CN212407753U

CN212407753U - Temperature control head

Info

Publication number: CN212407753U
Application number: CN202021260174.9U
Authority: CN
Inventors: 郑宇�
Original assignee: Taizhou Zhongzhan Hvac Technology Co ltd
Current assignee: Taizhou Zhongzhan Hvac Technology Co ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-01-26
Anticipated expiration: 2030-07-01

Abstract

The utility model provides a temperature control head belongs to temperature control device technical field. It has solved the problem of current temperature control head easy damage. This temperature control head has the casing of cavity including inside, the downside of casing runs through and has seted up the mouth that stretches out, upper portion in the cavity is provided with temperature-sensing element, temperature-sensing element's downside has inside recessed inflation hole, and temperature control head still includes ejector pin, lower ejector pin, excessive pressure spring and return spring, and it is downthehole that the upper end of going up the ejector pin stretches into the inflation, and the lower extreme outside of last ejector pin is located to the ejector pin cover down, and the lower extreme of lower ejector pin can stretch into in the mouth stretches out, and the both ends of excessive pressure spring support respectively to lean on last ejector pin and lower ejector pin, and return spring's both ends support respectively to lean on shells inner wall and lower ejector pin and make down the ejector pin can remove to the temperature-sensing element direction under the effect of elasticity, and the ventilation hole that is linked together with the cavity. The temperature control head has the advantage of difficult damage.

Description

Temperature control head

Technical Field

The utility model belongs to the technical field of temperature control device, a temperature control head is related to.

Background

The temperature control head is a common temperature control device, is usually matched with the valve body, and automatically controls the opening degree of the valve body by sensing temperature.

When the temperature of the controlled medium changes, the volume of the temperature sensing element in the temperature control head expands or contracts along with the temperature change, specifically, when the temperature of the controlled medium is higher than a set value, the temperature sensing element expands to push the valve element to move downwards and close the valve, so that the flow of the heating medium is reduced; on the contrary, when the temperature of the controlled medium is lower than the set value, the temperature sensing element contracts, the return spring pushes the valve core to move upwards and open the valve, and the flow of the heating medium is increased.

At present, after a valve is closed easily in the use process of the traditional temperature control head, a temperature sensing element in the temperature control head continues to expand to cause the valve rod to continue to be pressed, so that the temperature control head is damaged or the sensitivity is reduced for a long time, and the normal work of the valve is greatly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that prior art exists, provide a temperature control head, solved the easy problem of damaging of current temperature control head.

The purpose of the utility model can be realized by the following technical proposal:

the temperature control head comprises a shell with a cavity inside, an extension opening is arranged at the lower side of the shell in a penetrating way, the upper part in the cavity is provided with a temperature sensing element, the lower side surface of the temperature sensing element is provided with an expansion hole which is concave inwards, it is characterized in that the temperature control head also comprises an upper ejector rod, a lower ejector rod, an overpressure spring and a return spring, the upper end of the upper ejector rod extends into the expansion hole, the lower ejector rod is sleeved outside the lower end of the upper ejector rod, the lower end of the lower ejector rod can extend into the extension port, two ends of the overpressure spring are respectively abutted against the upper ejector rod and the lower ejector rod, two ends of the return spring are respectively abutted against the inner wall of the shell and the lower ejector rod and enable the lower ejector rod to move towards the temperature sensing element under the action of elastic force, the top of casing still runs through to set up the ventilation hole that is linked together with the cavity, the quantity in ventilation hole is the several and around the central equipartition at casing top.

When the temperature control head is not used, the temperature sensing element contracts, the lower ejector rod moves upwards under the elastic force of the return spring, the upper ejector rod is jacked up through the overpressure spring, and the valve core also rises along with the lower ejector rod to open the valve. When the temperature of the controlled medium is higher than a set value, the temperature sensing element expands to push the upper ejector rod out of the expansion hole, namely, out of the lower part, the upper ejector rod acts on the lower ejector rod through the overpressure spring, so that the lower ejector rod overcomes the elastic force of the return spring to move downwards, the valve is driven to move downwards and close the valve, or the opening of the valve is reduced. When the valve is completely closed, the temperature sensing element still continues to expand, the elastic force of the return spring is gradually increased, the displacement of the lower ejector rod is reduced, meanwhile, a plurality of ventilation holes in the top of the shell rapidly dissipate heat at the temperature sensing element, and damage to the temperature control head is reduced or even avoided.

In the temperature control head, the outer side of the lower end of the upper ejector rod is provided with a convex annular hook, the lower ejector rod is cylindrical, the inner side of the upper end of the lower ejector rod is provided with a convex annular convex edge, and the upper ejector rod moves upwards under the action of the overpressure spring and enables the hook to be abutted against the lower side surface of the convex edge.

