Low-temperature-resistant pressure gauge movement

Abstract

The utility model discloses a low temperature resistant pressure gauge movement, which relates to the technical field of pressure gauges and comprises a casing, a movement is arranged on the inner end face of the casing, a bottom cover plate is arranged on the rear portion of the movement and on the end face of the casing, and a heating wire and a control mechanism for controlling the heating wire to be opened or closed are mounted in the bottom cover plate. The control mechanism comprises a base, a temperature sensing assembly, a normally-closed microswitch and an electric contact, the normally-closed microswitch is kept in a closed state at the normal temperature, the metal pointer does not make contact with the electric contact, and the metal pointer rotates at the low temperature and achieves opening of the normally-closed microswitch with the electric contact. According to the utility model, the on / off of the heating wire is controlled through temperature change, the movement does not work at a low temperature limit, and can be automatically switched off after continuous heating, thereby preventing overheating of the movement caused by continuous heating, providing a good operation environment, and preventing various faults caused by low temperature or overheating from influencing the performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure gauge technical field especially relates to a low temperature resistance type pressure gauge movement. BACKGROUND

[0002] Pressure gauge is the elastic element as sensitive element, measures and indicates the instrument above ambient pressure, can be seen everywhere in the heat pipe network, oil and gas transmission, water and gas supply system, vehicle maintenance and repair factory and so on, because the elastic sensitive element of pressure gauge has very high mechanical strength and production convenient characteristics, make mechanical pressure gauge get more and more extensive application.

[0003] The file with the publication number CN218765712U discloses a low temperature resistance type pressure gauge movement, the utility model can start heating wire under low temperature environment, the temperature of the inner chamber of the shell is driven to rise by the heat generated, so that the movement is in the excellent performance working temperature range, provides a good running environment, reduces the damage rate and prolongs the service life. UTILITY MODEL CONTENTS

[0004] The utility model discloses a low temperature resistance type pressure gauge movement to solve the problems existing in the prior art.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A low temperature resistance type pressure gauge movement, including the shell, the inside end surface of the shell is provided with the movement, the rear of the movement and at the shell end surface is provided with the bottom cover plate, the inside of the bottom cover plate is installed with the electric heating wire and the control mechanism that controls the electric heating wire to open or close, the control mechanism includes the base, temperature sensing assembly, normally closed microswitch and electric contact point;

[0007] Among them, the base is installed on the bottom cover plate, the temperature sensing assembly includes the metal pointer, the electric contact point is connected to one end of the normally closed microswitch, the normally closed microswitch keeps closed state under normal temperature, the metal pointer does not contact the electric contact point, the metal pointer rotates and realizes normally closed microswitch opening with the electric contact point when low temperature.

[0008] Preferably, the base is fixedly connected with a bolt, and the base is locked on the inner side of the bottom cover plate through the bolt.

[0009] Preferably, the temperature sensing assembly further comprises a cylinder fixedly connected with the base, a rotatable rod rotatably arranged in the cylinder, a pin fixedly connected with an end of the rotatable rod, the metal pointer being mounted on the pin, and a bimetallic strip sleeved on the rotatable rod.

[0010] Preferably, the bimetallic strip is of a spring type, and one end of the bimetallic strip is fixedly connected with the rotatable rod.

[0011] Preferably, one end of the electric heating wire is connected to a positive pole of a power supply, the other end of the electric heating wire is connected to a common terminal of a normally closed micro switch, and the other end of the normally closed micro switch is connected to a negative pole of the power supply.

[0012] Preferably, a groove is formed in an inner ring of the bottom cover plate, and the electric heating wire is arranged in the groove.

[0013] Preferably, the bimetallic strip is welded or rolled by two metals with different thermal expansion coefficients, and the bimetallic strip detects a temperature range of -200 DEG C to 200 DEG C.

[0014] Preferably, the electric contact is fixedly connected with the base, and the position of the electric contact is set according to the type of the pressure gauge.

[0015] Compared with the prior art, the utility model has the advantages and positive effects that:

[0016] 1. In the application, the control mechanism controls the electric heating wire according to the ambient temperature, when the ambient temperature drops to a preset low temperature limit, the bimetallic strip is bent due to the two metals with different thermal expansion coefficients, drives the metal pointer to rotate and contact with the electric contact, thereby automatically connecting the power supply of the electric heating wire, the heat generated after the electric heating wire works, effectively improves the temperature of the inner cavity of the casing, provides a good operating environment for the movement, avoids the movement failure caused by low temperature.

