JPS59222685A - Mixing valve for thermostat - Google Patents

Abstract

PURPOSE:To prevent a control valve body from tilting and rocking, by making the tip end of an element case provided with a temperature sensor part contact with the whole circumference of a peripheral part of the control valve body. CONSTITUTION:An element case 18 having a temperature sensor body 19 and operating a control valve body 23 is made contact with the control valve body 23 via an annular contact surface. With this constitution, the control valve body 23 advances or retreats to or from the axial direction without being rocked following a movement in the element case 18. Therefore, valve opening to each of valve seats 28a and 29 is in no case varied at all, so that a cycling phenomenon in time of temperature setting is preventable from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermostatic mixing valve that is equipped with a temperature sensing part and is capable of mixing hot water and water and discharging mixed water at a desired temperature. There is a valve body as described in Japanese Patent No. 57-134080.
A water chamber (101) that communicates with a water supply source and a hot water supply source through
), a bath room (102) and a mixing room (103) communicating with the drawing room.
), and the ice chamber (101) and hot water chamber (102) are configured to communicate with the mixing chamber (103) through a control valve body (104). The control valve body (104) is in the ice chamber (101
) and the water valve pressure (1,
05) and the hot water valve seat (106), and the mixed water temperature is set by adjusting the valve opening degree. The operation of this control valve body (104) is controlled by a handle (formerly) provided outside the main body (100) that can move forward and backward, and a temperature-sensing section (104) inside.
07) and an actuating spring (109) that urges the control valve body (104) toward the element case (100). That is, the tip (110) of the element case (108) is in contact with the control valve body (104), and the control valve body (104) is moved in the left-right direction in FIG. 1 based on the rotation of the noddle. This configuration allows for

However, the tip (110) of the element case (108)
The contact state between the control valve body (104) and the control valve body (104)
4) has a point-contact structure at approximately the center of the control valve body (
Even though the valve body (104) is slidably supported by the partition wall (10(la)) of the main body (100), it oscillates due to the flow of hot water.When such oscillation occurs, the control valve body (104)
4) The water valve seat (105) and the hot water valve seat (
106) becomes large, and the valve opening degree changes. In addition, when the control valve body (104) is moved back and forth on the temperature side 4, such oscillations occur, and even if you try to set the mixed water temperature, the mixed water will not reach the set temperature due to changes in the valve opening. This causes a cycling phenomenon in which overshoots and undershoots are repeated.

Due to such changes in the valve opening degree, it is difficult to set the temperature, and hot water is discharged unnecessarily.

The problem described above is that the contact form between the control valve body and the element case that abuts and supports the control valve body in its movement direction is in a point contact state only at approximately the center of the control valve body, which causes the control valve body to easily swing. This is due to this.

The technical problem to be solved by the present invention is to move the control valve body so that the tip of the element case, which is equipped with a temperature sensing part that drives the control valve body forward and backward, comes into contact with the entire periphery of the control valve body. The purpose is to prevent tilting and swinging.

A means for achieving the above technical problem is that in a thermostatic mixing valve having a temperature-sensing section, an element case that forms part of the temperature-sensing section and operates a control valve body is in annular contact with the control valve body. It has a surface and comes into contact with it.

With the above technical means, the control valve body is supported on one side by the element case so as to prevent rocking around the axis, and by eliminating rocking, changes in the valve opening degree can be prevented. This can prevent the cycling phenomenon when setting the temperature.

The present invention achieves the following unique effects with the above configuration.

(1) Since the control valve body can be prevented from swinging, the temperature can be set reliably without changing the valve opening degree.

(2) Since the contact area between the control valve body and the element case is large, it is possible to reduce the surface pressure per unit area that interacts with both, and it is possible to prevent member damage and improve durability.

