CN217676587U

CN217676587U - Exhaust assembly and hydraulic jack

Info

Publication number: CN217676587U
Application number: CN202122944675.XU
Authority: CN
Inventors: 于孝达
Original assignee: Shenzhen Yangning Auto Parts Co ltd
Current assignee: Shenzhen Yangning Auto Parts Co ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-10-28
Anticipated expiration: 2031-11-26

Abstract

The application discloses exhaust subassembly and hydraulic jack, hydraulic jack includes upper seat, piston pipe, oil circuit valve and bobbin, the oil circuit valve sets up in the bobbin, divide the bobbin into oil storage area and hydraulic pressure district, the oil storage area is the area that is close to in the bobbin the upper seat, the hydraulic pressure district is the area of keeping away from in the bobbin the upper seat, the switch-on of oil storage area and hydraulic pressure district is controlled to the oil circuit valve; the piston pipe guides hydraulic oil into the hydraulic area through the oil path valve, so that the oil path valve slides in the cylinder; the exhaust assembly is arranged in the upper seat and controls the gas in the oil storage area to be exhausted. This application is through setting up the exhaust subassembly in hydraulic jack, can in time with the gas discharge in the oil storage area, avoids the atmospheric pressure grow in the oil storage area, leads to the not good problem that appears the potential safety hazard even of result of use.

Description

Exhaust assembly and hydraulic jack

Technical Field

The application relates to the field of mechanical equipment, in particular to an exhaust assembly and a hydraulic jack.

Background

The hydraulic jack usually realizes the function of the jack by mutually converting hydraulic oil in two internal areas and driving a piston to do reciprocating motion. Hydraulic jacks are portable because of their small size and are often used to lift the body of a car, allowing people to replace tires or to repair cars.

However, when the hydraulic jack is required to lift an object by a long distance, the gas pressure accumulated in the hydraulic jack is increased along with the increase of the reciprocating times of the piston, so that the use effect of the hydraulic jack is easily influenced, and a safety hazard is also generated in a serious case.

SUMMERY OF THE UTILITY MODEL

The utility model provides an exhaust subassembly and hydraulic jack solves hydraulic jack in the use because the result of use that inside atmospheric pressure grow appears is not good even the problem of potential safety hazard appears.

The application discloses an exhaust assembly for a hydraulic jack, wherein the hydraulic jack comprises an upper seat, a piston pipe, an oil way valve and a pipe barrel, one end of the piston pipe is connected with the upper seat, and the other end of the piston pipe is connected with the oil way valve; the oil circuit valve is arranged in the pipe barrel and divides the pipe barrel into an oil storage area and a hydraulic area, the oil storage area is an area close to the upper seat in the pipe barrel, the hydraulic area is an area far away from the upper seat in the pipe barrel, and the oil circuit valve controls the conduction of the oil storage area and the hydraulic area; the piston pipe guides hydraulic oil inside the hydraulic jack into the hydraulic area through the oil way valve, so that the oil way valve slides in the pipe barrel; the exhaust assembly is arranged in the upper seat and controls the gas in the oil storage area to be exhausted.

Optionally, the exhaust assembly includes a valve core and an exhaust switch, a through hole is provided in the upper seat, the valve core is disposed in the through hole, and the exhaust switch is disposed on a side of the valve core away from the oil circuit valve and abuts against the valve core; when the exhaust switch is pressed, the exhaust switch extrudes the valve core to open the valve core, and gas in the oil storage area is discharged out of the hydraulic jack through the valve core.

Optionally, the through hole includes a threaded hole and a pillar hole, the threaded hole is disposed between the pillar hole and the oil storage area, and the valve core is fixed in the threaded hole; the hydraulic jack also comprises a packaging cover, the packaging cover is fixed on one side of the upper seat far away from the pipe barrel, and a connecting column corresponding to the column hole is arranged on the packaging cover; one end of the exhaust switch protrudes out of the packaging cover, and the other end of the exhaust switch penetrates through the connecting column and is movably connected with the connecting column; when the exhaust switch is pressed, the exhaust switch moves in the connecting column, abuts against the valve core and presses the valve core, so that the valve core is opened.

