JPS6150193B2 - - Google Patents

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.

Conventionally, there is a thermostatic mixing valve as described in Japanese Patent Application Laid-open No. 134080/1983. As shown in FIG. 1, the interior of the valve body 100 includes a water chamber 101 and a hot water chamber 102 that communicate with a water supply source and a hot water source, respectively, and a mixing chamber 1 that communicates with both chambers.
03, and a water chamber 101 and a hot water chamber 102 are communicated with a mixing chamber 103 via a control valve body 104. The control valve body 104 touches and separates from a water valve seat 105 and a hot water valve seat 106 formed on the water chamber 101 and hot water chamber 102 sides, respectively, and sets the mixed water temperature by adjusting the valve opening degree. The control valve body 104 can be moved forward and backward by a handle H provided outside the main body 100, and has a temperature sensing section inside.
07 and an actuating spring 109 that biases the control valve body 104 in the direction of 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 can be moved in the left-right direction in FIG. 1 based on the rotation of the handle.

However, the tip 110 of the element case 108
The contact state between the control valve body 104 and the control valve body 104 is
Although the control valve element 104 is slidably supported by the partition wall 100a of the main body 100, it swings with the flow of hot water. When such rocking occurs, the displacement of the contact portion between the water valve seat 105 and the hot water valve seat 106, which constitutes the largest diameter portion of the control valve body 104, becomes large, and the valve opening degree changes. In addition, such oscillations occur when the control valve body 104 is moved back and forth during temperature control, and even if an attempt is made to set the mixed water temperature, the mixed water may overshoot the set temperature due to changes in the valve opening. This causes a cycling phenomenon in which the vehicle repeatedly undershoots. 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.

In order to achieve the above technical problems, the present invention has the following features:
A water flow path, a hot water flow path, and a mixed water flow path that communicates with both flow paths via a control valve body are provided, and the valve opening degree of the control valve body is changed in conjunction with an operating handle and in accordance with the mixed water temperature. The control valve body is biased toward the temperature sensing portion by an actuating spring, and the temperature sensing portion includes a temperature sensing member that expands and contracts depending on the temperature of the mixed water, and a temperature sensing member is provided inside the temperature sensing portion. In the thermostatic mixing valve, the thermostatic mixing valve is provided with a hollow element case that is fixed to the handle and moves forward and backward in the moving direction of the control valve body in conjunction with the handle, wherein the control valve body is provided with a hollow element case provided in the hot water flow path and the water flow path. A guide cylinder whose end surfaces come into contact with and separate from the hot water valve seat and the water valve seat, and a partition wall having a hot water inlet for communicating the hot water flow path and the mixed water flow path are formed in the middle of the guide cylinder, and the element The case has a water inlet located in the water flow path and a mixed water outlet located in the mixed water flow path, and the end of the element case is inserted into the guide cylinder of the control valve body to close the partition wall. Place it in contact with the
The water flow path is characterized in that an annular cross-sectional flow path is formed between the outer circumference of the element case and the inner circumference of the guide cylinder, and the water flow path communicates with the water inlet.

With the above configuration, the element case annularly contacts the partition wall at a position away from the center of the control valve body to suppress swinging of the control valve body around the axis.
Changes in valve opening degree can be prevented. In addition, since the flow path on the water side includes an annular cross-sectional flow path defined between the element case and the control valve body, the flow path resistance becomes large and the effect of reducing the pressure of the water supply is also obtained.

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 component damage and improve durability.

(3) When 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 it can mix 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 explained in detail based on embodiments shown in the drawings.

FIG. 2 is a front sectional view of the hot water mixing faucet according to the present invention, and FIG. 3 is a sectional view taken along the - line arrow in FIG. 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.

Inside the main body 1 of the hot water mixing faucet, there is a water flow path F _C that communicates with a water supply source, a water supply pipe 2 that connects to the hot water source, and a hot water supply pipe 3.
A hot water flow path _FH is defined. Both flow paths F
Mixed water flow path F communicating with _C , _FH via control valve C
_M is provided, and in this example, the mixed water flow path F _M is the main body 1
It extends substantially into the short pipe 4 connected to the hot water system by forming a screw at the upper end thereof.

As shown in FIG. 3, a flow rate regulating valve 3a and a check valve 3b and a strainer 3c are provided in the hot water supply pipe 3 at the connection part with the main body 1, respectively, to adjust the flow rate from the hot water source into the main body 1 and prevent backflow. It is configured to prevent foreign matter from entering. In addition, similar flow rate adjustment valve 2a, check valve 2b and strainer 2 are also installed in the water supply pipe 2.
c is provided.

