JPH0728529Y2 - Water temperature detector for forced circulation circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use and Outline of the Invention] The present invention relates to a water temperature detection device for a forced circulation circuit, and more particularly to a water temperature detection device for a circulation circuit in a forced circulation bathtub or the like. The water temperature detecting sensor can be easily inserted into the constituent portion, and the water temperature detecting accuracy of the water temperature detecting sensor can be improved.

[Prior Art and its Problems] In a forced circulation type bath kettle, as shown in FIG. 4, a pump (P) for forced circulation is incorporated in a heat exchanger (1) configured to form a circulation circuit with a bath. There is a format that can be used.

In this type of bath kettle, a pair of connecting pipes (11) (12) connecting the heat exchanger (1) and the bathtub (B) are short-circuited to form an auxiliary circuit (2) via a pump (P). The lower connecting pipe (11) is provided with a suction pipe (13) bent in an L-shape, and the upper connecting pipe (12) is bent into an L-shaped discharge pipe (1).
4) is provided, and these suction pipes (13) (1
4) Between them is connected by the auxiliary circuit (2).

In this case, when the pump (P) is in the operating state, the suction action by the discharge pressure from the discharge pipe (14) acts on the main circulation circuit via the heat exchanger (1) to cause the heat exchange in the heat exchanger (1). The flow from the communication pipe (11) side to the communication pipe (12) side is promoted, and the heat exchange efficiency in the heat exchanger (1) is improved.

In a bath cooker equipped with this type of heat exchanger, a water temperature detection sensor (21) is inserted in the auxiliary circuit (2) to detect the temperature in the bathtub (B), ) When the temperature of the hot water inside reaches a predetermined temperature, the pump (P) and the heat exchanger (1) are controlled by the output of the water temperature detection sensor (21).
The operation of the combustion device corresponding to the above is stopped.

Conventionally, as a structure for inserting the water temperature detection sensor (21), as shown in FIG. 5, a mounting cylinder portion (22) is provided in a part of the auxiliary circuit (2) to open the branch pipe. A water temperature detection sensor (21) is inserted from the end, and an airtight means such as an O-ring is interposed between the water temperature detection sensor (21) and the mounting cylinder portion (22) at this insertion portion.

With this configuration, it is necessary to insert the water temperature detection sensor (21) into the mounting cylinder (22) with a separate airtight means interposed, and therefore the water temperature detection sensor (21) has a special configuration. And need to. In other words, it is necessary to use a water temperature detection sensor (21) having an O-ring mounting part, and moreover,
It is necessary to have a configuration in which this water temperature detection sensor (21) can be inserted and fixed in the mounting cylinder part (22).

Further, in this conventional one, since the auxiliary circuit (2) is inserted in the linear flow path, this auxiliary circuit (2)
There is a problem that the detection accuracy of is insufficient. This is because, in the linear flow path, the water passing through the flow path has a laminar flow, and thus the detected temperature varies depending on which part of the temperature distribution of the laminar flow comes into contact.

According to the present invention, such a "compulsory circulation circuit is configured by inserting a pump (P) into a part of the circulation circuit, and this forced circulation circuit is connected to the suction pipe (13) and the discharge pipe (14) and the pump ( P)
In the water temperature detection device of the forced circulation circuit in which the water temperature detection sensor (21) is inserted into this connection pipe, the water temperature detection accuracy of the water temperature detection sensor (21) is improved. Another object is to simplify the assembly of the forced circulation circuit and the attachment of the water temperature detection sensor (21).

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is that "the suction pipe (13) is connected to the suction port of the pump (P) by a connecting pipe (2a) bent in an L shape. Then, the other discharge pipe (14) and the discharge port of the pump (P) are connected by a connecting pipe (2b), and the connecting pipes (2a) and (2b) are both elastic pipes such as rubber, and the connecting pipe ( At the bending point of 2a), a tube part (23) is provided that projects substantially coaxially with the downstream axis of the circulation circuit, and a water temperature detection sensor (21) is press-fitted into this tube part (23) to circulate the detection part. It was projected into the circuit. "

[Operation] The technical means of the present invention operates as follows.

Since the connection pipe (2a) and the connection pipe (2b) are both made of elastic pipes such as rubber, the pump (P) and the suction pipe (13)
Also, by simply fitting the connection tube with the discharge pipe (14) to the outside, the connection of the connection is ensured. That is, this connection constitutes a forced circulation circuit, and the pump (P) is inserted in this circuit.

The water temperature detection sensor (21) has a structure in which it is press-fitted into the tubular portion (23) formed in the connection pipe (2a), and moreover, since this connection pipe (2a) is composed of an elastic tube such as rubber, By simply press-fitting the water temperature detecting sensor (21) into the tubular portion (23), the seal of the mounting portion of the water temperature detecting sensor (21) is secured.

When water flows from the connecting pipe (2a) to the connecting pipe (2b),
Since the mounting portion of the water temperature detection sensor (21) is located at the bending point of the connection pipe (2a), a turbulent flow state occurs in this portion, and the water in the connection pipe (2a) is mixed. That is, even if there is a difference in the temperature distribution in the cross section of the flow path up to the inflection point, the temperature distribution is eliminated or becomes uniform by the turbulent flow in this portion.

On the other hand, at the bending point of the connecting pipe (2a), the cylindrical portion (23) is provided which projects substantially coaxially with the downstream axis of the circulation circuit.
Since the water temperature detection sensor (21) is press-fitted into the inside of 3), the detection part of the water temperature detection sensor (21) will protrude toward the downstream side of this bending point, and the temperature distribution will be eliminated in this detection part. The temperature of the part where the temperature distribution is performed or has a uniform temperature distribution is detected.

