CN202451264U - Constant temperature water tank structure for diesel engine - Google Patents

Abstract

The utility model discloses a constant temperature water tank structure for a diesel engine. The constant temperature water tank structure comprises a constant temperature water tank body, the constant temperature water tank body is provided with a plane which is fixedly connected with an auxiliary supporting box of the diesel engine, a high temperature water backflow port and a low temperature water backflow port are arranged on the plane and communicated with a high temperature backwater port and a low temperature backwater port respectively, and the high temperature backwater port and the low temperature backwater port are enduced from the inside of the whole diesel engine on the auxiliary supporting box of the diesel engine; and three layers of hollow structures are respectively formed in the high temperature water circulation area and the low temperature water circulation area in the constant temperature water tank body, thermostatic valves arranged in the three layers of hollow structures are used for adjusting flow directions of cooling water, single and double circulation of the cooling water in the constant temperature water tank body between the high temperature water circulation area and the low temperature water circulation area can be flexibly converted through an arc cover or a panel cover plate and screw plugs, and the screw plugs are arranged in screw holes which are used for communicating the hollow structures in the high temperature water circulation area and the low temperature water circulation area. The constant temperature water tank structure for the diesel engine is independent of the auxiliary supporting box, casting and processing difficulties and the rejection rate are reduced, the integrated level is high, auxiliary pipelines are few, the assembly technique is simplified, and the constant temperature water tank structure is convenient to repair, check and install when faults are found.

Description

A kind of diesel engine constant temperature water tank structure

Technical field

The utility model relates to the constant temperature technology field, is the constant temperature water tank structure that is used for diesel engine specifically, also belongs to Diesel Engine Technique Field simultaneously.

Background technique

Auxiliary system structures such as the oil circuit of at present domestic main flow marine diesel motor, water route are too fat to move numerous and diverse; Three channel interfaces of cooling water circulating temperature adjusting color controls all need the external application pipeline to connect, cooperate; Promptly all need external pipe at cool cycles water inlet, high temperature circulation water out and cool cycles water out; This mode piping layout need take very large space, and structure is not compact.Assembly technology is complicated; And constant temperature water tank that has in the external marine diesel engine structure and aiding support case or constant temperature water tank and high and low temperature water pump are structure as a whole, and exist casing big, requirement on machining accuracy height and assembly and disassembly difficulty, defectives such as maintaining inconvenience and cost height.

Simultaneously, aspect adaptability, exist the conversion of the single, double circuit of cooling water dumb, promptly as machine peculiar to vessel and land with machine can not dual use of while a difficult problem.

Summary of the invention

To above-mentioned deficiency of the prior art; The utility model aims to provide a kind of diesel engine constant temperature water tank structure; It is independent that it carries out the circulation function module from the integrated auxiliary system of diesel engine, makes the casting of this diesel engine constant temperature water tank and difficulty of processing reduce, and improved machining accuracy; Simplify assembly technology, made things convenient for the later stage operation and maintenance to change.

The technological scheme of the utility model: a kind of diesel engine constant temperature water tank structure; Comprise the constant temperature water tank casing; Has the plane that is connected mutually with diesel engine aiding support case on this constant temperature water tank casing; Have high and low warm water refluxing opening on this plane, its respectively with aforementioned diesel engine aiding support case on the high and low temperature backwater mouth of drawing from whole diesel engines be connected.

Through constant temperature water tank is decomposited independent part from traditional aiding support case, this constant temperature water tank through with the aiding support case between the face face seal be connected, realize the refrigerating function of whole diesel engine system.Constant temperature water tank and aiding support packing list be casting and processing solely, makes whole casting and difficulty of processing significantly reduce, and has reduced waste product productivity; And face face bolt seals is connected between this constant temperature water tank and the aiding support case; Level of integration is high, has simplified assembly technology, is convenient to maintenance.

Further, said constant temperature water tank casing is separated into high-temperature water race way and low temperature water race way through a partition, and said high and low warm water refluxing opening correspondence respectively is arranged on the said high and low temperature water cycle zone.

On the said high and low temperature water cycle zone also respectively correspondence have the high and low temperature water out, high and low temperature water inlet and high and low warm water drain opening.