Optionally, the connecting column includes a first circular side wall, a second circular side wall and a bottom wall, the diameter of the first circular side wall is greater than the diameter of the second circular side wall, the bottoms of the first circular side wall and the second circular side wall are flush, and the bottom of the first circular side wall and the bottom of the second circular side wall are connected through the bottom wall; the exhaust switch comprises a switch cap, a switch column, a buckling piece and a first spring, wherein the diameter of the switch column is smaller than that of the second circular side wall, and the switch column is inserted into the second circular side wall; the switch cap is connected with one end of the switch column, and the diameter of the switch cap is larger than that of the second circular side wall; the first spring is sleeved on the switch post, the diameter of the first spring is larger than that of the second circular side wall and smaller than that of the switch cap, one end of the first spring is abutted against the switch cap, and the other end of the first spring is abutted against the bottom wall of the connecting post; the buckling piece is located at one end, far away from the switch cap, of the fixing column and fixedly connected with the switch column, and the cross-sectional area of the buckling piece is larger than that of the second circular side wall.

Optionally, the height of the first circular sidewall is greater than the height of the second circular sidewall, and the difference between the height of the first circular sidewall and the height of the second circular sidewall is smaller than the height of the switch cap.

Optionally, the switch cap is a cylinder with an opening at the bottom, and one end of the switch cylinder is inserted into the opening of the switch cap and is fixedly connected with the switch cap; one end of the first spring is inserted into the opening of the switch cap and is abutted against the switch cap; the diameter of the side wall of the switch cap is larger than the diameter of the second circular side wall.

Optionally, an annular groove is formed in one end, away from the switch cap, of the switch column, a U-shaped opening matched with the annular groove is formed in the buckling piece, and the buckling piece is fixedly connected with the switch column.

The application also discloses a hydraulic jack, which comprises an oil unloading assembly and the exhaust assembly, wherein the oil unloading assembly controls the opening and closing of an oil unloading hole in the oil path valve and controls the conduction of the hydraulic area and the oil storage area; the oil discharge assembly controls the oil discharge hole to be communicated and controls the exhaust switch to open the valve core.

Optionally, the oil unloading assembly includes a first oil unloading rod, a second oil unloading rod, an oil unloading switch, an oil unloading valve and a second spring, the oil unloading switch is disposed on a side of the upper seat away from the tube barrel, the first oil unloading rod corresponds to the oil unloading switch, a diameter of the second oil unloading rod is smaller than a diameter of the first oil unloading rod, one end of the second oil unloading rod is connected with the first oil unloading rod, and the other end of the second oil unloading rod is inserted into the oil unloading hole; the second spring is sleeved on the second oil unloading hole, one end of the second spring is abutted with the first oil unloading rod, and the other end of the second spring is abutted with the oil way valve; the oil discharge valve is inserted into the oil discharge hole from one side of the oil path valve, which is far away from the upper seat, is connected with the second oil discharge rod, and seals the oil discharge hole; when the oil unloading switch is pressed, the first oil unloading rod, the second oil unloading rod and the oil unloading valve move towards the direction far away from the upper seat, the second spring is compressed, and the oil unloading valve is exposed out of the oil unloading hole, so that the oil storage area is communicated with the hydraulic area; and the oil discharge switch is also pressed to the exhaust switch, so that the valve core is opened.

Optionally, the oil discharge switch includes a knob and a plug pin, and the plug pin penetrates through a first end of the knob and is inserted into the upper seat to fix the knob on the upper seat; the second end of the knob is overlapped with the first oil unloading rod and the exhaust switch, and the second end of the knob is sequentially contacted with the first oil unloading rod and the exhaust switch in the pressing process, so that the oil unloading hole is sequentially opened, and the valve core is opened.

