Bidirectional ventilation valve and cab lifting oil tank

Abstract

According to the bidirectional ventilation valve and the cab lifting oil tank, the bidirectional ventilation valve is used for being installed on the cab lifting oil tank and comprises a valve body, a valve rod, an upper valve cover and a lower valve cover; a vertically-through valve hole is formed in the valve body, an annular sealing face is arranged on the inner wall of the middle of the valve hole, and ventilation grooves are formed in the inner wall of the valve hole on the two sides of the sealing face. The valve rod penetrates through the valve hole, the two ends of the valve rod correspondingly stretch out of ports of the valve hole, and the middle of the valve rod is sleeved with a sealing ring tightly matched with the sealing face. The upper valve cover and the lower valve cover are each provided with a guide hole, an exhaust hole and an exhaust groove, the guide holes are formed close to the valve body and matched with the extending ends of the corresponding valve rods, the exhaust holes are formed away from the valve body and communicate with the guide holes and the outside, and the exhaust grooves are formed in the inner walls of the guide holes and extend in the axial direction of the guide holes to communicate with the exhaust holes. The periphery of the valve rod between the upper valve cover and the limiting ring on the corresponding side of the valve rod is sleeved with an upper spring, and the periphery of the valve rod between the lower valve cover and the limiting ring on the corresponding side of the valve rod is sleeved with a lower spring.

Description

Technical Field

[0001] The present application relates to the technical field of cabs, and in particular to a two-way vent valve and a cab lifting oil tank. Background Art

[0002] In vehicle engineering, especially in large trucks and some special vehicles, the height difference of the working environment is relatively large. The traditional fixed cab has a small field of view, and the driver's line of sight is easily blocked, resulting in inconvenience for the driver to operate.

[0003] The related technology uses a hydraulic system to drive the cab to lift and lower, realize the lifting function of the cab, and improve the vehicle's performance and the driver's comfort. Among them, the lifting tank, as one of the core components, not only needs to store enough oil, but also needs to have a certain pressure regulation ability to cope with the pressure changes caused by the oil pump during the oil suction and oil return process. Usually, a breathable valve is installed on the top of the lifting tank to adjust the pressure by exhausting or inletting.

[0004] However, in the above technical solution, the air vent valve on the top of the lifting oil tank can only realize a single exhaust or air intake function, which limits the use effect and efficiency of the lifting oil tank to a certain extent. Utility Model Content

[0005] In order to solve at least one of the problems mentioned in the background technology, the embodiment of the present application provides a two-way air valve and a cab lifting oil tank. The two-way air valve can realize corresponding air intake and exhaust functions for the oil suction and oil return processes of the oil pump, and can effectively alleviate the pressure changes inside the lifting oil tank, maintain the stability and reliability of the hydraulic system, and improve the use effect and efficiency of the lifting oil tank.

[0006] In order to achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a two-way air-permeable valve, including a valve body, a valve stem, an upper valve cover and a lower valve cover;

[0007] The valve body is provided with a valve hole which passes through from top to bottom, the inner wall in the middle of the valve hole is provided with an annular sealing surface, the inner walls of the valve hole on both sides of the sealing surface are provided with air-permeable grooves, and the air-permeable grooves extend from the sealing surface to the port of the valve hole on the corresponding side;

[0008] The valve stem is provided with the valve hole, and the two ends of the valve stem correspond to the ports extending out of the valve hole, the middle part of the valve stem is sleeved with a sealing ring that closely matches the sealing surface, and the valve stem is provided with limiting rings for limiting the sealing ring on both sides corresponding to the sealing ring;

[0009] The upper valve cover and the lower valve cover are correspondingly mounted at the upper and lower ends of the valve body. The upper valve cover and the lower valve cover are both provided with a guide hole, an exhaust hole and an exhaust groove. The guide hole is provided close to the valve body and matches with the corresponding extended end of the valve stem. The exhaust hole is provided away from the valve body and connects the guide hole with the outside. The exhaust groove is provided on the inner wall of the guide hole and extends along the axial direction of the guide hole to connect to the exhaust hole.

