CN219974777U - Tubular pump capable of being positively washed - Google Patents
Tubular pump capable of being positively washed Download PDFInfo
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- CN219974777U CN219974777U CN202321476927.3U CN202321476927U CN219974777U CN 219974777 U CN219974777 U CN 219974777U CN 202321476927 U CN202321476927 U CN 202321476927U CN 219974777 U CN219974777 U CN 219974777U
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- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000011010 flushing procedure Methods 0.000 claims description 53
- 238000010992 reflux Methods 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Details Of Reciprocating Pumps (AREA)
Abstract
The utility model relates to a positive well cleanable tubular pump, which comprises a pump cylinder assembly and a plunger assembly positioned in the pump cylinder assembly; the pump cylinder assembly comprises an outer cylinder, an inner cylinder is arranged in the outer cylinder, a double-pass joint is arranged at the bottom end of the inner cylinder, a first channel is arranged at the double-pass joint, the first channel is used for communicating the bottom space of the inner cylinder with the space in the outer cylinder below the double-pass joint, the double-pass joint is also used for shooting in a second channel, one end of the second channel is communicated with the space between the inner cylinder and the outer cylinder, an oil inlet valve assembly which only enables liquid to flow from the outer cylinder to the space between the outer cylinder and the inner cylinder is arranged at the other end of the second channel, and a fixed valve assembly is connected at the bottom end of the outer cylinder; the well pipe type pump can realize forward washing, avoids pollution and damage to an oil layer, and reduces heat loss.
Description
Technical Field
The utility model relates to the technical field of oil pumping equipment, in particular to a tubular pump capable of being positively washed.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, more than 90% of oil field use rod oil pump equipment is tubular pump, when oil well normal production meets trouble and needs to wash well, for example oil pipe paraffin removal, this is a common oil well trouble, and the common practice is to use hot washing well, because of the existence of the check valve at the lower end of the underground tubular pump, the well is generally backwashed, namely high Wen Xijing liquid is injected into a well bore from an oil and casing annular space, passes through the check valve at the lower end of the oil pump, returns out of a wellhead from the oil pipe, and melts the paraffin and brings out of the well bore in the process. The problem brought by the back flushing is remarkable, firstly, the flushing fluid can enter an oil layer to pollute and destroy the oil layer, and the formation fluid is influenced, so that normal production cannot be carried out; secondly, the well flushing efficiency is low, the heat delay loss is large due to long back flushing distance, the number of times of the circulation of the well flushing liquid is large, the well flushing time is long, and unnecessary waste and cost increase are caused.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a tubular pump capable of being positively washed, so that pollution and damage to stratum are avoided during well washing, and high efficiency is maintained.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the embodiment of the utility model provides a tubular pump capable of being positively washed, which comprises a pump cylinder assembly and a plunger assembly positioned in the pump cylinder assembly;
the pump cylinder assembly comprises an outer cylinder, an inner cylinder is arranged in the outer cylinder, a double-pass joint is arranged at the bottom end of the inner cylinder, a first channel is arranged at the double-pass joint, the first channel is used for communicating the bottom space of the inner cylinder with the space in a reflux joint below the double-pass joint, the reflux joint is connected to the bottom end of the outer cylinder, the top end of the reflux joint is fixed with the bottom end of the double-pass joint, a second channel is also arranged at the double-pass joint, one end of the second channel is communicated with the space between the inner cylinder and the outer cylinder, an oil inlet valve assembly which only enables liquid to flow from the reflux joint to the space between the outer cylinder and the inner cylinder is arranged at the other end of the second channel, and the bottom end of the reflux joint is connected with a fixed valve assembly;
the plunger assembly comprises a plunger arranged in the inner cylinder, the plunger is in sliding connection with the inner cylinder, and the bottom end of the plunger is connected with a well flushing valve assembly which only allows liquid to flow downwards along the plunger.
