CN111457105A - Engine and water drain valve preventing over-screwing - Google Patents

Engine and water drain valve preventing over-screwing Download PDF

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Publication number
CN111457105A
CN111457105A CN202010424414.2A CN202010424414A CN111457105A CN 111457105 A CN111457105 A CN 111457105A CN 202010424414 A CN202010424414 A CN 202010424414A CN 111457105 A CN111457105 A CN 111457105A
Authority
CN
China
Prior art keywords
valve
valve body
sealing washer
valve core
over
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202010424414.2A
Other languages
Chinese (zh)
Inventor
张杰坤
费运嘉
邵志新
马丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Hualing Automobile Co Ltd
Original Assignee
Anhui Hualing Automobile Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Hualing Automobile Co Ltd filed Critical Anhui Hualing Automobile Co Ltd
Priority to CN202010424414.2A priority Critical patent/CN111457105A/en
Publication of CN111457105A publication Critical patent/CN111457105A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F16K1/04—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle with a cut-off member rigid with the spindle, e.g. main valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sliding Valves (AREA)

Abstract

The invention discloses a water drain valve capable of preventing over-screwing, which comprises: the valve comprises a valve body, a valve core in threaded connection with the valve body and a sealing washer; the sealing washer is arranged between the valve core and the valve body and is used for sealing the flow channel in the valve body; one of the valve body and the valve core is provided with a limiting structure for avoiding over-screwing of the valve body and the valve core, and the other is provided with a limiting surface for matching with the limiting structure. In the process of screwing the valve core relative to the valve body, due to the arrangement of the limiting structure, the distance of screwing the valve core inwards relative to the valve body along the axial direction can be limited, the valve core is effectively prevented from being screwed up relative to the valve body, the water drain valve is prevented from being damaged due to over screwing, the service life of the water drain valve is prolonged, and meanwhile, the maintenance cost can also be reduced. The invention also discloses an engine comprising the water drain valve for preventing over-tightening.