[0010] An upper spring is sleeved on the periphery of the valve stem between the upper valve cover and the limiting ring on the corresponding side of the valve stem, and a lower spring is sleeved on the periphery of the valve stem between the lower valve cover and the limiting ring on the corresponding side of the valve stem.

[0011] In one feasible embodiment, the upper valve cover and the lower valve cover are both provided with auxiliary exhaust grooves, the diameter of the exhaust hole is smaller than the diameter of the guide hole, the auxiliary exhaust groove is provided on the step surface where the guide hole and the exhaust hole are connected, and the auxiliary exhaust groove extends radially along the guide hole.

[0012] In a feasible implementation, a spring limiting groove is formed at one end of the upper valve cover and the lower valve cover close to the valve body, and the spring limiting groove is communicated with the guide hole.

[0013] In a feasible implementation, 2-4 air-permeable grooves are provided on both sides of the sealing surface, and the air-permeable grooves on both sides of the sealing surface are arranged in one-to-one correspondence and extend along the axial direction of the valve hole.

[0014] In a feasible implementation, the upper valve cover and the lower valve cover are both connected to the valve body via threads, and an isolation limit ring is provided in the middle of the valve body.

[0015] In a feasible implementation, the diameter of the end of the upper valve cover away from the valve body is smaller than the diameter of the end of the upper valve cover close to the valve body, the diameter of the end of the lower valve cover away from the valve body is smaller than the diameter of the end of the lower valve cover close to the valve body, the end of the lower valve cover away from the valve body is provided with an external thread, and a valve sealing ring is embedded in the reducing shoulder of the lower valve cover.

[0016] A second aspect of an embodiment of the present application provides a cab lifting oil tank, including an oil tank body, on which a valve seat is provided, and on which a two-way air vent valve as described above is installed.

[0017] In a feasible embodiment, the oil tank body includes an upper cover assembly and a lower cover assembly which are welded together, the upper cover assembly is provided with a valve seat and a refueling port, a threaded insert for mounting a lower valve cover is provided in the valve seat, the lower cover assembly is provided with an oil pump return port seat, the inner wall of the upper cover assembly is provided with a plurality of oil baffles extending along a vertical plane, and the inner wall of the lower cover assembly is provided with a plurality of wave-breaking plates extending along a vertical plane.

[0018] In a feasible implementation, a welding groove is preset on the connection end surface of the upper cover assembly, and a welding rib is preset on the connection end surface of the lower cover assembly, and the welding groove and the welding rib are connected by vibration friction welding.

[0019] In a feasible implementation, a plurality of the oil baffles are connected in a crisscross manner, a plurality of the wave-breaking plates are independently arranged, and the cross-section of the wave-breaking plates is L-shaped.

[0020] The embodiment of the present application provides a two-way vent valve and a cab lifting oil tank. The sealing ring on the valve stem of the two-way vent valve matches the sealing surface in the middle of the valve hole, vent grooves are provided on both sides of the valve hole, an upper spring is installed between the upper periphery of the valve stem and the upper valve cover, a lower spring is installed between the lower periphery of the valve stem and the lower valve cover, and a guide hole, an exhaust groove and an exhaust hole are provided on both the upper valve cover and the lower valve cover.