[0017] 2. In the application, with the gradual increase of the temperature in the shell, the bimetallic strip is reversely bent, the metal pointer is away from the electric contact, the normally closed micro switch restores the closed state, and the electric heating wire stops working immediately, thereby effectively avoiding unnecessary energy consumption and preventing the movement overheating problem caused by continuous heating. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A three-dimensional structure schematic view of a low-temperature-resistant pressure gauge movement is provided for the utility model;

[0019] Figure 2 A partial explosion schematic view of a low-temperature-resistant pressure gauge movement is provided for the utility model;

[0020] Figure 3The utility model provides a kind of bottom cover plate structure schematic diagram of low temperature resistant pressure gauge movement, which is characterized by the following technical solutions.

[0021] Figure 4 The utility model provides a kind of control mechanism structure schematic diagram of low temperature resistant pressure gauge movement, which is characterized by the following technical solutions.

[0022] Figure 5 The utility model provides a kind of temperature sensing assembly partial sectional view structure schematic diagram of low temperature resistant pressure gauge movement.

[0023] Legend: 100, housing; 200, movement; 300, bottom cover plate; 301, groove; 400, heating wire; 500, control mechanism; 501, base; 502, temperature sensing assembly; 5021, metal pointer; 5022, barrel; 5023, rotatable rod; 5024, pin; 5025, bimetallic strip; 503, normally closed micro switch; 504, electric contact; 505, bolt. DETAILED DESCRIPTION

[0024] To make the above-mentioned purpose, features and advantages of the utility model more clearly understood, the utility model is further described below in conjunction with the drawings and examples. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0025] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can be practiced in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed in the following description.

[0026] As Figures 1-5 shown, the utility model provides a kind of low temperature resistant pressure gauge movement, including housing 100, the inside end surface of housing 100 is provided with movement 200, the rear portion of movement 200 and at the end surface of housing 100 is provided with bottom cover plate 300, the inside of bottom cover plate 300 is installed with heating wire 400 and the control mechanism 500 of the control heating wire 400 opening or closing, and control mechanism 500 includes base 501, temperature sensing assembly 502, normally closed micro switch 503 and electric contact 504;

[0027] Among them, base 501 is installed on bottom cover plate 300, temperature sensing assembly 502 includes metal pointer 5021, and electric contact 504 is connected to one end of normally closed micro switch 503;Normally closed micro switch 503 keeps closed state at normal temperature, metal pointer 5021 does not contact electric contact 504, and metal pointer 5021 rotates and realizes normally closed micro switch 503 opening with electric contact 504 at low temperature.

[0028] In this embodiment, the base 501 is fixedly connected with a bolt 505, and the base 501 is locked on the inner side of the bottom cover plate 300 through the bolt 505.

[0029] In this embodiment, the temperature sensing assembly 502 further comprises a cylinder 5022 fixedly connected with the base 501, and a rotatable rod 5023 is rotatably arranged in the cylinder 5022, the end of the rotatable rod 5023 is fixedly connected with a pin 5024, the metal pointer 5021 is installed on the pin 5024, and a bimetallic strip 5025 is sleeved on the rotatable rod 5023, the bimetallic strip 5025 drives the rotatable rod 5023 to rotate, and drives the metal pointer 5021 to rotate through the pin 5024.

[0030] In this embodiment, the bimetallic strip 5025 is of a spring type, one end of the bimetallic strip 5025 is fixedly connected with the rotatable rod 5023, and when the temperature changes, the bimetallic strip 5025 will bend due to its own characteristics, thereby driving the rotatable rod 5023 to rotate.

[0031] In this embodiment, one end of the electric heating wire 400 is connected to the positive pole of the power supply, the other end of the electric heating wire 400 is connected to the common terminal of the normally closed micro switch 503, and the other end of the normally closed micro switch 503 is connected to the negative pole of the power supply.

[0032] In this embodiment, a groove 301 is formed on the inner ring of the bottom cover plate 300, and the electric heating wire 400 is installed in the groove 301, and the groove 301 provides installation space for the electric heating wire 400.

[0033] In this embodiment, the bimetallic strip 5025 is welded or rolled by nickel-based alloy and copper which have different thermal expansion coefficients, and the temperature range detected by the bimetallic strip 5025 is-200℃ to 200℃.

[0034] In this embodiment, the power contact 504 is fixedly connected on the base 501, and the position of the power contact 504 is set according to the type of the pressure gauge, and the position of the power contact 504 is rotated according to the type of the pressure gauge, for example, the low temperature limit of the ordinary pressure gauge is usually-20℃ to-10℃, so the position of the power contact 504 should be at the position of the metal pointer 5021 rotating to more than-10℃, for example, -5℃.