(3) When the water flows down the mixed water flow path, it passes through the control valve body through the annular flow path defined by the element case, so the pressure is reduced, and the water can be mixed well with hot water from the hot water source, which has a lower pressure than the water supply source. Temperature control can be performed accurately.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 2 is a front cross-sectional view of a hot water mixing faucet according to the present invention, and FIG. 3 is a sectional view of 1 in FIG. It is a sectional view taken along the line -1. In this embodiment, the hot water supply source is a hot water boiler connected to a piping system in a boiler room, and a centralized hot water supply system supplies mixed hot water at a desired temperature to a plurality of water spouts and shower equipment installed in the system.

The main body of the hot water mixing faucet (inside 11 is the water supply pipe (2) that connects to the water supply source and the water supply pipe (3) that communicates with the hot water supply pipe (3)
) and a vortex flow path (Fo) are defined. A mixed water flow path (FM) is provided which communicates with both of these flow paths (Fc) and (FH) via a control valve (C). In this example, the mixed water flow path (FM) is connected to the main body (11) and It extends substantially into a short pipe (4) which is threaded and connected to the hot water supply system.

As shown in Figure 3, there is a flow rate regulating valve (3) in the hot water pipe (3).
A check valve (3b) and a strainer (3c) are provided at the connection parts with the main body (1)
It is configured to be able to adjust the flow rate into the tank and prevent backflow and foreign matter from entering. In addition, similar flow rate adjustment valve (2a), check valve (2b) and strainer (
2c) is provided.

(5) is an operating part cylinder that is fixed from the water supply pipe (2) installation side to the main body (11) so that it is located in the mixed water flow path (FM), (6) is the same operating part cylinder (5) rotatably supported,
A spindle with a handle (8) for temperature setting connected to the protruding part from the main body (1) with a screw (7), (9) is connected to the handle (8) by a spline (8a) and the handle (
This is a stopper that rotates integrally with the spindle (6) and regulates the rotation angle of the handle (8) in cooperation with the QOI of the point handle (1), which will be described later.
8) is engaged with the spline (6a) so as to transmit the rotational force. In addition, (101 is a point that serves as an index when setting the temperature), it is a point mounting bracket that is larger than (10a), and the spline (6b) engages with the operation part cylinder (5) to connect it to the main body (1). The relative mounting position is fixed. An index (11) indicating the temperature numerically is wound around the circumference of the handle (8) to set the temperature.
, and point any number (10a
) by rotating the handle (8) so that it aligns with
The control valve (C) can be moved to obtain a mixed water temperature approximately equal to the numerical value.

Inside the operating section cylinder (5), (12) is rotatably screwed into the screw (5a) on the inner periphery of the operating section cylinder (5) and is engaged with the spindle (6) by a spline (6c). A cylindrical operating shaft (13) is slidably fitted into the cylindrical operating shaft (12), and the cylindrical operating shaft (13) rotates and strokes in the axial direction by the rotation of the spindle (6). a first spring (1) that is interposed between the ring receiver (14) and the spindle (6) and prevents the handle (8) from rotating naturally;
5) is a safety spring provided between the second spring receiver (16) and the first spring receiver (14) which are also slidable;
and (17) are pressers for holding the second spring receiver (16).

(18) are the annular seats (la) and (lb) of the main body (1)
) is a hollow cylindrical element case that is slidably attached to the element case (18) and serves as a flow path for the mixed water. constitutes part (T). The temperature sensing element (19) has a length such that its tip reaches the second spring receiver (16) in the operation section cylinder (5), and is a so-called Wankusperesoto in which wax is sealed as a temperature sensing material. This is because the pin (20) is pushed out due to the thermal expansion of the wax inside the temperature sensing element (19), and this pin (2o) comes into contact with the second spring receiver (I6), and this reaction causes the element case (18) to be pushed out. It is configured to move forward and backward in the axial direction.

(23) is a control valve body operated by the element case (18), and has a bushing (24) attached to the main body (1) and a valve seat front (28) attached to the bushing (24). It is biased toward the handle (8) by an operating spring (26) within the connected mounting cylinder (25).

