CN220434715U - Hollow rod Relay type load-shedding deep drawing device - Google Patents
Hollow rod Relay type load-shedding deep drawing device Download PDFInfo
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- CN220434715U CN220434715U CN202320083308.1U CN202320083308U CN220434715U CN 220434715 U CN220434715 U CN 220434715U CN 202320083308 U CN202320083308 U CN 202320083308U CN 220434715 U CN220434715 U CN 220434715U
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- load
- pump
- hollow
- reducing
- hydraulic feedback
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- 238000004891 communication Methods 0.000 claims abstract description 54
- 238000005086 pumping Methods 0.000 claims abstract description 43
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 27
- 238000007789 sealing Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 76
- 230000001603 reducing effect Effects 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 239000003129 oil well Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Abstract
A hollow rod relay load-shedding deep pumping device is characterized in that a hollow hydraulic feedback pump is integrated with the lower part of a hollow sucker rod load-shedding pumping device, a fixed part of the hollow hydraulic feedback pump is integrated with a load-shedding lower pump cylinder, a reciprocating part of the hollow hydraulic feedback pump is integrated with an internal communication joint, a central hole is communicated with an internal channel of an inner pipe, when the reciprocating part of the hollow hydraulic feedback pump and a load-shedding lower plunger synchronously reciprocate, well fluid enters the hollow hydraulic feedback pump from an oil inlet, well fluid is discharged from an oil outlet after being pressurized by the hollow hydraulic feedback pump and flows out of an outflow communication groove, the load-shedding lower pump cylinder and the hollow hydraulic feedback pump are placed in an outer pipe, an outer joint is connected to the upper part of the outer pipe, an annular channel is formed between the outer pipe and the load-shedding lower pump cylinder and the hollow hydraulic feedback pump, the upper part of the annular channel is communicated with the lateral communication hole, and the lower part of the annular channel is communicated with an inlet of the hydraulic feedback pump.
Description
Technical Field
The utility model relates to an oil pumping device for an oil field, in particular to a hollow rod relay load relief deep pumping device.
Background
The reciprocating sucker rod pumping unit for oil field includes pumping unit, sucker rod, oil pump and oil pipe, the pumping unit being installed on ground, the sucker rod, the oil pump and the oil pipe are arranged in a shaft of the oil well, and the oil pump drives the oil pump to reciprocate through the sucker rod to pump the crude oil in the well to the ground. If the reciprocating sucker rod pump is adopted for pumping oil in deep wells and ultra-deep wells (deep pumping and ultra-deep means pumping oil under kilometers or even under thousands of meters), the sucker rod and the oil pipe have large load, the stroke loss generated by the elastic expansion of the oil pumping rod and the oil pipe is large, the gap between the plunger and the pump barrel of the oil pump is large, the service life of the oil pipe, the oil pumping rod and the oil pump is short, and the pump efficiency and the system efficiency are low.
To solve the above problems, the skilled person has developed means to reduce the load on the sucker rod. It is installed on the oil pipe and sucker rod between the wellhead and the oil pump, to reduce the load of the upper sucker rod and the pumping unit. For example, in the chinese patent 201220295713.1, "sucker rod load-reducing device", the device can only reduce the load of the sucker rod above the device, but cannot reduce the pressure of the liquid column of the oil pump installed below the device and the problems caused by the pressure of the liquid column, and the well liquid pumped by the device occupies the central passage, and cannot be used for heavy oil recovery in cooperation with the hollow sucker rod to drop into the equipment or drive in the liquid into the central passage.
Therefore, the technical staff developed the hollow sucker rod load-reducing pumping unit, the unit was installed on the oil pipe and sucker rod between the wellhead and the oil pump, the unit can generate upward thrust at the installation position of the pipe column, reduce the load of the sucker rod and the pumping unit, increase the depth of the pumping unit or increase the discharge capacity, the inside of the unit can also pass through the cable, the cable can be lowered below the unit, the viscosity-reducing fluid can be pumped below the unit, the viscosity of the thickened oil can be reduced, the fluidity of the crude oil can be improved, and the blockage of the pumping channel can be prevented. However, this technique does not achieve relief of the pressure of the fluid column of the pump installed under the device.