Description

Engine and water drain valve preventing over-screwing
Technical Field
The invention relates to the technical field of mechanical equipment, in particular to a water drain valve capable of preventing over-screwing. In addition, the invention also provides an engine comprising the water drain valve for preventing over-tightening.
Background
Most engines at present adopt a cooling mode of closed forced water circulation to cool the engines, and the water cooling system is simple in structure, good in cooling effect and low in cost. In an engine using a water cooling system, when the cooling system is disassembled and maintained, the coolant in the cooling system flows out, so that a water drain valve which can discharge the coolant in advance before the cooling system is disassembled and assembled needs to be installed on the engine. The water drain valve needs to have reliable sealing capability when the engine runs, and avoids leakage of engine coolant.
A customer needs to screw or loosen the water drain valve when maintaining an engine, violent operation which does not meet assembly requirements may exist in the operation process, the water drain valve structure in the prior art is shown in figure 1 and comprises a handle, a valve core, a valve body, a rubber ring, a compression nut 01, a gasket 02, a sealing ring 03 and other structures, and in the screwing process, if excessive force is exerted, threaded connection between the valve core and the valve body fails, so that the water drain valve is damaged.
In summary, it is an urgent need to solve the problem of providing a water discharge valve capable of avoiding damage during a violent tightening process.
Disclosure of Invention
In view of this, the present invention provides a drain valve, which is provided with a limiting structure for preventing over-tightening of a valve body and a valve core, so as to prevent the drain valve from being damaged in a violent tightening process, and improve the service life of the drain valve.
It is another object of the present invention to provide an engine including the above-described over-tightening prevention drain valve.
In order to achieve the above purpose, the invention provides the following technical scheme:
an overtightening-preventing drain valve comprising: the valve comprises a valve body, a valve core and a sealing washer, wherein the valve core is in threaded connection with the valve body; the sealing washer is arranged between the valve core and the valve body and is used for sealing a flow passage in the valve body;
one of the valve body and the valve core is provided with a limiting structure for preventing the valve body and the valve core from being over-screwed, and the other one of the valve body and the valve core is provided with a limiting surface matched with the limiting structure.
Preferably, the limiting structure is a limiting protrusion arranged on the periphery of the valve core, and the protruding direction of the limiting protrusion is along the radial direction of the valve core.
Preferably, the sealing washer is attached to the opening of the flow channel and is in a compressed state when the limiting protrusion is attached to the limiting surface.
Preferably, the cross section of the sealing washer is of an annular structure, the valve core is provided with a convex column for mounting the sealing washer, and the sealing washer is sleeved on the periphery of the convex column and can rotate relative to the convex column.
Preferably, the valve body is provided with a step cavity for providing a radial expansion space for the sealing washer, the step cavity is communicated with the flow channel, and the sealing washer is attached to the inner end face of the step cavity in a sealing state.
Preferably, the step cavity is a cylindrical cavity, and the central axis of the step cavity and the central axis of the sealing washer are coincided with the central axis of the flow channel.
Preferably, the dimension of the step cavity in the axial direction thereof is larger than the thickness of the sealing gasket in the axial direction.
An engine comprises an engine body and the over-tightening prevention drain valve, wherein the over-tightening prevention drain valve is arranged on the engine body.
Preferably, the valve body is provided with external taper threads for connection with a cylinder block water channel.
The invention provides a water drain valve capable of preventing over-screwing, which comprises: the valve comprises a valve body, a valve core in threaded connection with the valve body and a sealing washer; the sealing washer is arranged between the valve core and the valve body and is used for sealing the flow channel in the valve body; one of the valve body and the valve core is provided with a limiting structure for avoiding over-screwing of the valve body and the valve core, and the other is provided with a limiting surface for matching with the limiting structure.
When the flow passage in the valve body needs to be sealed, the valve core can be screwed down relative to the valve body and tightly press the sealing washer so that the sealing washer is attached to the end face of the opening of the flow passage, and the flow passage is sealed.
In the process of screwing the valve core relative to the valve body, due to the arrangement of the limiting structure, the distance of screwing the valve core inwards relative to the valve body along the axial direction can be limited, the valve core is effectively prevented from being screwed up relative to the valve body, the water drain valve is prevented from being damaged due to over screwing, the service life of the water drain valve is prolonged, and meanwhile, the maintenance cost can also be reduced.
In addition, the invention also provides an engine comprising the water drain valve for preventing over-tightening.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic partial cross-sectional view of a prior art drain valve;
FIG. 2 is an exploded view of an embodiment of a discharge valve of the present invention that prevents over-tightening;
FIG. 3 is a schematic view of the anti-over-tightened discharge valve of FIG. 2 in a discharge state;
