CN211845602U - Piston assembly of emulsion pump - Google Patents
Piston assembly of emulsion pump Download PDFInfo
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- CN211845602U CN211845602U CN202020212730.9U CN202020212730U CN211845602U CN 211845602 U CN211845602 U CN 211845602U CN 202020212730 U CN202020212730 U CN 202020212730U CN 211845602 U CN211845602 U CN 211845602U
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Abstract
The utility model relates to a piston component of an emulsion pump, which comprises a main column, a piston and an auxiliary column, wherein the upper end of the auxiliary column is connected with the lower end of the main column, the piston is annular and is sleeved on the auxiliary column, and the inner side wall of the piston is in close contact with the outer side wall of the auxiliary column; the lower end of the main column is provided with a first annular end surface; the auxiliary column comprises an upper cylindrical part, a middle cylindrical part, a sealing sheet and a circular truncated cone-shaped lower limiting part with a small upper part and a large lower part, and the upper cylindrical part, the middle cylindrical part, the sealing sheet and the circular truncated cone-shaped lower limiting part are integrally manufactured; the upper cylindrical part is sleeved on the lower end of the main column, and the upper end surface of the upper cylindrical part is in close contact with the first annular end surface; the sealing piece is arranged at the lower end of the middle cylinder part and seals the lower end of the middle cylinder part, at least one liquid inlet hole is arranged on the side wall of the middle cylinder part, and the liquid inlet hole is communicated with the first flow channel; the lower end of the circular truncated cone-shaped lower limiting part is provided with a first annular groove with an upward opening, and the piston is located between the first annular end face and the first annular groove. The piston assembly is simple in structure, simple and convenient to machine and beneficial to reducing production cost.
Description
Technical Field
The utility model relates to a liquid outlet component of cosmetics and bath articles, in particular to a piston assembly of a lotion pump.
Background
With the improvement of living standard, people always need to use various cosmetics and bath articles, and the emulsion pump is designed delicately and is convenient to use, so that the emulsion pump is often used for the pressure pumps of shampoo, shower gel and hand sanitizer, the pump head is designed to be cleaner and more sanitary, cross infection is avoided, and the emulsion pump is deeply affirmed by consumers.
Emulsion pumps on the market generally comprise a press head, screw threads, a screw thread outer cover, a pump body, a piston assembly and a compression spring; the screw thread is arranged at the upper end of the pump body, and the outer cover of the screw thread is sleeved at the outer side of the upper end of the pump body; a liquid inlet is formed in the bottom of the pump body, and a first check valve is arranged at the liquid inlet; the piston assembly and the compression spring are arranged in the pump body, the piston assembly comprises a main column, a piston and an auxiliary column, the upper end of the auxiliary column is connected with the lower end of the main column, the press head is connected with the upper end of the main column, a first flow passage which runs up and down is arranged in the auxiliary column, a second flow passage which runs up and down is arranged in the main column, a third flow passage is arranged in the press head, the first flow passage, the second flow passage and the third flow passage are sequentially communicated, and a second check valve is arranged at the top of the second flow passage; the piston is annular and is sleeved on the main column, the inner side wall of the piston is tightly contacted with the outer side wall of the main column, and the outer side wall of the piston is tightly contacted with the inner side wall of the pump body; the outer side wall of the main column is provided with a limiting ring, the lower side surface of the limiting ring is provided with an annular groove with a downward opening, and the upper end of the piston is matched with the annular groove (when the piston ascends relative to the main column, the upper end of the piston can be embedded into the annular groove); the upper end of the compression spring is in contact with the auxiliary column, and the lower end of the compression spring is in contact with the pump body (the compression spring can apply upward acting force to the auxiliary column to enable the auxiliary column, the main column and the piston to ascend and reset). The second check valve comprises a second glass ball and a second valve seat formed at the top of the main column, the second valve seat is provided with a second truncated cone-shaped cavity with a large upper part and a small lower part (the bottom of the second truncated cone-shaped cavity is communicated with the second flow passage, and the top of the second truncated cone-shaped cavity is communicated with the third flow passage), and the second glass ball is positioned in the second truncated cone-shaped cavity.
