CN201351097Y - Oil return structure of hydraulic jack - Google Patents
Oil return structure of hydraulic jack Download PDFInfo
- Publication number
- CN201351097Y CN201351097Y CNU2009200364939U CN200920036493U CN201351097Y CN 201351097 Y CN201351097 Y CN 201351097Y CN U2009200364939 U CNU2009200364939 U CN U2009200364939U CN 200920036493 U CN200920036493 U CN 200920036493U CN 201351097 Y CN201351097 Y CN 201351097Y
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- oil return
- pump chamber
- oil
- return valve
- valve body
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Abstract
Disclosed is an oil return structure of a hydraulic jack, belonging to a safe oil return device which is added on the hydraulic jack and has speed adjusting function. The hydraulic jack comprises a base, an outer casing and an oil cylinder respectively fixed on the base, a pump body, an oil storage cavity formed between the outer casing and the oil cylinder, a piston rod arranged in the cavity of the oil cylinder and equipped with a piston subassembly at the bottom part, a hood respectively matched and connected with the outer casing and the top part of the oil cylinder and used for supporting the piston rod, and a pump core arranged in the pump body. The oil return structure is characterized in that an oil return valve is additionally arranged on the base of the hydraulic jack; and the oil return valve comprises an oil return valve body, an oil return valve rod, a first spring, a steel ball, a second spring, a gasket, a third spring and a throttle valve body. The oil return structure has the advantages that the oil passage is simple in structure; the component parts are easy to process and assemble and convenient to maintain; and the oil return structure can ensure quick descending under idle load and slow descending under load.
Description
Technical field
The utility model relates to a kind of oil return structure of hydraulic jack, be installed on the base of hydraulic jack, when load descends, realize descending at a slow speed, belong to the safe oil return device of setting up on hydraulic jack with speed-regulating function by the flow of modulated pressure medium.
Background technology
Hydraulic jack oil return structure on the market mainly comprises release valve rod and the steel ball in the pump chamber that is located on the jack stand now, when the hydraulic jack release, unclamp steel ball by rotating the release valve rod, hydraulic medium is entered the pump chamber through the oil circuit on the base from the cylinder chamber of oil cylinder, and the oil circuit of another on base is got back in the shoe cream room of overcoat again.This oil return structure, the descending speed of energy held stationary when zero load descends, but when load descends,, cause the flow velocity of hydraulic medium to strengthen because the interior pressure in oil cylinder cylinder chamber increases, it is too fast that institute's top load thing is descended, and operator and loaded article are caused potential safety hazard.China utility model patent Granted publication CN2721943Y, " a kind of hydraulic unit that has the hydraulic slow release device " disclosed, it is that the valve rod of draining the oil is designed to front end and drain oil sealing, there is big gap the rear end, act on successively by sealed end and rear end, form bypass and carry out draining, the valve rod jack when rotating that guarantees to drain the oil descends at a slow speed, and rotates the effect that reaches quick decline more than 2 circles again.This technical scheme is unloaded identical with principle under the load condition effect, all be to descend at a slow speed when beginning to discharge, its inefficiency, and this technical scheme still exists complex structure, processing difficulties, and the defective of trouble when manipulating, and exist the sealed end sealing member to damage and the potential safety hazard of the inefficacy that causes descending at a slow speed.
Summary of the invention
At the deficiency that exists in the prior art, the purpose of this utility model is to provide a kind of oil channel structures simple, that be convenient to process and assemble and oil return structure that can guarantee the hydraulic jack of the new type of safe that unloaded decline fast and load descend at a slow speed.