FIG. 4 is a schematic view of the anti-over-tightened discharge valve of FIG. 2 in a sealed state;
fig. 5 is a schematic structural view illustrating a limiting state of a limiting protrusion of the over-tightening prevention drain valve in fig. 2.
In FIGS. 1-5:
the valve comprises a nut 01, a gasket 02, a sealing ring 03, a valve body 1, a flow channel 11, a step cavity 12, an outer conical thread 13, a valve core 2, a convex column 21, a sealing washer 3, a handle 4 and a limiting bulge 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide the water drain valve capable of preventing over-screwing, so that the water drain valve can be prevented from being damaged during violent screwing, and the maintenance cost is reduced. It is another core of the present invention to provide an engine including the above-described over-tightening prevention drain valve.
Referring to fig. 1-5, fig. 1 is a schematic partial cross-sectional view of a drain valve in the prior art; FIG. 2 is an exploded view of an embodiment of a discharge valve of the present invention that prevents over-tightening; FIG. 3 is a schematic view of the anti-over-tightened discharge valve of FIG. 2 in a discharge state; FIG. 4 is a schematic view of the anti-over-tightened discharge valve of FIG. 2 in a sealed state; fig. 5 is a schematic structural view illustrating a limiting state of a limiting protrusion of the over-tightening prevention drain valve in fig. 2.
The water drain valve of this embodiment for preventing screw up that this concrete embodiment provided includes: the valve comprises a valve body 1, a valve core 2 in threaded connection with the valve body 1 and a sealing washer 3; the sealing washer 3 is arranged between the valve core 2 and the valve body 1 and is used for sealing the flow channel 11 in the valve body 1; one of the valve body 1 and the valve core 2 is provided with a limiting structure for avoiding the over-screwing of the valve body 1 and the valve core 2, and the other is provided with a limiting surface for matching with the limiting structure.
In the process of using the waterproof valve for preventing over-tightening provided by the embodiment, when liquid needs to be discharged, the valve core 2 needs to be loosened relative to the valve body 1 to enable the liquid to flow out of the flow passage 11, and when the flow passage 11 in the valve body 1 needs to be sealed, the valve core 2 can be tightened relative to the valve body 1 to press the sealing washer 3, so that the sealing washer 3 is attached to the end face of the opening of the flow passage 11, and the flow passage 11 is sealed.
Note that, the flow passage 11 mentioned in this document is a flow passage 11 provided in the valve body 1 and communicating with the cylinder block water passage.
The limiting structure can be a convex structure arranged on the valve core 2, and after the valve core 2 is screwed inwards for a certain distance relative to the valve body 1, the limiting structure is in contact with the outer side end face of the valve body 1 and is made of a rigid material, so that the valve core 2 and the valve body 1 can be effectively prevented from being screwed too tightly; of course, the limiting structure may be a structure disposed inside the valve body 1, and after the valve core 2 is screwed to a certain position, the valve core 2 contacts with the limiting structure, so as to prevent the valve core 2 from being further screwed inwards, thereby preventing over-screwing. As shown in fig. 3, the inward tightening means that the valve body 2 is screwed to the left side by rotating relative to the valve body 1, and the outer end surface of the valve body 1 means the end surface on the right side in the axial direction of the valve body 1.
In-process screwing up case 2 for valve body 1, because limit structure's setting, can restrict case 2 for valve body 1 along the axial distance of screwing up inwards, effectively avoid case 2 for valve body 1 cross screwing up to avoid the valve that drains to cause the damage because of cross screwing up, prolong the life of the valve that drains, also can avoid the dismantlement repeatedly of the valve that drains simultaneously, reduce cost of maintenance.
In addition to the above-described embodiment, the limiting structure may be a limiting protrusion 5 disposed on the periphery of the valve element 2, and the protrusion direction of the limiting protrusion 5 is along the radial direction of the valve element 2.
As shown in fig. 4 and 5, the limiting protrusion 5 is disposed at one end of the valve core 2 where the handle 4 is installed, the valve core 2 is provided with a through hole for installing the handle 4, and the limiting protrusion 5 is disposed along the circumferential direction of the valve core 2.
Preferably, the limiting protrusion 5 is circular, and the diameter of the outer ring of the limiting protrusion 5 is larger than the diameter of the thread connected between the valve core 2 and the valve body 1.
Preferably, the limiting protrusion 5 is disposed at one end of the valve core 2 away from the valve body 1 along the axial direction thereof.
The limiting bulge 5 is arranged on the valve core 2, the peripheral part of the valve core 2 can be machined, the machining process is convenient and easy to implement, and the distance between the limiting bulge 5 and the limiting surface can be visually observed in the process of screwing the valve core 2, so that the screwing process is smoother.
On the basis of the embodiment, the sealing washer 3 can be attached to the opening of the flow channel 11 and the sealing washer 3 is in a compressed state under the condition that the limiting protrusion 5 is attached to the limiting surface.
When the valve core 2 and the valve body 1 are required to be screwed down in normal installation, the limiting bulge 5 is not required to be in contact with the limiting surface, the valve core 2 can be screwed down under the condition that a certain gap is formed between the limiting bulge 5 and the limiting surface, when the sealing washer 3 is worn due to transitional use, the sealing of the flow channel 11 in the valve body 1 can be realized only by increasing the compression amount of the sealing coil, and the valve core 2 can be screwed further inwards at the moment until the limiting bulge 5 is in contact with the limiting surface, so that the sealing washer 3 can be continuously used.