Figure 4 shows the element case (18) and control valve body' (23).
) is an enlarged sectional view showing a contact state of the element case (18) and the first element case (18) located in the mixing water flow path (FM) and slidably supported by the annular seats (la) and (lb).
The cylindrical portion (18a) and the second cylindrical portion (18b) located within the water flow path (Fc) are formed in a cylindrical shape with different diameters. The first cylindrical part (18a) has a mixed water outlet (21
), and the second cylindrical part (18b) has a water inlet (22).
have been established respectively.

The tip of the second cylindrical portion (18b) has an annular valve body contact surface (18
c), and the contact surfaces are molded to be flush.

The cross section of the control valve body (23) taken along a plane including the axis is approximately H.
a cylindrical guide tube (23a) that is slidably supported on an annular seat (1d) provided in a partition wall (1c) between the water flow path (Fc) and the hot water flow path (FH); The same guide tube (
23a), and a partition wall (23b) provided halfway within 23a). The partition wall (23b) has a plurality of hot water inlets (27) opened in the axial direction, and communicates the hot water flow path (FM) with the inside of the element case (18).

The inner diameter of the guide tube (23a) is the same as the element case (18).
As shown in the figure, the element case (18) is loosely inserted into the guide cylinder (23a), and the valve body contact surface (18c) is larger than the outer diameter of the second cylindrical part (18b) of the partition wall (23b).
) with an annular contact surface. With this arrangement, an annular flow path (Ft) can be defined between the guide tube (23a) and the element case (18), and a water flow path (Ft) can be defined between the guide tube (23a) and the element case (18).
Water from c) passes through this annular flow path (F□) and flows into the element case (18) from the water inlet (22).

The − side end surface (23C) of the guide tube (23a) is connected to the hot water valve seat (23C) on the end surface of the hot water valve seat portion (28) attached to the bushing (24).
28a) to connect and separate the hot water valve to the annular end surface (23d) on the other side.
can be moved toward and away from an annular water valve seat (29) formed on the main body (11) to form a water valve, respectively.

In the above configuration, when the handle (18) is rotated in the temperature setting direction, the cylindrical operating shaft (12) moves in the axial direction 1iiJ as the spindle (6) rotates, and in response to this, the element case (18) performs a stroke motion via the temperature sensing element (19) of the temperature sensing part (T), and the control valve body (23) and the actuating spring (26) respond to this stroke movement.
The hot water valve and water valve can be opened and closed simultaneously on the same axis. That is, Figure 2 shows system 1. Goben(
The annular end face (23C) of C) is seated on the hot water valve seat (28a) and the hot water valve is closed, and water flows from the open water valve to the water inlet (22) from the water flow path (Fc). The water supply state is shown in which water flows into the element case (18), passes through the temperature sensing part (T), and flows into the mixed water flow path (FM) from the mixed water outlet (21).

From this stage, when the handle (8) is rotated counterclockwise around its axis and the desired temperature value of the index (11) is aligned with the point (10a), the spindle (6)
The cylindrical operating shaft (12) moves to the right in Fig. 2 through the element case (18).
Similarly, the control valve body 23) is moved away from the hot water valve seat (28a) by the biasing force of the operating spring (26), and the hot water valve is opened.

Therefore, the hot water from the hot water flow path (FH) is transferred to the hot water valve seat (28a),
It reaches the element case (1B) through the hot water inlet (27), mixes with water from the water flow path (Fc), flows down from the mixed water outlet (21) to the mixed water flow path (F M), and is discharged from the water spouting device. (not shown).

In the stroke movement of the control valve body (23) as described above, the control valve body (23) has its partition wall (23b) pressed by the annular valve body contact surface (18c) at the tip of the element case (18). Therefore, the element case (18) moves forward and backward in the axial direction without swinging as the element case (18) moves.

