JP2511781Y2 - Hot and cold water mixing tap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a hot and cold water mixing valve.

[Conventional technology]

BACKGROUND ART Conventionally, as a hot and cold water mixing valve, there is known a hot and cold water mixing valve including a flow rate setting unit, a temperature setting unit, and a hot water control unit, and the hot and cold water control unit controls the flow rates of hot water and water to perform a flow rate adjusting operation and a temperature adjusting operation. (For example, Japanese Patent Laid-Open No. 61-55485 or Japanese Utility Model Publication 1-1)
(See Japanese Patent No. 3528).

This kind of hot and cold water mixer has a flow rate adjusting handle of the flow rate setting unit, or a screw mechanism that interlocks with the temperature adjusting handle of the temperature setting unit.When the handle is rotated, the male and female screws of these screw mechanisms are The structure is such that it relatively rotates and relatively moves in the axial direction, and the movement is transmitted to the flow rate setting unit. The male screw and the female screw used in these screw mechanisms were those in which the tip of the screw was chamfered at an angle of approximately 120 ° or was not chamfered at all (see Fig. 4).

[Problems to be solved by the device]

FIG. 4 is an enlarged cross-sectional view showing a part of the tip of the male screw of the screw mechanism used in the above-mentioned conventional technique. A trapezoidal feed screw is used and the chamfering angle of the screw tip is 120 °. Therefore, at the thread cutting start portion at the tip of the screw (left end in the figure), the wall thickness at the outer diameter portion of the thread becomes smaller than the regular wall thickness t, and handling before the completion of assembly as a mixing stopper During this process, the thin part will be deformed and the fitting with the female screw will not be smooth, so that the so-called screw will not be seated well (such as being caught or having a feeling of stiffness). There was a problem that it got worse.

Such a problem occurs not only at the tip of the male screw but also at the end of the female screw.

Due to such a problem, the handle operation when adjusting the flow rate and the temperature was made uncomfortable, and the quality of the hot and cold water mixing valve was deteriorated.

The present invention has been made in view of the above problems, and an object thereof is to provide a hot and cold water mixing valve capable of solving the above problems.

[Means for solving the problem]

In order to achieve the above object, the present invention comprises a first screw mechanism (9) interlocking with a flow rate adjusting handle (10) and a second screw mechanism (22) interlocking with a temperature adjusting handle (18). The movable valve (13) is moved by a thermostat (26) to control the distance between the movable valve (13) and the hot water side seat (12) and the water side seat (14) to adjust the temperature. In the hot and cold water mixing tap, the end portions of the male screw (8,20) and / or the female screw (3,21) of the first screw mechanism (9) or the second screw mechanism (22) are chamfered at an angle of 30 ° to 90 °. It is characterized in that the diameter of the male screw tip is not more than the root diameter of the screw and the diameter of the tip of the female screw is not less than the root diameter of the screw.

[Action]

The diameter of the tip should be less than or equal to the root diameter of the thread for male threads, or greater than or equal to the root diameter of the threads for female threads, and a chamfering angle of 30 ° to 90 ° will increase the wall thickness of the threads at the ends of the threads. The strength of the screw thread is increased, the screw thread is not likely to be deformed in the process before the assembly is completed, the screw mechanism operates smoothly, and as a result, the operation feeling of the flow rate adjusting handle or the temperature adjusting handle is improved. .

〔Example〕

FIG. 3 shows a cartridge inserted into the outer shell of the main body (not shown) of the hot and cold water mixing valve. In addition, the flow rate adjustment handle and the temperature adjustment handle are not inserted into the outer shell of the main body,
The structure of the cartridge is illustrated by a chain double-dashed line.

