Constant-temperature water mixing valve

Abstract

The utility model provides a constant-temperature water mixing valve, and belongs to the technical field of valves. The problem that the set outlet water temperature is changed due to misoperation is solved. The valve comprises a valve body and a thermosensitive element, a screw rod is in threaded connection with the upper end of the valve body, the upper end of the thermosensitive element abuts against the screw rod, the upper end of the valve body is sleeved with a protective cover, the protective cover is connected with a connecting screw, the top of the screw rod is provided with a connecting part with a non-circular cross section, and the bottom of the protective cover abuts against the valve body. The top wall of the inner side of the protective cover protrudes downwards to form a protruding part, the top of the protective cover is provided with a containing hole formed in the protruding part, the head of the connecting screw is located in the containing hole, the rod of the connecting screw penetrates through the bottom of the protruding part and is in threaded connection with the interior of the connecting part, and a gap is formed between the bottom face of the head of the connecting screw and the bottom wall of the containing hole. The containing hole is a non-circular hole, and the shape of the containing hole is matched with that of the connecting part. The device has the advantages that the set outlet water temperature is not easy to change due to misoperation, and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field relates to constant temperature mixing valve. BACKGROUND

[0002] Constant temperature mixing valve is the supporting product of the warm system, it can form the warm water of the water temperature suitable with the cold water and hot water to the convenience of people direct use, it is widely used in water heater or the warm and ventilated equipment such as floor heating. For example the mixing valve disclosed in patent application no. 202122758826.2, it includes valve body, temperature bag (also known as thermal element) and valve cover, the valve body has valve seat, the valve cover is screwed on the top of the valve body, the left side of the valve body is mixed water outlet, the right side of the valve body is hot water inlet, the bottom of the valve body is cold water inlet, the valve seat is connected to the hot water inlet below and the mixed water outlet above, the valve seat is provided with a cylindrical valve core, the inner wall of the valve core has a plurality of circumferentially distributed rib plates, each rib plate has an axial extension and extends out of the lower part of the valve core, each extension is inserted into the inner end of the cold water inlet, and the hot water liquid gap for connecting the hot water inlet is formed between each extension, the lower end of the temperature bag is axially inserted into the valve core, and the support structure is provided between the valve core and the temperature bag to support the temperature bag, the upper end of the temperature bag is axially inserted into the valve cover, and the adjusting structure is provided at the valve cover to form abutment on the upper end of the temperature bag, and the spring one is provided in the cold water inlet to provide elastic support for the valve core. Among them, the adjusting structure includes a lead screw connected with the valve cover, the outer end of the lead screw extends out of the valve cover and is fixedly connected with a hand wheel, the upper end of the temperature bag is provided with a compression cap, the inner end of the lead screw is provided with an axial blind hole, the blind hole is provided with a spring two, and the spring two provides elastic force to compress the upper end of the temperature bag. Cold water enters the valve body from the cold water inlet, and then flows into the upper part of the valve seat between the rib plates, hot water enters the lower part of the valve seat from the hot water inlet, and then enters the valve core from the hot water liquid gap, and then flows into the upper part of the valve seat between the rib plates, cold water and hot water are mixed in the upper part of the valve seat, and then water is discharged from the mixed water outlet, cold water directly passes through the inside of the valve core and does not impact hot water, cold water with slightly greater pressure will drive hot water to mix and flow out, the rib plate also plays a guiding role, and the water outlet efficiency is high; when the temperature of hot water rises or falls, the temperature bag expands or shrinks, the spring one drives the valve core to axially ascend or descend, the extension amount of the extension into the inner end of the cold water inlet is changed, the opening degree of the hot water liquid gap is changed, and the temperature of the mixed water outlet is constant.

[0003] In addition, the water mixing valve also has the function of being able to adjust the set water temperature, specifically, the hand wheel is rotated by the user to drive the screw rod to rotate, and the spring II is extruded along with the rotation of the screw rod, and the temperature bag is pushed to move through the compression cap, so that the initial hot water liquid gap size can be changed, so that the setting of the water temperature is adjusted. However, the hand wheel is directly exposed to the outside, and the hand wheel is rotated to change the set water temperature, and the water mixing valve is usually installed in a more obvious position for convenient use, which means that it is easy to be operated by others, so the above-mentioned problem of being easily misoperated to change the set water temperature exists. Content of the utility model

[0004] The utility model discloses a constant temperature water mixing valve, which solves the problem of being easily misoperated to change the set water temperature.

[0005] The utility model discloses a constant temperature water mixing valve, which solves the problem of being easily misoperated to change the set water temperature.

[0006] The utility model discloses a constant temperature water mixing valve, which solves the problem of being easily misoperated to change the set water temperature.