In the emulsion pump, the second check valve is arranged at the top of the second flow channel (namely the top of the main column), the second valve seat with the second truncated cone-shaped cavity with the large upper part and the small lower part is required to be arranged at the top of the main column, and the second glass ball is arranged in the second truncated cone-shaped cavity, so that the internal structure of the main column is complex, the processing is complex, and the production cost is high.
Disclosure of Invention
The utility model aims to solve the problem that a piston assembly of emulsion pump is provided, this kind of piston assembly structure is comparatively simple, and processing is simple and convenient, is favorable to reduction in production cost.
In order to solve the technical problem, the utility model discloses a technical scheme as follows:
a piston assembly of an emulsion pump comprises a main column, a piston and an auxiliary column, wherein the upper end of the auxiliary column is connected with the lower end of the main column, the piston is annular and is sleeved on the auxiliary column, and the inner side wall of the piston is tightly contacted with the outer side wall of the auxiliary column; a first flow passage is arranged in the auxiliary column, a second flow passage which runs up and down is arranged in the main column, and the second flow passage is communicated with the first flow passage; the method is characterized in that: the lower end of the main column is provided with a first annular end face; the auxiliary column comprises an upper cylindrical part, a middle cylindrical part, a sealing sheet and a circular truncated cone-shaped lower limiting part with a small upper part and a large lower part, and the upper cylindrical part, the middle cylindrical part, the sealing sheet and the circular truncated cone-shaped lower limiting part are integrally manufactured; the upper cylindrical part is sleeved on the lower end of the main column, and the upper end surface of the upper cylindrical part is in close contact with the first annular end surface; the sealing piece is arranged at the lower end of the middle cylinder part and seals the lower end of the middle cylinder part, at least one liquid inlet hole is arranged on the side wall of the middle cylinder part, and the liquid inlet hole is communicated with the first flow channel; the lower end of the circular truncated cone-shaped lower limiting part is provided with a first annular groove with an upward opening, and the piston is located between the first annular end face and the first annular groove.
The emulsion pump generally comprises a press head, a screw thread, a pump body, a plastic spring and a lock cover; the screw thread is arranged at the upper end of the pump body; the locking cover can be rotatably arranged on the screw teeth; a liquid inlet is arranged at the bottom of the pump body, and a check valve is arranged at the liquid inlet; the press head is connected with the upper end of the main column, and the plastic spring is sleeved on the main column and is positioned between the press head and the lock cover; the press head is provided with a third flow passage, and the first flow passage, the second flow passage and the third flow passage are communicated in sequence. The screw teeth are used for being connected with the bottle mouth of the packaging bottle, so that the lotion pump is installed on the packaging bottle. The top of the pump body is also provided with an annular gasket, the upper end face of the annular gasket is in close contact with the lower end face of the top of the pump body, and the lower end face of the annular gasket is in close contact with the upper end face of the bottle opening of the packaging bottle, so that the packaging bottle is in sealed fit with the pump body.
When the product packaged by the packaging bottle is in an unused state, the plastic spring is in an extension state (with small pressure) and is positioned between the press head and the lock cover; because the inside wall in close contact with of piston and the outside wall in close contact with of auxiliary column, the outside wall of piston and the inside wall in close contact with of the pump body to and the check valve of pump body bottom seals the inlet, consequently the pump body cavity above the check valve is in the encapsulated situation, and at this moment, there is not emulsion in third runner, second runner and the first runner. The upper end surface of the upper cylindrical part is in sealing fit with the first annular end surface at the lower end of the main column, so that the sealing between the main column and the auxiliary column can be enhanced. The button is tightly buckled with the main column, the connection is very firm, and the button can not be separated from the whole bottle of emulsion even if the button is directly lifted by hands.
The piston has two working positions of ascending to a high position and descending to a low position: when the press head is pressed, the piston rises to a high position, the upper end of the piston is in sealing fit with the first annular end face at the lower end of the main column at the moment, the sealing between the piston and the main column can be enhanced, the lower end of the piston is separated from the first annular groove of the auxiliary column, and the liquid inlet hole of the first flow channel is opened, so that the liquid inlet hole is communicated with the cavity of the pump body, and emulsion in the cavity at the lower part of the pump body can smoothly enter the first flow channel; when the press head is released, the piston descends to a low position, the upper end of the piston is separated from the first annular end face of the lower end of the main column at the moment, the lower end of the piston is in sealing fit with the first annular groove of the auxiliary column, sealing between the piston and the auxiliary column can be enhanced, the liquid inlet hole of the first flow channel is separated from the cavity of the pump body, and negative pressure is generated in the cavity of the lower part of the pump body.