[0021] When in use, install the two-way breathable valve on the lifting oil tank so that the valve sealing ring of the lower valve cover is sealed and connected to the valve seat. When the internal pressure of the lifting oil tank is balanced with the external gas pressure, the valve stem is centered, and the sealing ring on the valve stem fits tightly with the sealing surface on the valve hole. When the internal pressure of the lifting oil tank increases and needs to be exhausted, the internal gas pushes the valve stem and the sealing ring away from the sealing surface on the valve hole, and moves to the breathable groove close to the side of the upper valve cover. The internal gas flows upward along the exhaust hole, exhaust groove and guide hole of the lower valve cover, enters the valve hole, flows through the breathable grooves on the lower and upper sides of the sealing surface, enters the upper valve cover, flows through the guide hole, exhaust groove and exhaust hole, and finally completes the exhaust process. When the internal pressure of the lifting oil tank is reduced and air needs to be admitted, the outside air pushes the valve stem and the sealing ring away from the sealing surface on the valve hole and moves to the air-permeable groove near the side of the lower valve cover. The outside air flows downward along the exhaust hole, exhaust groove and guide hole of the upper valve cover, enters the valve hole, flows through the air-permeable grooves on the upper and lower sides of the sealing surface, enters the lower valve cover, flows through the guide hole, exhaust groove and exhaust hole, and finally completes the air intake process. When the two-way air-permeable valve completes the exhaust or intake process and the pressure inside and outside the lifting oil tank is balanced, the valve body returns to the center position under the elastic restoring force of the upper spring and the lower spring, and the sealing ring on the valve stem fits tightly with the sealing surface on the valve hole.

[0022] The two-way air-permeable valve of the present application can realize the corresponding air intake and exhaust functions for the oil pump's oil suction and oil return processes, can effectively alleviate the pressure changes inside the lifting oil tank, maintain the stability and reliability of the hydraulic system, and improve the use effect and efficiency of the lifting oil tank. The present application has the advantages of simple structure, convenient use, easy manufacturing and maintenance, and low use cost, and has broad application prospects in various hydraulic systems for lifting cabs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A three-dimensional diagram of a two-way vent valve provided in an embodiment of the present application;

[0025] Figure 2 An exploded schematic diagram of a two-way vent valve provided in an embodiment of the present application;

[0026] Figure 3 A front view of a two-way vent valve provided in an embodiment of the present application;

[0027] Figure 4 A front view of the upper valve cover provided in an embodiment of the present application;

[0028] Figure 5 A three-dimensional view of an upper valve cover provided in an embodiment of the present application;

[0029] Figure 6 A three-dimensional view of a lower valve cover provided in an embodiment of the present application;

[0030] Figure 7 A front view of a valve body provided in an embodiment of the present application;

[0031] Figure 8 for Figure 7 AA view;

[0032] Fig. 9 A three-dimensional diagram of a valve body provided in an embodiment of the present application;

[0033] Fig.10 A three-dimensional diagram of a valve stem provided in an embodiment of the present application;

[0034] Fig.11 A front view of the two-way vent valve in exhaust state provided in an embodiment of the present application;

[0035] Fig.12A front view of the two-way air-permeable valve in the air intake state provided in an embodiment of the present application;

[0036] Fig.13 A three-dimensional diagram of a cab lifting oil tank provided in an embodiment of the present application;

[0037] Fig.14 An explosion diagram of a cab lifting oil tank provided in an embodiment of the present application;

[0038] Fig.15 A schematic diagram of the use status of the cab lifting oil tank provided in the embodiment of the present application;

[0039] Fig.16 A three-dimensional diagram of the upper cover assembly provided in an embodiment of the present application;

[0040] Fig.17 A three-dimensional diagram of a lower cover assembly provided in an embodiment of the present application;

[0041] Fig.18 A schematic diagram comparing the upper cover assembly and the lower cover assembly before and after welding provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 100-two-way breathable valve;

[0044] 110-valve body; 111-valve hole; 112-sealing surface; 113-venting groove; 114-isolating limit ring;

[0045] 121-upper valve cover; 122-lower valve cover; 123-guide hole; 124-exhaust groove; 125-auxiliary exhaust groove; 126-exhaust hole; 127-spring limit groove;

[0046] 131-upper spring; 132-lower spring;

[0047] 140-valve stem; 141-sealing ring; 142-limiting ring;

[0048] 150-valve sealing ring;

[0049] 200-lifting oil tank;