Generally, when the piston pipe moves back and forth in the pipe barrel for multiple times, more and more gas enters the oil storage area, so that the gas pressure is increased, part of the gas enters the oil storage area at the moment, hydraulic oil in the hydraulic area is squeezed into the oil storage area, the movement of the piston rod is influenced, and the normal work of the hydraulic jack is influenced; but may also lead to oil leakage and even other risks of use. This application can in time be with the gas outgoing in the oil storage area through set up the exhaust subassembly in hydraulic jack, avoids the atmospheric pressure grow in the oil storage area, leads to the problem that the not good potential safety hazard appears even of result of use.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

FIG. 1 is an external schematic view of a hydraulic jack according to an embodiment of the present disclosure;

FIG. 2 is an internal exploded view of a hydraulic jack according to an embodiment of the present disclosure;

FIG. 3 is a schematic cross-sectional view of an exhaust assembly provided in accordance with an embodiment of the present application;

FIG. 4 is a schematic view of an upper housing provided in accordance with an embodiment of the present application;

FIG. 5 is a schematic view of a package cover according to an embodiment of the present application;

FIG. 6 is a schematic view of an exhaust switch provided in accordance with an embodiment of the present application;

FIG. 7 is a schematic view of an assembled exhaust switch and packaging cover according to an embodiment of the present application;

FIG. 8 is a schematic view of an oil discharge assembly according to an embodiment of the present application.

Wherein, 100, hydraulic jack; 110. an upper seat; 111. a through hole; 112. a threaded hole; 113. a post hole; 120. a piston tube; 121. a hydraulic rod; 130. an oil circuit valve; 131. an oil discharge hole; 140. a pipe barrel; 150. a housing; 160. a base; 170. a top plate; 180. a top plate fixture; 190. a handle; 200. an exhaust assembly; 210. a valve core; 220. an exhaust switch; 221. a switch cap; 222. a switch post; 223. a fastener; 224. a first spring; 225. an annular groove; 226. a U-shaped opening; 300. a package cover; 310. connecting columns; 311. a first circular sidewall; 312. a second circular sidewall; 313. a bottom wall; 400. an oil discharge assembly; 410. a first oil discharge rod; 420. a second oil-discharging rod; 430. an oil discharge switch; 431. a knob; 432. a bolt; 440. an oil drain valve; 450. a second spring.

Detailed Description

The present application is described in detail below with reference to the figures and alternative embodiments.

Referring to fig. 1 and 2, the present application discloses a hydraulic jack 100, the hydraulic jack 100 includes a housing 150, an upper seat 110, a tube 140, a base 160, a handle 190, a piston tube 120, a hydraulic rod 121, an oil way valve 130 and a top plate 170, the top plate 170 is fixed on the housing 150 through a top plate fixing member 180, the housing 150 is sleeved outside the tube 140, the tube 140 is sleeved outside the piston tube 120, the piston tube 120 is sleeved outside the hydraulic rod 121, the upper seat 110 and the base 160 are respectively located at two ends of the housing 150, the upper seat 110 is fixedly connected with the housing 150, the base 160 is fixedly connected with the tube 140, one end of the piston tube 120 is fixedly connected with the upper seat 110, the other end is fixedly connected with the oil way valve 130, and the handle 190 is in transmission connection with the hydraulic rod 121.

The oil path valve 130 is disposed in the tube 140, and divides the tube 140 into an oil storage region and a hydraulic region, the oil storage region is a region of the tube 140 close to the upper seat 110, the hydraulic region is a region of the tube 140 far from the upper seat 110, and the oil path valve 130 controls the conduction of the oil storage region and the hydraulic region; the oil storage area is filled with hydraulic oil, and the piston tube 120 guides the hydraulic oil into the hydraulic area through the oil path valve 130, so that the oil path valve 130 slides in the tube 140. Specifically, the handle 190 controls the hydraulic rod 121 to move up and down in the piston tube 120, so that the hydraulic oil in the oil storage area enters the hydraulic area, the housing 150 and the top plate 170 are driven to move up, and since the top plate 170 abuts against the bottom of the weight, the top plate 170 moves up to lift up the weight.

Generally, when the piston tube 120 makes a plurality of reciprocating movements in the tube 140, so that more and more gas enters the oil storage area, and the gas pressure increases, part of the gas enters the hydraulic pressure area, so as to squeeze hydraulic oil in the hydraulic pressure area into the oil storage area, thereby affecting the movement of the piston rod and the normal operation of the hydraulic jack 100; but may also lead to oil leakage and even other risks of use. As shown in FIG. 3, this application is through set up exhaust assembly 200 in hydraulic jack 100, exhaust assembly 200 sets up in the upper seat 110, the control is discharged gas in the oil storage area to can be in time with the gaseous discharge in the oil storage area, avoid the atmospheric pressure grow in the oil storage area, lead to the problem that the result of use is not good or the potential safety hazard appears even.