In foretell temperature control head, run through on the lateral wall of lower ejector pin and set up the shape groove, the shape groove is rectangular form, and its upper end is located the up end of lower ejector pin, its lower extreme with have the interval between the lower terminal surface of lower ejector pin, and the length of shape groove with the ratio of the axial length of lower ejector pin is greater than 1/2, the quantity of shape groove is the several and follows the circumference equipartition of lower ejector pin, the outside of couple still has convex guide block, the guide block stretches into in the shape groove, the lower extreme inboard of lower ejector pin has convex spring holder, the lower extreme of excessive pressure spring supports and leans on the spring holder, run through on the spring holder and set up the several through-hole.

In the temperature control head, the inner side of the upper end of the lower ejector rod is provided with a conical guide surface.

In the temperature control head, the spring seat is further provided with a long-rod-shaped guide part extending towards the upper ejector rod, and the overpressure spring is sleeved outside the guide part.

In the temperature control head, the outer side of the upper end of the lower ejector rod is provided with a protruding blocking edge in a circular ring shape, the inner wall of the shell is provided with a protruding blocking shoulder in a circular ring shape, the outer side of the lower ejector rod is sleeved with the return spring, and two ends of the return spring are respectively abutted against the blocking edge and the blocking shoulder.

Compared with the prior art, this temperature control head passes through overpressure spring and return spring's structure setting for the valve is closed back temperature-sensing element and is continued expanded effort and weakened or offset by return spring crescent elasticity, and the several ventilation hole at cooperation casing top realizes rapid cooling simultaneously, avoids the heat of piling up in the casing to cause the influence to temperature-sensing element, makes temperature-sensing element can resume normal operating condition rapidly, reduces and avoids temperature-sensing element to the excessive extrusion of case even, has avoided the damage of temperature control head.

Drawings

Fig. 1 is an exploded view of the present temperature control head.

In the figure, 1, a housing; 2. a temperature sensing element; 3. an ejector rod is arranged; 4. a lower ejector rod; 5. an overpressure spring; 6. a return spring; 7. a vent hole; 8. hooking; 9. a convex edge; 10. a deformation groove; 11. a guide block; 12. a guide surface; 13. a guide portion; 14. and (6) blocking edges.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the temperature control head comprises a shell 1 with a cavity inside, an extending opening is formed in the lower side of the shell 1 in a penetrating mode, a plurality of ventilation holes 7 communicated with the cavity are formed in the upper end of the shell 1 in a penetrating mode, the top surface of the shell 1 is circular, and the ventilation holes 7 are uniformly distributed around the center of the top of the shell 1.

The cavity is also internally provided with a temperature sensing element 2, an upper ejector rod 3, a lower ejector rod 4, an overpressure spring 5 and a return spring 6. The temperature sensing element 2 is arranged at the upper part in the cavity, the lower side surface of the temperature sensing element 2 is provided with an expansion hole which is concave inwards, the upper ejector rod 3 is cylindrical, and the upper end of the upper ejector rod extends into the expansion hole. The lower ejector rod 4 is cylindrical and is sleeved outside the lower end of the upper ejector rod 3, and the lower end of the lower ejector rod 4 can extend into the extension port. The two ends of the overpressure spring 5 are respectively abutted against the upper ejector rod 3 and the lower ejector rod 4, and the two ends of the return spring 6 are respectively abutted against the inner wall of the shell 1 and the lower ejector rod 4 and enable the lower ejector rod 4 to move towards the temperature sensing element 2 under the action of elasticity.

Specifically, the outer side of the lower end of the upper ejector rod 3 is provided with a hook 8 protruding in a circular ring shape, the outer side surface of the hook 8 is provided with a plurality of guide blocks 11 protruding in a block shape, and the plurality of guide blocks 11 are uniformly distributed along the circumferential direction. The inner side of the upper end of the lower mandril 4 is provided with a convex annular convex edge 9, and the upper side surface of the convex edge 9 is a conical guide surface 12. The side wall of the lower ejector rod 4 is provided with a deformation groove 10 in a penetrating manner, the deformation groove 10 is long, the upper end of the deformation groove 10 is located on the upper end face of the lower ejector rod 4, a distance is reserved between the lower end of the deformation groove and the lower end face of the lower ejector rod 4, the ratio of the length of the deformation groove 10 to the axial length of the lower ejector rod 4 is larger than 1/2, and the deformation grooves 10 are distributed uniformly in the circumferential direction of the lower ejector rod 4. Guide block 11 in the 8 outsides of couple stretches into in the deformation groove 10 and plays the guide effect, and the lower extreme inboard of lower ejector pin 4 has convex spring holder, runs through on the spring holder and has seted up the several through-hole, still has the guide part 13 that is the stock form that stretches out in the ejector pin 3 that makes progress on the spring holder, and 5 covers of overvoltage spring are established in the outside of guide part 13, and the lower extreme of overvoltage spring 5 supports and leans on the spring holder, and the upper end of overvoltage spring 5 supports and leans on last ejector pin 3. Here, when cup jointing between upper ejector pin 3 and the lower ejector pin 4, along axial extrusion upper ejector pin 3 and lower ejector pin 4 in opposite directions for the upper portion of lower ejector pin 4 outwards expands, and couple 8 of upper ejector pin 3 slides into the downside of protruding edge 9 along guide surface 12, realizes cup jointing and spacing between them, moves up and makes couple 8 and the downside of protruding edge 9 offset under the effect of overpressure spring 5.