[Effects] The present invention having the above-described configuration has the following unique effects.

Since the detection part of the water temperature detection sensor (21) detects the temperature at a location where the temperature distribution is eliminated or has a uniform temperature distribution, the water in the upstream portion of the connection pipe (2a) is detected. Since the average temperature is accurately detected, the water temperature detection accuracy is improved.

Also, connect the connecting pipes (2a) and (2b), and connect the connecting pipes (2a)
Since the circulation circuit equipped with the pump (P) and the water temperature detection sensor (21) can be configured only by press-fitting the water temperature detection sensor (21) into the tubular portion (23) provided in the, the construction work of this circulation circuit is simple. Is.

Furthermore, since the hot water detection sensor is press-fitted into the suction side of the pump, no special sealing prevention means or the like is required.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The device of this embodiment is implemented in a forced circulation type bath kettle as in the above-mentioned conventional example, and is a connecting portion of the connecting pipe (11) and the connecting pipe (12) in the heat exchanger (1). A suction pipe (13) and a discharge pipe (14) that are bent in an L shape are provided in a continuous portion of the suction pipe (13) and one end of the discharge pipe (14) are projected from the heat exchanger (1), The other end is housed in each of the connecting pipes (11) and (12) so as to be coaxial or parallel to the connecting pipes (11) and (12), and the protruding direction thereof is the side of the bathtub (B) to which the connecting pipe (11) and the connecting pipe (12) are connected. Is set to.

As shown in FIGS. 2 and 3, the suction pipe (13) and the discharge pipe (14) are vacant chambers (10) formed in the peripheral wall of the heat exchanger (1).
Projecting into the connecting pipes (11) and (12), and the vacant chamber (10) is arranged over the entire peripheral wall of the heat exchanger (1). The endothermic pipes (15) are connected between the opposing walls of the peripheral wall in an inclined posture so that the empty chambers (10) (10) in the opposing walls communicate with each other, and a large number of fins (F) are connected to the endothermic pipes (15). (F)
It is equipped with.

Therefore, in this embodiment, like the above-mentioned conventional example, the bathtub (B) communicated with via the connecting pipe (11) and the connecting pipe (12) is connected to the circulation circuit via the heat exchanger (1). Will be configured.

The auxiliary circuit (2) is constituted by connecting the suction pipe (13) and the discharge pipe (14) to the pump (P) as shown in FIG. 1, and the suction port ( The suction pipe (13) and the suction pipe (13) are connected by a connecting pipe (2a) bent in an L shape, and in this embodiment, the connecting pipe (2a) is made of rubber having heat resistance. The other connecting pipe (2b) is also made of the same material, and the pump (P)
The discharge port (17) and the discharge pipe (14) are communicatively connected by bending and connecting a straight pipe having a predetermined length according to the positions of the both.

The connecting pipe (2a) is provided with a tubular portion (23) at a bending point, and the tubular portion (23) is a downstream side portion of the connecting pipe (2a) connected to the suction port (16), that is, , Which is coaxial with the axis of the suction port (16) of the pump (P),
The shape of the inner peripheral surface of 3) is made to match the shape of the base end of the water temperature detection sensor (21) press-fitted into it, and the diameter of each part is smaller than the diameter of the corresponding part of the water temperature detection sensor (21). It is set slightly smaller.

Therefore, when the water temperature detection sensor (21) is inserted into the tubular portion (23), the base end portion of the water temperature detection sensor (21) is press-fitted into the tubular portion (23), and the seal of this insertion portion is secured. ,
The detection part (S) on the tip side of the water temperature detection sensor (21) projects toward the suction port (16) side of the pump (P). That is, it projects toward the downstream side of the flow in the connecting pipe (2a).

The water temperature detection sensor (21) is basically attached by press fitting into the tubular portion (23), but in this embodiment, a fastening band (24), a fastening ring, etc. are attached to the outer periphery of the tubular portion (23). As a result, the water temperature detection sensor (21) is firmly held.

The same applies to the connection portions at both ends of the connection pipes (2a) and (2b), and in this embodiment, the connection portions to the suction pipe (13) and the discharge pipe (14) and the suction port (16) and the discharge port (17). The same tightening band (24) (24) is attached to the connection part to () to fix the connection part.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX, FIG. 3 is a plan view, and FIGS. 4 and 5 are explanatory views of a conventional example. ) …… Pump (13) …… Suction pipe (14) …… Discharge pipe (21) …… Water temperature detection sensor (2a) …… Connection pipe (2b) …… Connection pipe (23) …… Cylinder

Claims (1)

[Scope of utility model registration request] 1. A forced circulation circuit is constructed by inserting a pump (P) into a part of the circulation circuit, and this forced circulation circuit corresponds to the suction pipe (13) and the discharge pipe (14) and the pump (P). In the water temperature detecting device of the forced circulation circuit of a type in which the water temperature detecting sensor (21) is inserted into this connecting pipe, the connecting pipe (2a that bends the suction pipe (13) into an L shape. ) Is connected to the suction port of the pump (P), and the other discharge pipe (14) and the discharge port of the pump (P) are connected by a connection pipe (2b), and the connection pipes (2a) (2b) are connected. Both are made of an elastic tube such as rubber, and a tube portion (23) is provided at the bending point of the connection pipe (2a) so as to project substantially coaxially with the downstream side axis of the circulation circuit, and a water temperature detection sensor is provided in the tube portion (23). Water temperature detection device for forced circulation circuit in which (21) is press-fitted and its detection part is projected into the circulation circuit.