JPH04370318A - Inlet control type thermostat - Google Patents

Abstract

PURPOSE:To prevent such a situation as an once-formed circulating passage of a radiator may be immediately blocked, by forming to the first valve body a guide cylinder which is extended from the external circumference and surrounds a heat-sensor part. CONSTITUTION:A shaft 5 which is fixed to or brought into contact with one member 3 of two members of a frame groove 1 divided by a bulkhead 2 is projected into a heat-sensor part 6 which is internally contacted with another member 4. A valve body 8 which is fitted on a valve seat 7 formed on the bulkhead 2 is integrated with the heat-sensor part 6, and a valve body 10 fitted on a valve seat 13 formed on a shaft rod 9 projecting from the heat-sensor part 6 is provided. Springs 14, 15 which press the respective valve seats 7, 13 are applied to the valve bodies 8, 10 respectively. A guide cylinder 16 which is extended from the external circumference and surrounds the heat-sensitive part 6 is formed in the valve body 8. This arrangement allows direct contact of cold water flowed out of the valve body 8 into the member 4 with the heat- sensor part 6, and such a situation is prevented as an once-formed circulating passage 18 of a radiator 17 may be immediately blocked.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention provides an inlet-controlled thermostat that is located between the engine and the radiator to maintain the cooling water at an appropriate temperature in order to adjust the temperature of the engine cooling water. Pertains to proposals for use in.

0002

[Prior Art] This type of thermostat has the following types:
There are bellows type, pellet (wax) type, bimetal type, etc., but the pellet type, which is currently widely used and which is the object of this invention, will be explained with reference to Fig. 3. A shaft d, which is fixed to one member c of a frame structure b, is installed inside the other member e of the frame structure b, and consists of a case in which a conventional solid wax and an elastic body such as synthetic rubber are enclosed. A first valve body h, which is inserted into the temperature sensing part f and sits on a valve seat g formed on the partition wall a, is formed integrally with the temperature sensing part f, and a shaft protrudes from the temperature sensing part f. A second valve body j is attached to the rod i, and between the first valve body h and the other member e, and between the second valve body j and the temperature sensing part f, respectively. It is formed by contracting springs k and l.

FIG. 4 shows a thermostat m having the above-mentioned configuration used in an outlet-controlled manner. A radiator q is disposed in the middle of a passage p with the first valve element h interposed therebetween, and the passage p is merged with the outlet side of the second valve element j to form a pump. r, and the discharge side of this pump r is communicated with the inlet passage s of the cooling water to the engine n. With such a configuration, no problem occurs because the temperature sensing portion f is controlled by hot water from the engine n.

Conventionally, the thermostat m shown in FIG. 3 has been used as it is for the inlet control type, and this case will be explained with reference to FIG. It communicates with the temperature sensing part f of the thermostat m through the passage p with the radiator q interposed therebetween, so when the thermostat m is in the closed state as shown in FIG. The hot water in the outlet passage o from the engine n communicates with the inlet side of the engine n via the open second valve body j, and there is no problem, but if the hot water opens the thermostat m, Cold water cooled by the radiator q flows into the temperature-sensing section f, cooling the temperature-sensing section f and immediately returning to the closed state.

[0005]

[Problems to be Solved by the Invention] This invention improves a pellet type thermostat so that it is suitable for inlet control. This is intended to prevent overheating by forming a circulation passage for the radiator even before warming up at high rotation speeds.

[0006]

[Means for Solving the Problems] That is, the present invention has a frame structure divided into two members by a partition wall, in which a shaft fixed to one member is inserted into a temperature sensing portion provided inside the other member. , a first valve body seated on a valve seat formed on the partition wall is integrally constructed with the temperature sensing section, and an inlet passage and an outlet for engine cooling water are provided on a shaft protruding from the temperature sensing section. A second valve body is provided which sits on a valve seat formed between the valve body and the passage, and a spring is applied to the first valve body and the second valve body to press the respective valve seats, In the first aspect of the invention, the first valve body is provided with a guide tube extending from the outer periphery of the first valve body and surrounding the temperature sensing portion. The first stage spring is loaded with a set pressure equivalent to the rotational blowing load that causes the engine to overheat, and when the first valve body reaches a certain degree of opening. act,
The second stage spring has a higher setting pressure.