Optionally, the urceolus includes the barrel, and the barrel top is connected with the top connection, and the top connection is used for connecting oil pipe, and the barrel bottom is equipped with the backflow joint, and the backflow joint is connected the fixed valve assembly.
Optionally, the oil inlet valve assembly includes an oil inlet valve cover, and oil inlet valve cover top is connected with the second passageway, and oil inlet valve cover bottom is connected with the oil feed and blocks up, is equipped with the oil inlet valve in the oil inlet valve cover inside, and the oil inlet valve adopts the check valve that only allows liquid to flow to its top second passageway by the back flow joint inner space of its below.
Optionally, the first passageway includes total passageway, and total passageway and the coaxial setting of bi-pass joint, total passageway and inner tube inner space intercommunication, and total passageway bottom edge position intercommunication has a plurality of branch channels, branch channel one end and total passageway intercommunication, the other end and the back flow joint inner space intercommunication below the bi-pass joint.
Optionally, the plurality of branch channels are distributed at equal intervals along a set circumference, and the circle center of the set circumference is positioned on the axis of the double-pass joint.
Optionally, the second channel of the two-way joint is disposed off-center from the two-way joint.
Optionally, the plunger top is connected with hollow pole joint, and hollow pole joint is used for connecting hollow pole.
Optionally, the well flushing valve assembly includes the well flushing valve cover, and the top of well flushing valve cover is connected with the bottom of double-end screw spare, and the top and the plunger bottom of double-end screw spare are connected, and the bottom of well flushing valve cover is connected with the top that the valve cover connects, and the bottom that the valve cover connects is connected with the direction and blocks up, is equipped with the valve ball in the well flushing valve cover, and the valve ball top is equipped with rather than complex disk seat, and the valve ball below is equipped with the dog, dog and valve cover connect top elastic connection.
Optionally, the inner tube includes the pump barrel, and pump barrel top is connected with direction centering ring, and direction centering ring and urceolus clearance fit, and the bottom of pump barrel is connected with the extension section of thick bamboo, and the bi-pass joint is connected to the bottom of extension section of thick bamboo.
Optionally, the fixed valve assembly includes fixed valve bonnet, and the top of fixed valve bonnet is connected with the bottom of urceolus, and the bottom of fixed valve bonnet is connected with fixed valve bonnet joint, is equipped with the fixed valve in the fixed valve bonnet, and the fixed valve is the check valve that only allows liquid to flow to the urceolus by fixed valve bonnet joint.
The beneficial effects of the utility model are as follows:
the well cleanout pipe pump is provided with the double-way joint and the oil inlet valve assembly, when well cleanout is carried out, well cleanout liquid enters from the inner hole of the hollow rod, the well cleanout valve assembly can be opened, well cleanout liquid can enter a first channel of the double-way joint through a pump cavity of the inner cylinder, then enters a second channel of the double-way joint after the oil inlet valve assembly is opened by an outer cylinder space below the double-way joint, then enters a space between the outer cylinder and the inner cylinder and is discharged into an oil pipe to return to a ground well cleanout pump truck, positive circulation well cleanout is realized, well cleanout liquid can not enter stratum due to the existence of the fixed valve assembly at the lower end of the pump cylinder assembly, well cleanout circulation is directly established from the annular space of the hollow rod and the oil pipe to the ground, damage and pollution of a well cleanout to an oil layer are avoided, heat loss caused by the well cleanout liquid entering a sleeve is avoided, and meanwhile, the length of well cleanout circulation is greatly shortened, the well cleanout liquid consumption is reduced, the well cleanout efficiency is high.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a schematic view showing the overall structure of embodiment 1 of the present utility model;
FIG. 2 is an enlarged schematic view of a portion of a well cleanout valve assembly according to example 1 of the present utility model;
FIG. 3 is a schematic view of a two-way joint according to embodiment 1 of the present utility model;
FIG. 4 is a schematic view of the cross-section A of FIG. 3 in accordance with the present utility model;
FIG. 5 is a schematic view showing the structure of a valve bonnet joint according to embodiment 1 of the present utility model;
FIG. 6 is a schematic view of the cross-section B of FIG. 5 in accordance with the present utility model;
wherein, 1, a hollow rod joint, 2, a plunger, 3, a double-head screw element, 4, a valve ball, 5, a stop block, 6, a spring, 7, a well flushing valve cover, 8, a valve cover joint, 9, a guide plug, 10, an upper joint, 11, a guide centering ring, 12, a pump cylinder, 13, an extension cylinder, 14, barrel, 15, two-way joint, 151, first passage, 152, second passage, 16, oil inlet valve housing, 17, oil inlet valve, 18, oil inlet plug, 19, return joint, 20, stationary valve, 21, stationary valve housing, 22, stationary valve housing joint.