The purpose of this utility model reaches like this, a kind of oil return structure of hydraulic jack, described hydraulic jack comprises base, be separately fixed at overcoat and the oil cylinder and the pump housing on the base, be formed at the shoe cream room between overcoat and the oil cylinder, be arranged in the cylinder chamber of oil cylinder and piston rod that piston component is housed in the bottom, that connect with overcoat and oil cylinder top respectively and be used to help the top cap of piston rod, be arranged at the pump core in the pump housing, be characterized in: on the base of described hydraulic jack, also have additional a fuel-return valve, this fuel-return valve comprises the oil return valve body, the oil return valve rod, first spring, steel ball, second spring, packing ring, the 3rd spring, and throttle valve body, described oil return valve body is fixed in the 3rd pump chamber on the base, centre at the oil return valve body offers first pump chamber successively, the stepped bore and second pump chamber, wherein stepped bore be positioned at the centre of first pump chamber and second pump chamber and respectively with first pump chamber, second pump chamber communicates, one end of described oil return valve rod places second pump chamber of oil return valve body, it is external that the other end of oil return valve rod extends to fuel-return valve, described first spring is arranged in second pump chamber of oil return valve body and is set on the oil return valve rod, described throttle valve body places first pump chamber of oil return valve body, centre at throttle valve body is formed with valve pocket, cutoff port, cutoff port is positioned at the front end end of valve pocket and communicates with valve pocket, described steel ball, second spring, packing ring and the 3rd spring place stepped bore respectively, wherein an end of the 3rd spring contacts with throttle valve body, the other end of the 3rd spring contacts with packing ring, one end of second spring contacts with packing ring, the other end of second spring contacts with steel ball, and steel ball is corresponding with an end end of described oil return valve rod; On described oil return valve body, also offer first oil circuit and second oil circuit respectively, wherein: an end of first oil circuit communicates with first pump chamber, the other end of first oil circuit communicates with the 3rd pump chamber on the base, the 3rd pump chamber communicates with the cylinder chamber by the 3rd oil circuit that is opened on the base, one end of second oil circuit communicates with second pump chamber, the other end of second oil circuit communicates with the 4th pump chamber on being opened in base, and the 4th pump chamber communicates with shoe cream room by the 4th oil circuit that is opened on the base.
The utility model is provided with first back-up ring in described first pump chamber, first back-up ring is positioned at the leading section of throttle valve body, is used for fixing described throttle valve body.
The utility model is provided with the fuel screen that is used for filtered fluid piezodielectric impurity in described first pump chamber, fuel screen is positioned at the leading section of first back-up ring.
The utility model also is provided with second back-up ring in described first pump chamber, second back-up ring is positioned at the leading section of fuel screen, is used for fixing described fuel screen.
The described oil return valve rod of the utility model is provided with seal ring, makes by seal ring to constitute between the chamber wall of second pump chamber of oil return valve rod and described oil return valve body to be sealed and matched.
The utility model is because after adopting said structure, and one of advantage that has, oil channel structures are simple; Advantage two, be easy to the processing and the assembling of parts, easy to maintenance; Advantage three, can guarantee to descend fast when unloaded, descend at a slow speed during load, can improve safety of operators and descend at a slow speed during load, reduce buffering to loaded article, the time that jack resets can be reduced in unloading back decline fast, increases work efficiency.
Description of drawings
Fig. 1 is applied to an embodiment reference diagram on the hydraulic horizontal jack for the utility model.
Fig. 2 is the axonometric drawing of the spatial structure of fuel-return valve described in the utility model.
Fig. 3 is the cutaway view of the planar structure of fuel-return valve described in the utility model.
Fig. 4 is an A portion enlarged drawing among Fig. 1.
Wherein: 1. piston rod, 2. top cap, 3. overcoat, 4. shoe cream room, 5. piston component, 6. cylinder chamber, 7. the pump housing, 8. pump core, 9. oil return valve rod, 10. first spring, 11. steel ball, 12. oil return valve body, 13. second spring, 14. packing ring, 15. the 3rd spring, 16. throttle valve body, 17. first back-up ring, 18. fuel screen, 19. second back-up ring, 20. base, 21. oil cylinder, 22. cutoff port, 23. valve pocket, 24. first oil circuit, 25. first pump chamber, 26. step surface, 27. stepped bore, 28. second oil circuit, 29. second pump chamber, 30. the 3rd pump chamber, 31. the 3rd oil circuit, 32. the 4th oil circuit, 33. the 4th pump chamber, 34. seal ring.