All have in the said high and low temperature water cycle zone down, in, on totally three layers of independent hollow structure; Wherein have the thermostatic valve that runs through said three layers of hollow structure respectively in this high and low temperature water cycle zone, the corresponding lower floor's hollow structure with this high and low temperature water cycle zone of said high and low warm water refluxing opening is connected.

Thermostatic valve on the said high and low temperature water cycle zone is three.

Said thermostatic valve comprises main body, temperature sense piece and movable block; An end that has the temperature sense piece on this thermostatic valve is in lower floor's hollow structure in said high and low temperature water cycle zone, and the position relation between said movable block and the main body is regulated through said temperature sense piece induction.

Said high and low temperature water out and high and low temperature water inlet all are built up on the opposite on aforementioned plane, and the upper strata hollow structure in its corresponding and said respectively high and low temperature water cycle zone is connected.

The middle level hollow structure in the corresponding and said high and low temperature water cycle of said high and low warm water drain opening zone is connected.

Further, in said constant temperature water tank casing, also have the through hole that is communicated with said low temperature water race way lower floor hollow structure to upper strata, said high-temperature water race way hollow structure.

On the corresponding middle level hollow structure in said high and low temperature water cycle zone, be equipped with water passage hole, and be provided with through an arc cover cap or the sealing of plane cover plate above that.

Preferably, said through hole is a screw.

In the use,, high and low temperature water cycle set of regions is formed in this constant temperature water tank structure when the engine interior cooling water is two when recycling; On said water passage hole, be provided with through a plane cover plate sealing; Make the middle level hollow structure in the high and low temperature water cycle zone separate, and on said through hole, a plug screw is installed, the upper strata hollow structure of high-temperature water race way and lower floor's hollow structure of low temperature water race way are separated; At this moment, whole constant temperature water tank structure forms binary cycle system.

Described binary cycle system; Promptly being high-temperature cooling water enters into the upper strata hollow structure of this constant temperature water tank casing from the high-temperature water inlet, and is flowed out by the high-temperature water outlet, connects the high temperature water pump and enters to diesel engine work system and carry out the high-temperature water cooling; Last cooling water is back to lower floor's hollow structure of this constant temperature water tank casing from the high-temperature water refluxing opening; Judge that through thermostatic valve when cooling water temperature was lower than the sensor block temperature sensor, cooling water flow to upper strata hollow structure continuation circulation from lower floor's hollow structure and cools off for diesel engine work system; When cooling water temperature is higher than the sensor block temperature sensor; Cooling water flow to the middle level hollow structure from lower floor's hollow structure, and discharges from the high-temperature water drain opening, and the high-temperature cooling water of whole cooling system is replenished from the high-temperature water inlet once more; Low-temperature cooling water enters the mouth from low temperature water and enters into the upper strata hollow structure of this constant temperature water tank casing; And by low temperature water outlet outflow; Connect low temperature water pump and enter to diesel engine work system and carry out low temperature water cooling, last cooling water is back to lower floor's hollow structure of this constant temperature water tank casing from the low temperature water refluxing opening, judges through thermostatic valve; When cooling water temperature is lower than the sensor block temperature sensor; Cooling water flow to upper strata hollow structure continuation circulation from lower floor's hollow structure and cools off for diesel engine work system, and when cooling water temperature was higher than the sensor block temperature sensor, cooling water flow to the middle level hollow structure from lower floor's hollow structure; And from the discharge of low temperature water drain opening, the low-temperature cooling water of whole cooling system is replenished from the low temperature water inlet once more.

When engine interior cooling water single cycle is used; With high-temperature water inlet and the sealing of high-temperature water drain opening; Take off plug screw, make that the upper strata hollow structure of high-temperature water race way is identical with lower floor's hollow structure of low temperature water race way, and said plane cover plate is replaced by arc cover cap; Make two middle level hollow structures in the high and low temperature water cycle zone communicate, promptly form single loop system.