[0035] The use method and working principle of the device are as follows:

[0036] When the device is in use, when the ambient temperature drops, the bimetallic strip 5025 will bend due to the difference in thermal expansion coefficient of the two metals, thereby rotating the rotatable rod 5023, and then rotating the metal pointer 5021 through the pin 5024, the metal pointer 5021 rotates towards the electrical contact 504 and contacts the electrical contact 504, the electrical contact 504 causes the normally closed micro switch 503 to open, thereby connecting the power supply of the heating wire 400, the heat generated by the heating wire 400 drives the temperature in the inner cavity of the shell 100 to rise, the movement 200 will not work at the low temperature limit, providing a good operating environment, avoiding various failures caused by low temperature;

[0037] After the heating wire 400 starts to work, heat is generated, which gradually raises the temperature in the shell, as the temperature rises, the bimetallic strip 5025 will rotate the metal pointer 5021 in the opposite direction, away from the electrical contact 504, causing the normally closed micro switch 503 to return to the closed state, the heating wire 400 stops working, avoiding unnecessary energy consumption, and preventing continuous heating from causing the movement 200 to overheat;

[0038] In summary, the opening or closing of the heating wire 400 is controlled by temperature change, the movement 200 will not work at the low temperature limit, and can be automatically disconnected after continuous heating, preventing continuous heating from causing the movement 200 to overheat, providing a good operating environment, avoiding various failures caused by low temperature or overheating affecting performance.

[0039] As described above, only the preferred embodiment of the present application is described, which is not limited in other forms, any skilled person in the art can change or modify the above disclosed technology content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification of the above embodiments without departing from the technical scheme of the present application, according to the technical essence of the present application, still belongs to the protection scope of the present application.

Claims

1. A low temperature resistant pressure gauge movement comprising a case (100), characterized in that: The internal end face of the casing (100) is provided with a movement (200), the rear of the movement (200) and the end face of the casing (100) is provided with a bottom cover plate (300), the inside of the bottom cover plate (300) is provided with an electric heating wire (400) and a control mechanism (500) for controlling the opening and closing of the electric heating wire (400), the control mechanism (500) comprises a base (501), a temperature sensing assembly (502), a normally closed micro switch (503) and an electric contact (504); The base (501) is mounted on the bottom cover plate (300), the temperature sensing assembly (502) comprises a metal pointer (5021), and the electric contact (504) is connected to one end of the normally closed micro switch (503); the normally closed micro switch (503) remains closed at normal temperature, the metal pointer (5021) does not contact the electric contact (504), and the metal pointer (5021) rotates at low temperature and realizes the opening of the normally closed micro switch (503) with the electric contact (504).

2. The low temperature resistant pressure gauge movement according to claim 1, characterized in that: The base (501) is fixedly connected with a bolt (505), and the base (501) is locked on the inner side of the bottom cover plate (300) through the bolt (505).

3. The low temperature resistant pressure gauge movement according to claim 1, characterized in that: The temperature sensing assembly (502) further comprises a cylinder (5022) fixedly connected with the base (501), a rotatable rod (5023) rotatably arranged in the cylinder (5022), a pin (5024) fixedly connected to an end of the rotatable rod (5023), the metal pointer (5021) mounted on the pin (5024), and a bimetallic strip (5025) sleeved on the rotatable rod (5023).

4. The low temperature resistant pressure gauge movement according to claim 3, characterized in that: The bimetallic strip (5025) is a spring type, and one end of the bimetallic strip (5025) is fixedly connected with the rotatable rod (5023).

5. The low temperature resistant pressure gauge movement according to claim 1, characterized in that: One end of the electric heating wire (400) is connected to the positive electrode of a power supply, the other end of the electric heating wire (400) is connected to the common terminal of the normally closed micro switch (503), and the other end of the normally closed micro switch (503) is connected to the negative electrode of the power supply.

6. The low temperature resistant pressure gauge movement according to claim 1, characterized in that: A groove (301) is formed in the inner ring of the bottom cover plate (300), and the electric heating wire (400) is mounted in the groove (301).

7. The low temperature resistant pressure gauge movement according to claim 3, characterized in that: The bimetallic strip (5025) is welded or rolled by nickel-based alloy and copper which have different thermal expansion coefficients, and the temperature range detected by the bimetallic strip (5025) is -200 DEG C to 200 DEG C.

8. The low temperature resistant pressure gauge movement according to claim 1, characterized in that: The electric contact (504) is fixedly connected to the base (501), and the position of the electric contact (504) is set according to the model of the pressure gauge.

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