For this purpose, the technicians have developed a segmented pumping device with a rod pump, which is mounted on the tubing and sucker rod between the wellhead and the pump. The device overcomes the problems of the hollow sucker rod load-shedding sucker device: 1. the upward thrust can be generated at the installation position of the pipe column, and the load of the sucker rod on the device is lightened; 2. the hydraulic column pressure of the oil pump arranged below the device and the problems (relay oil pumping) caused by the hydraulic column pressure can be relieved; 3. can be matched with a hollow sucker rod to put into equipment or to drive in liquid to carry out thickened oil exploitation. But the load reducing mechanism on the device is provided with a communication hole, so that the upper end face of the lower plunger is communicated with the sleeve, and the pressure difference exists between the upper end face and the lower end face of the lower plunger, thereby achieving the purpose of generating upward thrust at the installation position of the pipe column. Therefore, it is necessary to provide the relief mechanism with a communication hole. However, three problems are generated after the connecting hole is formed, and the first problem is that when the working fluid level of the oil well is high, the pressure difference between the upper end face and the lower end face of the lower plunger is reduced, so that the load reducing effect is affected; the second problem is that when the sleeve is used for mixing thin oil, reducing viscosity and pumping thick oil, the sleeve is filled with thin oil, the pressure difference between the upper end face and the lower end face of the lower plunger is zero, and no load reducing effect is achieved; the third problem is that the gap between the upper pump cylinder and the upper plunger, and the gap between the lower pump cylinder and the lower plunger leak fluid into the sleeve, and this part of fluid will be lost, reducing the oil well yield.
Disclosure of Invention
The utility model aims to design a hollow rod relay load-reducing deep drawing device, which overcomes the problems, reduces the liquid column pressure and the liquid column load borne by rods, pipes and pumps, can be matched with a hollow sucker rod to put equipment into a central channel or drive liquid into the central channel for thick oil exploitation, and eliminates the influence of sleeve pressure on the load-reducing effect.
The purpose of the utility model is realized in the following way: comprises a hollow sucker rod load-shedding pumping device and a hollow hydraulic feedback pump.
Wherein, the hollow sucker rod load-reducing oil pumping device comprises an upper hollow rod joint, a load-reducing upper pump cylinder, a load-reducing upper plunger, an outer communicating joint, an inner pipe, a load-reducing lower plunger, a load-reducing lower pump cylinder and an inner communicating joint, the pump diameter of the load-reducing upper pump cylinder is smaller than that of the load-reducing lower pump cylinder, the load-reducing upper plunger is arranged in the load-reducing upper pump cylinder, the load-reducing upper plunger is matched and sealed with the load-reducing upper pump cylinder, the upper hollow rod joint, the load-reducing upper plunger, the load-reducing lower plunger and the inner communicating joint are sequentially connected, the upper hollow rod joint is provided with an outflow communicating groove, the inner communicating joint is provided with an inflow communicating groove, the load-reducing upper pump cylinder, the outer communicating joint and the load-reducing lower pump cylinder are sequentially connected, the load-reducing lower plunger is arranged in the load-reducing lower pump cylinder, the load-reducing plunger is matched and sealed with the load-reducing pump cylinder, the outer communication joint is provided with a lateral communication hole, the lateral communication hole is communicated with the lower end of the load-reducing upper pump cylinder and the upper end of the load-reducing lower pump cylinder, an inner pipe is arranged between the hollow rod joint and the inner communication joint, a liquid outlet channel is formed between the inner pipe and the load-reducing lower plunger and between the inner pipe and the load-reducing upper plunger, the upper end of the inner pipe and the hollow rod joint are kept sealed, a sealing part between the upper end of the inner pipe and the hollow rod joint is positioned above the outflow communication groove, the lower end of the inner pipe and the inner communication joint are kept sealed, and a sealing part between the lower end of the inner pipe and the inner communication joint is positioned below the inflow communication groove, so that well liquid flowing into the liquid outlet channel from the inflow communication groove can only flow out of the outflow communication groove.