Reference numeral 5 denotes a cylindrical operating part fixed to be located in the mixed water flow path F _M in the main body 1 from the side where the water supply pipe 2 is attached;
Reference numeral 6 denotes a spindle which is rotatably supported by the cylinder body 5 of the operation section and has a handle 8 for temperature setting connected to the protruding part from the main body 1 with a screw 7;
The spline 8a engages with the spline 8a to rotate integrally with the handle 8, and it is a stopper for regulating the rotation angle of the handle 8 in cooperation with a point mounting bracket 10, which will be described later. The spline 6a is engaged to transmit the information. Reference numeral 10 denotes a point mounting bracket to which a point 10a serving as an index when setting the temperature is attached, and is engaged with a spline 6b on the operating section cylinder 5 to keep its relative mounting position to the main body 1 in an immovable state. An index 11 indicating the temperature numerically is attached to the circumferential surface of the handle 8 in a winding manner to set the temperature, and when the handle 8 is rotated so as to match an arbitrary value with the point 10a. , the control valve C can be moved to obtain a mixed water temperature approximately equal to the numerical value.

In the operation part cylinder 5, 12 is the same operation part cylinder 5.
A cylindrical operating shaft 13 is rotatably screwed into a screw 5a on the inner periphery and engaged with a spline 6c on a spindle 6, and strokes in the axial direction while being rotated by the rotation of the spindle 6. A first spring 15 is interposed between a first spring receiver 14 slidably fitted in the cylindrical operating shaft 12 and the spindle 6 to prevent natural rotation of the handle 8; Spring receiver 16 and the first
A safety spring provided between the spring receivers 14 and a presser 17 for holding the second spring receiver 16 are provided.

18 is a hollow cylindrical element case that is slidably attached to the annular seats 1a and 1b of the main body 1 and whose interior serves as a flow path for mixed water;
Together with a temperature sensing element 19 coaxially fixed in the inside of the temperature sensing section 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 wax pellet in which wax is sealed as a temperature sensing material. This is a configuration in which the pin 20 is pressed by the thermal expansion of the wax within the temperature sensing element 19, and this pin 20 comes into contact with the second spring receiver 16, and this reaction moves the element case 18 back and forth in its axial direction.

Reference numeral 23 denotes a control valve body operated by the element case 18, which includes a bushing 24 screwed onto the main body 1, and an operating spring in the mounting cylinder 25 connected to the hot water valve seat cylinder 28 mounted on the bushing 24. 26 biases the handle in the 8 direction.

Figure 4 shows the element case 18 and control valve body 23.
It is an enlarged sectional view showing a contact state of the element case 18 and the first cylindrical portion 1 which is located in the mixed water flow path F _M and is slidably supported by the annular seats 1a and 1b.
8a, and a large-diameter second cylindrical portion 18b located within the water flow path _FC . A mixed water outlet 21 is provided in the first cylindrical portion 18a, and a water inlet 22 is provided in the second cylindrical portion 18b.

The tip of the second cylindrical portion 18b is an annular valve body contact surface 1
8c, and the contact surfaces are molded to be flush.

The control valve body 23 has a substantially H-shaped cross section taken along a plane including the axis, and is slidably supported by an annular seat 1d provided in the partition wall 1c between the water flow path F _C and the hot water flow path F _H. Cylindrical guide tube 23a and guide tube 2
3a, and a partition wall 23b provided halfway within 3a. The partition wall 23b has a plurality of hot water inlets 27 in the axial direction, and communicates the hot water flow path _FH 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.
The contact surface is in contact with the contact surface with an annular contact surface. With this arrangement, an annular flow path F _T can be defined between the guide tube 23a and the element case 18, and a water flow path F _C
Water passes through this annular flow path F _T and flows into the element case 18 from the water inlet 22 .

One end surface 23c of the guide tube 23a is connected to the hot water valve seat 28 on the end surface of the hot water valve seat tube 28 attached to the bushing 24.
The annular end surface 23d on the other side can be moved toward and away from an annular water valve seat 29 formed in the main body 1 to form a water valve.