[0050] 210-upper cover assembly; 211-upper cover body; 212-welding groove; 213-oil baffle plate; 214-valve seat; 215-fuel filler seat; 216-oil cap;

[0051] 220-lower cover assembly; 221-lower cover body; 222-welding ribs; 223-wave-breaking plate; 224-oil inlet and return port seat;

[0052] 230-Oil inlet and return connector. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the embodiment of the present application. It is worth noting that the embodiments described in the drawings are only part of the embodiments of the present application, not all of the embodiments. That is, the embodiments described by the drawings are exemplary and are intended to be used to explain the present application, and cannot be understood as limiting the present application.

[0054] The following will be combined Figure 1-Figure 12 The two-way air permeable valve 100 provided in the embodiment of the present application is described.

[0055] The present application embodiment provides a two-way vent valve 100, such as Figure 1-Figure 3 As shown, it includes a valve body 110 , a valve stem 140 , an upper valve cover 121 and a lower valve cover 122 .

[0056] like Figure 7-Figure 9 As shown, the valve body 110 is provided with a valve hole 111 which passes through from top to bottom, and the inner wall in the middle of the valve hole 111 has an annular sealing surface 112. The inner walls of the valve hole 111 on both sides of the sealing surface 112 are provided with air-permeable grooves 113, which extend from the sealing surface 112 to the ports of the corresponding side valve holes 111.

[0057] like Figure 1-3 Combined with Fig.10 As shown, the valve stem 140 is provided with the valve hole 111, and the two ends of the valve stem 140 correspond to the ports extending out of the valve hole 111. The middle part of the valve stem 140 is sleeved with a sealing ring 141 that is tightly matched with the sealing surface 112. The valve stem 140 is provided with limiting rings 142 on both sides of the sealing ring 141 corresponding to the sealing ring 141 for limiting the sealing ring 141.

[0058] like Figure 1-Figure 6 As shown, the upper valve cover 121 and the lower valve cover 122 are correspondingly installed at the upper and lower ends of the valve body 110. The upper valve cover 121 and the lower valve cover 122 are both provided with a guide hole 123, an exhaust hole 126 and an exhaust groove 124. The guide hole 123 is provided close to the valve body 110 and matches with the corresponding extended end of the valve stem 140. The exhaust hole 126 is provided away from the valve body 110 and connects the guide hole 123 with the outside. The exhaust groove 124 is provided on the inner wall of the guide hole 123 and extends along the axial direction of the guide hole 123 to connect to the exhaust hole 126.

[0059] like Figure 3 As shown, the upper spring 131 is sleeved on the outer periphery of the valve stem 140 between the upper valve cover 121 and the limiting ring 142 on the corresponding side of the valve stem 140 , and the lower spring 132 is sleeved on the outer periphery of the valve stem 140 between the lower valve cover 122 and the limiting ring 142 on the corresponding side of the valve stem 140 .

[0060] Among them, the limiting ring 142 is integrally connected to the valve stem 140, the sealing ring 141 is embedded between the two limiting rings 142, and the sealing ring 141 protrudes from the outer periphery of the limiting ring 142, and the sealing ring 141 on the valve stem 140 is tightly matched with the sealing surface 112 of the inner wall of the valve hole 111. It can be understood that when the valve stem 140 has different pressures on the upper and lower sides of the two-way air-permeable valve 100 and can move up and down relative to the valve hole 111, the sealing ring 141 is separated from the tight fit with the sealing surface 112, and the gas on both sides can flow through the gap between the air-permeable groove 113 and the sealing ring 141, and between the air-permeable groove 113 and the limiting ring 142.

[0061] The exhaust groove 124 is connected to the port of the guide hole 123 on the side close to the valve body 110 and the exhaust hole 126, so that the exhaust or intake gas can flow through the exhaust groove 124 and the exhaust hole 126. Combined with the setting of the air-permeable groove 113, the gas on the upper and lower sides of the valve body 110 can produce a directional flow, thereby realizing the function of intake or exhaust. There is a small gap between the two ends of the valve stem 140 and the guide hole 123 on the corresponding side, and the two slide together to guide the up and down movement of the valve stem 140.

