealant is also applied to the edges of the front windshield 8 and the rear windshield 9. The sealant can be used to fill the gap between the front windshield 8 and the welded front enclosure to prevent dust from entering from the outside. Similarly, the gap between the rear windshield 9 and the welded rear enclosure can also be filled to make the interior of the cab more airtight and improve the airtightness of the interior of the cab.

[0033] A controller is installed inside the cab body 1. The controller is electrically connected to the fresh air blower 2 through a cable. A differential pressure sensor 14 is installed inside the cab body 1. The differential pressure sensor 14 can measure the air pressure difference between the inside and the outside of the cab body 1. The differential pressure sensor 14 is electrically connected to the controller.

[0034] When the differential pressure sensor 14 detects that the difference between the inside and the outside of the cab is less than the set value, the fresh air blower 2 will automatically start, sucking in air from the outside to increase the air pressure inside the cab. When the differential pressure sensor 14 detects that the difference between the inside and the outside of the cab is greater than the set value, the fresh air blower 2 will automatically turn off.

[0035] The controller is electrically connected to the air conditioner through a cable. The controller is also electrically connected to the key panel 10 through a cable. A temperature adjustment knob is provided on the key panel 10. The key panel 10 is also provided with a blower start button and a blower stop button. By controlling the key panel 10, the temperature of the air conditioner and the on / off of the fresh air blower 2 can be manually controlled.

[0036] If the air conditioner inside the cab needs to be in the external circulation mode, the fresh air blower 2 will start to suck the outside air into the interlayer inside the cab. Then the air conditioner sucks in the air from inside the cab, cools it through the evaporator 3, mixes the outside air with the original cold air inside the cab, and finally discharges it back into the cab. In the external circulation mode of the air conditioner, the working burden of the evaporator 3 can be reduced and energy consumption can be saved. If the air conditioner is in the internal circulation mode, the fresh air blower 2 will be turned off.

[0037] Various cables will be installed around the cab. The outside of the cables is wrapped with a sealing sleeve. The sealing sleeve is in interference fit with the cables, which can prevent external dust from entering the cab along the gap between the cables and the sealing sleeve, making the airtightness of the cab better.

[0038] The air conditioner includes an evaporator 3. The evaporator 3 is installed in the interlayer. The evaporator 3 is provided with a maintenance opening corresponding to the upper top 4. A maintenance cover 12 is rotatably installed on one side of the maintenance opening. A sealing sponge is laid on the side of the maintenance cover 12 close to the interlayer. The gap between the maintenance cover 12 and the evaporator 3 can be filled through the sealing sponge. When the maintenance cover 12 is in the closed state, the gap can be sealed to prevent external dust from invading.

[0039] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A positive-pressure cab for a tractor, characterized in that, The invention comprises a cab body (1) and a top cover assembly, wherein the top cover assembly is installed on the upper side of the cab body (1), a sandwich is formed in the top cover assembly, a fresh air blower (2) and an air conditioner are installed in the sandwich, an air duct (11) is installed in the sandwich, the fresh air blower (2) is installed in the air duct (11), the air duct (11) connects the outside of the cab body (1) with the inside of the cab body (1), the air intake of the air conditioner is connected to the inside of the cab body (1), the air outlet of the air conditioner is connected to the inside of the cab body (1), the fresh air blower (2) draws outside air into the sandwich inside the cab body (1), and a filter element (13) is installed in the air duct (11).

2. The positive-pressure cab of a tractor according to claim 1, wherein The roof assembly comprises an upper roof (4) and a lower roof (5), an interlayer is installed between the upper roof (4) and the lower roof (5), the fresh air fan (2) is installed in the interlayer near the left door (6) and the right door (7) of the cab body (1), and the fresh air fan (2) and the air duct (11) correspond one to one.

3. The positive-pressure cab of a tractor according to claim 2, characterized in that, The lower top (5) is paved with sealing cotton near the interior of the cab, and the interior of the interlayer is also paved with sealing cotton.

4. The positive-pressure cab of the tractor according to claim 1, wherein, The cab body (1) is welded together by left side enclosure welding, right side enclosure welding, floor welding, front enclosure welding, rear enclosure welding, top front cross beam welding, top middle cross beam welding and top rear cross beam welding, a floor is laid on the floor welding, and a sealant is applied in the gap between the floor and the cab body (1).

5. The positive-pressure cab of a tractor according to claim 4, characterized in that, A left door (6) is mounted on the left side welded joint, the edge of the left door (6) is coated with sealant, and sealant is sandwiched between the left door (6) and the left side welded joint; a right door (7) is mounted on the right side welded joint, the edge of the right door (7) is coated with sealant, and sealant is sandwiched between the right door (7) and the right side welded joint.

6. The positive-pressure cab of a tractor according to claim 4, characterized in that The front enclosure is welded to a hollow middle area with a front windshield (8) fixed thereto by means of a sealant, and the rear enclosure is welded to a hollow middle area with a rear windshield (9) fixed thereto by means of a sealant.

7. The positive-pressure cab of the tractor according to claim 1, wherein A controller is installed in the cab body (1), and the controller is electrically connected to the fresh air blower (2) via a cable. A pressure difference sensor (14) is installed in the cab body (1), and the pressure difference sensor (14) can measure the air pressure difference between the inside of the cab body (1) and the outside of the cab body (1). The pressure difference sensor (14) is electrically connected to the controller.

8. The positive-pressure cab of the tractor according to claim 7, characterized in that, The controller is electrically connected to the air conditioner via a cable, and the controller is also electrically connected to a key panel (10) via a cable; a temperature adjustment knob is provided on the key panel (10); and a fan on button and a fan off button are also provided on the key panel (10).

9. The positive-pressure cab of a tractor according to claim 8, characterized in that, The outer side of the cable is wrapped with a sealing sleeve, and the sealing sleeve is interference fit with the cable.

10. The positive-pressure cab of the tractor according to claim 2, characterized in that, The air conditioner includes an evaporator (3), the evaporator (3) is installed in the interlayer, the evaporator (3) is provided with a maintenance opening corresponding to the upper top (4), a maintenance cover (12) is rotatably installed on one side of the maintenance opening, and a sealing sponge is laid on the side of the maintenance cover (12) close to the interlayer.

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