Preferably, when the over-screwed water drain valve is normally screwed according to the assembly requirement, the sectional view state of the internal flow channel 11 is as shown in fig. 4, the sealing washer 3 is compressed by 1mm in the compression thickness direction, the water drain valve is not limited, when the over-screwed water drain valve is normally screwed according to the non-assembly requirement, the sectional view state of the internal flow channel 11 is as shown in fig. 5, and the sealing washer 3 is compressed by 2mm in the compression thickness direction, of course, the specific compression amount of the sealing washer 3 can be adjusted according to different actual conditions, and is specifically determined according to the actual conditions.
On the basis of the above embodiment, in order to facilitate installation of the sealing gasket 3, the cross section of the sealing gasket 3 may be set to be an annular structure, the valve core 2 is provided with a convex column 21 for installing the sealing gasket 3, and the sealing gasket 3 is sleeved on the outer periphery of the convex column 21 and is rotatably arranged relative to the convex column 21.
In the use process, when the valve core 2 is screwed or loosened relative to the valve body 1, the sealing washer 3 can be rotatably arranged relative to the valve core 2, so that the friction between the peripheral surface of the sealing washer 3 and the valve body 1 can be avoided, and the service life of the sealing washer 3 is prolonged.
Preferably, a step for preventing the sealing washer 3 from falling off may be provided at the end of the convex pillar 21, and the diameter of the step is smaller than or equal to the diameter of the flow channel 11.
On the basis of the above embodiment, in order to enable the sealing gasket 3 to have a sufficient radial expansion space in the compression process, a step cavity 12 for providing a radial expansion space for the sealing gasket 3 may be arranged on the valve body 1, the step cavity 12 is communicated with the flow passage 11, and in a sealed state, the sealing gasket 3 is attached to the inner end surface of the step cavity 12.
As shown in fig. 2, the radial dimension of the step cavity 12 is greater than that of the sealing gasket 3, and when the sealing gasket 3 is compressed in the thickness direction, the radial dimension is increased, and the step cavity 12 can provide enough space for radial expansion of the sealing gasket 3, so that damage to the sealing gasket 3 due to excessive compression is avoided, and the service life of the sealing gasket 3 is prolonged.
Preferably, the step cavity 12 may be a cylindrical cavity, and a central axis of the step cavity 12 and a central axis of the sealing gasket 3 are both coincident with a central axis of the flow channel 11.
The central axis of step chamber 12 coincides with the central axis of runner 11, can make seal ring 3 at the in-process of compressed, and radial inflation is more even, avoids the deformation because of the atress is uneven and leads to guarantee sealed effect.
The dimension of the step chamber 12 in the axial direction thereof can be made larger than the thickness of the sealing gasket 3 in the axial direction.
In the use process, because the dimension of the step cavity 12 along the axial direction is larger than the thickness of the sealing washer 3 along the axial direction, and the thickness of the sealing washer 3 along the axial direction is larger than the thickness of the sealing washer 3, the sealing washer 3 can have enough expansion space in the radial direction when being extruded, the phenomenon that the radial direction cannot expand due to the limitation of the space when being extruded in the thickness direction is avoided, the damage rate of the sealing washer 3 is reduced, and the service life of the sealing washer is prolonged.
In addition to the above over-tightening prevention drain valve, the present invention also provides an engine including the over-tightening prevention drain valve disclosed in the above embodiment, the engine including an engine body and any one of the above-mentioned over-tightening prevention drain valves, and the over-tightening prevention drain valve being provided to the engine body; the structure of other parts of the engine is referred to the prior art, and is not described herein.
The water drain valve capable of preventing over screwing is arranged on the engine, when the cooling system is disassembled and assembled, the valve core 2 can be unscrewed, cooling liquid flows out, when the valve core 2 needs to be screwed, the valve core 2 can be screwed to enable the sealing washer 3 to seal the flow channel 11, the probability that the water drain valve is damaged due to improper maintenance operation is reduced, the water drain valve can be prevented from being frequently replaced, and the maintenance cost is reduced.
On the basis of the above-described embodiment, the valve body 1 may be provided with an external tapered thread 13 for connection with a cylinder water passage of an engine.
In the connection process, the outer cone threads 13 are connected with the inner cone threads matched with the outer cone threads, the arrangement mode of the nuts 01, the gaskets 02 and the sealing rings 03 in the original structure is replaced by the connection mode of the cone threads, the number of parts is reduced, and the connection structure between the water drain valve and the cylinder water channel is simple and reliable in sealing effect. The connection mode reduces the number of parts such as the gasket 02 and the compression nut 01, reduces the number of parts of the water drain valve, and simplifies the structure of the water drain valve.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. Any combination of all embodiments provided by the present invention is within the scope of the present invention, and will not be described herein.
The engine and the water drain valve for preventing over-tightening provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (9)