Detailed Description
Example 1
This embodiment provides a positive displacement tubular pump, as shown in fig. 1, comprising a pump cylinder assembly and a plunger assembly positioned within the pump cylinder assembly.
The pump cylinder assembly comprises an outer cylinder and an inner cylinder, wherein the inner cylinder is positioned inside the outer cylinder and is coaxially arranged with the outer cylinder, and an annular cavity is formed between the inner cylinder and the outer cylinder.
The outer cylinder comprises a cylinder body 14, the top end of the cylinder body 14 is in threaded connection with an upper joint 10 through an internal thread structure, and the upper part of the upper joint 10 is provided with the internal thread structure for connecting an oil pipe.
The bottom of the cylinder 14 is provided with an internal thread structure and is in threaded connection with the top of the backflow joint 19 through the internal thread structure, and the bottom of the backflow joint 19 is connected with a fixed valve assembly. The return joint 19 adopts a cylindrical tubular structure, the top end of which is provided with an external thread structure, and the bottom end of which is provided with an internal thread structure.
The fixed valve assembly adopts the existing structure, including fixed valve bonnet 21, the top of fixed valve bonnet 21 is equipped with external screw thread structure to through external screw thread structure and the bottom threaded connection of backflow joint 19, the bottom of fixed valve bonnet 21 is equipped with internal screw thread structure, and with the top threaded connection of fixed valve bonnet joint 22.
The fixed valve cover 21 is internally provided with a fixed valve 20, and the fixed valve 20 adopts a one-way valve and only allows liquid to flow from bottom to top, namely only allows liquid to flow from the fixed valve cover joint 22 to the backflow joint 19.
The inside pump chamber that forms of inner tube, including pump cylinder 12, the bottom fixed connection of pump cylinder 12's top and direction centering ring 11, direction centering ring 11 has the clearance of settlement with the internal surface of barrel 14, reduces the radial rocking of inner tube, can guarantee the axiality of inner tube and urceolus through direction centering ring 11.
The bottom end of the pump cylinder 12 is provided with an external thread structure, and is in threaded connection with the top end of the lengthening cylinder 13 through the external thread structure.
The bottom end of the lengthening cylinder 13 is provided with an external thread structure and is fixed with the top end of the double-pass joint 15 through the external thread structure. The bottom end of the two-way joint 15 is fixedly connected with the top end of the reflux joint 19 through an external thread structure in a threaded manner.
As shown in fig. 3-4, the two-way joint 15 is provided with a first channel 151 and a second channel 152.
The first channel 151 comprises a main channel, the main channel is arranged at the center of the top surface of the double-pass joint and is coaxially arranged with the double-pass joint, and the main channel is provided with an internal thread structure and is fixedly connected with the bottom thread of the lengthening cylinder 13 through the internal thread structure.
A plurality of branch channels are arranged at the edge of one side of the main channel, the top ends of the branch channels are communicated with the main channel, and the bottom ends of the branch channels extend to the bottom surface of the two-way joint 15 and are communicated with the inner space of the reflux joint 19 below the two-way joint 15.