The specific embodiment
By the description of applicant, will help to understand the utility model more, and good effect of the present utility model is embodied more, but embodiment should not be considered as the restriction to some extent to technical solutions of the utility model embodiment.
See also Fig. 1 and in conjunction with Fig. 2, Fig. 3 and Fig. 4, in the present embodiment, the hydraulic horizontal jack structure that is disclosed belongs to known prior art, therefore only do simple the description here, it mainly comprises base 20, overcoat 3, oil cylinder 21, top cap 2, piston rod 1, piston component 5, the pump housing 7 and the pump housing 8, the bottom of oil cylinder 21 and base 20 are spirally connected, the top of oil cylinder 21 and top cap 2 are spirally connected, overcoat 3 is set in outside the oil cylinder 21, the bottom of overcoat 3 and base 20 are spirally connected, the top of overcoat 3 and top cap 2 constitute and are tightly connected, between overcoat 3 and oil cylinder 21, be formed with shoe cream room 4, piston rod 1 places the cylinder chamber 6 of oil cylinder 21, the bottom of piston rod 1 is installed with piston component 5, and structure extends to outside the oil cylinder 21 behind the centre hole of the top of piston rod 1 in the middle of passing top cap 2 for being sealed and matched between the cylinder chamber 6 chamber walls of piston component 5 and oil cylinder 21, the pump housing 7 is screwed onto on the base 20, is provided with to be used to order about the pump core 8 that piston rod 1 carries out piston motion in the pump housing 7.Have additional a fuel-return valve on the base 20 of present original hydraulic horizontal jack, this fuel-return valve comprises oil return valve body 12, oil return valve rod 9, first spring 10, steel ball 11, second spring 13, packing ring 14, the 3rd spring 15, throttle valve body 16, first back-up ring 17, fuel screen 18 and second back-up ring 19.Described oil return valve body 12 is fixed in the 3rd pump chamber 30 on the base 20, offer first pump chamber 25, stepped bore 27 and second pump chamber 29 from left to right successively in the centre of oil return valve body 12, wherein stepped bore 27 is positioned at the centre of first pump chamber 25 and second pump chamber 29 and communicates with first pump chamber 25, second pump chamber 29 respectively.One end of described oil return valve rod 9 places second pump chamber 29 of oil return valve body 12, the other end of oil return valve rod 9 extends to outside the oil return valve body 12, simultaneously in order to guarantee being sealed and matched between oil return valve rod 9 and second pump chamber, the 29 chamber walls, on the outer wall of described oil return valve rod 9, offer groove, in groove, be embedded seal ring 34.Described first spring 10 is arranged in second pump chamber 29 of oil return valve body 12 and is set on the oil return valve rod 9, is used for the self-return of oil return valve rod 9.Described throttle valve body 16 places first pump chamber 25 of oil return valve body 12, be formed with valve pocket 23, cutoff port 22 in the centre of throttle valve body 16, cutoff port 22 is positioned at the front end end of valve pocket 23 and communicates with valve pocket 23, and wherein the aperture of cutoff port 22 will be much smaller than the valve pocket diameter of valve pocket 23.Described steel ball 11, second spring 13, packing ring 14 and the 3rd spring 15 place stepped bore 27 respectively, wherein an end of the 3rd spring 15 contacts with throttle valve body 16, the other end of the 3rd spring 15 contacts with packing ring 14, one end of second spring 13 contacts with packing ring 14, the other end of second spring 13 contacts with steel ball 11, and steel ball 11 is corresponding with an end end of described oil return valve rod 9.Described first back-up ring 17, fuel screen 18 and second back-up ring 19 are separately positioned in first pump chamber 25 of oil return valve body 12, wherein first back-up ring 17 is positioned at the leading section of throttle valve body 16, and be opened in first pump chamber, 25 chamber walls on groove build-in mutually, be used for fixing described throttle valve body 16; Fuel screen 18 is positioned at the leading section of first back-up ring 17, is used for the impurity of filtered fluid piezodielectric, prevents that oil circuit from blocking; And second back-up ring 19 is positioned at the leading section of fuel screen 18, and be opened in first pump chamber, 25 chamber walls on groove build-in mutually, be used for fixing described fuel screen 18.On described oil return valve body 12, also offer first oil circuit 24 and second oil circuit 28 respectively, wherein: an end of first oil circuit 24 communicates with first pump chamber 25, the other end of first oil circuit 24 communicates with the 3rd pump chamber 30 on the base 20, the 3rd pump chamber 30 communicates with cylinder chamber 6 by the 3rd oil circuit 31 that is opened on the base 20, one end of second oil circuit 28 communicates with second pump chamber 29, the other end of second oil circuit 28 communicates with the 4th pump chamber 33 on being opened in base 20, and the 4th pump chamber 33 communicates with shoe cream room 4 by the 4th oil circuit 32 that is opened on the base 20.