[0007]

[Operation] In the invention as claimed in claim 1, the cold water flowing from the first valve body into the other member of the frame structure through the circulation passage in which the radiator is interposed is directed to the guide connected to the first valve body. Since direct contact with the temperature sensing part can be avoided by the cylinder, a situation where the circulation passage of the radiator once formed is not immediately closed will not occur. Further, in the invention of claim 2, even before warming up, when the engine is at high rotation speed, the first valve body is opened by the action of the first stage spring, and the radiator is also inserted. This ensures a circulation path.

[0008]

[Embodiment] First, in the invention shown in FIG. 1, numeral 1 is a frame structure of a thermostat, and this frame structure 1 is divided by a partition wall 2 into one member 3 and the other member 4. Part 3
A shaft 5 is fixed to or abutted against. This shaft 5 is inserted into a temperature sensing part 6 provided inside the other member 4, and this temperature sensing part 6 has a solid wax inside the case, as is customary in pellet type thermostats of this type. and an elastic body such as synthetic rubber are enclosed, and when the case is heated, the wax turns into a liquid and expands, compressing the elastic body. Therefore, it exhibits the effect of pushing out the shaft 5.

A valve seat 7 is formed on the partition wall 2,
A first valve element 8 seated on this valve seat 7 from the side of the other member 4 is integrally constructed with the temperature sensing section 6, and this temperature sensing section 6
A second valve body 10 is fitted into the shaft rod 9 that protrudes from the end opposite to the end where the valve body 8 is formed. , is seated on a valve seat 13 formed between an inlet passage 11 and an outlet passage 12 of cooling water of an engine (not shown), and a valve seat 13 is provided between the first valve body 8 and the other member 4. , a spring 14 is compressed, and a spring 14 is also provided between the temperature sensing portion 6 and the second valve body 10.
5 will be reduced.

[0010] In the above structure, in the present invention, a guide tube 16 is formed in the first valve body 8 and extends from the outer periphery thereof and surrounds the temperature sensing part 6. Accordingly, the thermostat of the present invention is connected from the engine cooling water outlet passage 12 to the thermostat inlet 1 via the circulation passage 18 with the radiator 17 interposed therebetween.
This prevents the temperature sensing section 6 from being unnecessarily cooled by the cold water supplied to the section 9. Note that a guide cylinder 16A is also formed on the second valve body 10, if necessary.

Next, in the invention shown in FIG.
This is a Mostat frame structure, and this frame structure 21 is divided into one member 23 and the other member 24 by a partition wall 22, and a shaft 25 is fixed to or abutted on one member 23. This shaft 25 is inserted into a temperature-sensing section 26 provided inside the other member 24, and this temperature-sensing section 26 has the same form as that shown in FIG.
The shaft 25 has the effect of pushing out the shaft 25 by being heated.

A valve seat 27 is formed in the partition wall 22, and a first valve body 28 that sits on the valve seat 27 from the side of the other member 24 is integrally constructed with the temperature sensing section 26, In addition, a second valve element 30 is fitted into a shaft rod 29 that protrudes from the opposite end of the temperature sensing section 26 from the end where the first valve element 28 is formed. This second valve body 30 is seated on a valve seat 33 formed between an inlet passage 31 and an outlet passage 32 of cooling water of an engine (not shown).

The first valve body 28 is configured so that elastic force is applied by a two-stage spring 34, and the first-stage spring 36A for this purpose is a projection formed on the other member 24. The second stage spring 36B is installed between the ring 37 surrounding the temperature sensing part 26 and the end wall 38 of the other member 24. In this case, the spring constant of the first stage spring 36A and the set pressure of the second stage spring 36B are
The value should be commensurate with the rotational suction negative pressure that causes bar heat.