When the piston pump is used, the press head is pressed downwards, the piston assembly moves downwards along the inner side wall of the pump body, the plastic spring is compressed at the moment, the piston rises to a high position, and the liquid inlet hole is opened; because the piston assembly is in sealing fit with the pump body, the check valve at the bottom of the pump body seals the liquid inlet under the pressure of emulsion, the emulsion cannot flow back, and the emulsion in the cavity of the pump body can only flow out of the liquid inlet hole in the auxiliary column, the first flow passage, the second flow passage in the main column and the third flow passage in the press head in sequence. When the press head is released, the press head and the piston assembly rise and reset under the action of the plastic spring, the piston descends to a low position and closes the liquid inlet hole, negative pressure is generated in the pump body cavity in the rising process of the press head and the piston assembly, the check valve at the bottom of the pump body is opened, and emulsion in the packaging bottle enters the pump body cavity through the liquid inlet.
The piston assembly of the emulsion pump does not need to be provided with the check valve at the top of the main column, and can play a role of the check valve only by utilizing the matching among the piston, the auxiliary column and the liquid inlet hole, so that the emulsion in the cavity at the lower part of the pump body flows into the first flow channel from the liquid inlet hole, the structure is simpler, the matching mode of the piston assembly is changed, the processing is simple and convenient, and the production cost is reduced.
As the preferred scheme of the utility model, the principal post lower extreme is in the inner chamber of last cylindric portion, the lateral wall of principal post and the inside wall in close contact with of last cylindric portion. The outer side wall of the main column is in sealing fit with the inner side wall of the upper cylindrical part, so that sealing between the main column and the auxiliary column can be enhanced.
As a preferable scheme of the present invention, the piston includes an outer ring, an annular connecting portion, and an inner ring, the outer ring, the annular connecting portion, and the inner ring being integrally formed; the upper end of the inner ring is provided with a second annular end surface which is matched with the first annular end surface; an inner limiting ring is arranged on the inner side of the inner ring, and the inner side wall of the inner limiting ring is in close contact with the outer side wall of the upper cylindrical part; the lower end of the inner ring is matched with the first annular groove. The outer side wall of the outer ring is in close contact with the inner side wall of the pump body of the emulsion pump. When the press head is pressed, the piston rises to a high position, at the moment, the second annular end face at the upper end of the inner ring is in sealing fit with the first annular end face at the lower end of the main column, the sealing between the piston and the main column can be enhanced, and the inner side wall of the inner limiting ring is in sealing fit with the outer side wall of the upper cylindrical part, so that the sealing between the piston and the auxiliary column can be enhanced, emulsion in a cavity at the lower part of the pump body can smoothly enter the first flow channel, and the emulsion is prevented from leaking to the; when the press head is released, the piston descends to a low position, the second annular end face at the upper end of the inner ring is separated from the first annular end face at the lower end of the main column, the lower end of the inner ring is in sealing fit with the first annular groove at the lower part of the auxiliary column, and the inner side wall of the inner limiting ring is in sealing fit with the outer side wall of the upper cylindrical part, so that the sealing between the piston and the auxiliary column can be enhanced.
As a further preferred scheme of the utility model, the lower extreme of interior spacing ring is equipped with third annular end face, the upper end of well drum portion is equipped with fourth annular end face, and fourth annular end face cooperatees with third annular end face. When the piston rises to a high position, the third annular end surface at the lower end of the inner limiting ring is separated from the fourth annular end surface at the upper end of the middle cylinder part; when the piston descends to a low position, the third annular end face at the lower end of the inner limiting ring is in sealing fit with the fourth annular end face at the upper end of the middle cylinder part, and sealing between the piston and the auxiliary column can be enhanced.