Please continue to consult Fig. 1, Fig. 2, Fig. 3 and Fig. 4, narrate principle of work of the present utility model: when jack load is replied, promote oil return valve rod 9 and back down steel ball 11, owing to exist difference of pressure between the valve pocket 23 of the 3rd pump chamber 30 and throttle valve body 16, pressure in the 3rd pump chamber 30 is greater than the pressure in the valve pocket 23, promote to form between the step surface 26 on the interior stepped bore 27 of spring force that throttle valve body 16 overcomes the 3rd spring 15 and oil return valve body 12 and be sealed and matched, thereby make three oil circuit 31 of hydraulic medium from base 20 in the cylinder chamber 6 successively through getting back to the shoe cream room 4 behind 27 → the second pump chambers of the cutoff port 22 → valve pocket 23 → stepped bore on the 3rd pump chamber 30 → throttle valve body 16,29 → the second oil circuits 28 → the 4th pump chamber 33 → the 4th oil circuit 32.In above-mentioned load Recovery Process, because load pressure can only flow out, reduced the flow of hydraulic medium in unit time from the cutoff port 22 of throttle valve body 16, reduce the answer speed of jack, thereby reach the effect that descends at a slow speed.When shedding load, difference of pressure between the 3rd pump chamber 30 and the valve pocket 23 can't overcome the spring force effect of the 3rd spring 15, make throttle valve body 16 can't and oil return valve body 12 in stepped bore 27 on step surface 26 between form and be sealed and matched, in this case, the cutoff port 22 of hydraulic medium on the throttle valve body 16, but the 3rd oil circuit 31 from base 20 is realized unloaded decline fast successively through getting back to the shoe cream room 4 behind first oil circuit, 24 → the first pump chambers, 25 → stepped bore, 27 → the second pump chambers, 29 → the second oil circuits 28 → the 4th pump chamber 33 → the 4th oil circuit 32 on the 3rd pump chamber 30 → oil return valve body 12.
Claims (5)
1, a kind of oil return structure of hydraulic jack, described hydraulic jack comprises base (20), be separately fixed at overcoat (3) and the oil cylinder (21) and the pump housing (7) on the base (20), be formed at the shoe cream room (4) between overcoat (3) and the oil cylinder (21), be arranged in the cylinder chamber (6) of oil cylinder (21) and piston rod (1) that piston component (5) are housed in the bottom, connect and the top cap (2) that be used to help piston rod (1) with overcoat (3) and oil cylinder (21) top respectively, be arranged at the pump core (8) in the pump housing (7), it is characterized in that also having additional a fuel-return valve on the base (20) at described hydraulic jack, this fuel-return valve comprises oil return valve body (12), oil return valve rod (9), first spring (10), steel ball (11), second spring (13), packing ring (14), the 3rd spring (15), and throttle valve body (16), described oil return valve body (12) is fixed in the 3rd pump chamber (30) on the base (20), offer first pump chamber (25) successively in the centre of oil return valve body (12), stepped bore (27) and second pump chamber (29), wherein stepped bore (27) be positioned at the centre of first pump chamber (25) and second pump chamber (29) and respectively with first pump chamber (25), second pump chamber (29) communicates, one end of described oil return valve rod (9) places second pump chamber (29) of oil return valve body (12), the other end of oil return valve rod (9) extends to outside the oil return valve body (12), described first spring (10) is arranged in second pump chamber (29) of oil return valve body (12) and is set on the oil return valve rod (9), described throttle valve body (16) places first pump chamber (25) of oil return valve body (12), be formed with valve pocket (23) in the centre of throttle valve body (16), cutoff port (22), cutoff port (22) is positioned at the front end end of valve pocket (23) and communicates with valve pocket (23), described