Described single loop system; Promptly being low-temperature cooling water enters into the upper strata hollow structure of this constant temperature water tank casing from the low temperature water inlet, flows out via the low temperature water outlet, meets low temperature water pump to diesel engine work system and carries out low temperature refrigeration; Last cooling water is back in lower floor's hollow structure of this constant temperature water tank casing by the low temperature water refluxing opening; Judged that by thermostatic valve a part of cooling water enters to the upper strata hollow structure continuation circulation of low temperature water race way and carries out low temperature refrigeration for diesel engine work system, another part cooling water is entered to the upper strata hollow structure of high-temperature water race way by through hole; Flow out by the high-temperature water outlet then; Meet high temperature water pump to diesel engine work system and carry out high temperature cooling, last cooling water is back to lower floor's hollow structure of high-temperature water race way by the high-temperature water refluxing opening, is judged by the thermostatic valve in the high-temperature water race way again; Part water enters to the upper strata hollow structure continuation circulation of high-temperature water race way and carries out the high temperature cooling for diesel engine work system; Another part water is the middle level hollow structure of high-temperature water race way then, again via arc cover cap, enters to the middle level hollow structure in the low temperature water race way; Discharge from the low temperature water drain opening at last, the cooling water of whole cooling system is replenished by the low temperature water inlet once more.

The utility model is through simply changing cover cap on the constant temperature water tank structure and plug screw being installed in through hole can being realized the conversion between the single, double circulation of cooling water, and is flexible.

In addition, said thermostatic valve is directly installed on the constant temperature water tank, and reliability also is improved, and can realize easily that cooling water single cycle and bicirculating freely changes, and accomplishes the cooling water of whole diesel engine cooling system is supplied with.

In whole constant temperature water tank structure, only need external intake pipe and drain opening to get final product, need not other unnecessary circuit design that exposes; Level of integration is high, and auxiliary piping is few, has simplified assembly technology; Simultaneously; External high and low temperature water pump from the constant temperature water tank structure is convenient to maintenance, and the maintenance when finding fault is all very convenient.

Description of drawings

Fig. 1 is the utility model and the schematic representation that is connected of aiding support case;

Fig. 2 is in the plan view of single cycle state for the utility model;

Fig. 3 is the rear view of Fig. 2;

Fig. 4 is the left view of Fig. 3;

Fig. 5 is along the sectional structure schematic representation of S1-S1 line among Fig. 4;

Fig. 6 is along the sectional view of S2-S2 line among Fig. 3;

Fig. 7 is in the plan view of two recurrent states for the utility model;

Fig. 8 is the rear view of Fig. 7;

Fig. 9 is the left view of Fig. 8;

Figure 10 is along the sectional structure schematic representation of S3-S3 line among Fig. 9;

Figure 11 is along the sectional view of S4-S4 line among Fig. 8;

Figure 12 is the structural representation of the thermostatic valve in the utility model;

Figure 13 is the work schematic representation of thermostatic valve among Figure 12;

Figure 14 is another working state schematic representation of the total thermostatic valve of Figure 12.

Embodiment

Come further explain the utility model below in conjunction with specific embodiment and accompanying drawing.

Referring to Fig. 1, Fig. 3 and Fig. 8; A kind of diesel engine constant temperature water tank structure; Comprise constant temperature water tank casing 1; Have the plane 4 that is connected mutually with diesel engine aiding support case 2 on this constant temperature water tank casing 1, have high and low warm water refluxing opening 201,101 on this plane 4, its respectively with aforementioned diesel engine aiding support case 2 on the high and low temperature backwater mouth of drawing from whole diesel engines be connected.

Particularly; On said constant temperature water tank casing 1 both sides, establish fixedly ear; Fixedly ear end face and said plane 4 are in the same plane; Said constant temperature water tank casing 1 is through fixedly using connection sets such as bolt or screw to be fixedly connected with said aiding support case 2 on the ear; And high and low warm water refluxing opening 201,101 on the constant temperature water tank casing 1 and the corresponding connection of high and low temperature backwater mouth on the aiding support case 2 are provided with O-ring seals simultaneously on the surface of contact of constant temperature water tank casing 1 and aiding support case 2, prevent to be communicated with between high and low warm water refluxing opening 201,101 and the corresponding high and low temperature backwater mouth phenomenon of generation cooling water leakage.Be connected with face face between the aiding support case 2 through constant temperature water tank casing 1, omitted domestic traditional pipeline and connected, make that whole design level of integration is higher; Compact structure, than the fully integratedization design between external constant temperature water tank 1 and the aiding support case 2, the advantage of the utility model: constant temperature water tank 1 and aiding support case 2 can be cast separately and process; Casting and difficulty of processing reduce; Reduce waste product productivity, simplified production, assembly technology, simultaneously; Be convenient to maintenance, it is all very convenient that the maintenance when finding fault is installed.