In the above configuration, when the handle 18 is rotated in the temperature setting direction, the cylindrical actuating shaft 12 moves in the axial direction as the spindle 6 rotates, and in response, the element case 18 moves the temperature sensing part T. Temperature sensing body 1
9, the hot water valve and the water valve of the control valve body 23 can be opened and closed coaxially and simultaneously together with the actuating spring 26 that responds to the stroke movement. That is, in FIG. 2, the annular end face 23c of the control valve C is seated on the hot water valve seat 28a and the hot water valve is closed, and water is flowing from the open water valve to the water inlet 22 from the water flow path F _C. The water supply state is shown in which water flows through the element case 18, passes through the temperature sensing part T, and flows into the mixed water flow path F _M 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 cylindrical actuating shaft 12 is moved to the right in FIG. 2 via the spindle 6. Along with this, the element case 18 similarly moves, and the control valve element 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 flows through the hot water valve seat 28a and the hot water inlet 27.
It reaches the inside of the element case 18 through the water flow path F.
It mixes with the water from _C , flows down from the mixed water outlet 21 into the mixed water flow path F _M , and is fed to a water discharging device (not shown).

During the stroke movement of the control valve body 23 as described above, the partition wall 23b of the control valve body 23 is pressed by the annular valve body abutment surface 18c at the tip of the element case 18.
It advances and retreats in the axial direction without rocking as it moves. Therefore, the valve opening degrees of the hot water valve and water valve are increased or decreased by the movement of the element case 18, and the valve opening degrees for each valve seat 28a, 29 do not fluctuate, thereby preventing a cycling phenomenon when setting the temperature. I can do it.

Further, water from the water flow path F _C passes through the annular flow path F _T as described above, and further flows into the element case 18 which is the mixing start position via the water inlet 22. Since the flow path resistance on the water side is larger than that on the hot water side, the pressure of the water from the high pressure water source side is reduced and the pressure is made approximately equal to the pressure of the hot water, which has a large pressure loss, after passing through a boiler etc. be able to. Therefore, since the mixing conditions for hot water and water can be set equally for a constant valve opening degree, temperature setting and temperature control during use can be performed reliably.

Note that 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 portion T will thermally expand (or contract) and move the control valve body 23, causing the hot water valve and The opening degree of the water valve can be adjusted, and the temperature of the mixed water can be automatically adjusted to maintain the set temperature.

Further, reference numeral 30 denotes a metal cover that is screwed onto the operating portion cylinder 5 so as to cover the entire handle 8 and is integrally attached to the main body 1 in a detachable manner. This is installed after setting the temperature using the handle 8, and is intended to prevent accidental touching of the handle 8 or unnecessary turning operations by outsiders, thereby preventing sudden fluctuations in the temperature of the mixed water. belongs to.

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
A temperature sensing rod extends into the short tube 4 to detect the temperature of the mixed water, and 34 is a temperature display meter that rotates a pointer 35 based on the temperature detected by the temperature sensing rod 33 to display the temperature.

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

[Brief explanation of the drawing]

FIG. 1 is a sectional view of 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, and FIG.
The figure is a sectional view taken along the line in FIG. 2, and FIG. 4 is an enlarged sectional view showing a state in which the element case and the control valve body are in contact with each other. DESCRIPTION OF SYMBOLS 1... Main body, 8... Handle, 18... Element case, 19... Temperature sensing element, 21... Mixed water outlet, 22... Water inlet, 23... Control valve body, 2
3a... Guide cylinder, 23b... Partition wall, 26... Operating spring, 27... Hot water inlet, 28a... Hot water valve seat, 29... Water valve seat, C... Control valve, F _C ...
Water flow path, F _H ...Hot water flow path, F _M ...Mixed water flow path, F
_T ...Annular channel, T...Temperature sensing part.

Claims (1)

[Claims] 1. A water flow path, a hot water flow path, and a mixed water flow path that communicates with both flow paths via a control valve body are provided, and the valve opening degree of the control valve body is controlled in conjunction with an operating handle and in accordance with the temperature of the mixed water. The control valve body is biased toward the temperature sensing portion by an operating spring, and the temperature sensing portion is provided with a temperature sensing member that expands and contracts according to the temperature of the mixed water; A thermostatic mixing valve comprising a hollow element case that is fixed inside and moves forward and backward in the movement direction of the control valve body in conjunction with the handle, wherein the control valve body is provided with a hollow element case in the hot water flow path and the water flow path. A guide cylinder having both end surfaces in contact with and away from the hot water valve seat and the water valve seat, and a partition wall having a hot water inlet for communicating the hot water flow path and the mixed water flow path are formed in the middle of the guide cylinder, The element case has a water inlet located in the water flow path and a mixed water outlet located in the mixed water flow path, and the end portion of the element case is inserted into the guide cylinder of the control valve body. 1. A thermostatic mixing valve, characterized in that the thermostatic mixing valve is disposed in contact with a partition wall, and an annular cross-sectional flow path is formed between the outer periphery of the element case and the inner periphery of the guide cylinder, the water flow path communicating with the water inlet.