In this embodiment, the plurality of branch channels are distributed at equal intervals along the circumferential direction of the set circumference, and the center of the set circumference is located on the axis of the two-way structure 15, preferably, four branch channels are provided.
The eccentric position of the bottom surface of the two-way joint is provided with a second channel 152, the second channel 152 comprises two parts, the vertical part of the second channel is coaxially arranged with the axis of the two-way joint 15 and extends to the bottom surface of the two-way joint, one end of the horizontal part of the second channel is communicated with the vertical part, and the other end of the horizontal part of the second channel extends to the side surface of the two-way joint 15 and is communicated with the annular cavity between the outer cylinder and the inner cylinder.
Wherein the bottom end of the vertical portion of the second channel 152 is provided with an internal thread structure, and is connected with an oil inlet valve assembly through the internal thread structure in a threaded manner, and the oil inlet valve assembly is located in the inner space of the backflow joint 19.
The oil inlet valve assembly comprises an oil inlet valve cover 16, an external thread structure is arranged at the top end of the oil inlet valve cover 16 and is in threaded connection with the vertical part of the second channel 152, an oil inlet plug 18 is in threaded connection with the bottom end of the oil inlet valve cover 16, an oil inlet valve 17 is arranged in the oil inlet valve cover 16, and the oil inlet valve 17 adopts a one-way valve, so that liquid can only flow from bottom to top, namely from the inner space of the backflow joint 19 to the second channel 152.
The plunger assembly comprises a plunger 2, wherein the plunger 2 stretches into the inner cylinder and is in sliding connection with the pump cylinder 12, and the plunger 2 can do reciprocating linear motion along the axis direction of the plunger 2.
The plunger 2 adopts a cylindrical tubular structure, the top end of the plunger is provided with an internal thread structure and is in threaded connection with a hollow rod joint 1, and the hollow rod joint 1 is used for connecting a hollow rod.
The bottom of plunger 2 is equipped with internal thread structure to threaded connection has double-end screw member 3, and double-end screw member 3 adopts cylinder tubular structure, and its both ends all are equipped with external thread structure, and the plunger 2 is passed through external thread structure threaded connection in the top, and the bottom passes through external thread structure and connects the well flushing valve assembly.
The well flushing valve assembly comprises a well flushing valve cover 7, the top end of the well flushing valve cover 7 is connected with the bottom end of the double-head threaded piece 3 through an internal thread structure in a threaded mode, the bottom end of the well flushing valve cover 7 is connected with the top end of a valve cover joint 8 through an internal thread structure in a threaded mode, and the bottom end of the valve cover joint 8 is connected with a guide plug 9 through an external thread structure in a threaded mode.
The valve bonnet joint 8 is of a cylindrical tubular structure, a channel communicated with the inner space of the well flushing valve bonnet 7 above the valve bonnet joint is arranged, the guide plug 9 is provided with a channel communicated with the inner space of the valve bonnet joint 8, and the channel is communicated with the inner space of the valve bonnet joint 8 and the bottom space of the inner cylinder.
As shown in fig. 2, a valve ball 4 is disposed in the well-flushing valve cover 7, a valve seat is disposed above the valve ball 4, the valve seat adopts a circular ring structure, the valve ball 4 is in a seat sealing state after being in contact with the valve seat, the top surface of the valve seat is in contact with the bottom surface of the double-head threaded member 3, the bottom surface of the valve seat is in contact with an annular positioning table disposed on the inner surface of the well-flushing valve cover 7, and the valve seat is pressed by the annular positioning table and the double-head threaded member 3.
The dog 5 that is equipped with rather than the valve ball 4 below, the dog 5 is the arcwall face for the upper surface that contacts with valve ball 4, the dog is equipped with a plurality of passageways that are used for the liquid to pass through, the bottom of dog 5 is connected with the one end of spring 6, the other end of spring 6 inserts in the boss that valve bonnet joint 8 upper end set up, under the elasticity effect of spring 6, valve ball 4 and disk seat contact realize the seat seal, when liquid from top to bottom, can drive valve ball 4 break away from the disk seat, realize the opening of well-flushing valve assembly, therefore the well-flushing valve assembly has realized the function of check valve, can only allow the liquid to flow from top to bottom, namely by double-end screw 3 to the direction flow of valve bonnet joint 8.