The hollow hydraulic feedback pump consists of two pump cylinders with different pump diameters, two plungers matched with the pump cylinders, an oil inlet valve, an oil outlet valve and a connecting piece, wherein the upper part of the hollow hydraulic feedback pump is provided with an oil outlet, the lower part of the hollow hydraulic feedback pump is provided with an oil inlet, and the inside of the hollow hydraulic feedback pump is provided with a central hole.
The hollow hydraulic feedback pump is integrated with the lower part of the hollow sucker rod load-shedding pumping device, the fixed part of the hollow hydraulic feedback pump is integrated with the load-shedding pump cylinder, the reciprocating part of the hollow hydraulic feedback pump is integrated with the internal communication joint, the central hole is communicated with the internal channel of the inner pipe, when the reciprocating part of the hollow hydraulic feedback pump and the load-shedding plunger synchronously reciprocate, well fluid enters the hollow hydraulic feedback pump from the oil inlet, is discharged from the oil outlet after being pressurized by the hollow hydraulic feedback pump, and flows out of the outflow communication groove.
The hydraulic feedback device comprises a hydraulic feedback pump, a lateral communication hole, an outer pipe, a load-reducing pump cylinder, a hollow hydraulic feedback pump, a lateral communication joint and an annular channel.
The beneficial effects of the utility model are as follows: the utility model is arranged on an oil pipe and a sucker rod between a wellhead and an oil pump, realizes subsection relay load shedding and oil pumping, and has the following beneficial effects.
1. The utility model reduces the liquid column pressure and the liquid column load borne by the rod, the pipe and the pump which are arranged under the utility model, can increase the liquid amount discharged by the oil pump and prolongs the service life of the lower rod, the pipe and the pump.
2. The hollow sucker rod load-reducing sucker device is provided with an outer tube, so that the load-reducing effect is not affected by the pressure of the sleeve, the utility model can generate larger upward thrust at the installation position, and lighten the load of the sucker rod above the utility model.
3. Can be matched with a hollow sucker rod to put into equipment or to drive in liquid to carry out thickened oil exploitation.
Drawings
Fig. 1 is an assembly view of an embodiment of the present utility model.
Description of the embodiments
An embodiment of the present utility model will be described with reference to fig. 1.
As shown in fig. 1, the embodiment of the utility model comprises a hollow sucker rod relief pumping device, a hollow hydraulic feedback pump 9 and an outer tube 10.
Wherein, the hollow sucker rod load-reducing oil pumping device comprises an upper hollow rod joint 1, a load-reducing upper pump cylinder 2, a load-reducing upper plunger 3, an outer communication joint 4, an inner pipe 5, a load-reducing lower plunger 6, a load-reducing lower pump cylinder 7 and an inner communication joint 8, the pump diameter of the load-reducing upper pump cylinder 2 is smaller than that of the load-reducing lower pump cylinder 7, the load-reducing upper plunger 3 is arranged in the load-reducing upper pump cylinder 2, the load-shedding upper plunger 3 is sealed with the load-shedding upper pump barrel 2 in a matched manner, the upper hollow rod joint 1, the load-shedding upper plunger 3, the load-shedding lower plunger 6 and the inner communication joint 8 are sequentially connected, the upper hollow rod joint 1 is provided with an outflow communication groove 1-1, the inner communication joint 8 is provided with an inflow communication groove 8-1, the load-shedding upper pump barrel 2, the outer communication joint 4 and the load-shedding lower pump barrel 7 are sequentially connected, the load-shedding lower plunger 6 is arranged in the load-shedding lower pump barrel 7, the unloading lower plunger 6 and the unloading lower pump cylinder 7 are sealed in a matched manner, the outer communication joint 4 is provided with a lateral communication hole 4-1, the lateral communication hole 4-1 is communicated with the lower end of the unloading upper pump cylinder 2 and the upper end of the unloading lower pump cylinder 7, an inner pipe 5 is arranged between the hollow rod joint 1 and the inner communication joint 8, a liquid outlet channel 5-1 is formed between the inner pipe 5 and the unloading lower plunger 6 as well as between the unloading upper plunger 3, the upper end of the inner pipe 5 and the hollow rod joint 1 are kept sealed, the sealing part between the upper end of the inner pipe 5 and the hollow rod joint 1 is positioned above the liquid outlet communication groove 1-1, the sealing part between the lower end of the inner pipe 5 and the inner communication joint 8 is kept sealed, the sealing part between the lower end of the inner pipe 5 and the inner communication joint 8 is positioned below the liquid inlet communication groove 8-1, so that the well fluid flowing into the outlet channel 5-1 from the inflow communication groove 8-1 can only flow out from the outflow communication groove 1-1.