In Fig. 3, A, B and C are respectively a flow rate setting part, a temperature setting part, a hot water control part, and 2 is a generally cylindrical body, and a female screw 3 is engraved at the left end of the body. A circumferential slit-shaped hot water inflow groove 4 is provided in a part of the outer peripheral surface of the above, and a similar slit-like water inflow groove 5 is provided slightly to the right thereof. Reference numeral 6 is a discharge port formed in the body 2. 7 is a flow rate adjusting shaft, and a male screw 8 is engraved on the right side thereof.
And is screwed into the female screw 3 of the body 2, and the female screw 3 and the male screw 8 constitute a first screw mechanism 9. Reference numeral 10 denotes a flow rate adjusting handle fixed to the left end of the flow rate adjusting shaft 7. When the handle is rotated in the forward or reverse direction, the flow rate adjusting shaft 7 simultaneously rotates and moves forward or backward in the right or left direction in the figure. Reference numeral 11 denotes a movable stopper body having a bottomed cylindrical shape, which is fitted inside the body 2 so as to be movable left and right, and a bottom portion at the left end is in contact with the right end of the flow rate adjusting shaft 7. Reference numeral 11a denotes an outlet formed in the outer periphery of the movable stopper 11, and 12 denotes a hot water-side movable sheet fixed to the right end of the movable stopper 11, to which an annular rubber 12a is fitted. 13 is a movable valve,
The outer periphery of the cylindrical portion is fitted inside the body 2 and is arranged to be movable left and right. A fixed seat 14 on the water side is fixed in the body 2 with its seat surface facing the right end of the movable valve 13. 15 is a spindle case, O ring
It is fitted to the right end of the body 2 via 16, and a temperature adjusting shaft 17 is fitted to the right end of the body 2 in such a manner that the temperature adjusting shaft 17 can rotate and its movement in the axial direction (left and right direction in the drawing) is restricted. 18 is the temperature control axis 17
The temperature control handle is fixed to the, and 19 is a control body that has a generally cylindrical shape with a bottom.A male screw 20 is engraved on the outer periphery of the control body, and a female screw 21 engraved on the inner periphery of the spindle case 15 is screwed on. The male screw 20 and the female screw 21 form a second screw mechanism 22. The temperature control shaft 17 is fitted by a serration mechanism at the center of the bottom of the right end of the control body 19, and the temperature control handle is provided.
When the temperature control shaft 17 and the temperature control handle 18 are rotated in the forward and reverse directions when the 18 is rotated in the forward and reverse directions, the control body 19 also rotates in the forward and reverse directions at the same time, and the control mechanism 19 moves forward and backward by the action of the screw mechanism 22. twenty three
Is a stopper body slidably fitted inside the control body 19,
It is constantly urged to the left by the relief spring 24. Reference numeral 25 denotes a ring fitted in a groove on the inner circumference of the control body 19, and limits the stopper body 23 so as not to protrude from the control body 19 to the left. Reference numeral 26 denotes a thermostat (temperature-sensitive stretchable body), in which a wax having a large coefficient of thermal expansion is built in the case 26a, and when the wax expands due to a temperature rise, the rod 26b works to protrude more rightward from the case 26a. The movable valve 13 is press-fitted and fixed to a case 26a of the thermostat 26. The thermostat 26, as shown,
A return spring 27 fitted between the case 26b and the movable stopper 11 is biased rightward so that the right end of the rod 26b contacts the center of the stopper 23.
Reference numeral 28 is a mixing chamber formed inside the movable valve 13 and the movable stopper 11.

The male screw 8 and the female screw 3 that form the first screw mechanism 9 and the male screw 20 and the female screw 21 that form the second screw mechanism 22 are chamfered at the chamfering angle of 60 ° at the end of each screw. Moreover, both ends of the male screw 8 are formed to have a diameter substantially equal to the root diameter of the male screw. Both ends of the male screw 20 have a diameter slightly smaller than the root diameter of the male screw. Female thread 3 and 21
And the diameters of both ends thereof are approximately the same as the root diameters of the female threads 3 and 21, respectively.

FIG. 1 shows an enlarged detail of the left end portion of the male screw 20 engraved on the outer periphery of the control body 19.
Since the angle is as small as 60 °, it can be seen that the outer diameter portion of the thread at the tip of the screw is relatively thick as indicated by reference numeral 20a. Although the right end of the male screw 20 and both ends of the male screw 8 are not shown in the detail enlarged view, the outer diameter portion of the thread is similarly thick.

FIG. 2 is a cross-sectional view enlarging and illustrating a part of the left end of the female screw 21. The left end of the screw is chamfered at a chamfering angle of 60 °, and the diameter D ₁ of the left end of the screw is the root diameter D of the screw. It is almost the same as ₂ . By doing this, the thread at the left end is code 21.
As shown in a, the wall thickness is relatively thick. Female thread 21
Although not shown in detail on the right end of FIG. 2 or the left and right ends of the male screw 3, the outer diameter portion of the screw thread is similarly thickened.

 Next, the operation of the above embodiment will be described.

When the flow rate adjusting handle 10 in the flow rate setting unit A of FIG. 3 is rotated in the water stop direction to advance the flow rate adjusting shaft 7 to the right in the figure, the movable plug 11 moves to the right against the return spring 27. Then, the rubber 12a of the movable seat 12 comes into close contact with the left end of the movable valve 13 to block the hot water flowing from the hot water inflow groove 4, and in this state the movable valve 13 moves to the right and its right end is fixed to the water side. It comes into close contact with the sheet 14, blocks the inflow of water from the water inflow groove 5, and shuts off the supply of hot water to stop water.