[0007] When installed, the protective cover is sleeved on the upper end of the valve body, and then the connecting screw is put into the accommodating hole, the rod part of the connecting screw is threaded into the connecting part on the top of the screw rod, and the head of the connecting screw can block the protective cover, so that the protective cover cannot fall off from the upper end of the valve body, but the protective cover has no connection with the screw rod in the circumferential direction. After such connection, the protective cover is in a state of free rotation relative to the screw rod, so that the protective cover is idle when rotating, and it will not rotate with the screw rod, that is, the protective cover can protect the screw rod from being rotated by others to change the preset water temperature, so as to ensure that the water temperature does not change uncontrollably. Especially, after installation is completed, there is a gap between the bottom surface of the head of the connecting screw and the bottom wall of the accommodating hole in the case where the bottom of the protective cover abuts against the valve body, so that the protective cover is equivalent to being in a floating state in the axial direction, so that even if someone rotates the protective cover, the connecting screw will not be rotated, ensuring that the connecting screw will not be loose. Similarly, due to the floating state of the protective cover in the axial direction, the screw rod will not be uncontrollably rotated due to friction when the protective cover is rotated.

[0008] When the preset water temperature needs to be adjusted, the user only needs to remove the connecting screw and take the protective cover off the upper end of the valve body. Since the accommodating hole is a non-circular hole and the shape of the accommodating hole matches the connecting part, after the protective cover is taken off the valve body, the user can directly invert the protective cover and sleeve it outside the connecting part of the screw rod through the accommodating hole, so that the inverted protective cover is circumferentially fixed with the screw rod, and the user can rotate the inverted protective cover to drive the screw rod. That is, the inverted protective cover can also be used as a tool for the user to operate the screw rod, without the need for additional tools.

[0009] In the thermostatic mixing valve, the protective cover is circumferentially provided with a plurality of ribs, the ribs are strip-shaped along the axial direction of the protective cover, and the ribs are formed by the outward protrusion of the inner top wall of the protective cover.

[0010] The formation of the ribs can increase the structural strength of the protective cover, ensuring that the protective cover will not be deformed by extrusion during transportation.

[0011] In the thermostatic mixing valve, a plurality of reinforcing pieces are integrally connected circumferentially between the protruding part and the inner top wall of the protective cover.

[0012] The plurality of reinforcing pieces integrally connected circumferentially between the protruding part and the inner top wall of the protective cover can increase the strength of the protruding part and improve the structural reliability when the protective cover is used as a tool after being removed from the valve body and inverted to be sleeved outside the connecting part of the screw rod.

[0013] In the thermostatic mixing valve, the protective cover is a nylon piece.

[0014] The nylon material has high strength and toughness, and the protective cover made of the nylon material can ensure durability.

[0015] In the thermostatic mixing valve, the cross section of the connecting portion is a regular hexagon.

[0016] The cross section of the connecting portion is a regular hexagon, so even a conventional tool such as a wrench can be used.

[0017] Compared with the prior art, the thermostatic mixing valve has the following advantages:

[0018] 1. A protruding portion is arranged on the inner top wall of the protective cover, a receiving hole is arranged in the protruding portion, the head of the connecting screw is located in the receiving hole, and the rod of the connecting screw is screwed into the connecting portion through the bottom of the protruding portion. In this way, the protective cover can rotate freely relative to the screw rod, and the protective cover is idle when it rotates, i.e., the protective cover cannot rotate with the screw rod, which means that the protective cover can protect the screw rod from being rotated by others to change the preset water temperature, so that the water temperature cannot change uncontrollably.

[0019] 2. The cross section of the connecting portion arranged on the top of the screw rod is non-circular, and the shape of the receiving hole arranged on the top of the protective cover is the same as that of the connecting portion. In this way, the protective cover can be used as a tool for operating the screw rod when it is removed from the valve body and is inverted and sleeved on the connecting portion of the screw rod. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the thermostatic mixing valve.

[0021] Figure 2 is a partial exploded view of the thermostatic mixing valve.

[0022] Figure 3 is a sectional view of the thermostatic mixing valve.

[0023] Figure 4 is a perspective view of the protective cover.

[0024] Figure 5 is a sectional view of the protective cover when it is removed and inverted and sleeved on the screw rod.

[0025] In the figure, 1, valve body; 1a, hot water inlet; 1b, cold water inlet; 1c, mixing chamber; 1d, water outlet; 2, thermal element; 3, thermostatic valve flap; 4, flow guide; 4a, flow guide hole; 5, supporting spring; 6, screw rod; 6a, connecting part; 6b, connecting hole; 7, protective cover; 7a, protruding part; 7a1, through hole; 7b, accommodating hole; 7c, protruding rib; 7d, reinforcing sheet; 8, connecting screw. DETAILED DESCRIPTION

[0026] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the drawings, but the present application is not limited to these embodiments.