The working principle of the positive well cleanable tubular pump of the embodiment is as follows:
the plunger assembly goes upward, the valve ball 4 is in contact with the valve seat and is in a seat sealing state, the oil inlet valve 17 is in a seat sealing state, oil in the oil pipe is discharged out of the ground, meanwhile, the fixed valve 20 is opened, and the oil sequentially passes through the inner space of the fixed valve cover joint 22, the fixed valve 20 and the backflow joint 19, and enters the pump cavity of the inner cylinder after passing through the first channel 151 of the double-pass joint 15.
When the plunger assembly descends, the oil inlet valve 17 is opened, the well flushing valve assembly and the fixed valve 20 are in a seat sealing state, and oil in the pump cavity sequentially passes through the first channel 151 of the double-pass joint 15, the backflow joint 19, the oil inlet plug 18, the oil inlet valve 17 and the second channel 152 of the double-pass joint 15 to enter an annular space among the lengthened cylinder 13, the pump cylinder 12 and the outer cylinder, and then is discharged into an oil pipe.
The working principle of the positive well flushing in this embodiment is as follows:
when well flushing operation is needed, well flushing liquid enters from the inner hole of the hollow rod through the ground well flushing pump truck, after the well flushing liquid reaches the position of the hollow rod joint 1, the valve ball 4 is separated from the valve seat through the inner space of the plunger 2 under the action of the elastic force of the spring 6 by overcoming the well flushing hydraulic force, the well flushing valve assembly is opened, the well flushing liquid sequentially passes through the well flushing valve cover 7, the valve cover joint 8, the guide plug 9, the pump cavity at the bottom of the inner cylinder and the first channel 151 of the double-pass joint 15, the backflow joint 19, the oil inlet plug 18, the oil inlet valve 17 and the second channel 152 of the double-pass joint 15, enters the annular space between the lengthened cylinder 13, the pump cylinder 12 and the outer cylinder, and then is discharged into the oil pipe to return to the ground well flushing pump truck, so that 1 positive circulation well flushing is completed, and multiple circulation well flushing can be performed according to the on-site well flushing effect.
Because the fixed valve assembly at the lower end of the pump barrel assembly exists, well flushing liquid can not enter the stratum, directly returns to the ground from the annular space of the hollow rod and the oil pipe, damage and pollution of a backwash well to an oil layer are avoided, well flushing circulation is established in the positive well flushing pipe pump, heat loss of the well flushing liquid entering the casing is avoided, and meanwhile, the length of the well flushing circulation is greatly shortened because the well flushing liquid does not need to enter the stratum, the consumption of the well flushing liquid is reduced, the well flushing time is shortened, and the well flushing efficiency is high.
While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (10)
1. The positive flushing tubular pump is characterized by comprising a pump cylinder assembly and a plunger assembly positioned in the pump cylinder assembly;
the pump cylinder assembly comprises an outer cylinder, an inner cylinder is arranged in the outer cylinder, a double-pass joint is arranged at the bottom end of the inner cylinder, a first channel is arranged at the double-pass joint, the first channel is used for communicating the bottom space of the inner cylinder with the space in a reflux joint below the double-pass joint, the reflux joint is connected to the bottom end of the outer cylinder, the top end of the reflux joint is fixed with the bottom end of the double-pass joint, a second channel is also arranged at the double-pass joint, one end of the second channel is communicated with the space between the inner cylinder and the outer cylinder, an oil inlet valve assembly which only enables liquid to flow from the reflux joint to the space between the outer cylinder and the inner cylinder is arranged at the other end of the second channel, and the bottom end of the reflux joint is connected with a fixed valve assembly;
the plunger assembly comprises a plunger arranged in the inner cylinder, the plunger is in sliding connection with the inner cylinder, and the bottom end of the plunger is connected with a well flushing valve assembly which only allows liquid to flow downwards along the plunger.