The hollow hydraulic feedback pump 9 consists of two pump cylinders with different pump diameters, two plungers matched with the pump cylinders, an oil inlet valve, an oil outlet valve and a connecting piece, wherein the upper part of the hollow hydraulic feedback pump 9 is provided with an oil outlet 9-1, the lower part of the hollow hydraulic feedback pump is provided with an oil inlet 9-3, and the inside of the hollow hydraulic feedback pump is provided with a central hole 9-2.
The hollow hydraulic feedback pump 9 is integrated with the lower part of the hollow sucker rod load shedding sucker device, the fixed part of the hollow hydraulic feedback pump 9 is integrated with the load shedding lower pump cylinder 7, the reciprocating part of the hollow hydraulic feedback pump 9 is integrated with the internal communication joint 8, the central hole 9-2 is communicated with the internal channel of the inner pipe 5, when the reciprocating part of the hollow hydraulic feedback pump 9 and the load shedding lower plunger 6 synchronously reciprocate, well fluid enters the hollow hydraulic feedback pump 9 from the oil inlet 9-3, is discharged from the oil outlet 9-1 after being pressurized by the hollow hydraulic feedback pump 9, and flows out of the outflow communication groove 1-1.
The load shedding pump cylinder 7 and the hollow hydraulic feedback pump 9 are placed in the outer pipe 10, the outer communication joint 4 is connected to the upper part of the outer pipe 10, the lateral communication hole 4-1 is arranged in the outer pipe 10, an annular channel 10-1 is formed between the outer pipe 10 and the load shedding pump cylinder 7 and between the outer pipe 10 and the hollow hydraulic feedback pump 9, the upper part of the annular channel 10-1 is communicated with the lateral communication hole 4-1, and the lower part of the annular channel 10-1 is communicated with the inlet of the hydraulic feedback pump 9.
The utility model is arranged on an oil pipe and a hollow sucker rod between a wellhead and an oil pump. The lower part of the utility model is connected with a lower oil pipe and a lower hollow sucker rod. The upper part of the upper hollow rod joint 1 is connected with an upper hollow sucker rod, and the upper part of the upper hollow sucker rod is connected with a pumping unit.
During oil pumping, the reciprocating motion parts of the upper hollow rod joint 1, the load-shedding upper plunger 3, the inner pipe 5, the load-shedding lower plunger 6, the internal communication joint 8 and the hollow hydraulic feedback pump 9 reciprocate along with the hollow sucker rod. The oil pump under the utility model pumps the well fluid into the hollow hydraulic feedback pump 9 (entering from the oil inlet 9-3), and the oil inlet valve and the oil outlet valve in the hollow hydraulic feedback pump 9 are alternately opened and closed, so that the well fluid is discharged from the oil outlet 9-1 after being pressurized, and flows into the communicating groove 8-1, the liquid outlet channel 5-1 and the liquid outlet communicating groove 1-1 to the upper part of the utility model through the flow-in communicating groove 8-1 and the liquid outlet channel 5-1, thereby realizing relay oil pumping, reducing the pressure of the oil pump under the utility model and achieving the 1 st beneficial effect of the utility model.
In the hollow sucker rod load-reducing sucker device consisting of an upper hollow rod joint 1, a load-reducing upper pump cylinder 2, a load-reducing upper plunger 3, an outer communicating joint 4, an inner pipe 5, a load-reducing lower plunger 6, a load-reducing lower pump cylinder 7 and an inner communicating joint 8, the upper end face of the load-reducing lower plunger 6 is communicated with the oil inlet 9-3 because the outer pipe 10 is arranged, and the pressure of the upper end face of the load-reducing lower plunger 6 is basically zero under the operation of the hollow hydraulic feedback pump 9. Therefore, the utility model can generate upward thrust at the installation position of the pipe column, thereby reducing the load of the sucker rod and the pumping unit and achieving the 2 nd beneficial effect of the utility model.