[0027] As shown in Figure 1 , Figure 2 and Figure 3 , the thermostatic mixing valve comprises a valve body 1, the side of the valve body 1 is provided with a hot water inlet 1a and a cold water inlet 1b, the valve body 1 has a mixing chamber 1c therein, the hot water inlet 1a and the cold water inlet 1b are both in communication with the mixing chamber 1c, and the communication position of the hot water inlet 1a with the mixing chamber 1c is located below the communication position of the cold water inlet 1b with the mixing chamber 1c, and the bottom of the valve body 1 has a water outlet 1d in communication with the mixing chamber 1c. A thermal element 2 capable of moving up and down is arranged in the valve body 1 in the vertical direction, the middle part of the thermal element 2 is fixedly connected with a thermostatic valve flap 3 outside, the thermostatic valve flap 3 is located in the mixing chamber 1c, and the thermostatic valve flap 3 moves up and down to change the communication opening degree between the two connecting ends and the mixing chamber 1c. A flow guide 4 is arranged in the lower end of the valve body 1, the flow guide 4 is in the shape of a cylinder with an open upper end, the bottom of the flow guide 4 is provided with a flow guide hole 4a, the inner wall of the flow guide hole 4a is protrusively provided with a plurality of flow guide pieces, the flow guide pieces are distributed in the circumferential direction, and the lower end of the thermal element 2 is located in the flow guide hole 4a and the flow guide pieces surround the lower end of the thermal element 2 outside. A supporting spring 5 is arranged in the flow guide 4, the lower end of the supporting spring 5 abuts against the flow guide 4, and the upper end of the supporting spring 5 abuts against the thermal element 2. A screw rod 6 is threadedly connected in the upper end of the valve body 1, and the upper end of the thermal element 2 abuts against the screw rod 6.

[0028] In use, the hot water inlet end 1a is connected to a hot water source and the cold water inlet end 1b is connected to a cold water source, so that hot water and cold water are mixed in the mixing chamber 1c and then flow out from the outlet 1d at the bottom of the valve body 1. When the temperature of the hot water rises, the upper end of the thermosensitive element 2 abuts against the screw rod 6, so that the thermosensitive element 2 is stretched and pulls the thermostat valve disc 3 to move downwards (at this time, the supporting spring 5 is compressed), thus reducing the opening degree of the communication between the hot water inlet end 1a and the mixing chamber 1c and increasing the opening degree of the communication between the cold water inlet end 1b and the mixing chamber 1c, so as to ensure that the temperature of the mixed water remains constant. After the use of cold water and hot water is cut off, the thermosensitive element 2 is contracted to the original length and pulls the thermostat valve disc to move upwards under the elastic force of the supporting spring 5, so that the opening degree of the communication between the hot water inlet end 1a and the mixing chamber 1c and the opening degree of the communication between the cold water inlet end 1b and the mixing chamber 1c return to the initial state.

[0029] In addition, the screw rod 6 is screwed in the upper end of the valve body 1, and the upper end of the thermosensitive element 2 abuts against the screw rod 6, so that when the screw rod 6 moves downwards, the thermosensitive element 2 is pushed to move downwards against the action of the supporting spring 5, and the downward movement of the thermosensitive element 2 means that the thermostat valve disc 3 moves downwards, thus changing the initial opening degree of the communication between the hot water inlet end 1a and the mixing chamber 1c and the initial opening degree of the communication between the cold water inlet end 1b and the mixing chamber 1c.