[0062] The upper spring 131 and the lower spring 132 are arranged so that the two-way air-permeable valve 100 can restore the valve stem 140 to a balanced state by means of the restoring force of the spring after the air intake or exhaust process is completed.

[0063] When in use, the two-way air-permeable valve 100 is installed on the lifting oil tank, so that the valve sealing ring 150 of the lower valve cover 122 is sealed and connected with the valve seat on the lifting oil tank. Figure 3 As shown, when the internal pressure of the lifting oil tank is balanced with the external gas pressure, the valve stem 140 is centered, and the sealing ring 141 on the valve stem 140 is tightly fitted with the sealing surface 112 on the valve hole 111. Fig.11 As shown, when the internal pressure of the lifting oil tank increases and needs to be exhausted, the internal gas pushes the valve stem 140 and the sealing ring 141 away from the sealing surface 112 on the valve hole 111, and moves to the air-permeable groove 113 near the side of the upper valve cover 121. The internal gas flows upward along the exhaust hole 126, exhaust groove 124 and guide hole 123 of the lower valve cover 122, enters the valve hole 111, flows through the air-permeable groove 113 on the lower and upper sides of the sealing surface 112, enters the upper valve cover 121, flows through the guide hole 123, exhaust groove 124 and exhaust hole 126, and finally completes the exhaust process. Fig.12As shown, when the internal pressure of the lifting oil tank is reduced and air needs to be taken in, the outside air pushes the valve stem 140 and the sealing ring 141 away from the sealing surface 112 on the valve hole 111, and moves to the air-permeable groove 113 near the side of the lower valve cover 122. The outside air flows downward along the exhaust hole 126, exhaust groove 124 and guide hole 123 of the upper valve cover 121, enters the valve hole 111, flows through the air-permeable groove 113 on the upper and lower sides of the sealing surface 112, enters the lower valve cover 122, flows through the guide hole 123, exhaust groove 124 and exhaust hole 126, and finally completes the air intake process. When the two-way air-permeable valve 100 completes the exhaust or air intake process, and the pressure inside and outside the lifting oil tank is balanced, the valve body 110 returns to the center position under the elastic restoring force of the upper spring 131 and the lower spring 132, and the sealing ring 141 on the valve stem 140 fits tightly with the sealing surface 112 on the valve hole 111.

[0064] The two-way air-permeable valve 100 of the present application can realize the corresponding air intake and exhaust functions for the oil pump's oil suction and oil return processes, can effectively alleviate the pressure changes inside the lifting oil tank, maintain the stability and reliability of the hydraulic system, and improve the use effect and efficiency of the lifting oil tank. The present application has the advantages of simple structure, convenient use, easy manufacturing and maintenance, and low use cost, and has a wide range of application prospects in various hydraulic systems for lifting cabs.

[0065] In one possible implementation, Figure 4-Figure 6 As shown, the upper valve cover 121 and the lower valve cover 122 are both provided with an auxiliary exhaust groove 125, the diameter of the exhaust hole 126 is smaller than the diameter of the guide hole 123, the auxiliary exhaust groove 125 is provided on the step surface where the guide hole 123 and the exhaust hole 126 are connected, and the auxiliary exhaust groove 125 extends along the radial direction of the guide hole 123.

[0066] With this arrangement, the auxiliary exhaust groove 125 can cooperate with the exhaust groove 124 to assist exhaust, thereby improving the flexibility of the valve stem 140 and improving the sensitivity of the two-way air valve 100 .

[0067] In one possible implementation, Figure 3 As shown, a spring limiting groove 127 is formed at one end of the upper valve cover 121 and the lower valve cover 122 close to the valve body 110 , and the spring limiting groove 127 is communicated with the guide hole 123 .