Compared with the prior art, the utility model, have following advantage:
the piston assembly of the emulsion pump has a simple structure, changes the matching mode of the piston assembly, is simple and convenient to process, and is beneficial to reducing the production cost.
Drawings
FIG. 1 is a schematic diagram of a piston assembly and an emulsion pump having the piston assembly according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the embodiment of the present invention in which the piston ascends to the high position.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-2, the piston assembly of the emulsion pump in this embodiment includes a main column 1, a piston 2 and an auxiliary column 3, wherein the upper end of the auxiliary column 3 is connected with the lower end of the main column 1, the piston 2 is annular and is sleeved on the auxiliary column 3, and the inner side wall of the piston 2 is in close contact with the outer side wall of the auxiliary column 3; a first flow channel 36 is arranged in the auxiliary column 3, a second flow channel 11 which runs up and down is arranged in the main column 1, and the second flow channel 11 is communicated with the first flow channel 36; the lower end of the main column 1 is provided with a first annular end surface 12; the sub-column 3 includes an upper cylinder portion 31, a middle cylinder portion 32, a sealing piece 33, and a circular truncated cone-shaped lower limit portion 34 having a small upper part and a large lower part, and the upper cylinder portion 31, the middle cylinder portion 32, the sealing piece 33, and the circular truncated cone-shaped lower limit portion 34 are integrally formed; the upper cylindrical part 31 is sleeved on the lower end of the main column 1, and the upper end surface of the upper cylindrical part 31 is tightly contacted with the first annular end surface 12; the sealing sheet 33 is arranged at the lower end of the middle cylinder part 32 and seals the lower end of the middle cylinder part 32, a plurality of liquid inlet holes 321 are arranged on the side wall of the middle cylinder part 32, and the liquid inlet holes 321 are communicated with the first flow channel 36; the lower end of the truncated cone-shaped lower limiting part 34 is provided with a first annular groove 35 with an upward opening, and the piston 2 is positioned between the first annular end surface 12 and the first annular groove 35.
The emulsion pump also comprises a press head 4, a screw thread 5, a pump body 6, a plastic spring 7 and a lock cover 9; the screw teeth 5 are arranged at the upper end of the pump body 6; the locking cover 9 can be rotatably arranged on the screw thread 5; a liquid inlet 61 is arranged at the bottom of the pump body 6, and a check valve 7 is arranged at the liquid inlet 61; the press head 4 is connected with the upper end of the main column 1, and the plastic spring 7 is sleeved on the main column 1 and is positioned between the press head 4 and the lock cover 9; the button head 4 is provided with a third flow channel 41, and the first flow channel 36, the second flow channel 11 and the third flow channel 41 are communicated in sequence. The screw teeth 5 are used for being connected with the bottle mouth of the packaging bottle, so that the lotion pump is installed on the packaging bottle. Above-mentioned 6 tops of pump body still are equipped with annular gasket 8, and the terminal surface in close contact with under 8 up end of annular gasket and the 6 tops of pump body, terminal surface in close contact with on 8 lower terminal surfaces of annular gasket and the bottleneck of packing bottle for packing bottle and the sealed cooperation of the pump body 6.
The lower end of the main column 1 is positioned in the inner cavity of the upper cylindrical part 31, and the outer side wall of the main column 1 is in close contact with the inner side wall of the upper cylindrical part 31. The outer side wall of the main column 1 is in sealing engagement with the inner side wall of the upper cylindrical portion 31, and the seal between the main column 1 and the sub-column 3 can be enhanced.