[0030] As Figure 1 , Figure 2 and Figure 3As shown, the upper end of the screw rod 6 extends out of the valve body 1, and the top of the screw rod 6 is provided with a connecting portion 6a having a non-circular cross section, and in practice, the cross section of the connecting portion 6a is a regular hexagon. The upper end of the valve body 1 is sleeved with a protective cover 7, the bottom of the protective cover 7 abuts against the valve body 1, the inner top wall of the protective cover 7 is provided with a protruding portion 7a protruding downward, the top of the protective cover 7 is provided with a receiving hole 7b opening into the protruding portion 7a, the protective cover 7 is connected with a connecting screw 8, the head of the connecting screw 8 is located in the receiving hole 7b, the bottom of the protruding portion 7a is provided with a through hole 7a1 communicating with the receiving hole 7b, the top of the screw rod 6 is provided with a connecting hole 6b, the rod of the connecting screw 8 passes through the through hole 7a1 of the bottom of the protruding portion 7a and is threadedly connected in the connecting hole 6b, and there is a gap between the bottom surface of the head of the connecting screw 8 and the bottom wall of the receiving hole 7b, the receiving hole 7b is a non-circular hole (specifically, an internal hexagonal hole), and the shape of the receiving hole 7b matches the connecting portion 6a. During installation, the protective cover 7 is sleeved on the upper end of the valve body 1, and then the connecting screw 8 is put into the receiving hole 7b, the rod of the connecting screw 8 passes through the through hole 7a1 of the bottom of the protruding portion 7a and is threadedly connected in the connecting hole 6b of the top of the screw rod 6, so that the head of the connecting screw 8 can block the protective cover 7, ensuring that the protective cover 7 cannot fall off from the upper end of the valve body 1, but the protective cover 7 has no circumferential connection with the screw rod 6. After such connection, the protective cover 7 is in a state of being able to rotate freely relative to the screw rod 6, so that the protective cover 7 is idle when rotating, and it cannot rotate with the screw rod 6, that is, the protective cover 7 can protect the screw rod 6 from being rotated by others to change the preset water temperature. In particular, after installation is completed, the gap between the bottom surface of the head of the connecting screw 8 and the bottom wall of the receiving hole 7b is provided in the case where the bottom of the protective cover 7 abuts against the valve body 1, so that the protective cover 7 is equivalent to being in a floating state along the axial direction, so that even if someone rotates the protective cover 7, the connecting screw 8 will not be rotated, ensuring that the connecting screw 8 will not be loose. Similarly, due to the floating state of the protective cover 7 along the axial direction, the screw rod 6 will not be uncontrollably rotated due to friction when the protective cover 7 is rotated. When the preset water temperature needs to be adjusted, the user only needs to remove the connecting screw 8 and take off the protective cover 7 from the upper end of the valve body 1. Since the receiving hole 7b is a non-circular hole and the shape of the receiving hole 7b matches the connecting portion 6a, after the protective cover 7 is taken off from the valve body 1, the user can directly invert the protective cover 7 and sleeve it outside the connecting portion 6a of the screw rod 6 (the state is shown in Figure 5 FIG. 6), so that the inverted protective cover 7 is circumferentially fixed with the screw rod 6, and the user can rotate the inverted protective cover 7 to drive the screw rod 6 to rotate. That is, the inverted protective cover 7 can also be used as a tool for the user to operate the screw rod 6, without the need for additional tools.

[0031] AsFigure 3 and Figure 4 As shown in the figure, the protective cover 7 is a nylon piece, and the protective cover 7 is provided with a plurality of convex ribs 7c in the circumferential direction, the convex ribs 7c are strip-shaped along the axial direction of the protective cover 7, and the convex ribs 7c are formed by the convex ribs 7c being protruded inward from the outside of the protective cover 7. The formation of the convex ribs 7c can increase the structural strength of the protective cover 7, and ensure that the protective cover 7 will not be extruded and deformed in the process of transportation. A plurality of reinforcing pieces 7d are integrally connected in the circumferential direction between the convex portion 7a and the inner side top wall of the protective cover 7, which can increase the strength of the convex portion 7a and improve the structural reliability of the protective cover 7 when it is used as a tool after being detached from the valve body 1 and inverted to be sleeved outside the connecting portion 6a of the lead screw 6.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A thermostatic mixing valve, comprising a valve body (1) and a thermal element (2) vertically disposed within the valve body (1), wherein a lead screw (6) is internally threaded to the upper end of the valve body (1), the upper end of the thermal element (2) abuts against the lead screw (6), a support spring (5) is abutted against the lower end of the thermal element (2), the upper end of the lead screw (6) extends out of the valve body (1), a protective cover (7) is sleeved on the upper end of the valve body (1), and a connecting screw (8) is connected to the protective cover (7), characterized in that, The top of the screw rod (6) is provided with a connecting part (6a) with a non-circular cross section, the bottom of the protective cover (7) abuts against the valve body (1), the inner top wall of the protective cover (7) is provided with a protruding part (7a) protruding downward, the top of the protective cover (7) is provided with a containing hole (7b) opening into the protruding part (7a), the head of the connecting screw (8) is located in the containing hole (7b), the rod of the connecting screw (8) passes through the bottom of the protruding part (7a) and is screwed into the connecting part (6a), there is a gap between the bottom surface of the head of the connecting screw (8) and the bottom wall of the containing hole (7b), the containing hole (7b) is a non-circular hole, the shape of the containing hole (7b) is matched with the connecting part (6a).

2. The thermostatic mixing valve of claim 1, wherein The protective cover (7) is provided with a plurality of convex ribs (7c) in the circumferential direction, the convex ribs (7c) are strip-shaped along the axial direction of the protective cover (7), and the convex ribs (7c) are formed by the protrusion of the outer side of the protective cover (7) inward.

3. The thermostatic mixing valve of claim 2, wherein The protruding part (7a) and the inner top wall of the protective cover (7) are integrally connected with a plurality of reinforcing sheets (7d) in the circumferential direction.

4. The thermostatic mixing valve according to claim 1 or 2 or 3, characterized in that The protective cover (7) is a nylon piece.

5. The thermostatic mixing valve of claim 1, wherein The cross section of the connecting part (6a) is a regular hexagon.

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