For the diesel engine constant temperature water tank structure in the utility model; Specifically referring to Fig. 2 to Figure 14; This constant temperature water tank casing 1 inside cuts off 120 through one and is separated into high-temperature water race way 20 and low temperature water race way 10 two-part; On this high and low temperature water cycle zone 20,10, all having three layers of independent hollow structure simultaneously, is respectively lower floor's hollow structure 21, middle level hollow structure 22 and upper strata hollow structure 23 on the high-temperature water race way 20; Lower floor's hollow structure 11 on the low temperature water race way 10, middle level hollow structure 12 and upper strata hollow structure 13.This example is preferred; Have three layers of independent hollow structure in the constant temperature water tank casing 1; Then by cut off 120 with these three layers of independent hollow structures be separated on the high-temperature water race way 20 following, in, on last three layers of hollow structure 21,22,23 and the low temperature water race way 10 following, in, last three layers of hollow structure 11,12,13, corresponding through the mutual level of three layers of hollow structure on the said high and low temperature water cycle zone 20,10, make its casting difficulty reduce; And saved the spatial position; Constant temperature water tank casing 1 set inside is compact, thereby makes that whole constant temperature water tank structure is light and handy, and is not too fat to move.

Said high and low warm water refluxing opening 201,101 correspondences are arranged on the said high and low temperature water cycle zone 20,10, specifically are that this high and low warm water refluxing opening 201,101 is communicated with said high and low temperature water cycle zone 20,10 interior corresponding lower floor hollow structures 21,11.Also has high and low temperature water inlet 204,104 on the constant temperature water tank casing 1 in the utility model; High and low temperature water out 203,103 and high and low warm water drain opening 202,102 are on its corresponding respectively high and low temperature water cycle zone 20,10 that is provided with in the said constant temperature water tank casing 1.Referring to Fig. 2, Fig. 4, Fig. 6, Fig. 7, Fig. 9 and Figure 11; Beautiful shape for whole constant temperature water tank structure; Compact structure; Middle level hollow structure 22,12 on the corresponding and said respectively high and low temperature water cycle of said high and low warm water drain opening 202,201 zone 20,10 is connected, and is preferred, and said high and low warm water drain opening 202,201 is arranged on the two ends end face of said constant temperature water tank casing 1; Upper strata hollow structure 23,13 on the corresponding and said respectively high and low temperature water cycle of said high and low temperature water inlet 204,104 and high and low temperature water out 203,103 zone 20,10 is connected; Attractive in appearance for complete machine; The conveniently connection of follow-up high and low temperature water pump; Preferably with said high and low temperature water inlet 204,104 and high and low temperature water out 203,103 respectively symmetry be located on the front of said constant temperature water tank casing 1; That is to say on the opposite on said plane 4 that the order with high-temperature water inlet 204, high-temperature water outlet 203, low temperature water outlet 103, low temperature water inlet 104 is arranged on the front of said constant temperature water tank casing 1 exactly.

In order to make said cooling water in this constant temperature water tank casing 1, can circulate; In said high and low temperature water cycle zone 20,10, have the thermostatic valve 71,72 that runs through said three layers of hollow structure respectively, this thermostatic valve 71,72 can be so that the cooling water in the said high and low temperature water cycle zone 20,10 be made shuttling movement in zone separately.

Particularly; Referring to Fig. 6, Figure 11 to Figure 14; Described thermostatic valve 71,72 includes main body 711, temperature sense piece 710 and movable block 712 respectively; An end that has temperature sense piece 710 on the thermostatic valve described in this constant temperature water tank structure 71,72 is in lower floor's hollow structure 21,11 in said high and low temperature water cycle zone 20,10; Make said temperature sense piece 710 inductions be back to the cooling water temperature in this constant temperature water tank casing 1,, confirm the relative position relation of main body 711 and movable block 712 according to the temperature sensor comparison of this temperature and this temperature sense piece 710 from high and low warm water refluxing opening 201,101; Finally determine the flow direction of cooling water, promptly the relation of the position between movable block 712 and the main body 711 is through temperature sense piece 710 induction regulating and controlling.Just when cooling water temperature was lower than temperature sense piece 710 temperature sensors, movable block 712 was attached on the main body 711, and cooling water flows to the residing hollow structure in movable block 712 ends from the hollow structure at temperature sense piece 710 places; When cooling water temperature is higher than temperature sense piece 710 temperature sensors; Movable block 712 breaks away from main body 711; Fit with the disk that is contained in the constant temperature water tank casing 1, cooling water flows to the hollow structure between main body 711 and the movable block 712 from temperature sense piece 710 residing hollow structures.