Therefore, the opening degree of the hot water valve and water valve is determined by the element case (1
8) will be increased or decreased by the movement of each valve seat (28a),
The valve opening degree with respect to (29) does not fluctuate, and the cycling phenomenon during temperature setting can be prevented.

In addition, water from the water channel (Fc) passes through the annular channel (F) as described above, and further passes through the water inlet (22) to reach the mixing start position. - Flows into the case (18). In this way, the flow path resistance on the water side is larger than that on the hot water side, so water from the high-pressure water source side is depressurized and passed through a boiler etc. to approximately equal the pressure of the hot water, which has a large pressure loss. be able to. Therefore, for a constant valve opening,
Since the mixing conditions for hot water and water can be set equally, temperature setting and temperature control during use can be performed reliably.

Furthermore, even if temperature fluctuations occur in the hot water supply source and the water supply source, the wax sealed in the temperature sensing element (19) of the temperature sensing part ('F) will thermally expand (or contract) and cause the control valve body (23 ) can be moved to adjust the valve opening degrees of the hot water valve and water valve, and the temperature of the mixed water can be automatically adjusted to maintain it at the set temperature.

Further, (30) is a metal cover that is screwed onto the operating section cylinder (5) so as to cover the entire handle (8) and is integrally attached to the main body (11) in a detachable manner. This is to prevent unnecessary rotational operations by outsiders and to prevent sudden fluctuations in the temperature of the mixed water.

Further, (31) is a thermometer for detecting and displaying the temperature of the mixed water in the mixed water flow path (FM), and is attached via a bush (32) screwed into the short pipe (4). (33
) is a temperature sensing rod that extends into the short tube (4) to detect the temperature of the mixed water, and (34) is a temperature display by rotating the pointer (35) based on the temperature detected by the temperature sensing rod 33). It is a temperature display meter.

The present invention is not limited to the above-described embodiments and can be modified in various ways.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main parts of a conventional thermostatic mixing valve, Fig. 2 is a front sectional view of a thermostatic mixing valve according to the present invention, Fig. 3 is a sectional view taken along the line II in Fig. 2, and Fig. 4 The figure is an enlarged sectional view showing a state in which the element case and the control valve body are in contact with each other. +11 Main body (8) Handle (18)
Element case (19) Temperature sensor (21) Mixed water outlet (22) Water inlet (23) Control valve body (23
a) Guide tube (23b) Partition wall (26) Operating spring (27) Hot water inlet (28a) Hot water valve seat
/(29) Water valve seat (C) Control valve (Fc) Water flow path (F) I) Vortex flow path (FM) Mixed water flow path
(F□) Annular flow path ("r'") Temperature sensing part Patent applicant: Totoki Co., Ltd. agent Masu Kobori (and 2 others) Fig. 2 Fig. 3 Fig. 4) 22 to 2S 181 2 knee// 6b d)C

Claims (1)

[Claims] 1. Inside the main body, there is a water flow path, a vortex flow path, a mixed water flow path that communicates with both flow paths via a control valve, and a mixed water flow path that is provided in the mixed water flow path and moves forward and backward by operating a handle outside the main body. A thermostatic mixing valve comprising: a temperature-sensing section that operates the control valve according to temperature, the control valve having a control valve element biased toward the handle by an operating spring; , a guide cylinder having both end surfaces in contact with and away from a hot water valve seat and a water valve pressure respectively formed in the vortex flow path and the water flow path, and a partition wall provided halfway inside the guide cylinder and having a hot water inlet. The temperature-sensing section has a temperature-sensing element that can expand and contract in the axial direction according to the temperature of the mixed water, and a hollow cylindrical element case in which the temperature-sensitive element is inserted and fixed, and a water inlet and a mixed water outlet are respectively opened. The side of the element case opposite to the control valve is inserted between the inner walls of the guide cylinder of the control valve body so as to define an annular flow path, and the element case has a hot water inlet and the inside of the element case communicated with each other. A thermostatic mixing valve characterized in that it abuts against a bulkhead so that it can