[0068] With this arrangement, the spring limiting groove 127 can define the installation position of the spring, so that the spring has the effects of reliable fixation and stable acting force.

[0069] In one possible implementation, Figure 7-Figure 9 As shown, 2-4 air-permeable grooves 113 are provided on both sides of the sealing surface 112 . The air-permeable grooves 113 on both sides of the sealing surface 112 are arranged in a one-to-one correspondence and extend along the axial direction of the valve hole 111 .

[0070] With this arrangement, the multiple ventilation grooves 113 can increase the ventilation volume, improve the exhaust and intake speeds, and more quickly achieve pressure balance inside and outside the lifting oil tank.

[0071] In one possible implementation, Figure 1-Figure 3 As shown, the upper valve cover 121 and the lower valve cover 122 are both connected to the valve body 110 through threads, and the middle part of the valve body 110 is provided with an isolation limit ring 114.

[0072] This arrangement not only facilitates the disassembly and assembly of the upper valve cover 121 , the lower valve cover 122 and the valve body 110 , but also the isolation limit ring 114 separates the upper valve cover 121 and the lower valve cover 122 to prevent the two from slipping or interfering with each other.

[0073] In one possible implementation, Figure 1-Figure 6 As shown, the outer diameter of the end of the upper valve cover 121 away from the valve body 110 is smaller than the outer diameter of the end of the upper valve cover 121 close to the valve body 110, the outer diameter of the end of the lower valve cover 122 away from the valve body 110 is smaller than the outer diameter of the end of the lower valve cover 122 close to the valve body 110, the end of the lower valve cover 122 away from the valve body 110 is provided with an external thread, and the valve sealing ring 150 is embedded in the reducing shoulder of the lower valve cover 122.

[0074] The outer diameter of the end of the upper valve cover 121 away from the valve body 110 can be provided with a convex ring for clamping a vent pipe connected to the atmosphere to facilitate exhaust. The lower valve cover 122 can be connected to the internal thread of the internal thread insert of the valve seat through an external thread.

[0075] This arrangement facilitates the installation and placement of the upper valve cover 121 and the lower valve cover 122, and the valve sealing ring 150 at the lower valve cover 122 is installed on the valve seat 214 to improve the sealing between the two-way air valve 100 and the lifting oil tank.

[0076] The following will be combined Figure 13-Figure 18 The cab lifting oil tank 200 provided in the embodiment of the present application is described.

[0077] The embodiment of the present application provides a cab lifting oil tank 200, such as Fig.13 and Fig.14 As shown, it includes an oil tank body, on which a valve seat 214 is disposed, and on which the above-mentioned two-way air-permeable valve 100 is installed.

[0078] In this way, the two-way air valve 100 is installed on the valve seat 214, and exhaust or air can be discharged through the two-way air valve 100 to adjust the pressure balance inside and outside the lifting oil tank 200, which can effectively alleviate the pressure changes inside the lifting oil tank 200, maintain the stability and reliability of the hydraulic system, and improve the use effect and efficiency of the lifting oil tank 200.

[0079] In one possible implementation, Figure 13-Figure 17 As shown, the oil tank body includes an upper cover assembly 210 and a lower cover assembly 220 connected by welding. The upper cover assembly 210 is provided with a valve seat 214 and a refueling port, a threaded insert for fitting the lower valve cover 122 is provided in the valve seat 214, an oil pump return port seat is provided in the lower cover assembly 220, a plurality of oil baffles 213 extending along a vertical plane are provided on the inner wall of the upper cover assembly 210, and a plurality of wave-breaking plates 223 extending along a vertical plane are provided on the inner wall of the lower cover assembly 220.