The temperature sensor of the temperature sense piece 710 of different thermostatic valves is inequality; In this example; The thermostatic valve 71,72 that is in the high and low temperature water cycle zone 20,10 is three; And the temperature sense piece 710 of the thermostatic valve 71 in the high-temperature water race way 20 and the temperature sense piece 710 of the thermostatic valve 72 in the low temperature water race way 10 are inconsistent; And in implementing utilization, can also change thermostatic valve or the temperature sensor of the temperature sense piece 710 on the replacing/change thermostatic valve in the constant temperature water tank structure as required at any time.Certainly, the utility model is not limited to three for the quantity of thermostatic valve 71,72, also can be one, two, perhaps more than three, can decide as the case may be.

Further, in said constant temperature water tank casing 1, also have the through hole 6 that is communicated with said low temperature water race way 10 lower floor's hollow structures 11 to said high-temperature water race way 20 upper strata hollow structures 23, preferably this through hole 6 is a screw.Referring to Fig. 5, Fig. 6, Figure 10 and Figure 11, said through hole 6 can be located in the said partition 120; Also can and cut off 120 and jointly said constant temperature water tank casing 1 is separated into high and low temperature water cycle zone 20,10 through through hole 6.Through hole 6 in the utility model is preferably screw; Mainly be that this through hole 6 optionally is communicated with or intercepts the cooling water in the upper strata hollow structure 23 of lower floor's hollow structure 11 of opening said low temperature water race way 10 and high-temperature water race way 20 for ease; Just can control the through and off of through hole 6 in said through hole 6 through plug screw 9 is installed, and then being communicated with and disconnection of the interior cooling water of the upper strata hollow structure of lower floor's hollow structure 11 of controlling said low temperature water race way 10 and high-temperature water race way 20 23.

Referring to Fig. 5 and Figure 10, on the middle level hollow structure 22,12 of said high and low temperature water cycle zone 20,10 correspondences, be equipped with water passage hole, and be provided with through an arc cover cap 5 or 8 sealings of plane cover plate above that.Particularly; On the middle level hollow structure 22,12 of high and low temperature water cycle zone 20,10 correspondences; On the same side of just whole constant temperature water tank casing 1, offer water passage hole, preferred; On the corresponding middle level hollow structure 22,12 in high and low temperature water cycle zone 20,10 near the position that cuts off 120; Just cut off on 120 both sides and offer water passage hole, the outer hole of this water passage hole is along being in same plane, and sealing above that is provided with an arc cover cap 5 or plane cover plate 8 all covers said water passage hole then.The effect of said arc cover cap 5 is can be so that the middle level hollow structures 22,12 in the said high and low temperature water cycle zone 20,10 are connected, and arc cover cap 5 is as connecting passage; And the effect of said plane cover plate 8 is to intercept the middle level hollow structure 22 in the said high and low temperature water cycle zone 20,10, the connection between 12.When mounted, establish seal ring between said arc cover cap 5 and plane cover plate 8 and the constant temperature water tank casing 1.

In addition; The utility model is built up in said constant temperature water tank casing 1 outside with said high and low temperature water pump; Through pipeline it is connected with high and low temperature water out 203,103 on the said constant temperature water tank casing 1; Than the external high and low temperature water pump is integrated in the constant temperature water tank casing 1; The reduction of the utility model casting and difficulty of processing, and convenient to high and low temperature water pump maintenance, need not to unload the maintenance that whole constant temperature water tank casing 1 can accomplish the high and low temperature water pump and reduced labor intensity.

When the utility model is used for that the engine interior cooling water is two to be recycled; On said water passage hole, be provided with through 8 sealings of plane cover plate; Make the middle level hollow structure 22,12 in the high and low temperature water cycle zone 20,10 separate, and on said through hole 6, a plug screw 9 is installed, the upper strata hollow structure 23 of high-temperature water race way 20 and lower floor's hollow structure 11 of low temperature water race way 10 are separated; At this moment, whole constant temperature water tank structure forms binary cycle system.