The central hole 9-2 is communicated with the inner channel of the inner tube 5, and after the hollow sucker rod is connected up and down, the device can be put into the central channel or liquid can be pumped into the central channel to carry out thick oil exploitation, so that the 3 rd beneficial effect of the utility model is achieved.
When the thick oil well is subjected to the thin oil mixing process, the mixed thin oil fills the sleeve, and a large liquid column pressure is formed in the sleeve, the outer pipe 10 is arranged, and the liquid column pressure formed in the sleeve by the mixed thin oil does not act on the upper end face of the load-reducing lower plunger 6, so that the load-reducing effect is not influenced when the sleeve is mixed with thin, viscosity-reducing and thick oil pumping is performed.
After the outer pipe 10 is arranged to form the annular channel 10-1, lost fluid generated by gaps between the load-shedding upper pump cylinder 2 and the load-shedding upper plunger 3, and between the load-shedding lower plunger 6 and the load-shedding lower pump cylinder 7 is enabled to flow back to the oil inlet 9-3 and be recovered by the hollow hydraulic feedback pump 9, so that the defect that the output of the existing sucker rod load-shedding device is lost is overcome, and the oil well output is improved.
The structure of the hollow hydraulic feedback pump 9 is a well known technology, such as the structure disclosed in SY/T7083-2016 is a hollow hydraulic feedback pump (the hollow hydraulic feedback pump is called an electric heating thick oil pump in the standard), the structure of the hollow hydraulic feedback pump 9 is various, the hollow hydraulic feedback pump can be matched with the hollow sucker rod load-reducing pumping device disclosed by the utility model, and the hollow hydraulic feedback pump with the same effect as the hollow sucker rod load-reducing pumping device disclosed by the utility model is within the protection scope of the utility model.
When the hollow hydraulic feedback pump 9 and the lower part of the hollow sucker rod load-shedding oil pumping device are combined into a whole, the load-shedding lower pump cylinder 7 can be a part on the hollow hydraulic feedback pump 9, and a part on the hollow hydraulic feedback pump 9 can also be the load-shedding lower pump cylinder 7, namely: the hollow sucker rod load shedding oil pumping device and the hollow hydraulic feedback pump 9 can share the load shedding lower pump cylinder 7.
The combination of the hollow hydraulic feedback pump 9 and the lower part of the hollow sucker rod load-reducing oil pumping device is divided into two cases, wherein when the hollow sucker rod load-reducing oil pumping device and the hollow hydraulic feedback pump 9 share the load-reducing pump cylinder 7, the hollow sucker rod load-reducing oil pumping device and the hollow hydraulic feedback pump 9 are integrated, and the hollow hydraulic feedback pump 9 is provided with only three pump cylinders; in another case, when the hollow sucker rod load-shedding oil pumping device and the hollow hydraulic feedback pump 9 do not share the load-shedding lower pump cylinder 7, the utility model has four pump cylinders, and the load-shedding lower pump cylinder 7 is connected with the upper pump cylinder of the hollow hydraulic feedback pump 9 into a whole.
The matching sealing of the plunger and the pump barrel means meeting the requirements specified in the GB/T17307 standard. The pump diameter refers to the inner diameter of the pump barrel of the oil pump.