The piston 2 comprises an outer ring 21, an annular connecting part 22 and an inner ring 23, wherein the outer ring 21, the annular connecting part 22 and the inner ring 23 are integrally manufactured; the upper end of the inner ring 23 is provided with a second annular end surface 231, and the second annular end surface 231 is matched with the first annular end surface 12; an inner limiting ring 232 is arranged on the inner side of the inner ring 23, and the inner side wall of the inner limiting ring 232 is in close contact with the outer side wall of the upper cylindrical part 31; the lower end of the inner ring 23 is fitted with a first annular groove 35. The outer side wall of the outer ring 21 is closely contacted with the inner side wall of the pump body 6 of the emulsion pump. When the press head 4 is pressed, the piston 2 rises to a high position, at the moment, the second annular end face 231 at the upper end of the inner ring 23 is in sealing fit with the first annular end face 12 at the lower end of the main column 1, so that the sealing between the piston 2 and the main column 1 can be enhanced, and the inner side wall of the inner limiting ring 232 is in sealing fit with the outer side wall of the upper cylindrical part 31, so that the sealing between the piston 2 and the auxiliary column 3 can be enhanced, emulsion in the lower cavity of the pump body 6 can smoothly enter the first flow channel 36, and the emulsion is prevented from leaking to the upper cavity; when the press head 4 is released, the piston 2 descends to a low position, at the moment, the second annular end face 231 at the upper end of the inner ring 23 is separated from the first annular end face 12 at the lower end of the main column 1, the lower end of the inner ring 23 is in sealing fit with the first annular groove 35 at the lower part of the auxiliary column 3, the inner side wall of the inner limiting ring 232 is in sealing fit with the outer side wall of the upper cylindrical part 31, and the sealing between the piston 2 and the auxiliary column 3 can be enhanced.
The lower end of the inner limiting ring 232 is provided with a third annular end surface 233, the upper end of the middle cylinder part 32 is provided with a fourth annular end surface 322, and the fourth annular end surface 322 is matched with the third annular end surface 233. When the piston 2 rises to the high position, the third annular end surface 233 at the lower end of the inner retainer ring 232 is separated from the fourth annular end surface 322 at the upper end of the middle cylinder part 32; when the piston 2 descends to the low position, the third annular end surface 233 at the lower end of the inner limiting ring 232 is in sealing fit with the fourth annular end surface 322 at the upper end of the middle cylinder part 32, and the sealing between the piston 2 and the auxiliary column 3 can be enhanced.
When the product packaged by the packaging bottle is in an unused state, the plastic spring 7 is in an extension state (with small pressure) and is positioned between the press head 4 and the lock cover 9; since the inner side wall of the piston 2 is in close contact with the outer side wall of the sub-column 3, the outer side wall of the piston 2 is in close contact with the inner side wall of the pump body 6, and the check valve 7 at the bottom of the pump body 6 seals the liquid inlet 61, the cavity of the pump body 6 above the check valve 7 is in a closed state, and at this time, no emulsion exists in the third flow passage 41, the second flow passage 11 and the first flow passage 36. The upper end surface of the upper cylindrical portion 31 is in sealing engagement with the first annular end surface 12 at the lower end of the main column 1, thereby enhancing the seal between the main column 1 and the sub-column 3. The button 4 is tightly buckled with the main column 1, the connection is very firm, and even if the button 4 is directly lifted by hands, the button 4 can not be separated from the whole bottle of emulsion.
The piston 2 has two working positions, namely a rising position and a falling position: when the press head 4 is pressed, the piston 2 rises to a high position, at the moment, the upper end of the piston 2 is in sealing fit with the first annular end face 12 at the lower end of the main column 1, the sealing between the piston 2 and the main column 1 can be enhanced, the lower end of the piston 2 is separated from the first annular groove 35 of the auxiliary column 3, and the liquid inlet hole 321 of the first flow channel 36 is opened, so that the liquid inlet hole 321 is communicated with the cavity of the pump body 6, and emulsion in the cavity at the lower part of the pump body 6 can smoothly enter the first flow channel 36; when the press head 4 is released, the piston 2 descends to a low position, the upper end of the piston 2 is separated from the first annular end face 12 at the lower end of the main column 1, the lower end of the piston 2 is in sealing fit with the first annular groove 35 of the auxiliary column 3, the sealing between the piston 2 and the auxiliary column 3 can be enhanced, and the liquid inlet hole 321 of the first flow passage 36 is separated from the cavity of the pump body 6, so that negative pressure can be generated in the lower cavity of the pump body 6.