[0014] This is also applied to the second valve body 30 on the valve seat 33.
In order to seat the spring 39 in the other member 2,
A circulation passage 42 is formed which extends from the engine cooling water outlet passage 32 to the thermostat inlet 41 with the radiator 40 interposed therebetween.

In the above configuration, when the engine is running at high speed, the first valve body 28 is slightly opened even before warm-up, so that the service The temperature of the mostat inlet 41 gradually increases. Therefore, when the water temperature rises and the first valve body 28 fully opens to receive the action of the second spring 36, the water temperature at the thermostat inlet 41 rises considerably. and does not cause extreme hunting. Note that during warm-up at low rotation speeds, the first valve body 28 is closed, and no deterioration of the warm-up characteristics occurs.

[0016]

Effects of the Invention According to the invention of claim 1 of the present invention, the service is supplied from the first valve body through the circulation passage in which the radiator is interposed.
The cold water that has flowed into the Mostat can be prevented from coming into direct contact with the temperature-sensing part by the guide cylinder connected to the first valve body, so even if the thermostat is used with the inlet control method, it will not open once. In addition, in the invention of claim 2, a two-stage spring is adopted, and the setting pressure of the first stage spring is used to reduce the pressure. , even before warming up.
The first valve body is opened by the action of the first stage spring,
Similarly, there is an effect that a circulation pipe line in which a radiator is interposed can be secured.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the invention according to claim 1 of the present invention.

FIG. 2 is a sectional view of the invention according to claim 2 of the invention.

FIG. 3 is a configuration diagram of a conventional thermostat of this type.

FIG. 4 is a circuit diagram of the thermostat shown in FIG. 3 used in an outlet-controlled manner.

FIG. 5 is a circuit diagram of the thermostat shown in FIG. 3 used in an inlet control type;

FIG. 6 is an explanatory diagram when the thermostat is closed in the usage state shown in FIG. 5;

FIG. 7 is an explanatory diagram of the thermostat when it is open in the usage state shown in FIG. 5;

[Explanation of symbols]

1, 21 Frame structure 2, 22 Partition wall 3, 23 One member 4, 24 Other member 5, 25 Shaft 6, 26 Temperature sensing part 7, 27 Valve seat 8, 28 First valve body 9,29 Axis rod 10, 30 Second valve body 11, 31 Entrance passage 12, 32 Exit passage 13,33 Valve seat 14,15 Spring 16 Guide tube 17,40 Radiator 18, 42 Circulation pipe

Claims (2)

[Claims] Claim 1: A frame structure (1) that is divided into two members by a partition wall (2) has a shaft (5) fixed to or abutted against one member (3) that is attached to the other member (4). The first valve element (8), which is seated on the valve seat (7) formed in the partition wall (2), is inserted into the temperature sensing part (6) installed in the temperature sensing part (6).
6), and an engine cooling water inlet passage (
A valve seat (13) formed between the valve seat (11) and the outlet passage (12)
), and the first valve element (8) and the second valve element (10) are provided with springs that press against the respective valve seats (7, 13). (14, 15), and the first valve body (8) has a guide cylinder (16) extending from its outer periphery and surrounding the temperature sensing part (6).
An inlet control type thermostat characterized by forming: Claim 2: The shaft (25) fixed to or abutting one member (23) of the frame structure (21) divided into two members by the partition wall (22) is connected to the other member (24).
) into the temperature sensing part (26) installed inside the partition wall (2
The first valve body (2) seats on the valve seat (27) formed in the first valve body (2).
8) is integrated with the temperature sensing portion (26), and an engine cooling water inlet passage (31) and an outlet passage (32) are provided on the shaft rod (29) protruding from the temperature sensing portion (26) )
The second valve body (
30), and springs (34, 39) that press against the respective valve seats (27, 33) are applied to the first valve body (28) and the second valve body (30). , a first stage spring (36A) in which the spring (34) loaded on the first valve body (28) is set to a set pressure equivalent to the rotational blowing load that causes overheating of the engine; ,
A second stage spring (with a higher set pressure) that acts when the first valve body (28) reaches a certain degree of opening
36B)
Mostat.