3-5, the exhaust assembly 200 includes a valve core 210 and an exhaust switch 220, the upper seat 110 has a through hole 111 therein, the valve core 210 is disposed in the through hole 111, and the exhaust switch 220 is disposed on a side of the valve core 210 away from the oil path valve 130 and abuts against the valve core 210; when the exhaust switch 220 is pressed, the exhaust switch 220 presses the valve core 210, so that the valve core 210 is opened, and the gas in the oil storage area is exhausted out of the hydraulic jack 100 through the valve core 210. The valve core 210 has the dual functions of air leakage prevention and air exhaust, and the valve core 210 is applied to the hydraulic jack 100, so that hydraulic oil and air in an oil storage area can be prevented from leaking out to cause oil leakage and influence on the normal use of the hydraulic jack 100 under a common condition; when the exhaust is needed, the valve core 210 is pressed through the exhaust switch 220, and the hydraulic oil is prevented from leaking out while exhausting, so that the using effect is well met.

Specifically, the through hole 111 includes a threaded hole 112 and a column hole 113, the threaded hole 112 is disposed between the column hole 113 and the oil storage area, the valve core 210 is fixed in the threaded hole 112, and is fixed with the threaded hole 112 in a threaded manner, so that hydraulic oil and air are prevented from leaking out from between the valve core 210 and the side wall of the threaded hole 112. The hydraulic jack 100 further comprises a packaging cover 300, the packaging cover 300 is fixed on one side of the upper seat 110 far away from the tube 140, and a connecting column 310 corresponding to the column hole 113 is arranged on the packaging cover 300; one end of the air release switch 220 protrudes out of the package cover 300, and the other end thereof penetrates through the connection column 310 and is movably connected with the connection column 310; when the exhaust switch 220 is pressed, the exhaust switch 220 moves in the connecting post 310, abuts against the valve core 210, and presses the valve core 210, so that the valve core 210 is opened. The additional sealing cover 300 can cover the through hole 111 of the upper seat 110 and the valve core 210, thereby providing an aesthetic effect and protecting the exhaust assembly 200. Of course, it is also possible to directly connect the exhaust switch 220 to the pillar hole 113 without providing the sealing cover 300.

As shown in fig. 5 to 7, further, the connecting column 310 is hollow, specifically, the connecting column 310 includes a first circular side wall 311, a second circular side wall 312 and a bottom wall 313, the diameter of the first circular side wall 311 is greater than the diameter of the second circular side wall 312, the bottoms of the first circular side wall 311 and the second circular side wall 312 are flush, and the bottom of the first circular side wall 311 and the bottom of the second circular side wall 312 are connected through the bottom wall 313, that is, the cross section of the column hole 113 can be regarded as a U-shaped structure. The exhaust switch 220 comprises a switch cap 221, a switch post 222, a snap 223 and a first spring 224, wherein the diameter of the switch post 222 is smaller than that of the second circular side wall 312, and is inserted into the second circular side wall 312; the switch cap 221 is connected to one end of the switch post 222, and the diameter of the switch cap 221 is greater than that of the second circular sidewall 312; the first spring 224 is sleeved on the switch post 222, the diameter of the first spring 224 is larger than that of the second circular side wall 312 and smaller than that of the switch cap 221, one end of the first spring 224 abuts against the switch cap 221, and the other end abuts against the bottom wall 313 of the connecting post 310; the fastener 223 is located at an end of the fixing post away from the switch cap 221, and is fixedly connected to the switch post 222, and the cross-sectional area of the fastener 223 is greater than that of the second circular sidewall 312.