[0080] Among them, the upper cover assembly 210 includes an upper cover body 211, a valve seat 214 and a refueling port. The upper cover body 211 is open at the bottom, and the valve seat 214 is integrally injection-molded on the top surface of the upper cover body 211 and is connected to the interior of the upper cover body 211. A threaded insert is arranged in the valve seat 214, and the threaded insert is provided with an internal thread matching the external thread of the lower valve cover 122. The two-way air vent valve 100 is threadedly matched and tightly installed in the valve seat 214 through the valve sealing ring 150. The refueling port includes a refueling port seat 215 and an oil cap 216, which are used to replenish oil into the oil tank body. The refueling port seat 215 is integrally injection-molded on the side of the upper cover body 211 to facilitate oil filling, and the oil cap 216 is threadedly connected to the refueling port seat 215. The oil baffle 213 is integrally connected to the inner wall of the upper cover body 211.

[0081] The lower cover assembly 220 includes a lower cover body 221 and an oil inlet and return port seat 224. The lower cover body 221 is open at the top, and the oil inlet and return port seat 224 is integrally injection-molded on the bottom surface of the lower cover body 221, and is used to connect the oil inlet and return port joint 230, and then connect the oil inlet and return pipes. The wave-breaking plate 223 is integrally connected to the inner wall of the lower cover body 221.

[0082] When returning the oil, the oil is injected into the lifting oil tank 200 through the oil return joint 230. Under the action of the oil pump, an oil column will be generated and splashed on the inner wall surface of the upper cover body 211. The setting of the oil baffle 213 can have a certain blocking and drainage effect on the oil column, which can reduce the oil column from splashing in all directions to produce more oil, gas and foam.

[0083] When the vehicle is driving, due to the long length of the lifting oil tank 200, the oil in the oil tank body shakes greatly, which is easy to produce foam and oil gas. The setting of the wave-breaking plate 223 can have a certain blocking effect on the oil shaking, thereby reducing the foam and oil gas derived from the shaking.

[0084] By providing the oil baffle plate 213 and the wave-breaking plate 223 , splashing and fluctuation of the oil in the oil tank body can be effectively prevented, thereby improving the safety and stability of the lifting oil tank 200 .

[0085] In one possible implementation, Fig.18As shown, a welding groove 212 is preset on the connection end surface of the upper cover assembly 210, and a welding rib 222 is preset on the connection end surface of the lower cover assembly 220. The welding groove 212 and the welding rib 222 are connected by vibration friction welding.

[0086] The bottom open edge of the upper cover body 211 matches the top open edge of the lower cover body 221. Before welding, the top of the welding rib 222 on the lower cover body 221 can be inserted into the welding groove 212 on the upper cover body 211, and there is a gap between the two side surfaces of the welding rib 222 and the groove wall of the welding groove 212. During the welding process, the welding rib 222 will be fully melted, and the welding groove 212 will block the overflow and welding slag generated by the melting of the welding rib 222. Of course, the contact position between the welding groove 212 and the welding rib 222 will also be melted to a certain extent. The two are welded together by vibration friction welding, which improves the sealing and structural strength of the lifting oil tank 200.

[0087] In one possible implementation, Fig.16 and Fig.17 As shown, a plurality of oil baffles 213 are connected in a crisscross manner, a plurality of wave-breaking plates 223 are independently arranged, and the cross section of the wave-breaking plate 223 is L-shaped.

[0088] In this way, the oil baffle 213 can block and drain the oil column at different angles and orientations. The wave-breaking plate 223 can have a draining effect on the oil, but will not affect the liquid level of the oil.

[0089] It should be noted that, unless otherwise clearly specified and limited, in the description of this application, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0090] The orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0091] The term "plurality" means two or more than two, unless expressly specified otherwise.

[0092] The terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can include sequential implementations other than those illustrated or described herein.