The outside of the upper end of the lower ejector rod 4 is also provided with a protruding blocking edge 14 in a circular ring shape, the inner wall of the shell 1 is provided with a protruding blocking shoulder in a circular ring shape, the return spring 6 is sleeved outside the lower ejector rod 4, and two ends of the return spring respectively abut against the blocking edge 14 and the blocking shoulder, so that the lower ejector rod 4 has the upward moving trend.

When the temperature control head is not used, the temperature sensing element 2 contracts, the lower ejector rod 4 moves upwards under the action of the elastic force of the return spring 6, the upper ejector rod 3 is jacked up through the overpressure spring 5, and the valve core also rises along with the lower ejector rod 4 to open the valve. When the temperature of the controlled medium is higher than a set value, the temperature sensing element 2 expands to push the upper ejector rod 3 out of the expansion hole, namely, out of the lower part, and the upper ejector rod 3 acts on the lower ejector rod 4 through the overpressure spring 5, so that the lower ejector rod 4 overcomes the elastic force of the return spring 6 to move downwards, and drives the valve to move downwards and close the valve or reduce the opening of the valve. When the valve is completely closed, the temperature sensing element 2 still continues to expand, the elastic force of the return spring 6 is gradually increased, the displacement of the lower ejector rod 4 is reduced, meanwhile, a plurality of ventilation holes 7 at the top of the shell 1 quickly dissipate heat at the temperature sensing element 2, and damage to the temperature control head is reduced or even avoided.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The temperature control head comprises a shell (1) with a cavity inside, wherein an extending opening is formed in the lower side of the shell (1) in a penetrating mode, a temperature sensing element (2) is arranged on the upper portion in the cavity, and an inward concave expansion hole is formed in the lower side surface of the temperature sensing element (2), and the temperature control head is characterized by further comprising an upper ejector rod (3), a lower ejector rod (4), an overpressure spring (5) and a return spring (6), wherein the upper end of the upper ejector rod (3) extends into the expansion hole, the lower ejector rod (4) is sleeved on the outer side of the lower end of the upper ejector rod (3), the lower end of the lower ejector rod (4) can extend into the extending opening, two ends of the overpressure spring (5) respectively abut against the upper ejector rod (3) and the lower ejector rod (4), two ends of the return spring (6) respectively abut against the inner wall of the shell (1) and the lower ejector rod (4) and enable the lower ejector rod (4) to move towards the temperature sensing element (2), the top of casing (1) still runs through and sets up ventilation hole (7) that are linked together with the cavity, the quantity in ventilation hole (7) is the several and around the center equipartition at casing (1) top, the lower extreme outside of going up ejector pin (3) has the protrusion and is ring form couple (8), ejector pin (4) are cylindricly down, and the upper end inboard of ejector pin (4) has the convex protruding edge (9) that is ring form down, it shifts up and makes to go up ejector pin (3) under the effect of overpressure spring (5) couple (8) with protruding downside along (9) offsets and leans on.

2. The temperature control head according to claim 1, characterized in that the side wall of the lower mandril (4) is provided with a deformation groove (10) in a penetrating way, the deformation groove (10) is in a long strip shape, the upper end of the upper part is positioned on the upper end surface of the lower mandril (4), the lower end of the upper part is spaced from the lower end surface of the lower mandril (4), and the ratio of the length of the deformation groove (10) to the axial length of the lower ejector rod (4) is more than 1/2, the number of the deformation grooves (10) is a plurality and the deformation grooves are uniformly distributed along the circumferential direction of the lower ejector rod (4), the outer side of the hook (8) is also provided with a convex guide block (11), the guide block (11) extends into the deformation groove (10), the inner side of the lower end of the lower ejector rod (4) is provided with a convex spring seat, the lower end of the overpressure spring (5) is abutted against the spring seat, and the spring seat is provided with a plurality of through holes in a penetrating manner.

3. Temperature control head according to claim 2, characterized in that the inner side of the upper end of the lower ejector pin (4) has a conical guide surface (12).

4. The temperature control head according to claim 2, characterized in that the spring seat is further provided with a guide part (13) which is in a long rod shape and extends towards the upper ejector rod (3), and the overpressure spring (5) is sleeved outside the guide part (13).

5. The temperature control head according to any one of claims 1 to 4, wherein a protruding annular blocking edge (14) is arranged on the outer side of the upper end of the lower ejector rod (4), a protruding annular blocking shoulder is arranged on the inner wall of the shell (1), the return spring (6) is sleeved on the outer side of the lower ejector rod (4), and two ends of the return spring respectively abut against the blocking edge (14) and the blocking shoulder.