Although the valve core 210 is provided with a spring inside itself, after the valve core 210 is pressed, the valve core 210 can restore itself, but in order to avoid the damage of the valve core 210 caused by the excessive external force, the first spring 224 is additionally arranged in the exhaust switch 220, so that the valve core 210 can be protected, and the restoration effect of the exhaust assembly 200 can be increased. Moreover, the switch cap 221, the switch post 222 and the first spring 224 are firmly fixed to the packing cover 300 by the snap 223, preventing the problem of falling off of parts during assembly and disassembly, thereby facilitating the assembly. In addition, the switch cap 221, the switch post 222, the fastener 223, the first spring 224 and the package cover 300 are tightly attached, which is beneficial to reducing the volume of the whole exhaust assembly 200 and realizing the miniaturization of the structure. In addition, even if the hydraulic jack 100 is filled with water and the water falls into the connecting column 310 due to the design of the connecting column 310, the water is accumulated between the first circular sidewall 311 and the second circular sidewall 312 due to the shielding of the switch cap 221 and the shape of the connecting column 310, and does not enter the through hole 111 of the upper seat 110, thereby not affecting the normal exhaust of the valve core 210.

An annular groove 225 is formed in one end, away from the switch cap 221, of the switch column 222, a U-shaped opening 226 matched with the annular groove 225 is formed in the buckling piece 223, and the buckling piece 223 is fixedly connected with the switch column 222. The fastener 223 is similar to a U-shaped sheet structure, and two ends of the fastener 223 are retracted inwards to prevent falling off after fixation; in addition, the bottom and two ends of the fastener 223 are slightly convex inwards, so that the attaching area of the fastener 223 and the switch column 222 is reduced, and the fastener 223 is easily inserted into the annular groove 225 when being subjected to a large acting force and cannot cause the fastener 223 to crack.

Moreover, the height of the first circular side wall 311 is greater than that of the second circular side wall 312, and the difference between the height of the first circular side wall 311 and the height of the second circular side wall 312 is smaller than that of the switch cap 221, so that the moving distance of the switch cap 221 is larger, and the exhaust of the valve core 210 can be better controlled. In addition, the switch cap 221 is a cylinder with an opening at the bottom, and one end of the switch column 222 is inserted into the opening of the switch cap 221 and is fixedly connected with the switch cap 221; one end of the first spring 224 is inserted into the opening of the switch cap 221, and abuts against the switch cap 221; the diameter of the sidewall of the switch cap 221 is larger than the diameter of the second circular sidewall 312. After the switch cap 221 is pressed to the bottom, the switch cap 221 can be attached to the bottom wall 313 of the connection column 310, and the moving distance of the switch cap 221 is further increased.

The switch cap 221 and the switch post 222 are integrally formed, and the first spring 224 is attached to a sidewall of the switch cap 221. After being installed between the switch cap 221 and the switch post 222, the first spring 224 can be clamped between the switch cap and the switch post, so that the first spring is not easy to fall off and is convenient to install.

In addition, as shown in fig. 2 and 8, the hydraulic jack 100 further includes an oil discharge assembly 400, wherein the oil discharge assembly 400 controls the opening and closing of the oil discharge hole 131 in the oil circuit valve 130, and controls the communication between the hydraulic area and the oil storage area; the oil discharge assembly 400 controls the oil discharge hole 131 to be turned on and controls the exhaust switch 220 to open the valve core 210. Thus, the hydraulic jack 100 can realize oil discharge and exhaust simultaneously through one operation, and the action efficiency of the hydraulic jack 100 is greatly improved; and the problems of abnormal use and potential safety hazard caused by forgetting to exhaust in the use process are avoided.

Specifically, the oil discharging assembly 400 includes a first oil discharging rod 410, a second oil discharging rod 420, an oil discharging switch 430, an oil discharging valve 440 and a second spring 450, the oil discharging switch 430 is disposed on one side of the upper base 110 away from the barrel 140, the first oil discharging rod 410 corresponds to the oil discharging switch 430, the diameter of the second oil discharging rod 420 is smaller than that of the first oil discharging rod 410, one end of the second oil discharging rod 420 is connected with the first oil discharging rod 410, and the other end is inserted into the oil discharging hole 131; the second spring 450 is sleeved on the second oil discharge hole 131, one end of the second spring abuts against the first oil discharge rod 410, and the other end of the second spring abuts against the oil circuit valve 130; the oil discharge valve 440 is inserted into the oil discharge hole 131 from the side of the oil path valve 130 away from the upper seat 110, is connected to the second oil discharge rod 420, and seals the oil discharge hole 131; when the oil discharge switch 430 is pressed, the first oil discharge rod 410, the second oil discharge rod 420 and the oil discharge valve 440 move in a direction away from the upper seat 110, the second spring 450 is compressed, and the oil discharge valve 440 exposes the oil discharge hole 131, so that the oil storage area and the hydraulic area are conducted; and the oil drain switch 430 is also pressed to the exhaust switch 220 so that the valve core 210 is opened.