When the flow rate adjusting handle 10 is rotated in the discharge direction from this water stopped state, the movable plug body 11 is retracted to the left in the figure by the urging force of the return spring 27, and the rubber 12 of the movable seat 12 is moved.
The a is separated from the left end of the movable valve 13, and the hot water from the hot water inflow groove 4 flows into the mixing chamber 28. Due to the inflow of this hot water, the wax of the thermostat (temperature sensitive elastic body) 26 expands, and the rod 26
Since b projects rightward from the case 26a and the right end of the rod 26b contacts the stopper body 23 of the temperature setting section B, the case 26a moves leftward and the movable valve 13 fixed to the case 26a. Moves to the left in the figure. By this movement, the right end of the movable valve 13 separates from the water-side fixed seat 14, water flows into the mixing chamber 28 from the water inflow groove 5, and hot water and water are mixed in the mixing chamber 28. This mixing temperature is thermostat 26
Is detected, and the movable valve 13 is operated so as to reach the temperature set by the temperature setting section B, and the hot water control section C controls the hot water and the amount of water flowing from both the inflow grooves 4 and 5. 29 is the hot water inflow groove 4
A check valve provided upstream of the valve allows only the flow in the hot water supply direction.

The hot water whose temperature has been adjusted in this manner is discharged from the discharge port 27 through the discharge port 6.

When rotating the flow rate adjusting handle 10 of the flow rate setting unit or the temperature adjusting handle 18 of the temperature setting unit, the male screws 8 and 20 of the screw mechanisms 9 and 22 rotate together with the handle, and the female screws 3 and 21.
Rotating relative to each other and advancing and retracting in the axial direction to change the flow rate and the set value of temperature, in the present invention, the chamfering angle of each screw is relatively small and set to around 60 °, and the screw end Since the diameter is set to be less than or equal to the root diameter of the thread for male threads and greater than or equal to the root diameter of the threads for female threads, the wall thickness of the threads at the end of the thread is relatively large, and it is not possible to use it during transportation at the component stage. There is no risk that the thread edge will be deformed by hitting a part, and burrs during machining are less likely to occur. Therefore, the operation for setting the flow rate and the temperature is made smooth, and the operation feeling is improved. The diameter of the male screw tip is 1 to 0.5 times the thread root diameter.
The diameter of the tip of the female screw may be determined to be 1 to 1.5 times the thread root diameter. Also, the smaller the chamfering angle of the screw tip, the thicker the screw thread can be made.However, if the chamfering angle is made smaller, the axial length of the effective screw part becomes shorter. It is preferable to set it to 90 ° or less because the thickness of the product becomes thin and deformation occurs, and burrs are easily generated during processing.

In each screw mechanism, the chamfering angle and the diameter of the screw end portion are configured as described above so that either the male screw or the female screw may be configured as described above. By doing so, the yield can be further improved.

[Effect of device]

Since the hot and cold water mixing valve of the present invention is configured as described above, there is no risk of the thread outer diameter portion of the screw being deformed, and fine flow rate setting and temperature setting operations can be performed smoothly and with a good feeling.
It improves the yield of the hot and cold water mixing valve in the sensitive test and contributes to the quality of the operation feeling.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an enlarged cross-sectional view of a part of a male screw, FIG. 2 is an enlarged vertical cross-sectional view of a part of a female screw, and FIG. FIG. 4 is a vertical cross-sectional view showing a cartridge inserted into the outer shell of the main body, and FIG. 4 is an enlarged vertical cross-sectional view of a part of the male screw in the prior art. 3,21 …… Female screw, 8,20 …… Male screw, 9,22 …… Screw mechanism,
10 …… Flow rate adjustment handle, 13 …… Movable valve, 18 …… Temperature control handle, 26 …… Thermostat

Claims (1)

(57) [Scope of utility model registration request] 1. A first screw mechanism (9) interlocking with a flow rate adjusting handle (10) and a second screw mechanism interlocking with a temperature adjusting handle (18).
And a screw mechanism (22), and the movable valve (13) is moved by the thermostat (26) to separate the movable valve (13) from the hot water side seat (12) and the water side seat (14). In the hot and cold water mixing valve for controlling the temperature by controlling the temperature, the male screw (8, 20) of the first screw mechanism (9) or the second screw mechanism (22)
And / or the end of the internal thread (3,21) with a chamfer angle.
A hot and cold water mixing stopper characterized in that the diameter of the male screw tip is set to 30 ° to 90 ° and the diameter of the male screw tip is set to be equal to or smaller than the root diameter of the screw, and the diameter of the female screw tip is set to be equal to or larger than the root diameter of the screw.