1. An overtightening prevention drain valve, comprising: the valve comprises a valve body (1), a valve core (2) and a sealing washer (3), wherein the valve core (2) is in threaded connection with the valve body (1); the sealing washer (3) is arranged between the valve core (2) and the valve body (1) and is used for sealing a flow channel (11) in the valve body (1);
one of the valve body (1) and the valve core (2) is provided with a limiting structure for preventing the valve body (1) and the valve core (2) from being over-screwed, and the other is provided with a limiting surface for being matched with the limiting structure.
2. The over-tightening prevention drain valve according to claim 1, wherein the limiting structure is a limiting protrusion (5) arranged on the periphery of the valve core (2), and the protrusion direction of the limiting protrusion (5) is along the radial direction of the valve core (2).
3. The anti-over-tightening water drain valve according to claim 2, wherein the sealing washer (3) is attached to the opening of the flow passage (11) and the sealing washer (3) is in a compressed state when the limiting protrusion (5) is attached to the limiting surface.
4. The anti-over-tightening water drain valve according to claim 3, wherein the cross section of the sealing washer (3) is of an annular structure, the valve core (2) is provided with a convex column (21) for installing the sealing washer (3), and the sealing washer (3) is sleeved on the outer periphery of the convex column (21) and is rotatably arranged relative to the convex column (21).
5. The overtightening prevention drain valve according to claim 1, wherein the valve body (1) is provided with a step cavity (12) for providing a radial expansion space for the sealing gasket (3), the step cavity (12) is communicated with the flow passage (11), and the sealing gasket (3) is attached to an inner end surface of the step cavity (12) in a sealing state.
6. The overtightening prevention drain valve according to claim 5, wherein the step cavity (12) is a cylindrical cavity, and the central axis of the step cavity (12) and the central axis of the sealing washer (3) are coincident with the central axis of the flow passage (11).
7. Overtightening-preventing bleeder valve according to claim 5, characterized in that the dimension of the step chamber (12) in its axial direction is greater than the thickness of the sealing washer (3) in the axial direction.
8. An engine comprising an engine block and the over-tightening prevention drain valve of any one of claims 1 to 7, wherein the over-tightening prevention drain valve is disposed in the engine block.
9. Overtightening-preventing bleeder valve according to claim 8, characterized in that the valve body (1) is provided with an external conical thread (13) for connection with the cylinder block water channel.
CN202010424414.2A 2020-05-19 2020-05-19 Engine and water drain valve preventing over-screwing Withdrawn CN111457105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010424414.2A CN111457105A (en) 2020-05-19 2020-05-19 Engine and water drain valve preventing over-screwing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010424414.2A CN111457105A (en) 2020-05-19 2020-05-19 Engine and water drain valve preventing over-screwing

Publications (1)

Publication Number Publication Date
CN111457105A true CN111457105A (en) 2020-07-28

Family

ID=71677896

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010424414.2A Withdrawn CN111457105A (en) 2020-05-19 2020-05-19 Engine and water drain valve preventing over-screwing

Country Status (1)

Country Link
CN (1) CN111457105A (en)

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Application publication date: 20200728

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