steel ball (11), second spring (13), packing ring (14) and the 3rd spring (15) place stepped bore (27) respectively, wherein an end of the 3rd spring (15) contacts with throttle valve body (16), the other end of the 3rd spring (15) contacts with packing ring (14), one end of second spring (13) contacts with packing ring (14), the other end of second spring (13) contacts with steel ball (11), and steel ball (11) is corresponding with an end end of described oil return valve rod (9); On described oil return valve body (12), also offer first oil circuit (24) and second oil circuit (28) respectively, wherein: an end of first oil circuit (24) communicates with first pump chamber (25), the other end of first oil circuit (24) communicates with the 3rd pump chamber (30) on the base (20), the 3rd pump chamber (30) communicates with cylinder chamber (6) by the 3rd oil circuit (31) that is opened on the base (20), one end of second oil circuit (28) communicates with second pump chamber (29), the other end of second oil circuit (28) communicates with the 4th pump chamber (33) on being opened in base (20), and the 4th pump chamber (33) communicates with shoe cream room (4) by the 4th oil circuit (32) that is opened on the base (20).
2, the oil return structure of hydraulic jack according to claim 1, it is characterized in that in described first pump chamber (25), being provided with first back-up ring (17), first back-up ring (17) is positioned at the leading section of throttle valve body (16), is used for fixing described throttle valve body (16).
3, the oil return structure of hydraulic jack according to claim 1 and 2 is characterized in that being provided with the fuel screen (18) that is used for filtered fluid piezodielectric impurity in described first pump chamber (25), and fuel screen (18) is positioned at the leading section of first back-up ring (17).
4, according to the oil return structure of claim 1 or 3 described hydraulic jacks, it is characterized in that in described first pump chamber (25), also being provided with second back-up ring (19), second back-up ring (19) is positioned at the leading section of fuel screen (18), is used for fixing described fuel screen (18).
5, the oil return structure of hydraulic jack according to claim 1, it is characterized in that described oil return valve rod (9) is provided with seal ring (34), make by seal ring (34) to constitute between the chamber wall of second pump chamber (29) of oil return valve rod (9) and described oil return valve body (12) to be sealed and matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200364939U CN201351097Y (en) | 2009-02-18 | 2009-02-18 | Oil return structure of hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200364939U CN201351097Y (en) | 2009-02-18 | 2009-02-18 | Oil return structure of hydraulic jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201351097Y true CN201351097Y (en) | 2009-11-25 |
Family
ID=41374483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200364939U Expired - Lifetime CN201351097Y (en) | 2009-02-18 | 2009-02-18 | Oil return structure of hydraulic jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201351097Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102718170A (en) * | 2012-06-01 | 2012-10-10 | 常熟通润汽车零部件股份有限公司 | Self-return oil drain valve of hydraulic jack |
| CN102826480A (en) * | 2012-08-20 | 2012-12-19 | 常熟通润汽车零部件股份有限公司 | Structurally-improved oil-return device of hydraulic jack |
-
2009
- 2009-02-18 CN CNU2009200364939U patent/CN201351097Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102718170A (en) * | 2012-06-01 | 2012-10-10 | 常熟通润汽车零部件股份有限公司 | Self-return oil drain valve of hydraulic jack |
| CN102718170B (en) * | 2012-06-01 | 2014-04-02 | 常熟通润汽车零部件股份有限公司 | Self-return oil drain valve of hydraulic jack |
| CN102826480A (en) * | 2012-08-20 | 2012-12-19 | 常熟通润汽车零部件股份有限公司 | Structurally-improved oil-return device of hydraulic jack |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20091125 Effective date of abandoning: 20090218 |