When the utility model is used for the use of engine interior cooling water single cycle; High-temperature water inlet 204 and high-temperature water drain opening 202 are sealed through cover cap 3; Take off plug screw 9, make that the upper strata hollow structure 23 of high-temperature water race way 20 is identical with lower floor's hollow structure 11 of low temperature water race way 10, and said plane cover plate 8 is replaced by arc cover cap 5; Make two middle level hollow structures 22,12 in the high and low temperature water cycle zone 20,10 communicate, promptly form single loop system.

The utility model is divided into independently two parts with constant temperature water tank casing 1 and aiding support case 2; Casting and processing separately respectively; Reduce casting and difficulty of processing; And be assembled together through being threaded, water channel utilizes O-ring seals to seal between the two, and thermostatic valve 71,72 is directly installed on the constant temperature water tank casing 1 to guarantee its reliability.Can be through changing arc cover cap 5 and plane cover plate 8; Whether add cover cap 3 in high-temperature water inlet 204 and high-temperature water drain opening 202; And whether come between the single, double circulation of cooling water, to change neatly in that plug screw 9 is installed on the through hole 6, succinctly convenient and swift.

More than technological scheme that the utility model embodiment is provided carried out detailed introduction; Used concrete example among this paper the utility model embodiment's principle and mode of execution are set forth, above embodiment's explanation only is applicable to the principle that helps to understand the utility model embodiment; Simultaneously, for one of ordinary skill in the art, according to the utility model embodiment, the part that on embodiment and application area, all can change, in sum, this description should not be construed as the restriction to the utility model.

Claims (10)

1. diesel engine constant temperature water tank structure; It is characterized in that: comprise the constant temperature water tank casing; Has the plane that is connected mutually with diesel engine aiding support case on this constant temperature water tank casing; Have high and low warm water refluxing opening on this plane, its respectively with aforementioned diesel engine aiding support case on the high and low temperature backwater mouth of drawing from whole diesel engines be connected.

2. a kind of diesel engine constant temperature water tank structure according to claim 1; It is characterized in that: said constant temperature water tank casing is separated into high-temperature water race way and low temperature water race way through a partition, and said high and low warm water refluxing opening correspondence respectively is arranged on the said high and low temperature water cycle zone.

3. a kind of diesel engine constant temperature water tank structure according to claim 2 is characterized in that: on the said high and low temperature water cycle zone also respectively correspondence have the high and low temperature water out, high and low temperature water inlet and high and low warm water drain opening.

4. according to claim 2 or 3 described a kind of diesel engine constant temperature water tank structures; It is characterized in that: all have in the said high and low temperature water cycle zone down, in, on totally three layers of independent hollow structure; Wherein have the thermostatic valve that runs through said three layers of hollow structure respectively in this high and low temperature water cycle zone, the corresponding lower floor's hollow structure with this high and low temperature water cycle zone of said high and low warm water refluxing opening is connected.

5. a kind of diesel engine constant temperature water tank structure according to claim 4 is characterized in that: the thermostatic valve on the said high and low temperature water cycle zone is three.

6. a kind of diesel engine constant temperature water tank structure according to claim 5; It is characterized in that: said thermostatic valve comprises main body, temperature sense piece and movable block; An end that has the temperature sense piece on this thermostatic valve is in lower floor's hollow structure in said high and low temperature water cycle zone, and the position relation between said movable block and the main body is regulated through said temperature sense piece induction.

7. a kind of diesel engine constant temperature water tank structure according to claim 4; It is characterized in that: said high and low temperature water out and high and low temperature water inlet all are built up on the opposite on aforementioned plane, and the upper strata hollow structure in its corresponding and said respectively high and low temperature water cycle zone is connected.

8. a kind of diesel engine constant temperature water tank structure according to claim 7 is characterized in that: the middle level hollow structure in the corresponding and said high and low temperature water cycle of said high and low warm water drain opening zone is connected.

9. a kind of diesel engine constant temperature water tank structure according to claim 8 is characterized in that: in said constant temperature water tank casing, also have the through hole that is communicated with said low temperature water race way lower floor hollow structure to upper strata, said high-temperature water race way hollow structure;

On the corresponding middle level hollow structure in said high and low temperature water cycle zone, be equipped with water passage hole, and be provided with through an arc cover cap or the sealing of plane cover plate above that.

10. a kind of diesel engine constant temperature water tank structure according to claim 9, it is characterized in that: said through hole is a screw.

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