Claims (1)
1. The hollow rod relay load-shedding deep pumping device comprises a hollow sucker rod load-shedding pumping device and a hollow hydraulic feedback pump (9);
wherein, the hollow sucker rod load-reducing oil pumping device comprises an upper hollow rod joint (1), a load-reducing upper pump barrel (2), a load-reducing upper plunger (3), an outer communicating joint (4), an inner pipe (5), a load-reducing lower plunger (6), a load-reducing lower pump barrel (7) and an inner communicating joint (8), the pump diameter of the load-reducing upper pump barrel (2) is smaller than that of the load-reducing lower pump barrel (7), the load-reducing upper plunger (3) is arranged in the load-reducing upper pump barrel (2), the load-reducing upper plunger (3) is sealed with the load-reducing upper pump barrel (2), the upper hollow rod joint (1), the load-reducing upper plunger (3), the load-reducing lower plunger (6) and the inner communicating joint (8) are sequentially connected, the upper hollow rod joint (1) is provided with a flow-out communicating groove (1-1), the inner communicating joint (8) is provided with a flow-in communicating groove (8-1), the load-reducing upper pump barrel (2), the outer communicating joint (4) and the load-reducing lower pump barrel (7) are sequentially connected, the load-reducing lower plunger (6) is in turn in the load-reducing upper pump barrel (7) and is in the side direction of the load-reducing upper pump barrel (4) and is in the side direction of the load-reducing pump barrel (4), an inner pipe (5) is arranged between the hollow rod joint (1) and the inner communication joint (8), a liquid outlet channel (5-1) is formed between the inner pipe (5) and the load-reducing lower plunger (6) and between the load-reducing upper plunger (3), sealing is kept between the upper end of the inner pipe (5) and the hollow rod joint (1), a sealing part between the upper end of the inner pipe (5) and the hollow rod joint (1) is positioned above the outflow communication groove (1-1), sealing is kept between the lower end of the inner pipe (5) and the inner communication joint (8), and a sealing part between the lower end of the inner pipe (5) and the inner communication joint (8) is positioned below the inflow communication groove (8-1), so that well liquid flowing into the liquid outlet channel (5-1) from the inflow communication groove (8-1) can only flow out of the outflow communication groove (1-1);
the hollow hydraulic feedback pump (9) consists of two pump cylinders with different pump diameters, two plungers matched with the pump cylinders, an oil inlet valve, an oil outlet valve and a connecting piece, wherein the upper part of the hollow hydraulic feedback pump (9) is provided with an oil outlet (9-1), the lower part of the hollow hydraulic feedback pump is provided with an oil inlet (9-3) and the inside of the hollow hydraulic feedback pump is provided with a central hole (9-2);
the hollow hydraulic feedback pump (9) is integrated with the lower part of the hollow sucker rod load-shedding pumping device, the fixed part of the hollow hydraulic feedback pump (9) is integrated with the load-shedding lower pump cylinder (7), the reciprocating part of the hollow hydraulic feedback pump (9) is integrated with the internal communication joint (8), the central hole (9-2) is communicated with the internal channel of the inner pipe (5), when the reciprocating part of the hollow hydraulic feedback pump (9) and the load-shedding lower plunger (6) synchronously reciprocate, well fluid enters the hollow hydraulic feedback pump (9) from the oil inlet (9-3), is discharged from the oil outlet (9-1) after being pressurized by the hollow hydraulic feedback pump (9), and flows out of the outflow communication groove (1-1);
the hydraulic feedback device is characterized by further comprising an outer tube (10), wherein the load-shedding lower pump cylinder (7) and the hollow hydraulic feedback pump (9) are placed in the outer tube (10), the outer communication joint (4) is connected to the upper portion of the outer tube (10), the lateral communication hole (4-1) is formed in the outer tube (10), an annular channel (10-1) is formed between the outer tube (10) and the load-shedding lower pump cylinder (7) and between the outer tube (10) and the hollow hydraulic feedback pump (9), the upper portion of the annular channel (10-1) is communicated with the lateral communication hole (4-1), and the lower portion of the annular channel (10-1) is communicated with an inlet of the hydraulic feedback pump (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320083308.1U CN220434715U (en) | 2023-01-29 | 2023-01-29 | Hollow rod Relay type load-shedding deep drawing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320083308.1U CN220434715U (en) | 2023-01-29 | 2023-01-29 | Hollow rod Relay type load-shedding deep drawing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220434715U true CN220434715U (en) | 2024-02-02 |
Family
ID=89696104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320083308.1U Active CN220434715U (en) | 2023-01-29 | 2023-01-29 | Hollow rod Relay type load-shedding deep drawing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220434715U (en) |
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2023
- 2023-01-29 CN CN202320083308.1U patent/CN220434715U/en active Active
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