2. The positive well cleanable tubular pump of claim 1, wherein the outer barrel comprises a barrel, an upper connector is connected to the top end of the barrel, the upper connector is used for connecting an oil pipe, a backflow connector is arranged at the bottom end of the barrel, and the backflow connector is connected with the fixed valve assembly.
3. The positive well cleanable tubular pump of claim 1, wherein the oil inlet valve assembly comprises an oil inlet valve housing, the top end of the oil inlet valve housing is connected with the second channel, the bottom end of the oil inlet valve housing is connected with an oil inlet plug, and an oil inlet valve is arranged in the oil inlet valve housing and adopts a one-way valve which only allows liquid to flow from the inner space of the outer cylinder below the oil inlet valve housing to the second channel above the oil inlet valve housing.
4. The positive well cleanable tubular pump of claim 1, wherein the first passageway comprises a main passageway coaxially disposed with the double-pass connector, the main passageway is in communication with the inner space of the inner barrel, a plurality of branch passageways are in communication with the bottom edge of the main passageway, one end of each branch passageway is in communication with the main passageway, and the other end of each branch passageway is in communication with the inner space of the outer barrel below the double-pass connector.
5. A positive displacement tubular pump as claimed in claim 4, wherein the plurality of branch passages are circumferentially equally spaced along a predetermined circumference, the center of the predetermined circumference being located on the axis of the double-pass joint.
6. A positive displacement tubular pump as claimed in claim 4, wherein the second passageway of the two-way fitting is disposed off-centre from the two-way fitting.
7. A positive displacement tubular pump as claimed in claim 1, wherein the plunger tip is connected to a hollow rod fitting for connection to a hollow rod.
8. The positive-displacement tubular pump of claim 1, wherein the well-flushing valve assembly comprises a well-flushing valve housing, the top end of the well-flushing valve housing is connected with the bottom end of the double-threaded member, the top end of the double-threaded member is connected with the bottom end of the plunger, the bottom end of the well-flushing valve housing is connected with the top end of the valve housing joint, the bottom end of the valve housing joint is connected with the guide plug, a valve ball is arranged in the well-flushing valve housing, a valve seat matched with the valve ball is arranged above the valve ball, a stop block is arranged below the valve ball, and the stop block is elastically connected with the top end of the valve housing joint.
9. The positive well cleanable tubular pump of claim 1, wherein the inner barrel comprises a pump barrel, the top end of the pump barrel is connected with a guide centralizing ring, the guide centralizing ring is in clearance fit with the outer barrel, the bottom end of the pump barrel is connected with an extension barrel, and the bottom end of the extension barrel is connected with a two-way joint.
10. The positive-displacement tube pump of claim 1, wherein the fixed valve assembly comprises a fixed valve housing, wherein the top end of the fixed valve housing is connected with the bottom end of the outer tube, the bottom end of the fixed valve housing is connected with a fixed valve housing joint, and a fixed valve is arranged in the fixed valve housing and is a one-way valve which only allows liquid to flow from the fixed valve housing joint to the outer tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321476927.3U CN219974777U (en) | 2023-06-09 | 2023-06-09 | Tubular pump capable of being positively washed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321476927.3U CN219974777U (en) | 2023-06-09 | 2023-06-09 | Tubular pump capable of being positively washed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219974777U true CN219974777U (en) | 2023-11-07 |
Family
ID=88576820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321476927.3U Active CN219974777U (en) | 2023-06-09 | 2023-06-09 | Tubular pump capable of being positively washed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219974777U (en) |
-
2023
- 2023-06-09 CN CN202321476927.3U patent/CN219974777U/en active Active
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