In the embodiment, the oil discharge hole 131 of the oil path valve 130 is used for conducting a hydraulic area and an oil storage area in the tube 140, the first oil discharge rod 410, the second oil discharge rod 420, the oil discharge switch 430, the oil discharge valve 440 and the second spring 450 are matched to realize conduction and sealing of the oil discharge hole 131, and the oil discharge switch 430 is arranged in the upper seat 110, after the hydraulic jack 100 is used, a user can transmit kinetic energy to the first oil discharge rod 410, the second oil discharge rod 420 and the oil discharge valve 440 by simply controlling the oil discharge switch 430, so that the oil discharge hole 131 is conducted, the oil discharge process is simple to operate, and after the oil discharge hole 131 is conducted, hydraulic oil can quickly fall back to the oil storage area from the hydraulic area under the action of pressure, so that the hydraulic jack 100 can quickly reset to quickly store or unfold a next wheel for use.

The oil discharge switch 430 comprises a knob 431 and a bolt 432, wherein the bolt 432 penetrates through a first end of the knob 431 and is inserted into the upper seat 110 to fix the knob 431 on the upper seat 110; the second end of the knob 431 is overlapped with the first oil discharging rod 410 and the air exhaust switch 220, and the second end of the knob 431 is sequentially contacted with the first oil discharging rod 410 and the air exhaust switch 220 in the pressing process, so that the oil discharging hole 131 is sequentially opened, and the valve core 210 is opened.

When not using, can pull out bolt 432 and dismantle knob 431, can avoid oil discharge switch 430 to expose because great area and appear damaging the risk in the external world easily, can avoid again that the accident leads to knob 431 to press for a long time and make exhaust assembly 200 and oil discharge assembly 400 be in the opening device always, influence life. When the oil drain assembly is used, the effect of opening the exhaust assembly 200 and the oil drain assembly 400 simultaneously can be achieved by simply pressing one end of the knob 431 by utilizing the lever principle, so that time and labor are saved.

The foregoing is a further detailed description of the present application in connection with specific alternative embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be considered as belonging to the protection scope of the present application.

Claims

1. An exhaust assembly for a hydraulic jack, wherein the hydraulic jack comprises an upper seat, a piston tube, an oil way valve and a tube barrel, one end of the piston tube is connected with the upper seat, and the other end of the piston tube is connected with the oil way valve; the oil circuit valve is arranged in the pipe barrel and divides the pipe barrel into an oil storage area and a hydraulic area, the oil storage area is an area close to the upper seat in the pipe barrel, the hydraulic area is an area far away from the upper seat in the pipe barrel, and the oil circuit valve controls the conduction of the oil storage area and the hydraulic area;

the piston pipe guides hydraulic oil inside the hydraulic jack into the hydraulic area through the oil circuit valve, so that the oil circuit valve slides in the pipe barrel; the exhaust assembly is arranged in the upper seat and controls the exhaust of gas in the oil storage area.

2. The exhaust assembly according to claim 1, wherein the exhaust assembly includes a valve core and an exhaust switch, a through hole is provided in the upper seat, the valve core is disposed in the through hole, and the exhaust switch is disposed on a side of the valve core away from the oil passage valve and abuts against the valve core;

when the exhaust switch is pressed, the exhaust switch extrudes the valve inside to open the valve inside, and gas in the oil storage area is discharged out of the hydraulic jack through the valve inside.

3. The exhaust assembly as recited in claim 2 wherein said through bore includes a threaded bore and a post bore, said threaded bore being disposed between said post bore and said oil reservoir, said valve core being secured in said threaded bore;

the hydraulic jack also comprises a packaging cover, the packaging cover is fixed on one side of the upper seat far away from the pipe barrel, and a connecting column corresponding to the column hole is arranged on the packaging cover; one end of the exhaust switch protrudes out of the packaging cover, and the other end of the exhaust switch penetrates through the connecting column and is movably connected with the connecting column;

when the exhaust switch is pressed, the exhaust switch moves in the connecting column, abuts against the valve core and presses the valve core, so that the valve core is opened.