[0093] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A two-way vent valve, characterized in that: It includes a valve body, a valve stem, an upper valve cover and a lower valve cover; The valve body is provided with a valve hole which passes through from top to bottom, the inner wall in the middle of the valve hole is provided with an annular sealing surface, the inner walls of the valve hole on both sides of the sealing surface are provided with air-permeable grooves, and the air-permeable grooves extend from the sealing surface to the port of the valve hole on the corresponding side; The valve stem is provided with the valve hole, and the two ends of the valve stem correspond to the ports extending out of the valve hole, the middle part of the valve stem is sleeved with a sealing ring that closely matches the sealing surface, and the valve stem is provided with limiting rings for limiting the sealing ring on both sides corresponding to the sealing ring; The upper valve cover and the lower valve cover are correspondingly mounted at the upper and lower ends of the valve body. The upper valve cover and the lower valve cover are both provided with a guide hole, an exhaust hole and an exhaust groove. The guide hole is provided close to the valve body and matches with the corresponding extended end of the valve stem. The exhaust hole is provided away from the valve body and connects the guide hole with the outside. The exhaust groove is provided on the inner wall of the guide hole and extends along the axial direction of the guide hole to connect to the exhaust hole. An upper spring is sleeved on the periphery of the valve stem between the upper valve cover and the limiting ring on the corresponding side of the valve stem, and a lower spring is sleeved on the periphery of the valve stem between the lower valve cover and the limiting ring on the corresponding side of the valve stem.

2. The two-way air-permeable valve according to claim 1, characterized in that: The upper valve cover and the lower valve cover are both provided with auxiliary exhaust grooves, the diameter of the exhaust hole is smaller than the diameter of the guide hole, the auxiliary exhaust groove is provided on the step surface where the guide hole and the exhaust hole are connected, and the auxiliary exhaust groove extends along the radial direction of the guide hole.

3. The two-way vent valve according to claim 2, characterized in that: The upper valve cover and the lower valve cover are both provided with a spring limiting groove at one end close to the valve body, and the spring limiting groove is communicated with the guide hole.

4. The two-way air-permeable valve according to claim 1, characterized in that: Two to four air-permeable grooves are provided on both sides of the sealing surface. The air-permeable grooves on both sides of the sealing surface are arranged one by one and extend along the axial direction of the valve hole.

5. The two-way vent valve according to claim 4, characterized in that: The upper valve cover and the lower valve cover are both connected to the valve body via threads, and an isolation limiting ring is provided in the middle of the valve body.

6. The two-way air-permeable valve according to any one of claims 1 to 5, characterized in that: The diameter of the end of the upper valve cover away from the valve body is smaller than the diameter of the end of the upper valve cover close to the valve body, the diameter of the end of the lower valve cover away from the valve body is smaller than the diameter of the end of the lower valve cover close to the valve body, the end of the lower valve cover away from the valve body is provided with an external thread, and a valve sealing ring is embedded in the reducing shoulder of the lower valve cover.

7. A cab lifting oil tank, characterized in that: It comprises an oil tank body, on which a valve seat is arranged, and on which the two-way air-permeable valve as claimed in any one of claims 1 to 6 is installed.

8. The cab lifting oil tank according to claim 7, characterized in that: The oil tank body includes an upper cover assembly and a lower cover assembly which are welded together. The upper cover assembly is provided with a valve seat and a refueling port. A threaded insert for mounting a lower valve cover is provided in the valve seat. The lower cover assembly is provided with an oil pump return port seat. The inner wall of the upper cover assembly is provided with a plurality of oil baffles extending along a vertical plane. The inner wall of the lower cover assembly is provided with a plurality of wave-breaking plates extending along a vertical plane.

9. The cab lifting oil tank according to claim 8, characterized in that: A welding groove is preset on the connection end surface of the upper cover assembly, and a welding rib is preset on the connection end surface of the lower cover assembly. The welding groove and the welding rib are connected by vibration friction welding.

10. The cab lifting oil tank according to claim 9, characterized in that: A plurality of the oil baffles are connected in a crisscross manner, a plurality of the wave-breaking plates are independently arranged, and the cross-section of the wave-breaking plates is L-shaped.

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