When the piston is used, the press head 4 is pressed downwards, the piston assembly moves downwards along the inner side wall of the pump body 6, the plastic spring 7 is compressed at the moment, the piston 2 rises to a high position, and the liquid inlet hole 321 is opened; because the piston assembly is in sealing fit with the pump body 6, the check valve 7 at the bottom of the pump body 6 is pressurized by the emulsion to seal the liquid inlet 61, the emulsion cannot flow back, and the emulsion in the cavity of the pump body 6 can only flow out from the liquid inlet hole 321 in the auxiliary column 3, the first flow passage 36, the second flow passage 11 in the main column 1 and the third flow passage 41 in the press head 4 in sequence. When the press head 4 is released, the press head 4 and the piston assembly rise and reset under the action of the plastic spring 7, the piston 2 descends to a low position and closes the liquid inlet hole 321, negative pressure is generated in the cavity of the pump body 6 in the rising process of the press head 4 and the piston assembly, the check valve 7 at the bottom of the pump body 6 is opened, and emulsion in the packaging bottle enters the cavity of the pump body 6 through the liquid inlet 61.
The piston assembly of the emulsion pump does not need to be provided with the check valve 7 at the top of the main column 1, and can play the role of the check valve 7 only by utilizing the matching among the piston 2, the auxiliary column 3 and the liquid inlet hole 321, so that the emulsion in the cavity at the lower part of the pump body 6 flows to the first flow channel 36 from the liquid inlet hole 321, the structure is simpler, the matching mode of the piston assembly is changed, the processing is simple and convenient, and the production cost is favorably reduced.
In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (4)
1. A piston assembly of an emulsion pump comprises a main column, a piston and an auxiliary column, wherein the upper end of the auxiliary column is connected with the lower end of the main column, the piston is annular and is sleeved on the auxiliary column, and the inner side wall of the piston is tightly contacted with the outer side wall of the auxiliary column; a first flow passage is arranged in the auxiliary column, a second flow passage which runs up and down is arranged in the main column, and the second flow passage is communicated with the first flow passage; the method is characterized in that: the lower end of the main column is provided with a first annular end face; the auxiliary column comprises an upper cylindrical part, a middle cylindrical part, a sealing sheet and a circular truncated cone-shaped lower limiting part with a small upper part and a large lower part, and the upper cylindrical part, the middle cylindrical part, the sealing sheet and the circular truncated cone-shaped lower limiting part are integrally manufactured; the upper cylindrical part is sleeved on the lower end of the main column, and the upper end surface of the upper cylindrical part is in close contact with the first annular end surface; the sealing piece is arranged at the lower end of the middle cylinder part and seals the lower end of the middle cylinder part, at least one liquid inlet hole is arranged on the side wall of the middle cylinder part, and the liquid inlet hole is communicated with the first flow channel; the lower end of the circular truncated cone-shaped lower limiting part is provided with a first annular groove with an upward opening, and the piston is located between the first annular end face and the first annular groove.
2. A lotion pump piston assembly according to claim 1, wherein: the lower end of the main column is positioned in the inner cavity of the upper cylindrical part, and the outer side wall of the main column is in close contact with the inner side wall of the upper cylindrical part.
3. A lotion pump piston assembly according to claim 1, wherein: the piston comprises an outer ring, an annular connecting part and an inner ring, and the outer ring, the annular connecting part and the inner ring are integrally manufactured; the upper end of the inner ring is provided with a second annular end surface which is matched with the first annular end surface; an inner limiting ring is arranged on the inner side of the inner ring, and the inner side wall of the inner limiting ring is in close contact with the outer side wall of the upper cylindrical part; the lower end of the inner ring is matched with the first annular groove.
4. A lotion pump piston assembly according to claim 3, wherein: the lower extreme of interior spacing ring is equipped with third annular terminal surface, the upper end of well drum portion is equipped with fourth annular terminal surface, and fourth annular terminal surface cooperatees with third annular terminal surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020212730.9U CN211845602U (en) | 2020-02-26 | 2020-02-26 | Piston assembly of emulsion pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020212730.9U CN211845602U (en) | 2020-02-26 | 2020-02-26 | Piston assembly of emulsion pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211845602U true CN211845602U (en) | 2020-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020212730.9U Active CN211845602U (en) | 2020-02-26 | 2020-02-26 | Piston assembly of emulsion pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211845602U (en) |
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2020
- 2020-02-26 CN CN202020212730.9U patent/CN211845602U/en active Active
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