4. The exhaust assembly according to claim 3 wherein the connecting stud comprises a first circular sidewall, a second circular sidewall, and a bottom wall, the first circular sidewall having a diameter greater than the second circular sidewall, the first circular sidewall and the second circular sidewall having bottoms that are flush, and the first circular sidewall and the second circular sidewall having a bottom connected by the bottom wall;

the exhaust switch comprises a switch cap, a switch column, a buckling piece and a first spring, wherein the diameter of the switch column is smaller than that of the second circular side wall, and the switch column is inserted into the second circular side wall; the switch cap is connected with one end of the switch column, and the diameter of the switch cap is larger than that of the second circular side wall; the first spring is sleeved on the switch post, the diameter of the first spring is larger than that of the second circular side wall and smaller than that of the switch cap, one end of the first spring is abutted against the switch cap, and the other end of the first spring is abutted against the bottom wall of the connecting post; the buckling piece is located at one end, far away from the switch cap, of the switch column and fixedly connected with the switch column, and the cross-sectional area of the buckling piece is larger than that of the second circular side wall.

5. The exhaust assembly according to claim 4, wherein a height of the first circular sidewall is greater than a height of the second circular sidewall, and a difference between the height of the first circular sidewall and the height of the second circular sidewall is less than a height of the switch cap.

6. The exhaust assembly according to claim 5, wherein the switch cap is a cylinder with an open bottom, and one end of the switch cylinder is inserted into the opening of the switch cap and fixedly connected with the switch cap; one end of the first spring is inserted into the opening of the switch cap and is abutted against the switch cap; the diameter of the side wall of the switch cap is larger than the diameter of the second circular side wall.

7. The vent assembly of claim 4, wherein an annular groove is formed in an end of the switch post remote from the switch cap, and a U-shaped opening is formed in the fastener to engage the annular groove, the fastener being fixedly connected to the switch post.

8. A hydraulic jack, wherein the hydraulic jack comprises an oil unloading assembly and an air exhausting assembly according to any one of claims 1 to 7, the oil unloading assembly controls the opening and closing of an oil unloading hole in the oil path valve and controls the conduction of the hydraulic area and the oil storage area; the oil discharge assembly controls the oil discharge hole to be communicated and controls the exhaust switch to open the valve inside.

9. The hydraulic jack of claim 8, wherein the oil discharging assembly comprises a first oil discharging rod, a second oil discharging rod, an oil discharging switch, an oil discharging valve and a second spring, the oil discharging switch is arranged on one side of the upper seat away from the pipe barrel, the first oil discharging rod corresponds to the oil discharging switch, the diameter of the second oil discharging rod is smaller than that of the first oil discharging rod, one end of the second oil discharging rod is connected with the first oil discharging rod, and the other end of the second oil discharging rod is inserted into the oil discharging hole; the second spring is sleeved on the second oil unloading rod, one end of the second spring is abutted with the first oil unloading rod, and the other end of the second spring is abutted with the oil way valve; the oil discharge valve is inserted into the oil discharge hole from one side of the oil path valve, which is far away from the upper seat, is connected with the second oil discharge rod, and seals the oil discharge hole;

when the oil discharge switch is pressed, the first oil discharge rod, the second oil discharge rod and the oil discharge valve move towards the direction far away from the upper seat, the second spring compresses, and the oil discharge valve exposes out of the oil discharge hole, so that the oil storage area is communicated with the hydraulic area; and the oil discharge switch is also pressed to the exhaust switch, so that the valve core is opened.

10. The hydraulic jack of claim 9, wherein said oil drain switch includes a knob and a plug that extends through a first end of said knob and into said upper housing to secure said knob to said upper housing; the second end of the knob is overlapped with the first oil unloading rod and the exhaust switch, and the second end of the knob is sequentially contacted with the first oil unloading rod and the exhaust switch in the pressing process, so that the oil unloading hole is sequentially opened, and the valve core is opened.